4.1.1 Release

Some simple meta handlers do not go through entity rewriters, suddenly having to deal with invalid metadata because of plugins' bad concurrency handling
Closes #412

.github/ISSUE_TEMPLATE.md

@@ -1,8 +0,0 @@
-### What is the output url of /viaversion dump?
-> 
-
-### How/when does this error happen? login?:
-> 
-
-### Is there an error in the console? Use pastebin.com. Is there a kick message?:
-> 

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -0,0 +1,96 @@
+name: Bug Report
+description: Report a bug or console error
+labels: [unconfirmed]
+
+body:
+  - type: markdown
+    attributes:
+      value: "**Before reporting a bug, please see if using master/dev builds from https://ci.viaversion.com/ fixes your issue.**"
+
+  - type: input
+    attributes:
+      label: "'/viaversion dump' Output"
+      description: |
+        Run `/viaversion dump` in the console or in the chat, then copy and paste the given link here.
+      placeholder: |
+        https://dump.viaversion.com/...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Console Error
+      description: |
+        If you encounter warnings/errors in your console, **paste them with https://paste.gg/ and put the paste link here**.
+        If the error is small/less than 10 lines, you may put it directly into this field.
+      value: |
+        ```
+        Put the paste.gg link or text here.
+        ```
+      placeholder: Please do not remove the grave accents; simply replace the line of text in the middle.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Bug Description
+      description: |
+        Describe the unexpected behavior.
+        If you want to attach screenshots, use the comment field at the bottom of the page.
+      placeholder: |
+        Example: "Placing signs on 1.13.2 causes text to disappear."
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to Reproduce
+      description: |
+        List the steps on how we can reproduce the issue. Make sure we can easily understand what you mean with each step.
+      placeholder: |
+        Example:
+        1. Login with a 1.13.2 client
+        2. Place a sign
+        3. The sign text is displayed wrong
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: |
+        Describe what exactly you expected to happen.
+      placeholder: |
+        Example: "Placed sign text should not disappear."
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Additional Server Info
+      description: |
+        Do you use a proxy (eg. BungeeCord)? What software do you use and what plugins?
+      placeholder: |
+        Example: "I also use BungeeCord with the following plugins: x, y, z"
+    validations:
+      required: false
+
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Make sure you have followed each of the steps outlined here.
+      options:
+        - label: Via plugins are only running on **EITHER** the backend servers (e.g. Paper) **OR** the proxy (e.g. BungeeCord), **not on both**.
+          required: true
+        - label: I have included a ViaVersion dump.
+          required: true
+        - label: If applicable, I have included a paste (**not a screenshot**) of the error.
+          required: true
+        - label: I have tried a build from https://ci.viaversion.com/ and the issue still persists.
+          required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        ## Comments And Screenshots
+        If needed, add **screenshots to help explain your problem** in the comment field below.

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,8 @@
+blank_issues_enabled: false
+contact_links:
+  - name: Dev builds
+    url: https://ci.viaversion.com/
+    about: Before reporting a bug, please check if using master/dev builds from our ci fixes your issue.
+  - name: ViaVersion Discord
+    url: https://discord.gg/viaversion
+    about: For smaller issues or questions, you can also join our Discord server.

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,37 @@
+name: Feature Request
+description: Suggest a feature to be added
+
+body:
+  - type: textarea
+    attributes:
+      label: Problem Description
+      description: |
+        Describe the issue you are facing or why you need the feature to be added.
+      placeholder: |
+        I am always frustrated with...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Solution Description
+      description: |
+        Describe the solution you would like to see.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Alternatives
+      description: |
+        Describe alternatives you have considered.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional Info
+      description: |
+        Does the feature apply to any specific version or environment?
+    validations:
+      required: false

.github/workflows/gradle.yml

@@ -0,0 +1,25 @@
+# This workflow will build a Java project with Gradle
+# For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-gradle
+
+name: Java CI with Gradle
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
+      with:
+        distribution: 'adopt'
+        java-version: 11
+    - name: Build with Gradle
+      run: ./gradlew build
+    - uses: actions/upload-artifact@v2
+      with:
+        name: artifact
+        path: build/libs

.gitignore

@@ -1,108 +1,33 @@
-# Created by .ignore support plugin (hsz.mobi)
-### Maven template
-target/
-*/target
-pom.xml.tag
-pom.xml.releaseBackup
-pom.xml.versionsBackup
-pom.xml.next
-release.properties
-dependency-reduced-pom.xml
-buildNumber.properties
-.mvn/timing.properties
-### NetBeans template
-nbproject/private/
-build/
-nbbuild/
-dist/
-nbdist/
-nbactions.xml
-.nb-gradle/
-### Eclipse template
+### Java files ###
+*.class
 
-.metadata
-bin/
-tmp/
-*.tmp
-*.bak
-*.swp
-*~.nib
-local.properties
-.settings/
-.loadpath
-.recommenders
+# Package Files
+#*.jar
+*.war
+*.ear
 
-# Eclipse Core
-.project
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
 
-# External tool builders
-.externalToolBuilders/
 
-# Locally stored "Eclipse launch configurations"
-*.launch
 
-# PyDev specific (Python IDE for Eclipse)
-*.pydevproject
-
-# CDT-specific (C/C++ Development Tooling)
-.cproject
-
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
-
-# Java annotation processor (APT)
-.factorypath
-
-# PDT-specific (PHP Development Tools)
-.buildpath
-
-# sbteclipse plugin
-.target
-
-# Tern plugin
-.tern-project
-
-# TeXlipse plugin
-.texlipse
-
-# STS (Spring Tool Suite)
-.springBeans
-
-# Code Recommenders
-.recommenders/
-### JetBrains template
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and Webstorm
-# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
-
-# User-specific stuff:
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/dictionaries
-.idea/vcs.xml
-.idea/
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
+# Ignore project files
 *.iml
-.idea/jsLibraryMappings.xml
 
-# Sensitive or high-churn files:
-.idea/dataSources.ids
-.idea/dataSources.xml
-.idea/dataSources.local.xml
-.idea/sqlDataSources.xml
-.idea/dynamic.xml
-.idea/uiDesigner.xml
+# Ignore IDEA directory
+.idea/*
 
-# Gradle:
-.idea/gradle.xml
-.idea/libraries
+# Include the project's dictionary
+!.idea/dictionaries/
+!.idea/dictionaries/*
 
-# Mongo Explorer plugin:
-.idea/mongoSettings.xml
-
-## File-based project format:
+# File-based project format:
+*.ipr
 *.iws
 
-## Plugin-specific files:
-
+### Plugin-specific files: ###
 # IntelliJ
 /out/
 
@@ -116,18 +41,67 @@ atlassian-ide-plugin.xml
 com_crashlytics_export_strings.xml
 crashlytics.properties
 crashlytics-build.properties
-fabric.properties
-### Java template
-*.class
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
 
-# Package Files #
-*.jar
-*.war
-*.ear
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+### Eclipse ###
+*.pydevproject
+.metadata
+.gradle
+bin/
+tmp/
+*.tmp
+*.bak
+*.swp
+*~.nib
+local.properties
+.settings/
+.loadpath
 
+# Eclipse Core
+.project
+
+# External tool builders
+.externalToolBuilders/
+
+# Locally stored "Eclipse launch configurations"
+*.launch
+
+# CDT-specific
+.cproject
+
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+# PDT-specific
+.buildpath
+
+# sbteclipse plugin
+.target
+
+# TeXlipse plugin
+.texlipse
+
+
+
+### Maven ###
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+
+
+
+### NetBeans ###
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+.nb-gradle/

LICENSE

@@ -1,7 +1,674 @@
-Copyright (c) 2016 Matsv
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+                            Preamble
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
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+  The licenses for most software and other practical works are designed
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+  Nothing in this License shall be construed as excluding or limiting
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+  12. No Surrender of Others' Freedom.
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+  13. Use with the GNU Affero General Public License.
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+
+                     END OF TERMS AND CONDITIONS
+
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+
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+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
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+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
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+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,10 +1,53 @@
 # ViaBackwards
 
-Allows older Minecraft versions on a newer Minecraft server
+[![Latest Release](https://img.shields.io/github/v/release/ViaVersion/ViaBackwards)](https://github.com/ViaVersion/ViaBackwards/releases)
+[![Build Status](https://github.com/ViaVersion/ViaBackwards/actions/workflows/gradle.yml/badge.svg?branch=master)](https://github.com/ViaVersion/ViaBackwards/actions)
+[![Discord](https://img.shields.io/badge/chat-on%20discord-blue.svg)](https://viaversion.com/discord)
 
+**Allows older Minecraft client versions to connect to newer server versions**
+
+Supported Versions
+-
+**Green** = ViaVersion\
+**Purple** = ViaBackwards addition
+
+![supported_versions](https://i.imgur.com/O2KAFFL.png)
+
+Releases / Dev Builds
+-
+**Requires [ViaVersion](https://www.spigotmc.org/resources/viaversion.19254/) to be installed**
+   
+You can find the latest dev builds here:\
+**Jenkins:** https://ci.viaversion.com/view/ViaBackwards/
 
-Requires [ViaVersion](http://viaversion.com) to be installed
 **Spigot page:** https://www.spigotmc.org/resources/viabackwards.27448/
 
-### Supported versions:
-![supported_versions](http://i.imgur.com/gXCifhK.png)
+**CurseForge page:** https://www.curseforge.com/minecraft/mc-mods/viabackwards
+
+Known issues
+-
+* Custom 1.17+ min_y and height world values are not and will (most likely) never be supported => Clients older than 1.17 will not be able to see or interact with blocks below y=0 and above y=255
+* < 1.17 clients on 1.17+ servers might experience inventory desyncs on certain inventory click actions
+* Sound mappings are incomplete ([see here](https://github.com/ViaVersion/ViaBackwards/issues/326))
+
+Other Links
+-
+**Maven:** https://repo.viaversion.com
+
+**Issue tracker:** https://github.com/ViaVersion/ViaBackwards/issues
+
+**List of contributors:** https://github.com/ViaVersion/ViaBackwards/graphs/contributors
+
+License
+-
+This project is licensed under the [GNU General Public License](LICENSE).
+
+Special Thanks
+-
+![https://www.yourkit.com/](https://www.yourkit.com/images/yklogo.png)
+
+[YourKit](https://www.yourkit.com/) supports open source projects with innovative and intelligent tools
+for monitoring and profiling Java and .NET applications.
+YourKit is the creator of [YourKit Java Profiler](https://www.yourkit.com/java/profiler/),
+[YourKit .NET Profiler](https://www.yourkit.com/.net/profiler/),
+and [YourKit YouMonitor](https://www.yourkit.com/youmonitor/).

all/pom.xml

@@ -1,85 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-all</artifactId>
-
-    <build>
-        <finalName>${project.name}-${project.version}</finalName>
-        <defaultGoal>clean install</defaultGoal>
-
-        <plugins>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.3</version>
-                <configuration>
-                    <source>1.8</source>
-                    <target>1.8</target>
-                    <showWarnings>false</showWarnings>
-                    <showDeprecation>false</showDeprecation>
-                </configuration>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-shade-plugin</artifactId>
-                <version>2.4.3</version>
-                <configuration>
-                    <createDependencyReducedPom>false</createDependencyReducedPom>
-                    <minimizeJar>false</minimizeJar>
-                </configuration>
-                <executions>
-                    <execution>
-                        <phase>package</phase>
-                        <goals>
-                            <goal>shade</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-        </plugins>
-    </build>
-
-    <dependencies>
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-bukkit</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-bungee</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-sponge</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-</project>

build-logic/build.gradle.kts

@@ -0,0 +1,12 @@
+plugins {
+    `kotlin-dsl`
+}
+
+repositories {
+    gradlePluginPortal()
+}
+
+dependencies {
+    // version must be manually kept in sync with the one in root project settings.gradle.kts
+    implementation("gradle.plugin.com.github.johnrengelman", "shadow", "7.1.0")
+}

build-logic/src/main/kotlin/extensions.kt

@@ -0,0 +1,44 @@
+import org.gradle.api.JavaVersion
+import org.gradle.api.Project
+import org.gradle.api.plugins.JavaPluginExtension
+import org.gradle.api.publish.PublishingExtension
+import org.gradle.api.publish.maven.MavenPublication
+import org.gradle.kotlin.dsl.configure
+import org.gradle.kotlin.dsl.get
+import org.gradle.kotlin.dsl.named
+import java.io.ByteArrayOutputStream
+
+fun Project.publishShadowJar() {
+    configurePublication {
+        artifact(tasks["shadowJar"])
+        artifact(tasks["sourcesJar"])
+    }
+}
+
+fun Project.publishJavaComponents() {
+    configurePublication {
+        from(components["java"])
+    }
+}
+
+private fun Project.configurePublication(configurer: MavenPublication.() -> Unit) {
+    extensions.configure<PublishingExtension> {
+        publications.named<MavenPublication>("mavenJava") {
+            apply(configurer)
+        }
+    }
+}
+
+fun Project.latestCommitHash(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "rev-parse", "--short", "HEAD")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun JavaPluginExtension.javaTarget(version: Int) {
+    sourceCompatibility = JavaVersion.toVersion(version)
+    targetCompatibility = JavaVersion.toVersion(version)
+}

build-logic/src/main/kotlin/vb.base-conventions.gradle.kts

@@ -0,0 +1,42 @@
+plugins {
+    `java-library`
+    `maven-publish`
+}
+
+tasks {
+    // Variable replacements
+    processResources {
+        filesMatching(listOf("plugin.yml", "mcmod.info", "fabric.mod.json", "bungee.yml")) {
+            expand("version" to project.version, "description" to project.description, "url" to "https://github.com/ViaVersion/ViaBackwards")
+        }
+    }
+    javadoc {
+        options.encoding = Charsets.UTF_8.name()
+        (options as StandardJavadocDocletOptions).addStringOption("Xdoclint:none", "-quiet")
+    }
+    compileJava {
+        options.encoding = Charsets.UTF_8.name()
+        options.compilerArgs.addAll(listOf("-nowarn", "-Xlint:-unchecked", "-Xlint:-deprecation"))
+    }
+}
+
+java {
+    javaTarget(8)
+    withSourcesJar()
+}
+
+publishing {
+    publications.create<MavenPublication>("mavenJava") {
+        groupId = rootProject.group as String
+        artifactId = project.name
+        version = rootProject.version as String
+    }
+    repositories.maven {
+        name = "Via"
+        url = uri("https://repo.viaversion.com/")
+        credentials(PasswordCredentials::class)
+        authentication {
+            create<BasicAuthentication>("basic")
+        }
+    }
+}

build-logic/src/main/kotlin/vb.platform-conventions.gradle.kts

@@ -0,0 +1,10 @@
+plugins {
+    id("vb.shadow-conventions")
+}
+
+tasks {
+    shadowJar {
+        archiveFileName.set("ViaBackwards-${project.name.substringAfter("viabackwards-").capitalize()}-${project.version}.jar")
+        destinationDirectory.set(rootProject.layout.buildDirectory.dir("libs"))
+    }
+}

build-logic/src/main/kotlin/vb.shadow-conventions.gradle.kts

@@ -0,0 +1,29 @@
+import com.github.jengelman.gradle.plugins.shadow.tasks.ShadowJar
+import org.gradle.jvm.tasks.Jar
+import org.gradle.kotlin.dsl.named
+
+plugins {
+    id("vb.base-conventions")
+    id("com.github.johnrengelman.shadow")
+}
+
+tasks {
+    named<Jar>("jar") {
+        archiveClassifier.set("unshaded")
+        from(project.rootProject.file("LICENSE"))
+    }
+    val shadowJar = named<ShadowJar>("shadowJar") {
+        archiveClassifier.set("")
+        configureRelocations()
+    }
+    named("build") {
+        dependsOn(shadowJar)
+    }
+}
+
+publishShadowJar()
+
+fun ShadowJar.configureRelocations() {
+    relocate("com.google.gson", "com.viaversion.viaversion.libs.gson")
+    relocate("it.unimi.dsi.fastutil", "com.viaversion.viaversion.libs.fastutil")
+}

build-logic/src/main/kotlin/vb.standard-conventions.gradle.kts

@@ -0,0 +1,5 @@
+plugins {
+    id("vb.base-conventions")
+}
+
+publishJavaComponents()

build.gradle.kts

@@ -0,0 +1,31 @@
+plugins {
+    base
+    id("vb.build-logic")
+}
+
+allprojects {
+    group = "com.viaversion"
+    version = "4.1.1"
+    description = "Allow older clients to join newer server versions."
+}
+
+val platforms = setOf(
+        projects.viabackwardsBukkit,
+        projects.viabackwardsBungee,
+        projects.viabackwardsFabric,
+        projects.viabackwardsSponge,
+        projects.viabackwardsVelocity
+).map { it.dependencyProject }
+
+// Would otherwise contain api/depdency modules if at some point needed
+val special = setOf(
+        projects.viabackwards
+).map { it.dependencyProject }
+
+subprojects {
+    when (this) {
+        in platforms -> plugins.apply("vb.platform-conventions")
+        in special -> plugins.apply("vb.base-conventions")
+        else -> plugins.apply("vb.standard-conventions")
+    }
+}

bukkit/build.gradle.kts

@@ -0,0 +1,7 @@
+dependencies {
+    implementation(projects.viabackwardsCommon)
+    compileOnly(libs.paper) {
+        exclude("com.google.code.gson", "gson")
+        exclude("javax.persistence", "persistence-api")
+    }
+}

bukkit/pom.xml

@@ -1,57 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-bukkit</artifactId>
-
-    <repositories>
-        <repository>
-            <id>spigot-repo</id>
-            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <dependency>
-            <groupId>org.spigotmc</groupId>
-            <artifactId>spigot-api</artifactId>
-            <version>1.11-R0.1-SNAPSHOT</version>
-            <scope>provided</scope>
-        </dependency>
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <resources>
-            <resource>
-                <targetPath>.</targetPath>
-                <filtering>true</filtering>
-                <directory>src/main/resources/</directory>
-                <includes>
-                    <include>*</include>
-                </includes>
-            </resource>
-        </resources>
-    </build>
-</project>

bukkit/src/main/java/com/viaversion/viabackwards/BukkitPlugin.java

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards;
+
+import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
+import com.viaversion.viabackwards.listener.FireDamageListener;
+import com.viaversion.viabackwards.listener.FireExtinguishListener;
+import com.viaversion.viabackwards.listener.LecternInteractListener;
+import com.viaversion.viaversion.ViaVersionPlugin;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import com.viaversion.viaversion.bukkit.platform.BukkitViaLoader;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
+
+    @Override
+    public void onLoad() {
+        if (!ViaVersionPlugin.getInstance().isLateBind()) {
+            init();
+        }
+    }
+
+    @Override
+    public void onEnable() {
+        if (ViaVersionPlugin.getInstance().isLateBind()) {
+            init();
+        }
+    }
+
+    private void init() {
+        init(getDataFolder());
+        Via.getPlatform().runSync(this::onServerLoaded);
+    }
+
+    private void onServerLoaded() {
+        BukkitViaLoader loader = (BukkitViaLoader) Via.getManager().getLoader();
+        int protocolVersion = Via.getAPI().getServerVersion().highestSupportedVersion();
+        if (protocolVersion >= ProtocolVersion.v1_16.getVersion()) {
+            loader.storeListener(new FireExtinguishListener(this)).register();
+        }
+        if (protocolVersion >= ProtocolVersion.v1_14.getVersion()) {
+            loader.storeListener(new LecternInteractListener(this)).register();
+        }
+        if (protocolVersion >= ProtocolVersion.v1_12.getVersion()) {
+            loader.storeListener(new FireDamageListener(this)).register();
+        }
+    }
+
+    @Override
+    public void disable() {
+        getPluginLoader().disablePlugin(this);
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/FireDamageListener.java

@@ -0,0 +1,54 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Sound;
+import org.bukkit.SoundCategory;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.entity.EntityDamageEvent;
+
+public class FireDamageListener extends ViaBukkitListener {
+
+    public FireDamageListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_11_1To1_12.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onFireDamage(EntityDamageEvent event) {
+        if (event.getEntityType() != EntityType.PLAYER) return;
+
+        EntityDamageEvent.DamageCause cause = event.getCause();
+        if (cause != EntityDamageEvent.DamageCause.FIRE
+                && cause != EntityDamageEvent.DamageCause.FIRE_TICK
+                && cause != EntityDamageEvent.DamageCause.LAVA
+                && cause != EntityDamageEvent.DamageCause.DROWNING) {
+            return;
+        }
+
+        Player player = (Player) event.getEntity();
+        if (isOnPipe(player)) {
+            player.playSound(player.getLocation(), Sound.ENTITY_PLAYER_HURT, SoundCategory.PLAYERS, 1, 1);
+        }
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/FireExtinguishListener.java

@@ -0,0 +1,53 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.protocol1_15_2to1_16.Protocol1_15_2To1_16;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.block.Action;
+import org.bukkit.event.player.PlayerInteractEvent;
+
+public class FireExtinguishListener extends ViaBukkitListener {
+
+    public FireExtinguishListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_15_2To1_16.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onFireExtinguish(PlayerInteractEvent event) {
+        if (event.getAction() != Action.LEFT_CLICK_BLOCK) return;
+
+        Block block = event.getClickedBlock();
+        if (block == null) return;
+
+        Player player = event.getPlayer();
+        if (!isOnPipe(player)) return;
+
+        Block relative = block.getRelative(event.getBlockFace());
+        if (relative.getType() == Material.FIRE) {
+            event.setCancelled(true);
+            relative.setType(Material.AIR);
+        }
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/listener/LecternInteractListener.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.listener;
+
+import com.viaversion.viabackwards.BukkitPlugin;
+import com.viaversion.viabackwards.protocol.protocol1_13_2to1_14.Protocol1_13_2To1_14;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.Material;
+import org.bukkit.block.Block;
+import org.bukkit.block.Lectern;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerInteractEvent;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.BookMeta;
+
+public class LecternInteractListener extends ViaBukkitListener {
+
+    public LecternInteractListener(BukkitPlugin plugin) {
+        super(plugin, Protocol1_13_2To1_14.class);
+    }
+
+    @EventHandler(priority = EventPriority.HIGHEST, ignoreCancelled = true)
+    public void onLecternInteract(PlayerInteractEvent event) {
+        Block block = event.getClickedBlock();
+        if (block == null || block.getType() != Material.LECTERN) return;
+
+        Player player = event.getPlayer();
+        if (!isOnPipe(player)) return;
+
+        Lectern lectern = (Lectern) block.getState();
+        ItemStack book = lectern.getInventory().getItem(0);
+        if (book == null) return;
+
+        BookMeta meta = (BookMeta) book.getItemMeta();
+
+        // Open a book with the text of the lectern's writable book
+        ItemStack newBook = new ItemStack(Material.WRITTEN_BOOK);
+        BookMeta newBookMeta = (BookMeta) newBook.getItemMeta();
+        newBookMeta.setPages(meta.getPages());
+        newBookMeta.setAuthor("an upsidedown person");
+        newBookMeta.setTitle("buk");
+        newBook.setItemMeta(newBookMeta);
+        player.openBook(newBook);
+
+        event.setCancelled(true);
+    }
+}

bukkit/src/main/java/nl/matsv/viabackwards/BukkitPlugin.java

@@ -1,26 +0,0 @@
-/*
- * Copyright (c) 2016 Matsv
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-package nl.matsv.viabackwards;
-
-import nl.matsv.viabackwards.api.ViaBackwardsPlatform;
-import org.bukkit.plugin.java.JavaPlugin;
-
-public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
-    @Override
-    public void onEnable() {
-        this.init();
-    }
-
-    @Override
-    public void disable() {
-        getPluginLoader().disablePlugin(this);
-    }
-}

bukkit/src/main/resources/plugin.yml

@@ -1,10 +1,10 @@
 name: ViaBackwards
-version: ${project.version}
-description: Allows 1.9.x on a 1.10 Spigot server
-main: nl.matsv.viabackwards.BukkitPlugin
+version: ${version}
+description: Allow older Minecraft versions to connect to a newer server version.
+main: com.viaversion.viabackwards.BukkitPlugin
+api-version: 1.13
 
-authors: [Matsv]
-website: https://matsv.nl
+authors: [Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1]
+website: ${url}
 
-load: STARTUP
 depend: [ViaVersion]

bungee/build.gradle.kts

@@ -0,0 +1,4 @@
+dependencies {
+    implementation(projects.viabackwardsCommon)
+    compileOnly(libs.bungee)
+}

bungee/pom.xml

@@ -1,61 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!--
-  ~ Copyright (c) 2016 Matsv
-  ~
-  ~ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
-  ~
-  ~ The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
-  ~
-  ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-  -->
-
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <parent>
-        <artifactId>viabackwards-parent</artifactId>
-        <groupId>nl.matsv</groupId>
-        <version>2.1</version>
-    </parent>
-    <modelVersion>4.0.0</modelVersion>
-
-    <artifactId>viabackwards-bungee</artifactId>
-
-    <repositories>
-        <!-- Bungee repo -->
-        <repository>
-            <id>bungeecord-repo</id>
-            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
-        </repository>
-    </repositories>
-
-    <dependencies>
-        <!-- BungeeCord API -->
-        <dependency>
-            <groupId>net.md-5</groupId>
-            <artifactId>bungeecord-api</artifactId>
-            <version>1.11-SNAPSHOT</version>
-            <scope>provided</scope>
-        </dependency>
-
-        <!-- Core Module -->
-        <dependency>
-            <groupId>nl.matsv</groupId>
-            <artifactId>viabackwards-core</artifactId>
-            <version>${project.parent.version}</version>
-        </dependency>
-    </dependencies>
-
-    <build>
-        <resources>
-            <resource>
-                <targetPath>.</targetPath>
-                <filtering>true</filtering>
-                <directory>src/main/resources/</directory>
-                <includes>
-                    <include>*</include>
-                </includes>
-            </resource>
-        </resources>
-    </build>
-</project>

bungee/src/main/java/com/viaversion/viabackwards/BungeePlugin.java

@@ -0,0 +1,35 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards;
+
+import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
+import com.viaversion.viaversion.api.Via;
+import net.md_5.bungee.api.plugin.Plugin;
+
+public class BungeePlugin extends Plugin implements ViaBackwardsPlatform {
+
+    @Override
+    public void onLoad() {
+        Via.getManager().addEnableListener(() -> this.init(getDataFolder()));
+    }
+
+    @Override
+    public void disable() {
+    }
+}

bungee/src/main/java/nl/matsv/viabackwards/BungeePlugin.java

@@ -1,27 +0,0 @@
-/*
- * Copyright (c) 2016 Matsv
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-package nl.matsv.viabackwards;
-
-import net.md_5.bungee.api.plugin.Plugin;
-import nl.matsv.viabackwards.api.ViaBackwardsPlatform;
-
-public class BungeePlugin extends Plugin implements ViaBackwardsPlatform {
-
-    @Override
-    public void onEnable() {
-        this.init();
-    }
-
-    // Why is this not a thing in Bungee? O_o
-    @Override
-    public void disable() {
-    }
-}

bungee/src/main/resources/bungee.yml

@@ -1,5 +1,5 @@
 name: ViaBackwards
-main: nl.matsv.viabackwards.BungeePlugin
-author: Matsv
-version: ${project.version}
+main: com.viaversion.viabackwards.BungeePlugin
+author: "Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1"
+version: ${version}
 depends: [ViaVersion]

common/build.gradle.kts

@@ -0,0 +1,19 @@
+plugins {
+    id("net.kyori.blossom")
+}
+
+blossom {
+    replaceToken("\$VERSION", project.version)
+    replaceToken("\$IMPL_VERSION", "git-ViaBackwards-${project.version}:${rootProject.latestCommitHash()}")
+}
+
+dependencies {
+    compileOnlyApi(libs.viaver)
+    compileOnlyApi(libs.netty)
+    compileOnlyApi(libs.guava)
+    compileOnlyApi(libs.checkerQual)
+}
+
+java {
+    withJavadocJar()
+}

common/src/main/java/com/viaversion/viabackwards/ViaBackwards.java

@@ -0,0 +1,44 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.api.ViaBackwardsConfig;
+import com.viaversion.viabackwards.api.ViaBackwardsPlatform;
+
+public class ViaBackwards {
+
+    private static ViaBackwardsPlatform platform;
+    private static ViaBackwardsConfig config;
+
+    public static void init(ViaBackwardsPlatform platform, ViaBackwardsConfig config) {
+        Preconditions.checkArgument(platform != null, "ViaBackwards is already initialized");
+
+        ViaBackwards.platform = platform;
+        ViaBackwards.config = config;
+    }
+
+    public static ViaBackwardsPlatform getPlatform() {
+        return platform;
+    }
+
+    public static ViaBackwardsConfig getConfig() {
+        return config;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/ViaBackwardsConfig.java

@@ -0,0 +1,99 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards;
+
+import com.viaversion.viaversion.util.Config;
+
+import java.io.File;
+import java.net.URL;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+public class ViaBackwardsConfig extends Config implements com.viaversion.viabackwards.api.ViaBackwardsConfig {
+
+    private boolean addCustomEnchantsToLore;
+    private boolean addTeamColorToPrefix;
+    private boolean fix1_13FacePlayer;
+    private boolean alwaysShowOriginalMobName;
+    private boolean fix1_13FormattedInventoryTitles;
+    private boolean handlePingsAsInvAcknowledgements;
+
+    public ViaBackwardsConfig(File configFile) {
+        super(configFile);
+    }
+
+    @Override
+    public void reloadConfig() {
+        super.reloadConfig();
+        loadFields();
+    }
+
+    private void loadFields() {
+        addCustomEnchantsToLore = getBoolean("add-custom-enchants-into-lore", true);
+        addTeamColorToPrefix = getBoolean("add-teamcolor-to-prefix", true);
+        fix1_13FacePlayer = getBoolean("fix-1_13-face-player", false);
+        fix1_13FormattedInventoryTitles = getBoolean("fix-formatted-inventory-titles", true);
+        alwaysShowOriginalMobName = getBoolean("always-show-original-mob-name", true);
+        handlePingsAsInvAcknowledgements = getBoolean("handle-pings-as-inv-acknowledgements", false);
+    }
+
+    @Override
+    public boolean addCustomEnchantsToLore() {
+        return addCustomEnchantsToLore;
+    }
+
+    @Override
+    public boolean addTeamColorTo1_13Prefix() {
+        return addTeamColorToPrefix;
+    }
+
+    @Override
+    public boolean isFix1_13FacePlayer() {
+        return fix1_13FacePlayer;
+    }
+
+    @Override
+    public boolean fix1_13FormattedInventoryTitle() {
+        return fix1_13FormattedInventoryTitles;
+    }
+
+    @Override
+    public boolean alwaysShowOriginalMobName() {
+        return alwaysShowOriginalMobName;
+    }
+
+    @Override
+    public boolean handlePingsAsInvAcknowledgements() {
+        return handlePingsAsInvAcknowledgements || Boolean.getBoolean("com.viaversion.handlePingsAsInvAcknowledgements");
+    }
+
+    @Override
+    public URL getDefaultConfigURL() {
+        return getClass().getClassLoader().getResource("assets/viabackwards/config.yml");
+    }
+
+    @Override
+    protected void handleConfig(Map<String, Object> map) {
+    }
+
+    @Override
+    public List<String> getUnsupportedOptions() {
+        return Collections.emptyList();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/BackwardsProtocol.java

@@ -0,0 +1,61 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api;
+
+import com.viaversion.viabackwards.api.data.BackwardsMappings;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.AbstractProtocol;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class BackwardsProtocol<C1 extends ClientboundPacketType, C2 extends ClientboundPacketType, S1 extends ServerboundPacketType, S2 extends ServerboundPacketType>
+        extends AbstractProtocol<C1, C2, S1, S2> {
+
+    protected BackwardsProtocol() {
+    }
+
+    protected BackwardsProtocol(@Nullable Class<C1> oldClientboundPacketEnum, @Nullable Class<C2> clientboundPacketEnum,
+                                @Nullable Class<S1> oldServerboundPacketEnum, @Nullable Class<S2> serverboundPacketEnum) {
+        super(oldClientboundPacketEnum, clientboundPacketEnum, oldServerboundPacketEnum, serverboundPacketEnum);
+    }
+
+    /**
+     * Waits for the given protocol to be loaded to then asynchronously execute the runnable for this protocol.
+     */
+    protected void executeAsyncAfterLoaded(Class<? extends Protocol> protocolClass, Runnable runnable) {
+        Via.getManager().getProtocolManager().addMappingLoaderFuture(getClass(), protocolClass, runnable);
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        // Manually load them later, since they depend on VV's mappings
+        return false;
+    }
+
+    @Override
+    public @Nullable BackwardsMappings getMappingData() { // Change return type to BackwardsMappings
+        return null;
+    }
+
+    public @Nullable TranslatableRewriter getTranslatableRewriter() {
+        return null;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsConfig.java

@@ -0,0 +1,53 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api;
+
+public interface ViaBackwardsConfig {
+
+    /**
+     * Mimics name and level of a custom enchant through the item's lore.
+     *
+     * @return true if enabled
+     */
+    boolean addCustomEnchantsToLore();
+
+    /**
+     * Writes the color of the scoreboard team after the prefix.
+     *
+     * @return true if enabled
+     */
+    boolean addTeamColorTo1_13Prefix();
+
+    /**
+     * Converts the new 1.13 face player packets to look packets.
+     *
+     * @return true if enabled
+     */
+    boolean isFix1_13FacePlayer();
+
+    boolean fix1_13FormattedInventoryTitle();
+
+    /**
+     * Always shows the original mob's name instead of only when hovering over them with the cursor.
+     *
+     * @return true if enabled
+     */
+    boolean alwaysShowOriginalMobName();
+
+    boolean handlePingsAsInvAcknowledgements();
+}

common/src/main/java/com/viaversion/viabackwards/api/ViaBackwardsPlatform.java

@@ -0,0 +1,148 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.ViaBackwardsConfig;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.Protocol1_10To1_11;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.Protocol1_11To1_11_1;
+import com.viaversion.viabackwards.protocol.protocol1_12_1to1_12_2.Protocol1_12_1To1_12_2;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12to1_12_1.Protocol1_12To1_12_1;
+import com.viaversion.viabackwards.protocol.protocol1_13_1to1_13_2.Protocol1_13_1To1_13_2;
+import com.viaversion.viabackwards.protocol.protocol1_13_2to1_14.Protocol1_13_2To1_14;
+import com.viaversion.viabackwards.protocol.protocol1_13to1_13_1.Protocol1_13To1_13_1;
+import com.viaversion.viabackwards.protocol.protocol1_14_1to1_14_2.Protocol1_14_1To1_14_2;
+import com.viaversion.viabackwards.protocol.protocol1_14_2to1_14_3.Protocol1_14_2To1_14_3;
+import com.viaversion.viabackwards.protocol.protocol1_14_3to1_14_4.Protocol1_14_3To1_14_4;
+import com.viaversion.viabackwards.protocol.protocol1_14_4to1_15.Protocol1_14_4To1_15;
+import com.viaversion.viabackwards.protocol.protocol1_14to1_14_1.Protocol1_14To1_14_1;
+import com.viaversion.viabackwards.protocol.protocol1_15_1to1_15_2.Protocol1_15_1To1_15_2;
+import com.viaversion.viabackwards.protocol.protocol1_15_2to1_16.Protocol1_15_2To1_16;
+import com.viaversion.viabackwards.protocol.protocol1_15to1_15_1.Protocol1_15To1_15_1;
+import com.viaversion.viabackwards.protocol.protocol1_16_1to1_16_2.Protocol1_16_1To1_16_2;
+import com.viaversion.viabackwards.protocol.protocol1_16_2to1_16_3.Protocol1_16_2To1_16_3;
+import com.viaversion.viabackwards.protocol.protocol1_16_3to1_16_4.Protocol1_16_3To1_16_4;
+import com.viaversion.viabackwards.protocol.protocol1_16_4to1_17.Protocol1_16_4To1_17;
+import com.viaversion.viabackwards.protocol.protocol1_16to1_16_1.Protocol1_16To1_16_1;
+import com.viaversion.viabackwards.protocol.protocol1_17_1to1_18.Protocol1_17_1To1_18;
+import com.viaversion.viabackwards.protocol.protocol1_17to1_17_1.Protocol1_17To1_17_1;
+import com.viaversion.viabackwards.protocol.protocol1_9_4to1_10.Protocol1_9_4To1_10;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.ProtocolManager;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import com.viaversion.viaversion.update.Version;
+
+import java.io.File;
+import java.util.logging.Logger;
+
+public interface ViaBackwardsPlatform {
+
+    String MINIMUM_VV_VERSION = "4.1.1";
+    String IMPL_VERSION = "$IMPL_VERSION";
+
+    /**
+     * Initialize ViaBackwards.
+     */
+    default void init(File dataFolder) {
+        ViaBackwardsConfig config = new ViaBackwardsConfig(new File(dataFolder, "config.yml"));
+        config.reloadConfig();
+
+        ViaBackwards.init(this, config);
+
+        if (isOutdated()) return;
+
+        Via.getManager().getSubPlatforms().add(IMPL_VERSION);
+
+        getLogger().info("Loading translations...");
+        TranslatableRewriter.loadTranslatables();
+
+        ProtocolManager protocolManager = Via.getManager().getProtocolManager();
+        protocolManager.registerProtocol(new Protocol1_9_4To1_10(), ProtocolVersion.v1_9_3, ProtocolVersion.v1_10);
+
+        protocolManager.registerProtocol(new Protocol1_10To1_11(), ProtocolVersion.v1_10, ProtocolVersion.v1_11);
+        protocolManager.registerProtocol(new Protocol1_11To1_11_1(), ProtocolVersion.v1_11, ProtocolVersion.v1_11_1);
+
+        protocolManager.registerProtocol(new Protocol1_11_1To1_12(), ProtocolVersion.v1_11_1, ProtocolVersion.v1_12);
+        protocolManager.registerProtocol(new Protocol1_12To1_12_1(), ProtocolVersion.v1_12, ProtocolVersion.v1_12_1);
+        protocolManager.registerProtocol(new Protocol1_12_1To1_12_2(), ProtocolVersion.v1_12_1, ProtocolVersion.v1_12_2);
+
+        protocolManager.registerProtocol(new Protocol1_12_2To1_13(), ProtocolVersion.v1_12_2, ProtocolVersion.v1_13);
+        protocolManager.registerProtocol(new Protocol1_13To1_13_1(), ProtocolVersion.v1_13, ProtocolVersion.v1_13_1);
+        protocolManager.registerProtocol(new Protocol1_13_1To1_13_2(), ProtocolVersion.v1_13_1, ProtocolVersion.v1_13_2);
+
+        protocolManager.registerProtocol(new Protocol1_13_2To1_14(), ProtocolVersion.v1_13_2, ProtocolVersion.v1_14);
+        protocolManager.registerProtocol(new Protocol1_14To1_14_1(), ProtocolVersion.v1_14, ProtocolVersion.v1_14_1);
+        protocolManager.registerProtocol(new Protocol1_14_1To1_14_2(), ProtocolVersion.v1_14_1, ProtocolVersion.v1_14_2);
+        protocolManager.registerProtocol(new Protocol1_14_2To1_14_3(), ProtocolVersion.v1_14_2, ProtocolVersion.v1_14_3);
+        protocolManager.registerProtocol(new Protocol1_14_3To1_14_4(), ProtocolVersion.v1_14_3, ProtocolVersion.v1_14_4);
+
+        protocolManager.registerProtocol(new Protocol1_14_4To1_15(), ProtocolVersion.v1_14_4, ProtocolVersion.v1_15);
+        protocolManager.registerProtocol(new Protocol1_15To1_15_1(), ProtocolVersion.v1_15, ProtocolVersion.v1_15_1);
+        protocolManager.registerProtocol(new Protocol1_15_1To1_15_2(), ProtocolVersion.v1_15_1, ProtocolVersion.v1_15_2);
+
+        protocolManager.registerProtocol(new Protocol1_15_2To1_16(), ProtocolVersion.v1_15_2, ProtocolVersion.v1_16);
+        protocolManager.registerProtocol(new Protocol1_16To1_16_1(), ProtocolVersion.v1_16, ProtocolVersion.v1_16_1);
+        protocolManager.registerProtocol(new Protocol1_16_1To1_16_2(), ProtocolVersion.v1_16_1, ProtocolVersion.v1_16_2);
+        protocolManager.registerProtocol(new Protocol1_16_2To1_16_3(), ProtocolVersion.v1_16_2, ProtocolVersion.v1_16_3);
+        protocolManager.registerProtocol(new Protocol1_16_3To1_16_4(), ProtocolVersion.v1_16_3, ProtocolVersion.v1_16_4);
+
+        protocolManager.registerProtocol(new Protocol1_16_4To1_17(), ProtocolVersion.v1_16_4, ProtocolVersion.v1_17);
+        protocolManager.registerProtocol(new Protocol1_17To1_17_1(), ProtocolVersion.v1_17, ProtocolVersion.v1_17_1);
+        protocolManager.registerProtocol(new Protocol1_17_1To1_18(), ProtocolVersion.v1_17_1, ProtocolVersion.v1_18);
+    }
+
+    /**
+     * Logger provided by the platform.
+     *
+     * @return logger instance
+     */
+    Logger getLogger();
+
+    default boolean isOutdated() {
+        String vvVersion = Via.getPlatform().getPluginVersion();
+        if (vvVersion != null && new Version(vvVersion).compareTo(new Version(MINIMUM_VV_VERSION + "--")) < 0) {
+            getLogger().severe("================================");
+            getLogger().severe("YOUR VIAVERSION IS OUTDATED");
+            getLogger().severe("PLEASE USE VIAVERSION " + MINIMUM_VV_VERSION + " OR NEWER");
+            getLogger().severe("LINK: https://ci.viaversion.com/");
+            getLogger().severe("VIABACKWARDS WILL NOW DISABLE");
+            getLogger().severe("================================");
+
+            disable();
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Disable the plugin.
+     */
+    void disable();
+
+    /**
+     * Returns ViaBackwards's data folder.
+     *
+     * @return data folder
+     */
+    File getDataFolder();
+}

common/src/main/java/com/viaversion/viabackwards/api/data/BackwardsMappings.java

@@ -0,0 +1,167 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.MappingDataBase;
+import com.viaversion.viaversion.api.data.Mappings;
+import com.viaversion.viaversion.api.protocol.Protocol;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.Map;
+import java.util.logging.Logger;
+
+public class BackwardsMappings extends MappingDataBase {
+
+    private final Class<? extends Protocol> vvProtocolClass;
+    private Int2ObjectMap<MappedItem> backwardsItemMappings;
+    private Map<String, String> backwardsSoundMappings;
+    private Map<String, String> entityNames;
+
+    public BackwardsMappings(String oldVersion, String newVersion, @Nullable Class<? extends Protocol> vvProtocolClass) {
+        this(oldVersion, newVersion, vvProtocolClass, false);
+    }
+
+    public BackwardsMappings(String oldVersion, String newVersion, @Nullable Class<? extends Protocol> vvProtocolClass, boolean hasDiffFile) {
+        super(oldVersion, newVersion, hasDiffFile);
+        Preconditions.checkArgument(vvProtocolClass == null || !vvProtocolClass.isAssignableFrom(BackwardsProtocol.class));
+        this.vvProtocolClass = vvProtocolClass;
+        // Just re-use ViaVersion's item id map
+        loadItems = false;
+    }
+
+    @Override
+    protected void loadExtras(JsonObject oldMappings, JsonObject newMappings, @Nullable JsonObject diffMappings) {
+        if (diffMappings != null) {
+            JsonObject diffItems = diffMappings.getAsJsonObject("items");
+            if (diffItems != null) {
+                backwardsItemMappings = VBMappingDataLoader.loadItemMappings(oldMappings.getAsJsonObject("items"),
+                        newMappings.getAsJsonObject("items"), diffItems, shouldWarnOnMissing("items"));
+            }
+
+            JsonObject diffSounds = diffMappings.getAsJsonObject("sounds");
+            if (diffSounds != null) {
+                backwardsSoundMappings = VBMappingDataLoader.objectToNamespacedMap(diffSounds);
+            }
+
+            JsonObject diffEntityNames = diffMappings.getAsJsonObject("entitynames");
+            if (diffEntityNames != null) {
+                entityNames = VBMappingDataLoader.objectToMap(diffEntityNames);
+            }
+        }
+
+        // Just re-use ViaVersion's item id map
+        if (vvProtocolClass != null) {
+            itemMappings = Via.getManager().getProtocolManager().getProtocol(vvProtocolClass).getMappingData().getItemMappings().inverse();
+        }
+
+        loadVBExtras(oldMappings, newMappings);
+    }
+
+    @Override
+    protected @Nullable Mappings loadFromArray(JsonObject oldMappings, JsonObject newMappings, @Nullable JsonObject diffMappings, String key) {
+        if (!oldMappings.has(key) || !newMappings.has(key)) return null;
+
+        JsonObject diff = diffMappings != null ? diffMappings.getAsJsonObject(key) : null;
+        return VBMappings.vbBuilder().unmapped(oldMappings.getAsJsonArray(key)).mapped(newMappings.getAsJsonArray(key))
+                .diffMappings(diff).warnOnMissing(shouldWarnOnMissing(key)).build();
+    }
+
+    @Override
+    protected @Nullable Mappings loadFromObject(JsonObject oldMappings, JsonObject newMappings, @Nullable JsonObject diffMappings, String key) {
+        if (!oldMappings.has(key) || !newMappings.has(key)) return null;
+
+        JsonObject diff = diffMappings != null ? diffMappings.getAsJsonObject(key) : null;
+        return VBMappings.vbBuilder().unmapped(oldMappings.getAsJsonObject(key)).mapped(newMappings.getAsJsonObject(key))
+                .diffMappings(diff).warnOnMissing(shouldWarnOnMissing(key)).build();
+    }
+
+    @Override
+    protected JsonObject loadDiffFile() {
+        return VBMappingDataLoader.loadFromDataDir("mapping-" + newVersion + "to" + oldVersion + ".json");
+    }
+
+    /**
+     * To be overridden.
+     */
+    protected void loadVBExtras(JsonObject oldMappings, JsonObject newMappings) {
+    }
+
+    protected boolean shouldWarnOnMissing(String key) {
+        return !key.equals("blocks") && !key.equals("statistics");
+    }
+
+    @Override
+    protected Logger getLogger() {
+        return ViaBackwards.getPlatform().getLogger();
+    }
+
+    /**
+     * @see #getMappedItem(int) for custom backwards mappings
+     */
+    @Override
+    public int getNewItemId(int id) {
+        // Don't warn on missing here
+        return this.itemMappings.get(id);
+    }
+
+    @Override
+    public int getNewBlockId(int id) {
+        // Don't warn on missing here
+        return this.blockMappings.getNewId(id);
+    }
+
+    @Override
+    public int getOldItemId(final int id) {
+        // Warn on missing
+        return checkValidity(id, this.itemMappings.inverse().get(id), "item");
+    }
+
+    public @Nullable MappedItem getMappedItem(int id) {
+        return backwardsItemMappings != null ? backwardsItemMappings.get(id) : null;
+    }
+
+    public @Nullable String getMappedNamedSound(String id) {
+        if (backwardsSoundMappings == null) {
+            return null;
+        }
+
+        if (id.indexOf(':') == -1) {
+            id = "minecraft:" + id;
+        }
+
+        return backwardsSoundMappings.get(id);
+    }
+
+    public @Nullable String mappedEntityName(String entityName) {
+        return entityNames.get(entityName);
+    }
+
+    public @Nullable Int2ObjectMap<MappedItem> getBackwardsItemMappings() {
+        return backwardsItemMappings;
+    }
+
+    public @Nullable Map<String, String> getBackwardsSoundMappings() {
+        return backwardsSoundMappings;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/MappedItem.java

@@ -0,0 +1,39 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+
+public class MappedItem {
+
+    private final int id;
+    private final String jsonName;
+
+    public MappedItem(int id, String name) {
+        this.id = id;
+        this.jsonName = ChatRewriter.legacyTextToJsonString("§f" + name);
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public String getJsonName() {
+        return jsonName;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/MappedLegacyBlockItem.java

@@ -0,0 +1,76 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viabackwards.utils.Block;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class MappedLegacyBlockItem {
+
+    private final int id;
+    private final short data;
+    private final String name;
+    private final Block block;
+    private BlockEntityHandler blockEntityHandler;
+
+    public MappedLegacyBlockItem(int id, short data, @Nullable String name, boolean block) {
+        this.id = id;
+        this.data = data;
+        this.name = name != null ? "§f" + name : null;
+        this.block = block ? new Block(id, data) : null;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public short getData() {
+        return data;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public boolean isBlock() {
+        return block != null;
+    }
+
+    public Block getBlock() {
+        return block;
+    }
+
+    public boolean hasBlockEntityHandler() {
+        return blockEntityHandler != null;
+    }
+
+    public @Nullable BlockEntityHandler getBlockEntityHandler() {
+        return blockEntityHandler;
+    }
+
+    public void setBlockEntityHandler(@Nullable BlockEntityHandler blockEntityHandler) {
+        this.blockEntityHandler = blockEntityHandler;
+    }
+
+    @FunctionalInterface
+    public interface BlockEntityHandler {
+
+        CompoundTag handleOrNewCompoundTag(int block, CompoundTag tag);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/VBMappingDataLoader.java

@@ -0,0 +1,174 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonIOException;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+import com.viaversion.viaversion.libs.gson.JsonSyntaxException;
+import com.viaversion.viaversion.util.GsonUtil;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.util.HashMap;
+import java.util.Map;
+
+public final class VBMappingDataLoader {
+
+    public static JsonObject loadFromDataDir(String name) {
+        File file = new File(ViaBackwards.getPlatform().getDataFolder(), name);
+        if (!file.exists()) return loadData(name);
+
+        // Load the file from the platform's directory if present
+        try (FileReader reader = new FileReader(file)) {
+            return GsonUtil.getGson().fromJson(reader, JsonObject.class);
+        } catch (JsonSyntaxException e) {
+            ViaBackwards.getPlatform().getLogger().warning(name + " is badly formatted!");
+            e.printStackTrace();
+            ViaBackwards.getPlatform().getLogger().warning("Falling back to resource's file!");
+            return loadData(name);
+        } catch (IOException | JsonIOException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    public static JsonObject loadData(String name) {
+        InputStream stream = VBMappingDataLoader.class.getClassLoader().getResourceAsStream("assets/viabackwards/data/" + name);
+        try (InputStreamReader reader = new InputStreamReader(stream)) {
+            return GsonUtil.getGson().fromJson(reader, JsonObject.class);
+        } catch (IOException e) {
+            e.printStackTrace();
+            return null;
+        }
+    }
+
+    public static void mapIdentifiers(int[] output, JsonObject oldIdentifiers, JsonObject newIdentifiers, JsonObject diffIdentifiers, boolean warnOnMissing) {
+        Object2IntMap<String> newIdentifierMap = MappingDataLoader.indexedObjectToMap(newIdentifiers);
+        for (Map.Entry<String, JsonElement> entry : oldIdentifiers.entrySet()) {
+            String key = entry.getValue().getAsString();
+            int mappedId = newIdentifierMap.getInt(key);
+            if (mappedId == -1) {
+                if (diffIdentifiers != null) {
+                    // Search in diff mappings
+                    JsonPrimitive diffValueJson = diffIdentifiers.getAsJsonPrimitive(key);
+                    String diffValue = diffValueJson != null ? diffValueJson.getAsString() : null;
+
+                    int dataIndex;
+                    if (diffValue == null && (dataIndex = key.indexOf('[')) != -1
+                            && (diffValueJson = diffIdentifiers.getAsJsonPrimitive(key.substring(0, dataIndex))) != null) {
+                        // Check for wildcard mappings
+                        diffValue = diffValueJson.getAsString();
+
+                        // Keep original properties if value ends with [
+                        if (diffValue.endsWith("[")) {
+                            diffValue += key.substring(dataIndex + 1);
+                        }
+                    }
+
+                    if (diffValue != null) {
+                        mappedId = newIdentifierMap.getInt(diffValue);
+                    }
+                }
+
+                if (mappedId == -1) {
+                    // Nothing found :(
+                    if (warnOnMissing && !Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                        ViaBackwards.getPlatform().getLogger().warning("No key for " + entry.getValue() + " :( ");
+                    }
+                    continue;
+                }
+            }
+
+            output[Integer.parseInt(entry.getKey())] = mappedId;
+        }
+    }
+
+    public static Map<String, String> objectToNamespacedMap(JsonObject object) {
+        Map<String, String> mappings = new HashMap<>(object.size());
+        for (Map.Entry<String, JsonElement> entry : object.entrySet()) {
+            String key = entry.getKey();
+            if (key.indexOf(':') == -1) {
+                key = "minecraft:" + key;
+            }
+            String value = entry.getValue().getAsString();
+            if (value.indexOf(':') == -1) {
+                value = "minecraft:" + value;
+            }
+            mappings.put(key, value);
+        }
+        return mappings;
+    }
+
+    public static Map<String, String> objectToMap(JsonObject object) {
+        Map<String, String> mappings = new HashMap<>(object.size());
+        for (Map.Entry<String, JsonElement> entry : object.entrySet()) {
+            mappings.put(entry.getKey(), entry.getValue().getAsString());
+        }
+        return mappings;
+    }
+
+    public static Int2ObjectMap<MappedItem> loadItemMappings(JsonObject oldMapping, JsonObject newMapping, JsonObject diffMapping, boolean warnOnMissing) {
+        Int2ObjectMap<MappedItem> itemMapping = new Int2ObjectOpenHashMap<>(diffMapping.size(), 0.99F);
+        Object2IntMap<String> newIdenfierMap = MappingDataLoader.indexedObjectToMap(newMapping);
+        Object2IntMap<String> oldIdenfierMap = MappingDataLoader.indexedObjectToMap(oldMapping);
+        for (Map.Entry<String, JsonElement> entry : diffMapping.entrySet()) {
+            JsonObject object = entry.getValue().getAsJsonObject();
+            String mappedIdName = object.getAsJsonPrimitive("id").getAsString();
+            int mappedId = newIdenfierMap.getInt(mappedIdName);
+            if (mappedId == -1) {
+                if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                    ViaBackwards.getPlatform().getLogger().warning("No key for " + mappedIdName + " :( ");
+                }
+                continue;
+            }
+
+            int oldId = oldIdenfierMap.getInt(entry.getKey());
+            if (oldId == -1) {
+                if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                    ViaBackwards.getPlatform().getLogger().warning("No old entry for " + mappedIdName + " :( ");
+                }
+                continue;
+            }
+
+            String name = object.getAsJsonPrimitive("name").getAsString();
+            itemMapping.put(oldId, new MappedItem(mappedId, name));
+        }
+
+        // Look for missing keys
+        if (warnOnMissing && !Via.getConfig().isSuppressConversionWarnings()) {
+            for (Object2IntMap.Entry<String> entry : oldIdenfierMap.object2IntEntrySet()) {
+                if (!newIdenfierMap.containsKey(entry.getKey()) && !itemMapping.containsKey(entry.getIntValue())) {
+                    ViaBackwards.getPlatform().getLogger().warning("No item mapping for " + entry.getKey() + " :( ");
+                }
+            }
+        }
+
+        return itemMapping;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/data/VBMappings.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.data;
+
+import com.viaversion.viaversion.api.data.IntArrayMappings;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.api.data.Mappings;
+
+import java.util.Arrays;
+
+public final class VBMappings extends IntArrayMappings {
+
+    private VBMappings(final int[] oldToNew, final int mappedIds) {
+        super(oldToNew, mappedIds);
+    }
+
+    public static Mappings.Builder<VBMappings> vbBuilder() {
+        return new Builder(VBMappings::new);
+    }
+
+    public static final class Builder extends Mappings.Builder<VBMappings> {
+
+        private Builder(final MappingsSupplier<VBMappings> supplier) {
+            super(supplier);
+        }
+
+        @Override
+        public VBMappings build() {
+            final int size = this.size != -1 ? this.size : size(unmapped);
+            final int mappedSize = this.mappedSize != -1 ? this.mappedSize : size(mapped);
+            final int[] mappings = new int[size];
+            Arrays.fill(mappings, -1);
+            // Do conversion if one is an array and the other an object, otherwise directly map
+            if (unmapped.isJsonArray()) {
+                if (mapped.isJsonObject()) {
+                    VBMappingDataLoader.mapIdentifiers(mappings, toJsonObject(unmapped.getAsJsonArray()), mapped.getAsJsonObject(), diffMappings, warnOnMissing);
+                } else {
+                    // Use the normal loader
+                    MappingDataLoader.mapIdentifiers(mappings, unmapped.getAsJsonArray(), mapped.getAsJsonArray(), diffMappings, warnOnMissing);
+                }
+            } else if (mapped.isJsonArray()) {
+                VBMappingDataLoader.mapIdentifiers(mappings, unmapped.getAsJsonObject(), toJsonObject(mapped.getAsJsonArray()), diffMappings, warnOnMissing);
+            } else {
+                VBMappingDataLoader.mapIdentifiers(mappings, unmapped.getAsJsonObject(), mapped.getAsJsonObject(), diffMappings, warnOnMissing);
+            }
+            return supplier.supply(mappings, mappedSize);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityData.java

@@ -0,0 +1,124 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.Locale;
+
+public class EntityData {
+    private final BackwardsProtocol<?, ?, ?, ?> protocol;
+    private final int id;
+    private final int replacementId;
+    private final String key;
+    private NameVisibility nameVisibility = NameVisibility.NONE;
+    private MetaCreator defaultMeta;
+
+    public EntityData(BackwardsProtocol<?, ?, ?, ?> protocol, EntityType type, int replacementId) {
+        this(protocol, type.name(), type.getId(), replacementId);
+    }
+
+    public EntityData(BackwardsProtocol<?, ?, ?, ?> protocol, String key, int id, int replacementId) {
+        this.protocol = protocol;
+        this.id = id;
+        this.replacementId = replacementId;
+        this.key = key.toLowerCase(Locale.ROOT);
+    }
+
+    public EntityData jsonName() {
+        this.nameVisibility = NameVisibility.JSON;
+        return this;
+    }
+
+    public EntityData plainName() {
+        this.nameVisibility = NameVisibility.PLAIN;
+        return this;
+    }
+
+    public EntityData spawnMetadata(MetaCreator handler) {
+        this.defaultMeta = handler;
+        return this;
+    }
+
+    public boolean hasBaseMeta() {
+        return this.defaultMeta != null;
+    }
+
+    public int typeId() {
+        return id;
+    }
+
+    /**
+     * @return custom mobname, can be either a String or a JsonElement
+     */
+    public @Nullable Object mobName() {
+        if (nameVisibility == NameVisibility.NONE) {
+            return null;
+        }
+
+        String name = protocol.getMappingData().mappedEntityName(key);
+        if (name == null) {
+            ViaBackwards.getPlatform().getLogger().warning("Entity name for " + key + " not found in protocol " + protocol.getClass().getSimpleName());
+            name = key;
+        }
+        return nameVisibility == NameVisibility.JSON ? ChatRewriter.legacyTextToJson(name) : name;
+    }
+
+    public int replacementId() {
+        return replacementId;
+    }
+
+    public @Nullable MetaCreator defaultMeta() {
+        return defaultMeta;
+    }
+
+    public boolean isObjectType() {
+        return false;
+    }
+
+    public int objectData() {
+        return -1;
+    }
+
+    @Override
+    public String toString() {
+        return "EntityData{" +
+                "id=" + id +
+                ", mobName='" + key + '\'' +
+                ", replacementId=" + replacementId +
+                ", defaultMeta=" + defaultMeta +
+                '}';
+    }
+
+    @FunctionalInterface
+    public interface MetaCreator {
+
+        void createMeta(WrappedMetadata storage);
+    }
+
+    private enum NameVisibility {
+        PLAIN,
+        JSON,
+        NONE
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityObjectData.java

@@ -0,0 +1,39 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+
+public class EntityObjectData extends EntityData {
+    private final int objectData;
+
+    public EntityObjectData(BackwardsProtocol<?, ?, ?, ?> protocol, String key, int id, int replacementId, int objectData) {
+        super(protocol, key, id, replacementId);
+        this.objectData = objectData;
+    }
+
+    @Override
+    public boolean isObjectType() {
+        return true;
+    }
+
+    @Override
+    public int objectData() {
+        return objectData;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityPositionHandler.java

@@ -0,0 +1,120 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.rewriters.EntityRewriterBase;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+
+import java.util.function.Supplier;
+
+public class EntityPositionHandler {
+
+    public static final double RELATIVE_MOVE_FACTOR = 32 * 128;
+    private final EntityRewriterBase entityRewriter;
+    private final Class<? extends EntityPositionStorage> storageClass;
+    private final Supplier<? extends EntityPositionStorage> storageSupplier;
+    private boolean warnedForMissingEntity;
+
+    public EntityPositionHandler(EntityRewriterBase entityRewriter,
+                                 Class<? extends EntityPositionStorage> storageClass, Supplier<? extends EntityPositionStorage> storageSupplier) {
+        this.entityRewriter = entityRewriter;
+        this.storageClass = storageClass;
+        this.storageSupplier = storageSupplier;
+    }
+
+    public void cacheEntityPosition(PacketWrapper wrapper, boolean create, boolean relative) throws Exception {
+        cacheEntityPosition(wrapper,
+                wrapper.get(Type.DOUBLE, 0), wrapper.get(Type.DOUBLE, 1), wrapper.get(Type.DOUBLE, 2), create, relative);
+    }
+
+    public void cacheEntityPosition(PacketWrapper wrapper, double x, double y, double z, boolean create, boolean relative) throws Exception {
+        int entityId = wrapper.get(Type.VAR_INT, 0);
+        StoredEntityData storedEntity = entityRewriter.tracker(wrapper.user()).entityData(entityId);
+        if (storedEntity == null) {
+            if (Via.getManager().isDebug()) { // There is too many plugins violating this out there, and reading seems to be hard! :>
+                ViaBackwards.getPlatform().getLogger().warning("Stored entity with id " + entityId + " missing at position: " + x + " - " + y + " - " + z + " in " + storageClass.getSimpleName());
+                if (entityId == -1 && x == 0 && y == 0 && z == 0) {
+                    ViaBackwards.getPlatform().getLogger().warning("DO NOT REPORT THIS TO VIA, THIS IS A PLUGIN ISSUE");
+                } else if (!warnedForMissingEntity) {
+                    warnedForMissingEntity = true;
+                    ViaBackwards.getPlatform().getLogger().warning("This is very likely caused by a plugin sending a teleport packet for an entity outside of the player's range.");
+                }
+            }
+            return;
+        }
+
+        EntityPositionStorage positionStorage;
+        if (create) {
+            positionStorage = storageSupplier.get();
+            storedEntity.put(positionStorage);
+        } else {
+            positionStorage = storedEntity.get(storageClass);
+            if (positionStorage == null) {
+                ViaBackwards.getPlatform().getLogger().warning("Stored entity with id " + entityId + " missing " + storageClass.getSimpleName());
+                return;
+            }
+        }
+
+        positionStorage.setCoordinates(x, y, z, relative);
+    }
+
+    public EntityPositionStorage getStorage(UserConnection user, int entityId) {
+        StoredEntityData storedEntity = entityRewriter.tracker(user).entityData(entityId);
+        EntityPositionStorage entityStorage;
+        if (storedEntity == null || (entityStorage = storedEntity.get(EntityPositionStorage.class)) == null) {
+            ViaBackwards.getPlatform().getLogger().warning("Untracked entity with id " + entityId + " in " + storageClass.getSimpleName());
+            return null;
+        }
+        return entityStorage;
+    }
+
+    public static void writeFacingAngles(PacketWrapper wrapper, double x, double y, double z, double targetX, double targetY, double targetZ) {
+        double dX = targetX - x;
+        double dY = targetY - y;
+        double dZ = targetZ - z;
+        double r = Math.sqrt(dX * dX + dY * dY + dZ * dZ);
+        double yaw = -Math.atan2(dX, dZ) / Math.PI * 180;
+        if (yaw < 0) {
+            yaw = 360 + yaw;
+        }
+        double pitch = -Math.asin(dY / r) / Math.PI * 180;
+
+        wrapper.write(Type.BYTE, (byte) (yaw * 256f / 360f));
+        wrapper.write(Type.BYTE, (byte) (pitch * 256f / 360f));
+    }
+
+    public static void writeFacingDegrees(PacketWrapper wrapper, double x, double y, double z, double targetX, double targetY, double targetZ) {
+        double dX = targetX - x;
+        double dY = targetY - y;
+        double dZ = targetZ - z;
+        double r = Math.sqrt(dX * dX + dY * dY + dZ * dZ);
+        double yaw = -Math.atan2(dX, dZ) / Math.PI * 180;
+        if (yaw < 0) {
+            yaw = 360 + yaw;
+        }
+        double pitch = -Math.asin(dY / r) / Math.PI * 180;
+
+        wrapper.write(Type.FLOAT, (float) yaw);
+        wrapper.write(Type.FLOAT, (float) pitch);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/EntityPositionStorage.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+public abstract class EntityPositionStorage {
+    private double x;
+    private double y;
+    private double z;
+
+    public double getX() {
+        return x;
+    }
+
+    public double getY() {
+        return y;
+    }
+
+    public double getZ() {
+        return z;
+    }
+
+    public void setCoordinates(double x, double y, double z, boolean relative) {
+        if (relative) {
+            this.x += x;
+            this.y += y;
+            this.z += z;
+        } else {
+            this.x = x;
+            this.y = y;
+            this.z = z;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/PlayerPositionStorage.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+
+public abstract class PlayerPositionStorage implements StorableObject {
+    private double x;
+    private double y;
+    private double z;
+
+    protected PlayerPositionStorage() {
+    }
+
+    public double getX() {
+        return x;
+    }
+
+    public double getY() {
+        return y;
+    }
+
+    public double getZ() {
+        return z;
+    }
+
+    public void setX(final double x) {
+        this.x = x;
+    }
+
+    public void setY(final double y) {
+        this.y = y;
+    }
+
+    public void setZ(final double z) {
+        this.z = z;
+    }
+
+    public void setCoordinates(PacketWrapper wrapper, boolean relative) throws Exception {
+        setCoordinates(wrapper.get(Type.DOUBLE, 0), wrapper.get(Type.DOUBLE, 1), wrapper.get(Type.DOUBLE, 2), relative);
+    }
+
+    public void setCoordinates(double x, double y, double z, boolean relative) {
+        if (relative) {
+            this.x += x;
+            this.y += y;
+            this.z += z;
+        } else {
+            this.x = x;
+            this.y = y;
+            this.z = z;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/entities/storage/WrappedMetadata.java

@@ -0,0 +1,66 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.entities.storage;
+
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.List;
+
+public final class WrappedMetadata {
+    private final List<Metadata> metadataList;
+
+    public WrappedMetadata(List<Metadata> metadataList) {
+        this.metadataList = metadataList;
+    }
+
+    public boolean has(Metadata data) {
+        return this.metadataList.contains(data);
+    }
+
+    public void remove(Metadata data) {
+        this.metadataList.remove(data);
+    }
+
+    public void remove(int index) {
+        metadataList.removeIf(meta -> meta.id() == index);
+    }
+
+    public void add(Metadata data) {
+        this.metadataList.add(data);
+    }
+
+    public @Nullable Metadata get(int index) {
+        for (Metadata meta : this.metadataList) {
+            if (index == meta.id()) {
+                return meta;
+            }
+        }
+        return null;
+    }
+
+    public List<Metadata> metadataList() {
+        return metadataList;
+    }
+
+    @Override
+    public String toString() {
+        return "MetaStorage{" + "metaDataList=" + metadataList + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/exceptions/RemovedValueException.java

@@ -0,0 +1,34 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.exceptions;
+
+import java.io.IOException;
+
+public class RemovedValueException extends IOException {
+
+    /**
+     * May be cached since it is never actually printed, only checked.
+     */
+    public static final RemovedValueException EX = new RemovedValueException() {
+        @Override
+        public Throwable fillInStackTrace() {
+            return this;
+        }
+    };
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EnchantmentRewriter.java

@@ -0,0 +1,173 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ShortTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Rewriter to handle the addition of new enchantments.
+ */
+public class EnchantmentRewriter {
+
+    private final Map<String, String> enchantmentMappings = new HashMap<>();
+    private final ItemRewriter itemRewriter;
+    private final boolean jsonFormat;
+
+    public EnchantmentRewriter(ItemRewriter itemRewriter, boolean jsonFormat) {
+        this.itemRewriter = itemRewriter;
+        this.jsonFormat = jsonFormat;
+    }
+
+    public EnchantmentRewriter(ItemRewriter itemRewriter) {
+        this(itemRewriter, true);
+    }
+
+    public void registerEnchantment(String key, String replacementLore) {
+        enchantmentMappings.put(key, replacementLore);
+    }
+
+    public void handleToClient(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.get("Enchantments") instanceof ListTag) {
+            rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.get("StoredEnchantments") instanceof ListTag) {
+            rewriteEnchantmentsToClient(tag, true);
+        }
+    }
+
+    public void handleToServer(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.contains(itemRewriter.getNbtTagName() + "|Enchantments")) {
+            rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(itemRewriter.getNbtTagName() + "|StoredEnchantments")) {
+            rewriteEnchantmentsToServer(tag, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "Enchantments";
+        ListTag enchantments = tag.get(key);
+        List<Tag> loreToAdd = new ArrayList<>();
+        boolean changed = false;
+
+        Iterator<Tag> iterator = enchantments.iterator();
+        while (iterator.hasNext()) {
+            CompoundTag enchantmentEntry = (CompoundTag) iterator.next();
+            Tag idTag = enchantmentEntry.get("id");
+            if (!(idTag instanceof StringTag)) continue;
+
+            String enchantmentId = ((StringTag) idTag).getValue();
+            String remappedName = enchantmentMappings.get(enchantmentId);
+            if (remappedName != null) {
+                if (!changed) {
+                    // Backup original before doing modifications
+                    itemRewriter.saveListTag(tag, enchantments, key);
+                    changed = true;
+                }
+
+                iterator.remove();
+
+                int level = ((NumberTag) enchantmentEntry.get("lvl")).asInt();
+                String loreValue = remappedName + " " + getRomanNumber(level);
+                if (jsonFormat) {
+                    loreValue = ChatRewriter.legacyTextToJsonString(loreValue);
+                }
+
+                loreToAdd.add(new StringTag(loreValue));
+            }
+        }
+
+        if (!loreToAdd.isEmpty()) {
+            // Add dummy enchant for the glow effect if there are no actual enchantments left
+            if (!storedEnchant && enchantments.size() == 0) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.put("id", new StringTag());
+                dummyEnchantment.put("lvl", new ShortTag((short) 0));
+                enchantments.add(dummyEnchantment);
+            }
+
+            CompoundTag display = tag.get("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+
+            ListTag loreTag = display.get("Lore");
+            if (loreTag == null) {
+                display.put("Lore", loreTag = new ListTag(StringTag.class));
+            } else {
+                // Save original lore
+                itemRewriter.saveListTag(display, loreTag, "Lore");
+            }
+
+            loreToAdd.addAll(loreTag.getValue());
+            loreTag.setValue(loreToAdd);
+        }
+    }
+
+    public void rewriteEnchantmentsToServer(CompoundTag tag, boolean storedEnchant) {
+        // Just restore the original tag ig present (lore is always restored in the item rewriter)
+        String key = storedEnchant ? "StoredEnchantments" : "Enchantments";
+        itemRewriter.restoreListTag(tag, key);
+    }
+
+    public static String getRomanNumber(int number) {
+        switch (number) {
+            case 1:
+                return "I";
+            case 2:
+                return "II";
+            case 3:
+                return "III";
+            case 4:
+                return "IV";
+            case 5:
+                return "V";
+            case 6:
+                return "VI";
+            case 7:
+                return "VII";
+            case 8:
+                return "VIII";
+            case 9:
+                return "IX";
+            case 10:
+                return "X";
+            default:
+                return Integer.toString(number);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriter.java

@@ -0,0 +1,94 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_14;
+
+public abstract class EntityRewriter<T extends BackwardsProtocol> extends EntityRewriterBase<T> {
+
+    protected EntityRewriter(T protocol) {
+        this(protocol, Types1_14.META_TYPES.optionalComponentType, Types1_14.META_TYPES.booleanType);
+    }
+
+    protected EntityRewriter(T protocol, MetaType displayType, MetaType displayVisibilityType) {
+        super(protocol, displayType, 2, displayVisibilityType, 3);
+    }
+
+    @Override
+    public void registerTrackerWithData(ClientboundPacketType packetType, EntityType fallingBlockType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - Entity UUID
+                map(Type.VAR_INT); // 2 - Entity Type
+                map(Type.DOUBLE); // 3 - X
+                map(Type.DOUBLE); // 4 - Y
+                map(Type.DOUBLE); // 5 - Z
+                map(Type.BYTE); // 6 - Pitch
+                map(Type.BYTE); // 7 - Yaw
+                map(Type.INT); // 8 - Data
+                handler(getSpawnTrackerWithDataHandler(fallingBlockType));
+            }
+        });
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler(EntityType fallingBlockType) {
+        return wrapper -> {
+            // Check against the UNMAPPED entity type
+            EntityType entityType = setOldEntityId(wrapper);
+            if (entityType == fallingBlockType) {
+                int blockState = wrapper.get(Type.INT, 0);
+                wrapper.set(Type.INT, 0, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public void registerSpawnTracker(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                map(Type.UUID); // 1 - Entity UUID
+                map(Type.VAR_INT); // 2 - Entity Type
+                handler(wrapper -> setOldEntityId(wrapper));
+            }
+        });
+    }
+
+    private EntityType setOldEntityId(PacketWrapper wrapper) throws Exception {
+        int typeId = wrapper.get(Type.VAR_INT, 1);
+        EntityType entityType = typeFromId(typeId);
+        tracker(wrapper.user()).addEntity(wrapper.get(Type.VAR_INT, 0), entityType);
+
+        int mappedTypeId = newEntityId(entityType.getId());
+        if (typeId != mappedTypeId) {
+            wrapper.set(Type.VAR_INT, 1, mappedTypeId);
+        }
+
+        return entityType;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/EntityRewriterBase.java

@@ -0,0 +1,205 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.google.common.base.Preconditions;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.entities.storage.EntityData;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.rewriter.EntityRewriter;
+import com.viaversion.viaversion.rewriter.meta.MetaHandlerEvent;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.List;
+
+/**
+ * Entity rewriter base class.
+ *
+ * @see com.viaversion.viabackwards.api.rewriters.EntityRewriter
+ * @see LegacyEntityRewriter
+ */
+public abstract class EntityRewriterBase<T extends BackwardsProtocol> extends EntityRewriter<T> {
+    private final Int2ObjectMap<EntityData> entityDataMappings = new Int2ObjectOpenHashMap<>();
+    private final MetaType displayNameMetaType;
+    private final MetaType displayVisibilityMetaType;
+    private final int displayNameIndex;
+    private final int displayVisibilityIndex;
+
+    EntityRewriterBase(T protocol, MetaType displayNameMetaType, int displayNameIndex,
+                       MetaType displayVisibilityMetaType, int displayVisibilityIndex) {
+        super(protocol, false);
+        this.displayNameMetaType = displayNameMetaType;
+        this.displayNameIndex = displayNameIndex;
+        this.displayVisibilityMetaType = displayVisibilityMetaType;
+        this.displayVisibilityIndex = displayVisibilityIndex;
+    }
+
+    @Override
+    public void handleMetadata(int entityId, List<Metadata> metadataList, UserConnection connection) {
+        super.handleMetadata(entityId, metadataList, connection);
+
+        EntityType type = tracker(connection).entityType(entityId);
+        if (type == null) {
+            return; // Don't handle untracked entities - basically always the fault of a plugin sending virtual entities through concurrency-unsafe handling
+        }
+
+        EntityData entityData = entityDataForType(type);
+
+        // Set the mapped entity name if there is no custom name set already
+        Metadata meta = getMeta(displayNameIndex, metadataList);
+        if (meta != null && entityData != null && entityData.mobName() != null
+                && (meta.getValue() == null || meta.getValue().toString().isEmpty())
+                && meta.metaType().typeId() == displayNameMetaType.typeId()) {
+            meta.setValue(entityData.mobName());
+            if (ViaBackwards.getConfig().alwaysShowOriginalMobName()) {
+                removeMeta(displayVisibilityIndex, metadataList);
+                metadataList.add(new Metadata(displayVisibilityIndex, displayVisibilityMetaType, true));
+            }
+        }
+
+        // Add any other extra meta for mapped entities
+        //TODO only do this once for a first meta packet?
+        if (entityData != null && entityData.hasBaseMeta()) {
+            entityData.defaultMeta().createMeta(new WrappedMetadata(metadataList));
+        }
+    }
+
+    protected @Nullable Metadata getMeta(int metaIndex, List<Metadata> metadataList) {
+        for (Metadata metadata : metadataList) {
+            if (metadata.id() == metaIndex) {
+                return metadata;
+            }
+        }
+        return null;
+    }
+
+    protected void removeMeta(int metaIndex, List<Metadata> metadataList) {
+        metadataList.removeIf(meta -> meta.id() == metaIndex);
+    }
+
+    protected boolean hasData(EntityType type) {
+        return entityDataMappings.containsKey(type.getId());
+    }
+
+    protected @Nullable EntityData entityDataForType(EntityType type) {
+        return entityDataMappings.get(type.getId());
+    }
+
+    protected @Nullable StoredEntityData storedEntityData(MetaHandlerEvent event) {
+        return tracker(event.user()).entityData(event.entityId());
+    }
+
+    /**
+     * Maps an entity type to another with extra data.
+     * Note that both types should be of the same version.
+     *
+     * @param type       entity type
+     * @param mappedType mapped entity type
+     * @return created entity data
+     * @see #mapEntityType(EntityType, EntityType) for id only rewriting
+     */
+    protected EntityData mapEntityTypeWithData(EntityType type, EntityType mappedType) {
+        Preconditions.checkArgument(type.getClass() == mappedType.getClass());
+
+        // Already rewrite the id here
+        int mappedReplacementId = newEntityId(mappedType.getId());
+        EntityData data = new EntityData(protocol, type, mappedReplacementId);
+        mapEntityType(type.getId(), mappedReplacementId);
+        entityDataMappings.put(type.getId(), data);
+        return data;
+    }
+
+    /**
+     * Maps entity ids based on the enum constant's names.
+     *
+     * @param oldTypes     entity types of the higher version
+     * @param newTypeClass entity types enum class of the lower version
+     * @param <E>          new enum type
+     */
+    @Override
+    public <E extends Enum<E> & EntityType> void mapTypes(EntityType[] oldTypes, Class<E> newTypeClass) {
+        if (typeMappings == null) {
+            typeMappings = new Int2IntOpenHashMap(oldTypes.length, 0.99F);
+            typeMappings.defaultReturnValue(-1);
+        }
+        for (EntityType oldType : oldTypes) {
+            try {
+                E newType = Enum.valueOf(newTypeClass, oldType.name());
+                typeMappings.put(oldType.getId(), newType.getId());
+            } catch (IllegalArgumentException ignored) {
+                // Don't warn
+            }
+        }
+    }
+
+    public void registerMetaTypeHandler(@Nullable MetaType itemType, @Nullable MetaType blockType, @Nullable MetaType particleType, @Nullable MetaType optChatType) {
+        filter().handler((event, meta) -> {
+            MetaType type = meta.metaType();
+            if (itemType != null && type == itemType) {
+                protocol.getItemRewriter().handleItemToClient(meta.value());
+            } else if (blockType != null && type == blockType) {
+                int data = meta.value();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (particleType != null && type == particleType) {
+                rewriteParticle(meta.value());
+            } else if (optChatType != null && type == optChatType) {
+                JsonElement text = meta.value();
+                if (text != null) {
+                    protocol.getTranslatableRewriter().processText(text);
+                }
+            }
+        });
+    }
+
+    // ONLY TRACKS, DOESN'T REWRITE IDS
+    protected PacketHandler getTrackerHandler(Type<? extends Number> intType, int typeIndex) {
+        return wrapper -> {
+            Number id = wrapper.get(intType, typeIndex);
+            tracker(wrapper.user()).addEntity(wrapper.get(Type.VAR_INT, 0), typeFromId(id.intValue()));
+        };
+    }
+
+    protected PacketHandler getTrackerHandler() {
+        return getTrackerHandler(Type.VAR_INT, 1);
+    }
+
+    protected PacketHandler getTrackerHandler(EntityType entityType, Type<? extends Number> intType) {
+        return wrapper -> tracker(wrapper.user()).addEntity((int) wrapper.get(intType, 0), entityType);
+    }
+
+    protected PacketHandler getDimensionHandler(int index) {
+        return wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+            int dimensionId = wrapper.get(Type.INT, index);
+            clientWorld.setEnvironment(dimensionId);
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriter.java

@@ -0,0 +1,114 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.MappedItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class ItemRewriter<T extends BackwardsProtocol> extends ItemRewriterBase<T> {
+
+    private final TranslatableRewriter translatableRewriter;
+
+    protected ItemRewriter(T protocol, @Nullable TranslatableRewriter translatableRewriter) {
+        super(protocol, true);
+        this.translatableRewriter = translatableRewriter;
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(@Nullable Item item) {
+        if (item == null) return null;
+
+        CompoundTag display = item.tag() != null ? item.tag().get("display") : null;
+        if (translatableRewriter != null && display != null) {
+            // Handle name and lore components
+            StringTag name = display.get("Name");
+            if (name != null) {
+                String newValue = translatableRewriter.processText(name.getValue()).toString();
+                if (!newValue.equals(name.getValue())) {
+                    saveStringTag(display, name, "Name");
+                }
+
+                name.setValue(newValue);
+            }
+
+            ListTag lore = display.get("Lore");
+            if (lore != null) {
+                boolean changed = false;
+                for (Tag loreEntryTag : lore) {
+                    if (!(loreEntryTag instanceof StringTag)) continue;
+
+                    StringTag loreEntry = (StringTag) loreEntryTag;
+                    String newValue = translatableRewriter.processText(loreEntry.getValue()).toString();
+                    if (!changed && !newValue.equals(loreEntry.getValue())) {
+                        // Backup original lore before doing any modifications
+                        changed = true;
+                        saveListTag(display, lore, "Lore");
+                    }
+
+                    loreEntry.setValue(newValue);
+                }
+            }
+        }
+
+        MappedItem data = protocol.getMappingData().getMappedItem(item.identifier());
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(item);
+        }
+
+        if (item.tag() == null) {
+            item.setTag(new CompoundTag());
+        }
+
+        // Save original id, set remapped id
+        item.tag().put(nbtTagName + "|id", new IntTag(item.identifier()));
+        item.setIdentifier(data.getId());
+
+        // Set custom name - only done if there is no original one
+        if (display == null) {
+            item.tag().put("display", display = new CompoundTag());
+        }
+        if (!display.contains("Name")) {
+            display.put("Name", new StringTag(data.getJsonName()));
+            display.put(nbtTagName + "|customName", new ByteTag());
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(@Nullable Item item) {
+        if (item == null) return null;
+
+        super.handleItemToServer(item);
+        if (item.tag() != null) {
+            IntTag originalId = item.tag().remove(nbtTagName + "|id");
+            if (originalId != null) {
+                item.setIdentifier(originalId.asInt());
+            }
+        }
+        return item;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/ItemRewriterBase.java

@@ -0,0 +1,108 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.rewriter.ItemRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class ItemRewriterBase<T extends BackwardsProtocol> extends ItemRewriter<T> {
+
+    protected final String nbtTagName;
+    protected final boolean jsonNameFormat;
+
+    protected ItemRewriterBase(T protocol, boolean jsonNameFormat) {
+        super(protocol);
+        this.jsonNameFormat = jsonNameFormat;
+        nbtTagName = "VB|" + protocol.getClass().getSimpleName();
+    }
+
+    public @Nullable Item handleItemToServer(@Nullable Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(item);
+
+        restoreDisplayTag(item);
+        return item;
+    }
+
+    protected boolean hasBackupTag(CompoundTag displayTag, String tagName) {
+        return displayTag.contains(nbtTagName + "|o" + tagName);
+    }
+
+    protected void saveStringTag(CompoundTag displayTag, StringTag original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName + "|o" + name;
+        if (!displayTag.contains(backupName)) {
+            displayTag.put(backupName, new StringTag(original.getValue()));
+        }
+    }
+
+    protected void saveListTag(CompoundTag displayTag, ListTag original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName + "|o" + name;
+        if (!displayTag.contains(backupName)) {
+            // Clone all tag entries
+            ListTag listTag = new ListTag();
+            for (Tag tag : original.getValue()) {
+                listTag.add(tag.clone());
+            }
+
+            displayTag.put(backupName, listTag);
+        }
+    }
+
+    protected void restoreDisplayTag(Item item) {
+        if (item.tag() == null) return;
+
+        CompoundTag display = item.tag().get("display");
+        if (display != null) {
+            // Remove custom name / restore original name
+            if (display.remove(nbtTagName + "|customName") != null) {
+                display.remove("Name");
+            } else {
+                restoreStringTag(display, "Name");
+            }
+
+            // Restore lore
+            restoreListTag(display, "Lore");
+        }
+    }
+
+    protected void restoreStringTag(CompoundTag tag, String tagName) {
+        StringTag original = tag.remove(nbtTagName + "|o" + tagName);
+        if (original != null) {
+            tag.put(tagName, new StringTag(original.getValue()));
+        }
+    }
+
+    protected void restoreListTag(CompoundTag tag, String tagName) {
+        ListTag original = tag.remove(nbtTagName + "|o" + tagName);
+        if (original != null) {
+            tag.put(tagName, new ListTag(original.getValue()));
+        }
+    }
+
+    public String getNbtTagName() {
+        return nbtTagName;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyBlockItemRewriter.java

@@ -0,0 +1,303 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
+import com.viaversion.viabackwards.api.data.VBMappingDataLoader;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.BlockColors;
+import com.viaversion.viabackwards.utils.Block;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public abstract class LegacyBlockItemRewriter<T extends BackwardsProtocol> extends ItemRewriterBase<T> {
+
+    private static final Map<String, Int2ObjectMap<MappedLegacyBlockItem>> LEGACY_MAPPINGS = new HashMap<>();
+    protected final Int2ObjectMap<MappedLegacyBlockItem> replacementData;
+
+    static {
+        JsonObject jsonObject = VBMappingDataLoader.loadFromDataDir("legacy-mappings.json");
+        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
+            Int2ObjectMap<MappedLegacyBlockItem> mappings = new Int2ObjectOpenHashMap<>(8);
+            LEGACY_MAPPINGS.put(entry.getKey(), mappings);
+            for (Map.Entry<String, JsonElement> dataEntry : entry.getValue().getAsJsonObject().entrySet()) {
+                JsonObject object = dataEntry.getValue().getAsJsonObject();
+                int id = object.getAsJsonPrimitive("id").getAsInt();
+                JsonPrimitive jsonData = object.getAsJsonPrimitive("data");
+                short data = jsonData != null ? jsonData.getAsShort() : 0;
+                String name = object.getAsJsonPrimitive("name").getAsString();
+                JsonPrimitive blockField = object.getAsJsonPrimitive("block");
+                boolean block = blockField != null && blockField.getAsBoolean();
+
+                if (dataEntry.getKey().indexOf('-') != -1) {
+                    // Range of ids
+                    String[] split = dataEntry.getKey().split("-", 2);
+                    int from = Integer.parseInt(split[0]);
+                    int to = Integer.parseInt(split[1]);
+
+                    // Special block color handling
+                    if (name.contains("%color%")) {
+                        for (int i = from; i <= to; i++) {
+                            mappings.put(i, new MappedLegacyBlockItem(id, data, name.replace("%color%", BlockColors.get(i - from)), block));
+                        }
+                    } else {
+                        MappedLegacyBlockItem mappedBlockItem = new MappedLegacyBlockItem(id, data, name, block);
+                        for (int i = from; i <= to; i++) {
+                            mappings.put(i, mappedBlockItem);
+                        }
+                    }
+                } else {
+                    mappings.put(Integer.parseInt(dataEntry.getKey()), new MappedLegacyBlockItem(id, data, name, block));
+                }
+            }
+        }
+    }
+
+    protected LegacyBlockItemRewriter(T protocol) {
+        super(protocol, false);
+        replacementData = LEGACY_MAPPINGS.get(protocol.getClass().getSimpleName().split("To")[1].replace("_", "."));
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(@Nullable Item item) {
+        if (item == null) return null;
+
+        MappedLegacyBlockItem data = replacementData.get(item.identifier());
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(item);
+        }
+
+        short originalData = item.data();
+        item.setIdentifier(data.getId());
+        // Keep original data if mapped data is set to -1
+        if (data.getData() != -1) {
+            item.setData(data.getData());
+        }
+
+        // Set display name
+        if (data.getName() != null) {
+            if (item.tag() == null) {
+                item.setTag(new CompoundTag());
+            }
+
+            CompoundTag display = item.tag().get("display");
+            if (display == null) {
+                item.tag().put("display", display = new CompoundTag());
+            }
+
+            StringTag nameTag = display.get("Name");
+            if (nameTag == null) {
+                display.put("Name", nameTag = new StringTag(data.getName()));
+                display.put(nbtTagName + "|customName", new ByteTag());
+            }
+
+            // Handle colors
+            String value = nameTag.getValue();
+            if (value.contains("%vb_color%")) {
+                display.put("Name", new StringTag(value.replace("%vb_color%", BlockColors.get(originalData))));
+            }
+        }
+        return item;
+    }
+
+    public int handleBlockID(int idx) {
+        int type = idx >> 4;
+        int meta = idx & 15;
+
+        Block b = handleBlock(type, meta);
+        if (b == null) return idx;
+
+        return (b.getId() << 4 | (b.getData() & 15));
+    }
+
+    public @Nullable Block handleBlock(int blockId, int data) {
+        MappedLegacyBlockItem settings = replacementData.get(blockId);
+        if (settings == null || !settings.isBlock()) return null;
+
+        Block block = settings.getBlock();
+        // For some blocks, the data can still be useful (:
+        if (block.getData() == -1) {
+            return block.withData(data);
+        }
+        return block;
+    }
+
+    protected void handleChunk(Chunk chunk) {
+        // Map Block Entities
+        Map<Pos, CompoundTag> tags = new HashMap<>();
+        for (CompoundTag tag : chunk.getBlockEntities()) {
+            Tag xTag;
+            Tag yTag;
+            Tag zTag;
+            if ((xTag = tag.get("x")) == null || (yTag = tag.get("y")) == null || (zTag = tag.get("z")) == null) {
+                continue;
+            }
+
+            Pos pos = new Pos(
+                    ((NumberTag) xTag).asInt() & 0xF,
+                    ((NumberTag) yTag).asInt(),
+                    ((NumberTag) zTag).asInt() & 0xF);
+            tags.put(pos, tag);
+
+            // Handle given Block Entities
+            if (pos.getY() < 0 || pos.getY() > 255) continue; // 1.17
+
+            ChunkSection section = chunk.getSections()[pos.getY() >> 4];
+            if (section == null) continue;
+
+            int block = section.getFlatBlock(pos.getX(), pos.getY() & 0xF, pos.getZ());
+            int btype = block >> 4;
+
+            MappedLegacyBlockItem settings = replacementData.get(btype);
+            if (settings != null && settings.hasBlockEntityHandler()) {
+                settings.getBlockEntityHandler().handleOrNewCompoundTag(block, tag);
+            }
+        }
+
+        for (int i = 0; i < chunk.getSections().length; i++) {
+            ChunkSection section = chunk.getSections()[i];
+            if (section == null) continue;
+
+            boolean hasBlockEntityHandler = false;
+
+            // Map blocks
+            for (int j = 0; j < section.getPaletteSize(); j++) {
+                int block = section.getPaletteEntry(j);
+                int btype = block >> 4;
+                int meta = block & 0xF;
+
+                Block b = handleBlock(btype, meta);
+                if (b != null) {
+                    section.setPaletteEntry(j, (b.getId() << 4) | (b.getData() & 0xF));
+                }
+
+                // We already know that is has a handler
+                if (hasBlockEntityHandler) continue;
+
+                MappedLegacyBlockItem settings = replacementData.get(btype);
+                if (settings != null && settings.hasBlockEntityHandler()) {
+                    hasBlockEntityHandler = true;
+                }
+            }
+
+            if (!hasBlockEntityHandler) continue;
+
+            // We need to handle a Block Entity :(
+            for (int x = 0; x < 16; x++) {
+                for (int y = 0; y < 16; y++) {
+                    for (int z = 0; z < 16; z++) {
+                        int block = section.getFlatBlock(x, y, z);
+                        int btype = block >> 4;
+                        int meta = block & 15;
+
+                        MappedLegacyBlockItem settings = replacementData.get(btype);
+                        if (settings == null || !settings.hasBlockEntityHandler()) continue;
+
+                        Pos pos = new Pos(x, (y + (i << 4)), z);
+
+                        // Already handled above
+                        if (tags.containsKey(pos)) continue;
+
+                        CompoundTag tag = new CompoundTag();
+                        tag.put("x", new IntTag(x + (chunk.getX() << 4)));
+                        tag.put("y", new IntTag(y + (i << 4)));
+                        tag.put("z", new IntTag(z + (chunk.getZ() << 4)));
+
+                        settings.getBlockEntityHandler().handleOrNewCompoundTag(block, tag);
+                        chunk.getBlockEntities().add(tag);
+                    }
+                }
+            }
+        }
+    }
+
+    protected CompoundTag getNamedTag(String text) {
+        CompoundTag tag = new CompoundTag();
+        tag.put("display", new CompoundTag());
+        text = "§r" + text;
+        ((CompoundTag) tag.get("display")).put("Name", new StringTag(jsonNameFormat ? ChatRewriter.legacyTextToJsonString(text) : text));
+        return tag;
+    }
+
+    private static final class Pos {
+
+        private final int x;
+        private final short y;
+        private final int z;
+
+        private Pos(int x, int y, int z) {
+            this.x = x;
+            this.y = (short) y;
+            this.z = z;
+        }
+
+        public int getX() {
+            return x;
+        }
+
+        public int getY() {
+            return y;
+        }
+
+        public int getZ() {
+            return z;
+        }
+
+        @Override
+        public boolean equals(Object o) {
+            if (this == o) return true;
+            if (o == null || getClass() != o.getClass()) return false;
+            Pos pos = (Pos) o;
+            if (x != pos.x) return false;
+            if (y != pos.y) return false;
+            return z == pos.z;
+        }
+
+        @Override
+        public int hashCode() {
+            int result = x;
+            result = 31 * result + y;
+            result = 31 * result + z;
+            return result;
+        }
+
+        @Override
+        public String toString() {
+            return "Pos{" + "x=" + x + ", y=" + y + ", z=" + z + '}';
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyEnchantmentRewriter.java

@@ -0,0 +1,159 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ShortTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+public class LegacyEnchantmentRewriter {
+
+    private final Map<Short, String> enchantmentMappings = new HashMap<>();
+    private final String nbtTagName;
+    private Set<Short> hideLevelForEnchants;
+
+    public LegacyEnchantmentRewriter(String nbtTagName) {
+        this.nbtTagName = nbtTagName;
+    }
+
+    public void registerEnchantment(int id, String replacementLore) {
+        enchantmentMappings.put((short) id, replacementLore);
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "ench";
+        ListTag enchantments = tag.get(key);
+        ListTag remappedEnchantments = new ListTag(CompoundTag.class);
+        List<Tag> lore = new ArrayList<>();
+        for (Tag enchantmentEntry : enchantments.clone()) {
+            Tag idTag = ((CompoundTag) enchantmentEntry).get("id");
+            if (idTag == null) continue;
+
+            short newId = ((NumberTag) idTag).asShort();
+            String enchantmentName = enchantmentMappings.get(newId);
+            if (enchantmentName != null) {
+                enchantments.remove(enchantmentEntry);
+                short level = ((NumberTag) ((CompoundTag) enchantmentEntry).get("lvl")).asShort();
+                if (hideLevelForEnchants != null && hideLevelForEnchants.contains(newId)) {
+                    lore.add(new StringTag(enchantmentName));
+                } else {
+                    lore.add(new StringTag(enchantmentName + " " + EnchantmentRewriter.getRomanNumber(level)));
+                }
+                remappedEnchantments.add(enchantmentEntry);
+            }
+        }
+        if (!lore.isEmpty()) {
+            if (!storedEnchant && enchantments.size() == 0) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.put("id", new ShortTag((short) 0));
+                dummyEnchantment.put("lvl", new ShortTag((short) 0));
+                enchantments.add(dummyEnchantment);
+
+                tag.put(nbtTagName + "|dummyEnchant", new ByteTag());
+
+                IntTag hideFlags = tag.get("HideFlags");
+                if (hideFlags == null) {
+                    hideFlags = new IntTag();
+                } else {
+                    tag.put(nbtTagName + "|oldHideFlags", new IntTag(hideFlags.asByte()));
+                }
+
+                int flags = hideFlags.asByte() | 1;
+                hideFlags.setValue(flags);
+                tag.put("HideFlags", hideFlags);
+            }
+
+            tag.put(nbtTagName + "|" + key, remappedEnchantments);
+
+            CompoundTag display = tag.get("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+            ListTag loreTag = display.get("Lore");
+            if (loreTag == null) {
+                display.put("Lore", loreTag = new ListTag(StringTag.class));
+            }
+
+            lore.addAll(loreTag.getValue());
+            loreTag.setValue(lore);
+        }
+    }
+
+    public void rewriteEnchantmentsToServer(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "ench";
+        ListTag remappedEnchantments = tag.remove(nbtTagName + "|" + key);
+        ListTag enchantments = tag.get(key);
+        if (enchantments == null) {
+            enchantments = new ListTag(CompoundTag.class);
+        }
+
+        if (!storedEnchant && tag.remove(nbtTagName + "|dummyEnchant") != null) {
+            for (Tag enchantment : enchantments.clone()) {
+                short id = ((NumberTag) ((CompoundTag) enchantment).get("id")).asShort();
+                short level = ((NumberTag) ((CompoundTag) enchantment).get("lvl")).asShort();
+                if (id == 0 && level == 0) {
+                    enchantments.remove(enchantment);
+                }
+            }
+
+            IntTag hideFlags = tag.remove(nbtTagName + "|oldHideFlags");
+            if (hideFlags != null) {
+                tag.put("HideFlags", new IntTag(hideFlags.asByte()));
+            } else {
+                tag.remove("HideFlags");
+            }
+        }
+
+        CompoundTag display = tag.get("display");
+        // A few null checks just to be safe, though they shouldn't actually be
+        ListTag lore = display != null ? display.get("Lore") : null;
+        for (Tag enchantment : remappedEnchantments.clone()) {
+            enchantments.add(enchantment);
+            if (lore != null && lore.size() != 0) {
+                lore.remove(lore.get(0));
+            }
+        }
+        if (lore != null && lore.size() == 0) {
+            display.remove("Lore");
+            if (display.isEmpty()) {
+                tag.remove("display");
+            }
+        }
+
+        tag.put(key, enchantments);
+    }
+
+    public void setHideLevelForEnchants(int... enchants) {
+        this.hideLevelForEnchants = new HashSet<>();
+        for (int enchant : enchants) {
+            hideLevelForEnchants.add((short) enchant);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacyEntityRewriter.java

@@ -0,0 +1,173 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.entities.storage.EntityData;
+import com.viaversion.viabackwards.api.entities.storage.EntityObjectData;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.ObjectType;
+import com.viaversion.viaversion.api.minecraft.metadata.MetaType;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_9;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+
+public abstract class LegacyEntityRewriter<T extends BackwardsProtocol> extends EntityRewriterBase<T> {
+    private final Map<ObjectType, EntityData> objectTypes = new HashMap<>();
+
+    protected LegacyEntityRewriter(T protocol) {
+        this(protocol, MetaType1_9.String, MetaType1_9.Boolean);
+    }
+
+    protected LegacyEntityRewriter(T protocol, MetaType displayType, MetaType displayVisibilityType) {
+        super(protocol, displayType, 2, displayVisibilityType, 3);
+    }
+
+    protected EntityObjectData mapObjectType(ObjectType oldObjectType, ObjectType replacement, int data) {
+        EntityObjectData entData = new EntityObjectData(protocol, oldObjectType.getType().name(), oldObjectType.getId(), replacement.getId(), data);
+        objectTypes.put(oldObjectType, entData);
+        return entData;
+    }
+
+    protected @Nullable EntityData getObjectData(ObjectType type) {
+        return objectTypes.get(type);
+    }
+
+    protected void registerRespawn(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT);
+                handler(wrapper -> {
+                    ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+                    clientWorld.setEnvironment(wrapper.get(Type.INT, 0));
+                });
+            }
+        });
+    }
+
+    protected void registerJoinGame(ClientboundPacketType packetType, EntityType playerType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Type.INT); // 2 - Dimension
+                handler(wrapper -> {
+                    ClientWorld clientChunks = wrapper.user().get(ClientWorld.class);
+                    clientChunks.setEnvironment(wrapper.get(Type.INT, 1));
+                    addTrackedEntity(wrapper, wrapper.get(Type.INT, 0), playerType);
+                });
+            }
+        });
+    }
+
+    @Override
+    public void registerMetadataRewriter(ClientboundPacketType packetType, Type<List<Metadata>> oldMetaType, Type<List<Metadata>> newMetaType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                if (oldMetaType != null) {
+                    map(oldMetaType, newMetaType);
+                } else {
+                    map(newMetaType);
+                }
+                handler(wrapper -> {
+                    List<Metadata> metadata = wrapper.get(newMetaType, 0);
+                    handleMetadata(wrapper.get(Type.VAR_INT, 0), metadata, wrapper.user());
+                });
+            }
+        });
+    }
+
+    @Override
+    public void registerMetadataRewriter(ClientboundPacketType packetType, Type<List<Metadata>> metaType) {
+        registerMetadataRewriter(packetType, null, metaType);
+    }
+
+    protected PacketHandler getMobSpawnRewriter(Type<List<Metadata>> metaType) {
+        return wrapper -> {
+            int entityId = wrapper.get(Type.VAR_INT, 0);
+            EntityType type = tracker(wrapper.user()).entityType(entityId);
+
+            List<Metadata> metadata = wrapper.get(metaType, 0);
+            handleMetadata(entityId, metadata, wrapper.user());
+
+            EntityData entityData = entityDataForType(type);
+            if (entityData != null) {
+                wrapper.set(Type.VAR_INT, 1, entityData.replacementId());
+                if (entityData.hasBaseMeta()) {
+                    entityData.defaultMeta().createMeta(new WrappedMetadata(metadata));
+                }
+            }
+        };
+    }
+
+    protected PacketHandler getObjectTrackerHandler() {
+        return wrapper -> addTrackedEntity(wrapper, wrapper.get(Type.VAR_INT, 0), getObjectTypeFromId(wrapper.get(Type.BYTE, 0)));
+    }
+
+    protected PacketHandler getTrackerAndMetaHandler(Type<List<Metadata>> metaType, EntityType entityType) {
+        return wrapper -> {
+            addTrackedEntity(wrapper, wrapper.get(Type.VAR_INT, 0), entityType);
+            List<Metadata> metadata = wrapper.get(metaType, 0);
+            handleMetadata(wrapper.get(Type.VAR_INT, 0), metadata, wrapper.user());
+        };
+    }
+
+    protected PacketHandler getObjectRewriter(Function<Byte, ObjectType> objectGetter) {
+        return wrapper -> {
+            ObjectType type = objectGetter.apply(wrapper.get(Type.BYTE, 0));
+            if (type == null) {
+                ViaBackwards.getPlatform().getLogger().warning("Could not find Entity Type" + wrapper.get(Type.BYTE, 0));
+                return;
+            }
+
+            EntityData data = getObjectData(type);
+            if (data != null) {
+                wrapper.set(Type.BYTE, 0, (byte) data.replacementId());
+                if (data.objectData() != -1) {
+                    wrapper.set(Type.INT, 0, data.objectData());
+                }
+            }
+        };
+    }
+
+    protected EntityType getObjectTypeFromId(int typeId) {
+        return typeFromId(typeId);
+    }
+
+    @Deprecated
+    protected void addTrackedEntity(PacketWrapper wrapper, int entityId, EntityType type) throws Exception {
+        tracker(wrapper.user()).addEntity(entityId, type);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/LegacySoundRewriter.java

@@ -0,0 +1,106 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.rewriter.RewriterBase;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+
+@Deprecated
+public abstract class LegacySoundRewriter<T extends BackwardsProtocol> extends RewriterBase<T> {
+    protected final Int2ObjectMap<SoundData> soundRewrites = new Int2ObjectOpenHashMap<>(64);
+
+    protected LegacySoundRewriter(T protocol) {
+        super(protocol);
+    }
+
+    public SoundData added(int id, int replacement) {
+        return added(id, replacement, -1);
+    }
+
+    public SoundData added(int id, int replacement, float newPitch) {
+        SoundData data = new SoundData(replacement, true, newPitch, true);
+        soundRewrites.put(id, data);
+        return data;
+    }
+
+    public SoundData removed(int id) {
+        SoundData data = new SoundData(-1, false, -1, false);
+        soundRewrites.put(id, data);
+        return data;
+    }
+
+    public int handleSounds(int soundId) {
+        int newSoundId = soundId;
+        SoundData data = soundRewrites.get(soundId);
+        if (data != null) return data.getReplacementSound();
+
+        for (Int2ObjectMap.Entry<SoundData> entry : soundRewrites.int2ObjectEntrySet()) {
+            if (soundId > entry.getIntKey()) {
+                if (entry.getValue().isAdded()) {
+                    newSoundId--;
+                } else {
+                    newSoundId++;
+                }
+            }
+        }
+        return newSoundId;
+    }
+
+    public boolean hasPitch(int soundId) {
+        SoundData data = soundRewrites.get(soundId);
+        return data != null && data.isChangePitch();
+    }
+
+    public float handlePitch(int soundId) {
+        SoundData data = soundRewrites.get(soundId);
+        return data != null ? data.getNewPitch() : 1F;
+    }
+
+    public static final class SoundData {
+        private final int replacementSound;
+        private final boolean changePitch;
+        private final float newPitch;
+        private final boolean added;
+
+        public SoundData(int replacementSound, boolean changePitch, float newPitch, boolean added) {
+            this.replacementSound = replacementSound;
+            this.changePitch = changePitch;
+            this.newPitch = newPitch;
+            this.added = added;
+        }
+
+        public int getReplacementSound() {
+            return replacementSound;
+        }
+
+        public boolean isChangePitch() {
+            return changePitch;
+        }
+
+        public float getNewPitch() {
+            return newPitch;
+        }
+
+        public boolean isAdded() {
+            return added;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/MapColorRewriter.java

@@ -0,0 +1,61 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.rewriter.IdRewriteFunction;
+
+public final class MapColorRewriter {
+
+    /**
+     * Returns a packethandler to rewrite map data color ids. Reading starts from the icon count.
+     *
+     * @param rewriter id rewriter returning mapped colors, or -1 if unmapped
+     * @return packethandler to rewrite map data color ids
+     */
+    public static PacketHandler getRewriteHandler(IdRewriteFunction rewriter) {
+        return wrapper -> {
+            int iconCount = wrapper.passthrough(Type.VAR_INT);
+            for (int i = 0; i < iconCount; i++) {
+                wrapper.passthrough(Type.VAR_INT); // Type
+                wrapper.passthrough(Type.BYTE); // X
+                wrapper.passthrough(Type.BYTE); // Z
+                wrapper.passthrough(Type.BYTE); // Direction
+                if (wrapper.passthrough(Type.BOOLEAN)) {
+                    wrapper.passthrough(Type.COMPONENT); // Display Name
+                }
+            }
+
+            short columns = wrapper.passthrough(Type.UNSIGNED_BYTE);
+            if (columns < 1) return;
+
+            wrapper.passthrough(Type.UNSIGNED_BYTE); // Rows
+            wrapper.passthrough(Type.UNSIGNED_BYTE); // X
+            wrapper.passthrough(Type.UNSIGNED_BYTE); // Z
+            byte[] data = wrapper.passthrough(Type.BYTE_ARRAY_PRIMITIVE);
+            for (int i = 0; i < data.length; i++) {
+                int color = data[i] & 0xFF;
+                int mappedColor = rewriter.rewrite(color);
+                if (mappedColor != -1) {
+                    data[i] = (byte) mappedColor;
+                }
+            }
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/SoundRewriter.java

@@ -0,0 +1,92 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+
+public class SoundRewriter extends com.viaversion.viaversion.rewriter.SoundRewriter {
+
+    private final BackwardsProtocol protocol;
+
+    public SoundRewriter(BackwardsProtocol protocol) {
+        super(protocol);
+        this.protocol = protocol;
+    }
+
+    public void registerNamedSound(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING); // Sound identifier
+                handler(getNamedSoundHandler());
+            }
+        });
+    }
+
+    public void registerStopSound(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(getStopSoundHandler());
+            }
+        });
+    }
+
+    public PacketHandler getNamedSoundHandler() {
+        return wrapper -> {
+            String soundId = wrapper.get(Type.STRING, 0);
+            String mappedId = protocol.getMappingData().getMappedNamedSound(soundId);
+            if (mappedId == null) return;
+            if (!mappedId.isEmpty()) {
+                wrapper.set(Type.STRING, 0, mappedId);
+            } else {
+                wrapper.cancel();
+            }
+        };
+    }
+
+    public PacketHandler getStopSoundHandler() {
+        return wrapper -> {
+            byte flags = wrapper.passthrough(Type.BYTE);
+            if ((flags & 0x02) == 0) return; // No sound specified
+
+            if ((flags & 0x01) != 0) {
+                wrapper.passthrough(Type.VAR_INT); // Source
+            }
+
+            String soundId = wrapper.read(Type.STRING);
+            String mappedId = protocol.getMappingData().getMappedNamedSound(soundId);
+            if (mappedId == null) {
+                // No mapping found
+                wrapper.write(Type.STRING, soundId);
+                return;
+            }
+
+            if (!mappedId.isEmpty()) {
+                wrapper.write(Type.STRING, mappedId);
+            } else {
+                // Cancel if set to empty
+                wrapper.cancel();
+            }
+        };
+    }
+}

common/src/main/java/com/viaversion/viabackwards/api/rewriters/TranslatableRewriter.java

@@ -0,0 +1,144 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.api.rewriters;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.VBMappingDataLoader;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.State;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class TranslatableRewriter extends ComponentRewriter {
+
+    private static final Map<String, Map<String, String>> TRANSLATABLES = new HashMap<>();
+    protected final Map<String, String> newTranslatables;
+
+    public static void loadTranslatables() {
+        JsonObject jsonObject = VBMappingDataLoader.loadData("translation-mappings.json");
+        for (Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
+            Map<String, String> versionMappings = new HashMap<>();
+            TRANSLATABLES.put(entry.getKey(), versionMappings);
+            for (Map.Entry<String, JsonElement> translationEntry : entry.getValue().getAsJsonObject().entrySet()) {
+                versionMappings.put(translationEntry.getKey(), translationEntry.getValue().getAsString());
+            }
+        }
+    }
+
+    public TranslatableRewriter(BackwardsProtocol protocol) {
+        this(protocol, protocol.getClass().getSimpleName().split("To")[1].replace("_", "."));
+    }
+
+    public TranslatableRewriter(BackwardsProtocol protocol, String sectionIdentifier) {
+        super(protocol);
+        final Map<String, String> newTranslatables = TRANSLATABLES.get(sectionIdentifier);
+        if (newTranslatables == null) {
+            ViaBackwards.getPlatform().getLogger().warning("Error loading " + sectionIdentifier + " translatables!");
+            this.newTranslatables = new HashMap<>();
+        } else {
+            this.newTranslatables = newTranslatables;
+        }
+    }
+
+    public void registerPing() {
+        protocol.registerClientbound(State.LOGIN, 0x00, 0x00, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    public void registerDisconnect(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    public void registerChatMessage(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    public void registerLegacyOpenWindow(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // Id
+                map(Type.STRING); // Window Type
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    public void registerOpenWindow(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // Id
+                map(Type.VAR_INT); // Window Type
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    public void registerTabList(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    processText(wrapper.passthrough(Type.COMPONENT));
+                    processText(wrapper.passthrough(Type.COMPONENT));
+                });
+            }
+        });
+    }
+
+    public void registerCombatKill(ClientboundPacketType packetType) {
+        protocol.registerClientbound(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.INT);
+                handler(wrapper -> processText(wrapper.passthrough(Type.COMPONENT)));
+            }
+        });
+    }
+
+    @Override
+    protected void handleTranslate(JsonObject root, String translate) {
+        String newTranslate = newTranslatables.get(translate);
+        if (newTranslate != null) {
+            root.addProperty("translate", newTranslate);
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/PotionSplashHandler.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+
+public class PotionSplashHandler {
+
+    private static final Int2IntMap DATA = new Int2IntOpenHashMap(14, 0.99F);
+
+    static {
+        DATA.defaultReturnValue(-1);
+        DATA.put(2039713, 5); // night vision
+        DATA.put(8356754, 7); // invisibility
+        DATA.put(2293580, 9); // jump boost
+        DATA.put(14981690, 12); // fire resistance
+        DATA.put(8171462, 14); // swiftness
+        DATA.put(5926017, 17); // slowness
+        DATA.put(3035801, 19); // water breathing
+        DATA.put(16262179, 21); // instant health
+        DATA.put(4393481, 23); // instant damage
+        DATA.put(5149489, 25); // poison
+        DATA.put(13458603, 28); // regeneration
+        DATA.put(9643043, 31); // strength
+        DATA.put(4738376, 34); // weakness
+        DATA.put(3381504, 36); // luck
+    }
+
+    public static int getOldData(int data) {
+        return DATA.get(data);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/Protocol1_10To1_11.java

@@ -0,0 +1,89 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappings;
+import com.viaversion.viabackwards.api.rewriters.SoundRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets.BlockItemPackets1_11;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets.EntityPackets1_11;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets.PlayerPackets1_11;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage.WindowTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_11Types;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+
+public class Protocol1_10To1_11 extends BackwardsProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9_3, ServerboundPackets1_9_3, ServerboundPackets1_9_3> {
+
+    public static final BackwardsMappings MAPPINGS = new BackwardsMappings("1.11", "1.10", null, true);
+    private final EntityPackets1_11 entityPackets = new EntityPackets1_11(this); // Required for the item rewriter
+    private BlockItemPackets1_11 blockItemPackets;
+
+    public Protocol1_10To1_11() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9_3.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        (blockItemPackets = new BlockItemPackets1_11(this)).register();
+        entityPackets.register();
+        new PlayerPackets1_11().register(this);
+
+        SoundRewriter soundRewriter = new SoundRewriter(this);
+        soundRewriter.registerNamedSound(ClientboundPackets1_9_3.NAMED_SOUND);
+        soundRewriter.registerSound(ClientboundPackets1_9_3.SOUND);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        // Register ClientWorld
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld(user));
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, Entity1_11Types.EntityType.PLAYER, true));
+
+        if (!user.has(WindowTracker.class)) {
+            user.put(new WindowTracker());
+        }
+    }
+
+    @Override
+    public BackwardsMappings getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPackets1_11 getEntityRewriter() {
+        return entityPackets;
+    }
+
+    @Override
+    public BlockItemPackets1_11 getItemRewriter() {
+        return blockItemPackets;
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        return true;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/BlockItemPackets1_11.java

@@ -0,0 +1,458 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets;
+
+import com.viaversion.viabackwards.api.data.MappedLegacyBlockItem;
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.api.rewriters.LegacyEnchantmentRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.Protocol1_10To1_11;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage.ChestedHorseStorage;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage.WindowTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.entity.EntityTracker;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_11Types;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_11to1_10.EntityIdRewriter;
+import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+
+import java.util.Arrays;
+import java.util.Optional;
+
+public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<Protocol1_10To1_11> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public BlockItemPackets1_11(Protocol1_10To1_11 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.SET_SLOT, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.SHORT); // 1 - Slot ID
+                map(Type.ITEM); // 2 - Slot Value
+
+                handler(itemToClientHandler(Type.ITEM));
+
+                // Handle Llama
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (isLlama(wrapper.user())) {
+                            Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                            if (!horse.isPresent())
+                                return;
+                            ChestedHorseStorage storage = horse.get();
+                            int currentSlot = wrapper.get(Type.SHORT, 0);
+                            wrapper.set(Type.SHORT, 0, ((Integer) (currentSlot = getNewSlotId(storage, currentSlot))).shortValue());
+                            wrapper.set(Type.ITEM, 0, getNewItem(storage, currentSlot, wrapper.get(Type.ITEM, 0)));
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.WINDOW_ITEMS, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.ITEM_ARRAY); // 1 - Window Values
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        Item[] stacks = wrapper.get(Type.ITEM_ARRAY, 0);
+                        for (int i = 0; i < stacks.length; i++)
+                            stacks[i] = handleItemToClient(stacks[i]);
+
+                        if (isLlama(wrapper.user())) {
+                            Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                            if (!horse.isPresent())
+                                return;
+                            ChestedHorseStorage storage = horse.get();
+                            stacks = Arrays.copyOf(stacks, !storage.isChested() ? 38 : 53);
+
+                            for (int i = stacks.length - 1; i >= 0; i--) {
+                                stacks[getNewSlotId(storage, i)] = stacks[i];
+                                stacks[i] = getNewItem(storage, i, stacks[i]);
+                            }
+                            wrapper.set(Type.ITEM_ARRAY, 0, stacks);
+                        }
+                    }
+                });
+            }
+        });
+
+        registerEntityEquipment(ClientboundPackets1_9_3.ENTITY_EQUIPMENT, Type.ITEM);
+
+        // Plugin message Packet -> Trading
+        protocol.registerClientbound(ClientboundPackets1_9_3.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
+                            wrapper.passthrough(Type.INT); // Passthrough Window ID
+
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                            for (int i = 0; i < size; i++) {
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
+
+                                boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                                if (secondItem) {
+                                    wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Second Item
+                                }
+
+                                wrapper.passthrough(Type.BOOLEAN); // Trade disabled
+                                wrapper.passthrough(Type.INT); // Number of tools uses
+                                wrapper.passthrough(Type.INT); // Maximum number of trade uses
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLICK_WINDOW, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.SHORT); // 1 - Slot
+                map(Type.BYTE); // 2 - Button
+                map(Type.SHORT); // 3 - Action number
+                map(Type.VAR_INT); // 4 - Mode
+                map(Type.ITEM); // 5 - Clicked Item
+
+                handler(itemToServerHandler(Type.ITEM));
+
+                // Llama slot
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (isLlama(wrapper.user())) {
+                            Optional<ChestedHorseStorage> horse = getChestedHorse(wrapper.user());
+                            if (!horse.isPresent())
+                                return;
+                            ChestedHorseStorage storage = horse.get();
+                            int clickSlot = wrapper.get(Type.SHORT, 0);
+                            int correctSlot = getOldSlotId(storage, clickSlot);
+
+                            wrapper.set(Type.SHORT, 0, ((Integer) correctSlot).shortValue());
+                        }
+                    }
+                });
+            }
+        });
+
+        registerCreativeInvAction(ServerboundPackets1_9_3.CREATIVE_INVENTORY_ACTION, Type.ITEM);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CHUNK_DATA, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+                        Chunk1_9_3_4Type type = new Chunk1_9_3_4Type(clientWorld); // Use the 1.10 Chunk type since nothing changed.
+                        Chunk chunk = wrapper.passthrough(type);
+
+                        handleChunk(chunk);
+
+                        // only patch it for signs for now
+                        for (CompoundTag tag : chunk.getBlockEntities()) {
+                            Tag idTag = tag.get("id");
+                            if (!(idTag instanceof StringTag)) continue;
+
+                            String id = (String) idTag.getValue();
+                            if (id.equals("minecraft:sign")) {
+                                ((StringTag) idTag).setValue("Sign");
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_CHANGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.POSITION); // 0 - Block Position
+                map(Type.VAR_INT); // 1 - Block
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int idx = wrapper.get(Type.VAR_INT, 0);
+                        wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Chunk X
+                map(Type.INT); // 1 - Chunk Z
+                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
+                            record.setBlockId(handleBlockID(record.getBlockId()));
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.POSITION); // 0 - Position
+                map(Type.UNSIGNED_BYTE); // 1 - Action
+                map(Type.NBT); // 2 - NBT
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        // Remove on shulkerbox decleration
+                        if (wrapper.get(Type.UNSIGNED_BYTE, 0) == 10) {
+                            wrapper.cancel();
+                        }
+                        // Handler Spawners
+                        if (wrapper.get(Type.UNSIGNED_BYTE, 0) == 1) {
+                            CompoundTag tag = wrapper.get(Type.NBT, 0);
+                            EntityIdRewriter.toClientSpawner(tag, true);
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.OPEN_WINDOW, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.STRING); // 1 - Window Type
+                map(Type.COMPONENT); // 2 - Title
+                map(Type.UNSIGNED_BYTE); // 3 - Slots
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int entityId = -1;
+                        // Passthrough Entity ID
+                        if (wrapper.get(Type.STRING, 0).equals("EntityHorse")) {
+                            entityId = wrapper.passthrough(Type.INT);
+                        }
+
+                        // Track Inventory
+                        String inventory = wrapper.get(Type.STRING, 0);
+                        WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                        windowTracker.setInventory(inventory);
+                        windowTracker.setEntityId(entityId);
+
+                        // Change llama slotcount to the donkey one
+                        if (isLlama(wrapper.user())) {
+                            wrapper.set(Type.UNSIGNED_BYTE, 1, (short) 17);
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CLOSE_WINDOW, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                // Inventory tracking
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                        windowTracker.setInventory(null);
+                        windowTracker.setEntityId(-1);
+                    }
+                });
+            }
+        });
+
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLOSE_WINDOW, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                // Inventory tracking
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                        windowTracker.setInventory(null);
+                        windowTracker.setEntityId(-1);
+                    }
+                });
+            }
+        });
+
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.metaType().type().equals(Type.ITEM)) // Is Item
+                meta.setValue(handleItemToClient((Item) meta.getValue()));
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle spawner block entity (map to itself with custom handler)
+        MappedLegacyBlockItem data = replacementData.computeIfAbsent(52, s -> new MappedLegacyBlockItem(52, (short) -1, null, false));
+        data.setBlockEntityHandler((b, tag) -> {
+            EntityIdRewriter.toClientSpawner(tag, true);
+            return tag;
+        });
+
+        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName);
+        enchantmentRewriter.registerEnchantment(71, "§cCurse of Vanishing");
+        enchantmentRewriter.registerEnchantment(10, "§cCurse of Binding");
+
+        enchantmentRewriter.setHideLevelForEnchants(71, 10); // Curses do not display their level
+    }
+
+    @Override
+    public Item handleItemToClient(Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        // Rewrite spawn eggs (id checks are done in the method itself)
+        EntityIdRewriter.toClientItem(item, true);
+
+        if (tag.get("ench") instanceof ListTag) {
+            enchantmentRewriter.rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.get("StoredEnchantments") instanceof ListTag) {
+            enchantmentRewriter.rewriteEnchantmentsToClient(tag, true);
+        }
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        // Rewrite spawn eggs (id checks are done in the method itself)
+        EntityIdRewriter.toServerItem(item, true);
+
+        if (tag.contains(nbtTagName + "|ench")) {
+            enchantmentRewriter.rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(nbtTagName + "|StoredEnchantments")) {
+            enchantmentRewriter.rewriteEnchantmentsToServer(tag, true);
+        }
+        return item;
+    }
+
+    private boolean isLlama(UserConnection user) {
+        WindowTracker tracker = user.get(WindowTracker.class);
+        if (tracker.getInventory() != null && tracker.getInventory().equals("EntityHorse")) {
+            EntityTracker entTracker = user.getEntityTracker(Protocol1_10To1_11.class);
+            StoredEntityData entityData = entTracker.entityData(tracker.getEntityId());
+            return entityData != null && entityData.type().is(Entity1_11Types.EntityType.LIAMA);
+        }
+        return false;
+    }
+
+    private Optional<ChestedHorseStorage> getChestedHorse(UserConnection user) {
+        WindowTracker tracker = user.get(WindowTracker.class);
+        if (tracker.getInventory() != null && tracker.getInventory().equals("EntityHorse")) {
+            EntityTracker entTracker = user.getEntityTracker(Protocol1_10To1_11.class);
+            StoredEntityData entityData = entTracker.entityData(tracker.getEntityId());
+            if (entityData != null)
+                return Optional.of(entityData.get(ChestedHorseStorage.class));
+        }
+        return Optional.empty();
+    }
+
+    private int getNewSlotId(ChestedHorseStorage storage, int slotId) {
+        int totalSlots = !storage.isChested() ? 38 : 53;
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int offsetForm = 15 - (3 * strength);
+
+        if (slotId >= startNonExistingFormula && totalSlots > (slotId + offsetForm))
+            return offsetForm + slotId;
+        if (slotId == 1)
+            return 0;
+        return slotId;
+    }
+
+    private int getOldSlotId(ChestedHorseStorage storage, int slotId) {
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int endNonExistingFormula = 2 + 3 * (storage.isChested() ? 5 : 0);
+        int offsetForm = endNonExistingFormula - startNonExistingFormula;
+
+        if (slotId == 1 || slotId >= startNonExistingFormula && slotId < endNonExistingFormula)
+            return 0;
+        if (slotId >= endNonExistingFormula)
+            return slotId - offsetForm;
+        if (slotId == 0)
+            return 1;
+        return slotId;
+    }
+
+    private Item getNewItem(ChestedHorseStorage storage, int slotId, Item current) {
+        int strength = storage.isChested() ? storage.getLiamaStrength() : 0;
+        int startNonExistingFormula = 2 + 3 * strength;
+        int endNonExistingFormula = 2 + 3 * (storage.isChested() ? 5 : 0);
+
+        if (slotId >= startNonExistingFormula && slotId < endNonExistingFormula)
+            return new DataItem(166, (byte) 1, (short) 0, getNamedTag("§4SLOT DISABLED"));
+        if (slotId == 1)
+            return null;
+        return current;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/EntityPackets1_11.java

@@ -0,0 +1,412 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets;
+
+import com.viaversion.viabackwards.api.entities.storage.EntityData;
+import com.viaversion.viabackwards.api.entities.storage.WrappedMetadata;
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.PotionSplashHandler;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.Protocol1_10To1_11;
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage.ChestedHorseStorage;
+import com.viaversion.viabackwards.utils.Block;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_11Types;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_12Types;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_9;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_9;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+
+import java.util.List;
+import java.util.Optional;
+
+public class EntityPackets1_11 extends LegacyEntityRewriter<Protocol1_10To1_11> {
+
+    public EntityPackets1_11(Protocol1_10To1_11 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.EFFECT, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT);
+                map(Type.POSITION);
+                map(Type.INT);
+                handler(wrapper -> {
+                    int type = wrapper.get(Type.INT, 0);
+                    if (type == 2002 || type == 2007) {
+                        // 2007 potion id doesn't exist in 1.10
+                        if (type == 2007) {
+                            wrapper.set(Type.INT, 0, 2002);
+                        }
+
+                        int mappedData = PotionSplashHandler.getOldData(wrapper.get(Type.INT, 1));
+                        if (mappedData != -1) {
+                            wrapper.set(Type.INT, 1, mappedData);
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_ENTITY, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.BYTE); // 2 - Type
+                map(Type.DOUBLE); // 3 - x
+                map(Type.DOUBLE); // 4 - y
+                map(Type.DOUBLE); // 5 - z
+                map(Type.BYTE); // 6 - Pitch
+                map(Type.BYTE); // 7 - Yaw
+                map(Type.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(id -> Entity1_11Types.ObjectType.findById(id).orElse(null)));
+
+                // Handle FallingBlock blocks
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        Optional<Entity1_12Types.ObjectType> type = Entity1_12Types.ObjectType.findById(wrapper.get(Type.BYTE, 0));
+                        if (type.isPresent() && type.get() == Entity1_12Types.ObjectType.FALLING_BLOCK) {
+                            int objectData = wrapper.get(Type.INT, 0);
+                            int objType = objectData & 4095;
+                            int data = objectData >> 12 & 15;
+
+                            Block block = protocol.getItemRewriter().handleBlock(objType, data);
+                            if (block == null)
+                                return;
+
+                            wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
+                        }
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_EXPERIENCE_ORB, Entity1_11Types.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.SPAWN_GLOBAL_ENTITY, Entity1_11Types.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_MOB, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.VAR_INT, Type.UNSIGNED_BYTE); // 2 - Entity Type
+                map(Type.DOUBLE); // 3 - X
+                map(Type.DOUBLE); // 4 - Y
+                map(Type.DOUBLE); // 5 - Z
+                map(Type.BYTE); // 6 - Yaw
+                map(Type.BYTE); // 7 - Pitch
+                map(Type.BYTE); // 8 - Head Pitch
+                map(Type.SHORT); // 9 - Velocity X
+                map(Type.SHORT); // 10 - Velocity Y
+                map(Type.SHORT); // 11 - Velocity Z
+                map(Types1_9.METADATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler(Type.UNSIGNED_BYTE, 0));
+
+                // Rewrite entity type / metadata
+                handler(wrapper -> {
+                    int entityId = wrapper.get(Type.VAR_INT, 0);
+                    EntityType type = tracker(wrapper.user()).entityType(entityId);
+
+                    List<Metadata> list = wrapper.get(Types1_9.METADATA_LIST, 0);
+                    handleMetadata(wrapper.get(Type.VAR_INT, 0), list, wrapper.user());
+
+                    EntityData entityData = entityDataForType(type);
+                    if (entityData != null) {
+                        wrapper.set(Type.UNSIGNED_BYTE, 0, (short) entityData.replacementId());
+                        if (entityData.hasBaseMeta()) {
+                            entityData.defaultMeta().createMeta(new WrappedMetadata(list));
+                        }
+                    }
+
+                    // Sub 1.11 clients will error if the list is empty
+                    if (list.isEmpty()) {
+                        list.add(new Metadata(0, MetaType1_9.Byte, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_PAINTING, Entity1_11Types.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.JOIN_GAME, Entity1_11Types.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_PLAYER, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                map(Type.UUID); // 1 - Player UUID
+                map(Type.DOUBLE); // 2 - X
+                map(Type.DOUBLE); // 3 - Y
+                map(Type.DOUBLE); // 4 - Z
+                map(Type.BYTE); // 5 - Yaw
+                map(Type.BYTE); // 6 - Pitch
+                map(Types1_9.METADATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_9.METADATA_LIST, Entity1_11Types.EntityType.PLAYER));
+                handler(wrapper -> {
+                    // Sub 1.11 clients will cry if the list is empty
+                    List<Metadata> metadata = wrapper.get(Types1_9.METADATA_LIST, 0);
+                    if (metadata.isEmpty()) {
+                        metadata.add(new Metadata(0, MetaType1_9.Byte, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.DESTROY_ENTITIES);
+        registerMetadataRewriter(ClientboundPackets1_9_3.ENTITY_METADATA, Types1_9.METADATA_LIST);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.ENTITY_STATUS, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.BYTE); // 1 - Entity Status
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        byte b = wrapper.get(Type.BYTE, 0);
+
+                        if (b == 35) {
+                            wrapper.clearPacket();
+                            wrapper.setId(0x1E); // Change Game State
+                            wrapper.write(Type.UNSIGNED_BYTE, (short) 10); // Play Elder Guardian animation
+                            wrapper.write(Type.FLOAT, 0F);
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Guardian
+        mapEntityTypeWithData(Entity1_11Types.EntityType.ELDER_GUARDIAN, Entity1_11Types.EntityType.GUARDIAN);
+        // Skeletons
+        mapEntityTypeWithData(Entity1_11Types.EntityType.WITHER_SKELETON, Entity1_11Types.EntityType.SKELETON).plainName().spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(1)));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.STRAY, Entity1_11Types.EntityType.SKELETON).plainName().spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(2)));
+        // Zombies
+        mapEntityTypeWithData(Entity1_11Types.EntityType.HUSK, Entity1_11Types.EntityType.ZOMBIE).plainName().spawnMetadata(storage -> handleZombieType(storage, 6));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.ZOMBIE_VILLAGER, Entity1_11Types.EntityType.ZOMBIE).spawnMetadata(storage -> handleZombieType(storage, 1));
+        // Horses
+        mapEntityTypeWithData(Entity1_11Types.EntityType.HORSE, Entity1_11Types.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(0))); // Nob able to ride the horse without having the MetaType sent.
+        mapEntityTypeWithData(Entity1_11Types.EntityType.DONKEY, Entity1_11Types.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.MULE, Entity1_11Types.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(2)));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.SKELETON_HORSE, Entity1_11Types.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(4)));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.ZOMBIE_HORSE, Entity1_11Types.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(3)));
+        // New mobs
+        mapEntityTypeWithData(Entity1_11Types.EntityType.EVOCATION_FANGS, Entity1_11Types.EntityType.SHULKER);
+        mapEntityTypeWithData(Entity1_11Types.EntityType.EVOCATION_ILLAGER, Entity1_11Types.EntityType.VILLAGER).plainName();
+        mapEntityTypeWithData(Entity1_11Types.EntityType.VEX, Entity1_11Types.EntityType.BAT).plainName();
+        mapEntityTypeWithData(Entity1_11Types.EntityType.VINDICATION_ILLAGER, Entity1_11Types.EntityType.VILLAGER).plainName().spawnMetadata(storage -> storage.add(new Metadata(13, MetaType1_9.VarInt, 4))); // Base Profession
+        mapEntityTypeWithData(Entity1_11Types.EntityType.LIAMA, Entity1_11Types.EntityType.HORSE).plainName().spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(Entity1_11Types.EntityType.LIAMA_SPIT, Entity1_11Types.EntityType.SNOWBALL);
+
+        mapObjectType(Entity1_11Types.ObjectType.LIAMA_SPIT, Entity1_11Types.ObjectType.SNOWBALL, -1);
+        // Replace with endertorchthingies
+        mapObjectType(Entity1_11Types.ObjectType.EVOCATION_FANGS, Entity1_11Types.ObjectType.FALLING_BLOCK, 198 | 1 << 12);
+
+        // Handle ElderGuardian & target metadata
+        filter().filterFamily(Entity1_11Types.EntityType.GUARDIAN).index(12).handler((event, meta) -> {
+            boolean b = (boolean) meta.getValue();
+            int bitmask = b ? 0x02 : 0;
+
+            if (event.entityType() == Entity1_11Types.EntityType.ELDER_GUARDIAN) {
+                bitmask |= 0x04;
+            }
+
+            meta.setTypeAndValue(MetaType1_9.Byte, (byte) bitmask);
+        });
+
+        // Handle skeleton swing
+        filter().filterFamily(Entity1_11Types.EntityType.ABSTRACT_SKELETON).index(12).toIndex(13);
+
+        /*
+            ZOMBIE CHANGES
+         */
+        filter().filterFamily(Entity1_11Types.EntityType.ZOMBIE).handler((event, meta) -> {
+            switch (meta.id()) {
+                case 13:
+                    event.cancel();
+                    return;
+                case 14:
+                    event.setIndex(15);
+                    break;
+                case 15:
+                    event.setIndex(14);
+                    break;
+                // Profession
+                case 16:
+                    event.setIndex(13);
+                    meta.setValue(1 + (int) meta.getValue());
+                    break;
+            }
+        });
+
+        // Handle Evocation Illager
+        filter().type(Entity1_11Types.EntityType.EVOCATION_ILLAGER).index(12).handler((event, meta) -> {
+            event.setIndex(13);
+            meta.setTypeAndValue(MetaType1_9.VarInt, ((Byte) meta.getValue()).intValue()); // Change the profession for the states
+        });
+
+        // Handle Vex (Remove this field completely since the position is not updated correctly when idling for bats. Sad ):
+        filter().type(Entity1_11Types.EntityType.VEX).index(12).handler((event, meta) -> {
+            meta.setValue((byte) 0x00);
+        });
+
+        // Handle VindicationIllager
+        filter().type(Entity1_11Types.EntityType.VINDICATION_ILLAGER).index(12).handler((event, meta) -> {
+            event.setIndex(13);
+            meta.setTypeAndValue(MetaType1_9.VarInt, ((Number) meta.getValue()).intValue() == 1 ? 2 : 4);
+        });
+
+        /*
+            HORSES
+         */
+
+        // Handle horse flags
+        filter().filterFamily(Entity1_11Types.EntityType.ABSTRACT_HORSE).index(13).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            byte b = (byte) meta.getValue();
+            if (data.has(ChestedHorseStorage.class) && data.get(ChestedHorseStorage.class).isChested()) {
+                b |= 0x08; // Chested
+                meta.setValue(b);
+            }
+        });
+
+        // Create chested horse storage
+        filter().filterFamily(Entity1_11Types.EntityType.CHESTED_HORSE).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ChestedHorseStorage.class)) {
+                data.put(new ChestedHorseStorage());
+            }
+        });
+
+        // Handle horse armor
+        filter().type(Entity1_11Types.EntityType.HORSE).index(16).toIndex(17);
+
+        // Handle chested horse
+        filter().filterFamily(Entity1_11Types.EntityType.CHESTED_HORSE).index(15).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ChestedHorseStorage storage = data.get(ChestedHorseStorage.class);
+            boolean b = (boolean) meta.getValue();
+            storage.setChested(b);
+            event.cancel();
+        });
+
+        // Get rid of Liama metadata
+        filter().type(Entity1_11Types.EntityType.LIAMA).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ChestedHorseStorage storage = data.get(ChestedHorseStorage.class);
+
+            int index = event.index();
+            // Store them for later (:
+            switch (index) {
+                case 16:
+                    storage.setLiamaStrength((int) meta.getValue());
+                    event.cancel();
+                    break;
+                case 17:
+                    storage.setLiamaCarpetColor((int) meta.getValue());
+                    event.cancel();
+                    break;
+                case 18:
+                    storage.setLiamaVariant((int) meta.getValue());
+                    event.cancel();
+                    break;
+            }
+        });
+
+        // Handle Horse (Correct owner)
+        filter().filterFamily(Entity1_11Types.EntityType.ABSTRACT_HORSE).index(14).toIndex(16);
+
+        // Handle villager - Change non-existing profession
+        filter().type(Entity1_11Types.EntityType.VILLAGER).index(13).handler((event, meta) -> {
+            if ((int) meta.getValue() == 5) {
+                meta.setValue(0);
+            }
+        });
+
+        // handle new Shulker color meta
+        filter().type(Entity1_11Types.EntityType.SHULKER).cancel(15);
+    }
+
+    /*
+        0 - Skeleton
+        1 - Wither Skeleton
+        2 - Stray
+     */
+
+    private Metadata getSkeletonTypeMeta(int type) {
+        return new Metadata(12, MetaType1_9.VarInt, type);
+    }
+
+    /*
+        0 - Zombie
+        1-5 - Villager with profession
+        6 - Husk
+     */
+    private Metadata getZombieTypeMeta(int type) {
+        return new Metadata(13, MetaType1_9.VarInt, type);
+    }
+
+    private void handleZombieType(WrappedMetadata storage, int type) {
+        Metadata meta = storage.get(13);
+        if (meta == null) {
+            storage.add(getZombieTypeMeta(type));
+        }
+    }
+
+    /*
+        Horse 0
+        Donkey 1
+        Mule 2
+        Zombie horse 3
+        Skeleton horse 4
+    */
+    private Metadata getHorseMetaType(int type) {
+        return new Metadata(14, MetaType1_9.VarInt, type);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return Entity1_11Types.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    protected EntityType getObjectTypeFromId(int typeId) {
+        return Entity1_11Types.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/packets/PlayerPackets1_11.java

@@ -0,0 +1,94 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11.packets;
+
+import com.viaversion.viabackwards.protocol.protocol1_10to1_11.Protocol1_10To1_11;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.protocol.remapper.ValueTransformer;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.kyori.adventure.text.serializer.gson.GsonComponentSerializer;
+import com.viaversion.viaversion.libs.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+
+public class PlayerPackets1_11 {
+    private static final ValueTransformer<Short, Float> TO_NEW_FLOAT = new ValueTransformer<Short, Float>(Type.FLOAT) {
+        @Override
+        public Float transform(PacketWrapper wrapper, Short inputValue) throws Exception {
+            return inputValue / 15f;
+        }
+    };
+
+    public void register(Protocol1_10To1_11 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_9_3.TITLE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Action
+
+                handler(wrapper -> {
+                    int action = wrapper.get(Type.VAR_INT, 0);
+
+                    if (action == 2) { // Handle the new ActionBar
+                        JsonElement message = wrapper.read(Type.COMPONENT);
+
+                        wrapper.clearPacket();
+                        wrapper.setId(ClientboundPackets1_9_3.CHAT_MESSAGE.ordinal());
+
+                        // https://bugs.mojang.com/browse/MC-119145to
+                        String legacy = LegacyComponentSerializer.legacySection().serialize(GsonComponentSerializer.gson().deserialize(message.toString()));
+                        message = new JsonObject();
+                        message.getAsJsonObject().addProperty("text", legacy);
+
+                        wrapper.write(Type.COMPONENT, message);
+                        wrapper.write(Type.BYTE, (byte) 2);
+                    } else if (action > 2) {
+                        wrapper.set(Type.VAR_INT, 0, action - 1); // Move everything one position down
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.COLLECT_ITEM, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Collected entity id
+                map(Type.VAR_INT); // 1 - Collector entity id
+
+                handler(wrapper -> wrapper.read(Type.VAR_INT)); // Ignore item pickup count
+            }
+        });
+
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.PLAYER_BLOCK_PLACEMENT, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.POSITION); // 0 - Location
+                map(Type.VAR_INT); // 1 - Face
+                map(Type.VAR_INT); // 2 - Hand
+
+                map(Type.UNSIGNED_BYTE, TO_NEW_FLOAT);
+                map(Type.UNSIGNED_BYTE, TO_NEW_FLOAT);
+                map(Type.UNSIGNED_BYTE, TO_NEW_FLOAT);
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/storage/ChestedHorseStorage.java

@@ -0,0 +1,63 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage;
+
+public class ChestedHorseStorage {
+    private boolean chested;
+    private int liamaStrength;
+    private int liamaCarpetColor = -1;
+    private int liamaVariant;
+
+    public boolean isChested() {
+        return chested;
+    }
+
+    public void setChested(boolean chested) {
+        this.chested = chested;
+    }
+
+    public int getLiamaStrength() {
+        return liamaStrength;
+    }
+
+    public void setLiamaStrength(int liamaStrength) {
+        this.liamaStrength = liamaStrength;
+    }
+
+    public int getLiamaCarpetColor() {
+        return liamaCarpetColor;
+    }
+
+    public void setLiamaCarpetColor(int liamaCarpetColor) {
+        this.liamaCarpetColor = liamaCarpetColor;
+    }
+
+    public int getLiamaVariant() {
+        return liamaVariant;
+    }
+
+    public void setLiamaVariant(int liamaVariant) {
+        this.liamaVariant = liamaVariant;
+    }
+
+    @Override
+    public String toString() {
+        return "ChestedHorseStorage{" + "chested=" + chested + ", liamaStrength=" + liamaStrength + ", liamaCarpetColor=" + liamaCarpetColor + ", liamaVariant=" + liamaVariant + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_10to1_11/storage/WindowTracker.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_10to1_11.storage;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+
+public class WindowTracker implements StorableObject {
+    private String inventory;
+    private int entityId = -1;
+
+    public String getInventory() {
+        return inventory;
+    }
+
+    public void setInventory(String inventory) {
+        this.inventory = inventory;
+    }
+
+    public int getEntityId() {
+        return entityId;
+    }
+
+    public void setEntityId(int entityId) {
+        this.entityId = entityId;
+    }
+
+    @Override
+    public String toString() {
+        return "WindowTracker{" + "inventory='" + inventory + '\'' + ", entityId=" + entityId + '}';
+    }
+}
+

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/Protocol1_11_1To1_12.java

@@ -0,0 +1,112 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.data.BackwardsMappings;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.ShoulderTracker;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets.BlockItemPackets1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets.ChatPackets1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets.EntityPackets1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets.SoundPackets1_12;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_12Types;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ServerboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
+
+public class Protocol1_11_1To1_12 extends BackwardsProtocol<ClientboundPackets1_12, ClientboundPackets1_9_3, ServerboundPackets1_12, ServerboundPackets1_9_3> {
+
+    private static final BackwardsMappings MAPPINGS = new BackwardsMappings("1.12", "1.11", null, true) {
+        @Override
+        protected boolean shouldWarnOnMissing(final String key) {
+            return super.shouldWarnOnMissing(key) && !key.equals("sounds");
+        }
+    };
+    private final EntityPackets1_12 entityPackets = new EntityPackets1_12(this);
+    private final BlockItemPackets1_12 blockItemPackets = new BlockItemPackets1_12(this);
+
+    public Protocol1_11_1To1_12() {
+        super(ClientboundPackets1_12.class, ClientboundPackets1_9_3.class, ServerboundPackets1_12.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        blockItemPackets.register();
+        entityPackets.register();
+        new SoundPackets1_12(this).register();
+        new ChatPackets1_12(this).register();
+
+        registerClientbound(ClientboundPackets1_12.TITLE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    int action = wrapper.passthrough(Type.VAR_INT);
+                    if (action >= 0 && action <= 2) {
+                        JsonElement component = wrapper.read(Type.COMPONENT);
+                        wrapper.write(Type.COMPONENT, Protocol1_9To1_8.fixJson(component.toString()));
+                    }
+                });
+            }
+        });
+
+        cancelClientbound(ClientboundPackets1_12.ADVANCEMENTS);
+        cancelClientbound(ClientboundPackets1_12.UNLOCK_RECIPES);
+        cancelClientbound(ClientboundPackets1_12.SELECT_ADVANCEMENTS_TAB);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        // Register ClientWorld
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld(user));
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, Entity1_12Types.EntityType.PLAYER, true));
+
+        user.put(new ShoulderTracker(user));
+    }
+
+    @Override
+    public BackwardsMappings getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPackets1_12 getEntityRewriter() {
+        return entityPackets;
+    }
+
+    @Override
+    public BlockItemPackets1_12 getItemRewriter() {
+        return blockItemPackets;
+    }
+
+    @Override
+    public boolean hasMappingDataToLoad() {
+        return true;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/data/AdvancementTranslations.java

@@ -1,20 +1,28 @@
 /*
- * Copyright (c) 2016 Matsv
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
  *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
  *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package nl.matsv.viabackwards.protocol.protocol1_12to1_11_1.data;
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data;
 
+import java.util.HashMap;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
 
 public class AdvancementTranslations {
-    private static final Map<String, String> advancements = new ConcurrentHashMap<>();
+    private static final Map<String, String> advancements = new HashMap<>();
 
     static {
         add("advancements.nether.get_wither_skull.title", "Spooky Scary Skeleton");
@@ -140,10 +148,6 @@ public class AdvancementTranslations {
         advancements.put(key, value);
     }
 
-    public static boolean has(String key) {
-        return advancements.containsKey(key);
-    }
-
     public static String get(String key) {
         return advancements.get(key);
     }

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/data/BlockColors.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data;
+
+public class BlockColors {
+    private static final String[] COLORS = new String[16];
+
+    static {
+        COLORS[0] = "White";
+        COLORS[1] = "Orange";
+        COLORS[2] = "Magenta";
+        COLORS[3] = "Light Blue";
+        COLORS[4] = "Yellow";
+        COLORS[5] = "Lime";
+        COLORS[6] = "Pink";
+        COLORS[7] = "Gray";
+        COLORS[8] = "Light Gray";
+        COLORS[9] = "Cyan";
+        COLORS[10] = "Purple";
+        COLORS[11] = "Blue";
+        COLORS[12] = "Brown";
+        COLORS[13] = "Green";
+        COLORS[14] = "Red";
+        COLORS[15] = "Black";
+    }
+
+    public static String get(int key) {
+        return key >= 0 && key < COLORS.length ? COLORS[key] : "Unknown color";
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/data/MapColorMapping.java

@@ -0,0 +1,97 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+
+public class MapColorMapping {
+    private static final Int2IntMap MAPPING = new Int2IntOpenHashMap(64, 0.99F);
+
+    static {
+        MAPPING.defaultReturnValue(-1);
+        MAPPING.put(144, 59); // (148, 124, 114) -> (148, 124, 114)
+        MAPPING.put(145, 56); // (180, 153, 139) -> (180, 153, 139)
+        MAPPING.put(146, 56); // (209, 177, 161) -> (209, 177, 161)
+        MAPPING.put(147, 45); // (111, 94, 85) -> (111, 94, 85)
+        MAPPING.put(148, 63); // (112, 58, 25) -> (112, 58, 25)
+        MAPPING.put(149, 60); // (137, 71, 31) -> (137, 71, 31)
+        MAPPING.put(150, 60); // (159, 82, 36) -> (159, 82, 36)
+        MAPPING.put(151, 136); // (84, 43, 19) -> (84, 43, 19)
+        MAPPING.put(152, 83); // (105, 61, 76) -> (105, 61, 76)
+        MAPPING.put(153, 83); // (129, 75, 93) -> (129, 75, 93)
+        MAPPING.put(154, 80); // (149, 87, 108) -> (149, 87, 108)
+        MAPPING.put(155, 115); // (79, 46, 57) -> (79, 46, 57)
+        MAPPING.put(156, 39); // (79, 76, 97) -> (79, 76, 97)
+        MAPPING.put(157, 39); // (97, 93, 119) -> (97, 93, 119)
+        MAPPING.put(158, 36); // (112, 108, 138) -> (112, 108, 138)
+        MAPPING.put(159, 47); // (59, 57, 73) -> (59, 57, 73)
+        MAPPING.put(160, 60); // (131, 94, 25) -> (131, 94, 25)
+        MAPPING.put(161, 61); // (160, 115, 31) -> (160, 115, 31)
+        MAPPING.put(162, 62); // (186, 133, 36) -> (186, 133, 36)
+        MAPPING.put(163, 137); // (98, 70, 19) -> (98, 70, 19)
+        MAPPING.put(164, 108); // (73, 83, 37) -> (73, 83, 37)
+        MAPPING.put(165, 108); // (89, 101, 46) -> (89, 101, 46)
+        MAPPING.put(166, 109); // (103, 117, 53) -> (103, 117, 53)
+        MAPPING.put(167, 111); // (55, 62, 28) -> (55, 62, 28)
+        MAPPING.put(168, 112); // (113, 54, 55) -> (113, 54, 55)
+        MAPPING.put(169, 113); // (138, 66, 67) -> (138, 66, 67)
+        MAPPING.put(170, 114); // (160, 77, 78) -> (160, 77, 78)
+        MAPPING.put(171, 115); // (85, 41, 41) -> (85, 41, 41)
+        MAPPING.put(172, 118); // (40, 29, 25) -> (40, 29, 25)
+        MAPPING.put(173, 107); // (49, 35, 30) -> (49, 35, 30)
+        MAPPING.put(174, 107); // (57, 41, 35) -> (57, 41, 35)
+        MAPPING.put(175, 118); // (30, 22, 19) -> (30, 22, 19)
+        MAPPING.put(176, 91); // (95, 76, 69) -> (95, 76, 69)
+        MAPPING.put(177, 45); // (116, 92, 85) -> (116, 92, 85)
+        MAPPING.put(178, 46); // (135, 107, 98) -> (135, 107, 98)
+        MAPPING.put(179, 47); // (71, 57, 52) -> (71, 57, 52)
+        MAPPING.put(180, 85); // (61, 65, 65) -> (61, 65, 65)
+        MAPPING.put(181, 44); // (75, 79, 79) -> (75, 79, 79)
+        MAPPING.put(182, 27); // (87, 92, 92) -> (87, 92, 92)
+        MAPPING.put(183, 84); // (46, 49, 49) -> (46, 49, 49)
+        MAPPING.put(184, 83); // (86, 52, 62) -> (86, 52, 62)
+        MAPPING.put(185, 83); // (105, 63, 76) -> (105, 63, 76)
+        MAPPING.put(186, 83); // (122, 73, 88) -> (122, 73, 88)
+        MAPPING.put(187, 84); // (65, 39, 47) -> (65, 39, 47)
+        MAPPING.put(188, 84); // (54, 44, 65) -> (54, 44, 65)
+        MAPPING.put(189, 71); // (66, 53, 79) -> (66, 53, 79)
+        MAPPING.put(190, 71); // (76, 62, 92) -> (76, 62, 92)
+        MAPPING.put(191, 87); // (40, 33, 49) -> (40, 33, 49)
+        MAPPING.put(192, 107); // (54, 35, 25) -> (54, 35, 25)
+        MAPPING.put(193, 139); // (66, 43, 30) -> (66, 43, 30)
+        MAPPING.put(194, 43); // (76, 50, 35) -> (76, 50, 35)
+        MAPPING.put(195, 107); // (40, 26, 19) -> (40, 26, 19)
+        MAPPING.put(196, 111); // (54, 58, 30) -> (54, 58, 30)
+        MAPPING.put(197, 111); // (66, 71, 36) -> (66, 71, 36)
+        MAPPING.put(198, 111); // (76, 82, 42) -> (76, 82, 42)
+        MAPPING.put(199, 107); // (40, 43, 22) -> (40, 43, 22)
+        MAPPING.put(200, 112); // (100, 42, 32) -> (100, 42, 32)
+        MAPPING.put(201, 113); // (123, 52, 40) -> (123, 52, 40)
+        MAPPING.put(202, 113); // (142, 60, 46) -> (142, 60, 46)
+        MAPPING.put(203, 115); // (75, 32, 24) -> (75, 32, 24)
+        MAPPING.put(204, 116); // (26, 16, 11) -> (26, 16, 11)
+        MAPPING.put(205, 117); // (32, 19, 14) -> (32, 19, 14)
+        MAPPING.put(206, 107); // (37, 22, 16) -> (37, 22, 16)
+        MAPPING.put(207, 119); // (20, 12, 8) -> (20, 12, 8)
+    }
+
+    public static int getNearestOldColor(int color) {
+        return MAPPING.getOrDefault(color, color);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/data/ParrotStorage.java

@@ -0,0 +1,40 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data;
+
+public class ParrotStorage {
+    private boolean tamed = true;
+    private boolean sitting = true;
+
+    public boolean isTamed() {
+        return tamed;
+    }
+
+    public void setTamed(boolean tamed) {
+        this.tamed = tamed;
+    }
+
+    public boolean isSitting() {
+        return sitting;
+    }
+
+    public void setSitting(boolean sitting) {
+        this.sitting = sitting;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/data/ShoulderTracker.java

@@ -0,0 +1,121 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viaversion.api.connection.StoredObject;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
+
+public class ShoulderTracker extends StoredObject {
+    private int entityId;
+    private String leftShoulder;
+    private String rightShoulder;
+
+    public ShoulderTracker(UserConnection user) {
+        super(user);
+    }
+
+    public void update() {
+        PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_12.CHAT_MESSAGE, null, getUser());
+
+        wrapper.write(Type.COMPONENT, Protocol1_9To1_8.fixJson(generateString()));
+        wrapper.write(Type.BYTE, (byte) 2);
+
+        try {
+            wrapper.scheduleSend(Protocol1_11_1To1_12.class);
+        } catch (Exception e) {
+            ViaBackwards.getPlatform().getLogger().severe("Failed to send the shoulder indication");
+            e.printStackTrace();
+        }
+    }
+
+    // Does actionbar not support json colors? :(
+    private String generateString() {
+        StringBuilder builder = new StringBuilder();
+
+        // Empty spaces because the non-json formatting is weird
+        builder.append("  ");
+        if (leftShoulder == null) {
+            builder.append("§4§lNothing");
+        } else {
+            builder.append("§2§l").append(getName(leftShoulder));
+        }
+
+        builder.append("§8§l <- §7§lShoulders§8§l -> ");
+
+        if (rightShoulder == null) {
+            builder.append("§4§lNothing");
+        } else {
+            builder.append("§2§l").append(getName(rightShoulder));
+        }
+
+        return builder.toString();
+    }
+
+    private String getName(String current) {
+        if (current.startsWith("minecraft:")) {
+            current = current.substring(10);
+        }
+
+        String[] array = current.split("_");
+        StringBuilder builder = new StringBuilder();
+
+        for (String s : array) {
+            builder.append(s.substring(0, 1).toUpperCase())
+                    .append(s.substring(1))
+                    .append(" ");
+        }
+
+        return builder.toString();
+    }
+
+    public int getEntityId() {
+        return entityId;
+    }
+
+    public void setEntityId(int entityId) {
+        this.entityId = entityId;
+    }
+
+    public String getLeftShoulder() {
+        return leftShoulder;
+    }
+
+    public void setLeftShoulder(String leftShoulder) {
+        this.leftShoulder = leftShoulder;
+    }
+
+    public String getRightShoulder() {
+        return rightShoulder;
+    }
+
+    public void setRightShoulder(String rightShoulder) {
+        this.rightShoulder = rightShoulder;
+    }
+
+    @Override
+    public String toString() {
+        return "ShoulderTracker{" + "entityId=" + entityId + ", leftShoulder='" + leftShoulder + '\'' + ", rightShoulder='" + rightShoulder + '\'' + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/BlockItemPackets1_12.java

@@ -0,0 +1,340 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.MapColorMapping;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntArrayTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.LongArrayTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ServerboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_9_1_2to1_9_3_4.types.Chunk1_9_3_4Type;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.Iterator;
+import java.util.Map;
+
+public class BlockItemPackets1_12 extends LegacyBlockItemRewriter<Protocol1_11_1To1_12> {
+
+    public BlockItemPackets1_12(Protocol1_11_1To1_12 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.MAP_DATA, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.BYTE);
+                map(Type.BOOLEAN);
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int count = wrapper.passthrough(Type.VAR_INT);
+                        for (int i = 0; i < count * 3; i++) {
+                            wrapper.passthrough(Type.BYTE);
+                        }
+                    }
+                });
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        short columns = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                        if (columns <= 0) return;
+
+                        short rows = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                        wrapper.passthrough(Type.UNSIGNED_BYTE); // X
+                        wrapper.passthrough(Type.UNSIGNED_BYTE); // Z
+                        byte[] data = wrapper.read(Type.BYTE_ARRAY_PRIMITIVE);
+                        for (int i = 0; i < data.length; i++) {
+                            short color = (short) (data[i] & 0xFF);
+                            if (color > 143) {
+                                color = (short) MapColorMapping.getNearestOldColor(color);
+                                data[i] = (byte) color;
+                            }
+                        }
+                        wrapper.write(Type.BYTE_ARRAY_PRIMITIVE, data);
+                    }
+                });
+            }
+        });
+
+        registerSetSlot(ClientboundPackets1_12.SET_SLOT, Type.ITEM);
+        registerWindowItems(ClientboundPackets1_12.WINDOW_ITEMS, Type.ITEM_ARRAY);
+        registerEntityEquipment(ClientboundPackets1_12.ENTITY_EQUIPMENT, Type.ITEM);
+
+        // Plugin message Packet -> Trading
+        protocol.registerClientbound(ClientboundPackets1_12.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
+                            wrapper.passthrough(Type.INT); // Passthrough Window ID
+
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                            for (int i = 0; i < size; i++) {
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
+
+                                boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                                if (secondItem)
+                                    wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Second Item
+
+                                wrapper.passthrough(Type.BOOLEAN); // Trade disabled
+                                wrapper.passthrough(Type.INT); // Number of tools uses
+                                wrapper.passthrough(Type.INT); // Maximum number of trade uses
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLICK_WINDOW, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.SHORT); // 1 - Slot
+                map(Type.BYTE); // 2 - Button
+                map(Type.SHORT); // 3 - Action number
+                map(Type.VAR_INT); // 4 - Mode
+                map(Type.ITEM); // 5 - Clicked Item
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (wrapper.get(Type.VAR_INT, 0) == 1) { // Shift click
+                            // https://github.com/ViaVersion/ViaVersion/pull/754
+                            // Previously clients grab the item from the clicked slot *before* it has
+                            // been moved however now they grab the slot item *after* it has been moved
+                            // and send that in the packet.
+                            wrapper.set(Type.ITEM, 0, null); // Set null item (probably will work)
+
+                            // Apologize (may happen in some cases, maybe if inventory is full?)
+                            PacketWrapper confirm = wrapper.create(ServerboundPackets1_12.WINDOW_CONFIRMATION);
+                            confirm.write(Type.UNSIGNED_BYTE, wrapper.get(Type.UNSIGNED_BYTE, 0));
+                            confirm.write(Type.SHORT, wrapper.get(Type.SHORT, 1));
+                            confirm.write(Type.BOOLEAN, false); // Success - not used
+
+                            wrapper.sendToServer(Protocol1_11_1To1_12.class);
+                            wrapper.cancel();
+                            confirm.sendToServer(Protocol1_11_1To1_12.class);
+                            return;
+
+                        }
+                        Item item = wrapper.get(Type.ITEM, 0);
+                        handleItemToServer(item);
+                    }
+                });
+            }
+        });
+
+        registerCreativeInvAction(ServerboundPackets1_9_3.CREATIVE_INVENTORY_ACTION, Type.ITEM);
+
+        protocol.registerClientbound(ClientboundPackets1_12.CHUNK_DATA, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+                        Chunk1_9_3_4Type type = new Chunk1_9_3_4Type(clientWorld); // Use the 1.9.4 Chunk type since nothing changed.
+                        Chunk chunk = wrapper.passthrough(type);
+
+                        handleChunk(chunk);
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.BLOCK_CHANGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.POSITION); // 0 - Block Position
+                map(Type.VAR_INT); // 1 - Block
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int idx = wrapper.get(Type.VAR_INT, 0);
+                        wrapper.set(Type.VAR_INT, 0, handleBlockID(idx));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.MULTI_BLOCK_CHANGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Chunk X
+                map(Type.INT); // 1 - Chunk Z
+                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
+                            record.setBlockId(handleBlockID(record.getBlockId()));
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.BLOCK_ENTITY_DATA, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.POSITION); // 0 - Position
+                map(Type.UNSIGNED_BYTE); // 1 - Action
+                map(Type.NBT); // 2 - NBT
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        // Remove bed color
+                        if (wrapper.get(Type.UNSIGNED_BYTE, 0) == 11)
+                            wrapper.cancel();
+                    }
+                });
+            }
+        });
+
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.metaType().type().equals(Type.ITEM)) // Is Item
+                meta.setValue(handleItemToClient((Item) meta.getValue()));
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLIENT_STATUS, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // Action ID
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        // Open Inventory
+                        if (wrapper.get(Type.VAR_INT, 0) == 2) {
+                            wrapper.cancel();
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(item);
+
+        if (item.tag() != null) {
+            CompoundTag backupTag = new CompoundTag();
+            if (handleNbtToClient(item.tag(), backupTag)) {
+                item.tag().put("Via|LongArrayTags", backupTag);
+            }
+        }
+
+        return item;
+    }
+
+    private boolean handleNbtToClient(CompoundTag compoundTag, CompoundTag backupTag) {
+        // Long array tags were introduced in 1.12 - just remove them
+        // Only save the removed tags instead of blindly copying the entire nbt again
+        Iterator<Map.Entry<String, Tag>> iterator = compoundTag.iterator();
+        boolean hasLongArrayTag = false;
+        while (iterator.hasNext()) {
+            Map.Entry<String, Tag> entry = iterator.next();
+            if (entry.getValue() instanceof CompoundTag) {
+                CompoundTag nestedBackupTag = new CompoundTag();
+                backupTag.put(entry.getKey(), nestedBackupTag);
+                hasLongArrayTag |= handleNbtToClient((CompoundTag) entry.getValue(), nestedBackupTag);
+            } else if (entry.getValue() instanceof LongArrayTag) {
+                backupTag.put(entry.getKey(), fromLongArrayTag((LongArrayTag) entry.getValue()));
+                iterator.remove();
+                hasLongArrayTag = true;
+            }
+        }
+        return hasLongArrayTag;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(item);
+
+        if (item.tag() != null) {
+            Tag tag = item.tag().remove("Via|LongArrayTags");
+            if (tag instanceof CompoundTag) {
+                handleNbtToServer(item.tag(), (CompoundTag) tag);
+            }
+        }
+
+        return item;
+    }
+
+    private void handleNbtToServer(CompoundTag compoundTag, CompoundTag backupTag) {
+        // Restore the removed long array tags
+        for (Map.Entry<String, Tag> entry : backupTag) {
+            if (entry.getValue() instanceof CompoundTag) {
+                CompoundTag nestedTag = compoundTag.get(entry.getKey());
+                handleNbtToServer(nestedTag, (CompoundTag) entry.getValue());
+            } else {
+                compoundTag.put(entry.getKey(), fromIntArrayTag((IntArrayTag) entry.getValue()));
+            }
+        }
+    }
+
+    private IntArrayTag fromLongArrayTag(LongArrayTag tag) {
+        int[] intArray = new int[tag.length() * 2];
+        long[] longArray = tag.getValue();
+        int i = 0;
+        for (long l : longArray) {
+            intArray[i++] = (int) (l >> 32);
+            intArray[i++] = (int) l;
+        }
+        return new IntArrayTag(intArray);
+    }
+
+    private LongArrayTag fromIntArrayTag(IntArrayTag tag) {
+        long[] longArray = new long[tag.length() / 2];
+        int[] intArray = tag.getValue();
+        for (int i = 0, j = 0; i < intArray.length; i += 2, j++) {
+            longArray[j] = (long) intArray[i] << 32 | ((long) intArray[i + 1] & 0xFFFFFFFFL);
+        }
+        return new LongArrayTag(longArray);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/ChatItemRewriter.java

@@ -0,0 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets;
+
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.gson.JsonArray;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+
+public class ChatItemRewriter {
+
+    public static void toClient(JsonElement element, UserConnection user) {
+        if (element instanceof JsonObject) {
+            JsonObject obj = (JsonObject) element;
+            if (obj.has("hoverEvent")) {
+                if (obj.get("hoverEvent") instanceof JsonObject) {
+                    JsonObject hoverEvent = (JsonObject) obj.get("hoverEvent");
+                    if (hoverEvent.has("action") && hoverEvent.has("value")) {
+                        String type = hoverEvent.get("action").getAsString();
+                        if (type.equals("show_item") || type.equals("show_entity")) {
+                            JsonElement value = hoverEvent.get("value");
+
+                            if (value.isJsonArray()) {
+                                JsonArray newArray = new JsonArray();
+
+                                int index = 0;
+                                for (JsonElement valueElement : value.getAsJsonArray()) {
+                                    if (valueElement.isJsonPrimitive() && valueElement.getAsJsonPrimitive().isString()) {
+                                        String newValue = index + ":" + valueElement.getAsString();
+                                        newArray.add(new JsonPrimitive(newValue));
+                                    }
+                                }
+
+                                hoverEvent.add("value", newArray);
+                            }
+                        }
+                    }
+                }
+            } else if (obj.has("extra")) {
+                toClient(obj.get("extra"), user);
+            }
+        } else if (element instanceof JsonArray) {
+            JsonArray array = (JsonArray) element;
+            for (JsonElement value : array) {
+                toClient(value, user);
+            }
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/ChatPackets1_12.java

@@ -0,0 +1,59 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets;
+
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.AdvancementTranslations;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.rewriter.RewriterBase;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+
+public class ChatPackets1_12 extends RewriterBase<Protocol1_11_1To1_12> {
+
+    private final ComponentRewriter componentRewriter = new ComponentRewriter() {
+        @Override
+        protected void handleTranslate(JsonObject object, String translate) {
+            String text = AdvancementTranslations.get(translate);
+            if (text != null) {
+                object.addProperty("translate", text);
+            }
+        }
+    };
+
+    public ChatPackets1_12(Protocol1_11_1To1_12 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.CHAT_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    JsonElement element = wrapper.passthrough(Type.COMPONENT);
+                    componentRewriter.processText(element);
+                });
+            }
+        });
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/EntityPackets1_12.java

@@ -0,0 +1,316 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.ParrotStorage;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.ShoulderTracker;
+import com.viaversion.viabackwards.utils.Block;
+import com.viaversion.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_12Types;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_12;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_12;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+
+import java.util.Optional;
+
+public class EntityPackets1_12 extends LegacyEntityRewriter<Protocol1_11_1To1_12> {
+
+    public EntityPackets1_12(Protocol1_11_1To1_12 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.SPAWN_ENTITY, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.BYTE); // 2 - Type
+                map(Type.DOUBLE); // 3 - x
+                map(Type.DOUBLE); // 4 - y
+                map(Type.DOUBLE); // 5 - z
+                map(Type.BYTE); // 6 - Pitch
+                map(Type.BYTE); // 7 - Yaw
+                map(Type.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(id -> Entity1_12Types.ObjectType.findById(id).orElse(null)));
+
+                // Handle FallingBlock blocks
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        Optional<Entity1_12Types.ObjectType> type = Entity1_12Types.ObjectType.findById(wrapper.get(Type.BYTE, 0));
+                        if (type.isPresent() && type.get() == Entity1_12Types.ObjectType.FALLING_BLOCK) {
+                            int objectData = wrapper.get(Type.INT, 0);
+                            int objType = objectData & 4095;
+                            int data = objectData >> 12 & 15;
+
+                            Block block = protocol.getItemRewriter().handleBlock(objType, data);
+                            if (block == null) {
+                                return;
+                            }
+
+                            wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
+                        }
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.SPAWN_EXPERIENCE_ORB, Entity1_12Types.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_12.SPAWN_GLOBAL_ENTITY, Entity1_12Types.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_12.SPAWN_MOB, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.VAR_INT); // 2 - Entity Type
+                map(Type.DOUBLE); // 3 - X
+                map(Type.DOUBLE); // 4 - Y
+                map(Type.DOUBLE); // 5 - Z
+                map(Type.BYTE); // 6 - Yaw
+                map(Type.BYTE); // 7 - Pitch
+                map(Type.BYTE); // 8 - Head Pitch
+                map(Type.SHORT); // 9 - Velocity X
+                map(Type.SHORT); // 10 - Velocity Y
+                map(Type.SHORT); // 11 - Velocity Z
+                map(Types1_12.METADATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler());
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter(Types1_12.METADATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.SPAWN_PAINTING, Entity1_12Types.EntityType.PAINTING);
+
+        protocol.registerClientbound(ClientboundPackets1_12.SPAWN_PLAYER, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                map(Type.UUID); // 1 - Player UUID
+                map(Type.DOUBLE); // 2 - X
+                map(Type.DOUBLE); // 3 - Y
+                map(Type.DOUBLE); // 4 - Z
+                map(Type.BYTE); // 5 - Yaw
+                map(Type.BYTE); // 6 - Pitch
+                map(Types1_12.METADATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_12.METADATA_LIST, Entity1_12Types.EntityType.PLAYER));
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.JOIN_GAME, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Type.INT); // 2 - Dimension
+
+                handler(getTrackerHandler(Entity1_12Types.EntityType.PLAYER, Type.INT));
+
+                handler(getDimensionHandler(1));
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        ShoulderTracker tracker = wrapper.user().get(ShoulderTracker.class);
+                        tracker.setEntityId(wrapper.get(Type.INT, 0));
+                    }
+                });
+
+                // Send fake inventory achievement
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper packetWrapper) throws Exception {
+                        PacketWrapper wrapper = PacketWrapper.create(0x07, null, packetWrapper.user());
+
+                        wrapper.write(Type.VAR_INT, 1);
+                        wrapper.write(Type.STRING, "achievement.openInventory");
+                        wrapper.write(Type.VAR_INT, 1);
+
+                        wrapper.scheduleSend(Protocol1_11_1To1_12.class);
+                    }
+                });
+            }
+        });
+
+        registerRespawn(ClientboundPackets1_12.RESPAWN);
+        registerRemoveEntities(ClientboundPackets1_12.DESTROY_ENTITIES);
+        registerMetadataRewriter(ClientboundPackets1_12.ENTITY_METADATA, Types1_12.METADATA_LIST);
+
+        protocol.registerClientbound(ClientboundPackets1_12.ENTITY_PROPERTIES, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.INT);
+                handler(wrapper -> {
+                    int size = wrapper.get(Type.INT, 0);
+                    int newSize = size;
+                    for (int i = 0; i < size; i++) {
+                        String key = wrapper.read(Type.STRING);
+                        // Remove new attribute
+                        if (key.equals("generic.flyingSpeed")) {
+                            newSize--;
+                            wrapper.read(Type.DOUBLE);
+                            int modSize = wrapper.read(Type.VAR_INT);
+                            for (int j = 0; j < modSize; j++) {
+                                wrapper.read(Type.UUID);
+                                wrapper.read(Type.DOUBLE);
+                                wrapper.read(Type.BYTE);
+                            }
+                        } else {
+                            wrapper.write(Type.STRING, key);
+                            wrapper.passthrough(Type.DOUBLE);
+                            int modSize = wrapper.passthrough(Type.VAR_INT);
+                            for (int j = 0; j < modSize; j++) {
+                                wrapper.passthrough(Type.UUID);
+                                wrapper.passthrough(Type.DOUBLE);
+                                wrapper.passthrough(Type.BYTE);
+                            }
+                        }
+                    }
+
+                    if (newSize != size) {
+                        wrapper.set(Type.INT, 0, newSize);
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        mapEntityTypeWithData(Entity1_12Types.EntityType.PARROT, Entity1_12Types.EntityType.BAT).plainName().spawnMetadata(storage -> storage.add(new Metadata(12, MetaType1_12.Byte, (byte) 0x00)));
+        mapEntityTypeWithData(Entity1_12Types.EntityType.ILLUSION_ILLAGER, Entity1_12Types.EntityType.EVOCATION_ILLAGER).plainName();
+
+        // Handle Illager
+        filter().filterFamily(Entity1_12Types.EntityType.EVOCATION_ILLAGER).cancel(12);
+        filter().filterFamily(Entity1_12Types.EntityType.EVOCATION_ILLAGER).index(13).toIndex(12);
+
+        filter().type(Entity1_12Types.EntityType.ILLUSION_ILLAGER).index(0).handler((event, meta) -> {
+            byte mask = (byte) meta.getValue();
+
+            if ((mask & 0x20) == 0x20) {
+                mask &= ~0x20;
+            }
+
+            meta.setValue(mask);
+        });
+
+        // Create Parrot storage
+        filter().filterFamily(Entity1_12Types.EntityType.PARROT).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ParrotStorage.class)) {
+                data.put(new ParrotStorage());
+            }
+        });
+        // Parrot remove animal metadata
+        filter().type(Entity1_12Types.EntityType.PARROT).cancel(12); // Is baby
+        filter().type(Entity1_12Types.EntityType.PARROT).index(13).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            ParrotStorage storage = data.get(ParrotStorage.class);
+            boolean isSitting = (((byte) meta.getValue()) & 0x01) == 0x01;
+            boolean isTamed = (((byte) meta.getValue()) & 0x04) == 0x04;
+
+            if (!storage.isTamed() && isTamed) {
+                // TODO do something to let the user know it's done
+            }
+
+            storage.setTamed(isTamed);
+
+            if (isSitting) {
+                event.setIndex(12);
+                meta.setValue((byte) 0x01);
+                storage.setSitting(true);
+            } else if (storage.isSitting()) {
+                event.setIndex(12);
+                meta.setValue((byte) 0x00);
+                storage.setSitting(false);
+            } else {
+                event.cancel();
+            }
+        }); // Flags (Is sitting etc, might be useful in the future
+        filter().type(Entity1_12Types.EntityType.PARROT).cancel(14); // Owner
+        filter().type(Entity1_12Types.EntityType.PARROT).cancel(15); // Variant
+
+        // Left shoulder entity data
+        filter().type(Entity1_12Types.EntityType.PLAYER).index(15).handler((event, meta) -> {
+            CompoundTag tag = (CompoundTag) meta.getValue();
+            ShoulderTracker tracker = event.user().get(ShoulderTracker.class);
+
+            if (tag.isEmpty() && tracker.getLeftShoulder() != null) {
+                tracker.setLeftShoulder(null);
+                tracker.update();
+            } else if (tag.contains("id") && event.entityId() == tracker.getEntityId()) {
+                String id = (String) tag.get("id").getValue();
+                if (tracker.getLeftShoulder() == null || !tracker.getLeftShoulder().equals(id)) {
+                    tracker.setLeftShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+
+        // Right shoulder entity data
+        filter().type(Entity1_12Types.EntityType.PLAYER).index(16).handler((event, meta) -> {
+            CompoundTag tag = (CompoundTag) event.meta().getValue();
+            ShoulderTracker tracker = event.user().get(ShoulderTracker.class);
+
+            if (tag.isEmpty() && tracker.getRightShoulder() != null) {
+                tracker.setRightShoulder(null);
+                tracker.update();
+            } else if (tag.contains("id") && event.entityId() == tracker.getEntityId()) {
+                String id = (String) tag.get("id").getValue();
+                if (tracker.getRightShoulder() == null || !tracker.getRightShoulder().equals(id)) {
+                    tracker.setRightShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return Entity1_12Types.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    protected EntityType getObjectTypeFromId(final int typeId) {
+        return Entity1_12Types.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11_1to1_12/packets/SoundPackets1_12.java

@@ -1,28 +1,40 @@
 /*
- * Copyright (c) 2016 Matsv
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
  *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
  *
- * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
  *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-package nl.matsv.viabackwards.protocol.protocol1_12to1_11_1.packets;
+package com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.packets;
 
-import nl.matsv.viabackwards.api.rewriters.SoundRewriter;
-import nl.matsv.viabackwards.protocol.protocol1_12to1_11_1.Protocol1_11_1To1_12;
-import us.myles.ViaVersion.api.PacketWrapper;
-import us.myles.ViaVersion.api.remapper.PacketHandler;
-import us.myles.ViaVersion.api.remapper.PacketRemapper;
-import us.myles.ViaVersion.api.type.Type;
-import us.myles.ViaVersion.packets.State;
+import com.viaversion.viabackwards.api.rewriters.LegacySoundRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+
+public class SoundPackets1_12 extends LegacySoundRewriter<Protocol1_11_1To1_12> {
+
+    public SoundPackets1_12(Protocol1_11_1To1_12 protocol) {
+        super(protocol);
+    }
 
-public class SoundPackets1_12 extends SoundRewriter<Protocol1_11_1To1_12> {
     @Override
-    protected void registerPackets(Protocol1_11_1To1_12 protocol) {
-        // Named sound effect
-        protocol.registerOutgoing(State.PLAY, 0x19, 0x19, new PacketRemapper() {
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.NAMED_SOUND, new PacketRemapper() {
             @Override
             public void registerMap() {
                 map(Type.STRING); // 0 - Sound name
@@ -35,8 +47,7 @@ public class SoundPackets1_12 extends SoundRewriter<Protocol1_11_1To1_12> {
             }
         });
 
-        // Sound effect
-        protocol.registerOutgoing(State.PLAY, 0x48, 0x46, new PacketRemapper() {
+        protocol.registerClientbound(ClientboundPackets1_12.SOUND, new PacketRemapper() {
             @Override
             public void registerMap() {
                 map(Type.VAR_INT); // 0 - Sound name
@@ -52,13 +63,15 @@ public class SoundPackets1_12 extends SoundRewriter<Protocol1_11_1To1_12> {
                     public void handle(PacketWrapper wrapper) throws Exception {
                         int oldId = wrapper.get(Type.VAR_INT, 0);
                         int newId = handleSounds(oldId);
-                        if (newId == -1)
+                        if (newId == -1) {
                             wrapper.cancel();
-                        else {
-                            if (hasPitch(oldId))
-                                wrapper.set(Type.FLOAT, 1, handlePitch(oldId));
-                            wrapper.set(Type.VAR_INT, 0, newId);
+                            return;
                         }
+
+                        if (hasPitch(oldId)) {
+                            wrapper.set(Type.FLOAT, 1, handlePitch(oldId));
+                        }
+                        wrapper.set(Type.VAR_INT, 0, newId);
                     }
                 });
             }
@@ -68,6 +81,9 @@ public class SoundPackets1_12 extends SoundRewriter<Protocol1_11_1To1_12> {
 
     @Override
     protected void registerRewrites() {
+        //TODO use the diff file to also have named sound remaps
+        // (there were *A LOT* of refactored names)
+
         // Replacement sounds, suggestions are always welcome
         // Automatically generated from PAaaS
         added(26, 277, 1.4f); // block.end_portal.spawn -> entity.lightning.thunder

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11to1_11_1/Protocol1_11To1_11_1.java

@@ -0,0 +1,66 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11to1_11_1;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.packets.EntityPackets1_11_1;
+import com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.packets.ItemPackets1_11_1;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_11Types;
+import com.viaversion.viaversion.api.rewriter.ItemRewriter;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+
+public class Protocol1_11To1_11_1 extends BackwardsProtocol<ClientboundPackets1_9_3, ClientboundPackets1_9_3, ServerboundPackets1_9_3, ServerboundPackets1_9_3> {
+
+    private final EntityPackets1_11_1 entityPackets = new EntityPackets1_11_1(this);
+    private final ItemRewriter itemRewriter = new ItemPackets1_11_1(this);
+
+    public Protocol1_11To1_11_1() {
+        super(ClientboundPackets1_9_3.class, ClientboundPackets1_9_3.class, ServerboundPackets1_9_3.class, ServerboundPackets1_9_3.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        entityPackets.register();
+        itemRewriter.register();
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        // Register ClientWorld
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld(user));
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, Entity1_11Types.EntityType.PLAYER));
+    }
+
+    @Override
+    public EntityPackets1_11_1 getEntityRewriter() {
+        return entityPackets;
+    }
+
+    @Override
+    public ItemRewriter getItemRewriter() {
+        return itemRewriter;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11to1_11_1/packets/EntityPackets1_11_1.java

@@ -0,0 +1,127 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.packets;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.Protocol1_11To1_11_1;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_11Types;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_9;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+
+public class EntityPackets1_11_1 extends LegacyEntityRewriter<Protocol1_11To1_11_1> {
+
+    public EntityPackets1_11_1(Protocol1_11To1_11_1 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_ENTITY, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.BYTE); // 2 - Type
+                map(Type.DOUBLE); // 3 - x
+                map(Type.DOUBLE); // 4 - y
+                map(Type.DOUBLE); // 5 - z
+                map(Type.BYTE); // 6 - Pitch
+                map(Type.BYTE); // 7 - Yaw
+                map(Type.INT); // 8 - data
+
+                // Track Entity
+                handler(getObjectTrackerHandler());
+                handler(getObjectRewriter(id -> Entity1_11Types.ObjectType.findById(id).orElse(null)));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_EXPERIENCE_ORB, Entity1_11Types.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.SPAWN_GLOBAL_ENTITY, Entity1_11Types.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_MOB, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity id
+                map(Type.UUID); // 1 - UUID
+                map(Type.VAR_INT); // 2 - Entity Type
+                map(Type.DOUBLE); // 3 - X
+                map(Type.DOUBLE); // 4 - Y
+                map(Type.DOUBLE); // 5 - Z
+                map(Type.BYTE); // 6 - Yaw
+                map(Type.BYTE); // 7 - Pitch
+                map(Type.BYTE); // 8 - Head Pitch
+                map(Type.SHORT); // 9 - Velocity X
+                map(Type.SHORT); // 10 - Velocity Y
+                map(Type.SHORT); // 11 - Velocity Z
+                map(Types1_9.METADATA_LIST); // 12 - Metadata
+
+                // Track entity
+                handler(getTrackerHandler());
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter(Types1_9.METADATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_PAINTING, Entity1_11Types.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.JOIN_GAME, Entity1_11Types.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_PLAYER, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                map(Type.UUID); // 1 - Player UUID
+                map(Type.DOUBLE); // 2 - X
+                map(Type.DOUBLE); // 3 - Y
+                map(Type.DOUBLE); // 4 - Z
+                map(Type.BYTE); // 5 - Yaw
+                map(Type.BYTE); // 6 - Pitch
+                map(Types1_9.METADATA_LIST); // 7 - Metadata list
+
+                handler(getTrackerAndMetaHandler(Types1_9.METADATA_LIST, Entity1_11Types.EntityType.PLAYER));
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_9_3.DESTROY_ENTITIES);
+        registerMetadataRewriter(ClientboundPackets1_9_3.ENTITY_METADATA, Types1_9.METADATA_LIST);
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle non-existing firework metadata (index 7 entity id for boosting)
+        filter().type(Entity1_11Types.EntityType.FIREWORK).cancel(7);
+
+        // Handle non-existing pig metadata (index 14 - boost time)
+        filter().type(Entity1_11Types.EntityType.PIG).cancel(14);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return Entity1_11Types.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    protected EntityType getObjectTypeFromId(final int typeId) {
+        return Entity1_11Types.getTypeFromId(typeId, true);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_11to1_11_1/packets/ItemPackets1_11_1.java

@@ -0,0 +1,130 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.packets;
+
+import com.viaversion.viabackwards.api.rewriters.LegacyBlockItemRewriter;
+import com.viaversion.viabackwards.api.rewriters.LegacyEnchantmentRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11to1_11_1.Protocol1_11To1_11_1;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ServerboundPackets1_9_3;
+
+public class ItemPackets1_11_1 extends LegacyBlockItemRewriter<Protocol1_11To1_11_1> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public ItemPackets1_11_1(Protocol1_11To1_11_1 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerSetSlot(ClientboundPackets1_9_3.SET_SLOT, Type.ITEM);
+        registerWindowItems(ClientboundPackets1_9_3.WINDOW_ITEMS, Type.ITEM_ARRAY);
+        registerEntityEquipment(ClientboundPackets1_9_3.ENTITY_EQUIPMENT, Type.ITEM);
+
+        // Plugin message Packet -> Trading
+        protocol.registerClientbound(ClientboundPackets1_9_3.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (wrapper.get(Type.STRING, 0).equalsIgnoreCase("MC|TrList")) {
+                            wrapper.passthrough(Type.INT); // Passthrough Window ID
+
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                            for (int i = 0; i < size; i++) {
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Input Item
+                                wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Output Item
+
+                                boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                                if (secondItem) {
+                                    wrapper.write(Type.ITEM, handleItemToClient(wrapper.read(Type.ITEM))); // Second Item
+                                }
+
+                                wrapper.passthrough(Type.BOOLEAN); // Trade disabled
+                                wrapper.passthrough(Type.INT); // Number of tools uses
+                                wrapper.passthrough(Type.INT); // Maximum number of trade uses
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        registerClickWindow(ServerboundPackets1_9_3.CLICK_WINDOW, Type.ITEM);
+        registerCreativeInvAction(ServerboundPackets1_9_3.CREATIVE_INVENTORY_ACTION, Type.ITEM);
+
+        // Handle item metadata
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.metaType().type().equals(Type.ITEM)) { // Is Item
+                meta.setValue(handleItemToClient((Item) meta.getValue()));
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName);
+        enchantmentRewriter.registerEnchantment(22, "§7Sweeping Edge");
+    }
+
+    @Override
+    public Item handleItemToClient(Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        if (tag.get("ench") instanceof ListTag) {
+            enchantmentRewriter.rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.get("StoredEnchantments") instanceof ListTag) {
+            enchantmentRewriter.rewriteEnchantmentsToClient(tag, true);
+        }
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(item);
+
+        CompoundTag tag = item.tag();
+        if (tag == null) return item;
+
+        if (tag.contains(nbtTagName + "|ench")) {
+            enchantmentRewriter.rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(nbtTagName + "|StoredEnchantments")) {
+            enchantmentRewriter.rewriteEnchantmentsToServer(tag, true);
+        }
+        return item;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_1to1_12_2/KeepAliveTracker.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_1to1_12_2;
+
+import com.viaversion.viaversion.api.connection.StorableObject;
+
+public class KeepAliveTracker implements StorableObject {
+    private long keepAlive = Integer.MAX_VALUE;
+
+    public long getKeepAlive() {
+        return keepAlive;
+    }
+
+    public void setKeepAlive(long keepAlive) {
+        this.keepAlive = keepAlive;
+    }
+
+    @Override
+    public String toString() {
+        return "KeepAliveTracker{" + "keepAlive=" + keepAlive + '}';
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_1to1_12_2/Protocol1_12_1To1_12_2.java

@@ -0,0 +1,77 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_1to1_12_2;
+
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ServerboundPackets1_12_1;
+
+public class Protocol1_12_1To1_12_2 extends BackwardsProtocol<ClientboundPackets1_12_1, ClientboundPackets1_12_1, ServerboundPackets1_12_1, ServerboundPackets1_12_1> {
+
+    public Protocol1_12_1To1_12_2() {
+        super(ClientboundPackets1_12_1.class, ClientboundPackets1_12_1.class, ServerboundPackets1_12_1.class, ServerboundPackets1_12_1.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerClientbound(ClientboundPackets1_12_1.KEEP_ALIVE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper packetWrapper) throws Exception {
+                        Long keepAlive = packetWrapper.read(Type.LONG);
+                        packetWrapper.user().get(KeepAliveTracker.class).setKeepAlive(keepAlive);
+                        packetWrapper.write(Type.VAR_INT, keepAlive.hashCode());
+                    }
+                });
+            }
+        });
+
+        registerServerbound(ServerboundPackets1_12_1.KEEP_ALIVE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper packetWrapper) throws Exception {
+                        int keepAlive = packetWrapper.read(Type.VAR_INT);
+                        long realKeepAlive = packetWrapper.user().get(KeepAliveTracker.class).getKeepAlive();
+                        if (keepAlive != Long.hashCode(realKeepAlive)) {
+                            packetWrapper.cancel(); // Wrong data, cancel packet
+                            return;
+                        }
+                        packetWrapper.write(Type.LONG, realKeepAlive);
+                        // Reset KeepAliveTracker (to prevent sending same valid value in a row causing a timeout)
+                        packetWrapper.user().get(KeepAliveTracker.class).setKeepAlive(Integer.MAX_VALUE);
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public void init(UserConnection userConnection) {
+        userConnection.put(new KeepAliveTracker());
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/Protocol1_12_2To1_13.java

@@ -0,0 +1,130 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.BackwardsProtocol;
+import com.viaversion.viabackwards.api.rewriters.TranslatableRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.BackwardsMappings;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.PaintingMapping;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets.BlockItemPackets1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets.EntityPackets1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets.PlayerPacket1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets.SoundPackets1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.BackwardsBlockStorage;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.PlayerPositionStorage1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.TabCompleteStorage;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_13Types;
+import com.viaversion.viaversion.api.rewriter.EntityRewriter;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ServerboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ServerboundPackets1_13;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.storage.ClientWorld;
+
+public class Protocol1_12_2To1_13 extends BackwardsProtocol<ClientboundPackets1_13, ClientboundPackets1_12_1, ServerboundPackets1_13, ServerboundPackets1_12_1> {
+
+    public static final BackwardsMappings MAPPINGS = new BackwardsMappings();
+    private final EntityRewriter entityRewriter = new EntityPackets1_13(this);
+    private final BlockItemPackets1_13 blockItemPackets = new BlockItemPackets1_13(this);
+
+    public Protocol1_12_2To1_13() {
+        super(ClientboundPackets1_13.class, ClientboundPackets1_12_1.class, ServerboundPackets1_13.class, ServerboundPackets1_12_1.class);
+    }
+
+    @Override
+    protected void registerPackets() {
+        executeAsyncAfterLoaded(Protocol1_13To1_12_2.class, () -> {
+            MAPPINGS.load();
+            PaintingMapping.init();
+            Via.getManager().getProviders().register(BackwardsBlockEntityProvider.class, new BackwardsBlockEntityProvider());
+        });
+
+        TranslatableRewriter translatableRewriter = new TranslatableRewriter(this) {
+            @Override
+            protected void handleTranslate(JsonObject root, String translate) {
+                String newTranslate = newTranslatables.get(translate);
+                if (newTranslate != null || (newTranslate = getMappingData().getTranslateMappings().get(translate)) != null) {
+                    root.addProperty("translate", newTranslate);
+                }
+            }
+        };
+        translatableRewriter.registerPing();
+        translatableRewriter.registerBossBar(ClientboundPackets1_13.BOSSBAR);
+        translatableRewriter.registerChatMessage(ClientboundPackets1_13.CHAT_MESSAGE);
+        translatableRewriter.registerLegacyOpenWindow(ClientboundPackets1_13.OPEN_WINDOW);
+        translatableRewriter.registerDisconnect(ClientboundPackets1_13.DISCONNECT);
+        translatableRewriter.registerCombatEvent(ClientboundPackets1_13.COMBAT_EVENT);
+        translatableRewriter.registerTitle(ClientboundPackets1_13.TITLE);
+        translatableRewriter.registerTabList(ClientboundPackets1_13.TAB_LIST);
+
+        blockItemPackets.register();
+        entityRewriter.register();
+        new PlayerPacket1_13(this).register();
+        new SoundPackets1_13(this).register();
+
+        cancelClientbound(ClientboundPackets1_13.NBT_QUERY);
+        cancelClientbound(ClientboundPackets1_13.CRAFT_RECIPE_RESPONSE);
+        cancelClientbound(ClientboundPackets1_13.UNLOCK_RECIPES);
+        cancelClientbound(ClientboundPackets1_13.ADVANCEMENTS);
+        cancelClientbound(ClientboundPackets1_13.DECLARE_RECIPES);
+        cancelClientbound(ClientboundPackets1_13.TAGS);
+
+        cancelServerbound(ServerboundPackets1_12_1.CRAFT_RECIPE_REQUEST);
+        cancelServerbound(ServerboundPackets1_12_1.RECIPE_BOOK_DATA);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        // Register ClientWorld
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld(user));
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, Entity1_13Types.EntityType.PLAYER));
+
+        user.put(new BackwardsBlockStorage());
+        user.put(new TabCompleteStorage());
+
+        if (ViaBackwards.getConfig().isFix1_13FacePlayer() && !user.has(PlayerPositionStorage1_13.class)) {
+            user.put(new PlayerPositionStorage1_13());
+        }
+    }
+
+    @Override
+    public BackwardsMappings getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityRewriter getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPackets1_13 getItemRewriter() {
+        return blockItemPackets;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/BannerHandler.java

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider.BackwardsBlockEntityHandler;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+
+public class BannerHandler implements BackwardsBlockEntityHandler {
+    private static final int WALL_BANNER_START = 7110; // 4 each
+    private static final int WALL_BANNER_STOP = 7173;
+
+    private static final int BANNER_START = 6854; // 16 each
+    private static final int BANNER_STOP = 7109;
+
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        // Normal banners
+        if (blockId >= BANNER_START && blockId <= BANNER_STOP) {
+            int color = (blockId - BANNER_START) >> 4;
+            tag.put("Base", new IntTag((15 - color)));
+        }
+        // Wall banners
+        else if (blockId >= WALL_BANNER_START && blockId <= WALL_BANNER_STOP) {
+            int color = (blockId - WALL_BANNER_START) >> 2;
+            tag.put("Base", new IntTag((15 - color)));
+        } else {
+            ViaBackwards.getPlatform().getLogger().warning("Why does this block have the banner block entity? :(" + tag);
+        }
+
+        // Invert colors
+        Tag patternsTag = tag.get("Patterns");
+        if (patternsTag instanceof ListTag) {
+            for (Tag pattern : (ListTag) patternsTag) {
+                if (!(pattern instanceof CompoundTag)) continue;
+
+                IntTag c = ((CompoundTag) pattern).get("Color");
+                c.setValue(15 - c.asInt()); // Invert color id
+            }
+        }
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/BedHandler.java

@@ -0,0 +1,37 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+
+public class BedHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        int offset = blockId - 748;
+        int color = offset >> 4;
+
+        tag.put("color", new IntTag(color));
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/FlowerPotHandler.java

@@ -0,0 +1,84 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.util.Pair;
+
+public class FlowerPotHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    private static final Int2ObjectMap<Pair<String, Byte>> FLOWERS = new Int2ObjectOpenHashMap<>(22, 0.99F);
+    private static final Pair<String, Byte> AIR = new Pair<>("minecraft:air", (byte) 0);
+
+    static {
+        FLOWERS.put(5265, AIR);
+        register(5266, "minecraft:sapling", (byte) 0);
+        register(5267, "minecraft:sapling", (byte) 1);
+        register(5268, "minecraft:sapling", (byte) 2);
+        register(5269, "minecraft:sapling", (byte) 3);
+        register(5270, "minecraft:sapling", (byte) 4);
+        register(5271, "minecraft:sapling", (byte) 5);
+        register(5272, "minecraft:tallgrass", (byte) 2);
+        register(5273, "minecraft:yellow_flower", (byte) 0);
+        register(5274, "minecraft:red_flower", (byte) 0);
+        register(5275, "minecraft:red_flower", (byte) 1);
+        register(5276, "minecraft:red_flower", (byte) 2);
+        register(5277, "minecraft:red_flower", (byte) 3);
+        register(5278, "minecraft:red_flower", (byte) 4);
+        register(5279, "minecraft:red_flower", (byte) 5);
+        register(5280, "minecraft:red_flower", (byte) 6);
+        register(5281, "minecraft:red_flower", (byte) 7);
+        register(5282, "minecraft:red_flower", (byte) 8);
+        register(5283, "minecraft:red_mushroom", (byte) 0);
+        register(5284, "minecraft:brown_mushroom", (byte) 0);
+        register(5285, "minecraft:deadbush", (byte) 0);
+        register(5286, "minecraft:cactus", (byte) 0);
+    }
+
+    private static void register(int id, String identifier, byte data) {
+        FLOWERS.put(id, new Pair<>(identifier, data));
+    }
+
+    public static boolean isFlowah(int id) {
+        return id >= 5265 && id <= 5286;
+    }
+
+    public Pair<String, Byte> getOrDefault(int blockId) {
+        Pair<String, Byte> pair = FLOWERS.get(blockId);
+        return pair != null ? pair : AIR;
+    }
+
+    // TODO THIS IS NEVER CALLED BECAUSE ITS NO LONGER A BLOCK ENTITY :(
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        Pair<String, Byte> item = getOrDefault(blockId);
+
+        tag.put("Item", new StringTag(item.getKey()));
+        tag.put("Data", new IntTag(item.getValue()));
+
+        return tag;
+    }
+
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/PistonHandler.java

@@ -0,0 +1,119 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.IntTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.blockconnections.ConnectionData;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.StringJoiner;
+
+public class PistonHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    private final Map<String, Integer> pistonIds = new HashMap<>();
+
+    public PistonHandler() {
+        if (Via.getConfig().isServersideBlockConnections()) {
+            Map<String, Integer> keyToId;
+            try {
+                Field field = ConnectionData.class.getDeclaredField("keyToId");
+                field.setAccessible(true);
+                keyToId = (Map<String, Integer>) field.get(null);
+            } catch (IllegalAccessException | NoSuchFieldException e) {
+                e.printStackTrace();
+                return;
+            }
+
+            for (Map.Entry<String, Integer> entry : keyToId.entrySet()) {
+                if (!entry.getKey().contains("piston")) continue;
+
+                addEntries(entry.getKey(), entry.getValue());
+            }
+        } else {
+            JsonObject mappings = MappingDataLoader.getMappingsCache().get("mapping-1.13.json").getAsJsonObject("blockstates");
+            for (Map.Entry<String, JsonElement> blockState : mappings.entrySet()) {
+                String key = blockState.getValue().getAsString();
+                if (!key.contains("piston")) continue;
+
+                addEntries(key, Integer.parseInt(blockState.getKey()));
+            }
+        }
+    }
+
+    // There doesn't seem to be a nicer way around it :(
+    private void addEntries(String data, int id) {
+        id = Protocol1_12_2To1_13.MAPPINGS.getNewBlockStateId(id);
+        pistonIds.put(data, id);
+
+        String substring = data.substring(10);
+        if (!substring.startsWith("piston") && !substring.startsWith("sticky_piston")) return;
+
+        // Swap properties and add them to the map
+        String[] split = data.substring(0, data.length() - 1).split("\\[");
+        String[] properties = split[1].split(",");
+        data = split[0] + "[" + properties[1] + "," + properties[0] + "]";
+        pistonIds.put(data, id);
+    }
+
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        CompoundTag blockState = tag.get("blockState");
+        if (blockState == null) return tag;
+
+        String dataFromTag = getDataFromTag(blockState);
+        if (dataFromTag == null) return tag;
+
+        Integer id = pistonIds.get(dataFromTag);
+        if (id == null) {
+            //TODO see why this could be null and if this is bad
+            return tag;
+        }
+
+        tag.put("blockId", new IntTag(id >> 4));
+        tag.put("blockData", new IntTag(id & 15));
+        return tag;
+    }
+
+    // The type hasn't actually been updated in the blockstorage, so we need to construct it
+    private String getDataFromTag(CompoundTag tag) {
+        StringTag name = tag.get("Name");
+        if (name == null) return null;
+
+        CompoundTag properties = tag.get("Properties");
+        if (properties == null) return name.getValue();
+
+        StringJoiner joiner = new StringJoiner(",", name.getValue() + "[", "]");
+        for (Map.Entry<String, Tag> entry : properties) {
+            if (!(entry.getValue() instanceof StringTag)) continue;
+            joiner.add(entry.getKey() + "=" + ((StringTag) entry.getValue()).getValue());
+        }
+        return joiner.toString();
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/SkullHandler.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider.BackwardsBlockEntityHandler;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.ByteTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+
+public class SkullHandler implements BackwardsBlockEntityHandler {
+    private static final int SKULL_START = 5447;
+
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        int diff = blockId - SKULL_START;
+        int pos = diff % 20;
+        byte type = (byte) Math.floor(diff / 20f);
+
+        // Set type
+        tag.put("SkullType", new ByteTag(type));
+
+        // Remove wall skulls
+        if (pos < 4) {
+            return tag;
+        }
+
+        // Add rotation for normal skulls
+        tag.put("Rot", new ByteTag((byte) ((pos - 4) & 255)));
+
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/block_entity_handlers/SpawnerHandler.java

@@ -0,0 +1,43 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.block_entity_handlers;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.EntityNameRewrites;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.providers.BackwardsBlockEntityProvider;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+
+public class SpawnerHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    @Override
+    public CompoundTag transform(UserConnection user, int blockId, CompoundTag tag) {
+        Tag dataTag = tag.get("SpawnData");
+        if (dataTag instanceof CompoundTag) {
+            CompoundTag data = (CompoundTag) dataTag;
+            Tag idTag = data.get("id");
+            if (idTag instanceof StringTag) {
+                StringTag s = (StringTag) idTag;
+                s.setValue(EntityNameRewrites.rewrite(s.getValue()));
+            }
+        }
+        return tag;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/BackwardsMappings.java

@@ -0,0 +1,152 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.data.VBMappings;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.data.IntArrayMappings;
+import com.viaversion.viaversion.api.data.MappingDataLoader;
+import com.viaversion.viaversion.api.data.Mappings;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntMap;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonPrimitive;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.Protocol1_13To1_12_2;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.data.StatisticMappings;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.Map;
+
+public class BackwardsMappings extends com.viaversion.viabackwards.api.data.BackwardsMappings {
+    private final Int2ObjectMap<String> statisticMappings = new Int2ObjectOpenHashMap<>();
+    private final Map<String, String> translateMappings = new HashMap<>();
+    private Mappings enchantmentMappings;
+
+    public BackwardsMappings() {
+        super("1.13", "1.12", Protocol1_13To1_12_2.class, true);
+    }
+
+    @Override
+    public void loadVBExtras(JsonObject oldMappings, JsonObject newMappings) {
+        enchantmentMappings = VBMappings.vbBuilder().warnOnMissing(false)
+                .unmapped(oldMappings.getAsJsonObject("enchantments")).mapped(newMappings.getAsJsonObject("enchantments")).build();
+        for (Map.Entry<String, Integer> entry : StatisticMappings.CUSTOM_STATS.entrySet()) {
+            statisticMappings.put(entry.getValue().intValue(), entry.getKey());
+        }
+        for (Map.Entry<String, String> entry : Protocol1_13To1_12_2.MAPPINGS.getTranslateMapping().entrySet()) {
+            translateMappings.put(entry.getValue(), entry.getKey());
+        }
+    }
+
+    // Has lots of compat layers, so we can't use the default Via method
+    private static void mapIdentifiers(int[] output, JsonObject newIdentifiers, JsonObject oldIdentifiers, JsonObject mapping) {
+        Object2IntMap<String> newIdentifierMap = MappingDataLoader.indexedObjectToMap(oldIdentifiers);
+        for (Map.Entry<String, JsonElement> entry : newIdentifiers.entrySet()) {
+            String key = entry.getValue().getAsString();
+            int value = newIdentifierMap.getInt(key);
+            short hardId = -1;
+            if (value == -1) {
+                JsonPrimitive replacement = mapping.getAsJsonPrimitive(key);
+                int propertyIndex;
+                if (replacement == null && (propertyIndex = key.indexOf('[')) != -1) {
+                    replacement = mapping.getAsJsonPrimitive(key.substring(0, propertyIndex));
+                }
+                if (replacement != null) {
+                    if (replacement.getAsString().startsWith("id:")) {
+                        String id = replacement.getAsString().replace("id:", "");
+                        hardId = Short.parseShort(id);
+                        value = newIdentifierMap.getInt(oldIdentifiers.getAsJsonPrimitive(id).getAsString());
+                    } else {
+                        value = newIdentifierMap.getInt(replacement.getAsString());
+                    }
+                }
+                if (value == -1) {
+                    if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                        if (replacement != null) {
+                            ViaBackwards.getPlatform().getLogger().warning("No key for " + entry.getValue() + "/" + replacement.getAsString() + " :( ");
+                        } else {
+                            ViaBackwards.getPlatform().getLogger().warning("No key for " + entry.getValue() + " :( ");
+                        }
+                    }
+                    continue;
+                }
+            }
+            output[Integer.parseInt(entry.getKey())] = hardId != -1 ? hardId : (short) value;
+        }
+    }
+
+    @Override
+    protected @Nullable Mappings loadFromObject(JsonObject oldMappings, JsonObject newMappings, @Nullable JsonObject diffMappings, String key) {
+        if (key.equals("blockstates")) {
+            int[] oldToNew = new int[8582];
+            Arrays.fill(oldToNew, -1);
+            mapIdentifiers(oldToNew, oldMappings.getAsJsonObject("blockstates"), newMappings.getAsJsonObject("blocks"), diffMappings.getAsJsonObject("blockstates"));
+            return IntArrayMappings.of(oldToNew, -1);
+        } else {
+            return super.loadFromObject(oldMappings, newMappings, diffMappings, key);
+        }
+    }
+
+    @Override
+    public int getNewBlockStateId(int id) {
+        int mappedId = super.getNewBlockStateId(id);
+
+        // https://github.com/ViaVersion/ViaBackwards/issues/290
+        switch (mappedId) {
+            case 1595:
+            case 1596:
+            case 1597:
+                return 1584; // brown mushroom block
+            case 1611:
+            case 1612:
+            case 1613:
+                return 1600; // red mushroom block
+            default:
+                return mappedId;
+        }
+    }
+
+    @Override
+    protected int checkValidity(int id, int mappedId, String type) {
+        // Don't warn for missing ids here
+        return mappedId;
+    }
+
+    @Override
+    protected boolean shouldWarnOnMissing(String key) {
+        return super.shouldWarnOnMissing(key) && !key.equals("items");
+    }
+
+    public Int2ObjectMap<String> getStatisticMappings() {
+        return statisticMappings;
+    }
+
+    public Map<String, String> getTranslateMappings() {
+        return translateMappings;
+    }
+
+    public Mappings getEnchantmentMappings() {
+        return enchantmentMappings;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/EntityNameRewrites.java

@@ -0,0 +1,59 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class EntityNameRewrites {
+    private static final Map<String, String> ENTITY_NAMES = new HashMap<>();
+
+    static {
+        // CHANGED NAMES IN 1.13
+        reg("commandblock_minecart", "command_block_minecart");
+        reg("ender_crystal", "end_crystal");
+        reg("evocation_fangs", "evoker_fangs");
+        reg("evocation_illager", "evoker");
+        reg("eye_of_ender_signal", "eye_of_ender");
+        reg("fireworks_rocket", "firework_rocket");
+        reg("illusion_illager", "illusioner");
+        reg("snowman", "snow_golem");
+        reg("villager_golem", "iron_golem");
+        reg("vindication_illager", "vindicator");
+        reg("xp_bottle", "experience_bottle");
+        reg("xp_orb", "experience_orb");
+    }
+
+
+    private static void reg(String past, String future) {
+        ENTITY_NAMES.put("minecraft:" + future, "minecraft:" + past);
+    }
+
+    public static String rewrite(String entName) {
+        String entityName = ENTITY_NAMES.get(entName);
+        if (entityName != null) {
+            return entityName;
+        }
+        entityName = ENTITY_NAMES.get("minecraft:" + entName);
+        if (entityName != null) {
+            return entityName;
+        } else
+            return entName;
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/EntityTypeMapping.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntOpenHashMap;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.data.EntityTypeRewriter;
+
+import java.lang.reflect.Field;
+
+public class EntityTypeMapping {
+    private static final Int2IntMap TYPES = new Int2IntOpenHashMap();
+
+    static {
+        TYPES.defaultReturnValue(-1);
+        try {
+            Field field = EntityTypeRewriter.class.getDeclaredField("ENTITY_TYPES");
+            field.setAccessible(true);
+            Int2IntMap entityTypes = (Int2IntMap) field.get(null);
+            for (Int2IntMap.Entry entry : entityTypes.int2IntEntrySet()) {
+                EntityTypeMapping.TYPES.put(entry.getIntValue(), entry.getIntKey());
+            }
+        } catch (NoSuchFieldException | IllegalAccessException ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    public static int getOldId(int type1_13) {
+        return TYPES.get(type1_13);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/NamedSoundMapping.java

@@ -0,0 +1,46 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.data.NamedSoundRewriter;
+
+import java.lang.reflect.Field;
+import java.util.HashMap;
+import java.util.Map;
+
+public class NamedSoundMapping {
+    private static final Map<String, String> SOUNDS = new HashMap<>();
+
+    static {
+        try {
+            Field field = NamedSoundRewriter.class.getDeclaredField("oldToNew");
+            field.setAccessible(true);
+            Map<String, String> sounds = (Map<String, String>) field.get(null);
+            sounds.forEach((sound1_12, sound1_13) -> NamedSoundMapping.SOUNDS.put(sound1_13, sound1_12));
+        } catch (NoSuchFieldException | IllegalAccessException ex) {
+            ex.printStackTrace();
+        }
+    }
+
+    public static String getOldId(String sound1_13) {
+        if (sound1_13.startsWith("minecraft:")) {
+            sound1_13 = sound1_13.substring(10);
+        }
+        return SOUNDS.get(sound1_13);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/PaintingMapping.java

@@ -0,0 +1,62 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectMap;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2ObjectOpenHashMap;
+
+public class PaintingMapping {
+    private static final Int2ObjectMap<String> PAINTINGS = new Int2ObjectOpenHashMap<>(26, 0.99F);
+
+    public static void init() {
+        add("Kebab");
+        add("Aztec");
+        add("Alban");
+        add("Aztec2");
+        add("Bomb");
+        add("Plant");
+        add("Wasteland");
+        add("Pool");
+        add("Courbet");
+        add("Sea");
+        add("Sunset");
+        add("Creebet");
+        add("Wanderer");
+        add("Graham");
+        add("Match");
+        add("Bust");
+        add("Stage");
+        add("Void");
+        add("SkullAndRoses");
+        add("Wither");
+        add("Fighters");
+        add("Pointer");
+        add("Pigscene");
+        add("BurningSkull");
+        add("Skeleton");
+        add("DonkeyKong");
+    }
+
+    private static void add(String motive) {
+        PAINTINGS.put(PAINTINGS.size(), motive);
+    }
+
+    public static String getStringId(int id) {
+        return PAINTINGS.getOrDefault(id, "kebab");
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/data/ParticleMapping.java

@@ -0,0 +1,204 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data;
+
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.Particle;
+
+import java.util.List;
+
+public class ParticleMapping {
+    private static final ParticleData[] particles;
+
+    static {
+        ParticleHandler blockHandler = new ParticleHandler() {
+            @Override
+            public int[] rewrite(Protocol1_12_2To1_13 protocol, PacketWrapper wrapper) throws Exception {
+                return rewrite(wrapper.read(Type.VAR_INT));
+            }
+
+            @Override
+            public int[] rewrite(Protocol1_12_2To1_13 protocol, List<Particle.ParticleData> data) {
+                return rewrite((int) data.get(0).getValue());
+            }
+
+            private int[] rewrite(int newType) {
+                int blockType = Protocol1_12_2To1_13.MAPPINGS.getNewBlockStateId(newType);
+
+                int type = blockType >> 4;
+                int meta = blockType & 15;
+                return new int[]{type + (meta << 12)};
+            }
+
+            @Override
+            public boolean isBlockHandler() {
+                return true;
+            }
+        };
+
+        particles = new ParticleData[]{
+                rewrite(16), // (0->16)  minecraft:ambient_entity_effect -> mobSpellAmbient
+                rewrite(20), // (1->20)  minecraft:angry_villager -> angryVillager
+                rewrite(35), // (2->35)  minecraft:barrier -> barrier
+                rewrite(37, blockHandler),
+                // (3->37)  minecraft:block -> blockcrack
+                rewrite(4),  // (4->4)   minecraft:bubble -> bubble
+                rewrite(29), // (5->29)  minecraft:cloud -> cloud
+                rewrite(9),  // (6->9)   minecraft:crit -> crit
+                rewrite(44), // (7->44)  minecraft:damage_indicator -> damageIndicator‌
+                rewrite(42), // (8->42)  minecraft:dragon_breath -> dragonbreath
+                rewrite(19), // (9->19)  minecraft:dripping_lava -> dripLava
+                rewrite(18), // (10->18) minecraft:dripping_water -> dripWater
+                rewrite(30, new ParticleHandler() {
+                    @Override
+                    public int[] rewrite(Protocol1_12_2To1_13 protocol, PacketWrapper wrapper) throws Exception {
+                        float r = wrapper.read(Type.FLOAT);
+                        float g = wrapper.read(Type.FLOAT);
+                        float b = wrapper.read(Type.FLOAT);
+                        float scale = wrapper.read(Type.FLOAT);
+
+                        wrapper.set(Type.FLOAT, 3, r); // 5 - Offset X index=3
+                        wrapper.set(Type.FLOAT, 4, g); // 6 - Offset Y index=4
+                        wrapper.set(Type.FLOAT, 5, b); // 7 - Offset Z index=5
+                        wrapper.set(Type.FLOAT, 6, scale); // 8 - Particle Data index=6
+                        wrapper.set(Type.INT, 1, 0); // 9 - Particle Count index=1 enable rgb particle
+
+                        return null;
+                    }
+
+                    @Override
+                    public int[] rewrite(Protocol1_12_2To1_13 protocol, List<Particle.ParticleData> data) {
+                        return null;
+                    }
+                }),         // (11->30) minecraft:dust -> reddust
+                rewrite(13), // (12->13) minecraft:effect -> spell
+                rewrite(41), // (13->41) minecraft:elder_guardian -> mobappearance
+                rewrite(10), // (14->10) minecraft:enchanted_hit -> magicCrit‌
+                rewrite(25), // (15->25) minecraft:enchant -> enchantmenttable
+                rewrite(43), // (16->43) minecraft:end_rod -> endRod
+                rewrite(15), // (17->15) minecraft:entity_effect -> mobSpell
+                rewrite(2),  // (18->2)  minecraft:explosion_emitter -> hugeexplosion
+                rewrite(1),  // (19->1)  minecraft:explosion -> largeexplode
+                rewrite(46, blockHandler),
+                // (20->46) minecraft:falling_dust -> fallingdust
+                rewrite(3),  // (21->3)  minecraft:firework -> fireworksSpark
+                rewrite(6),  // (22->6)  minecraft:fishing -> wake
+                rewrite(26), // (23->26) minecraft:flame -> flame
+                rewrite(21), // (24->21) minecraft:happy_villager -> happyVillager
+                rewrite(34), // (25->34) minecraft:heart -> heart
+                rewrite(14), // (26->14) minecraft:instant_effect -> instantSpell
+                rewrite(36, new ParticleHandler() {
+                    @Override
+                    public int[] rewrite(Protocol1_12_2To1_13 protocol, PacketWrapper wrapper) throws Exception {
+                        return rewrite(protocol, wrapper.read(Type.FLAT_ITEM));
+                    }
+
+                    @Override
+                    public int[] rewrite(Protocol1_12_2To1_13 protocol, List<Particle.ParticleData> data) {
+                        return rewrite(protocol, (Item) data.get(0).getValue());
+                    }
+
+                    private int[] rewrite(Protocol1_12_2To1_13 protocol, Item newItem) {
+                        Item item = protocol.getItemRewriter().handleItemToClient(newItem);
+                        return new int[]{item.identifier(), item.data()};
+                    }
+                }),          // (27->36) minecraft:item -> iconcrack
+                rewrite(33), // (28->33) minecraft:item_slime -> slime
+                rewrite(31), // (29->31) minecraft:item_snowball -> snowballpoof
+                rewrite(12), // (30->12) minecraft:large_smoke -> largesmoke
+                rewrite(27), // (31->27) minecraft:lava -> lava
+                rewrite(22), // (32->22) minecraft:mycelium -> townaura
+                rewrite(23), // (33->23) minecraft:note -> note
+                rewrite(0),  // (34->0)  minecraft:poof -> explode
+                rewrite(24), // (35->24) minecraft:portal -> portal
+                rewrite(39), // (36->39) minecraft:rain -> droplet
+                rewrite(11), // (37->11) minecraft:smoke -> smoke
+                rewrite(48), // (38->48) minecraft:spit -> spit
+                rewrite(12), // (39->-1) minecraft:squid_ink -> squid_ink -> large_smoke
+                rewrite(45), // (40->45) minecraft:sweep_attack -> sweepAttack‌
+                rewrite(47), // (41->47) minecraft:totem_of_undying -> totem
+                rewrite(7),  // (42->7)  minecraft:underwater -> suspended‌
+                rewrite(5),  // (43->5)  minecraft:splash -> splash
+                rewrite(17), // (44->17) minecraft:witch -> witchMagic
+                rewrite(4),  // (45->4)  minecraft:bubble_pop -> bubble
+                rewrite(4),  // (46->4)  minecraft:current_down -> bubble
+                rewrite(4),  // (47->4)  minecraft:bubble_column_up -> bubble
+                rewrite(18), // (48->-1) minecraft:nautilus -> nautilus -> dripWater
+                rewrite(18), // (49->18) minecraft:dolphin -> dripWater
+        };
+    }
+
+    public static ParticleData getMapping(int id) {
+        return particles[id];
+    }
+
+    private static ParticleData rewrite(int replacementId) {
+        return new ParticleData(replacementId);
+    }
+
+    private static ParticleData rewrite(int replacementId, ParticleHandler handler) {
+        return new ParticleData(replacementId, handler);
+    }
+
+    public interface ParticleHandler {
+
+        int[] rewrite(Protocol1_12_2To1_13 protocol, PacketWrapper wrapper) throws Exception;
+
+        int[] rewrite(Protocol1_12_2To1_13 protocol, List<Particle.ParticleData> data);
+
+        default boolean isBlockHandler() {
+            return false;
+        }
+    }
+
+    public static final class ParticleData {
+        private final int historyId;
+        private final ParticleHandler handler;
+
+        private ParticleData(int historyId, ParticleHandler handler) {
+            this.historyId = historyId;
+            this.handler = handler;
+        }
+
+        private ParticleData(int historyId) {
+            this(historyId, null);
+        }
+
+        public int[] rewriteData(Protocol1_12_2To1_13 protocol, PacketWrapper wrapper) throws Exception {
+            if (handler == null) return null;
+            return handler.rewrite(protocol, wrapper);
+        }
+
+        public int[] rewriteMeta(Protocol1_12_2To1_13 protocol, List<Particle.ParticleData> data) {
+            if (handler == null) return null;
+            return handler.rewrite(protocol, data);
+        }
+
+        public int getHistoryId() {
+            return historyId;
+        }
+
+        public ParticleHandler getHandler() {
+            return handler;
+        }
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/EntityPackets1_13.java

@@ -0,0 +1,411 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.api.entities.storage.EntityPositionHandler;
+import com.viaversion.viabackwards.api.rewriters.LegacyEntityRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.EntityTypeMapping;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.PaintingMapping;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.ParticleMapping;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.BackwardsBlockStorage;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.PlayerPositionStorage1_13;
+import com.viaversion.viaversion.api.minecraft.entities.Entity1_13Types;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_12;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.Particle;
+import com.viaversion.viaversion.api.type.types.version.Types1_12;
+import com.viaversion.viaversion.api.type.types.version.Types1_13;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ServerboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ClientboundPackets1_13;
+
+import java.util.Optional;
+
+public class EntityPackets1_13 extends LegacyEntityRewriter<Protocol1_12_2To1_13> {
+
+    public EntityPackets1_13(Protocol1_12_2To1_13 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_13.PLAYER_POSITION, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.FLOAT);
+                map(Type.FLOAT);
+                map(Type.BYTE);
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        if (!ViaBackwards.getConfig().isFix1_13FacePlayer()) return;
+
+                        PlayerPositionStorage1_13 playerStorage = wrapper.user().get(PlayerPositionStorage1_13.class);
+                        byte bitField = wrapper.get(Type.BYTE, 0);
+                        playerStorage.setX(toSet(bitField, 0, playerStorage.getX(), wrapper.get(Type.DOUBLE, 0)));
+                        playerStorage.setY(toSet(bitField, 1, playerStorage.getY(), wrapper.get(Type.DOUBLE, 1)));
+                        playerStorage.setZ(toSet(bitField, 2, playerStorage.getZ(), wrapper.get(Type.DOUBLE, 2)));
+                    }
+
+                    private double toSet(int field, int bitIndex, double origin, double packetValue) {
+                        // If bit is set, coordinate is relative
+                        return (field & (1 << bitIndex)) != 0 ? origin + packetValue : packetValue;
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SPAWN_ENTITY, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.UUID);
+                map(Type.BYTE);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.BYTE);
+                map(Type.BYTE);
+                map(Type.INT);
+
+                handler(getObjectTrackerHandler());
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        Optional<Entity1_13Types.ObjectType> optionalType = Entity1_13Types.ObjectType.findById(wrapper.get(Type.BYTE, 0));
+                        if (!optionalType.isPresent()) return;
+
+                        Entity1_13Types.ObjectType type = optionalType.get();
+                        if (type == Entity1_13Types.ObjectType.FALLING_BLOCK) {
+                            int blockState = wrapper.get(Type.INT, 0);
+                            int combined = Protocol1_12_2To1_13.MAPPINGS.getNewBlockStateId(blockState);
+                            combined = ((combined >> 4) & 0xFFF) | ((combined & 0xF) << 12);
+                            wrapper.set(Type.INT, 0, combined);
+                        } else if (type == Entity1_13Types.ObjectType.ITEM_FRAME) {
+                            int data = wrapper.get(Type.INT, 0);
+                            switch (data) {
+                                case 3:
+                                    data = 0;
+                                    break;
+                                case 4:
+                                    data = 1;
+                                    break;
+                                case 5:
+                                    data = 3;
+                                    break;
+                            }
+                            wrapper.set(Type.INT, 0, data);
+                        } else if (type == Entity1_13Types.ObjectType.TRIDENT) {
+                            wrapper.set(Type.BYTE, 0, (byte) Entity1_13Types.ObjectType.TIPPED_ARROW.getId());
+                        }
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_13.SPAWN_EXPERIENCE_ORB, Entity1_13Types.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_13.SPAWN_GLOBAL_ENTITY, Entity1_13Types.EntityType.LIGHTNING_BOLT);
+
+        protocol.registerClientbound(ClientboundPackets1_13.SPAWN_MOB, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.UUID);
+                map(Type.VAR_INT);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.BYTE);
+                map(Type.BYTE);
+                map(Type.BYTE);
+                map(Type.SHORT);
+                map(Type.SHORT);
+                map(Type.SHORT);
+                map(Types1_13.METADATA_LIST, Types1_12.METADATA_LIST);
+
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int type = wrapper.get(Type.VAR_INT, 1);
+                        EntityType entityType = Entity1_13Types.getTypeFromId(type, false);
+                        tracker(wrapper.user()).addEntity(wrapper.get(Type.VAR_INT, 0), entityType);
+
+                        int oldId = EntityTypeMapping.getOldId(type);
+                        if (oldId == -1) {
+                            if (!hasData(entityType)) {
+                                ViaBackwards.getPlatform().getLogger().warning("Could not find 1.12 entity type for 1.13 entity type " + type + "/" + entityType);
+                            }
+                        } else {
+                            wrapper.set(Type.VAR_INT, 1, oldId);
+                        }
+                    }
+                });
+
+                // Rewrite entity type / metadata
+                handler(getMobSpawnRewriter(Types1_12.METADATA_LIST));
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SPAWN_PLAYER, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.UUID);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.DOUBLE);
+                map(Type.BYTE);
+                map(Type.BYTE);
+                map(Types1_13.METADATA_LIST, Types1_12.METADATA_LIST);
+
+                handler(getTrackerAndMetaHandler(Types1_12.METADATA_LIST, Entity1_13Types.EntityType.PLAYER));
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SPAWN_PAINTING, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                map(Type.UUID);
+
+                handler(getTrackerHandler(Entity1_13Types.EntityType.PAINTING, Type.VAR_INT));
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int motive = wrapper.read(Type.VAR_INT);
+                        String title = PaintingMapping.getStringId(motive);
+                        wrapper.write(Type.STRING, title);
+                    }
+                });
+            }
+        });
+
+        registerJoinGame(ClientboundPackets1_13.JOIN_GAME, Entity1_13Types.EntityType.PLAYER);
+
+        protocol.registerClientbound(ClientboundPackets1_13.RESPAWN, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT); // 0 - Dimension ID
+
+                handler(getDimensionHandler(0));
+                handler(wrapper -> wrapper.user().get(BackwardsBlockStorage.class).clear());
+            }
+        });
+
+        registerRemoveEntities(ClientboundPackets1_13.DESTROY_ENTITIES);
+        registerMetadataRewriter(ClientboundPackets1_13.ENTITY_METADATA, Types1_13.METADATA_LIST, Types1_12.METADATA_LIST);
+
+        // Face Player (new packet)
+        protocol.registerClientbound(ClientboundPackets1_13.FACE_PLAYER, null, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        wrapper.cancel();
+
+                        if (!ViaBackwards.getConfig().isFix1_13FacePlayer()) return;
+
+                        // We will just accept a possible, very minor mismatch between server and client position,
+                        // and will take the server's one in both cases, else we would have to cache all entities' positions.
+                        final int anchor = wrapper.read(Type.VAR_INT); // feet/eyes enum
+                        final double x = wrapper.read(Type.DOUBLE);
+                        final double y = wrapper.read(Type.DOUBLE);
+                        final double z = wrapper.read(Type.DOUBLE);
+
+                        PlayerPositionStorage1_13 positionStorage = wrapper.user().get(PlayerPositionStorage1_13.class);
+
+                        // Send teleport packet to client
+                        PacketWrapper positionAndLook = wrapper.create(ClientboundPackets1_12_1.PLAYER_POSITION);
+                        positionAndLook.write(Type.DOUBLE, 0D);
+                        positionAndLook.write(Type.DOUBLE, 0D);
+                        positionAndLook.write(Type.DOUBLE, 0D);
+
+                        //TODO properly cache and calculate head position?
+                        EntityPositionHandler.writeFacingDegrees(positionAndLook, positionStorage.getX(),
+                                anchor == 1 ? positionStorage.getY() + 1.62 : positionStorage.getY(),
+                                positionStorage.getZ(), x, y, z);
+
+                        positionAndLook.write(Type.BYTE, (byte) 7); // bitfield, 0=absolute, 1=relative - x,y,z relative, yaw,pitch absolute
+                        positionAndLook.write(Type.VAR_INT, -1);
+                        positionAndLook.send(Protocol1_12_2To1_13.class);
+                    }
+                });
+            }
+        });
+
+        if (ViaBackwards.getConfig().isFix1_13FacePlayer()) {
+            PacketRemapper movementRemapper = new PacketRemapper() {
+                @Override
+                public void registerMap() {
+                    map(Type.DOUBLE);
+                    map(Type.DOUBLE);
+                    map(Type.DOUBLE);
+                    handler(wrapper -> wrapper.user().get(PlayerPositionStorage1_13.class).setCoordinates(wrapper, false));
+                }
+            };
+            protocol.registerServerbound(ServerboundPackets1_12_1.PLAYER_POSITION, movementRemapper); // Player Position
+            protocol.registerServerbound(ServerboundPackets1_12_1.PLAYER_POSITION_AND_ROTATION, movementRemapper); // Player Position And Look (serverbound)
+            protocol.registerServerbound(ServerboundPackets1_12_1.VEHICLE_MOVE, movementRemapper); // Vehicle Move (serverbound)
+        }
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Rewrite new Entity 'drowned'
+        mapEntityTypeWithData(Entity1_13Types.EntityType.DROWNED, Entity1_13Types.EntityType.ZOMBIE_VILLAGER).plainName();
+
+        // Fishy
+        mapEntityTypeWithData(Entity1_13Types.EntityType.COD, Entity1_13Types.EntityType.SQUID).plainName();
+        mapEntityTypeWithData(Entity1_13Types.EntityType.SALMON, Entity1_13Types.EntityType.SQUID).plainName();
+        mapEntityTypeWithData(Entity1_13Types.EntityType.PUFFERFISH, Entity1_13Types.EntityType.SQUID).plainName();
+        mapEntityTypeWithData(Entity1_13Types.EntityType.TROPICAL_FISH, Entity1_13Types.EntityType.SQUID).plainName();
+
+        // Phantom
+        mapEntityTypeWithData(Entity1_13Types.EntityType.PHANTOM, Entity1_13Types.EntityType.PARROT).plainName().spawnMetadata(storage -> {
+            // The phantom is grey/blue so let's do yellow/blue
+            storage.add(new Metadata(15, MetaType1_12.VarInt, 3));
+        });
+
+        // Dolphin
+        mapEntityTypeWithData(Entity1_13Types.EntityType.DOLPHIN, Entity1_13Types.EntityType.SQUID).plainName();
+
+        // Turtle
+        mapEntityTypeWithData(Entity1_13Types.EntityType.TURTLE, Entity1_13Types.EntityType.OCELOT).plainName();
+
+        // Rewrite Meta types
+        filter().handler((event, meta) -> {
+            int typeId = meta.metaType().typeId();
+
+            // Rewrite optional chat to string
+            if (typeId == 5) {
+                // Json -> Legacy is done below
+                meta.setTypeAndValue(MetaType1_12.String, meta.getValue() != null ? meta.getValue().toString() : "");
+            }
+
+            // Rewrite items
+            else if (typeId == 6) {
+                Item item = (Item) meta.getValue();
+                meta.setTypeAndValue(MetaType1_12.Slot, protocol.getItemRewriter().handleItemToClient(item));
+            }
+
+            // Discontinue particles
+            else if (typeId == 15) {
+                event.cancel();
+            }
+
+            // Rewrite to 1.12 ids
+            else if (typeId > 5) {
+                meta.setMetaType(MetaType1_12.byId(
+                        typeId - 1
+                ));
+            }
+        });
+
+        // Rewrite Custom Name from Chat to String
+        filter().filterFamily(Entity1_13Types.EntityType.ENTITY).index(2).handler((event, meta) -> {
+            String value = meta.getValue().toString();
+            if (!value.isEmpty()) {
+                meta.setValue(ChatRewriter.jsonToLegacyText(value));
+            }
+        });
+
+        // Handle zombie metadata
+        filter().filterFamily(Entity1_13Types.EntityType.ZOMBIE).removeIndex(15);
+
+        // Handle turtle metadata (Remove them all for now)
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(13); // Home pos
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(14); // Has egg
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(15); // Laying egg
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(16); // Travel pos
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(17); // Going home
+        filter().type(Entity1_13Types.EntityType.TURTLE).cancel(18); // Traveling
+
+        // Remove additional fish meta
+        filter().filterFamily(Entity1_13Types.EntityType.ABSTRACT_FISHES).cancel(12);
+        filter().filterFamily(Entity1_13Types.EntityType.ABSTRACT_FISHES).cancel(13);
+
+        // Remove phantom size
+        filter().type(Entity1_13Types.EntityType.PHANTOM).cancel(12);
+
+        // Remove boat splash timer
+        filter().type(Entity1_13Types.EntityType.BOAT).cancel(12);
+
+        // Remove Trident special loyalty level
+        filter().type(Entity1_13Types.EntityType.TRIDENT).cancel(7);
+
+        // Handle new wolf colors
+        filter().type(Entity1_13Types.EntityType.WOLF).index(17).handler((event, meta) -> {
+            meta.setValue(15 - (int) meta.getValue());
+        });
+
+        // Rewrite AreaEffectCloud
+        filter().type(Entity1_13Types.EntityType.AREA_EFFECT_CLOUD).index(9).handler((event, meta) -> {
+            Particle particle = (Particle) meta.getValue();
+
+            ParticleMapping.ParticleData data = ParticleMapping.getMapping(particle.getId());
+
+            int firstArg = 0;
+            int secondArg = 0;
+            int[] particleArgs = data.rewriteMeta(protocol, particle.getArguments());
+            if (particleArgs != null && particleArgs.length != 0) {
+                if (data.getHandler().isBlockHandler() && particleArgs[0] == 0) {
+                    // Air doesn't have a break particle for sub 1.13 clients -> glass pane
+                    particleArgs[0] = 102;
+                }
+
+                firstArg = particleArgs[0];
+                secondArg = particleArgs.length == 2 ? particleArgs[1] : 0;
+            }
+
+            event.createExtraMeta(new Metadata(9, MetaType1_12.VarInt, data.getHistoryId()));
+            event.createExtraMeta(new Metadata(10, MetaType1_12.VarInt, firstArg));
+            event.createExtraMeta(new Metadata(11, MetaType1_12.VarInt, secondArg));
+
+            event.cancel();
+        });
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return Entity1_13Types.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    protected EntityType getObjectTypeFromId(final int typeId) {
+        return Entity1_13Types.getTypeFromId(typeId, true);
+    }
+
+    @Override
+    public int newEntityId(final int newId) {
+        return EntityTypeMapping.getOldId(newId);
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/PlayerPacket1_13.java

@@ -0,0 +1,652 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets;
+
+import com.google.common.base.Joiner;
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.ParticleMapping;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.storage.TabCompleteStorage;
+import com.viaversion.viabackwards.utils.ChatUtil;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.minecraft.Position;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.protocol.packet.State;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.rewriter.RewriterBase;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ServerboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ChatRewriter;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ClientboundPackets1_13;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.packets.InventoryPackets;
+import com.viaversion.viaversion.rewriter.CommandRewriter;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+
+public class PlayerPacket1_13 extends RewriterBase<Protocol1_12_2To1_13> {
+
+    private final CommandRewriter commandRewriter = new CommandRewriter(protocol) {
+    };
+
+    public PlayerPacket1_13(Protocol1_12_2To1_13 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        // Login Plugin Request
+        protocol.registerClientbound(State.LOGIN, 0x04, -1, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper packetWrapper) throws Exception {
+                        packetWrapper.cancel();
+                        packetWrapper.create(0x02, new PacketHandler() { // Plugin response
+                            @Override
+                            public void handle(PacketWrapper newWrapper) throws Exception {
+                                newWrapper.write(Type.VAR_INT, packetWrapper.read(Type.VAR_INT)); // Packet id
+                                newWrapper.write(Type.BOOLEAN, false); // Success
+                            }
+                        }).sendToServer(Protocol1_12_2To1_13.class);
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        String channel = wrapper.read(Type.STRING);
+                        if (channel.equals("minecraft:trader_list")) {
+                            wrapper.write(Type.STRING, "MC|TrList");
+                            wrapper.passthrough(Type.INT); //Passthrough Window ID
+
+                            int size = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                            for (int i = 0; i < size; i++) {
+                                //Input Item
+                                Item input = wrapper.read(Type.FLAT_ITEM);
+                                wrapper.write(Type.ITEM, protocol.getItemRewriter().handleItemToClient(input));
+                                //Output Item
+                                Item output = wrapper.read(Type.FLAT_ITEM);
+                                wrapper.write(Type.ITEM, protocol.getItemRewriter().handleItemToClient(output));
+
+                                boolean secondItem = wrapper.passthrough(Type.BOOLEAN); //Has second item
+                                if (secondItem) {
+                                    //Second Item
+                                    Item second = wrapper.read(Type.FLAT_ITEM);
+                                    wrapper.write(Type.ITEM, protocol.getItemRewriter().handleItemToClient(second));
+                                }
+
+                                wrapper.passthrough(Type.BOOLEAN); //Trade disabled
+                                wrapper.passthrough(Type.INT); //Number of tools uses
+                                wrapper.passthrough(Type.INT); //Maximum number of trade uses
+                            }
+                        } else {
+                            String oldChannel = InventoryPackets.getOldPluginChannelId(channel);
+                            if (oldChannel == null) {
+                                if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                                    ViaBackwards.getPlatform().getLogger().warning("Ignoring outgoing plugin message with channel: " + channel);
+                                }
+                                wrapper.cancel();
+                                return;
+                            }
+                            wrapper.write(Type.STRING, oldChannel);
+
+                            if (oldChannel.equals("REGISTER") || oldChannel.equals("UNREGISTER")) {
+                                String[] channels = new String(wrapper.read(Type.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                                List<String> rewrittenChannels = new ArrayList<>();
+                                for (String s : channels) {
+                                    String rewritten = InventoryPackets.getOldPluginChannelId(s);
+                                    if (rewritten != null) {
+                                        rewrittenChannels.add(rewritten);
+                                    } else if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                                        ViaBackwards.getPlatform().getLogger().warning("Ignoring plugin channel in outgoing REGISTER: " + s);
+                                    }
+                                }
+                                wrapper.write(Type.REMAINING_BYTES, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SPAWN_PARTICLE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.INT);      // 0 - Particle ID
+                map(Type.BOOLEAN);  // 1 - Long Distance
+                map(Type.FLOAT);    // 2 - X
+                map(Type.FLOAT);    // 3 - Y
+                map(Type.FLOAT);    // 4 - Z
+                map(Type.FLOAT);    // 5 - Offset X
+                map(Type.FLOAT);    // 6 - Offset Y
+                map(Type.FLOAT);    // 7 - Offset Z
+                map(Type.FLOAT);    // 8 - Particle Data
+                map(Type.INT);      // 9 - Particle Count
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        ParticleMapping.ParticleData old = ParticleMapping.getMapping(wrapper.get(Type.INT, 0));
+                        wrapper.set(Type.INT, 0, old.getHistoryId());
+
+                        int[] data = old.rewriteData(protocol, wrapper);
+                        if (data != null) {
+                            if (old.getHandler().isBlockHandler() && data[0] == 0) {
+                                // Cancel air block particles
+                                wrapper.cancel();
+                                return;
+                            }
+
+                            for (int i : data) {
+                                wrapper.write(Type.VAR_INT, i);
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.PLAYER_INFO, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper packetWrapper) throws Exception {
+                        TabCompleteStorage storage = packetWrapper.user().get(TabCompleteStorage.class);
+                        int action = packetWrapper.passthrough(Type.VAR_INT);
+                        int nPlayers = packetWrapper.passthrough(Type.VAR_INT);
+                        for (int i = 0; i < nPlayers; i++) {
+                            UUID uuid = packetWrapper.passthrough(Type.UUID);
+                            if (action == 0) { // Add
+                                String name = packetWrapper.passthrough(Type.STRING);
+                                storage.usernames().put(uuid, name);
+                                int nProperties = packetWrapper.passthrough(Type.VAR_INT);
+                                for (int j = 0; j < nProperties; j++) {
+                                    packetWrapper.passthrough(Type.STRING);
+                                    packetWrapper.passthrough(Type.STRING);
+                                    if (packetWrapper.passthrough(Type.BOOLEAN)) {
+                                        packetWrapper.passthrough(Type.STRING);
+                                    }
+                                }
+                                packetWrapper.passthrough(Type.VAR_INT);
+                                packetWrapper.passthrough(Type.VAR_INT);
+                                if (packetWrapper.passthrough(Type.BOOLEAN)) {
+                                    packetWrapper.passthrough(Type.COMPONENT);
+                                }
+                            } else if (action == 1) { // Update Game Mode
+                                packetWrapper.passthrough(Type.VAR_INT);
+                            } else if (action == 2) { // Update Ping
+                                packetWrapper.passthrough(Type.VAR_INT);
+                            } else if (action == 3) { // Update Display Name
+                                if (packetWrapper.passthrough(Type.BOOLEAN)) {
+                                    packetWrapper.passthrough(Type.COMPONENT);
+                                }
+                            } else if (action == 4) { // Remove Player
+                                storage.usernames().remove(uuid);
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SCOREBOARD_OBJECTIVE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING);
+                map(Type.BYTE);
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        byte mode = wrapper.get(Type.BYTE, 0);
+                        if (mode == 0 || mode == 2) {
+                            String value = wrapper.read(Type.COMPONENT).toString();
+                            value = ChatRewriter.jsonToLegacyText(value);
+                            if (value.length() > 32) {
+                                value = value.substring(0, 32);
+                            }
+
+                            wrapper.write(Type.STRING, value);
+                            int type = wrapper.read(Type.VAR_INT);
+                            wrapper.write(Type.STRING, type == 1 ? "hearts" : "integer");
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.TEAMS, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING);
+                map(Type.BYTE);
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        byte action = wrapper.get(Type.BYTE, 0);
+                        if (action == 0 || action == 2) {
+                            String displayName = wrapper.read(Type.STRING);
+                            displayName = ChatRewriter.jsonToLegacyText(displayName);
+                            displayName = ChatUtil.removeUnusedColor(displayName, 'f');
+                            if (displayName.length() > 32) {
+                                displayName = displayName.substring(0, 32);
+                            }
+                            wrapper.write(Type.STRING, displayName);
+
+                            byte flags = wrapper.read(Type.BYTE);
+                            String nameTagVisibility = wrapper.read(Type.STRING);
+                            String collisionRule = wrapper.read(Type.STRING);
+
+                            int colour = wrapper.read(Type.VAR_INT);
+                            if (colour == 21) {
+                                colour = -1;
+                            }
+
+                            JsonElement prefixComponent = wrapper.read(Type.COMPONENT);
+                            JsonElement suffixComponent = wrapper.read(Type.COMPONENT);
+
+                            String prefix = prefixComponent == null || prefixComponent.isJsonNull() ? "" : ChatRewriter.jsonToLegacyText(prefixComponent.toString());
+                            if (ViaBackwards.getConfig().addTeamColorTo1_13Prefix()) {
+                                prefix += "§" + (colour > -1 && colour <= 15 ? Integer.toHexString(colour) : "r");
+                            }
+
+                            prefix = ChatUtil.removeUnusedColor(prefix, 'f', true);
+                            if (prefix.length() > 16) prefix = prefix.substring(0, 16);
+                            if (prefix.endsWith("§")) prefix = prefix.substring(0, prefix.length() - 1);
+
+                            String suffix = suffixComponent == null || suffixComponent.isJsonNull() ? "" : ChatRewriter.jsonToLegacyText(suffixComponent.toString());
+                            suffix = ChatUtil.removeUnusedColor(suffix, '\0'); // Don't remove white coloring
+                            if (suffix.length() > 16) suffix = suffix.substring(0, 16);
+                            if (suffix.endsWith("§")) suffix = suffix.substring(0, suffix.length() - 1);
+
+                            wrapper.write(Type.STRING, prefix);
+                            wrapper.write(Type.STRING, suffix);
+
+                            wrapper.write(Type.BYTE, flags);
+                            wrapper.write(Type.STRING, nameTagVisibility);
+                            wrapper.write(Type.STRING, collisionRule);
+
+                            wrapper.write(Type.BYTE, (byte) colour);
+                        }
+
+                        if (action == 0 || action == 3 || action == 4) {
+                            wrapper.passthrough(Type.STRING_ARRAY); //Entities
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.DECLARE_COMMANDS, null, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    wrapper.cancel();
+
+                    TabCompleteStorage storage = wrapper.user().get(TabCompleteStorage.class);
+
+                    if (!storage.commands().isEmpty()) {
+                        storage.commands().clear();
+                    }
+
+                    int size = wrapper.read(Type.VAR_INT);
+                    boolean initialNodes = true;
+                    for (int i = 0; i < size; i++) {
+                        byte flags = wrapper.read(Type.BYTE);
+                        wrapper.read(Type.VAR_INT_ARRAY_PRIMITIVE); // Children indices
+                        if ((flags & 0x08) != 0) {
+                            wrapper.read(Type.VAR_INT); // Redirect node index
+                        }
+
+                        byte nodeType = (byte) (flags & 0x03);
+                        if (initialNodes && nodeType == 2) {
+                            initialNodes = false;
+                        }
+
+                        if (nodeType == 1 || nodeType == 2) { // Literal/argument node
+                            String name = wrapper.read(Type.STRING);
+                            if (nodeType == 1 && initialNodes) {
+                                storage.commands().add('/' + name);
+                            }
+                        }
+
+                        if (nodeType == 2) { // Argument node
+                            commandRewriter.handleArgument(wrapper, wrapper.read(Type.STRING));
+                        }
+
+                        if ((flags & 0x10) != 0) {
+                            wrapper.read(Type.STRING); // Suggestion type
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.TAB_COMPLETE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        TabCompleteStorage storage = wrapper.user().get(TabCompleteStorage.class);
+                        if (storage.lastRequest() == null) {
+                            wrapper.cancel();
+                            return;
+                        }
+                        if (storage.lastId() != wrapper.read(Type.VAR_INT)) wrapper.cancel();
+                        int start = wrapper.read(Type.VAR_INT);
+                        int length = wrapper.read(Type.VAR_INT);
+
+                        int lastRequestPartIndex = storage.lastRequest().lastIndexOf(' ') + 1;
+                        if (lastRequestPartIndex != start) wrapper.cancel(); // Client only replaces after space
+
+                        if (length != storage.lastRequest().length() - lastRequestPartIndex) {
+                            wrapper.cancel(); // We can't set the length in previous versions
+                        }
+
+                        int count = wrapper.passthrough(Type.VAR_INT);
+                        for (int i = 0; i < count; i++) {
+                            String match = wrapper.read(Type.STRING);
+                            wrapper.write(Type.STRING, (start == 0 && !storage.isLastAssumeCommand() ? "/" : "") + match);
+                            // Ignore tooltip
+                            if (wrapper.read(Type.BOOLEAN)) {
+                                wrapper.read(Type.STRING);
+                            }
+                        }
+                    }
+                });
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_12_1.TAB_COMPLETE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    TabCompleteStorage storage = wrapper.user().get(TabCompleteStorage.class);
+                    List<String> suggestions = new ArrayList<>();
+
+                    String command = wrapper.read(Type.STRING);
+                    boolean assumeCommand = wrapper.read(Type.BOOLEAN);
+                    wrapper.read(Type.OPTIONAL_POSITION);
+
+                    if (!assumeCommand && !command.startsWith("/")) {
+                        // Complete usernames for non-commands
+                        String buffer = command.substring(command.lastIndexOf(' ') + 1);
+                        for (String value : storage.usernames().values()) {
+                            if (startsWithIgnoreCase(value, buffer)) {
+                                suggestions.add(value);
+                            }
+                        }
+                    } else if (!storage.commands().isEmpty() && !command.contains(" ")) {
+                        // Complete commands names with values from 'Declare Commands' packet
+                        for (String value : storage.commands()) {
+                            if (startsWithIgnoreCase(value, command)) {
+                                suggestions.add(value);
+                            }
+                        }
+                    }
+
+                    if (!suggestions.isEmpty()) {
+                        wrapper.cancel();
+                        PacketWrapper response = wrapper.create(ClientboundPackets1_12_1.TAB_COMPLETE);
+                        response.write(Type.VAR_INT, suggestions.size());
+                        for (String value : suggestions) {
+                            response.write(Type.STRING, value);
+                        }
+                        response.scheduleSend(Protocol1_12_2To1_13.class);
+                        storage.setLastRequest(null);
+                        return;
+                    }
+
+                    if (!assumeCommand && command.startsWith("/")) {
+                        command = command.substring(1);
+                    }
+
+                    int id = ThreadLocalRandom.current().nextInt();
+                    wrapper.write(Type.VAR_INT, id);
+                    wrapper.write(Type.STRING, command);
+
+                    storage.setLastId(id);
+                    storage.setLastAssumeCommand(assumeCommand);
+                    storage.setLastRequest(command);
+                });
+            }
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_12_1.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    String channel = wrapper.read(Type.STRING);
+                    switch (channel) {
+                        case "MC|BSign":
+                        case "MC|BEdit":
+                            wrapper.setId(0x0B);
+                            Item book = wrapper.read(Type.ITEM);
+                            wrapper.write(Type.FLAT_ITEM, protocol.getItemRewriter().handleItemToServer(book));
+                            boolean signing = channel.equals("MC|BSign");
+                            wrapper.write(Type.BOOLEAN, signing);
+                            break;
+                        case "MC|ItemName":
+                            wrapper.setId(0x1C);
+                            break;
+                        case "MC|AdvCmd":
+                            byte type = wrapper.read(Type.BYTE);
+                            if (type == 0) {
+                                //Information from https://wiki.vg/index.php?title=Plugin_channels&oldid=14089
+                                //The Notchain client only uses this for command block minecarts and uses MC|AutoCmd for blocks, but the Notchian server still accepts it for either.
+                                //Maybe older versions used this and we need to implement this? The issues is that we would have to save the command block types
+                                wrapper.setId(0x22);
+                                wrapper.cancel();
+                                ViaBackwards.getPlatform().getLogger().warning("Client send MC|AdvCmd custom payload to update command block, weird!");
+                            } else if (type == 1) {
+                                wrapper.setId(0x23);
+                                wrapper.write(Type.VAR_INT, wrapper.read(Type.INT)); //Entity Id
+                                wrapper.passthrough(Type.STRING); //Command
+                                wrapper.passthrough(Type.BOOLEAN); //Track Output
+
+                            } else {
+                                wrapper.cancel();
+                            }
+                            break;
+                        case "MC|AutoCmd": {
+                            wrapper.setId(0x22);
+
+                            int x = wrapper.read(Type.INT);
+                            int y = wrapper.read(Type.INT);
+                            int z = wrapper.read(Type.INT);
+
+                            wrapper.write(Type.POSITION, new Position(x, (short) y, z));
+
+                            wrapper.passthrough(Type.STRING);  //Command
+
+                            byte flags = 0;
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x01; //Track Output
+
+                            String mode = wrapper.read(Type.STRING);
+
+                            int modeId = mode.equals("SEQUENCE") ? 0 : mode.equals("AUTO") ? 1 : 2;
+                            wrapper.write(Type.VAR_INT, modeId);
+
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x02; //Is conditional
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x04; //Automatic
+
+                            wrapper.write(Type.BYTE, flags);
+                            break;
+                        }
+                        case "MC|Struct": {
+                            wrapper.setId(0x25);
+                            int x = wrapper.read(Type.INT);
+                            int y = wrapper.read(Type.INT);
+                            int z = wrapper.read(Type.INT);
+                            wrapper.write(Type.POSITION, new Position(x, (short) y, z));
+                            wrapper.write(Type.VAR_INT, wrapper.read(Type.BYTE) - 1);
+                            String mode = wrapper.read(Type.STRING);
+                            int modeId = mode.equals("SAVE") ? 0 : mode.equals("LOAD") ? 1 : mode.equals("CORNER") ? 2 : 3;
+                            wrapper.write(Type.VAR_INT, modeId);
+                            wrapper.passthrough(Type.STRING); //Name
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Offset X
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Offset Y
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Offset Z
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Size X
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Size Y
+
+                            wrapper.write(Type.BYTE, wrapper.read(Type.INT).byteValue()); //Size Z
+
+                            String mirror = wrapper.read(Type.STRING);
+                            int mirrorId = mode.equals("NONE") ? 0 : mode.equals("LEFT_RIGHT") ? 1 : 2;
+                            String rotation = wrapper.read(Type.STRING);
+                            int rotationId = mode.equals("NONE") ? 0 : mode.equals("CLOCKWISE_90") ? 1 : mode.equals("CLOCKWISE_180") ? 2 : 3;
+                            wrapper.passthrough(Type.STRING); //Metadata
+
+                            byte flags = 0;
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x01; //Ignore entities
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x02; //Show air
+                            if (wrapper.read(Type.BOOLEAN)) flags |= 0x04; //Show bounding box
+                            wrapper.passthrough(Type.FLOAT); //Integrity
+
+                            wrapper.passthrough(Type.VAR_LONG); //Seed
+
+                            wrapper.write(Type.BYTE, flags);
+                            break;
+                        }
+                        case "MC|Beacon":
+                            wrapper.setId(0x20);
+                            wrapper.write(Type.VAR_INT, wrapper.read(Type.INT)); //Primary Effect
+
+                            wrapper.write(Type.VAR_INT, wrapper.read(Type.INT)); //Secondary Effect
+
+                            break;
+                        case "MC|TrSel":
+                            wrapper.setId(0x1F);
+                            wrapper.write(Type.VAR_INT, wrapper.read(Type.INT)); //Slot
+
+                            break;
+                        case "MC|PickItem":
+                            wrapper.setId(0x15);
+                            break;
+                        default:
+                            String newChannel = InventoryPackets.getNewPluginChannelId(channel);
+                            if (newChannel == null) {
+                                if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                                    ViaBackwards.getPlatform().getLogger().warning("Ignoring incoming plugin message with channel: " + channel);
+                                }
+                                wrapper.cancel();
+                                return;
+                            }
+                            wrapper.write(Type.STRING, newChannel);
+
+                            if (newChannel.equals("minecraft:register") || newChannel.equals("minecraft:unregister")) {
+                                String[] channels = new String(wrapper.read(Type.REMAINING_BYTES), StandardCharsets.UTF_8).split("\0");
+                                List<String> rewrittenChannels = new ArrayList<>();
+                                for (String s : channels) {
+                                    String rewritten = InventoryPackets.getNewPluginChannelId(s);
+                                    if (rewritten != null) {
+                                        rewrittenChannels.add(rewritten);
+                                    } else if (!Via.getConfig().isSuppressConversionWarnings() || Via.getManager().isDebug()) {
+                                        ViaBackwards.getPlatform().getLogger().warning("Ignoring plugin channel in incoming REGISTER: " + s);
+                                    }
+                                }
+                                if (!rewrittenChannels.isEmpty()) {
+                                    wrapper.write(Type.REMAINING_BYTES, Joiner.on('\0').join(rewrittenChannels).getBytes(StandardCharsets.UTF_8));
+                                } else {
+                                    wrapper.cancel();
+                                    return;
+                                }
+                            }
+                            break;
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.STATISTICS, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                handler(new PacketHandler() {
+                    @Override
+                    public void handle(PacketWrapper wrapper) throws Exception {
+                        int size = wrapper.get(Type.VAR_INT, 0);
+                        int newSize = size;
+                        for (int i = 0; i < size; i++) {
+                            int categoryId = wrapper.read(Type.VAR_INT);
+                            int statisticId = wrapper.read(Type.VAR_INT);
+
+                            String name = "";
+                            // categories 0-7 (items, blocks, entities) - probably not feasible
+                            switch (categoryId) {
+                                case 0:
+                                case 1:
+                                case 2:
+                                case 3:
+                                case 4:
+                                case 5:
+                                case 6:
+                                case 7:
+                                    wrapper.read(Type.VAR_INT); // remove value
+                                    newSize--;
+                                    continue;
+                                case 8:
+                                    name = protocol.getMappingData().getStatisticMappings().get(statisticId);
+                                    if (name == null) {
+                                        wrapper.read(Type.VAR_INT);
+                                        newSize--;
+                                        continue;
+                                    }
+                                    break;
+                            }
+
+                            wrapper.write(Type.STRING, name); // string id
+                            wrapper.passthrough(Type.VAR_INT); // value
+                        }
+
+                        if (newSize != size) {
+                            wrapper.set(Type.VAR_INT, 0, newSize);
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    private static boolean startsWithIgnoreCase(String string, String prefix) {
+        if (string.length() < prefix.length()) {
+            return false;
+        }
+        return string.regionMatches(true, 0, prefix, 0, prefix.length());
+    }
+}

common/src/main/java/com/viaversion/viabackwards/protocol/protocol1_12_2to1_13/packets/SoundPackets1_13.java

@@ -0,0 +1,102 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2021 ViaVersion and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.packets;
+
+import com.viaversion.viabackwards.ViaBackwards;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.Protocol1_12_2To1_13;
+import com.viaversion.viabackwards.protocol.protocol1_12_2to1_13.data.NamedSoundMapping;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.protocol.remapper.PacketRemapper;
+import com.viaversion.viaversion.api.rewriter.RewriterBase;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.protocols.protocol1_12_1to1_12.ClientboundPackets1_12_1;
+import com.viaversion.viaversion.protocols.protocol1_13to1_12_2.ClientboundPackets1_13;
+
+public class SoundPackets1_13 extends RewriterBase<Protocol1_12_2To1_13> {
+    private static final String[] SOUND_SOURCES = {"master", "music", "record", "weather", "block", "hostile", "neutral", "player", "ambient", "voice"};
+
+    public SoundPackets1_13(Protocol1_12_2To1_13 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_13.NAMED_SOUND, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.STRING);
+                handler(wrapper -> {
+                    String newSound = wrapper.get(Type.STRING, 0);
+                    String oldSound = NamedSoundMapping.getOldId(newSound);
+                    if (oldSound != null || (oldSound = protocol.getMappingData().getMappedNamedSound(newSound)) != null) {
+                        wrapper.set(Type.STRING, 0, oldSound);
+                    } else if (!Via.getConfig().isSuppressConversionWarnings()) {
+                        ViaBackwards.getPlatform().getLogger().warning("Unknown named sound in 1.13->1.12 protocol: " + newSound);
+                    }
+                });
+            }
+        });
+
+        // Stop Sound -> Plugin Message
+        protocol.registerClientbound(ClientboundPackets1_13.STOP_SOUND, ClientboundPackets1_12_1.PLUGIN_MESSAGE, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(wrapper -> {
+                    wrapper.write(Type.STRING, "MC|StopSound");
+                    byte flags = wrapper.read(Type.BYTE);
+                    String source;
+                    if ((flags & 0x01) != 0) {
+                        source = SOUND_SOURCES[wrapper.read(Type.VAR_INT)];
+                    } else {
+                        source = "";
+                    }
+
+                    String sound;
+                    if ((flags & 0x02) != 0) {
+                        String newSound = wrapper.read(Type.STRING);
+                        sound = protocol.getMappingData().getMappedNamedSound(newSound);
+                        if (sound == null) {
+                            sound = "";
+                        }
+                    } else {
+                        sound = "";
+                    }
+
+                    wrapper.write(Type.STRING, source);
+                    wrapper.write(Type.STRING, sound);
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_13.SOUND, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                map(Type.VAR_INT);
+                handler(wrapper -> {
+                    int newSound = wrapper.get(Type.VAR_INT, 0);
+                    int oldSound = protocol.getMappingData().getSoundMappings().getNewId(newSound);
+                    if (oldSound == -1) {
+                        wrapper.cancel();
+                    } else {
+                        wrapper.set(Type.VAR_INT, 0, oldSound);
+                    }
+                });
+            }
+        });
+    }
+}