4.10.2 Release

Fixes #741

.editorconfig

@@ -0,0 +1,16 @@
+[*]
+charset = utf-8
+indent_size = 4
+indent_style = space
+insert_final_newline = false
+tab_width = 4
+
+[*.java]
+ij_java_class_count_to_use_import_on_demand = 999999
+ij_java_names_count_to_use_import_on_demand = 999999
+ij_java_imports_layout = *,|,$*
+ij_java_generate_final_locals = true
+ij_java_generate_final_parameters = true
+
+[{*.json,*.yml}]
+indent_size = 2

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+github: kennytv
+patreon: kennytv

.github/ISSUE_TEMPLATE.md

@@ -1,17 +0,0 @@
-##### What version of ViaBackwards are you using? Type /ver ViaBackwards:
-
-
-##### What version of ViaVersion are you using? Type /ver ViaVersion:
-
-
-##### What version of Spigot are you using? Type /ver:
-
-
-##### What plugins are you using? Type /plugins:
-
-
-##### 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://mclo.gs/ 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 mclo.gs 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 +1,38 @@
+name: Feature Request
+description: Suggest a feature to be added
+labels: [Feature Request]
+
+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 +1,23 @@
+name: Java CI with Gradle
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    if: ${{ github.event_name != 'pull_request' || github.repository != github.event.pull_request.head.repo.full_name }}
+
+    runs-on: ubuntu-22.04
+
+    steps:
+    - name: Checkout Repository
+      uses: actions/checkout@v4
+    - name: Validate Gradle Wrapper
+      uses: gradle/wrapper-validation-action@v2
+    - name: Set up JDK 17
+      uses: actions/setup-java@v4
+      with:
+        distribution: 'temurin'
+        java-version: 17
+        check-latest: true
+    - name: Build with Gradle
+      run: ./gradlew build

.github/workflows/publish.yml

@@ -0,0 +1,27 @@
+name: Publish to Hangar and Modrinth
+on:
+  push:
+    branches:
+      - master
+      - dev
+
+jobs:
+  publish:
+    if: github.repository_owner == 'ViaVersion'
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout Repository
+        uses: actions/checkout@v4
+      - name: Validate Gradle Wrapper
+        uses: gradle/wrapper-validation-action@v2
+      - name: Set up JDK 17
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'temurin'
+          java-version: 17
+          check-latest: true
+      - name: Publish
+        env:
+          HANGAR_TOKEN: ${{ secrets.HANGAR_TOKEN }}
+          MODRINTH_TOKEN: ${{ secrets.MODRINTH_TOKEN }}
+        run: ./gradlew build modrinth publishAllPublicationsToHangar --stacktrace

.gitignore

@@ -1,105 +1,35 @@
-# Created by .ignore support plugin (hsz.mobi)
-### Maven template
-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
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
+# Ignore project files
+*.iml
 
-# CDT-specific (C/C++ Development Tooling)
-.cproject
+# Ignore IDEA directory
+.idea/*
+!.idea/copyright/*
+!.idea/scopes/*
 
-# JDT-specific (Eclipse Java Development Tools)
-.classpath
+# Include the project's dictionary
+!.idea/dictionaries/
+!.idea/dictionaries/*
 
-# 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/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
-
-# Gradle:
-.idea/gradle.xml
-.idea/libraries
-
-# Mongo Explorer plugin:
-.idea/mongoSettings.xml
-
-## File-based project format:
+# File-based project format:
+*.ipr
 *.iws
 
-## Plugin-specific files:
-
+### Plugin-specific files: ###
 # IntelliJ
 /out/
 
@@ -113,18 +43,67 @@ 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/

.idea/copyright/profiles_settings.xml

@@ -0,0 +1,10 @@
+<component name="CopyrightManager">
+  <settings>
+    <module2copyright>
+      <element module="ViaBackwards" copyright="viabackwards-gpl" />
+    </module2copyright>
+    <LanguageOptions name="__TEMPLATE__">
+      <option name="addBlankAfter" value="false" />
+    </LanguageOptions>
+  </settings>
+</component>

.idea/copyright/viabackwards_gpl.xml

@@ -0,0 +1,6 @@
+<component name="CopyrightManager">
+  <copyright>
+    <option name="notice" value="This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards&#10;Copyright (C) 2016-&amp;#36;today.year ViaVersion and contributors&#10;&#10;This program is free software: you can redistribute it and/or modify&#10;it under the terms of the GNU General Public License as published by&#10;the Free Software Foundation, either version 3 of the License, or&#10;(at your option) any later version.&#10;&#10;This program is distributed in the hope that it will be useful,&#10;but WITHOUT ANY WARRANTY; without even the implied warranty of&#10;MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the&#10;GNU General Public License for more details.&#10;&#10;You should have received a copy of the GNU General Public License&#10;along with this program.  If not, see &lt;http://www.gnu.org/licenses/&gt;." />
+    <option name="myName" value="viabackwards-gpl" />
+  </copyright>
+</component>

.idea/scopes/ViaBackwards.xml

@@ -0,0 +1,3 @@
+<component name="DependencyValidationManager">
+  <scope name="ViaBackwards" pattern="com.viaversion.viabackwards..*" />
+</component>

LICENSE

@@ -1,7 +1,7 @@
                     GNU GENERAL PUBLIC LICENSE
                        Version 3, 29 June 2007
 
- Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ 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.
 
@@ -631,8 +631,8 @@ 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}
+    <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
@@ -645,14 +645,14 @@ the "copyright" line and a pointer to where the full notice is found.
     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/>.
+    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
 notice like this when it starts in an interactive mode:
 
-    {project}  Copyright (C) {year}  {fullname}
+    <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.
@@ -664,11 +664,11 @@ 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
-<http://www.gnu.org/licenses/>.
+<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
-<http://www.gnu.org/philosophy/why-not-lgpl.html>.
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -1,13 +1,63 @@
 # ViaBackwards
 
-Allows 1.9.x on a 1.10 Spigot server.
-Requires [ViaVersion](http://viaversion.com) to be installed
+[![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)
 
-TODO:
-- [ ] Cleanup code
-- [ ] Improve the rewriters
-- [ ] Make it possible to send metadata with the rewriteEntityId
-- [ ] Add support for sound names
-- [ ] Create JavaDocs
-- [ ] Improve the Entity tracker system to work good with multiple versions.
-- [ ] Make it possible to choose your own replacement blocks
+**Allows older Minecraft client versions to connect to newer server versions.**
+
+Requires [ViaVersion](https://hangar.papermc.io/ViaVersion/ViaVersion) to be installed..
+
+Supported Versions
+-
+As a plugin, ViaBackwards runs on servers on releases 1.10-latest. Versions from the dev branch will also support the
+latest snapshot. You can also use ViaBackwards in ViaFabric or ViaFabricPlus.
+
+See [HERE](https://github.com/ViaVersion) for an overview of the different Via* projects.
+
+Releases/Dev Builds
+-
+You can find releases in the following places:
+
+- **Hangar (for our plugins)**: https://hangar.papermc.io/ViaVersion/ViaBackwards
+- **Modrinth (for our mods)**: https://modrinth.com/mod/viabackwards
+- **GitHub**: https://github.com/ViaVersion/ViaBackwards/releases
+
+Dev builds for **all** of our projects are on our Jenkins server:
+
+- **Jenkins**: https://ci.viaversion.com/view/ViaBackwards/
+
+Known issues
+-
+
+* 1.17+ min_y and height world values that are not 0/256 **are not 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))
+* <1.19.4 clients on 1.20+ servers won't be able to use the smithing table, this can be fixed by
+  installing [AxSmithing](https://github.com/ViaVersionAddons/AxSmithing)
+
+Other Links
+-
+**Maven:** https://repo.viaversion.com
+
+**List of contributors:** https://github.com/ViaVersion/ViaBackwards/graphs/contributors
+
+Building
+-
+After cloning this repository, build the project with Gradle by running `./gradlew build` and take the created jar out
+of the `build/libs` directory.
+
+License
+-
+This project is licensed under the [GNU General Public License Version 3](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/).

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("com.github.johnrengelman", "shadow", "8.1.1")
+}

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

@@ -0,0 +1,71 @@
+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 Project.latestCommitMessage(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "log", "-1", "--pretty=%B")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.branchName(): String {
+    val byteOut = ByteArrayOutputStream()
+    exec {
+        commandLine = listOf("git", "rev-parse", "--abbrev-ref", "HEAD")
+        standardOutput = byteOut
+    }
+    return byteOut.toString(Charsets.UTF_8.name()).trim()
+}
+
+fun Project.parseMinecraftSnapshotVersion(version: String): String? {
+    val separatorIndex = version.indexOf('-')
+    val lastSeparatorIndex = version.lastIndexOf('-')
+    if (separatorIndex == -1 || separatorIndex == lastSeparatorIndex) {
+        return null
+    }
+    return version.substring(separatorIndex + 1, lastSeparatorIndex)
+}
+
+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", "META-INF/sponge_plugins.json", "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.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 +1,27 @@
+plugins {
+    base
+    id("vb.build-logic")
+}
+
+allprojects {
+    group = "com.viaversion"
+    version = property("projectVersion") as String // from gradle.properties
+    description = "Allows older Minecraft client versions to connect to newer server versions."
+}
+
+val main = setOf(
+        projects.viabackwards,
+        projects.viabackwardsCommon,
+        projects.viabackwardsBukkit,
+        projects.viabackwardsBungee,
+        projects.viabackwardsFabric,
+        projects.viabackwardsSponge,
+        projects.viabackwardsVelocity
+).map { it.dependencyProject }
+
+subprojects {
+    when (this) {
+        in main -> plugins.apply("vb.shadow-conventions")
+        else -> plugins.apply("vb.standard-conventions")
+    }
+}

bukkit/build.gradle.kts

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

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

@@ -0,0 +1,75 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.viabackwards.listener.PlayerItemDropListener;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.provider.AdvancementCriteriaProvider;
+import com.viaversion.viabackwards.provider.BukkitAdvancementCriteriaProvider;
+import com.viaversion.viaversion.api.Via;
+import com.viaversion.viaversion.api.platform.providers.ViaProviders;
+import com.viaversion.viaversion.api.protocol.version.ProtocolVersion;
+import java.io.File;
+import org.bukkit.plugin.java.JavaPlugin;
+
+public class BukkitPlugin extends JavaPlugin implements ViaBackwardsPlatform {
+
+    public BukkitPlugin() {
+        Via.getManager().addEnableListener(() -> init(new File(getDataFolder(), "config.yml")));
+    }
+
+    @Override
+    public void onEnable() {
+        if (Via.getManager().getInjector().lateProtocolVersionSetting()) {
+            // Enable in the next tick
+            Via.getPlatform().runSync(this::enable, 1);
+        } else {
+            enable();
+        }
+    }
+
+    private void enable() {
+        final ProtocolVersion protocolVersion = Via.getAPI().getServerVersion().highestSupportedProtocolVersion();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_17)) {
+            new PlayerItemDropListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_16)) {
+            new FireExtinguishListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_14)) {
+            new LecternInteractListener(this).register();
+        }
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_12)) {
+            new FireDamageListener(this).register();
+        }
+
+        final ViaProviders providers = Via.getManager().getProviders();
+        if (protocolVersion.newerThanOrEqualTo(ProtocolVersion.v1_20_2)) {
+            providers.use(AdvancementCriteriaProvider.class, new BukkitAdvancementCriteriaProvider());
+        }
+    }
+
+    @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) 2016-2024 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) 2016-2024 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 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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();
+        //noinspection deprecation
+        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/com/viaversion/viabackwards/listener/PlayerItemDropListener.java

@@ -0,0 +1,48 @@
+
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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_13to1_13_1.Protocol1_13To1_13_1;
+import com.viaversion.viaversion.bukkit.listeners.ViaBukkitListener;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.EventPriority;
+import org.bukkit.event.player.PlayerDropItemEvent;
+import org.bukkit.inventory.ItemStack;
+
+public class PlayerItemDropListener extends ViaBukkitListener {
+
+    public PlayerItemDropListener(final BukkitPlugin plugin) {
+        super(plugin, Protocol1_13To1_13_1.class); // Starts with 1.13 clients on 1.17 servers
+    }
+
+    @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
+    public void onItemDrop(final PlayerDropItemEvent event) {
+        final Player player = event.getPlayer();
+        if (!isOnPipe(player)) {
+            return;
+        }
+
+        // Resent the item in the hand
+        final int slot = player.getInventory().getHeldItemSlot();
+        final ItemStack item = player.getInventory().getItem(slot);
+        player.getInventory().setItem(slot, item);
+    }
+}

bukkit/src/main/java/com/viaversion/viabackwards/provider/BukkitAdvancementCriteriaProvider.java

@@ -0,0 +1,34 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.provider;
+
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.provider.AdvancementCriteriaProvider;
+import org.bukkit.Bukkit;
+import org.bukkit.NamespacedKey;
+import org.bukkit.advancement.Advancement;
+
+public final class BukkitAdvancementCriteriaProvider extends AdvancementCriteriaProvider {
+
+    private static final String[] EMPTY_CRITERIA = new String[0];
+
+    @Override
+    public String[] getCriteria(final String key) {
+        final Advancement advancement = Bukkit.getAdvancement(NamespacedKey.fromString(key));
+        return advancement == null ? EMPTY_CRITERIA : advancement.getCriteria().toArray(EMPTY_CRITERIA);
+    }
+}

bukkit/src/main/resources/plugin.yml

@@ -0,0 +1,11 @@
+name: ViaBackwards
+version: ${version}
+description: ${description}
+main: com.viaversion.viabackwards.BukkitPlugin
+api-version: 1.13
+folia-supported: true
+
+authors: [Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1, EnZaXD]
+website: ${url}
+
+depend: [ViaVersion]

bungee/build.gradle.kts

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

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

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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;
+
+import java.io.File;
+
+public class BungeePlugin extends Plugin implements ViaBackwardsPlatform {
+
+    @Override
+    public void onLoad() {
+        Via.getManager().addEnableListener(() -> this.init(new File(getDataFolder(), "config.yml")));
+    }
+
+
+    @Override
+    public void disable() {
+    }
+}

bungee/src/main/resources/bungee.yml

@@ -0,0 +1,5 @@
+name: ViaBackwards
+main: com.viaversion.viabackwards.BungeePlugin
+author: "Matsv, kennytv, Gerrygames, creeper123123321, ForceUpdate1, EnZaXD"
+version: ${version}
+depends: [ViaVersion]

common/build.gradle.kts

@@ -0,0 +1,26 @@
+plugins {
+    id("net.kyori.blossom")
+    id("org.jetbrains.gradle.plugin.idea-ext")
+}
+
+sourceSets {
+    main {
+        blossom {
+            javaSources {
+                property("version", project.version.toString())
+                property("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-templates/com/viaversion/viabackwards/utils/VersionInfo.java

@@ -0,0 +1,32 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2023 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.utils;
+
+public final class VersionInfo {
+
+    public static final String VERSION = "{{ version }}";
+    private static final String IMPLEMENTATION_VERSION = "{{ impl_version }}";
+
+    public static String getVersion() {
+        return VERSION;
+    }
+
+    public static String getImplementationVersion() {
+        return IMPLEMENTATION_VERSION;
+    }
+}

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) 2016-2024 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 final class ViaBackwards {
+
+    private static ViaBackwardsPlatform platform;
+    private static ViaBackwardsConfig config;
+
+    public static void init(ViaBackwardsPlatform platform, ViaBackwardsConfig config) {
+        Preconditions.checkArgument(ViaBackwards.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 +1,104 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.io.InputStream;
+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 reload() {
+        super.reload();
+        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
+    public InputStream getDefaultConfigInputStream() {
+        return getClass().getClassLoader().getResourceAsStream("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 +1,71 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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<CU extends ClientboundPacketType, CM extends ClientboundPacketType, SM extends ServerboundPacketType, SU extends ServerboundPacketType>
+    extends AbstractProtocol<CU, CM, SM, SU> {
+
+    protected BackwardsProtocol() {
+    }
+
+    protected BackwardsProtocol(@Nullable Class<CU> oldClientboundPacketEnum, @Nullable Class<CM> clientboundPacketEnum,
+                                @Nullable Class<SM> oldServerboundPacketEnum, @Nullable Class<SU> 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
+    protected void registerPackets() {
+        super.registerPackets();
+
+        final BackwardsMappings mappingData = getMappingData();
+        if (mappingData != null && mappingData.getViaVersionProtocolClass() != null) {
+            executeAsyncAfterLoaded(mappingData.getViaVersionProtocolClass(), this::loadMappingData);
+        }
+    }
+
+    @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<CU> getTranslatableRewriter() {
+        return null;
+    }
+}

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

@@ -0,0 +1,66 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.viaversion.api.configuration.Config;
+
+public interface ViaBackwardsConfig extends Config {
+
+    /**
+     * 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();
+
+    /**
+     * Converts the 1.13 face look-at packet for 1.12- players. Requires a bit of extra caching.
+     *
+     * @return true if enabled
+     */
+    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();
+
+    /**
+     * Sends inventory acknowledgement packets to act as a replacement for ping packets for sub 1.17 clients.
+     * This only takes effect for ids in the short range. Useful for anticheat compatibility.
+     *
+     * @return true if enabled
+     */
+    boolean handlePingsAsInvAcknowledgements();
+}

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

@@ -0,0 +1,175 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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_18_2to1_19.Protocol1_18_2To1_19;
+import com.viaversion.viabackwards.protocol.protocol1_18to1_18_2.Protocol1_18To1_18_2;
+import com.viaversion.viabackwards.protocol.protocol1_19_1to1_19_3.Protocol1_19_1To1_19_3;
+import com.viaversion.viabackwards.protocol.protocol1_19_3to1_19_4.Protocol1_19_3To1_19_4;
+import com.viaversion.viabackwards.protocol.protocol1_19_4to1_20.Protocol1_19_4To1_20;
+import com.viaversion.viabackwards.protocol.protocol1_19to1_19_1.Protocol1_19To1_19_1;
+import com.viaversion.viabackwards.protocol.protocol1_20_2to1_20_3.Protocol1_20_2To1_20_3;
+import com.viaversion.viabackwards.protocol.protocol1_20_3to1_20_5.Protocol1_20_3To1_20_5;
+import com.viaversion.viabackwards.protocol.protocol1_20to1_20_2.Protocol1_20To1_20_2;
+import com.viaversion.viabackwards.protocol.protocol1_9_1_2to1_9_3_4.Protocol1_9_1_2To1_9_3_4;
+import com.viaversion.viabackwards.protocol.protocol1_9_4to1_10.Protocol1_9_4To1_10;
+import com.viaversion.viabackwards.protocol.protocol1_9to1_9_1.Protocol1_9To1_9_1;
+import com.viaversion.viabackwards.utils.VersionInfo;
+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.Arrays;
+import java.util.logging.Logger;
+
+public interface ViaBackwardsPlatform {
+
+    String MINIMUM_VV_VERSION = "4.10.2";
+
+    /**
+     * Initialize ViaBackwards.
+     */
+    default void init(final File configFile) {
+        ViaBackwardsConfig config = new ViaBackwardsConfig(configFile);
+        config.reload();
+        Via.getManager().getConfigurationProvider().register(config);
+
+        ViaBackwards.init(this, config);
+
+        if (isOutdated()) {
+            disable();
+            return;
+        }
+
+        Via.getManager().getSubPlatforms().add(VersionInfo.getImplementationVersion());
+
+        getLogger().info("Loading translations...");
+        TranslatableRewriter.loadTranslatables();
+
+        getLogger().info("Registering protocols...");
+        final ProtocolManager protocolManager = Via.getManager().getProtocolManager();
+        protocolManager.registerProtocol(new Protocol1_9To1_9_1(), ProtocolVersion.v1_9, ProtocolVersion.v1_9_1);
+        protocolManager.registerProtocol(new Protocol1_9_1_2To1_9_3_4(), Arrays.asList(ProtocolVersion.v1_9_1, ProtocolVersion.v1_9_2), ProtocolVersion.v1_9_3);
+        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);
+        protocolManager.registerProtocol(new Protocol1_18To1_18_2(), ProtocolVersion.v1_18, ProtocolVersion.v1_18_2);
+
+        protocolManager.registerProtocol(new Protocol1_18_2To1_19(), ProtocolVersion.v1_18_2, ProtocolVersion.v1_19);
+        protocolManager.registerProtocol(new Protocol1_19To1_19_1(), ProtocolVersion.v1_19, ProtocolVersion.v1_19_1);
+        protocolManager.registerProtocol(new Protocol1_19_1To1_19_3(), ProtocolVersion.v1_19_1, ProtocolVersion.v1_19_3);
+        protocolManager.registerProtocol(new Protocol1_19_3To1_19_4(), ProtocolVersion.v1_19_3, ProtocolVersion.v1_19_4);
+
+        protocolManager.registerProtocol(new Protocol1_19_4To1_20(), ProtocolVersion.v1_19_4, ProtocolVersion.v1_20);
+        protocolManager.registerProtocol(new Protocol1_20To1_20_2(), ProtocolVersion.v1_20, ProtocolVersion.v1_20_2);
+        protocolManager.registerProtocol(new Protocol1_20_2To1_20_3(), ProtocolVersion.v1_20_2, ProtocolVersion.v1_20_3);
+        protocolManager.registerProtocol(new Protocol1_20_3To1_20_5(), ProtocolVersion.v1_20_3, ProtocolVersion.v1_20_5);
+    }
+
+    /**
+     * 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 (you are running " + vvVersion + ")");
+            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("================================");
+            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/BackwardsMappingDataLoader.java

@@ -0,0 +1,87 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.MappingDataLoader;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import java.io.File;
+import java.io.IOException;
+import java.util.Map;
+import java.util.logging.Logger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsMappingDataLoader extends MappingDataLoader {
+
+    public static final BackwardsMappingDataLoader INSTANCE = new BackwardsMappingDataLoader(BackwardsMappingDataLoader.class, "assets/viabackwards/data/");
+
+    public BackwardsMappingDataLoader(final Class<?> dataLoaderClass, final String dataPath) {
+        super(dataLoaderClass, dataPath);
+    }
+
+    /**
+     * Returns nbt data from the plugin folder or packed assets.
+     * If a file with the same name exists in the plugin folder, the data of the original packed tag will be merged with the file's tag.
+     *
+     * @param name name of the file
+     * @return nbt data from the plugin folder or packed assets
+     */
+    public @Nullable CompoundTag loadNBTFromDir(final String name) {
+        final CompoundTag packedData = loadNBT(name);
+
+        final File file = new File(getDataFolder(), name);
+        if (!file.exists()) {
+            return packedData;
+        }
+
+        getLogger().info("Loading " + name + " from plugin folder");
+        try {
+            final CompoundTag fileData = MAPPINGS_READER.read(file.toPath(), false);
+            return mergeTags(packedData, fileData);
+        } catch (final IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    private CompoundTag mergeTags(final CompoundTag original, final CompoundTag extra) {
+        for (final Map.Entry<String, Tag> entry : extra.entrySet()) {
+            if (entry.getValue() instanceof CompoundTag) {
+                // For compound tags, don't replace the entire tag
+                final CompoundTag originalEntry = original.getCompoundTag(entry.getKey());
+                if (originalEntry != null) {
+                    mergeTags(originalEntry, (CompoundTag) entry.getValue());
+                    continue;
+                }
+            }
+
+            original.put(entry.getKey(), entry.getValue());
+        }
+        return original;
+    }
+
+    @Override
+    public Logger getLogger() {
+        return ViaBackwards.getPlatform().getLogger();
+    }
+
+    @Override
+    public File getDataFolder() {
+        return ViaBackwards.getPlatform().getDataFolder();
+    }
+}

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

@@ -0,0 +1,202 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.BiMappings;
+import com.viaversion.viaversion.api.data.IdentityMappings;
+import com.viaversion.viaversion.api.data.MappingData;
+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.Int2ObjectArrayMap;
+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.NumberTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.util.Key;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsMappings extends MappingDataBase {
+
+    private final Class<? extends Protocol<?, ?, ?, ?>> vvProtocolClass;
+    protected Int2ObjectMap<MappedItem> backwardsItemMappings;
+    private Map<String, String> backwardsSoundMappings;
+    private Map<String, String> entityNames;
+    private Int2ObjectMap<String> enchantmentNames;
+
+    public BackwardsMappings(final String unmappedVersion, final String mappedVersion) {
+        this(unmappedVersion, mappedVersion, null);
+    }
+
+    public BackwardsMappings(final String unmappedVersion, final String mappedVersion, @Nullable final Class<? extends Protocol<?, ?, ?, ?>> vvProtocolClass) {
+        super(unmappedVersion, mappedVersion);
+        Preconditions.checkArgument(vvProtocolClass == null || !vvProtocolClass.isAssignableFrom(BackwardsProtocol.class));
+        this.vvProtocolClass = vvProtocolClass;
+    }
+
+    @Override
+    protected void loadExtras(final CompoundTag data) {
+        final CompoundTag itemNames = data.getCompoundTag("itemnames");
+        if (itemNames != null) {
+            Preconditions.checkNotNull(itemMappings);
+            backwardsItemMappings = new Int2ObjectOpenHashMap<>(itemNames.size());
+
+            final CompoundTag extraItemData = data.getCompoundTag("itemdata");
+            for (final Map.Entry<String, Tag> entry : itemNames.entrySet()) {
+                final StringTag name = (StringTag) entry.getValue();
+                final int id = Integer.parseInt(entry.getKey());
+                Integer customModelData = null;
+                if (extraItemData != null && extraItemData.contains(entry.getKey())) {
+                    final CompoundTag entryTag = extraItemData.getCompoundTag(entry.getKey());
+                    final NumberTag customModelDataTag = entryTag.getNumberTag("custom_model_data");
+                    customModelData = customModelDataTag != null ? customModelDataTag.asInt() : null;
+                }
+
+                backwardsItemMappings.put(id, new MappedItem(getNewItemId(id), name.getValue(), customModelData));
+            }
+        }
+
+        this.entityNames = loadNameByStringMappings(data, "entitynames");
+        this.enchantmentNames = loadNameByIdMappings(data, "enchantmentnames");
+        this.backwardsSoundMappings = loadNameByStringMappings(data, "soundnames");
+    }
+
+    private @Nullable Map<String, String> loadNameByStringMappings(final CompoundTag data, final String key) {
+        final CompoundTag nameMappings = data.getCompoundTag(key);
+        if (nameMappings == null) {
+            return null;
+        }
+
+        final Map<String, String> map = new HashMap<>(nameMappings.size());
+        for (final Map.Entry<String, Tag> entry : nameMappings.entrySet()) {
+            final StringTag mappedTag = (StringTag) entry.getValue();
+            map.put(entry.getKey(), mappedTag.getValue());
+        }
+        return map;
+    }
+
+    private @Nullable Int2ObjectMap<String> loadNameByIdMappings(final CompoundTag data, final String key) {
+        final CompoundTag nameMappings = data.getCompoundTag(key);
+        if (nameMappings == null) {
+            return null;
+        }
+
+        final Int2ObjectMap<String> map = new Int2ObjectArrayMap<>(nameMappings.size());
+        for (final Map.Entry<String, Tag> entry : nameMappings.entrySet()) {
+            final StringTag mappedTag = (StringTag) entry.getValue();
+            map.put(Integer.parseInt(entry.getKey()), mappedTag.getValue());
+        }
+        return map;
+    }
+
+    @Override
+    protected @Nullable BiMappings loadBiMappings(final CompoundTag data, final String key) {
+        if (key.equals("items") && vvProtocolClass != null) {
+            Mappings mappings = super.loadMappings(data, key);
+            final MappingData mappingData = Via.getManager().getProtocolManager().getProtocol(vvProtocolClass).getMappingData();
+            if (mappingData != null && mappingData.getItemMappings() != null) {
+                final BiMappings vvItemMappings = mappingData.getItemMappings();
+                if (mappings == null) {
+                    mappings = new IdentityMappings(vvItemMappings.mappedSize(), vvItemMappings.size());
+                }
+                return ItemMappings.of(mappings, vvItemMappings);
+            }
+        }
+        return super.loadBiMappings(data, key);
+    }
+
+    /**
+     * @see #getMappedItem(int) for custom backwards mappings
+     */
+    @Override
+    public int getNewItemId(final int id) {
+        // Don't warn on missing here
+        return this.itemMappings.getNewId(id);
+    }
+
+    @Override
+    public int getNewBlockId(final 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().getNewId(id), "item");
+    }
+
+    public @Nullable MappedItem getMappedItem(final int id) {
+        return backwardsItemMappings != null ? backwardsItemMappings.get(id) : null;
+    }
+
+    public @Nullable String getMappedNamedSound(final String id) {
+        if (backwardsSoundMappings == null) {
+            return null;
+        }
+        return backwardsSoundMappings.get(Key.stripMinecraftNamespace(id));
+    }
+
+    public @Nullable String mappedEntityName(final String entityName) {
+        if (entityNames == null) {
+            getLogger().log(Level.SEVERE, "No entity mappings found when requesting them for " + entityName, new RuntimeException());
+            return null;
+        }
+        return entityNames.get(entityName);
+    }
+
+    public @Nullable String mappedEnchantmentName(final int enchantmentId) {
+        if (enchantmentNames == null) {
+            ViaBackwards.getPlatform().getLogger().log(Level.SEVERE, "No enchantment name mappings found when requesting " + enchantmentId, new RuntimeException());
+            return null;
+        }
+        return enchantmentNames.get(enchantmentId);
+    }
+
+    public @Nullable Int2ObjectMap<MappedItem> getBackwardsItemMappings() {
+        return backwardsItemMappings;
+    }
+
+    public @Nullable Map<String, String> getBackwardsSoundMappings() {
+        return backwardsSoundMappings;
+    }
+
+    public @Nullable Class<? extends Protocol<?, ?, ?, ?>> getViaVersionProtocolClass() {
+        return vvProtocolClass;
+    }
+
+    @Override
+    protected Logger getLogger() {
+        return ViaBackwards.getPlatform().getLogger();
+    }
+
+    @Override
+    protected @Nullable CompoundTag readMappingsFile(final String name) {
+        return BackwardsMappingDataLoader.INSTANCE.loadNBTFromDir(name);
+    }
+}

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

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.BiMappingsBase;
+import com.viaversion.viaversion.api.data.Mappings;
+
+public final class ItemMappings extends BiMappingsBase {
+
+    private ItemMappings(final Mappings mappings, final Mappings inverse) {
+        super(mappings, inverse);
+    }
+
+    public static ItemMappings of(final Mappings mappings, final Mappings inverse) {
+        return new ItemMappings(mappings, inverse);
+    }
+
+    @Override
+    public void setNewId(final int id, final int mappedId) {
+        // Only set one-way
+        mappings.setNewId(id, mappedId);
+    }
+}

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

@@ -0,0 +1,57 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class MappedItem {
+
+    private final int id;
+    private final String jsonName;
+    private final Tag tagName;
+    private final Integer customModelData;
+
+    public MappedItem(final int id, final String name) {
+        this(id, name, null);
+    }
+
+    public MappedItem(final int id, final String name, @Nullable final Integer customModelData) {
+        this.id = id;
+        this.jsonName = ComponentUtil.legacyToJsonString("§f" + name, true);
+        this.tagName = ComponentUtil.jsonStringToTag(jsonName);
+        this.customModelData = customModelData;
+    }
+
+    public int id() {
+        return id;
+    }
+
+    public String jsonName() {
+        return jsonName;
+    }
+
+    public Tag tagName() {
+        return tagName;
+    }
+
+    public @Nullable Integer customModelData() {
+        return customModelData;
+    }
+}

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

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.util.IdAndData;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class MappedLegacyBlockItem {
+
+    private final int id;
+    private final short data;
+    private final String name;
+    private final IdAndData block;
+    private BlockEntityHandler blockEntityHandler;
+
+    public MappedLegacyBlockItem(int id) {
+        this(id, (short) -1, null, Type.ITEM);
+    }
+
+    public MappedLegacyBlockItem(int id, short data, @Nullable String name, Type type) {
+        this.id = id;
+        this.data = data;
+        this.name = name != null ? "§f" + name : null;
+        this.block = type != Type.ITEM ? data != -1 ? new IdAndData(id, data) : new IdAndData(id) : null;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public short getData() {
+        return data;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public IdAndData 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);
+    }
+
+    public enum Type {
+
+        ITEM("items"),
+        BLOCK_ITEM("block-items"),
+        BLOCK("blocks");
+
+        final String name;
+
+        Type(final String name) {
+            this.name = name;
+        }
+
+        public String getName() {
+            return name;
+        }
+    }
+}

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

@@ -0,0 +1,134 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.Locale;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class EntityData {
+    private final BackwardsProtocol<?, ?, ?, ?> protocol;
+    private final int id;
+    private final int replacementId;
+    private final String key;
+    private ComponentType componentType = ComponentType.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.componentType = ComponentType.JSON;
+        return this;
+    }
+
+    public EntityData tagName() {
+        this.componentType = ComponentType.TAG;
+        return this;
+    }
+
+    public EntityData plainName() {
+        this.componentType = ComponentType.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 entityName() {
+        if (componentType == ComponentType.NONE) {
+            return null;
+        }
+
+        final String name = protocol.getMappingData().mappedEntityName(key);
+        if (name == null) {
+            return null;
+        }
+
+        if (componentType == ComponentType.JSON) {
+            return ComponentUtil.legacyToJson(name);
+        } else if (componentType == ComponentType.TAG) {
+            return new StringTag(name);
+        }
+        return 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 ComponentType {
+        PLAIN,
+        JSON,
+        TAG,
+        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) 2016-2024 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 +1,119 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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) 2016-2024 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) 2016-2024 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 +1,65 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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 java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+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/rewriters/BackwardsItemRewriter.java

@@ -0,0 +1,215 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+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.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends BackwardsItemRewriterBase<C, S, T> {
+
+    public BackwardsItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        super(protocol, itemType, itemArrayType, true);
+    }
+
+    public BackwardsItemRewriter(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType, true);
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, @Nullable Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        CompoundTag display = item.tag() != null ? item.tag().getCompoundTag("display") : null;
+        if (protocol.getTranslatableRewriter() != null && display != null) {
+            // Handle name and lore components
+            StringTag name = display.getStringTag("Name");
+            if (name != null) {
+                String newValue = protocol.getTranslatableRewriter().processText(connection, name.getValue()).toString();
+                if (!newValue.equals(name.getValue())) {
+                    saveStringTag(display, name, "Name");
+                }
+
+                name.setValue(newValue);
+            }
+
+            ListTag<StringTag> lore = display.getListTag("Lore", StringTag.class);
+            if (lore != null) {
+                boolean changed = false;
+                for (StringTag loreEntry : lore) {
+                    String newValue = protocol.getTranslatableRewriter().processText(connection, 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() != null ? protocol.getMappingData().getMappedItem(item.identifier()) : null;
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(connection, item);
+        }
+
+        if (item.tag() == null) {
+            item.setTag(new CompoundTag());
+        }
+
+        // Save original id, set remapped id
+        item.tag().putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(data.id());
+
+        // Add custom model data
+        if (data.customModelData() != null && !item.tag().contains("CustomModelData")) {
+            item.tag().putInt("CustomModelData", data.customModelData());
+        }
+
+        // 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.jsonName()));
+            display.put(nbtTagName("customName"), new ByteTag());
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+
+        super.handleItemToServer(connection, item);
+        if (item.tag() != null) {
+            Tag originalId = item.tag().remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+        }
+        return item;
+    }
+
+    @Override
+    public void registerAdvancements(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(wrapper -> {
+                    wrapper.passthrough(Type.BOOLEAN); // Reset/clear
+                    final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
+                    for (int i = 0; i < size; i++) {
+                        wrapper.passthrough(Type.STRING); // Identifier
+                        wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
+
+                        // Display data
+                        if (wrapper.passthrough(Type.BOOLEAN)) {
+                            final JsonElement title = wrapper.passthrough(Type.COMPONENT);
+                            final JsonElement description = wrapper.passthrough(Type.COMPONENT);
+                            final TranslatableRewriter<C> translatableRewriter = protocol.getTranslatableRewriter();
+                            if (translatableRewriter != null) {
+                                translatableRewriter.processText(wrapper.user(), title);
+                                translatableRewriter.processText(wrapper.user(), description);
+                            }
+
+                            final Item icon = handleItemToClient(wrapper.user(), wrapper.read(itemType()));
+                            wrapper.write(mappedItemType(), icon);
+
+                            wrapper.passthrough(Type.VAR_INT); // Frame type
+                            int flags = wrapper.passthrough(Type.INT); // Flags
+                            if ((flags & 1) != 0) {
+                                wrapper.passthrough(Type.STRING); // Background texture
+                            }
+                            wrapper.passthrough(Type.FLOAT); // X
+                            wrapper.passthrough(Type.FLOAT); // Y
+                        }
+
+                        wrapper.passthrough(Type.STRING_ARRAY); // Criteria
+
+                        final int arrayLength = wrapper.passthrough(Type.VAR_INT);
+                        for (int array = 0; array < arrayLength; array++) {
+                            wrapper.passthrough(Type.STRING_ARRAY); // String array
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public void registerAdvancements1_20_3(final C packetType) {
+        // Insert translatable rewriter
+        protocol.registerClientbound(packetType, wrapper -> {
+            wrapper.passthrough(Type.BOOLEAN); // Reset/clear
+            final int size = wrapper.passthrough(Type.VAR_INT); // Mapping size
+            for (int i = 0; i < size; i++) {
+                wrapper.passthrough(Type.STRING); // Identifier
+                wrapper.passthrough(Type.OPTIONAL_STRING); // Parent
+
+                // Display data
+                if (wrapper.passthrough(Type.BOOLEAN)) {
+                    final Tag title = wrapper.passthrough(Type.TAG);
+                    final Tag description = wrapper.passthrough(Type.TAG);
+                    final TranslatableRewriter<C> translatableRewriter = protocol.getTranslatableRewriter();
+                    if (translatableRewriter != null) {
+                        translatableRewriter.processTag(wrapper.user(), title);
+                        translatableRewriter.processTag(wrapper.user(), description);
+                    }
+
+                    final Item icon = handleItemToClient(wrapper.user(), wrapper.read(itemType()));
+                    wrapper.write(mappedItemType(), icon);
+
+                    wrapper.passthrough(Type.VAR_INT); // Frame type
+                    final int flags = wrapper.passthrough(Type.INT);
+                    if ((flags & 1) != 0) {
+                        wrapper.passthrough(Type.STRING); // Background texture
+                    }
+                    wrapper.passthrough(Type.FLOAT); // X
+                    wrapper.passthrough(Type.FLOAT); // Y
+                }
+
+                final int requirements = wrapper.passthrough(Type.VAR_INT);
+                for (int array = 0; array < requirements; array++) {
+                    wrapper.passthrough(Type.STRING_ARRAY);
+                }
+
+                wrapper.passthrough(Type.BOOLEAN); // Send telemetry
+            }
+        });
+    }
+}

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

@@ -0,0 +1,147 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+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.rewriter.ItemRewriter;
+import java.util.ArrayList;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class BackwardsItemRewriterBase<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends ItemRewriter<C, S, T> {
+
+    protected final boolean jsonNameFormat;
+
+    protected BackwardsItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType, boolean jsonFormat) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType);
+        this.jsonNameFormat = jsonFormat;
+    }
+
+    protected BackwardsItemRewriterBase(T protocol, Type<Item> itemType, Type<Item[]> itemArrayType, boolean jsonNameFormat) {
+        this(protocol, itemType, itemArrayType, itemType, itemArrayType, jsonNameFormat);
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        restoreDisplayTag(item);
+        return item;
+    }
+
+    protected boolean hasBackupTag(CompoundTag tag, String tagName) {
+        return tag.contains(nbtTagName(tagName));
+    }
+
+    protected void saveStringTag(CompoundTag tag, StringTag original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            tag.putString(backupName, original.getValue());
+        }
+    }
+
+    protected void saveListTag(CompoundTag tag, ListTag<?> original, String name) {
+        // Multiple places might try to backup data
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            tag.put(backupName, original.copy());
+        }
+    }
+
+    protected void saveGenericTagList(CompoundTag tag, List<Tag> original, String name) {
+        // List tags cannot contain tags of different types, so we have to store them a bit more awkwardly as an indexed compound tag
+        String backupName = nbtTagName(name);
+        if (!tag.contains(backupName)) {
+            CompoundTag output = new CompoundTag();
+            for (int i = 0; i < original.size(); i++) {
+                output.put(Integer.toString(i), original.get(i));
+            }
+            tag.put(backupName, output);
+        }
+    }
+
+    protected List<Tag> removeGenericTagList(CompoundTag tag, String name) {
+        String backupName = nbtTagName(name);
+        CompoundTag data = tag.getCompoundTag(backupName);
+        if (data == null) {
+            return null;
+        }
+
+        tag.remove(backupName);
+        return new ArrayList<>(data.values());
+    }
+
+    protected void restoreDisplayTag(Item item) {
+        if (item.tag() == null) return;
+
+        CompoundTag display = item.tag().getCompoundTag("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) {
+        Tag original = tag.remove(nbtTagName(tagName));
+        if (original instanceof StringTag) {
+            tag.putString(tagName, ((StringTag) original).getValue());
+        }
+    }
+
+    protected void restoreListTag(CompoundTag tag, String tagName) {
+        Tag original = tag.remove(nbtTagName(tagName));
+        if (original instanceof ListTag) {
+            tag.put(tagName, ((ListTag<?>) original).copy());
+        }
+    }
+
+    public <T extends Tag> @Nullable ListTag<T> removeListTag(CompoundTag tag, String tagName, Class<T> tagType) {
+        String backupName = nbtTagName(tagName);
+        ListTag<T> data = tag.getListTag(backupName, tagType);
+        if (data == null) {
+            return null;
+        }
+
+        tag.remove(backupName);
+        return data;
+    }
+
+    @Override
+    public String nbtTagName() {
+        return "VB|" + protocol.getClass().getSimpleName();
+    }
+}

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

@@ -0,0 +1,186 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.BackwardsMappings;
+import com.viaversion.viabackwards.api.data.MappedItem;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.type.Type;
+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.Tag;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BackwardsStructuredItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends BackwardsItemRewriter<C, S, T> {
+
+    protected final StructuredEnchantmentRewriter enchantmentRewriter = new StructuredEnchantmentRewriter(this);
+
+    public BackwardsStructuredItemRewriter(final T protocol, final Type<Item> itemType, final Type<Item[]> itemArrayType) {
+        super(protocol, itemType, itemArrayType);
+    }
+
+    public BackwardsStructuredItemRewriter(final T protocol, final Type<Item> itemType, final Type<Item[]> itemArrayType, final Type<Item> mappedItemType, final Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType);
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(final UserConnection connection, @Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        final StructuredDataContainer data = item.structuredData();
+        data.setIdLookup(protocol, true);
+
+        if (protocol.getMappingData().getEnchantmentMappings() != null) {
+            enchantmentRewriter.handleToClient(item);
+        }
+
+        if (protocol.getTranslatableRewriter() != null) {
+            // Handle name and lore components
+            final StructuredData<Tag> customNameData = data.getNonEmpty(StructuredDataKey.CUSTOM_NAME);
+            if (customNameData != null) {
+                final Tag originalName = customNameData.value().copy();
+                protocol.getTranslatableRewriter().processTag(connection, customNameData.value());
+                if (!customNameData.value().equals(originalName)) {
+                    saveTag(createCustomTag(item), originalName, "Name");
+                }
+            }
+
+            final StructuredData<Tag[]> loreData = data.getNonEmpty(StructuredDataKey.LORE);
+            if (loreData != null) {
+                for (final Tag tag : loreData.value()) {
+                    protocol.getTranslatableRewriter().processTag(connection, tag);
+                }
+            }
+        }
+
+        final BackwardsMappings mappingData = protocol.getMappingData();
+        final MappedItem mappedItem = mappingData != null ? mappingData.getMappedItem(item.identifier()) : null;
+        if (mappedItem == null) {
+            // Just rewrite the id
+            if (mappingData != null && mappingData.getItemMappings() != null) {
+                item.setIdentifier(mappingData.getNewItemId(item.identifier()));
+            }
+            return item;
+        }
+
+        // Save original id, set remapped id
+        final CompoundTag tag = createCustomTag(item);
+        tag.putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(mappedItem.id());
+
+        // Add custom model data
+        if (mappedItem.customModelData() != null && !data.contains(StructuredDataKey.CUSTOM_MODEL_DATA)) {
+            data.set(StructuredDataKey.CUSTOM_MODEL_DATA, mappedItem.customModelData());
+        }
+
+        // Set custom name - only done if there is no original one
+        if (!data.contains(StructuredDataKey.CUSTOM_NAME)) {
+            data.set(StructuredDataKey.CUSTOM_NAME, mappedItem.tagName());
+            tag.putBoolean(nbtTagName("customName"), true);
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(final UserConnection connection, @Nullable final Item item) {
+        if (item == null) {
+            return null;
+        }
+
+        final BackwardsMappings mappingData = protocol.getMappingData();
+        if (mappingData != null && mappingData.getItemMappings() != null) {
+            item.setIdentifier(mappingData.getOldItemId(item.identifier()));
+        }
+
+        final StructuredDataContainer data = item.structuredData();
+        data.setIdLookup(protocol, false);
+
+        if (protocol.getMappingData().getEnchantmentMappings() != null) {
+            enchantmentRewriter.handleToServer(item);
+        }
+
+        final CompoundTag tag = customTag(item);
+        if (tag != null) {
+            final Tag originalId = tag.remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+        }
+
+        restoreDisplayTag(item);
+        return item;
+    }
+
+    protected @Nullable CompoundTag customTag(final Item item) {
+        final StructuredData<CompoundTag> customData = item.structuredData().getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        return customData != null ? customData.value() : null;
+    }
+
+    protected CompoundTag createCustomTag(final Item item) {
+        final StructuredDataContainer data = item.structuredData();
+        final StructuredData<CompoundTag> customData = data.getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        if (customData != null) {
+            return customData.value();
+        }
+
+        final CompoundTag tag = new CompoundTag();
+        data.set(StructuredDataKey.CUSTOM_DATA, tag);
+        return tag;
+    }
+
+    @Override
+    protected void restoreDisplayTag(final Item item) {
+        final StructuredDataContainer data = item.structuredData();
+        final StructuredData<CompoundTag> customData = data.getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        if (customData == null) {
+            return;
+        }
+
+        // Remove custom name
+        if (customData.value().remove(nbtTagName("customName")) != null) {
+            data.remove(StructuredDataKey.CUSTOM_NAME);
+        } else {
+            final Tag name = removeBackupTag(customData.value(), "Name");
+            if (name != null) {
+                data.set(StructuredDataKey.CUSTOM_NAME, name);
+            }
+        }
+    }
+
+    protected void saveTag(CompoundTag customData, Tag tag, String name) {
+        String backupName = nbtTagName(name);
+        if (!customData.contains(backupName)) {
+            customData.put(backupName, tag);
+        }
+    }
+
+    protected @Nullable Tag removeBackupTag(CompoundTag customData, String tagName) {
+        return customData.remove(nbtTagName(tagName));
+    }
+}

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

@@ -0,0 +1,174 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.StringTag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import com.viaversion.viaversion.util.Key;
+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 {
+
+    protected final Map<String, String> enchantmentMappings = new HashMap<>();
+    protected final BackwardsItemRewriter<?, ?, ?> itemRewriter;
+    private final boolean jsonFormat;
+
+    public EnchantmentRewriter(BackwardsItemRewriter<?, ?, ?> itemRewriter, boolean jsonFormat) {
+        this.itemRewriter = itemRewriter;
+        this.jsonFormat = jsonFormat;
+    }
+
+    public EnchantmentRewriter(BackwardsItemRewriter<?, ?, ?> itemRewriter) {
+        this(itemRewriter, true);
+    }
+
+    public void registerEnchantment(String key, String replacementLore) {
+        enchantmentMappings.put(Key.stripMinecraftNamespace(key), replacementLore);
+    }
+
+    public void handleToClient(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.getListTag("Enchantments") != null) {
+            rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.getListTag("StoredEnchantments") != null) {
+            rewriteEnchantmentsToClient(tag, true);
+        }
+    }
+
+    public void handleToServer(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.contains(itemRewriter.nbtTagName("Enchantments"))) {
+            rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(itemRewriter.nbtTagName("StoredEnchantments"))) {
+            rewriteEnchantmentsToServer(tag, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "Enchantments";
+        ListTag<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        List<StringTag> loreToAdd = new ArrayList<>();
+        boolean changed = false;
+
+        Iterator<CompoundTag> iterator = enchantments.iterator();
+        while (iterator.hasNext()) {
+            CompoundTag enchantmentEntry = iterator.next();
+            StringTag idTag = enchantmentEntry.getStringTag("id");
+            if (idTag == null) {
+                continue;
+            }
+
+            String enchantmentId = Key.stripMinecraftNamespace(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();
+
+                NumberTag levelTag = enchantmentEntry.getNumberTag("lvl");
+                int level = levelTag != null ? levelTag.asInt() : 1;
+                String loreValue = remappedName + " " + getRomanNumber(level);
+                if (jsonFormat) {
+                    loreValue = ComponentUtil.legacyToJsonString(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.isEmpty()) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.putString("id", "");
+                dummyEnchantment.putShort("lvl", (short) 0);
+                enchantments.add(dummyEnchantment);
+            }
+
+            CompoundTag display = tag.getCompoundTag("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+
+            ListTag<StringTag> loreTag = display.getListTag("Lore", StringTag.class);
+            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 +1,153 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.entity.EntityTracker;
+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.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_14;
+
+public abstract class EntityRewriter<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriterBase<C, 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(C packetType, EntityType fallingBlockType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                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));
+            }
+        });
+    }
+
+    @Override
+    public void registerTrackerWithData1_19(C packetType, EntityType fallingBlockType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // Entity id
+                map(Type.UUID); // Entity UUID
+                map(Type.VAR_INT); // Entity type
+                map(Type.DOUBLE); // X
+                map(Type.DOUBLE); // Y
+                map(Type.DOUBLE); // Z
+                map(Type.BYTE); // Pitch
+                map(Type.BYTE); // Yaw
+                map(Type.BYTE); // Head yaw
+                map(Type.VAR_INT); // Data
+                handler(getSpawnTrackerWithDataHandler1_19(fallingBlockType));
+            }
+        });
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler(EntityType fallingBlockType) {
+        return wrapper -> {
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == fallingBlockType) {
+                int blockState = wrapper.get(Type.INT, 0);
+                wrapper.set(Type.INT, 0, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public PacketHandler getSpawnTrackerWithDataHandler1_19(EntityType fallingBlockType) {
+        return wrapper -> {
+            if (protocol.getMappingData() == null) {
+                return;
+            }
+
+            // Check against the UNMAPPED entity type
+            EntityType entityType = trackAndMapEntity(wrapper);
+            if (entityType == fallingBlockType) {
+                int blockState = wrapper.get(Type.VAR_INT, 2);
+                wrapper.set(Type.VAR_INT, 2, protocol.getMappingData().getNewBlockStateId(blockState));
+            }
+        };
+    }
+
+    public void registerSpawnTracker(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // 0 - Entity ID
+                map(Type.UUID); // 1 - Entity UUID
+                map(Type.VAR_INT); // 2 - Entity Type
+                handler(wrapper -> trackAndMapEntity(wrapper));
+            }
+        });
+    }
+
+    /**
+     * Returns a handler to track the current world and uncache entity data on world changes.
+     *
+     * @return handler to track the current world
+     */
+    public PacketHandler worldTrackerHandlerByKey() {
+        return wrapper -> {
+            EntityTracker tracker = tracker(wrapper.user());
+            String world = wrapper.get(Type.STRING, 1);
+            if (tracker.currentWorld() != null && !tracker.currentWorld().equals(world)) {
+                tracker.clearEntities();
+                tracker.trackClientEntity();
+            }
+            tracker.setCurrentWorld(world);
+        };
+    }
+
+    /**
+     * Sets the mapped entity id and returns the unmapped entity type.
+     *
+     * @param wrapper packet wrapper
+     * @return unmapped (!) entity type
+     */
+    protected EntityType trackAndMapEntity(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 +1,251 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.entity.TrackedEntity;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.Particle;
+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.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.type.Type;
+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.rewriter.EntityRewriter;
+import com.viaversion.viaversion.rewriter.meta.MetaHandlerEvent;
+import java.util.List;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+/**
+ * Entity rewriter base class.
+ *
+ * @see com.viaversion.viabackwards.api.rewriters.EntityRewriter
+ * @see LegacyEntityRewriter
+ */
+public abstract class EntityRewriterBase<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriter<C, 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) {
+        final TrackedEntity entity = tracker(connection).entity(entityId);
+        final boolean initialMetadata = !(entity != null && entity.hasSentMetadata());
+
+        super.handleMetadata(entityId, metadataList, connection);
+
+        if (entity == null) {
+            return; // Don't handle untracked entities - basically always the fault of a plugin sending virtual entities through concurrency-unsafe handling
+        }
+
+        // Set the mapped entity name if there is no custom name set already
+        final EntityData entityData = entityDataForType(entity.entityType());
+        final Object displayNameObject;
+        if (entityData != null && (displayNameObject = entityData.entityName()) != null) {
+            final Metadata displayName = getMeta(displayNameIndex, metadataList);
+            if (initialMetadata) {
+                if (displayName == null) {
+                    // Add it as new metadata
+                    metadataList.add(new Metadata(displayNameIndex, displayNameMetaType, displayNameObject));
+                    addDisplayVisibilityMeta(metadataList);
+                } else if (displayName.getValue() == null || displayName.getValue().toString().isEmpty()) {
+                    // Overwrite the existing null/empty display name
+                    displayName.setValue(displayNameObject);
+                    addDisplayVisibilityMeta(metadataList);
+                }
+            } else if (displayName != null && (displayName.getValue() == null || displayName.getValue().toString().isEmpty())) {
+                // Overwrite null/empty display name
+                displayName.setValue(displayNameObject);
+                addDisplayVisibilityMeta(metadataList);
+            }
+        }
+
+        // Add any other extra meta for mapped entities
+        if (entityData != null && entityData.hasBaseMeta() && initialMetadata) {
+            entityData.defaultMeta().createMeta(new WrappedMetadata(metadataList));
+        }
+    }
+
+    private void addDisplayVisibilityMeta(List<Metadata> metadataList) {
+        if (alwaysShowOriginalMobName()) {
+            removeMeta(displayVisibilityIndex, metadataList);
+            metadataList.add(new Metadata(displayVisibilityIndex, displayVisibilityMetaType, getDisplayVisibilityMetaValue()));
+        }
+    }
+
+    protected Object getDisplayVisibilityMetaValue() {
+        return true;
+    }
+
+    protected boolean alwaysShowOriginalMobName() {
+        return ViaBackwards.getConfig().alwaysShowOriginalMobName();
+    }
+
+    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(), "Both entity types need to be of the same class");
+
+        // 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;
+    }
+
+    public void registerMetaTypeHandler(
+        @Nullable MetaType itemType,
+        @Nullable MetaType blockStateType,
+        @Nullable MetaType optionalBlockStateType,
+        @Nullable MetaType particleType,
+        @Nullable MetaType componentType,
+        @Nullable MetaType optionalComponentType
+    ) {
+        filter().handler((event, meta) -> {
+            MetaType type = meta.metaType();
+            if (type == itemType) {
+                protocol.getItemRewriter().handleItemToClient(event.user(), meta.value());
+            } else if (type == blockStateType) {
+                int data = meta.value();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (type == optionalBlockStateType) {
+                int data = meta.value();
+                if (data != 0) {
+                    meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+                }
+            } else if (type == particleType) {
+                rewriteParticle(event.user(), meta.value());
+            } else if (type == optionalComponentType || type == componentType) {
+                JsonElement text = meta.value();
+                protocol.getTranslatableRewriter().processText(event.user(), text);
+            }
+        });
+    }
+
+    public void registerMetaTypeHandler1_20_3(
+        @Nullable MetaType itemType,
+        @Nullable MetaType blockStateType,
+        @Nullable MetaType optionalBlockStateType,
+        @Nullable MetaType particleType,
+        @Nullable MetaType particlesType,
+        @Nullable MetaType componentType,
+        @Nullable MetaType optionalComponentType
+    ) {
+        filter().handler((event, meta) -> {
+            MetaType type = meta.metaType();
+            if (type == itemType) {
+                meta.setValue(protocol.getItemRewriter().handleItemToClient(event.user(), meta.value()));
+            } else if (type == blockStateType) {
+                int data = meta.value();
+                meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+            } else if (type == optionalBlockStateType) {
+                int data = meta.value();
+                if (data != 0) {
+                    meta.setValue(protocol.getMappingData().getNewBlockStateId(data));
+                }
+            } else if (type == particleType) {
+                rewriteParticle(event.user(), meta.value());
+            } else if (type == particlesType) {
+                Particle[] particles = meta.value();
+                for (final Particle particle : particles) {
+                    rewriteParticle(event.user(), particle);
+                }
+            } else if (type == optionalComponentType || type == componentType) {
+                protocol.getTranslatableRewriter().processTag(event.user(), meta.value());
+            }
+        });
+    }
+
+    // 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/LegacyBlockItemRewriter.java

@@ -0,0 +1,429 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.BackwardsMappingDataLoader;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.data.BlockColors;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
+import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
+import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+import com.viaversion.viaversion.api.protocol.packet.ServerboundPacketType;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandler;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+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.ShortTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Optional;
+import com.viaversion.viaversion.util.IdAndData;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class LegacyBlockItemRewriter<C extends ClientboundPacketType, S extends ServerboundPacketType,
+    T extends BackwardsProtocol<C, ?, ?, S>> extends BackwardsItemRewriterBase<C, S, T> {
+
+    protected final Int2ObjectMap<MappedLegacyBlockItem> itemReplacements = new Int2ObjectOpenHashMap<>(8); // Raw id -> mapped data
+    protected final Int2ObjectMap<MappedLegacyBlockItem> blockReplacements = new Int2ObjectOpenHashMap<>(8); // Raw id -> mapped data
+
+    protected LegacyBlockItemRewriter(T protocol, String name, Type<Item> itemType, Type<Item[]> itemArrayType, Type<Item> mappedItemType, Type<Item[]> mappedItemArrayType) {
+        super(protocol, itemType, itemArrayType, mappedItemType, mappedItemArrayType, false);
+
+        Int2ObjectMap<MappedLegacyBlockItem> blockItemReplacements = new Int2ObjectOpenHashMap<>(8);
+        final JsonObject jsonObject = readMappingsFile("item-mappings-" + name + ".json");
+        addMappings(MappedLegacyBlockItem.Type.ITEM, jsonObject, itemReplacements);
+        addMappings(MappedLegacyBlockItem.Type.BLOCK_ITEM, jsonObject, blockItemReplacements);
+        addMappings(MappedLegacyBlockItem.Type.BLOCK, jsonObject, blockReplacements);
+
+        blockReplacements.putAll(blockItemReplacements);
+        itemReplacements.putAll(blockItemReplacements);
+    }
+
+    protected LegacyBlockItemRewriter(T protocol, String name, Type<Item> itemType, Type<Item[]> itemArrayType) {
+        this(protocol, name, itemType, itemArrayType, itemType, itemArrayType);
+    }
+
+    protected LegacyBlockItemRewriter(T protocol, String name) {
+        this(protocol, name, Type.ITEM1_8, Type.ITEM1_8_SHORT_ARRAY);
+    }
+
+    private void addMappings(MappedLegacyBlockItem.Type type, JsonObject object, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
+        if (object.has(type.getName())) {
+            final JsonObject mappingsObject = object.getAsJsonObject(type.getName());
+            for (Map.Entry<String, JsonElement> dataEntry : mappingsObject.entrySet()) {
+                addMapping(dataEntry.getKey(), dataEntry.getValue().getAsJsonObject(), type, mappings);
+            }
+        }
+    }
+
+    private void addMapping(String key, JsonObject object, MappedLegacyBlockItem.Type type, Int2ObjectMap<MappedLegacyBlockItem> mappings) {
+        int id = object.getAsJsonPrimitive("id").getAsInt();
+        JsonPrimitive jsonData = object.getAsJsonPrimitive("data");
+        short data = jsonData != null ? jsonData.getAsShort() : 0;
+        String name = type != MappedLegacyBlockItem.Type.BLOCK ? object.getAsJsonPrimitive("name").getAsString() : null;
+
+        if (key.indexOf('-') == -1) {
+            int unmappedId;
+            int dataSeparatorIndex = key.indexOf(':');
+            if (dataSeparatorIndex != -1) {
+                // Include data
+                short unmappedData = Short.parseShort(key.substring(dataSeparatorIndex + 1));
+                unmappedId = Integer.parseInt(key.substring(0, dataSeparatorIndex));
+                unmappedId = IdAndData.toRawData(unmappedId, unmappedData);
+            } else {
+                unmappedId = IdAndData.toRawData(Integer.parseInt(key), -1);
+            }
+
+            mappings.put(unmappedId, new MappedLegacyBlockItem(id, data, name, type));
+            return;
+        }
+
+        // Range of ids
+        String[] split = key.split("-", 2);
+        int from = Integer.parseInt(split[0]);
+        int to = Integer.parseInt(split[1]);
+
+        // Special block color handling
+        if (name != null && name.contains("%color%")) {
+            for (int i = from; i <= to; i++) {
+                mappings.put(IdAndData.toRawData(i, -1), new MappedLegacyBlockItem(id, data, name.replace("%color%", BlockColors.get(i - from)), type));
+            }
+        } else {
+            MappedLegacyBlockItem mappedBlockItem = new MappedLegacyBlockItem(id, data, name, type);
+            for (int i = from; i <= to; i++) {
+                mappings.put(IdAndData.toRawData(i, -1), mappedBlockItem);
+            }
+        }
+    }
+
+    public void registerBlockChange(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.POSITION1_8); // 0 - Block Position
+                map(Type.VAR_INT); // 1 - Block
+
+                handler(wrapper -> {
+                    int idx = wrapper.get(Type.VAR_INT, 0);
+                    wrapper.set(Type.VAR_INT, 0, handleBlockId(idx));
+                });
+            }
+        });
+    }
+
+    public void registerMultiBlockChange(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Chunk X
+                map(Type.INT); // 1 - Chunk Z
+                map(Type.BLOCK_CHANGE_RECORD_ARRAY);
+
+                handler(wrapper -> {
+                    for (BlockChangeRecord record : wrapper.get(Type.BLOCK_CHANGE_RECORD_ARRAY, 0)) {
+                        record.setBlockId(handleBlockId(record.getBlockId()));
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, @Nullable Item item) {
+        if (item == null) return null;
+
+        MappedLegacyBlockItem data = getMappedItem(item.identifier(), item.data());
+        if (data == null) {
+            // Just rewrite the id
+            return super.handleItemToClient(connection, item);
+        }
+        if (item.tag() == null) {
+            item.setTag(new CompoundTag());
+        }
+
+        short originalData = item.data();
+        item.tag().putInt(nbtTagName("id"), item.identifier());
+        item.setIdentifier(data.getId());
+        // Keep original data if mapped data is set to -1
+        if (data.getData() != -1) {
+            item.setData(data.getData());
+            item.tag().putShort(nbtTagName("data"), originalData);
+        }
+
+        // Set display name
+        if (data.getName() != null) {
+            CompoundTag display = item.tag().getCompoundTag("display");
+            if (display == null) {
+                item.tag().put("display", display = new CompoundTag());
+            }
+
+            StringTag nameTag = display.getStringTag("Name");
+            if (nameTag == null) {
+                nameTag = new StringTag(data.getName());
+                display.put("Name", nameTag);
+                display.put(nbtTagName("customName"), new ByteTag());
+            }
+
+            // Handle colors
+            String value = nameTag.getValue();
+            if (value.contains("%vb_color%")) {
+                display.putString("Name", value.replace("%vb_color%", BlockColors.get(originalData)));
+            }
+        }
+        return item;
+    }
+
+    @Override
+    public @Nullable Item handleItemToServer(UserConnection connection, @Nullable final Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+        if (item.tag() != null) {
+            Tag originalId = item.tag().remove(nbtTagName("id"));
+            if (originalId instanceof IntTag) {
+                item.setIdentifier(((NumberTag) originalId).asInt());
+            }
+            Tag originalData = item.tag().remove(nbtTagName("data"));
+            if (originalData instanceof ShortTag) {
+                item.setData(((NumberTag) originalData).asShort());
+            }
+        }
+        return item;
+    }
+
+    public PacketHandler getFallingBlockHandler() {
+        return wrapper -> {
+            final Optional<EntityTypes1_12.ObjectType> type = EntityTypes1_12.ObjectType.findById(wrapper.get(Type.BYTE, 0));
+            if (type.isPresent() && type.get() == EntityTypes1_12.ObjectType.FALLING_BLOCK) {
+                final int objectData = wrapper.get(Type.INT, 0);
+
+                final IdAndData block = handleBlock(objectData & 4095, objectData >> 12 & 15);
+                if (block == null) return;
+
+                wrapper.set(Type.INT, 0, block.getId() | block.getData() << 12);
+            }
+        };
+    }
+
+    public @Nullable IdAndData handleBlock(int blockId, int data) {
+        MappedLegacyBlockItem settings = getMappedBlock(blockId, data);
+        if (settings == null) {
+            return null;
+        }
+
+        IdAndData block = settings.getBlock();
+        // For some blocks, the data can still be useful (:
+        if (block.getData() == -1) {
+            return block.withData(data);
+        }
+        return block;
+    }
+
+    public int handleBlockId(final int rawId) {
+        final int id = IdAndData.getId(rawId);
+        final int data = IdAndData.getData(rawId);
+
+        final IdAndData mappedBlock = handleBlock(id, data);
+        if (mappedBlock == null) return rawId;
+
+        return IdAndData.toRawData(mappedBlock.getId(), mappedBlock.getData());
+    }
+
+    public void handleChunk(Chunk chunk) {
+        // Map Block Entities
+        Map<Pos, CompoundTag> tags = new HashMap<>();
+        for (CompoundTag tag : chunk.getBlockEntities()) {
+            NumberTag xTag;
+            NumberTag yTag;
+            NumberTag zTag;
+            if ((xTag = tag.getNumberTag("x")) == null
+                || (yTag = tag.getNumberTag("y")) == null
+                || (zTag = tag.getNumberTag("z")) == null) {
+                continue;
+            }
+
+            Pos pos = new Pos(xTag.asInt() & 0xF, yTag.asInt(), 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.palette(PaletteType.BLOCKS).idAt(pos.getX(), pos.getY() & 0xF, pos.getZ());
+
+            MappedLegacyBlockItem settings = getMappedBlock(block);
+            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
+            DataPalette palette = section.palette(PaletteType.BLOCKS);
+            for (int j = 0; j < palette.size(); j++) {
+                int block = palette.idByIndex(j);
+                int btype = block >> 4;
+                int meta = block & 0xF;
+
+                IdAndData b = handleBlock(btype, meta);
+                if (b != null) {
+                    palette.setIdByIndex(j, IdAndData.toRawData(b.getId(), b.getData()));
+                }
+
+                // We already know that is has a handler
+                if (hasBlockEntityHandler) continue;
+
+                MappedLegacyBlockItem settings = getMappedBlock(block);
+                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 = palette.idAt(x, y, z);
+
+                        MappedLegacyBlockItem settings = getMappedBlock(block);
+                        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.putInt("x", x + (chunk.getX() << 4));
+                        tag.putInt("y", y + (i << 4));
+                        tag.putInt("z", z + (chunk.getZ() << 4));
+
+                        settings.getBlockEntityHandler().handleOrNewCompoundTag(block, tag);
+                        chunk.getBlockEntities().add(tag);
+                    }
+                }
+            }
+        }
+    }
+
+    protected CompoundTag getNamedTag(String text) {
+        CompoundTag tag = new CompoundTag();
+        CompoundTag displayTag = new CompoundTag();
+        tag.put("display", displayTag);
+        text = "§r" + text;
+        displayTag.putString("Name", jsonNameFormat ? ComponentUtil.legacyToJsonString(text) : text);
+        return tag;
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedBlock(int id, int data) {
+        MappedLegacyBlockItem mapping = blockReplacements.get(IdAndData.toRawData(id, data));
+        return mapping != null ? mapping : blockReplacements.get(IdAndData.toRawData(id, -1));
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedItem(int id, int data) {
+        MappedLegacyBlockItem mapping = itemReplacements.get(IdAndData.toRawData(id, data));
+        return mapping != null ? mapping : itemReplacements.get(IdAndData.toRawData(id, -1));
+    }
+
+    private @Nullable MappedLegacyBlockItem getMappedBlock(int rawId) {
+        int id = IdAndData.getId(rawId);
+        int data = IdAndData.getData(rawId);
+        return getMappedBlock(id, data);
+    }
+
+    protected JsonObject readMappingsFile(final String name) {
+        return BackwardsMappingDataLoader.INSTANCE.loadFromDataDir(name);
+    }
+
+    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 +1,191 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.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.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 final boolean dummyEnchantment;
+
+    private Set<Short> hideLevelForEnchants;
+
+    public LegacyEnchantmentRewriter(String nbtTagName) {
+        this(nbtTagName, true);
+    }
+
+    public LegacyEnchantmentRewriter(String nbtTagName, boolean dummyEnchantment) {
+        this.nbtTagName = nbtTagName;
+        this.dummyEnchantment = dummyEnchantment;
+    }
+
+    public void registerEnchantment(int id, String replacementLore) {
+        enchantmentMappings.put((short) id, replacementLore);
+    }
+
+    public void handleToClient(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.getListTag("ench") != null) {
+            rewriteEnchantmentsToClient(tag, false);
+        }
+        if (tag.getListTag("StoredEnchantments") != null) {
+            rewriteEnchantmentsToClient(tag, true);
+        }
+    }
+
+    public void handleToServer(Item item) {
+        CompoundTag tag = item.tag();
+        if (tag == null) return;
+
+        if (tag.contains(nbtTagName + "|ench")) {
+            rewriteEnchantmentsToServer(tag, false);
+        }
+        if (tag.contains(nbtTagName + "|StoredEnchantments")) {
+            rewriteEnchantmentsToServer(tag, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(CompoundTag tag, boolean storedEnchant) {
+        String key = storedEnchant ? "StoredEnchantments" : "ench";
+        ListTag<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        ListTag<CompoundTag> remappedEnchantments = new ListTag<>(CompoundTag.class);
+        List<StringTag> lore = new ArrayList<>();
+        for (CompoundTag enchantmentEntry : enchantments.copy()) {
+            NumberTag idTag = enchantmentEntry.getNumberTag("id");
+            if (idTag == null) continue;
+
+            short newId = idTag.asShort();
+            String enchantmentName = enchantmentMappings.get(newId);
+            if (enchantmentName != null) {
+                enchantments.remove(enchantmentEntry);
+                NumberTag levelTag = enchantmentEntry.getNumberTag("lvl");
+                short level = levelTag != null ? levelTag.asShort() : 1;
+                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 (this.dummyEnchantment && !storedEnchant && enchantments.isEmpty()) {
+                CompoundTag dummyEnchantment = new CompoundTag();
+                dummyEnchantment.putShort("id", (short) 0);
+                dummyEnchantment.putShort("lvl", (short) 0);
+
+                enchantments.add(dummyEnchantment);
+                tag.put(nbtTagName + "|dummyEnchant", new ByteTag());
+
+                NumberTag hideFlags = tag.getNumberTag("HideFlags");
+                if (hideFlags == null) {
+                    hideFlags = new IntTag();
+                } else {
+                    tag.putInt(nbtTagName + "|oldHideFlags", hideFlags.asByte());
+                }
+
+                int flags = hideFlags.asByte() | 1;
+                tag.putInt("HideFlags", flags);
+            }
+
+            tag.put(nbtTagName + "|" + key, remappedEnchantments);
+
+            CompoundTag display = tag.getCompoundTag("display");
+            if (display == null) {
+                tag.put("display", display = new CompoundTag());
+            }
+            ListTag<StringTag> loreTag = display.getListTag("Lore", StringTag.class);
+            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<CompoundTag> enchantments = tag.getListTag(key, CompoundTag.class);
+        if (enchantments == null) {
+            enchantments = new ListTag<>(CompoundTag.class);
+        }
+
+        if (!storedEnchant && tag.remove(nbtTagName + "|dummyEnchant") != null) {
+            for (CompoundTag enchantment : enchantments.copy()) {
+                NumberTag idTag = enchantment.getNumberTag("id");
+                NumberTag levelTag = enchantment.getNumberTag("lvl");
+                short id = idTag != null ? idTag.asShort() : 0;
+                short level = levelTag != null ? levelTag.asShort() : 0;
+                if (id == 0 && level == 0) {
+                    enchantments.remove(enchantment);
+                }
+            }
+
+            Tag hideFlags = tag.remove(nbtTagName + "|oldHideFlags");
+            if (hideFlags instanceof IntTag) {
+                tag.putInt("HideFlags", ((IntTag) hideFlags).asByte());
+            } else {
+                tag.remove("HideFlags");
+            }
+        }
+
+        CompoundTag display = tag.getCompoundTag("display");
+        // A few null checks just to be safe, though they shouldn't actually be
+        ListTag<StringTag> lore = display != null ? display.getListTag("Lore", StringTag.class) : null;
+        ListTag<CompoundTag> remappedEnchantments = tag.remove(nbtTagName + "|" + key);
+        for (CompoundTag enchantment : remappedEnchantments.copy()) {
+            enchantments.add(enchantment);
+            if (lore != null && !lore.isEmpty()) {
+                lore.remove(lore.get(0));
+            }
+        }
+        if (lore != null && lore.isEmpty()) {
+            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 +1,182 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.ClientWorld;
+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.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Function;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public abstract class LegacyEntityRewriter<C extends ClientboundPacketType, T extends BackwardsProtocol<C, ?, ?, ?>> extends EntityRewriterBase<C, 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(C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT);
+                handler(wrapper -> {
+                    ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+                    clientWorld.setEnvironment(wrapper.get(Type.INT, 0));
+                });
+            }
+        });
+    }
+
+    protected void registerJoinGame(C packetType, EntityType playerType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(C packetType, Type<List<Metadata>> oldMetaType, Type<List<Metadata>> newMetaType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(C packetType, Type<List<Metadata>> metaType) {
+        registerMetadataRewriter(packetType, null, metaType);
+    }
+
+    protected PacketHandler getMobSpawnRewriter(Type<List<Metadata>> metaType, IdSetter idSetter) {
+        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) {
+                idSetter.setId(wrapper, entityData.replacementId());
+                if (entityData.hasBaseMeta()) {
+                    entityData.defaultMeta().createMeta(new WrappedMetadata(metadata));
+                }
+            }
+        };
+    }
+
+    public PacketHandler getMobSpawnRewriter(Type<List<Metadata>> metaType) {
+        return getMobSpawnRewriter(metaType, (wrapper, id) -> wrapper.set(Type.UNSIGNED_BYTE, 0, (short) id));
+    }
+
+    public PacketHandler getMobSpawnRewriter1_11(Type<List<Metadata>> metaType) {
+        return getMobSpawnRewriter(metaType, (wrapper, id) -> wrapper.set(Type.VAR_INT, 1, id));
+    }
+
+    protected PacketHandler getObjectTrackerHandler() {
+        return wrapper -> addTrackedEntity(wrapper, wrapper.get(Type.VAR_INT, 0), objectTypeFromId(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());
+                }
+            }
+        };
+    }
+
+    @Deprecated
+    protected void addTrackedEntity(PacketWrapper wrapper, int entityId, EntityType type) throws Exception {
+        tracker(wrapper.user()).addEntity(entityId, type);
+    }
+
+    @FunctionalInterface
+    protected interface IdSetter {
+
+        void setId(PacketWrapper wrapper, int id) throws Exception;
+    }
+}

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) 2016-2024 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 +1,59 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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
+                wrapper.passthrough(Type.OPTIONAL_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 +1,137 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.Holder;
+import com.viaversion.viaversion.api.minecraft.SoundEvent;
+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.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+
+public class SoundRewriter<C extends ClientboundPacketType> extends com.viaversion.viaversion.rewriter.SoundRewriter<C> {
+
+    private final BackwardsProtocol<C, ?, ?, ?> protocol;
+
+    public SoundRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol) {
+        super(protocol);
+        this.protocol = protocol;
+    }
+
+    public void registerNamedSound(final C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.STRING); // Sound identifier
+                handler(getNamedSoundHandler());
+            }
+        });
+    }
+
+    public void registerStopSound(final C packetType) {
+        protocol.registerClientbound(packetType, new PacketHandlers() {
+            @Override
+            public void register() {
+                handler(getStopSoundHandler());
+            }
+        });
+    }
+
+    public PacketHandler getNamedSoundHandler() {
+        return wrapper -> {
+            final String soundId = wrapper.get(Type.STRING, 0);
+            final 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 -> {
+            final byte flags = wrapper.passthrough(Type.BYTE);
+            if ((flags & 0x02) == 0) return; // No sound specified
+
+            if ((flags & 0x01) != 0) {
+                wrapper.passthrough(Type.VAR_INT); // Source
+            }
+
+            final String soundId = wrapper.read(Type.STRING);
+            final 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();
+            }
+        };
+    }
+
+    @Override
+    public void register1_19_3Sound(final C packetType) {
+        protocol.registerClientbound(packetType, get1_19_3SoundHandler());
+    }
+
+    public PacketHandler get1_19_3SoundHandler() {
+        return wrapper -> {
+            Holder<SoundEvent> soundEventHolder = wrapper.read(Type.SOUND_EVENT);
+            if (soundEventHolder.isDirect()) {
+                wrapper.write(Type.SOUND_EVENT, rewriteSoundEvent(wrapper, soundEventHolder));
+                return;
+            }
+
+            final int mappedId = idRewriter.rewrite(soundEventHolder.id());
+            if (mappedId == -1) {
+                wrapper.cancel();
+                return;
+            }
+
+            if (mappedId != soundEventHolder.id()) {
+                soundEventHolder = Holder.of(mappedId);
+            }
+
+            wrapper.write(Type.SOUND_EVENT, soundEventHolder);
+        };
+    }
+
+    public Holder<SoundEvent> rewriteSoundEvent(final PacketWrapper wrapper, final Holder<SoundEvent> soundEventHolder) {
+        final SoundEvent soundEvent = soundEventHolder.value();
+        final String mappedIdentifier = protocol.getMappingData().getMappedNamedSound(soundEvent.identifier());
+        if (mappedIdentifier != null) {
+            if (!mappedIdentifier.isEmpty()) {
+                return Holder.of(soundEvent.withIdentifier(mappedIdentifier));
+            }
+            wrapper.cancel();
+        }
+        return soundEventHolder;
+    }
+}

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

@@ -0,0 +1,189 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.BackwardsMappings;
+import com.viaversion.viaversion.api.data.Mappings;
+import com.viaversion.viaversion.api.minecraft.data.StructuredData;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataContainer;
+import com.viaversion.viaversion.api.minecraft.data.StructuredDataKey;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.minecraft.item.data.Enchantments;
+import com.viaversion.viaversion.libs.fastutil.ints.Int2IntMap;
+import com.viaversion.viaversion.libs.fastutil.ints.IntIntPair;
+import com.viaversion.viaversion.libs.fastutil.objects.ObjectIterator;
+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.ListTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.NumberTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.Tag;
+import com.viaversion.viaversion.util.ComponentUtil;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class StructuredEnchantmentRewriter {
+
+    protected final BackwardsItemRewriter<?, ?, ?> itemRewriter;
+    private boolean rewriteIds = true;
+
+    public StructuredEnchantmentRewriter(final BackwardsItemRewriter<?, ?, ?> itemRewriter) {
+        this.itemRewriter = itemRewriter;
+    }
+
+    public void handleToClient(final Item item) {
+        final StructuredDataContainer data = item.structuredData();
+        rewriteEnchantmentsToClient(data, StructuredDataKey.ENCHANTMENTS, false);
+        rewriteEnchantmentsToClient(data, StructuredDataKey.STORED_ENCHANTMENTS, true);
+    }
+
+    public void handleToServer(final Item item) {
+        final StructuredDataContainer data = item.structuredData();
+        final StructuredData<CompoundTag> customData = data.getNonEmpty(StructuredDataKey.CUSTOM_DATA);
+        if (customData == null) {
+            return;
+        }
+
+        final CompoundTag tag = customData.value();
+        if (tag.contains(itemRewriter.nbtTagName("enchantments"))) {
+            rewriteEnchantmentsToServer(data, tag, StructuredDataKey.ENCHANTMENTS, false);
+        }
+        if (tag.contains(itemRewriter.nbtTagName("stored_enchantments"))) {
+            rewriteEnchantmentsToServer(data, tag, StructuredDataKey.STORED_ENCHANTMENTS, true);
+        }
+    }
+
+    public void rewriteEnchantmentsToClient(final StructuredDataContainer data, final StructuredDataKey<Enchantments> key, final boolean storedEnchant) {
+        final StructuredData<Enchantments> enchantmentsData = data.getNonEmpty(key);
+        if (enchantmentsData == null) {
+            return;
+        }
+
+        final CompoundTag tag = data.computeIfAbsent(StructuredDataKey.CUSTOM_DATA, $ -> new CompoundTag()).value();
+        final Enchantments enchantments = enchantmentsData.value();
+        final List<Tag> loreToAdd = new ArrayList<>();
+        boolean changed = false;
+
+        final ObjectIterator<Int2IntMap.Entry> iterator = enchantments.enchantments().int2IntEntrySet().iterator();
+        final List<IntIntPair> updatedIds = new ArrayList<>();
+        while (iterator.hasNext()) {
+            final Int2IntMap.Entry entry = iterator.next();
+            final BackwardsMappings mappingData = itemRewriter.protocol().getMappingData();
+            final Mappings mappings = mappingData.getEnchantmentMappings();
+            final int mappedId = mappings.getNewId(entry.getIntKey());
+            if (mappedId != -1) {
+                if (rewriteIds) {
+                    // Update the map after to iteration to preserve the current ids before possibly saving the original, avoid CME
+                    updatedIds.add(IntIntPair.of(entry.getIntKey(), mappedId));
+                }
+                continue;
+            }
+
+            final String remappedName = mappingData.mappedEnchantmentName(entry.getIntKey());
+            if (remappedName != null) {
+                if (!changed) {
+                    // Backup original before doing modifications
+                    itemRewriter.saveListTag(tag, asTag(enchantments), key.identifier());
+                    changed = true;
+                }
+
+                final int level = entry.getIntValue();
+                loreToAdd.add(ComponentUtil.jsonStringToTag(ComponentUtil.legacyToJsonString("§7" + remappedName + " " + EnchantmentRewriter.getRomanNumber(level), true)));
+                iterator.remove();
+            }
+        }
+
+        for (final IntIntPair pair : updatedIds) {
+            enchantments.add(pair.firstInt(), pair.secondInt());
+        }
+
+        if (loreToAdd.isEmpty()) {
+            // No removed enchantments
+            return;
+        }
+
+        // Add glint override if there are no enchantments left
+        if (!storedEnchant && enchantments.size() == 0) {
+            final StructuredData<Boolean> glintOverride = data.getNonEmpty(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE);
+            if (glintOverride != null) {
+                tag.putBoolean(itemRewriter.nbtTagName("glint"), glintOverride.value());
+            } else {
+                tag.putBoolean(itemRewriter.nbtTagName("noglint"), true);
+            }
+            data.set(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE, true);
+        }
+
+        // Save original lore
+        final StructuredData<Tag[]> loreData = data.getNonEmpty(StructuredDataKey.LORE);
+        if (loreData != null) {
+            final List<Tag> loreList = Arrays.asList(loreData.value());
+            itemRewriter.saveGenericTagList(tag, loreList, "lore");
+            loreToAdd.addAll(loreList);
+        } else {
+            tag.putBoolean(itemRewriter.nbtTagName("nolore"), true);
+        }
+
+        if (enchantments.showInTooltip()) {
+            tag.putBoolean(itemRewriter.nbtTagName("show_" + key.identifier()), true);
+        }
+
+        data.set(StructuredDataKey.LORE, loreToAdd.toArray(new Tag[0]));
+    }
+
+    private ListTag<CompoundTag> asTag(final Enchantments enchantments) {
+        final ListTag<CompoundTag> listTag = new ListTag<>(CompoundTag.class);
+        for (final Int2IntMap.Entry entry : enchantments.enchantments().int2IntEntrySet()) {
+            final CompoundTag enchantment = new CompoundTag();
+            enchantment.putInt("id", entry.getIntKey());
+            enchantment.putInt("lvl", entry.getIntValue());
+            listTag.add(enchantment);
+        }
+        return listTag;
+    }
+
+    public void rewriteEnchantmentsToServer(final StructuredDataContainer data, final CompoundTag tag, final StructuredDataKey<Enchantments> key, final boolean storedEnchant) {
+        final ListTag<CompoundTag> enchantmentsTag = itemRewriter.removeListTag(tag, key.identifier(), CompoundTag.class);
+        if (enchantmentsTag == null) {
+            return;
+        }
+
+        final Tag glintTag = tag.remove(itemRewriter.nbtTagName("glint"));
+        if (glintTag instanceof ByteTag) {
+            data.set(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE, ((NumberTag) glintTag).asBoolean());
+        } else if (tag.remove(itemRewriter.nbtTagName("noglint")) != null) {
+            data.remove(StructuredDataKey.ENCHANTMENT_GLINT_OVERRIDE);
+        }
+
+        final List<Tag> lore = itemRewriter.removeGenericTagList(tag, "lore");
+        if (lore != null) {
+            data.set(StructuredDataKey.LORE, lore.toArray(new Tag[0]));
+        } else if (tag.remove(itemRewriter.nbtTagName("nolore")) != null) {
+            data.remove(StructuredDataKey.LORE);
+        }
+
+        final Enchantments enchantments = new Enchantments(tag.remove(itemRewriter.nbtTagName("show_" + key.identifier())) != null);
+        for (final CompoundTag enchantment : enchantmentsTag) {
+            enchantments.add(enchantment.getInt("id"), enchantment.getInt("lvl"));
+        }
+        data.set(key, enchantments);
+    }
+
+    public void setRewriteIds(final boolean rewriteIds) {
+        this.rewriteIds = rewriteIds;
+    }
+}

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

@@ -0,0 +1,84 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.BackwardsMappingDataLoader;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.packet.ClientboundPacketType;
+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.StringTag;
+import com.viaversion.viaversion.rewriter.ComponentRewriter;
+import java.util.HashMap;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class TranslatableRewriter<C extends ClientboundPacketType> extends ComponentRewriter<C> {
+
+    private static final Map<String, Map<String, String>> TRANSLATABLES = new HashMap<>();
+    private final Map<String, String> translatables;
+
+    public static void loadTranslatables() {
+        final JsonObject jsonObject = BackwardsMappingDataLoader.INSTANCE.loadFromDataDir("translation-mappings.json");
+        for (final Map.Entry<String, JsonElement> entry : jsonObject.entrySet()) {
+            final Map<String, String> versionMappings = new HashMap<>();
+            TRANSLATABLES.put(entry.getKey(), versionMappings);
+            for (final Map.Entry<String, JsonElement> translationEntry : entry.getValue().getAsJsonObject().entrySet()) {
+                versionMappings.put(translationEntry.getKey(), translationEntry.getValue().getAsString());
+            }
+        }
+    }
+
+    public TranslatableRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type) {
+        this(protocol, type, protocol.getClass().getSimpleName().split("To")[1].replace("_", "."));
+    }
+
+    public TranslatableRewriter(final BackwardsProtocol<C, ?, ?, ?> protocol, final ReadType type, final String sectionIdentifier) {
+        super(protocol, type);
+        final Map<String, String> translatableMappings = TRANSLATABLES.get(sectionIdentifier);
+        if (translatableMappings == null) {
+            ViaBackwards.getPlatform().getLogger().warning("Missing " + sectionIdentifier + " translatables!");
+            this.translatables = new HashMap<>();
+        } else {
+            this.translatables = translatableMappings;
+        }
+    }
+
+    @Override
+    protected void handleTranslate(final JsonObject root, final String translate) {
+        final String newTranslate = mappedTranslationKey(translate);
+        if (newTranslate != null) {
+            root.addProperty("translate", newTranslate);
+        }
+    }
+
+    @Override
+    protected void handleTranslate(final UserConnection connection, final CompoundTag parentTag, final StringTag translateTag) {
+        final String newTranslate = mappedTranslationKey(translateTag.getValue());
+        if (newTranslate != null) {
+            parentTag.put("translate", new StringTag(newTranslate));
+        }
+    }
+
+    public @Nullable String mappedTranslationKey(final String translationKey) {
+        return translatables.get(translationKey);
+    }
+}

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

@@ -0,0 +1,88 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+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;
+
+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");
+    private final EntityPackets1_11 entityPackets = new EntityPackets1_11(this);
+    private final BlockItemPackets1_11 blockItemPackets = new BlockItemPackets1_11(this);
+
+    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.register();
+        entityPackets.register();
+        PlayerPackets1_11.register(this);
+
+        SoundRewriter<ClientboundPackets1_9_3> soundRewriter = new SoundRewriter<>(this);
+        soundRewriter.registerNamedSound(ClientboundPackets1_9_3.NAMED_SOUND);
+        soundRewriter.registerSound(ClientboundPackets1_9_3.SOUND);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+
+        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/data/PotionSplashHandler.java

@@ -0,0 +1,48 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data;
+
+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/packets/BlockItemPackets1_11.java

@@ -0,0 +1,380 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.minecraft.item.DataItem;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_3;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+import com.viaversion.viaversion.protocols.protocol1_11to1_10.rewriter.EntityIdRewriter;
+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.util.IdAndData;
+import java.util.Arrays;
+import java.util.Optional;
+
+public class BlockItemPackets1_11 extends LegacyBlockItemRewriter<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_10To1_11> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public BlockItemPackets1_11(Protocol1_10To1_11 protocol) {
+        super(protocol, "1.11");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_9_3.BLOCK_CHANGE);
+        registerMultiBlockChange(ClientboundPackets1_9_3.MULTI_BLOCK_CHANGE);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SET_SLOT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.SHORT); // 1 - Slot ID
+                map(Type.ITEM1_8); // 2 - Slot Value
+
+                handler(wrapper -> handleItemToClient(wrapper.user(), wrapper.get(Type.ITEM1_8, 0)));
+
+                // Handle Llama
+                handler(wrapper -> {
+                    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.ITEM1_8, 0, getNewItem(storage, currentSlot, wrapper.get(Type.ITEM1_8, 0)));
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.WINDOW_ITEMS, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.UNSIGNED_BYTE); // 0 - Window ID
+                map(Type.ITEM1_8_SHORT_ARRAY); // 1 - Window Values
+
+                handler(wrapper -> {
+                    Item[] stacks = wrapper.get(Type.ITEM1_8_SHORT_ARRAY, 0);
+                    for (int i = 0; i < stacks.length; i++)
+                        stacks[i] = handleItemToClient(wrapper.user(), 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.ITEM1_8_SHORT_ARRAY, 0, stacks);
+                    }
+                });
+            }
+        });
+
+        registerEntityEquipment(ClientboundPackets1_9_3.ENTITY_EQUIPMENT);
+
+        // Plugin message -> Trading
+        protocol.registerClientbound(ClientboundPackets1_9_3.PLUGIN_MESSAGE, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(wrapper -> {
+                    if (wrapper.get(Type.STRING, 0).equals("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.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Input Item
+                            wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Output Item
+
+                            boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                            if (secondItem) {
+                                wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // 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 PacketHandlers() {
+            @Override
+            public void register() {
+                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.ITEM1_8); // 5 - Clicked Item
+
+                handler(wrapper -> handleItemToServer(wrapper.user(), wrapper.get(Type.ITEM1_8, 0)));
+
+                // Llama slot
+                handler(wrapper -> {
+                    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);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.CHUNK_DATA, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment()); // 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()) {
+                StringTag idTag = tag.getStringTag("id");
+                if (idTag == null) continue;
+
+                String id = idTag.getValue();
+                if (id.equals("minecraft:sign")) {
+                    idTag.setValue("Sign");
+                }
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.BLOCK_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.POSITION1_8); // 0 - Position
+                map(Type.UNSIGNED_BYTE); // 1 - Action
+                map(Type.NAMED_COMPOUND_TAG); // 2 - NBT
+
+                handler(wrapper -> {
+                    // 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.NAMED_COMPOUND_TAG, 0);
+                        EntityIdRewriter.toClientSpawner(tag, true);
+                    }
+                });
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.OPEN_WINDOW, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(wrapper -> {
+                    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 PacketHandlers() {
+            @Override
+            public void register() {
+                // Inventory tracking
+                handler(wrapper -> {
+                    WindowTracker windowTracker = wrapper.user().get(WindowTracker.class);
+                    windowTracker.setInventory(null);
+                    windowTracker.setEntityId(-1);
+                });
+            }
+        });
+
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLOSE_WINDOW, new PacketHandlers() {
+            @Override
+            public void register() {
+                // Inventory tracking
+                handler(wrapper -> {
+                    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.ITEM1_8)) // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Handle spawner block entity (map to itself with custom handler)
+        MappedLegacyBlockItem data = itemReplacements.computeIfAbsent(IdAndData.toRawData(52), s -> new MappedLegacyBlockItem(52));
+        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(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, 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);
+
+        enchantmentRewriter.handleToClient(item);
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, 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);
+
+        enchantmentRewriter.handleToServer(item);
+        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(EntityTypes1_11.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 +1,375 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.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.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.minecraft.metadata.Metadata;
+import com.viaversion.viaversion.api.minecraft.metadata.types.MetaType1_9;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+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;
+
+public class EntityPackets1_11 extends LegacyEntityRewriter<ClientboundPackets1_9_3, Protocol1_10To1_11> {
+
+    public EntityPackets1_11(Protocol1_10To1_11 protocol) {
+        super(protocol);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_9_3.EFFECT, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT);
+                map(Type.POSITION1_8);
+                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 PacketHandlers() {
+            @Override
+            public void register() {
+                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 -> EntityTypes1_11.ObjectType.findById(id).orElse(null)));
+
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_EXPERIENCE_ORB, EntityTypes1_11.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.SPAWN_GLOBAL_ENTITY, EntityTypes1_11.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(getMobSpawnRewriter(Types1_9.METADATA_LIST));
+
+                // Sub 1.11 clients will error if the list is empty
+                handler(wrapper -> {
+                    List<Metadata> metadata = wrapper.get(Types1_9.METADATA_LIST, 0);
+                    if (metadata.isEmpty()) {
+                        metadata.add(new Metadata(0, MetaType1_9.Byte, (byte) 0));
+                    }
+                });
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_PAINTING, EntityTypes1_11.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.JOIN_GAME, EntityTypes1_11.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                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, EntityTypes1_11.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 PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.BYTE); // 1 - Entity Status
+
+                handler(wrapper -> {
+                    byte b = wrapper.get(Type.BYTE, 0);
+
+                    if (b == 35) {
+                        wrapper.clearPacket();
+                        wrapper.setPacketType(ClientboundPackets1_9_3.GAME_EVENT);
+                        wrapper.write(Type.UNSIGNED_BYTE, (short) 10); // Play Elder Guardian animation
+                        wrapper.write(Type.FLOAT, 0F);
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        // Guardian
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ELDER_GUARDIAN, EntityTypes1_11.EntityType.GUARDIAN);
+        // Skeletons
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.WITHER_SKELETON, EntityTypes1_11.EntityType.SKELETON).spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.STRAY, EntityTypes1_11.EntityType.SKELETON).plainName().spawnMetadata(storage -> storage.add(getSkeletonTypeMeta(2)));
+        // Zombies
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HUSK, EntityTypes1_11.EntityType.ZOMBIE).plainName().spawnMetadata(storage -> handleZombieType(storage, 6));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_VILLAGER, EntityTypes1_11.EntityType.ZOMBIE).spawnMetadata(storage -> handleZombieType(storage, 1));
+        // Horses
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(0))); // Nob able to ride the horse without having the MetaType sent.
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.DONKEY, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.MULE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(2)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.SKELETON_HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(4)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.ZOMBIE_HORSE, EntityTypes1_11.EntityType.HORSE).spawnMetadata(storage -> storage.add(getHorseMetaType(3)));
+        // New mobs
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.EVOCATION_FANGS, EntityTypes1_11.EntityType.SHULKER);
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.EVOCATION_ILLAGER, EntityTypes1_11.EntityType.VILLAGER).plainName();
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.VEX, EntityTypes1_11.EntityType.BAT).plainName();
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.VINDICATION_ILLAGER, EntityTypes1_11.EntityType.VILLAGER).plainName().spawnMetadata(storage -> storage.add(new Metadata(13, MetaType1_9.VarInt, 4))); // Base Profession
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.LIAMA, EntityTypes1_11.EntityType.HORSE).plainName().spawnMetadata(storage -> storage.add(getHorseMetaType(1)));
+        mapEntityTypeWithData(EntityTypes1_11.EntityType.LIAMA_SPIT, EntityTypes1_11.EntityType.SNOWBALL);
+
+        mapObjectType(EntityTypes1_11.ObjectType.LIAMA_SPIT, EntityTypes1_11.ObjectType.SNOWBALL, -1);
+        // Replace with endertorchthingies
+        mapObjectType(EntityTypes1_11.ObjectType.EVOCATION_FANGS, EntityTypes1_11.ObjectType.FALLING_BLOCK, 198 | 1 << 12);
+
+        // Handle ElderGuardian & target metadata
+        filter().type(EntityTypes1_11.EntityType.GUARDIAN).index(12).handler((event, meta) -> {
+            boolean b = (boolean) meta.getValue();
+            int bitmask = b ? 0x02 : 0;
+
+            if (event.entityType() == EntityTypes1_11.EntityType.ELDER_GUARDIAN) {
+                bitmask |= 0x04;
+            }
+
+            meta.setTypeAndValue(MetaType1_9.Byte, (byte) bitmask);
+        });
+
+        // Handle skeleton swing
+        filter().type(EntityTypes1_11.EntityType.ABSTRACT_SKELETON).index(12).toIndex(13);
+
+        /*
+            ZOMBIE CHANGES
+         */
+        filter().type(EntityTypes1_11.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(EntityTypes1_11.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(EntityTypes1_11.EntityType.VEX).index(12).handler((event, meta) -> {
+            meta.setValue((byte) 0x00);
+        });
+
+        // Handle VindicationIllager
+        filter().type(EntityTypes1_11.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().type(EntityTypes1_11.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().type(EntityTypes1_11.EntityType.CHESTED_HORSE).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ChestedHorseStorage.class)) {
+                data.put(new ChestedHorseStorage());
+            }
+        });
+
+        // Handle horse armor
+        filter().type(EntityTypes1_11.EntityType.HORSE).index(16).toIndex(17);
+
+        // Handle chested horse
+        filter().type(EntityTypes1_11.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(EntityTypes1_11.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().type(EntityTypes1_11.EntityType.ABSTRACT_HORSE).index(14).toIndex(16);
+
+        // Handle villager - Change non-existing profession
+        filter().type(EntityTypes1_11.EntityType.VILLAGER).index(13).handler((event, meta) -> {
+            if ((int) meta.getValue() == 5) {
+                meta.setValue(0);
+            }
+        });
+
+        // handle new Shulker color meta
+        filter().type(EntityTypes1_11.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 EntityTypes1_11.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, true);
+    }
+}

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

@@ -0,0 +1,93 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.PacketHandlers;
+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.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.util.ComponentUtil;
+
+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 / 16f;
+        }
+    };
+
+    public static void register(Protocol1_10To1_11 protocol) {
+        protocol.registerClientbound(ClientboundPackets1_9_3.TITLE, new PacketHandlers() {
+            @Override
+            public void register() {
+                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.setPacketType(ClientboundPackets1_9_3.CHAT_MESSAGE);
+
+                        // https://bugs.mojang.com/browse/MC-119145
+                        String legacy = ComponentUtil.jsonToLegacy(message);
+                        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 PacketHandlers() {
+            @Override
+            public void register() {
+                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 PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.POSITION1_8); // 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) 2016-2024 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) 2016-2024 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 +1,100 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+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_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");
+    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, 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.STRING_TO_JSON.transform(wrapper, component.toString()));
+            }
+        });
+
+        cancelClientbound(ClientboundPackets1_12.ADVANCEMENTS);
+        cancelClientbound(ClientboundPackets1_12.UNLOCK_RECIPES);
+        cancelClientbound(ClientboundPackets1_12.SELECT_ADVANCEMENTS_TAB);
+    }
+
+    @Override
+    public void init(UserConnection user) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_12.EntityType.PLAYER));
+
+        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

@@ -0,0 +1,154 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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 java.util.HashMap;
+import java.util.Map;
+
+public class AdvancementTranslations {
+    private static final Map<String, String> advancements = new HashMap<>();
+
+    static {
+        add("advancements.nether.get_wither_skull.title", "Spooky Scary Skeleton");
+        add("advancements.husbandry.break_diamond_hoe.description", "Completely use up a diamond hoe, and then reevaluate your life choices");
+        add("advancements.nether.fast_travel.description", "Use the Nether to travel 7km in the Overworld");
+        add("advancements.story.enter_the_end.description", "Enter the End Portal");
+        add("advancements.story.follow_ender_eye.title", "Eye Spy");
+        add("advancements.toast.task", "Advancement Made!");
+        add("advancements.nether.find_fortress.description", "Break your way into a Nether Fortress");
+        add("advancements.story.form_obsidian.description", "Form and mine a block of Obsidian");
+        add("advancements.adventure.sniper_duel.description", "Kill a skeleton with an arrow from more than 50 meters");
+        add("advancements.end.root.description", "Or the beginning?");
+        add("advancements.adventure.kill_a_mob.title", "Monster Hunter");
+        add("advancements.end.elytra.description", "Find an Elytra");
+        add("advancements.end.dragon_breath.description", "Collect dragon's breath in a glass bottle");
+        add("advancements.story.enter_the_nether.title", "We Need to Go Deeper");
+        add("advancements.story.upgrade_tools.title", "Getting an Upgrade");
+        add("advancements.story.lava_bucket.title", "Hot Stuff");
+        add("advancements.story.shiny_gear.title", "Cover Me With Diamonds");
+        add("advancements.story.smelt_iron.description", "Smelt an iron ingot");
+        add("chat.type.advancement.goal", "%s has reached the goal %s");
+        add("advancements.husbandry.break_diamond_hoe.title", "Serious Dedication");
+        add("advancements.story.iron_tools.description", "Upgrade your pickaxe");
+        add("advancements.end.respawn_dragon.title", "The End... Again...");
+        add("advancements.husbandry.tame_an_animal.description", "Tame an animal");
+        add("advancements.end.levitate.description", "Levitate up 50 blocks from the attacks of a Shulker");
+        add("advancements.adventure.shoot_arrow.description", "Shoot something with a bow and arrow");
+        add("advancements.nether.root.description", "Bring summer clothes");
+        add("advancements.story.enchant_item.description", "Enchant an item at an Enchanting Table");
+        add("advancements.adventure.root.title", "Adventure");
+        add("advancements.adventure.trade.title", "What a Deal!");
+        add("advancements.husbandry.breed_all_animals.title", "Two by Two");
+        add("advancements.nether.find_fortress.title", "A Terrible Fortress");
+        add("advancements.nether.create_full_beacon.title", "Beaconator");
+        add("advancements.story.cure_zombie_villager.description", "Weaken and then cure a zombie villager");
+        add("advancements.toast.challenge", "Challenge Complete!");
+        add("advancements.nether.create_full_beacon.description", "Bring a beacon to full power");
+        add("advancements.story.follow_ender_eye.description", "Follow an Ender Eye");
+        add("advancements.end.find_end_city.title", "The City at the End of the Game");
+        add("chat.type.advancement.challenge", "%s has completed the challenge %s");
+        add("advancements.story.deflect_arrow.title", "Not Today, Thank You");
+        add("advancements.adventure.kill_all_mobs.description", "Kill one of every hostile monster");
+        add("advancements.story.smelt_iron.title", "Acquire Hardware");
+        add("advancements.end.levitate.title", "Great View From Up Here");
+        add("advancements.end.kill_dragon.title", "Free the End");
+        add("advancements.end.kill_dragon.description", "Good luck");
+        add("advancements.nether.brew_potion.title", "Local Brewery");
+        add("advancements.story.enchant_item.title", "Enchanter");
+        add("advancements.end.respawn_dragon.description", "Respawn the ender dragon");
+        add("advancements.nether.uneasy_alliance.title", "Uneasy Alliance");
+        add("advancements.nether.root.title", "Nether");
+        add("advancements.nether.brew_potion.description", "Brew a potion");
+        add("advancements.nether.obtain_blaze_rod.title", "Into Fire");
+        add("advancements.nether.summon_wither.title", "Withering Heights");
+        add("advancements.story.root.title", "Minecraft");
+        add("advancements.husbandry.balanced_diet.description", "Eat everything that is edible, even if it's not good for you");
+        add("advancements.nether.uneasy_alliance.description", "Rescue a Ghast from the Nether, bring it safely home to the Overworld... and then kill it.");
+        add("advancements.husbandry.breed_all_animals.description", "Breed all the animals!");
+        add("advancements.adventure.kill_all_mobs.title", "Monsters Hunted");
+        add("advancements.story.cure_zombie_villager.title", "Zombie Doctor");
+        add("advancements.husbandry.plant_seed.title", "A Seedy Place");
+        add("advancements.end.dragon_breath.title", "You Need a Mint");
+        add("advancements.story.mine_stone.title", "Stone Age");
+        add("advancements.end.find_end_city.description", "Go on in, what could happen?");
+        add("advancements.nether.create_beacon.description", "Construct and place a Beacon");
+        add("advancements.adventure.summon_iron_golem.title", "Hired Help");
+        add("advancements.end.elytra.title", "Sky's the Limit");
+        add("chat.type.advancement.task", "%s has made the advancement %s");
+        add("advancements.story.deflect_arrow.description", "Deflect an arrow with a shield");
+        add("advancements.nether.all_effects.description", "Have every effect applied at the same time");
+        add("advancements.story.enter_the_nether.description", "Build, light and enter a Nether Portal");
+        add("advancements.story.mine_diamond.title", "Diamonds!");
+        add("advancements.husbandry.balanced_diet.title", "A Balanced Diet");
+        add("advancements.husbandry.root.title", "Husbandry");
+        add("advancements.story.root.description", "The heart and story of the game");
+        add("advancements.story.upgrade_tools.description", "Construct a better pickaxe");
+        add("advancements.nether.all_effects.title", "How Did We Get Here?");
+        add("advancements.end.enter_end_gateway.title", "Remote Getaway");
+        add("advancements.story.mine_stone.description", "Mine stone with your new pickaxe");
+        add("advancements.husbandry.root.description", "The world is full of friends and food");
+        add("advancements.end.dragon_egg.title", "The Next Generation");
+        add("advancements.toast.goal", "Goal Reached!");
+        add("advancements.empty", "There doesn't seem to be anything here...");
+        add("advancements.husbandry.tame_an_animal.title", "Best Friends Forever");
+        add("advancements.end.root.title", "The End");
+        add("advancements.husbandry.breed_an_animal.title", "The Parrots and the Bats");
+        add("advancements.story.mine_diamond.description", "Acquire diamonds");
+        add("advancements.adventure.sleep_in_bed.title", "Sweet dreams");
+        add("advancements.nether.return_to_sender.title", "Return to Sender");
+        add("advancements.story.obtain_armor.title", "Suit Up");
+        add("advancements.adventure.kill_a_mob.description", "Kill any hostile monster");
+        add("advancements.nether.all_potions.description", "Have every potion effect applied at the same time");
+        add("advancements.story.iron_tools.title", "Isn't It Iron Pick");
+        add("advancements.adventure.sleep_in_bed.description", "Change your respawn point");
+        add("advancements.husbandry.plant_seed.description", "Plant a seed and watch it grow");
+        add("advancements.husbandry.breed_an_animal.description", "Breed two animals together");
+        add("advancements.adventure.shoot_arrow.title", "Take Aim");
+        add("advancements.adventure.adventuring_time.description", "Discover every biome");
+        add("advancements.adventure.adventuring_time.title", "Adventuring Time");
+        add("advancements.nether.get_wither_skull.description", "Obtain a wither skeleton's skull");
+        add("advancements.adventure.summon_iron_golem.description", "Summon an Iron Golem to help defend a village");
+        add("advancements.nether.return_to_sender.description", "Destroy a Ghast with a fireball");
+        add("advancements.adventure.trade.description", "Successfully trade with a Villager");
+        add("advancements.story.obtain_armor.description", "Protect yourself with a piece of iron armor");
+        add("advancements.adventure.root.description", "Adventure, exploration and combat");
+        add("advancements.nether.create_beacon.title", "Bring Home the Beacon");
+        add("advancements.end.dragon_egg.description", "Hold the Dragon Egg");
+        add("advancements.nether.obtain_blaze_rod.description", "Relieve a Blaze of its rod");
+        add("advancements.story.lava_bucket.description", "Fill a bucket with lava");
+        add("advancements.story.form_obsidian.title", "Ice Bucket Challenge");
+        add("advancements.story.enter_the_end.title", "The End?");
+        add("advancements.nether.fast_travel.title", "Subspace Bubble");
+        add("advancements.end.enter_end_gateway.description", "Escape the island");
+        add("advancements.adventure.totem_of_undying.title", "Postmortal");
+        add("advancements.nether.all_potions.title", "A Furious Cocktail");
+        add("advancements.adventure.sniper_duel.title", "Sniper duel");
+        add("advancements.nether.summon_wither.description", "Summon the Wither");
+        add("advancements.adventure.totem_of_undying.description", "Use a Totem of Undying to cheat death");
+        add("advancements.story.shiny_gear.description", "Diamond armor saves lives");
+    }
+
+    private static void add(String key, String value) {
+        advancements.put(key, value);
+    }
+
+    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) 2016-2024 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) 2016-2024 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) 2016-2024 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 +1,124 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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;
+import com.viaversion.viaversion.util.Key;
+
+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());
+
+        try {
+            wrapper.write(Type.COMPONENT, Protocol1_9To1_8.STRING_TO_JSON.transform(wrapper, generateString()));
+        } catch (final Exception e) {
+            throw new RuntimeException(e);
+        }
+        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) {
+        current = Key.stripMinecraftNamespace(current);
+
+        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 +1,282 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
+import com.viaversion.viaversion.api.minecraft.ClientWorld;
+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.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_9_3;
+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_3to1_9_1_2.ServerboundPackets1_9_3;
+import java.util.Iterator;
+import java.util.Map;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+public class BlockItemPackets1_12 extends LegacyBlockItemRewriter<ClientboundPackets1_12, ServerboundPackets1_9_3, Protocol1_11_1To1_12> {
+
+    public BlockItemPackets1_12(Protocol1_11_1To1_12 protocol) {
+        super(protocol, "1.12");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerBlockChange(ClientboundPackets1_12.BLOCK_CHANGE);
+        registerMultiBlockChange(ClientboundPackets1_12.MULTI_BLOCK_CHANGE);
+
+        protocol.registerClientbound(ClientboundPackets1_12.MAP_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT);
+                map(Type.BYTE);
+                map(Type.BOOLEAN);
+                handler(wrapper -> {
+                    int count = wrapper.passthrough(Type.VAR_INT);
+                    for (int i = 0; i < count * 3; i++) {
+                        wrapper.passthrough(Type.BYTE);
+                    }
+                });
+                handler(wrapper -> {
+                    short columns = wrapper.passthrough(Type.UNSIGNED_BYTE);
+                    if (columns <= 0) return;
+
+                    wrapper.passthrough(Type.UNSIGNED_BYTE); // Rows
+                    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);
+        registerWindowItems(ClientboundPackets1_12.WINDOW_ITEMS);
+        registerEntityEquipment(ClientboundPackets1_12.ENTITY_EQUIPMENT);
+
+        // Plugin message Packet -> Trading
+        protocol.registerClientbound(ClientboundPackets1_12.PLUGIN_MESSAGE, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(wrapper -> {
+                    if (wrapper.get(Type.STRING, 0).equals("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.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Input Item
+                            wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Output Item
+
+                            boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                            if (secondItem)
+                                wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // 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 PacketHandlers() {
+            @Override
+            public void register() {
+                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.ITEM1_8); // 5 - Clicked Item
+
+                handler(wrapper -> {
+                    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.ITEM1_8, 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.ITEM1_8, 0);
+                    handleItemToServer(wrapper.user(), item);
+                });
+            }
+        });
+
+        registerCreativeInvAction(ServerboundPackets1_9_3.CREATIVE_INVENTORY_ACTION);
+
+        protocol.registerClientbound(ClientboundPackets1_12.CHUNK_DATA, wrapper -> {
+            ClientWorld clientWorld = wrapper.user().get(ClientWorld.class);
+
+            ChunkType1_9_3 type = ChunkType1_9_3.forEnvironment(clientWorld.getEnvironment()); // Use the 1.9.4 Chunk type since nothing changed.
+            Chunk chunk = wrapper.passthrough(type);
+
+            handleChunk(chunk);
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.BLOCK_ENTITY_DATA, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.POSITION1_8); // 0 - Position
+                map(Type.UNSIGNED_BYTE); // 1 - Action
+                map(Type.NAMED_COMPOUND_TAG); // 2 - NBT
+
+                handler(wrapper -> {
+                    // 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.ITEM1_8)) // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+        });
+
+        protocol.registerServerbound(ServerboundPackets1_9_3.CLIENT_STATUS, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // Action ID
+
+                handler(wrapper -> {
+                    // Open Inventory
+                    if (wrapper.get(Type.VAR_INT, 0) == 2) {
+                        wrapper.cancel();
+                    }
+                });
+            }
+        });
+    }
+
+    @Override
+    public @Nullable Item handleItemToClient(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, 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(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, 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.getCompoundTag(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/ChatPackets1_12.java

@@ -0,0 +1,71 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.connection.UserConnection;
+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> {
+
+    public static final ComponentRewriter<ClientboundPackets1_12> COMPONENT_REWRITER = new ComponentRewriter<ClientboundPackets1_12>(null, ComponentRewriter.ReadType.JSON) {
+        @Override
+        public void processText(UserConnection connection, JsonElement element) {
+            super.processText(connection, element);
+            if (element == null || !element.isJsonObject()) {
+                return;
+            }
+
+            JsonObject object = element.getAsJsonObject();
+            JsonElement keybind = object.remove("keybind");
+            if (keybind == null) {
+                return;
+            }
+
+            //TODO Add nicer text for the key, also use this component rewriter in more packets
+            object.addProperty("text", keybind.getAsString());
+        }
+
+        @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, wrapper -> {
+            JsonElement element = wrapper.passthrough(Type.COMPONENT);
+            COMPONENT_REWRITER.processText(wrapper.user(), element);
+        });
+    }
+}

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

@@ -0,0 +1,296 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.viaversion.api.data.entity.StoredEntityData;
+import com.viaversion.viaversion.api.minecraft.entities.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_12;
+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.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+import com.viaversion.viaversion.api.type.types.version.Types1_12;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.protocols.protocol1_12to1_11_1.ClientboundPackets1_12;
+import com.viaversion.viaversion.protocols.protocol1_9_3to1_9_1_2.ClientboundPackets1_9_3;
+
+public class EntityPackets1_12 extends LegacyEntityRewriter<ClientboundPackets1_12, 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 PacketHandlers() {
+            @Override
+            public void register() {
+                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 -> EntityTypes1_12.ObjectType.findById(id).orElse(null)));
+
+                handler(protocol.getItemRewriter().getFallingBlockHandler());
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.SPAWN_EXPERIENCE_ORB, EntityTypes1_12.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_12.SPAWN_GLOBAL_ENTITY, EntityTypes1_12.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_12.SPAWN_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(getMobSpawnRewriter1_11(Types1_12.METADATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_12.SPAWN_PAINTING, EntityTypes1_12.EntityType.PAINTING);
+
+        protocol.registerClientbound(ClientboundPackets1_12.SPAWN_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                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, EntityTypes1_12.EntityType.PLAYER));
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.JOIN_GAME, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.INT); // 0 - Entity ID
+                map(Type.UNSIGNED_BYTE); // 1 - Gamemode
+                map(Type.INT); // 2 - Dimension
+
+                handler(getTrackerHandler(EntityTypes1_12.EntityType.PLAYER, Type.INT));
+
+                handler(getDimensionHandler(1));
+
+                handler(wrapper -> {
+                    ShoulderTracker tracker = wrapper.user().get(ShoulderTracker.class);
+                    tracker.setEntityId(wrapper.get(Type.INT, 0));
+                });
+
+                // Send fake inventory achievement
+                handler(packetWrapper -> {
+                    PacketWrapper wrapper = PacketWrapper.create(ClientboundPackets1_9_3.STATISTICS, 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 PacketHandlers() {
+            @Override
+            public void register() {
+                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(EntityTypes1_12.EntityType.PARROT, EntityTypes1_12.EntityType.BAT).plainName().spawnMetadata(storage -> storage.add(new Metadata(12, MetaType1_12.Byte, (byte) 0x00)));
+        mapEntityTypeWithData(EntityTypes1_12.EntityType.ILLUSION_ILLAGER, EntityTypes1_12.EntityType.EVOCATION_ILLAGER).plainName();
+
+        filter().handler((event, meta) -> {
+            if (meta.metaType() == MetaType1_12.Chat) {
+                ChatPackets1_12.COMPONENT_REWRITER.processText(event.user(), (JsonElement) meta.getValue());
+            }
+        });
+
+        // Handle Illager
+        filter().type(EntityTypes1_12.EntityType.EVOCATION_ILLAGER).cancel(12);
+        filter().type(EntityTypes1_12.EntityType.EVOCATION_ILLAGER).index(13).toIndex(12);
+
+        filter().type(EntityTypes1_12.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().type(EntityTypes1_12.EntityType.PARROT).handler((event, meta) -> {
+            StoredEntityData data = storedEntityData(event);
+            if (!data.has(ParrotStorage.class)) {
+                data.put(new ParrotStorage());
+            }
+        });
+        // Parrot remove animal metadata
+        filter().type(EntityTypes1_12.EntityType.PARROT).cancel(12); // Is baby
+        filter().type(EntityTypes1_12.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(EntityTypes1_12.EntityType.PARROT).cancel(14); // Owner
+        filter().type(EntityTypes1_12.EntityType.PARROT).cancel(15); // Variant
+
+        // Left shoulder entity data
+        filter().type(EntityTypes1_12.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.getStringTag("id") != null && event.entityId() == tracker.getEntityId()) {
+                String id = tag.getStringTag("id").getValue();
+                if (tracker.getLeftShoulder() == null || !tracker.getLeftShoulder().equals(id)) {
+                    tracker.setLeftShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+
+        // Right shoulder entity data
+        filter().type(EntityTypes1_12.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.getStringTag("id") != null && event.entityId() == tracker.getEntityId()) {
+                String id = tag.getStringTag("id").getValue();
+                if (tracker.getRightShoulder() == null || !tracker.getRightShoulder().equals(id)) {
+                    tracker.setRightShoulder(id);
+                    tracker.update();
+                }
+            }
+
+            event.cancel();
+        });
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_12.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_12.getTypeFromId(typeId, true);
+    }
+}

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

@@ -0,0 +1,150 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.LegacySoundRewriter;
+import com.viaversion.viabackwards.protocol.protocol1_11_1to1_12.Protocol1_11_1To1_12;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+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);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocol.registerClientbound(ClientboundPackets1_12.NAMED_SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.STRING); // 0 - Sound name
+                map(Type.VAR_INT); // 1 - Sound Category
+                map(Type.INT); // 2 - x
+                map(Type.INT); // 3 - y
+                map(Type.INT); // 4 - z
+                map(Type.FLOAT); // 5 - Volume
+                map(Type.FLOAT); // 6 - Pitch
+            }
+        });
+
+        protocol.registerClientbound(ClientboundPackets1_12.SOUND, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.VAR_INT); // 0 - Sound name
+                map(Type.VAR_INT); // 1 - Sound Category
+                map(Type.INT); // 2 - x
+                map(Type.INT); // 3 - y
+                map(Type.INT); // 4 - z
+                map(Type.FLOAT); // 5 - Volume
+                map(Type.FLOAT); // 6 - Pitch
+
+                handler(wrapper -> {
+                    int oldId = wrapper.get(Type.VAR_INT, 0);
+                    int newId = handleSounds(oldId);
+                    if (newId == -1) {
+                        wrapper.cancel();
+                        return;
+                    }
+
+                    if (hasPitch(oldId)) {
+                        wrapper.set(Type.FLOAT, 1, handlePitch(oldId));
+                    }
+                    wrapper.set(Type.VAR_INT, 0, newId);
+                });
+            }
+        });
+    }
+
+
+    @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
+        added(27, -1); // block.end_portal_frame.fill
+
+        added(72, 70); // block.note.bell -> block.note.harp
+        added(73, 70); // block.note.chime -> block.note.harp
+        added(74, 70); // block.note.flute -> block.note.harp
+        added(75, 70); // block.note.guitar -> block.note.harp
+        added(80, 70); // block.note.xylophone -> block.note.harp
+
+        added(150, -1); // entity.boat.paddle_land
+        added(151, -1); // entity.boat.paddle_water
+
+        added(152, -1); // entity.bobber.retrieve
+
+        added(195, -1); // entity.endereye.death
+
+        added(274, 198, 0.8f); // entity.illusion_illager.ambient -> entity.evocation_illager.ambient
+        added(275, 199, 0.8f); // entity.illusion_illager.cast_spell -> entity.evocation_illager.cast_spell
+        added(276, 200, 0.8f); // entity.illusion_illager.death -> entity.evocation_illager.death
+        added(277, 201, 0.8f); // entity.illusion_illager.hurt -> entity.evocation_illager.hurt
+        added(278, 191, 0.9f); // entity.illusion_illager.mirror_move -> entity.endermen.teleport
+        added(279, 203, 1.5f); // entity.illusion_illager.prepare_blindness -> entity.evocation_illager.prepare_summon
+        added(280, 202, 0.8f); // entity.illusion_illager.prepare_mirror -> entity.evocation_illager.prepare_attack
+
+        added(319, 133, 0.6f); // entity.parrot.ambient -> entity.bat.ambient
+        added(320, 134, 1.7f); // entity.parrot.death -> entity.bat.death
+        added(321, 219, 1.5f); // entity.parrot.eat -> entity.generic.eat
+        added(322, 136, 0.7f); // entity.parrot.fly -> entity.bat.loop
+        added(323, 135, 1.6f); // entity.parrot.hurt -> entity.bat.hurt
+        added(324, 138, 1.5f); // entity.parrot.imitate.blaze -> entity.blaze.ambient
+        added(325, 163, 1.5f); // entity.parrot.imitate.creeper -> entity.creeper.primed
+        added(326, 170, 1.5f); // entity.parrot.imitate.elder_guardian -> entity.elder_guardian.ambient
+        added(327, 178, 1.5f); // entity.parrot.imitate.enderdragon -> entity.enderdragon.ambient
+        added(328, 186, 1.5f); // entity.parrot.imitate.enderman -> entity.endermen.ambient
+        added(329, 192, 1.5f); // entity.parrot.imitate.endermite -> entity.endermite.ambient
+        added(330, 198, 1.5f); // entity.parrot.imitate.evocation_illager -> entity.evocation_illager.ambient
+        added(331, 226, 1.5f); // entity.parrot.imitate.ghast -> entity.ghast.ambient
+        added(332, 259, 1.5f); // entity.parrot.imitate.husk -> entity.husk.ambient
+        added(333, 198, 1.3f); // entity.parrot.imitate.illusion_illager -> entity.evocation_illager.ambient
+        added(334, 291, 1.5f); // entity.parrot.imitate.magmacube -> entity.magmacube.squish
+        added(335, 321, 1.5f); // entity.parrot.imitate.polar_bear -> entity.polar_bear.ambient
+        added(336, 337, 1.5f); // entity.parrot.imitate.shulker -> entity.shulker.ambient
+        added(337, 347, 1.5f); // entity.parrot.imitate.silverfish -> entity.silverfish.ambient
+        added(338, 351, 1.5f); // entity.parrot.imitate.skeleton -> entity.skeleton.ambient
+        added(339, 363, 1.5f); // entity.parrot.imitate.slime -> entity.slime.squish
+        added(340, 376, 1.5f); // entity.parrot.imitate.spider -> entity.spider.ambient
+        added(341, 385, 1.5f); // entity.parrot.imitate.stray -> entity.stray.ambient
+        added(342, 390, 1.5f); // entity.parrot.imitate.vex -> entity.vex.ambient
+        added(343, 400, 1.5f); // entity.parrot.imitate.vindication_illager -> entity.vindication_illager.ambient
+        added(344, 403, 1.5f); // entity.parrot.imitate.witch -> entity.witch.ambient
+        added(345, 408, 1.5f); // entity.parrot.imitate.wither -> entity.wither.ambient
+        added(346, 414, 1.5f); // entity.parrot.imitate.wither_skeleton -> entity.wither_skeleton.ambient
+        added(347, 418, 1.5f); // entity.parrot.imitate.wolf -> entity.wolf.ambient
+        added(348, 427, 1.5f); // entity.parrot.imitate.zombie -> entity.zombie.ambient
+        added(349, 438, 1.5f); // entity.parrot.imitate.zombie_pigman -> entity.zombie_pig.ambient
+        added(350, 442, 1.5f); // entity.parrot.imitate.zombie_villager -> entity.zombie_villager.ambient
+        added(351, 155); // entity.parrot.step -> entity.chicken.step
+
+        added(368, 316); // entity.player.hurt_drown -> entity.player.hurt
+        added(369, 316); // entity.player.hurt_on_fire -> entity.player.hurt
+
+        // No replacement sounds for these, since it could be confusing, the toast doesn't show up
+        added(544, -1); // ui.toast.in
+        added(545, -1); // ui.toast.out
+        added(546, 317, 1.5f); // ui.toast.challenge_complete
+    }
+}

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

@@ -0,0 +1,64 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+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;
+
+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 ItemPackets1_11_1 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) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_11.EntityType.PLAYER));
+    }
+
+    @Override
+    public EntityPackets1_11_1 getEntityRewriter() {
+        return entityPackets;
+    }
+
+    @Override
+    public ItemPackets1_11_1 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) 2016-2024 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.EntityType;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_11;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+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<ClientboundPackets1_9_3, 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 PacketHandlers() {
+            @Override
+            public void register() {
+                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 -> EntityTypes1_11.ObjectType.findById(id).orElse(null)));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_EXPERIENCE_ORB, EntityTypes1_11.EntityType.EXPERIENCE_ORB);
+        registerTracker(ClientboundPackets1_9_3.SPAWN_GLOBAL_ENTITY, EntityTypes1_11.EntityType.WEATHER);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_MOB, new PacketHandlers() {
+            @Override
+            public void register() {
+                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(getMobSpawnRewriter1_11(Types1_9.METADATA_LIST));
+            }
+        });
+
+        registerTracker(ClientboundPackets1_9_3.SPAWN_PAINTING, EntityTypes1_11.EntityType.PAINTING);
+        registerJoinGame(ClientboundPackets1_9_3.JOIN_GAME, EntityTypes1_11.EntityType.PLAYER);
+        registerRespawn(ClientboundPackets1_9_3.RESPAWN);
+
+        protocol.registerClientbound(ClientboundPackets1_9_3.SPAWN_PLAYER, new PacketHandlers() {
+            @Override
+            public void register() {
+                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, EntityTypes1_11.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(EntityTypes1_11.EntityType.FIREWORK).cancel(7);
+
+        // Handle non-existing pig metadata (index 14 - boost time)
+        filter().type(EntityTypes1_11.EntityType.PIG).cancel(14);
+    }
+
+    @Override
+    public EntityType typeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, false);
+    }
+
+    @Override
+    public EntityType objectTypeFromId(int typeId) {
+        return EntityTypes1_11.getTypeFromId(typeId, true);
+    }
+}

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

@@ -0,0 +1,108 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.connection.UserConnection;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+import com.viaversion.viaversion.api.type.Type;
+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<ClientboundPackets1_9_3, ServerboundPackets1_9_3, Protocol1_11To1_11_1> {
+
+    private LegacyEnchantmentRewriter enchantmentRewriter;
+
+    public ItemPackets1_11_1(Protocol1_11To1_11_1 protocol) {
+        super(protocol, "1.11.1");
+    }
+
+    @Override
+    protected void registerPackets() {
+        registerSetSlot(ClientboundPackets1_9_3.SET_SLOT);
+        registerWindowItems(ClientboundPackets1_9_3.WINDOW_ITEMS);
+        registerEntityEquipment(ClientboundPackets1_9_3.ENTITY_EQUIPMENT);
+
+        // Plugin message Packet -> Trading
+        protocol.registerClientbound(ClientboundPackets1_9_3.PLUGIN_MESSAGE, new PacketHandlers() {
+            @Override
+            public void register() {
+                map(Type.STRING); // 0 - Channel
+
+                handler(wrapper -> {
+                    if (wrapper.get(Type.STRING, 0).equals("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.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Input Item
+                            wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // Output Item
+
+                            boolean secondItem = wrapper.passthrough(Type.BOOLEAN); // Has second item
+                            if (secondItem) {
+                                wrapper.write(Type.ITEM1_8, handleItemToClient(wrapper.user(), wrapper.read(Type.ITEM1_8))); // 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);
+        registerCreativeInvAction(ServerboundPackets1_9_3.CREATIVE_INVENTORY_ACTION);
+
+        // Handle item metadata
+        protocol.getEntityRewriter().filter().handler((event, meta) -> {
+            if (meta.metaType().type().equals(Type.ITEM1_8)) { // Is Item
+                meta.setValue(handleItemToClient(event.user(), (Item) meta.getValue()));
+            }
+        });
+    }
+
+    @Override
+    protected void registerRewrites() {
+        enchantmentRewriter = new LegacyEnchantmentRewriter(nbtTagName());
+        enchantmentRewriter.registerEnchantment(22, "§7Sweeping Edge");
+    }
+
+    @Override
+    public Item handleItemToClient(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToClient(connection, item);
+
+        enchantmentRewriter.handleToClient(item);
+        return item;
+    }
+
+    @Override
+    public Item handleItemToServer(UserConnection connection, Item item) {
+        if (item == null) return null;
+        super.handleItemToServer(connection, item);
+
+        enchantmentRewriter.handleToServer(item);
+        return item;
+    }
+}

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

@@ -0,0 +1,70 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.viabackwards.protocol.protocol1_12_1to1_12_2.storage.KeepAliveTracker;
+import com.viaversion.viaversion.api.connection.UserConnection;
+import com.viaversion.viaversion.api.protocol.remapper.PacketHandlers;
+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 PacketHandlers() {
+            @Override
+            public void register() {
+                handler(packetWrapper -> {
+                    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 PacketHandlers() {
+            @Override
+            public void register() {
+                handler(packetWrapper -> {
+                    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_1to1_12_2/storage/KeepAliveTracker.java

@@ -0,0 +1,38 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.storage;
+
+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_2to1_13/Protocol1_12_2To1_13.java

@@ -0,0 +1,172 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.NoteBlockStorage;
+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.ClientWorld;
+import com.viaversion.viaversion.api.minecraft.entities.EntityTypes1_13;
+import com.viaversion.viaversion.data.entity.EntityTrackerBase;
+import com.viaversion.viaversion.libs.gson.JsonElement;
+import com.viaversion.viaversion.libs.gson.JsonObject;
+import com.viaversion.viaversion.libs.gson.JsonParser;
+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.rewriter.ComponentRewriter;
+import com.viaversion.viaversion.util.ComponentUtil;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+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 EntityPackets1_13 entityRewriter = new EntityPackets1_13(this);
+    private final BlockItemPackets1_13 blockItemPackets = new BlockItemPackets1_13(this);
+    private final TranslatableRewriter<ClientboundPackets1_13> translatableRewriter = new TranslatableRewriter<ClientboundPackets1_13>(this, ComponentRewriter.ReadType.JSON) {
+        @Override
+        protected void handleTranslate(JsonObject root, String translate) {
+            String mappedKey = mappedTranslationKey(translate);
+            if (mappedKey != null || (mappedKey = getMappingData().getTranslateMappings().get(translate)) != null) {
+                root.addProperty("translate", mappedKey);
+            }
+        }
+    };
+    private final TranslatableRewriter<ClientboundPackets1_13> translatableToLegacyRewriter = new TranslatableRewriter<ClientboundPackets1_13>(this, ComponentRewriter.ReadType.JSON) {
+        @Override
+        protected void handleTranslate(JsonObject root, String translate) {
+            String mappedKey = mappedTranslationKey(translate);
+            if (mappedKey != null || (mappedKey = getMappingData().getTranslateMappings().get(translate)) != null) {
+                root.addProperty("translate", Protocol1_13To1_12_2.MAPPINGS.getMojangTranslation().getOrDefault(mappedKey, mappedKey));
+            }
+        }
+    };
+
+    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.registerPing();
+        translatableRewriter.registerBossBar(ClientboundPackets1_13.BOSSBAR);
+        translatableRewriter.registerComponentPacket(ClientboundPackets1_13.CHAT_MESSAGE);
+        translatableRewriter.registerLegacyOpenWindow(ClientboundPackets1_13.OPEN_WINDOW);
+        translatableRewriter.registerComponentPacket(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) {
+        if (!user.has(ClientWorld.class)) {
+            user.put(new ClientWorld());
+        }
+
+        user.addEntityTracker(this.getClass(), new EntityTrackerBase(user, EntityTypes1_13.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());
+        }
+
+        user.put(new NoteBlockStorage());
+    }
+
+    @Override
+    public BackwardsMappings getMappingData() {
+        return MAPPINGS;
+    }
+
+    @Override
+    public EntityPackets1_13 getEntityRewriter() {
+        return entityRewriter;
+    }
+
+    @Override
+    public BlockItemPackets1_13 getItemRewriter() {
+        return blockItemPackets;
+    }
+
+    // Don't override the parent method
+    public TranslatableRewriter<ClientboundPackets1_13> translatableRewriter() {
+        return translatableRewriter;
+    }
+
+    public String jsonToLegacy(UserConnection connection, String value) {
+        if (value.isEmpty()) {
+            return "";
+        }
+
+        try {
+            return jsonToLegacy(connection, JsonParser.parseString(value));
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return "";
+    }
+
+    public String jsonToLegacy(UserConnection connection, @Nullable JsonElement value) {
+        if (value == null || value.isJsonNull()) {
+            return "";
+        }
+
+        translatableToLegacyRewriter.processText(connection, value);
+        return ComponentUtil.jsonToLegacy(value);
+    }
+}

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

@@ -0,0 +1,61 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.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.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(int blockId, CompoundTag tag) {
+        // Normal banners
+        if (blockId >= BANNER_START && blockId <= BANNER_STOP) {
+            int color = (blockId - BANNER_START) >> 4;
+            tag.putInt("Base", 15 - color);
+        }
+        // Wall banners
+        else if (blockId >= WALL_BANNER_START && blockId <= WALL_BANNER_STOP) {
+            int color = (blockId - WALL_BANNER_START) >> 2;
+            tag.putInt("Base", 15 - color);
+        } else {
+            ViaBackwards.getPlatform().getLogger().warning("Why does this block have the banner block entity? :(" + tag);
+        }
+
+        // Invert colors
+        ListTag<CompoundTag> patternsTag = tag.getListTag("Patterns", CompoundTag.class);
+        if (patternsTag != null) {
+            for (CompoundTag pattern : patternsTag) {
+                NumberTag colorTag = pattern.getNumberTag("Color");
+                pattern.putInt("Color", 15 - colorTag.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 +1,35 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.libs.opennbt.tag.builtin.CompoundTag;
+
+public class BedHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        int offset = blockId - 748;
+        int color = offset >> 4;
+
+        tag.putInt("color", color);
+
+        return tag;
+    }
+}

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

@@ -0,0 +1,81 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.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.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(int blockId, CompoundTag tag) {
+        Pair<String, Byte> item = getOrDefault(blockId);
+
+        tag.putString("Item", item.key());
+        tag.putInt("Data", item.value());
+
+        return tag;
+    }
+
+}

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

@@ -0,0 +1,112 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.data.MappingDataLoader;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntMap;
+import com.viaversion.viaversion.libs.fastutil.objects.Object2IntOpenHashMap;
+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_13to1_12_2.blockconnections.ConnectionData;
+import java.util.Map;
+import java.util.StringJoiner;
+
+public class PistonHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    private final Object2IntMap<String> pistonIds = new Object2IntOpenHashMap<>();
+
+    public PistonHandler() {
+        pistonIds.defaultReturnValue(-1);
+        if (Via.getConfig().isServersideBlockConnections()) {
+            Map<String, Integer> keyToId = ConnectionData.getKeyToId();
+            for (Map.Entry<String, Integer> entry : keyToId.entrySet()) {
+                if (!entry.getKey().contains("piston")) {
+                    continue;
+                }
+
+                addEntries(entry.getKey(), entry.getValue());
+            }
+        } else {
+            ListTag<StringTag> blockStates = MappingDataLoader.INSTANCE.loadNBT("blockstates-1.13.nbt").getListTag("blockstates", StringTag.class);
+            for (int id = 0; id < blockStates.size(); id++) {
+                StringTag state = blockStates.get(id);
+                String key = state.getValue();
+                if (!key.contains("piston")) {
+                    continue;
+                }
+
+                addEntries(key, id);
+            }
+        }
+    }
+
+    // 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(int blockId, CompoundTag tag) {
+        CompoundTag blockState = tag.getCompoundTag("blockState");
+        if (blockState == null) return tag;
+
+        String dataFromTag = getDataFromTag(blockState);
+        if (dataFromTag == null) return tag;
+
+        int id = pistonIds.getInt(dataFromTag);
+        if (id == -1) {
+            //TODO see why this could be null and if this is bad
+            return tag;
+        }
+
+        tag.putInt("blockId", id >> 4);
+        tag.putInt("blockData", 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.getStringTag("Name");
+        if (name == null) return null;
+
+        CompoundTag properties = tag.getCompoundTag("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 +1,46 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.libs.opennbt.tag.builtin.CompoundTag;
+
+public class SkullHandler implements BackwardsBlockEntityHandler {
+    private static final int SKULL_START = 5447;
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        int diff = blockId - SKULL_START;
+        int pos = diff % 20;
+        byte type = (byte) Math.floor(diff / 20f);
+
+        // Set type
+        tag.putByte("SkullType", type);
+
+        // Remove wall skulls
+        if (pos < 4) {
+            return tag;
+        }
+
+        // Add rotation for normal skulls
+        tag.putByte("Rot", (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 +1,39 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.libs.opennbt.tag.builtin.CompoundTag;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.StringTag;
+
+public class SpawnerHandler implements BackwardsBlockEntityProvider.BackwardsBlockEntityHandler {
+
+    @Override
+    public CompoundTag transform(int blockId, CompoundTag tag) {
+        CompoundTag dataTag = tag.getCompoundTag("SpawnData");
+        if (dataTag != null) {
+            StringTag idTag = dataTag.getStringTag("id");
+            if (idTag != null) {
+                idTag.setValue(EntityNameRewrites.rewrite(idTag.getValue()));
+            }
+        }
+        return tag;
+    }
+}

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

@@ -0,0 +1,94 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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;
+import com.viaversion.viaversion.libs.opennbt.tag.builtin.CompoundTag;
+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 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<>();
+
+    public BackwardsMappings() {
+        super("1.13", "1.12", Protocol1_13To1_12_2.class);
+    }
+
+    @Override
+    public void loadExtras(final CompoundTag data) {
+        super.loadExtras(data);
+
+        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());
+        }
+    }
+
+    @Override
+    public int getNewBlockStateId(int id) {
+        // Comparator funkyness: https://github.com/ViaVersion/ViaBackwards/issues/524
+        if (id >= 5635 && id <= 5650) {
+            if (id < 5639) {
+                id += 4;
+            } else if (id < 5643) {
+                id -= 4;
+            } else if (id < 5647) {
+                id += 4;
+            } else {
+                id -= 4;
+            }
+        }
+
+        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;
+    }
+
+    public Int2ObjectMap<String> getStatisticMappings() {
+        return statisticMappings;
+    }
+
+    public Map<String, String> getTranslateMappings() {
+        return translateMappings;
+    }
+}

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

@@ -0,0 +1,56 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.util.Key;
+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(Key.namespaced(future), Key.namespaced(past));
+    }
+
+    public static String rewrite(String entName) {
+        String entityName = ENTITY_NAMES.get(Key.namespaced(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 +1,45 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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 +1,43 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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 com.viaversion.viaversion.util.Key;
+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) {
+        return SOUNDS.get(Key.stripMinecraftNamespace(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) 2016-2024 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 +1,203 @@
+/*
+ * This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
+ * Copyright (C) 2016-2024 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.Particle;
+import com.viaversion.viaversion.api.minecraft.item.Item;
+import com.viaversion.viaversion.api.protocol.packet.PacketWrapper;
+import com.viaversion.viaversion.api.type.Type;
+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.ITEM1_13));
+                }
+
+                @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(null, 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;
+        }
+    }
+}