Bump the version to avoid bad downloads.

* Possibility  to send the Supported versions inside the status response packet

* Make lowercase

.gitignore

@@ -1,3 +1,116 @@
-target/
-.idea/
+### Java files ###
+*.class
+
+# Package Files
+#*.jar
+*.war
+*.ear
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm
+# Ignore project files
 *.iml
+
+# Ignore IDEA directory
+.idea/*
+
+# Include the project's code style settings file
+!.idea/codeStyleSettings.xml
+
+# Include the project's dictionary
+!.idea/dictionaries/
+!.idea/dictionaries/*
+
+# File-based project format:
+*.ipr
+*.iws
+
+### Plugin-specific files: ###
+# IntelliJ
+/out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+
+
+
+### 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/
+
+
+
+### Git ###
+# Don't exclude the .gitignore itself
+!.gitignore

.travis.yml

@@ -0,0 +1,12 @@
+sudo: false
+
+language: java
+jdk: oraclejdk7
+
+cache:
+  directories:
+    - '$HOME/.m2/repository'
+
+script:
+  - mvn dependency:purge-local-repository -DactTransitively=false -DreResolve=false
+  - mvn clean install -B -U

ISSUE_TEMPLATE.md

@@ -0,0 +1,12 @@
+### 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
+
+### Are you using any additional software like BungeeCord? If so, what software and version? (Please list your plugins as well)
+
+### How does this error happen? login? Using an item? 
+
+### Is there an error in the console? Use pastebin.com. Is there a kick message?
+

LICENSE

@@ -0,0 +1,24 @@
+License:
+--------
+
+MIT License
+
+Copyright (c) 2016
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -1,42 +1,71 @@
-# ViaVersion 0.3.2
-**Allows the connection of 1.8 clients to 1.9**
+# ViaVersion 0.8.4
+[![Build Status](https://travis-ci.org/MylesIsCool/ViaVersion.svg?branch=master)](https://travis-ci.org/MylesIsCool/ViaVersion)
+[![Gitter](https://badges.gitter.im/MylesIsCool/ViaVersion.svg)](https://gitter.im/MylesIsCool/ViaVersion)
 
-This plugin modifies netty to allow connection of 1.9 clients to 1.8,
+## This is an experimental branch for 1.10, we do not recommend you to use this on a production server
+**Direct download link:** [Latest builds](https://ci.viaversion.com/job/ViaVersion%201.10%20DEV/)
 
-**Don't use late bind nor ProtocolLib**
+**Allows the connection of 1.9 clients to 1.8**
+**1.10 clients on 1.8 / 1.9 servers**
 
-**As of this point it doesn't have everything, I need to fix:**
+This took 100s hours of work, so if you enjoy this consider looking into contacting me and supporting my projects.
 
-Attempt to make boats nicer when they don't work
-
-Remap spawn eggs
-
-If you have a bug with entities, please report the full stack trace
-
-Some items with JSON data cause crashing due to the change in how strict minecraft is.
+**Contributor Chat:** https://gitter.im/MylesIsCool/ViaVersion
 
 
-
-This took hours of work, so if you enjoy this consider looking into contacting me and supporting my projects.
-
-
-Credits:
+Sources:
 --------
 
 **wiki.vg** (Protocol info, though I did have to find a lot myself)
 
-**MCProtocolLib** (used for chunk reading & some of writing.)
+**Burger** We use this tool to get protocol and other useful information for new / undocumented Minecraft versions
+
+**OpenNBT** (used for slot rewriting)
+
+
+
+Contributors:
+--------
 
 **Myself** (harhar)
 
-**Matsv** (Movement Fix / Correcting my stupidity)
+**Matsv/StamBoom**
 
-**HugoDaBosss** (Sounds fix)
+**HugoDaBosss**
+
+**SanderGielisse**
+
+**Paulomart**
+
+**gigosaurus**
+
+**fillefilip8**
+
+**lenis0012**
+
+
+
+Releases / Dev Builds:
+--------
+You can find official releases here:
+
+https://www.spigotmc.org/resources/viaversion.19254/history
+
+
+----------
+
+You can find official dev builds here:
+
+**Jenkins:** https://ci.viaversion.com
+
+**JavaDocs:** https://jd.viaversion.com
+
+**Maven Repo:** https://repo.viaversion.com
 
 License:
 --------
 
-You may modify this work, all rights are still owned by myself excluding any files in the spacebase package as they belong to the respected contributors. Please credit the original author (myself) when forking etc. (or if it helped you understand the new protocol or netty!)
+MIT License, see LICENSE for more details.
 
+Thanks!
 
-Thanks!

circle.yml

@@ -0,0 +1,11 @@
+machine:
+  java:
+    version: oraclejdk7
+general:
+  artifacts:
+    - "target/*.jar"
+test:
+  override:
+    - mvn clean install -B
+  post:
+    - cp ./target/*.jar $CIRCLE_ARTIFACTS

pom.xml

@@ -1,54 +1,223 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>us.myles</groupId>
-    <artifactId>ViaVersion</artifactId>
-    <version>1.0-SNAPSHOT</version>
+    <artifactId>viaversion</artifactId>
+    <version>0.9.1</version>
+    <packaging>jar</packaging>
+
+    <name>ViaVersion</name>
+    <description>Allow 1.8 clients to join 1.9 bukkit servers!</description>
+    <inceptionYear>2016</inceptionYear>
+    <url>https://www.spigotmc.org/resources/viaversion.19254/</url>
+
+    <prerequisites>
+        <maven>3.3.3</maven>
+    </prerequisites>
+
+    <properties>
+        <!-- Project Properties -->
+        <projectEncoding>UTF-8</projectEncoding>
+        <project.build.sourceEncoding>${projectEncoding}</project.build.sourceEncoding>
+        <project.build.outputEncoding>${projectEncoding}</project.build.outputEncoding>
+        <jdkVersion>1.7</jdkVersion>
+        <!-- <testJreVersion>1.7</testJreVersion> -->
+
+        <!-- Change Bukkit Version HERE! -->
+        <bukkitVersion>1.8.8-R0.1-SNAPSHOT</bukkitVersion>
+    </properties>
+
     <build>
+        <finalName>${project.name}-${project.version}</finalName>
+        <sourceDirectory>src/main/java</sourceDirectory>
+        <defaultGoal>clean install</defaultGoal>
+        <!-- <testSourceDirectory>src/test/java</testSourceDirectory> -->
+
+        <resources>
+            <resource>
+                <targetPath>.</targetPath>
+                <filtering>false</filtering>
+                <directory>.</directory>
+                <includes>
+                    <include>LICENSE</include>
+                </includes>
+            </resource>
+            <resource>
+                <targetPath>.</targetPath>
+                <filtering>true</filtering>
+                <directory>src/main/resources/</directory>
+                <includes>
+                    <include>*</include>
+                </includes>
+            </resource>
+        </resources>
+        <!--
+        <testResources>
+            <testResource>
+                <directory>src/test/resources</directory>
+            </testResource>
+        </testResources>
+        -->
+
         <plugins>
+            <!-- Maven Java Compiler -->
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
                 <configuration>
-                    <source>1.7</source>
-                    <target>1.7</target>
+                    <source>${jdkVersion}</source>
+                    <target>${jdkVersion}</target>
+                    <!--
+                    <testSource>${testJreVersion}</testSource>
+                    <testTarget>${testJreVersion}</testTarget>
+                    -->
                 </configuration>
             </plugin>
+            <!-- Unit Test Plugin
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.19.1</version>
+                <configuration>
+                    <argLine>-Dfile.encoding=${projectEncoding} ${argLine}</argLine>
+                </configuration>
+            </plugin>
+			-->
+            <!-- Libs Shading and Relocation -->
+            <plugin>
+                <!--Relocate all lib we use in order to fix class loading errors if we use different versions
+                than already loaded libs (i.e. by Mojang -> gson)-->
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>2.4.3</version>
+                <configuration>
+                    <createDependencyReducedPom>false</createDependencyReducedPom>
+                    <minimizeJar>false</minimizeJar>
+                    <relocations>
+                        <relocation>
+                            <pattern>org.spacehq.opennbt</pattern>
+                            <shadedPattern>us.myles.viaversion.libs.opennbt</shadedPattern>
+                        </relocation>
+                        <relocation>
+                            <pattern>com.google.gson</pattern>
+                            <shadedPattern>us.myles.viaversion.libs.gson</shadedPattern>
+                        </relocation>
+                        <relocation>
+                            <pattern>org.javassist</pattern>
+                            <shadedPattern>us.myles.viaversion.libs.javassist</shadedPattern>
+                        </relocation>
+                    </relocations>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
+
+    <repositories>
+        <!-- SpigotMC Repo (Bukkit API) -->
+        <repository>
+            <id>spigot-repo</id>
+            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots</url>
+        </repository>
+
+        <!-- SpaceHQ Repo-->
+        <repository>
+            <id>spacehq-repo</id>
+            <url>https://repo.spacehq.org/content/repositories/releases/</url>
+        </repository>
+
+        <!-- Bungee repo -->
+        <repository>
+            <id>bungeecord-repo</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </repository>
+    </repositories>
+
     <dependencies>
+        <!-- Bukkit API, http://www.spigotmc.org/ or http://bukkit.org/ -->
         <dependency>
             <groupId>org.bukkit</groupId>
             <artifactId>bukkit</artifactId>
-            <version>1.8.8-R0.1-SNAPSHOT</version>
+            <version>${bukkitVersion}</version>
             <scope>provided</scope>
+            <optional>true</optional>
+            <exclusions>
+                <exclusion>
+                    <artifactId>junit</artifactId>
+                    <groupId>junit</groupId>
+                </exclusion>
+                <exclusion>
+                    <artifactId>gson</artifactId>
+                    <groupId>com.google.code.gson</groupId>
+                </exclusion>
+                <exclusion>
+                    <artifactId>persistence-api</artifactId>
+                    <groupId>javax.persistence</groupId>
+                </exclusion>
+            </exclusions>
         </dependency>
+
+        <!-- Javassist (Bytecode Library) -->
+        <dependency>
+            <groupId>org.javassist</groupId>
+            <artifactId>javassist</artifactId>
+            <version>3.20.0-GA</version>
+            <scope>compile</scope>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- NBT Edit Library -->
+        <dependency>
+            <groupId>org.spacehq</groupId>
+            <artifactId>opennbt</artifactId>
+            <version>1.0</version>
+            <scope>compile</scope>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- GSON (JSON Library) -->
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>2.6.2</version>
+            <scope>compile</scope>
+            <optional>true</optional>
+        </dependency>
+
+        <!-- Netty (Network Library) -->
         <dependency>
             <groupId>io.netty</groupId>
             <artifactId>netty-all</artifactId>
             <version>4.0.20.Final</version>
             <scope>provided</scope>
+            <optional>true</optional>
         </dependency>
+
+        <!-- Lombok -->
         <dependency>
-            <groupId>com.google.code.gson</groupId>
-            <artifactId>gson</artifactId>
-            <version>2.4</version>
+            <groupId>org.projectlombok</groupId>
+            <artifactId>lombok</artifactId>
+            <version>1.16.6</version>
             <scope>provided</scope>
         </dependency>
+
+        <!--Bungeecord-->
         <dependency>
-            <groupId>com.google.guava</groupId>
-            <artifactId>guava</artifactId>
-            <version>18.0</version>
+            <groupId>net.md-5</groupId>
+            <artifactId>bungeecord-api</artifactId>
+            <version>1.9-SNAPSHOT</version>
             <scope>provided</scope>
         </dependency>
     </dependencies>
-    <repositories>
-        <repository>
-            <id>spigot-repo</id>
-            <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
-        </repository>
-   </repositories>
 </project>

src/main/java/org/spacehq/mc/protocol/data/game/chunk/BlockStorage.java

@@ -1,126 +0,0 @@
-package org.spacehq.mc.protocol.data.game.chunk;
-
-import io.netty.buffer.ByteBuf;
-import us.myles.ViaVersion.PacketUtil;
-
-import java.io.IOException;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-
-public class BlockStorage {
-    private int bitsPerEntry;
-
-    private List<Integer> states;
-    private FlexibleStorage storage;
-
-    public BlockStorage() {
-        this.bitsPerEntry = 4;
-
-        this.states = new ArrayList<Integer>();
-        this.states.add(0);
-
-        this.storage = new FlexibleStorage(this.bitsPerEntry, 4096);
-    }
-
-    public BlockStorage(ByteBuf in) throws IOException {
-        this.bitsPerEntry = in.readUnsignedByte();
-
-        this.states = new ArrayList<Integer>();
-        int stateCount = PacketUtil.readVarInt(in);
-        for (int i = 0; i < stateCount; i++) {
-            this.states.add(PacketUtil.readVarInt(in));
-        }
-
-        this.storage = new FlexibleStorage(this.bitsPerEntry, PacketUtil.readLongs(PacketUtil.readVarInt(in), in));
-    }
-
-    public void write(ByteBuf out) throws IOException {
-        out.writeByte(this.bitsPerEntry);
-
-        PacketUtil.writeVarInt(this.states.size(), out);
-        for (int state : this.states) {
-            PacketUtil.writeVarInt(state, out);
-        }
-
-        long[] data = this.storage.getData();
-        PacketUtil.writeVarInt(data.length, out);
-        PacketUtil.writeLongs(data, out);
-    }
-
-    public int getBitsPerEntry() {
-        return this.bitsPerEntry;
-    }
-
-    public List<Integer> getStates() {
-        return Collections.unmodifiableList(this.states);
-    }
-
-    public FlexibleStorage getStorage() {
-        return this.storage;
-    }
-
-    public int get(int x, int y, int z) {
-        int id = this.storage.get(index(x, y, z));
-        return this.bitsPerEntry <= 8 ? (id >= 0 && id < this.states.size() ? this.states.get(id) : 0) : id;
-    }
-
-    public void set(int x, int y, int z, int state) {
-        set(index(x, y, z), state);
-    }
-
-    public void set(int ind, int state) {
-        int id = this.bitsPerEntry <= 8 ? this.states.indexOf(state) : state;
-        if (id == -1) {
-            this.states.add(state);
-            if (this.states.size() > 1 << this.bitsPerEntry) {
-                this.bitsPerEntry++;
-
-                List<Integer> oldStates = this.states;
-                if (this.bitsPerEntry > 8) {
-                    oldStates = new ArrayList<Integer>(this.states);
-                    this.states.clear();
-                    this.bitsPerEntry = 13;
-                }
-
-                FlexibleStorage oldStorage = this.storage;
-                this.storage = new FlexibleStorage(this.bitsPerEntry, this.storage.getSize());
-                for (int index = 0; index < this.storage.getSize(); index++) {
-                    int value = oldStorage.get(index);
-                    this.storage.set(index, this.bitsPerEntry <= 8 ? value : oldStates.get(value));
-                }
-            }
-
-            id = this.bitsPerEntry <= 8 ? this.states.indexOf(state) : state;
-        }
-
-        this.storage.set(ind, id);
-    }
-
-    public boolean isEmpty() {
-        for (int index = 0; index < this.storage.getSize(); index++) {
-            if (this.storage.get(index) != 0) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    private static int index(int x, int y, int z) {
-        return y << 8 | z << 4 | x;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        return this == o || (o instanceof BlockStorage && this.bitsPerEntry == ((BlockStorage) o).bitsPerEntry && this.states.equals(((BlockStorage) o).states) && this.storage.equals(((BlockStorage) o).storage));
-    }
-
-    @Override
-    public int hashCode() {
-        int result = this.bitsPerEntry;
-        result = 31 * result + this.states.hashCode();
-        result = 31 * result + this.storage.hashCode();
-        return result;
-    }
-}

src/main/java/org/spacehq/mc/protocol/data/game/chunk/Chunk.java

@@ -1,46 +0,0 @@
-package org.spacehq.mc.protocol.data.game.chunk;
-
-public class Chunk {
-    private BlockStorage blocks;
-    private NibbleArray3d blocklight;
-    private NibbleArray3d skylight;
-
-    public Chunk(boolean skylight) {
-        this(new BlockStorage(), new NibbleArray3d(2048), skylight ? new NibbleArray3d(2048) : null);
-    }
-
-    public Chunk(BlockStorage blocks, NibbleArray3d blocklight, NibbleArray3d skylight) {
-        this.blocks = blocks;
-        this.blocklight = blocklight;
-        this.skylight = skylight;
-    }
-
-    public BlockStorage getBlocks() {
-        return this.blocks;
-    }
-
-    public NibbleArray3d getBlockLight() {
-        return this.blocklight;
-    }
-
-    public NibbleArray3d getSkyLight() {
-        return this.skylight;
-    }
-
-    public boolean isEmpty() {
-        return this.blocks.isEmpty();
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        return this == o || (o instanceof Chunk && this.blocks.equals(((Chunk) o).blocks) && this.blocklight.equals(((Chunk) o).blocklight) && ((this.skylight == null && (((Chunk) o).skylight == null)) || (this.skylight != null && this.skylight.equals(((Chunk) o).skylight))));
-    }
-
-    @Override
-    public int hashCode() {
-        int result = this.blocks.hashCode();
-        result = 31 * result + this.blocklight.hashCode();
-        result = 31 * result + (this.skylight != null ? this.skylight.hashCode() : 0);
-        return result;
-    }
-}

src/main/java/org/spacehq/mc/protocol/data/game/chunk/Column.java

@@ -1,69 +0,0 @@
-package org.spacehq.mc.protocol.data.game.chunk;
-
-public class Column {
-    private int x;
-    private int z;
-    private Chunk chunks[];
-    private byte biomeData[];
-
-    private boolean skylight;
-
-    public Column(int x, int z, Chunk chunks[]) {
-        this(x, z, chunks, null);
-    }
-
-    public Column(int x, int z, Chunk chunks[], byte biomeData[]) {
-        if(chunks.length != 16) {
-            throw new IllegalArgumentException("Chunk array length must be 16.");
-        }
-
-        if(biomeData != null && biomeData.length != 256) {
-            throw new IllegalArgumentException("Biome data array length must be 256.");
-        }
-
-        this.skylight = false;
-        boolean noSkylight = false;
-        for(int index = 0; index < chunks.length; index++) {
-            if(chunks[index] != null) {
-                if(chunks[index].getSkyLight() == null) {
-                    noSkylight = true;
-                } else {
-                    this.skylight = true;
-                }
-            }
-        }
-
-        if(noSkylight && this.skylight) {
-            throw new IllegalArgumentException("Either all chunks must have skylight values or none must have them.");
-        }
-
-        this.x = x;
-        this.z = z;
-        this.chunks = chunks;
-        this.biomeData = biomeData;
-    }
-
-    public int getX() {
-        return this.x;
-    }
-
-    public int getZ() {
-        return this.z;
-    }
-
-    public Chunk[] getChunks() {
-        return this.chunks;
-    }
-
-    public boolean hasBiomeData() {
-        return this.biomeData != null;
-    }
-
-    public byte[] getBiomeData() {
-        return this.biomeData;
-    }
-
-    public boolean hasSkylight() {
-        return this.skylight;
-    }
-}

src/main/java/org/spacehq/mc/protocol/data/game/chunk/FlexibleStorage.java

@@ -1,104 +0,0 @@
-package org.spacehq.mc.protocol.data.game.chunk;
-
-import java.util.Arrays;
-
-public class FlexibleStorage {
-    private final long[] data;
-    private final int bitsPerEntry;
-    private final int size;
-    private final long maxEntryValue;
-
-    public FlexibleStorage(int bitsPerEntry, int size) {
-        this(bitsPerEntry, new long[roundToNearest(size * bitsPerEntry, 64) / 64]);
-    }
-
-    public FlexibleStorage(int bitsPerEntry, long[] data) {
-        if(bitsPerEntry < 1 || bitsPerEntry > 32) {
-            throw new IllegalArgumentException("BitsPerEntry cannot be outside of accepted range.");
-        }
-
-        this.bitsPerEntry = bitsPerEntry;
-        this.data = data;
-
-        this.size = this.data.length * 64 / this.bitsPerEntry;
-        this.maxEntryValue = (1L << this.bitsPerEntry) - 1;
-    }
-
-    public long[] getData() {
-        return this.data;
-    }
-
-    public int getBitsPerEntry() {
-        return this.bitsPerEntry;
-    }
-
-    public int getSize() {
-        return this.size;
-    }
-
-    public int get(int index) {
-        if(index < 0 || index > this.size - 1) {
-            throw new IndexOutOfBoundsException();
-        }
-
-        int bitIndex = index * this.bitsPerEntry;
-        int startIndex = bitIndex / 64;
-        int endIndex = ((index + 1) * this.bitsPerEntry - 1) / 64;
-        int startBitSubIndex = bitIndex % 64;
-        if(startIndex == endIndex) {
-            return (int) (this.data[startIndex] >>> startBitSubIndex & this.maxEntryValue);
-        } else {
-            int endBitSubIndex = 64 - startBitSubIndex;
-            return (int) ((this.data[startIndex] >>> startBitSubIndex | this.data[endIndex] << endBitSubIndex) & this.maxEntryValue);
-        }
-    }
-
-    public void set(int index, int value) {
-        if(index < 0 || index > this.size - 1) {
-            throw new IndexOutOfBoundsException();
-        }
-
-        if(value < 0 || value > this.maxEntryValue) {
-            throw new IllegalArgumentException("Value cannot be outside of accepted range.");
-        }
-
-        int bitIndex = index * this.bitsPerEntry;
-        int startIndex = bitIndex / 64;
-        int endIndex = ((index + 1) * this.bitsPerEntry - 1) / 64;
-        int startBitSubIndex = bitIndex % 64;
-        this.data[startIndex] = this.data[startIndex] & ~(this.maxEntryValue << startBitSubIndex) | ((long) value & this.maxEntryValue) << startBitSubIndex;
-        if(startIndex != endIndex) {
-            int endBitSubIndex = 64 - startBitSubIndex;
-            this.data[endIndex] = this.data[endIndex] >>> endBitSubIndex << endBitSubIndex | ((long) value & this.maxEntryValue) >> endBitSubIndex;
-        }
-    }
-
-    private static int roundToNearest(int value, int roundTo) {
-        if(roundTo == 0) {
-            return 0;
-        } else if(value == 0) {
-            return roundTo;
-        } else {
-            if(value < 0) {
-                roundTo *= -1;
-            }
-
-            int remainder = value % roundTo;
-            return remainder != 0 ? value + roundTo - remainder : value;
-        }
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        return this == o || (o instanceof FlexibleStorage && Arrays.equals(this.data, ((FlexibleStorage) o).data) && this.bitsPerEntry == ((FlexibleStorage) o).bitsPerEntry && this.size == ((FlexibleStorage) o).size && this.maxEntryValue == ((FlexibleStorage) o).maxEntryValue);
-    }
-
-    @Override
-    public int hashCode() {
-        int result = Arrays.hashCode(this.data);
-        result = 31 * result + this.bitsPerEntry;
-        result = 31 * result + this.size;
-        result = 31 * result + (int) this.maxEntryValue;
-        return result;
-    }
-}

src/main/java/org/spacehq/mc/protocol/data/game/chunk/NibbleArray3d.java

@@ -1,71 +0,0 @@
-package org.spacehq.mc.protocol.data.game.chunk;
-
-import io.netty.buffer.ByteBuf;
-
-import java.io.IOException;
-import java.util.Arrays;
-
-public class NibbleArray3d {
-    private byte[] data;
-
-    public NibbleArray3d(int size) {
-        this.data = new byte[size];
-    }
-
-    public NibbleArray3d(byte[] array) {
-        this.data = array;
-    }
-
-    public NibbleArray3d(ByteBuf in, int size) throws IOException {
-        this.data = new byte[size];
-        in.readBytes(this.data);
-    }
-
-    public void write(ByteBuf out) throws IOException {
-        out.writeBytes(this.data);
-    }
-
-    public byte[] getData() {
-        return this.data;
-    }
-
-    public int get(int x, int y, int z) {
-        int key = y << 8 | z << 4 | x;
-        int index = key >> 1;
-        int part = key & 1;
-        return part == 0 ? this.data[index] & 15 : this.data[index] >> 4 & 15;
-    }
-
-    public void set(int x, int y, int z, int val) {
-        int key = y << 8 | z << 4 | x;
-        int index = key >> 1;
-        int part = key & 1;
-        if(part == 0) {
-            this.data[index] = (byte) (this.data[index] & 240 | val & 15);
-        } else {
-            this.data[index] = (byte) (this.data[index] & 15 | (val & 15) << 4);
-        }
-    }
-
-    public void fill(int val) {
-        for(int index = 0; index < this.data.length << 1; index++) {
-            int ind = index >> 1;
-            int part = index & 1;
-            if(part == 0) {
-                this.data[ind] = (byte) (this.data[ind] & 240 | val & 15);
-            } else {
-                this.data[ind] = (byte) (this.data[ind] & 15 | (val & 15) << 4);
-            }
-        }
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        return this == o || (o instanceof NibbleArray3d && Arrays.equals(this.data, ((NibbleArray3d) o).data));
-    }
-
-    @Override
-    public int hashCode() {
-        return Arrays.hashCode(this.data);
-    }
-}

src/main/java/org/spacehq/mc/protocol/util/NetUtil.java

@@ -1,114 +0,0 @@
-package org.spacehq.mc.protocol.util;
-
-import io.netty.buffer.ByteBuf;
-import org.spacehq.mc.protocol.data.game.chunk.Chunk;
-import org.spacehq.mc.protocol.data.game.chunk.Column;
-import org.spacehq.mc.protocol.data.game.chunk.NibbleArray3d;
-
-import java.io.IOException;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.ShortBuffer;
-
-/* From https://github.com/Steveice10/MCProtocolLib/ */
-/* No credit taken for writing this code, and used accordance to it's license
-   Original by Steveice10, modified to suit this plugin.
- */
-public class NetUtil {
-    public static int writeNewColumn(ByteBuf out, Column column, boolean fullChunk, boolean hasSkylight) throws IOException {
-        int mask = 0;
-        Chunk chunks[] = column.getChunks();
-        for(int index = 0; index < chunks.length; index++) {
-            Chunk chunk = chunks[index];
-            if(chunk != null && (!fullChunk || !chunk.isEmpty())) {
-                mask |= 1 << index;
-                chunk.getBlocks().write(out);
-                chunk.getBlockLight().write(out);
-                if(hasSkylight || column.hasSkylight()) {
-                    chunk.getSkyLight().write(out); // TODO: Make a PR to original lib to correct this
-                }
-            }
-        }
-
-        if(fullChunk) {
-            out.writeBytes(column.getBiomeData());
-        }
-
-        return mask;
-    }
-
-    public static Column readOldChunkData(int x, int z, boolean isFullChunk, int bitmask, byte[] input, boolean checkForSky, boolean hasSkyLight) {
-        int pos = 0;
-        int expected = 0;
-        boolean sky = false;
-        ShortBuffer buf = ByteBuffer.wrap(input).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();
-        // 0 = Calculate expected length and determine if the packet has skylight.
-        // 1 = Create chunks from mask and get blocks.
-        // 2 = Get block light.
-        // 3 = Get sky light.
-        Chunk[] chunks = new Chunk[16];
-
-        for(int pass = 0; pass < 4; pass++) {
-            for(int ind = 0; ind < 16; ind++) {
-                if((bitmask & 1 << ind) != 0) {
-                    if(pass == 0) {
-                        // Block length + Blocklight length
-                        expected += (4096 * 2) + 2048;
-                    }
-
-                    if(pass == 1) {
-                        chunks[ind] = new Chunk(sky || hasSkyLight);
-
-                        buf.position(pos / 2);
-                        short[] tempData = new short[4096];
-                        buf.get(tempData, 0, tempData.length);
-                        // convert short array to new one
-                        int index = 0;
-                        for(short ss:tempData){
-                            // s is 16 bits, 12 bits id and 4 bits data
-                            int data = ss & 0xF;
-                            int id = (ss >> 4) << 4 | data;
-
-                            int newCombined = id ; // test
-
-                            chunks[ind].getBlocks().set(index, newCombined);
-                            index++;
-                        }
-                        pos += tempData.length * 2;
-
-                    }
-
-                    if(pass == 2) {
-                        NibbleArray3d blocklight = chunks[ind].getBlockLight();
-                        System.arraycopy(input, pos, blocklight.getData(), 0, blocklight.getData().length);
-                        pos += blocklight.getData().length;
-                    }
-
-                    if(pass == 3) {
-                        if(chunks[ind].getSkyLight() != null) {
-                            NibbleArray3d skylight = chunks[ind].getSkyLight();
-                            System.arraycopy(input, pos, skylight.getData(), 0, skylight.getData().length);
-                            pos += skylight.getData().length;
-                        }
-                    }
-                }
-            }
-
-            if(pass == 0) {
-                // If we have more data than blocks and blocklight combined, there must be skylight data as well.
-                if(input.length > expected) {
-                    sky = checkForSky;
-                }
-            }
-        }
-
-        byte biomeData[] = null;
-        if(isFullChunk) {
-            biomeData = new byte[256];
-            System.arraycopy(input, pos, biomeData, 0, biomeData.length);
-        }
-
-        Column column = new Column(x, z, chunks, biomeData);
-        return column;
-    }
-}

src/main/java/us/myles/ViaVersion/Bungee.java

@@ -0,0 +1,18 @@
+package us.myles.ViaVersion;
+
+import net.md_5.bungee.api.plugin.Plugin;
+
+import static net.md_5.bungee.api.ChatColor.RED;
+
+public class Bungee extends Plugin {
+
+    @Override
+    public void onEnable() {
+        getLogger().severe(RED + "===============================================");
+        getLogger().severe(RED + "ViaVersion is NOT a Bungeecord plugin");
+        getLogger().severe(RED + "Install this plugin on all your spigot/bukkit");
+        getLogger().severe(RED + "servers and use the latest Bungeecord version");
+        getLogger().severe(RED + "to make ViaVersion work with BungeeCord.");
+        getLogger().severe(RED + "===============================================");
+    }
+}

src/main/java/us/myles/ViaVersion/CancelException.java

@@ -1,4 +0,0 @@
-package us.myles.ViaVersion;
-
-public class CancelException extends Exception{
-}

src/main/java/us/myles/ViaVersion/ConnectionInfo.java

@@ -1,59 +0,0 @@
-package us.myles.ViaVersion;
-
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Player;
-import us.myles.ViaVersion.packets.State;
-
-import java.util.UUID;
-
-public class ConnectionInfo {
-    private int protocol = 0;
-    private State state = State.HANDSHAKE;
-    private int compression = 0;
-    private Object lastPacket;
-    private java.util.UUID UUID;
-
-    public int getProtocol() {
-        return protocol;
-    }
-
-    public void setProtocol(int protocol) {
-        this.protocol = protocol;
-    }
-
-    public State getState() {
-        return state;
-    }
-
-    public void setState(State state) {
-        this.state = state;
-    }
-
-    public void setCompression(int compression) {
-        this.compression = compression;
-    }
-
-    public int getCompression() {
-        return compression;
-    }
-
-    public void setLastPacket(Object lastPacket) {
-        this.lastPacket = lastPacket;
-    }
-
-    public Object getLastPacket() {
-        return lastPacket;
-    }
-
-    public void setUUID(UUID UUID) {
-        this.UUID = UUID;
-    }
-
-    public java.util.UUID getUUID() {
-        return UUID;
-    }
-
-    public Player getPlayer() {
-        return UUID == null ? null : Bukkit.getPlayer(UUID);
-    }
-}

src/main/java/us/myles/ViaVersion/Core.java

@@ -1,94 +0,0 @@
-package us.myles.ViaVersion;
-
-import io.netty.channel.ChannelFuture;
-import io.netty.channel.ChannelHandler;
-import io.netty.channel.ChannelInitializer;
-import io.netty.channel.ChannelPipeline;
-import io.netty.channel.socket.SocketChannel;
-import org.bukkit.Bukkit;
-import org.bukkit.entity.Entity;
-import org.bukkit.entity.Player;
-import org.bukkit.inventory.ItemStack;
-import org.bukkit.plugin.java.JavaPlugin;
-import us.myles.ViaVersion.handlers.ViaVersionInitializer;
-
-import java.util.List;
-import java.util.UUID;
-import java.util.concurrent.Callable;
-import java.util.concurrent.TimeUnit;
-
-public class Core extends JavaPlugin {
-    @Override
-    public void onEnable() {
-        System.out.println("ViaVersion enabled, injecting. (Allows 1.8 to be accessed via 1.9)");
-        try {
-            injectPacketHandler();
-        } catch (Exception e) {
-            if(Bukkit.getPluginManager().getPlugin("ProtocolLib") != null){
-                System.out.println("This plugin is not compatible with protocol lib.");
-            }
-            System.out.println("Unable to inject handlers, are you on 1.8? ");
-            e.printStackTrace();
-        }
-    }
-
-    public void injectPacketHandler() throws Exception {
-        Class<?> serverClazz = ReflectionUtil.nms("MinecraftServer");
-        Object server = ReflectionUtil.invokeStatic(serverClazz, "getServer");
-        Object connection = serverClazz.getDeclaredMethod("getServerConnection").invoke(server);
-
-        List<ChannelFuture> futures = ReflectionUtil.get(connection, "g", List.class);
-        if (futures.size() == 0) {
-            throw new Exception("Could not find server to inject (late bind?)");
-        }
-
-        for (ChannelFuture future : futures) {
-            ChannelPipeline pipeline = future.channel().pipeline();
-            ChannelHandler bootstrapAcceptor = pipeline.first();
-            ChannelInitializer<SocketChannel> oldInit = ReflectionUtil.get(bootstrapAcceptor, "childHandler", ChannelInitializer.class);
-            ChannelInitializer newInit = new ViaVersionInitializer(oldInit);
-            ReflectionUtil.set(bootstrapAcceptor, "childHandler", newInit);
-        }
-    }
-
-
-    public static Entity getEntity(final UUID player, final int id) {
-        try {
-            return Bukkit.getScheduler().callSyncMethod(getPlugin(Core.class), new Callable<Entity>() {
-                @Override
-                public Entity call() throws Exception {
-                    Player p = Bukkit.getPlayer(player);
-                    if (p == null) return null;
-                    for (Entity e : p.getWorld().getEntities()) {
-                        if (e.getEntityId() == id) {
-                            return e;
-                        }
-                    }
-                    return null;
-                }
-            }).get(10, TimeUnit.SECONDS);
-        } catch (Exception e) {
-            System.out.println("Error fetching entity ");
-            e.printStackTrace();
-            return null;
-        }
-    }
-
-    public static ItemStack getHandItem(final ConnectionInfo info) {
-        try {
-            return Bukkit.getScheduler().callSyncMethod(getPlugin(Core.class), new Callable<ItemStack>() {
-                @Override
-                public ItemStack call() throws Exception {
-                    if (info.getPlayer() != null) {
-                        return info.getPlayer().getItemInHand();
-                    }
-                    return null;
-                }
-            }).get(10, TimeUnit.SECONDS);
-        } catch (Exception e) {
-            System.out.println("Error fetching hand item ");
-            e.printStackTrace();
-            return null;
-        }
-    }
-}

src/main/java/us/myles/ViaVersion/PacketUtil.java

@@ -1,359 +0,0 @@
-package us.myles.ViaVersion;
-
-import com.google.common.base.Charsets;
-import com.google.common.base.Preconditions;
-import io.netty.buffer.ByteBuf;
-import io.netty.channel.ChannelHandlerContext;
-import io.netty.handler.codec.ByteToMessageDecoder;
-import io.netty.handler.codec.MessageToByteEncoder;
-import us.myles.ViaVersion.chunks.MagicBitSet;
-import us.myles.ViaVersion.chunks.PacketChunk;
-import us.myles.ViaVersion.chunks.PacketChunkData;
-
-import java.io.ByteArrayOutputStream;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-import java.nio.ByteBuffer;
-import java.nio.ByteOrder;
-import java.nio.ShortBuffer;
-import java.util.ArrayList;
-import java.util.BitSet;
-import java.util.List;
-import java.util.UUID;
-
-public class PacketUtil {
-    private static Method DECODE_METHOD;
-    private static Method ENCODE_METHOD;
-
-    static {
-        try {
-            DECODE_METHOD = ByteToMessageDecoder.class.getDeclaredMethod("decode", ChannelHandlerContext.class, ByteBuf.class, List.class);
-            DECODE_METHOD.setAccessible(true);
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-            System.out.println("Netty issue?");
-        }
-        try {
-            ENCODE_METHOD = MessageToByteEncoder.class.getDeclaredMethod("encode", ChannelHandlerContext.class, Object.class, ByteBuf.class);
-            ENCODE_METHOD.setAccessible(true);
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-            System.out.println("Netty issue?");
-        }
-    }
-
-    public static ByteBuf decompress(ChannelHandlerContext ctx, ByteBuf msg) {
-        ByteToMessageDecoder x = (ByteToMessageDecoder) ctx.pipeline().get("decompress");
-        List<Object> output = new ArrayList<Object>();
-        try {
-            PacketUtil.DECODE_METHOD.invoke(x, ctx, msg, output);
-        } catch (IllegalAccessException e) {
-            e.printStackTrace();
-        } catch (InvocationTargetException e) {
-            e.printStackTrace();
-        }
-        return output.size() == 0 ? null : (ByteBuf) output.get(0);
-    }
-
-    public static ByteBuf compress(ChannelHandlerContext ctx, ByteBuf msg) {
-        MessageToByteEncoder x = (MessageToByteEncoder) ctx.pipeline().get("compress");
-        ByteBuf output = ctx.alloc().buffer();
-        try {
-            PacketUtil.ENCODE_METHOD.invoke(x, ctx, msg, output);
-        } catch (IllegalAccessException e) {
-            e.printStackTrace();
-        } catch (InvocationTargetException e) {
-            e.printStackTrace();
-        }
-        return output;
-    }
-
-    /* I take no credit, these are taken from BungeeCord */
-    // https://github.com/SpigotMC/BungeeCord/blob/master/protocol/src/main/java/net/md_5/bungee/protocol/DefinedPacket.java
-    public static void writeString(String s, ByteBuf buf) {
-        Preconditions.checkArgument(s.length() <= Short.MAX_VALUE, "Cannot send string longer than Short.MAX_VALUE (got %s characters)", s.length());
-
-        byte[] b = s.getBytes(Charsets.UTF_8);
-        writeVarInt(b.length, buf);
-        buf.writeBytes(b);
-    }
-
-    public static String readString(ByteBuf buf) {
-        int len = readVarInt(buf);
-        Preconditions.checkArgument(len <= Short.MAX_VALUE, "Cannot receive string longer than Short.MAX_VALUE (got %s characters)", len);
-
-        byte[] b = new byte[len];
-        buf.readBytes(b);
-
-        return new String(b, Charsets.UTF_8);
-    }
-
-    public static void writeArrayLegacy(byte[] b, ByteBuf buf, boolean allowExtended) {
-        // (Integer.MAX_VALUE & 0x1FFF9A ) = 2097050 - Forge's current upper limit
-        if (allowExtended) {
-            Preconditions.checkArgument(b.length <= (Integer.MAX_VALUE & 0x1FFF9A), "Cannot send array longer than 2097050 (got %s bytes)", b.length);
-        } else {
-            Preconditions.checkArgument(b.length <= Short.MAX_VALUE, "Cannot send array longer than Short.MAX_VALUE (got %s bytes)", b.length);
-        }
-        // Write a 2 or 3 byte number that represents the length of the packet. (3 byte "shorts" for Forge only)
-        // No vanilla packet should give a 3 byte packet, this method will still retain vanilla behaviour.
-        writeVarShort(buf, b.length);
-        buf.writeBytes(b);
-    }
-
-    public static byte[] readArrayLegacy(ByteBuf buf) {
-        // Read in a 2 or 3 byte number that represents the length of the packet. (3 byte "shorts" for Forge only)
-        // No vanilla packet should give a 3 byte packet, this method will still retain vanilla behaviour.
-        int len = readVarShort(buf);
-
-        // (Integer.MAX_VALUE & 0x1FFF9A ) = 2097050 - Forge's current upper limit
-        Preconditions.checkArgument(len <= (Integer.MAX_VALUE & 0x1FFF9A), "Cannot receive array longer than 2097050 (got %s bytes)", len);
-
-        byte[] ret = new byte[len];
-        buf.readBytes(ret);
-        return ret;
-    }
-
-    public static void writeArray(byte[] b, ByteBuf buf) {
-        writeVarInt(b.length, buf);
-        buf.writeBytes(b);
-    }
-
-    public static byte[] readArray(ByteBuf buf) {
-        byte[] ret = new byte[readVarInt(buf)];
-        buf.readBytes(ret);
-        return ret;
-    }
-
-    public static void writeStringArray(List<String> s, ByteBuf buf) {
-        writeVarInt(s.size(), buf);
-        for (String str : s) {
-            writeString(str, buf);
-        }
-    }
-
-    public static List<String> readStringArray(ByteBuf buf) {
-        int len = readVarInt(buf);
-        List<String> ret = new ArrayList<String>(len);
-        for (int i = 0; i < len; i++) {
-            ret.add(readString(buf));
-        }
-        return ret;
-    }
-
-    public static int readVarInt(ByteBuf input) {
-        return readVarInt(input, 5);
-    }
-
-    public static int readVarInt(ByteBuf input, int maxBytes) {
-        int out = 0;
-        int bytes = 0;
-        byte in;
-        while (true) {
-            in = input.readByte();
-
-            out |= (in & 0x7F) << (bytes++ * 7);
-
-            if (bytes > maxBytes) {
-                throw new RuntimeException("VarInt too big");
-            }
-
-            if ((in & 0x80) != 0x80) {
-                break;
-            }
-        }
-
-        return out;
-    }
-
-    public static void writeVarInt(int value, ByteBuf output) {
-        int part;
-        while (true) {
-            part = value & 0x7F;
-
-            value >>>= 7;
-            if (value != 0) {
-                part |= 0x80;
-            }
-
-            output.writeByte(part);
-
-            if (value == 0) {
-                break;
-            }
-        }
-    }
-
-    public static int readVarShort(ByteBuf buf) {
-        int low = buf.readUnsignedShort();
-        int high = 0;
-        if ((low & 0x8000) != 0) {
-            low = low & 0x7FFF;
-            high = buf.readUnsignedByte();
-        }
-        return ((high & 0xFF) << 15) | low;
-    }
-
-    public static void writeVarShort(ByteBuf buf, int toWrite) {
-        int low = toWrite & 0x7FFF;
-        int high = (toWrite & 0x7F8000) >> 15;
-        if (high != 0) {
-            low = low | 0x8000;
-        }
-        buf.writeShort(low);
-        if (high != 0) {
-            buf.writeByte(high);
-        }
-    }
-
-    public static void writeUUID(UUID value, ByteBuf output) {
-        output.writeLong(value.getMostSignificantBits());
-        output.writeLong(value.getLeastSignificantBits());
-    }
-
-    public static UUID readUUID(ByteBuf input) {
-        return new UUID(input.readLong(), input.readLong());
-    }
-
-    public static void writeLongs(long[] data, ByteBuf output) {
-        for (int index = 0; index < data.length; index++) {
-            output.writeLong(data[index]);
-        }
-    }
-
-    public static long[] readLongs(int amount, ByteBuf output) {
-        long data[] = new long[amount];
-        for (int index = 0; index < amount; index++) {
-            data[index] = output.readLong();
-        }
-
-        return data;
-    }
-
-    // This method is based on one from here
-    // https://github.com/Steveice10/MCProtocolLib/blob/master/src/main/java/org/spacehq/mc/protocol/util/NetUtil.java
-    public static PacketChunk readChunkData(boolean isFullChunk, int bitmask, byte[] input) {
-        PacketChunkData[] chunks = new PacketChunkData[16];
-        boolean sky = false;
-        int expected = 0;
-        int position = 0;
-        ShortBuffer blockData = ByteBuffer.wrap(input).order(ByteOrder.LITTLE_ENDIAN).asShortBuffer();
-
-        for (int i = 0; i < chunks.length; i++) {
-            if ((bitmask & 1 << i) != 0) {
-                expected += (4096 * 2) + 2048;
-            }
-        }
-        // If there is more data, then there must be skylights :D
-        if (input.length > expected) {
-            sky = true;
-        }
-
-        // Read block data
-        for (int i = 0; i < chunks.length; i++) {
-            if ((bitmask & 1 << i) != 0) {
-                chunks[i] = new PacketChunkData(sky);
-                blockData.position(position / 2);
-                blockData.get(chunks[i].getBlocks(), 0, 4096);
-                position = position + (4096 * 2);
-            } else {
-                chunks[i] = new PacketChunkData(sky);
-            }
-        }
-        // Read blocklight data
-        for (int i = 0; i < chunks.length; i++) {
-            if ((bitmask & 1 << i) != 0) {
-                System.arraycopy(input, position, chunks[i].getBlockLight(), 0, 2048);
-                position = position + 2048;
-            }
-        }
-        // Read skylight data
-        if (sky) {
-            for (int i = 0; i < chunks.length; i++) {
-                if ((bitmask & 1 << i) != 0) {
-                    System.arraycopy(input, position, chunks[i].getSkyLight(), 0, 2048);
-                    position = position + 2048;
-                }
-            }
-        }
-
-        byte[] biomeData = null;
-
-        if (isFullChunk) {
-            // yay im a full chunk meaning i know my biomes, mommy get the camera!
-            biomeData = new byte[256];
-            System.arraycopy(input, position, biomeData, 0, 256);
-        }
-        return new PacketChunk(chunks, biomeData);
-    }
-
-    public static void writeNewChunk(ByteBuf buffer, PacketChunkData chunk) {
-        // Bits Per Block (We use 0, cause we're not gonna write a palette ;) )
-        buffer.writeByte(0);
-        // No Palette nor length :D
-
-        // Data Array Length
-        byte[] blockData = convertBlockArray(chunk.getBlocks());
-        writeVarInt(blockData.length / 8, buffer); // Notchian is divide by 8
-
-        buffer.writeBytes(blockData);
-        // Block Light
-        buffer.writeBytes(chunk.getBlockLight());
-        // If has skylight, write it
-        if (chunk.getSkyLight() != null) {
-            buffer.writeBytes(chunk.getSkyLight());
-        }
-    }
-
-    private static byte[] convertBlockArray(short[] blocks) {
-        //  block ID for the first 9 bits, and the block damage value for the last 4 bits
-        byte[] output = new byte[6664]; // (16 * 16 * 16 * 13) / 8 :) (plus some for padding ...)
-        ByteArrayOutputStream out = new ByteArrayOutputStream();
-        for (short block : blocks) {
-            int blockID = block >> 4; // (Needs to be to 9 bits)
-            int data = block & 0xF; // 8 bits
-
-        }
-        return null; // todo: finish
-    }
-
-    private static BitSet append(BitSet base, int index, MagicBitSet toAdd) {
-        int length = index;
-        for (int i = 0; i < toAdd.getTrueLength(); i++) {
-            base.set(length + i, toAdd.get(i));
-        }
-        return base;
-    }
-
-    private static MagicBitSet getPaddedBitSet(int value, int bitSize) {
-        MagicBitSet output = new MagicBitSet(bitSize);
-        BitSet temp = BitSet.valueOf(new long[]{value});
-        for (int i = 0; i < bitSize; i++) {
-            output.set(i, false);
-        }
-        int toShift = bitSize - temp.length();
-        for (int i = 0; i < temp.length(); i++) {
-            output.set(toShift + i, temp.get(i));
-        }
-        return output;
-    }
-
-    public static void writeItem(Object value, ByteBuf output) {
-        try {
-            Class<?> serializer = ReflectionUtil.nms("PacketDataSerializer");
-            Object init = serializer.getDeclaredConstructor(ByteBuf.class).newInstance(output);
-            Method toCall = init.getClass().getDeclaredMethod("a", ReflectionUtil.nms("ItemStack"));
-            toCall.invoke(init, value);
-        } catch (ClassNotFoundException e) {
-            e.printStackTrace();
-        } catch (NoSuchMethodException e) {
-            e.printStackTrace();
-        } catch (InstantiationException e) {
-            e.printStackTrace();
-        } catch (IllegalAccessException e) {
-            e.printStackTrace();
-        } catch (InvocationTargetException e) {
-            e.printStackTrace();
-        }
-    }
-}

src/main/java/us/myles/ViaVersion/ReflectionUtil.java

@@ -1,41 +0,0 @@
-package us.myles.ViaVersion;
-
-import org.bukkit.Bukkit;
-
-import java.lang.reflect.Field;
-import java.lang.reflect.InvocationTargetException;
-import java.lang.reflect.Method;
-
-public class ReflectionUtil {
-    private static String BASE = Bukkit.getServer().getClass().getPackage().getName();
-    private static String NMS = BASE.replace("org.bukkit.craftbukkit", "net.minecraft.server");
-
-    public static Class<?> nms(String className) throws ClassNotFoundException {
-        return Class.forName(NMS + "." + className);
-    }
-    public static Class<?> obc(String className) throws ClassNotFoundException {
-        return Class.forName(BASE + "." + className);
-    }
-
-    public static Object invokeStatic(Class<?> clazz, String method) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
-        Method m = clazz.getDeclaredMethod(method);
-        return m.invoke(null);
-    }
-
-    public static Object invoke(Object o, String method) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
-        Method m = o.getClass().getDeclaredMethod(method);
-        return m.invoke(o);
-    }
-
-    public static <T> T get(Object o, String f, Class<T> t) throws NoSuchFieldException, IllegalAccessException {
-        Field field = o.getClass().getDeclaredField(f);
-        field.setAccessible(true);
-        return (T) field.get(o);
-    }
-
-    public static void set(Object o, String f, Object value) throws NoSuchFieldException, IllegalAccessException {
-        Field field = o.getClass().getDeclaredField(f);
-        field.setAccessible(true);
-        field.set(o, value);
-    }
-}

src/main/java/us/myles/ViaVersion/ViaConfig.java

@@ -0,0 +1,157 @@
+package us.myles.ViaVersion;
+
+import us.myles.ViaVersion.api.ViaVersionConfig;
+import us.myles.ViaVersion.util.Configuration;
+
+import java.io.File;
+
+public class ViaConfig implements ViaVersionConfig {
+    private final ViaVersionPlugin plugin;
+
+    public ViaConfig(ViaVersionPlugin plugin) {
+        this.plugin = plugin;
+        generateConfig();
+    }
+
+    public void generateConfig() {
+        File file = new File(plugin.getDataFolder(), "config.yml");
+        if (file.exists()) {
+            // Update conf options
+            Configuration oldConfig = new Configuration(file);
+            oldConfig.reload(false); // Load current options from conf
+            file.delete(); // Delete old conf
+            plugin.saveDefaultConfig(); // Generate new conf
+            Configuration newConfig = new Configuration(file);
+            newConfig.reload(true); // Load default options
+            for (String key : oldConfig.getKeys(false)) {
+                // Set option in new conf if exists
+                if (newConfig.contains(key)) {
+                    newConfig.set(key, oldConfig.get(key));
+                }
+            }
+            newConfig.save();
+        } else {
+            plugin.saveDefaultConfig();
+        }
+    }
+
+    @Override
+    public boolean isCheckForUpdates() {
+        return plugin.getConfig().getBoolean("checkforupdates", true);
+    }
+
+    @Override
+    public boolean isPreventCollision() {
+        return plugin.getConfig().getBoolean("prevent-collision", true);
+    }
+
+    @Override
+    public boolean isNewEffectIndicator() {
+        return plugin.getConfig().getBoolean("use-new-effect-indicator", true);
+    }
+
+    @Override
+    public boolean isShowNewDeathMessages() {
+        return plugin.getConfig().getBoolean("use-new-deathmessages", false);
+    }
+
+    @Override
+    public boolean isSuppressMetadataErrors() {
+        return plugin.getConfig().getBoolean("suppress-metadata-errors", false);
+    }
+
+    @Override
+    public boolean isShieldBlocking() {
+        return plugin.getConfig().getBoolean("shield-blocking", true);
+    }
+
+    @Override
+    public boolean isHologramPatch() {
+        return plugin.getConfig().getBoolean("hologram-patch", false);
+    }
+
+    @Override
+    public boolean isBossbarPatch() {
+        return plugin.getConfig().getBoolean("bossbar-patch", true);
+    }
+
+    @Override
+    public boolean isBossbarAntiflicker() {
+        return plugin.getConfig().getBoolean("bossbar-anti-flicker", false);
+    }
+
+    @Override
+    public boolean isUnknownEntitiesSuppressed() {
+        return false;
+    }
+
+    @Override
+    public double getHologramYOffset() {
+        return plugin.getConfig().getDouble("hologram-y", -1D);
+    }
+
+    @Override
+    public boolean isBlockBreakPatch() {
+        return false;
+    }
+
+    @Override
+    public int getMaxPPS() {
+        return plugin.getConfig().getInt("max-pps", 140);
+    }
+
+    @Override
+    public String getMaxPPSKickMessage() {
+        return plugin.getConfig().getString("max-pps-kick-msg", "Sending packets too fast? lag?");
+    }
+
+    @Override
+    public int getTrackingPeriod() {
+        return plugin.getConfig().getInt("tracking-period", 6);
+    }
+
+    @Override
+    public int getWarningPPS() {
+        return plugin.getConfig().getInt("tracking-warning-pps", 120);
+    }
+
+    @Override
+    public int getMaxWarnings() {
+        return plugin.getConfig().getInt("tracking-max-warnings", 3);
+    }
+
+    @Override
+    public String getMaxWarningsKickMessage() {
+        return plugin.getConfig().getString("tracking-max-kick-msg", "You are sending too many packets, :(");
+    }
+
+    @Override
+    public boolean isAntiXRay() {
+        return plugin.getConfig().getBoolean("anti-xray-patch", true);
+    }
+
+    @Override
+    public boolean isSendSupportedVersions() {
+        return plugin.getConfig().getBoolean("send-supported-versions", false);
+    }
+
+    @Override
+    public boolean isStimulatePlayerTick() {
+        return plugin.getConfig().getBoolean("simulate-pt", true);
+    }
+
+    @Override
+    public boolean isItemCache() {
+        return plugin.getConfig().getBoolean("item-cache", true);
+    }
+
+    @Override
+    public boolean isNMSPlayerTicking() {
+        return plugin.getConfig().getBoolean("nms-player-ticking", true);
+    }
+
+    public boolean isAutoTeam() {
+        // Collision has to be enabled first
+        return isPreventCollision() && plugin.getConfig().getBoolean("auto-team", true);
+    }
+}

src/main/java/us/myles/ViaVersion/ViaVersionPlugin.java

@@ -0,0 +1,471 @@
+package us.myles.ViaVersion;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelFuture;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.ChannelInitializer;
+import io.netty.channel.socket.SocketChannel;
+import lombok.Getter;
+import lombok.NonNull;
+import org.bukkit.Bukkit;
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.PluginDescriptionFile;
+import org.bukkit.plugin.java.JavaPlugin;
+import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.ViaVersionAPI;
+import us.myles.ViaVersion.api.boss.BossBar;
+import us.myles.ViaVersion.api.boss.BossColor;
+import us.myles.ViaVersion.api.boss.BossStyle;
+import us.myles.ViaVersion.api.command.ViaVersionCommand;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.protocol.ProtocolRegistry;
+import us.myles.ViaVersion.boss.ViaBossBar;
+import us.myles.ViaVersion.classgenerator.ClassGenerator;
+import us.myles.ViaVersion.commands.ViaCommandHandler;
+import us.myles.ViaVersion.handlers.ViaVersionInitializer;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+import us.myles.ViaVersion.update.UpdateListener;
+import us.myles.ViaVersion.update.UpdateUtil;
+import us.myles.ViaVersion.util.ListWrapper;
+import us.myles.ViaVersion.util.ReflectionUtil;
+
+import java.lang.reflect.Field;
+import java.lang.reflect.Method;
+import java.util.*;
+import java.util.concurrent.Callable;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+public class ViaVersionPlugin extends JavaPlugin implements ViaVersionAPI {
+
+    private final Map<UUID, UserConnection> portedPlayers = new ConcurrentHashMap<>();
+    private List<ChannelFuture> injectedFutures = new ArrayList<>();
+    private List<Pair<Field, Object>> injectedLists = new ArrayList<>();
+    private ViaCommandHandler commandHandler;
+    private boolean debug = false;
+    private boolean compatSpigotBuild = false;
+    private boolean spigot = true;
+    private boolean lateBind = false;
+    @Getter
+    private ViaConfig conf;
+
+    @Override
+    public void onLoad() {
+        // Config magic
+        conf = new ViaConfig(this);
+        ViaVersion.setInstance(this);
+        // Handle reloads
+        if (System.getProperty("ViaVersion") != null) {
+            if (Bukkit.getPluginManager().getPlugin("ProtocolLib") != null) {
+                getLogger().severe("ViaVersion is already loaded, we're going to kick all the players... because otherwise we'll crash because of ProtocolLib.");
+                for (Player player : Bukkit.getOnlinePlayers()) {
+                    player.kickPlayer("Server reload, please rejoin!");
+                }
+
+            } else {
+                getLogger().severe("ViaVersion is already loaded, this should work fine... Otherwise reboot the server!!!");
+
+            }
+        }
+        // Spigot detector
+        try {
+            Class.forName("org.spigotmc.SpigotConfig");
+        } catch (ClassNotFoundException e) {
+            spigot = false;
+        }
+        // Check if it's a spigot build with a protocol mod
+        try {
+            compatSpigotBuild = ReflectionUtil.nms("PacketEncoder").getDeclaredField("version") != null;
+        } catch (Exception e) {
+            compatSpigotBuild = false;
+        }
+        // Generate classes needed (only works if it's compat)
+        ClassGenerator.generate();
+        lateBind = !isBinded();
+
+        getLogger().info("ViaVersion " + getDescription().getVersion() + (compatSpigotBuild ? "compat" : "") + " is now loaded" + (lateBind ? ", waiting for boot. (late-bind)" : ", injecting!"));
+        if (!lateBind)
+            injectPacketHandler();
+    }
+
+    @Override
+    public void onEnable() {
+        if (lateBind)
+            injectPacketHandler();
+        if (conf.isCheckForUpdates())
+            UpdateUtil.sendUpdateMessage(this);
+        // Gather version :)
+        Bukkit.getScheduler().scheduleSyncDelayedTask(this, new Runnable() {
+            @Override
+            public void run() {
+                gatherProtocolVersion();
+                // Check if there are any pipes to this version
+                if (ProtocolRegistry.SERVER_PROTOCOL != -1) {
+                    getLogger().info("ViaVersion detected protocol version: " + ProtocolRegistry.SERVER_PROTOCOL);
+                    if (!ProtocolRegistry.isWorkingPipe()) {
+                        getLogger().warning("ViaVersion will not function on the current protocol.");
+                    }
+                }
+                ProtocolRegistry.refreshVersions();
+            }
+        });
+
+
+        Bukkit.getPluginManager().registerEvents(new UpdateListener(this), this);
+
+        getCommand("viaversion").setExecutor(commandHandler = new ViaCommandHandler());
+        getCommand("viaversion").setTabCompleter(commandHandler);
+
+        // Register Protocol Listeners
+        ProtocolRegistry.registerListeners();
+
+        // Warn them if they have anti-xray on and they aren't using spigot
+        if (conf.isAntiXRay() && !spigot) {
+            getLogger().info("You have anti-xray on in your config, since you're not using spigot it won't fix xray!");
+        }
+    }
+
+    @Override
+    public void onDisable() {
+        getLogger().info("ViaVersion is disabling, if this is a reload it may not work.");
+        uninject();
+    }
+
+    public void gatherProtocolVersion() {
+        try {
+            Class<?> serverClazz = ReflectionUtil.nms("MinecraftServer");
+            Object server = ReflectionUtil.invokeStatic(serverClazz, "getServer");
+            Class<?> pingClazz = ReflectionUtil.nms("ServerPing");
+            Object ping = null;
+            // Search for ping method
+            for (Field f : serverClazz.getDeclaredFields()) {
+                if (f.getType() != null) {
+                    if (f.getType().getSimpleName().equals("ServerPing")) {
+                        f.setAccessible(true);
+                        ping = f.get(server);
+                    }
+                }
+            }
+            if (ping != null) {
+                Object serverData = null;
+                for (Field f : pingClazz.getDeclaredFields()) {
+                    if (f.getType() != null) {
+                        if (f.getType().getSimpleName().endsWith("ServerData")) {
+                            f.setAccessible(true);
+                            serverData = f.get(ping);
+                        }
+                    }
+                }
+                if (serverData != null) {
+                    int protocolVersion = -1;
+                    for (Field f : serverData.getClass().getDeclaredFields()) {
+                        if (f.getType() != null) {
+                            if (f.getType() == int.class) {
+                                f.setAccessible(true);
+                                protocolVersion = (int) f.get(serverData);
+                            }
+                        }
+                    }
+                    if (protocolVersion != -1) {
+                        ProtocolRegistry.SERVER_PROTOCOL = protocolVersion;
+                        return;
+                    }
+                }
+            }
+        } catch (Exception e) {
+            e.printStackTrace();
+            // We couldn't work it out... We'll just use ping and hope for the best...
+        }
+    }
+
+    public Object getServerConnection() throws Exception {
+        Class<?> serverClazz = ReflectionUtil.nms("MinecraftServer");
+        Object server = ReflectionUtil.invokeStatic(serverClazz, "getServer");
+        Object connection = null;
+        for (Method m : serverClazz.getDeclaredMethods()) {
+            if (m.getReturnType() != null) {
+                if (m.getReturnType().getSimpleName().equals("ServerConnection")) {
+                    if (m.getParameterTypes().length == 0) {
+                        connection = m.invoke(server);
+                    }
+                }
+            }
+        }
+        return connection;
+    }
+
+    public void injectPacketHandler() {
+        try {
+            Object connection = getServerConnection();
+            if (connection == null) {
+                getLogger().warning("We failed to find the ServerConnection? :( What server are you running?");
+                return;
+            }
+            for (Field field : connection.getClass().getDeclaredFields()) {
+                field.setAccessible(true);
+                final Object value = field.get(connection);
+                if (value instanceof List) {
+                    // Inject the list
+                    List wrapper = new ListWrapper((List) value) {
+                        @Override
+                        public synchronized void handleAdd(Object o) {
+                            synchronized (this) {
+                                if (o instanceof ChannelFuture) {
+                                    inject((ChannelFuture) o);
+                                }
+                            }
+                        }
+                    };
+                    injectedLists.add(new Pair<>(field, connection));
+                    field.set(connection, wrapper);
+                    // Iterate through current list
+                    synchronized (wrapper) {
+                        for (Object o : (List) value) {
+                            if (o instanceof ChannelFuture) {
+                                inject((ChannelFuture) o);
+                            } else {
+                                break; // not the right list.
+                            }
+                        }
+                    }
+                }
+            }
+            System.setProperty("ViaVersion", getDescription().getVersion());
+        } catch (Exception e) {
+            getLogger().severe("Unable to inject handlers, are you on 1.8? ");
+            e.printStackTrace();
+        }
+    }
+
+    public boolean isBinded() {
+        try {
+            Object connection = getServerConnection();
+            if (connection == null) {
+                return false;
+            }
+            for (Field field : connection.getClass().getDeclaredFields()) {
+                field.setAccessible(true);
+                final Object value = field.get(connection);
+                if (value instanceof List) {
+                    // Inject the list
+                    synchronized (value) {
+                        for (Object o : (List) value) {
+                            if (o instanceof ChannelFuture) {
+                                return true;
+                            } else {
+                                break; // not the right list.
+                            }
+                        }
+                    }
+                }
+            }
+        } catch (Exception e) {
+        }
+        return false;
+    }
+
+    private void inject(ChannelFuture future) {
+        try {
+            ChannelHandler bootstrapAcceptor = future.channel().pipeline().first();
+            try {
+                ChannelInitializer<SocketChannel> oldInit = ReflectionUtil.get(bootstrapAcceptor, "childHandler", ChannelInitializer.class);
+                ChannelInitializer newInit = new ViaVersionInitializer(oldInit);
+
+                ReflectionUtil.set(bootstrapAcceptor, "childHandler", newInit);
+                injectedFutures.add(future);
+            } catch (NoSuchFieldException e) {
+                // let's find who to blame!
+                ClassLoader cl = bootstrapAcceptor.getClass().getClassLoader();
+                if (cl.getClass().getName().equals("org.bukkit.plugin.java.PluginClassLoader")) {
+                    PluginDescriptionFile yaml = ReflectionUtil.get(cl, "description", PluginDescriptionFile.class);
+                    throw new Exception("Unable to inject, due to " + bootstrapAcceptor.getClass().getName() + ", try without the plugin " + yaml.getName() + "?");
+                } else {
+                    throw new Exception("Unable to find childHandler, weird server version? " + bootstrapAcceptor.getClass().getName());
+                }
+
+            }
+        } catch (Exception e) {
+            getLogger().severe("Have you got late-bind enabled with something else?");
+            e.printStackTrace();
+        }
+    }
+
+    private void uninject() {
+        // TODO: Uninject from players currently online to prevent protocol lib issues.
+        for (ChannelFuture future : injectedFutures) {
+            ChannelHandler bootstrapAcceptor = future.channel().pipeline().first();
+            try {
+                ChannelInitializer<SocketChannel> oldInit = ReflectionUtil.get(bootstrapAcceptor, "childHandler", ChannelInitializer.class);
+                if (oldInit instanceof ViaVersionInitializer) {
+                    ReflectionUtil.set(bootstrapAcceptor, "childHandler", ((ViaVersionInitializer) oldInit).getOriginal());
+                }
+            } catch (Exception e) {
+                System.out.println("Failed to remove injection... reload won't work with connections sorry");
+            }
+        }
+        injectedFutures.clear();
+
+        for (Pair<Field, Object> pair : injectedLists) {
+            try {
+                Object o = pair.getKey().get(pair.getValue());
+                if (o instanceof ListWrapper) {
+                    pair.getKey().set(pair.getValue(), ((ListWrapper) o).getOriginalList());
+                }
+            } catch (IllegalAccessException e) {
+                System.out.println("Failed to remove injection... reload might not work with connections sorry");
+            }
+        }
+
+        injectedLists.clear();
+    }
+
+    @Override
+    public boolean isPorted(Player player) {
+        return isPorted(player.getUniqueId());
+    }
+
+    @Override
+    public int getPlayerVersion(@NonNull Player player) {
+        if (!isPorted(player))
+            return ProtocolRegistry.SERVER_PROTOCOL;
+        return portedPlayers.get(player.getUniqueId()).get(ProtocolInfo.class).getProtocolVersion();
+    }
+
+    @Override
+    public int getPlayerVersion(@NonNull UUID uuid) {
+        if (!isPorted(uuid))
+            return ProtocolRegistry.SERVER_PROTOCOL;
+        return portedPlayers.get(uuid).get(ProtocolInfo.class).getProtocolVersion();
+    }
+
+    @Override
+    public boolean isPorted(UUID playerUUID) {
+        return portedPlayers.containsKey(playerUUID);
+    }
+
+    @Override
+    public String getVersion() {
+        return getDescription().getVersion();
+    }
+
+    public UserConnection getConnection(UUID playerUUID) {
+        return portedPlayers.get(playerUUID);
+    }
+
+    public UserConnection getConnection(Player player) {
+        return portedPlayers.get(player.getUniqueId());
+    }
+
+    public void sendRawPacket(Player player, ByteBuf packet) throws IllegalArgumentException {
+        sendRawPacket(player.getUniqueId(), packet);
+    }
+
+    @Override
+    public void sendRawPacket(UUID uuid, ByteBuf packet) throws IllegalArgumentException {
+        if (!isPorted(uuid)) throw new IllegalArgumentException("This player is not controlled by ViaVersion!");
+        UserConnection ci = portedPlayers.get(uuid);
+        ci.sendRawPacket(packet);
+    }
+
+    @Override
+    public BossBar createBossBar(String title, BossColor color, BossStyle style) {
+        return new ViaBossBar(title, 1F, color, style);
+    }
+
+    @Override
+    public BossBar createBossBar(String title, float health, BossColor color, BossStyle style) {
+        return new ViaBossBar(title, health, color, style);
+    }
+
+    @Override
+    public boolean isDebug() {
+        return this.debug;
+    }
+
+    public void setDebug(boolean value) {
+        this.debug = value;
+    }
+
+    @Override
+    public ViaVersionCommand getCommandHandler() {
+        return commandHandler;
+    }
+
+    @Override
+    public boolean isCompatSpigotBuild() {
+        return compatSpigotBuild;
+    }
+
+    @Override
+    public SortedSet<Integer> getSupportedVersions() {
+        return ProtocolRegistry.getSupportedVersions();
+    }
+
+    @Override
+    public boolean isSpigot() {
+        return this.spigot;
+    }
+
+    public void addPortedClient(UserConnection info) {
+        portedPlayers.put(info.get(ProtocolInfo.class).getUuid(), info);
+    }
+
+    public void removePortedClient(UUID clientID) {
+        portedPlayers.remove(clientID);
+    }
+
+    public void run(final Runnable runnable, boolean wait) {
+        try {
+            Future f = Bukkit.getScheduler().callSyncMethod(Bukkit.getPluginManager().getPlugin("ViaVersion"), new Callable<Boolean>() {
+                @Override
+                public Boolean call() throws Exception {
+                    runnable.run();
+                    return true;
+                }
+            });
+            if (wait) {
+                f.get(10, TimeUnit.SECONDS);
+            }
+        } catch (Exception e) {
+            System.out.println("Failed to run task: " + e.getClass().getName());
+            if (ViaVersion.getInstance().isDebug())
+                e.printStackTrace();
+        }
+    }
+
+    public Map<UUID, UserConnection> getPortedPlayers() {
+        return portedPlayers;
+    }
+
+    public boolean handlePPS(UserConnection info) {
+        // Max PPS Checker
+        if (conf.getMaxPPS() > 0) {
+            if (info.getPacketsPerSecond() >= conf.getMaxPPS()) {
+                info.disconnect(conf.getMaxPPSKickMessage());
+                return true; // don't send current packet
+            }
+        }
+
+        // Tracking PPS Checker
+        if (conf.getMaxWarnings() > 0 && conf.getTrackingPeriod() > 0) {
+            if (info.getSecondsObserved() > conf.getTrackingPeriod()) {
+                // Reset
+                info.setWarnings(0);
+                info.setSecondsObserved(1);
+            } else {
+                info.setSecondsObserved(info.getSecondsObserved() + 1);
+                if (info.getPacketsPerSecond() >= conf.getWarningPPS()) {
+                    info.setWarnings(info.getWarnings() + 1);
+                }
+
+                if (info.getWarnings() >= conf.getMaxWarnings()) {
+                    info.disconnect(conf.getMaxWarningsKickMessage());
+                    return true; // don't send current packet
+                }
+            }
+        }
+        return false;
+    }
+}

src/main/java/us/myles/ViaVersion/api/PacketWrapper.java

@@ -0,0 +1,345 @@
+package us.myles.ViaVersion.api;
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import lombok.Getter;
+import lombok.Setter;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.remapper.ValueCreator;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+import us.myles.ViaVersion.exception.InformativeException;
+import us.myles.ViaVersion.handlers.ViaDecodeHandler;
+import us.myles.ViaVersion.util.PipelineUtil;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.LinkedList;
+import java.util.List;
+
+public class PacketWrapper {
+    private final ByteBuf inputBuffer;
+    private final UserConnection userConnection;
+    private boolean send = true;
+    @Setter
+    @Getter
+    private int id = -1;
+    private LinkedList<Pair<Type, Object>> readableObjects = new LinkedList<>();
+    private List<Pair<Type, Object>> packetValues = new ArrayList<>();
+
+    public PacketWrapper(int packetID, ByteBuf inputBuffer, UserConnection userConnection) {
+        this.id = packetID;
+        this.inputBuffer = inputBuffer;
+        this.userConnection = userConnection;
+    }
+
+    /**
+     * Get a part from the output
+     *
+     * @param type  The type of the part you wish to get.
+     * @param <T>   The return type of the type you wish to get.
+     * @param index The index of the part (relative to the type)
+     * @return The requested type or throws ArrayIndexOutOfBounds
+     * @throws Exception If it fails to find it, an exception will be thrown.
+     */
+    public <T> T get(Type<T> type, int index) throws Exception {
+        int currentIndex = 0;
+        for (Pair<Type, Object> packetValue : packetValues) {
+            if (packetValue.getKey() == type) { // Ref check
+                if (currentIndex == index) {
+                    return (T) packetValue.getValue();
+                }
+                currentIndex++;
+            }
+        }
+
+        Exception e = new ArrayIndexOutOfBoundsException("Could not find type " + type.getTypeName() + " at " + index);
+        throw new InformativeException(e).set("Type", type.getTypeName()).set("Index", index).set("Packet ID", getId()).set("Data", packetValues);
+    }
+
+    /**
+     * Check if a type is at an index
+     *
+     * @param type  The type of the part you wish to get.
+     * @param index The index of the part (relative to the type)
+     * @return True if the type is at the index
+     */
+    public boolean is(Type type, int index) {
+        int currentIndex = 0;
+        for (Pair<Type, Object> packetValue : packetValues) {
+            if (packetValue.getKey() == type) { // Ref check
+                if (currentIndex == index) {
+                    return true;
+                }
+                currentIndex++;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Set a currently existing part in the output
+     *
+     * @param type  The type of the part you wish to set.
+     * @param <T>   The return type of the type you wish to set.
+     * @param index The index of the part (relative to the type)
+     * @param value The value of the part you wish to set it to.
+     * @throws Exception If it fails to set it, an exception will be thrown.
+     */
+    public <T> void set(Type<T> type, int index, T value) throws Exception {
+        int currentIndex = 0;
+        for (Pair<Type, Object> packetValue : packetValues) {
+            if (packetValue.getKey() == type) { // Ref check
+                if (currentIndex == index) {
+                    packetValue.setValue(value);
+                    return;
+                }
+                currentIndex++;
+            }
+        }
+        Exception e = new ArrayIndexOutOfBoundsException("Could not find type " + type.getTypeName() + " at " + index);
+        throw new InformativeException(e).set("Type", type.getTypeName()).set("Index", index).set("Packet ID", getId());
+    }
+
+    /**
+     * Read a type from the input.
+     *
+     * @param type The type you wish to read
+     * @param <T>  The return type of the type you wish to read.
+     * @return The requested type
+     * @throws Exception If it fails to read
+     */
+    public <T> T read(Type<T> type) throws Exception {
+        if (type == Type.NOTHING) return null;
+        if (readableObjects.isEmpty()) {
+            Preconditions.checkNotNull(inputBuffer, "This packet does not have an input buffer.");
+            // We could in the future log input read values, but honestly for things like bulk maps, mem waste D:
+            try {
+                return type.read(inputBuffer);
+            } catch (Exception e) {
+                throw new InformativeException(e).set("Type", type.getTypeName()).set("Packet ID", getId()).set("Data", packetValues);
+            }
+        } else {
+            Pair<Type, Object> read = readableObjects.poll();
+            if (read.getKey().equals(type) || (type.getBaseClass().equals(read.getKey().getBaseClass()) && type.getOutputClass().equals(read.getKey().getOutputClass()))) {
+                return (T) read.getValue();
+            } else {
+                if (type == Type.NOTHING) {
+                    return read(type); // retry
+                } else {
+                    Exception e = new IOException("Unable to read type " + type.getTypeName() + ", found " + read.getKey().getTypeName());
+                    throw new InformativeException(e).set("Type", type.getTypeName()).set("Packet ID", getId()).set("Data", packetValues);
+                }
+            }
+        }
+    }
+
+    /**
+     * Write a type to the output.
+     *
+     * @param type  The type to write.
+     * @param <T>   The return type of the type you wish to write.
+     * @param value The value of the type to write.
+     */
+    public <T> void write(Type<T> type, T value) {
+        if (value != null) {
+            if (!type.getOutputClass().isAssignableFrom(value.getClass())) {
+                // attempt conversion
+                if (type instanceof TypeConverter) {
+                    value = (T) ((TypeConverter) type).from(value);
+                } else {
+                    System.out.println("Possible type mismatch: " + value.getClass().getName() + " -> " + type.getOutputClass());
+                }
+            }
+        }
+        packetValues.add(new Pair<Type, Object>(type, value));
+    }
+
+    /**
+     * Take a value from the input and write to the output.
+     *
+     * @param type The type to read and write.
+     * @param <T>  The return type of the type you wish to pass through.
+     * @return The type which was read/written.
+     * @throws Exception If it failed to read or write
+     */
+    public <T> T passthrough(Type<T> type) throws Exception {
+        T value = read(type);
+        write(type, value);
+        return value;
+    }
+
+    /**
+     * Take all the inputs and write them to the output.
+     *
+     * @throws Exception If it failed to read or write
+     */
+    public void passthroughAll() throws Exception {
+        // Copy previous objects
+        packetValues.addAll(readableObjects);
+        readableObjects.clear();
+        // If the buffer has readable bytes, copy them.
+        if (inputBuffer.readableBytes() > 0) {
+            passthrough(Type.REMAINING_BYTES);
+        }
+    }
+
+    /**
+     * Write the current output to a buffer.
+     *
+     * @param buffer The buffer to write to.
+     * @throws Exception Throws an exception if it fails to write a value.
+     */
+    public void writeToBuffer(ByteBuf buffer) throws Exception {
+        if (id != -1) {
+            Type.VAR_INT.write(buffer, id);
+        }
+        if (readableObjects.size() > 0) {
+            packetValues.addAll(readableObjects);
+        }
+
+        int index = 0;
+        for (Pair<Type, Object> packetValue : packetValues) {
+            try {
+                Object value = packetValue.getValue();
+                if (value != null) {
+                    if (!packetValue.getKey().getOutputClass().isAssignableFrom(value.getClass())) {
+                        // attempt conversion
+                        if (packetValue.getKey() instanceof TypeConverter) {
+                            value = ((TypeConverter) packetValue.getKey()).from(value);
+                        } else {
+                            System.out.println("Possible type mismatch: " + value.getClass().getName() + " -> " + packetValue.getKey().getOutputClass());
+                        }
+                    }
+                }
+                packetValue.getKey().write(buffer, value);
+            } catch (Exception e) {
+                throw new InformativeException(e).set("Index", index).set("Type", packetValue.getKey().getTypeName()).set("Packet ID", getId()).set("Data", packetValues);
+            }
+            index++;
+        }
+        writeRemaining(buffer);
+    }
+
+    /**
+     * Clear the input buffer / readable objects
+     */
+    public void clearInputBuffer() {
+        if (inputBuffer != null)
+            inputBuffer.clear();
+        readableObjects.clear(); // :(
+    }
+
+    /**
+     * Clear the packet, used if you have to change the packet completely
+     */
+    public void clearPacket() {
+        clearInputBuffer();
+        packetValues.clear();
+    }
+
+    private void writeRemaining(ByteBuf output) {
+        if (inputBuffer != null) {
+            output.writeBytes(inputBuffer);
+        }
+    }
+
+    /**
+     * Send this packet to the associated user.
+     * Be careful not to send packets twice.
+     * (Sends it after current)
+     *
+     * @throws Exception if it fails to write
+     */
+    public void send() throws Exception {
+        if (!isCancelled()) {
+            ByteBuf output = inputBuffer == null ? Unpooled.buffer() : inputBuffer.alloc().buffer();
+            writeToBuffer(output);
+            user().sendRawPacket(output);
+        }
+    }
+
+    /**
+     * Create a new packet for the target of this packet.
+     *
+     * @param packetID The ID of the new packet
+     * @return The newly created packet wrapper
+     */
+    public PacketWrapper create(int packetID) {
+        return new PacketWrapper(packetID, null, user());
+    }
+
+    /**
+     * Create a new packet with values.
+     *
+     * @param packetID The ID of the new packet
+     * @param init     A ValueCreator to write to the packet.
+     * @return The newly created packet wrapper
+     * @throws Exception If it failed to write the values from the ValueCreator.
+     */
+    public PacketWrapper create(int packetID, ValueCreator init) throws Exception {
+        PacketWrapper wrapper = create(packetID);
+        init.write(wrapper);
+        return wrapper;
+    }
+
+    /**
+     * Cancel this packet from sending
+     */
+    public void cancel() {
+        this.send = false;
+    }
+
+    /**
+     * Check if this packet is cancelled.
+     *
+     * @return True if the packet won't be sent.
+     */
+    public boolean isCancelled() {
+        return !this.send;
+    }
+
+    /**
+     * Get the user associated with this Packet
+     *
+     * @return The user
+     */
+    public UserConnection user() {
+        return this.userConnection;
+    }
+
+    /**
+     * Reset the reader, so that it can be read again.
+     */
+    public void resetReader() {
+        this.readableObjects.addAll(packetValues);
+        this.packetValues.clear();
+    }
+
+    /**
+     * Send the current packet to the server.
+     * (Ensure the ID is suitable for the server version)
+     *
+     * @throws Exception If it failed to write
+     */
+    public void sendToServer() throws Exception {
+        if (!isCancelled()) {
+            ByteBuf output = inputBuffer == null ? Unpooled.buffer() : inputBuffer.alloc().buffer();
+            Type.VAR_INT.write(output, ViaDecodeHandler.PASSTHROUGH_ID); // Pass through
+
+            writeToBuffer(output);
+
+            PipelineUtil.getContextBefore("decompress", user().getChannel().pipeline()).fireChannelRead(output);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "PacketWrapper{" +
+                "packetValues=" + packetValues +
+                ", readableObjects=" + readableObjects +
+                ", id=" + id +
+                '}';
+    }
+}

src/main/java/us/myles/ViaVersion/api/Pair.java

@@ -0,0 +1,23 @@
+package us.myles.ViaVersion.api;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.Setter;
+
+@Getter
+@Setter
+@EqualsAndHashCode
+public class Pair<X, Y> {
+    private X key;
+    private Y value;
+
+    public Pair(X key, Y value) {
+        this.key = key;
+        this.value = value;
+    }
+
+    @Override
+    public String toString() {
+        return "Pair{" + key + ", " + value + '}';
+    }
+}

src/main/java/us/myles/ViaVersion/api/ViaVersion.java

@@ -0,0 +1,19 @@
+package us.myles.ViaVersion.api;
+
+import lombok.Getter;
+import org.apache.commons.lang.Validate;
+import us.myles.ViaVersion.ViaVersionPlugin;
+
+public class ViaVersion {
+
+    @Getter
+    private static ViaVersionAPI instance;
+    @Getter
+    private static ViaVersionConfig config;
+
+    public static void setInstance(ViaVersionPlugin plugin) {
+        Validate.isTrue(instance == null, "Instance is already set");
+        ViaVersion.instance = plugin;
+        ViaVersion.config = plugin.getConf();
+    }
+}

src/main/java/us/myles/ViaVersion/api/ViaVersionAPI.java

@@ -0,0 +1,128 @@
+package us.myles.ViaVersion.api;
+
+import io.netty.buffer.ByteBuf;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.api.boss.BossBar;
+import us.myles.ViaVersion.api.boss.BossColor;
+import us.myles.ViaVersion.api.boss.BossStyle;
+import us.myles.ViaVersion.api.command.ViaVersionCommand;
+
+import java.util.SortedSet;
+import java.util.UUID;
+
+public interface ViaVersionAPI {
+    /**
+     * Is the player connection modified by ViaVersion?
+     *
+     * @param player Bukkit player object
+     * @return True if the client is modified (At the moment it also means version 1.9 and higher)
+     */
+    boolean isPorted(Player player);
+
+    /**
+     * Get protocol number from a player
+     *
+     * @param player Bukkit player object
+     * @return Protocol ID, For example (47=1.8-1.8.8, 107=1.9, 108=1.9.1)
+     */
+    int getPlayerVersion(Player player);
+
+    /**
+     * Get protocol number from a player
+     *
+     * @param uuid UUID of a player
+     * @return Protocol ID, For example (47=1.8-1.8.8, 107=1.9, 108=1.9.1)
+     */
+    int getPlayerVersion(UUID uuid);
+
+    /**
+     * Is player using 1.9?
+     *
+     * @param playerUUID UUID of a player
+     * @return True if the client is on 1.9
+     */
+    boolean isPorted(UUID playerUUID);
+
+    /**
+     * Get the version of the plugin
+     *
+     * @return Plugin version
+     */
+    String getVersion();
+
+    /**
+     * Send a raw packet to the player (Use new IDs)
+     *
+     * @param player The player to send packet
+     * @param packet The packet, you need a VarInt ID then the packet contents.
+     * @throws IllegalArgumentException If not on 1.9 throws IllegalArg
+     */
+    void sendRawPacket(Player player, ByteBuf packet) throws IllegalArgumentException;
+
+    /**
+     * Send a raw packet to the player (Use new IDs)
+     *
+     * @param uuid   The uuid from the player to send packet
+     * @param packet The packet, you need a VarInt ID then the packet contents.
+     * @throws IllegalArgumentException If not on 1.9 throws IllegalArg
+     */
+    void sendRawPacket(UUID uuid, ByteBuf packet) throws IllegalArgumentException;
+
+    /**
+     * Create a new bossbar instance
+     *
+     * @param title The title
+     * @param color The color
+     * @param style The style
+     * @return Bossbar instance
+     */
+    BossBar createBossBar(String title, BossColor color, BossStyle style);
+
+    /**
+     * Create a new bossbar instance
+     *
+     * @param title  The title
+     * @param health Number between 0 and 1
+     * @param color  The color
+     * @param style  The style
+     * @return Bossbar instance
+     */
+    BossBar createBossBar(String title, float health, BossColor color, BossStyle style);
+
+    /**
+     * Get if global debug is enabled
+     *
+     * @return true if debug is enabled
+     */
+    boolean isDebug();
+
+    /**
+     * Get ViaVersions command handler
+     *
+     * @return command handler
+     */
+    ViaVersionCommand getCommandHandler();
+
+    /**
+     * Get if this version is a compatibility build for spigot.
+     * Eg. 1.9.1 / 1.9.2 allow certain versions to connect
+     *
+     * @return True if it is
+     */
+    boolean isCompatSpigotBuild();
+
+    /**
+     * Get the supported protocol versions
+     *
+     * @return a list of protocol versions
+     */
+    SortedSet<Integer> getSupportedVersions();
+
+    /**
+     * Gets if the server uses spigot
+     *
+     * Note: Will only work after ViaVersion load
+     * @return True if spigot
+     */
+    boolean isSpigot();
+}

src/main/java/us/myles/ViaVersion/api/ViaVersionConfig.java

@@ -0,0 +1,175 @@
+package us.myles.ViaVersion.api;
+
+public interface ViaVersionConfig {
+
+    /**
+     * Get if the plugin should check for updates
+     *
+     * @return true if update checking is enabled
+     */
+    boolean isCheckForUpdates();
+
+    /**
+     * Get if collision preventing for players is enabled
+     *
+     * @return true if collision preventing is enabled
+     */
+    boolean isPreventCollision();
+
+    /**
+     * Get if 1.9 & 1.10 clients are shown the new effect indicator in the top-right corner
+     *
+     * @return true if the using of the new effect indicator is enabled
+     */
+    boolean isNewEffectIndicator();
+
+    /**
+     * Get if 1.9 & 1.10 clients are shown the new death message on the death screen
+     *
+     * @return true if enabled
+     */
+    boolean isShowNewDeathMessages();
+
+    /**
+     * Get if metadata errors will be suppressed
+     *
+     * @return true if metadata errors suppression is enabled
+     */
+    boolean isSuppressMetadataErrors();
+
+    /**
+     * Get if blocking in 1.9 & 1.10 appears as a player holding a shield
+     *
+     * @return true if shield blocking is enabled
+     */
+    boolean isShieldBlocking();
+
+    /**
+     * Get if armor stand positions are fixed so holograms show up at the correct height in 1.9 & 1.10
+     *
+     * @return true if hologram patching is enabled
+     */
+    boolean isHologramPatch();
+
+    /**
+     * Get if boss bars are fixed for 1.9 & 1.10 clients
+     *
+     * @return true if boss bar patching is enabled
+     */
+    boolean isBossbarPatch();
+
+    /**
+     * Get if the boss bars for 1.9 & 1.10 clients are being stopped from flickering
+     * This will keep all boss bars on 100% (not recommended)
+     *
+     * @return true if boss bar anti flickering is enabled
+     */
+    boolean isBossbarAntiflicker();
+
+    /**
+     * Get if unknown entity errors will be suppressed
+     *
+     * @return true if boss bar patching is enabled
+     */
+    @Deprecated
+    boolean isUnknownEntitiesSuppressed();
+
+    /**
+     * Get the vertical offset armor stands are being moved with when the hologram patch is enabled
+     *
+     * @return the vertical offset holograms will be moved with
+     */
+    double getHologramYOffset();
+
+    /**
+     * Get if players will be automatically put in the same team when collision preventing is enabled
+     *
+     * @return true if automatic teaming is enabled
+     */
+    boolean isAutoTeam();
+
+    /**
+     * Get if our block break patch is enabled to prevent weird ghost glitches.
+     *
+     * @return true if it is enabled.
+     */
+    @Deprecated
+    boolean isBlockBreakPatch();
+
+    /**
+     * Get the maximum number of packets a client can send per second.
+     *
+     * @return The number of packets a client can send per second.
+     */
+    int getMaxPPS();
+
+    /**
+     * Get the kick message sent if the user hits the max packets per second.
+     *
+     * @return Kick message, with colour codes using '&'
+     */
+    String getMaxPPSKickMessage();
+
+    /**
+     * The time in seconds that should be tracked for warnings
+     *
+     * @return Time in seconds that should be tracked for warnings
+     */
+    int getTrackingPeriod();
+
+    /**
+     * The number of packets per second to count as a warning
+     *
+     * @return The number of packets per second to count as a warning.
+     */
+    int getWarningPPS();
+
+    /**
+     * Get the maximum number of warnings the client can have in the interval
+     *
+     * @return The number of packets a client can send per second.
+     */
+    int getMaxWarnings();
+
+    /**
+     * Get the kick message sent if the user goes over the warnings in the interval
+     *
+     * @return Kick message, with colour codes using '&'
+     */
+    String getMaxWarningsKickMessage();
+
+    /**
+     * Is anti-xray enabled?
+     *
+     * @return A boolean
+     */
+    boolean isAntiXRay();
+
+    /**
+     * Send supported versions in the status response packet
+     *
+     * @return If true, enabled
+     */
+    boolean isSendSupportedVersions();
+
+    /**
+     * Stimulate the player tick
+     *
+     * @return if true, enabled
+     */
+    boolean isStimulatePlayerTick();
+
+    /**
+     * Use the item cache to prevent high resource usage
+     *
+     * @return if true, enabled
+     */
+    boolean isItemCache();
+
+    /**
+     * Use the NMS player ticking
+     *
+     * @return if true, enabled
+     */
+    boolean isNMSPlayerTicking();
+}

src/main/java/us/myles/ViaVersion/api/boss/BossBar.java

@@ -0,0 +1,150 @@
+package us.myles.ViaVersion.api.boss;
+
+import org.bukkit.entity.Player;
+
+import java.util.Set;
+import java.util.UUID;
+
+public interface BossBar {
+    /**
+     * Get the current title
+     *
+     * @return the title
+     */
+    String getTitle();
+
+    /**
+     * Change the title
+     *
+     * @param title Title can be in either JSON or just text
+     * @return The BossBar object
+     */
+    BossBar setTitle(String title);
+
+    /**
+     * Get the health
+     *
+     * @return float between 0F - 1F
+     */
+    float getHealth();
+
+    /**
+     * Change the health
+     *
+     * @param health this float has to be between 0F - 1F
+     * @return The BossBar object
+     */
+    BossBar setHealth(float health);
+
+    /**
+     * Get the bossbar color
+     *
+     * @return The colour
+     */
+    BossColor getColor();
+
+    /**
+     * Yay colors!
+     *
+     * @param color Whatever color you want!
+     * @return The BossBar object
+     */
+    BossBar setColor(BossColor color);
+
+    /**
+     * Get the bosbar style
+     *
+     * @return BossStyle
+     */
+    BossStyle getStyle();
+
+    /**
+     * Change the bosbar style
+     *
+     * @param style BossStyle
+     * @return The BossBar object
+     */
+    BossBar setStyle(BossStyle style);
+
+    /**
+     * Show the bossbar to a player.
+     *
+     * @param player The player
+     * @return The BossBar object
+     */
+    BossBar addPlayer(Player player);
+
+    /**
+     * Show the bossbar to a player (uuid)
+     *
+     * @param player uuid of the player
+     * @return The BossBar object
+     */
+    BossBar addPlayer(UUID player);
+
+    /**
+     * add multiple players
+     *
+     * @param players list of players
+     * @return The BossBar object
+     */
+    BossBar addPlayers(Player... players);
+
+    /**
+     * Remove the bossbar from a player
+     *
+     * @param player The player
+     * @return The BossBar object
+     */
+    BossBar removePlayer(Player player);
+
+    /**
+     * Add flags
+     *
+     * @param flag The flag to add
+     * @return The BossBar object
+     */
+    BossBar addFlag(BossFlag flag);
+
+    /**
+     * Remove flags.
+     *
+     * @param flag The flag to remove
+     * @return The BossBar object
+     */
+    BossBar removeFlag(BossFlag flag);
+
+    /**
+     * @param flag The flag to check against
+     * @return True if it has the flag
+     */
+    boolean hasFlag(BossFlag flag);
+
+    /**
+     * Get players
+     *
+     * @return UUIDS from players (sorry I lied)
+     */
+    Set<UUID> getPlayers();
+
+    /**
+     * Show the bossbar to everyone (In the getPlayer set)
+     *
+     * @return The BossBar object
+     */
+    BossBar show();
+
+    /**
+     * Hide the bossbar from everyone (In the getPlayer set)
+     *
+     * @return The BossBar object
+     */
+    BossBar hide();
+
+    /**
+     * Is it visible?
+     *
+     * @return visibility changable with show() and hide()
+     */
+    boolean isVisible();
+}

src/main/java/us/myles/ViaVersion/api/boss/BossColor.java

@@ -0,0 +1,18 @@
+package us.myles.ViaVersion.api.boss;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum BossColor {
+    PINK(0),
+    BLUE(1),
+    RED(2),
+    GREEN(3),
+    YELLOW(4),
+    PURPLE(5),
+    WHITE(6);
+
+    private final int id;
+}

src/main/java/us/myles/ViaVersion/api/boss/BossFlag.java

@@ -0,0 +1,13 @@
+package us.myles.ViaVersion.api.boss;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum BossFlag {
+    DARKEN_SKY(1),
+    PLAY_BOSS_MUSIC(2);
+
+    private final int id;
+}

src/main/java/us/myles/ViaVersion/api/boss/BossStyle.java

@@ -0,0 +1,16 @@
+package us.myles.ViaVersion.api.boss;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+@RequiredArgsConstructor
+@Getter
+public enum BossStyle {
+    SOLID(0),
+    SEGMENTED_6(1),
+    SEGMENTED_10(2),
+    SEGMENTED_12(3),
+    SEGMENTED_20(4);
+
+    private final int id;
+}

src/main/java/us/myles/ViaVersion/api/command/ViaSubCommand.java

@@ -0,0 +1,77 @@
+package us.myles.ViaVersion.api.command;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.commands.ViaCommandHandler;
+
+import java.util.Collections;
+import java.util.List;
+
+public abstract class ViaSubCommand {
+    /**
+     * Subcommand name
+     *
+     * @return The command name
+     */
+    public abstract String name();
+
+    /**
+     * subcommand description, this'll show in /viaversion list
+     *
+     * @return The command description
+     */
+    public abstract String description();
+
+    /**
+     * Usage example:
+     * "playerversion [name]"
+     *
+     * @return The command usage
+     */
+    public String usage() {
+        return name();
+    }
+
+    /**
+     * Permission, null for everyone
+     *
+     * @return The permission required to use the command
+     */
+    public String permission() {
+        return "viaversion.admin";
+    }
+
+    /**
+     * Gets triggered on execution
+     *
+     * @param sender Command sender
+     * @param args   Arguments
+     * @return command executed succesfully if false, show usage
+     */
+    public abstract boolean execute(CommandSender sender, String[] args);
+
+    /**
+     * Yay, possibility to implement tab-completion
+     *
+     * @param sender Command sender
+     * @param args   args
+     * @return tab complete possibilities
+     */
+    public List<String> onTabComplete(CommandSender sender, String[] args) {
+        return Collections.emptyList();
+    }
+    
+    public String color(String s) {
+        return ViaCommandHandler.color(s);
+    }
+
+    /**
+     * Send message formatted / colored
+     *
+     * @param sender  command sender
+     * @param message string message
+     * @param args    optional objects
+     */
+    public void sendMessage(CommandSender sender, String message, Object... args) {
+        ViaCommandHandler.sendMessage(sender, message, args);
+    }
+}

src/main/java/us/myles/ViaVersion/api/command/ViaVersionCommand.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.api.command;
+
+public interface ViaVersionCommand {
+    /**
+     * Register your own subcommand inside ViaVersion
+     *
+     * @param command Your own SubCommand instance to handle it.
+     * @throws Exception throws an exception when the subcommand already exists or if it's not valid, example: spacee
+     */
+    void registerSubCommand(ViaSubCommand command) throws Exception;
+
+    /**
+     * Check if a subcommand is registered.
+     *
+     * @param name Subcommand name
+     * @return true if it exists
+     */
+    boolean hasSubCommand(String name);
+
+    /**
+     * Get subcommand instance by name
+     *
+     * @param name subcommand name
+     * @return ViaSubCommand instance
+     */
+    ViaSubCommand getSubCommand(String name);
+}

src/main/java/us/myles/ViaVersion/api/data/StoredObject.java

@@ -0,0 +1,11 @@
+package us.myles.ViaVersion.api.data;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@Getter(AccessLevel.PROTECTED)
+@AllArgsConstructor
+public class StoredObject {
+    private UserConnection user;
+}

src/main/java/us/myles/ViaVersion/api/data/UserConnection.java

@@ -0,0 +1,150 @@
+package us.myles.ViaVersion.api.data;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.channel.ChannelHandler;
+import io.netty.channel.socket.SocketChannel;
+import lombok.Data;
+import org.bukkit.Bukkit;
+import org.bukkit.ChatColor;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+@Data
+public class UserConnection {
+    private final SocketChannel channel;
+    Map<Class, StoredObject> storedObjects = new ConcurrentHashMap<>();
+    private boolean active = true;
+    private boolean pendingDisconnect = false;
+    private Object lastPacket;
+    private long sentPackets = 0L;
+    private long receivedPackets = 0L;
+    // Used for tracking pps
+    private long startTime = 0L;
+    private long intervalPackets = 0L;
+    private long packetsPerSecond = -1L;
+    // Used for handling warnings (over time)
+    private int secondsObserved = 0;
+    private int warnings = 0;
+
+
+    public UserConnection(SocketChannel socketChannel) {
+        this.channel = socketChannel;
+    }
+
+    /**
+     * Get an object from the storage
+     *
+     * @param objectClass The class of the object to get
+     * @param <T>         The type of the class you want to get.
+     * @return The requested object
+     */
+    public <T extends StoredObject> T get(Class<T> objectClass) {
+        return (T) storedObjects.get(objectClass);
+    }
+
+    /**
+     * Check if the storage has an object
+     *
+     * @param objectClass The object class to check
+     * @return True if the object is in the storage
+     */
+    public boolean has(Class<? extends StoredObject> objectClass) {
+        return storedObjects.containsKey(objectClass);
+    }
+
+    /**
+     * Put an object into the stored objects based on class
+     *
+     * @param object The object to store.
+     */
+    public void put(StoredObject object) {
+        storedObjects.put(object.getClass(), object);
+    }
+
+    /**
+     * Send a raw packet to the player
+     *
+     * @param packet        The raw packet to send
+     * @param currentThread Should it run in the same thread
+     */
+    public void sendRawPacket(final ByteBuf packet, boolean currentThread) {
+        final ChannelHandler handler = channel.pipeline().get("encoder");
+        if (currentThread) {
+            channel.pipeline().context(handler).writeAndFlush(packet);
+        } else {
+            channel.eventLoop().submit(new Runnable() {
+                @Override
+                public void run() {
+                    channel.pipeline().context(handler).writeAndFlush(packet);
+                }
+            });
+        }
+    }
+
+    /**
+     * Send a raw packet to the player (netty thread)
+     *
+     * @param packet The packet to send
+     */
+    public void sendRawPacket(final ByteBuf packet) {
+        sendRawPacket(packet, false);
+    }
+
+    /**
+     * Used for incrementing the number of packets sent to the client
+     */
+    public void incrementSent() {
+        this.sentPackets++;
+    }
+
+    /**
+     * Used for incrementing the number of packets received from the client
+     *
+     * @return True if the interval has reset
+     */
+    public boolean incrementReceived() {
+        // handle stats
+        Long diff = System.currentTimeMillis() - startTime;
+        if (diff >= 1000) {
+            packetsPerSecond = intervalPackets;
+            startTime = System.currentTimeMillis();
+            intervalPackets = 1;
+            return true;
+        } else {
+            intervalPackets++;
+        }
+        // increase total
+        this.receivedPackets++;
+        return false;
+    }
+
+    /**
+     * Disconnect a connection
+     *
+     * @param reason The reason to use, not used if player is not active.
+     */
+    public void disconnect(final String reason) {
+        if (!getChannel().isOpen()) return;
+        if (pendingDisconnect) return;
+        pendingDisconnect = true;
+        if (get(ProtocolInfo.class).getUuid() != null) {
+            final UUID uuid = get(ProtocolInfo.class).getUuid();
+            if (Bukkit.getPlayer(uuid) != null) {
+                Bukkit.getScheduler().runTask(Bukkit.getPluginManager().getPlugin("ViaVersion"), new Runnable() {
+                    @Override
+                    public void run() {
+                        Player player = Bukkit.getPlayer(uuid);
+                        if (player != null)
+                            player.kickPlayer(ChatColor.translateAlternateColorCodes('&', reason));
+                    }
+                });
+                return;
+            }
+        }
+        getChannel().close(); // =)
+    }
+}

src/main/java/us/myles/ViaVersion/api/minecraft/Position.java

@@ -0,0 +1,16 @@
+package us.myles.ViaVersion.api.minecraft;
+
+import lombok.AllArgsConstructor;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.ToString;
+
+@AllArgsConstructor
+@Getter
+@ToString
+@EqualsAndHashCode
+public class Position {
+    private Long x;
+    private Long y;
+    private Long z;
+}

src/main/java/us/myles/ViaVersion/api/minecraft/chunks/Chunk.java

@@ -0,0 +1,38 @@
+package us.myles.ViaVersion.api.minecraft.chunks;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+import lombok.ToString;
+
+@RequiredArgsConstructor
+@Getter
+@ToString
+public class Chunk {
+    private final int x;
+    private final int z;
+    private final boolean groundUp;
+    private final int primaryBitmask;
+    private final ChunkSection[] sections;
+    private final byte[] biomeData;
+    private boolean unloadPacket = false;
+
+    /**
+     * Chunk unload.
+     *
+     * @param x coord
+     * @param z coord
+     */
+    public Chunk(int x, int z) {
+        this(x, z, true, 0, new ChunkSection[16], null);
+        this.unloadPacket = true;
+    }
+
+    /**
+     * Does this chunk have biome data
+     *
+     * @return True if the chunk has biome data
+     */
+    public boolean hasBiomeData() {
+        return biomeData != null && groundUp;
+    }
+}

src/main/java/us/myles/ViaVersion/api/minecraft/chunks/ChunkSection.java

@@ -0,0 +1,191 @@
+package us.myles.ViaVersion.api.minecraft.chunks;
+
+import com.google.common.collect.Lists;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.util.List;
+
+public class ChunkSection {
+    /**
+     * Size (dimensions) of blocks in a chunk section.
+     */
+    public static final int SIZE = 16 * 16 * 16; // width * depth * height
+    /**
+     * Length of the sky and block light nibble arrays.
+     */
+    public static final int LIGHT_LENGTH = 16 * 16 * 16 / 2; // size * size * size / 2 (nibble bit count)
+    /**
+     * Length of the block data array.
+     */
+
+    private final List<Integer> palette = Lists.newArrayList();
+    private final int[] blocks;
+    private final NibbleArray blockLight;
+    private NibbleArray skyLight;
+
+    public ChunkSection() {
+        this.blocks = new int[SIZE];
+        this.blockLight = new NibbleArray(SIZE);
+        palette.add(0); // AIR
+    }
+
+    /**
+     * Set a block in the chunk
+     *
+     * @param x    Block X
+     * @param y    Block Y
+     * @param z    Block Z
+     * @param type The type of the block
+     * @param data The data value of the block
+     */
+    public void setBlock(int x, int y, int z, int type, int data) {
+        setBlock(index(x, y, z), type, data);
+    }
+
+    /**
+     * Set a block in the chunk based on the index
+     *
+     * @param idx  Index
+     * @param type The type of the block
+     * @param data The data value of the block
+     */
+    public void setBlock(int idx, int type, int data) {
+        int hash = type << 4 | (data & 0xF);
+        int index = palette.indexOf(hash);
+        if (index == -1) {
+            index = palette.size();
+            palette.add(hash);
+        }
+
+        blocks[idx] = index;
+    }
+
+    /**
+     * Set the block light array
+     *
+     * @param data The value to set the block light to
+     */
+    public void setBlockLight(byte[] data) {
+        blockLight.setHandle(data);
+    }
+
+    /**
+     * Set the sky light array
+     *
+     * @param data The value to set the sky light to
+     */
+    public void setSkyLight(byte[] data) {
+        if (data.length != LIGHT_LENGTH) throw new IllegalArgumentException("Data length != " + LIGHT_LENGTH);
+        this.skyLight = new NibbleArray(data);
+    }
+
+    private int index(int x, int y, int z) {
+        return z << 8 | y << 4 | x;
+    }
+
+    /**
+     * Write the blocks to a buffer.
+     *
+     * @param output The buffer to write to.
+     * @throws Exception Throws if it failed to write.
+     */
+    public void writeBlocks(ByteBuf output) throws Exception {
+        // Write bits per block
+        int bitsPerBlock = 4;
+        while (palette.size() > 1 << bitsPerBlock) {
+            bitsPerBlock += 1;
+        }
+        long maxEntryValue = (1L << bitsPerBlock) - 1;
+        output.writeByte(bitsPerBlock);
+
+        // Write pallet (or not)
+        Type.VAR_INT.write(output, palette.size());
+        for (int mappedId : palette) {
+            Type.VAR_INT.write(output, mappedId);
+        }
+
+        int length = (int) Math.ceil(SIZE * bitsPerBlock / 64.0);
+        Type.VAR_INT.write(output, length);
+        long[] data = new long[length];
+        for (int index = 0; index < blocks.length; index++) {
+            int value = blocks[index];
+            int bitIndex = index * bitsPerBlock;
+            int startIndex = bitIndex / 64;
+            int endIndex = ((index + 1) * bitsPerBlock - 1) / 64;
+            int startBitSubIndex = bitIndex % 64;
+            data[startIndex] = data[startIndex] & ~(maxEntryValue << startBitSubIndex) | ((long) value & maxEntryValue) << startBitSubIndex;
+            if (startIndex != endIndex) {
+                int endBitSubIndex = 64 - startBitSubIndex;
+                data[endIndex] = data[endIndex] >>> endBitSubIndex << endBitSubIndex | ((long) value & maxEntryValue) >> endBitSubIndex;
+            }
+        }
+        for (long l : data) {
+            Type.LONG.write(output, l);
+        }
+    }
+
+    /**
+     * Write the block light to a buffer
+     *
+     * @param output The buffer to write to
+     */
+    public void writeBlockLight(ByteBuf output) {
+        output.writeBytes(blockLight.getHandle());
+    }
+
+    /**
+     * Write the sky light to a buffer
+     *
+     * @param output The buffer to write to
+     */
+    public void writeSkyLight(ByteBuf output) {
+        output.writeBytes(skyLight.getHandle());
+    }
+
+    /**
+     * Check if sky light is present
+     *
+     * @return True if skylight is present
+     */
+    public boolean hasSkyLight() {
+        return skyLight != null;
+    }
+
+    /**
+     * Get expected size of this chunk section.
+     *
+     * @return Amount of bytes sent by this section
+     * @throws Exception If it failed to calculate bits properly
+     */
+    public int getExpectedSize() throws Exception {
+        int bitsPerBlock = palette.size() > 255 ? 16 : 8;
+        int bytes = 1; // bits per block
+        bytes += paletteBytes(); // palette
+        bytes += countBytes(bitsPerBlock == 16 ? SIZE * 2 : SIZE); // block data length
+        bytes += (palette.size() > 255 ? 2 : 1) * SIZE; // block data
+        bytes += LIGHT_LENGTH; // block light
+        bytes += hasSkyLight() ? LIGHT_LENGTH : 0; // sky light
+        return bytes;
+    }
+
+    private int paletteBytes() throws Exception {
+        // Count bytes used by pallet
+        int bytes = countBytes(palette.size());
+        for (int mappedId : palette) {
+            bytes += countBytes(mappedId);
+        }
+        return bytes;
+    }
+
+    private int countBytes(int value) throws Exception {
+        // Count amount of bytes that would be sent if the value were sent as a VarInt
+        ByteBuf buf = Unpooled.buffer();
+        Type.VAR_INT.write(buf, value);
+        buf.readerIndex(0);
+        int bitCount = buf.readableBytes();
+        buf.release();
+        return bitCount;
+    }
+}

src/main/java/us/myles/ViaVersion/api/minecraft/chunks/NibbleArray.java

@@ -0,0 +1,127 @@
+package us.myles.ViaVersion.api.minecraft.chunks;
+
+import java.util.Arrays;
+
+public class NibbleArray {
+    private final byte[] handle;
+
+    public NibbleArray(int length) {
+        if (length == 0 || length % 2 != 0) {
+            throw new IllegalArgumentException("Length of nibble array must be a positive number dividable by 2!");
+        }
+
+        this.handle = new byte[length / 2];
+    }
+
+    public NibbleArray(byte[] handle) {
+        if (handle.length == 0 || handle.length % 2 != 0) {
+            throw new IllegalArgumentException("Length of nibble array must be a positive number dividable by 2!");
+        }
+
+        this.handle = handle;
+    }
+
+    /**
+     * Get the value at a desired X, Y, Z
+     *
+     * @param x Block X
+     * @param y Block Y
+     * @param z Block Z
+     * @return The value at the given XYZ
+     */
+    public byte get(int x, int y, int z) {
+        return get(y << 8 | z << 4 | x);
+    }
+
+    /**
+     * Get the value at an index
+     *
+     * @param index The index to lookup
+     * @return The value at that index.
+     */
+    public byte get(int index) {
+        byte value = handle[index / 2];
+        if (index % 2 == 0) {
+            return (byte) (value & 0xF);
+        } else {
+            return (byte) ((value >> 4) & 0xF);
+        }
+    }
+
+    /**
+     * Set the value based on an x, y, z
+     *
+     * @param x     Block X
+     * @param y     Block Y
+     * @param z     Block Z
+     * @param value Desired Value
+     */
+    public void set(int x, int y, int z, int value) {
+        set(y << 8 | z << 4 | x, value);
+    }
+
+    /**
+     * Set a value at an index
+     *
+     * @param index The index to set the value at.
+     * @param value The desired value
+     */
+    public void set(int index, int value) {
+        index /= 2;
+        if (index % 2 == 0) {
+            handle[index] = (byte) (handle[index] & 0xF0 | value & 0xF);
+        } else {
+            handle[index] = (byte) (handle[index] & 0xF | (value & 0xF) << 4);
+        }
+    }
+
+    /**
+     * The size of this nibble
+     *
+     * @return The size as an int of the nibble
+     */
+    public int size() {
+        return handle.length * 2;
+    }
+
+    /**
+     * Get the actual number of bytes
+     *
+     * @return The number of bytes based on the handle.
+     */
+    public int actualSize() {
+        return handle.length;
+    }
+
+    /**
+     * Fill the array with a value
+     *
+     * @param value Value to fill with
+     */
+    public void fill(byte value) {
+        value &= 0xF; // Max nibble size (= 16)
+        Arrays.fill(handle, (byte) ((value << 4) | value));
+    }
+
+    /**
+     * Get the byte array behind this nibble
+     *
+     * @return The byte array
+     */
+    public byte[] getHandle() {
+        return handle;
+    }
+
+    /**
+     * Copy a byte array into this nibble
+     *
+     * @param handle The byte array to copy in.
+     */
+    public void setHandle(byte[] handle) {
+        if (handle.length != this.handle.length) {
+            throw new IllegalArgumentException("Length of handle must equal to size of nibble array!");
+        }
+
+        System.arraycopy(handle, 0, this.handle, 0, handle.length);
+    }
+}

src/main/java/us/myles/ViaVersion/api/minecraft/item/Item.java

@@ -0,0 +1,28 @@
+package us.myles.ViaVersion.api.minecraft.item;
+
+import lombok.*;
+import org.bukkit.inventory.ItemStack;
+import org.spacehq.opennbt.tag.builtin.CompoundTag;
+
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@ToString
+public class Item {
+    private short id;
+    private byte amount;
+    private short data;
+    private CompoundTag tag;
+
+    /**
+     * Create an item from a bukkit stack (doesn't save NBT)
+     *
+     * @param stack The stack to convert from
+     * @return The output stack
+     */
+    public static Item getItem(ItemStack stack) {
+        if (stack == null) return null;
+        return new Item((short) stack.getTypeId(), (byte) stack.getAmount(), stack.getDurability(), null);
+    }
+}

src/main/java/us/myles/ViaVersion/api/minecraft/metadata/Metadata.java

@@ -0,0 +1,26 @@
+package us.myles.ViaVersion.api.minecraft.metadata;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import lombok.Setter;
+import us.myles.ViaVersion.api.type.Type;
+
+@AllArgsConstructor
+@Getter
+@Setter
+public class Metadata {
+    private int id;
+    private int typeID;
+    private Type type;
+    private Object value;
+
+    @Override
+    public String toString() {
+        return "Metadata{" +
+                "id=" + id +
+                ", typeID=" + typeID +
+                ", type=" + type +
+                ", value=" + value +
+                '}';
+    }
+}

src/main/java/us/myles/ViaVersion/api/protocol/Protocol.java

@@ -0,0 +1,156 @@
+package us.myles.ViaVersion.api.protocol;
+
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.remapper.PacketRemapper;
+import us.myles.ViaVersion.exception.CancelException;
+import us.myles.ViaVersion.packets.Direction;
+import us.myles.ViaVersion.packets.State;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public abstract class Protocol {
+    private Map<Pair<State, Integer>, ProtocolPacket> incoming = new HashMap<>();
+    private Map<Pair<State, Integer>, ProtocolPacket> outgoing = new HashMap<>();
+
+    public Protocol() {
+        registerPackets();
+    }
+
+    /**
+     * Should this protocol filter an object packet from this class.
+     * Default: false
+     *
+     * @param packetClass The class of the current input
+     * @return True if it should handle the filtering
+     */
+    public boolean isFiltered(Class packetClass) {
+        return false;
+    }
+
+    /**
+     * Filter a packet into the output
+     *
+     * @param info   The current user connection
+     * @param packet The input packet as an object (NMS)
+     * @param output The list to put the object into.
+     * @throws Exception Throws exception if cancelled / error.
+     */
+    protected void filterPacket(UserConnection info, Object packet, List output) throws Exception {
+        output.add(packet);
+    }
+
+    /**
+     * Register listeners for this protocol
+     */
+    protected void registerListeners() {
+
+    }
+
+    /**
+     * Register the packets for this protocol
+     */
+    protected abstract void registerPackets();
+
+    /**
+     * Initialise a user for this protocol setting up objects.
+     *
+     * @param userConnection The user to initialise
+     */
+    public abstract void init(UserConnection userConnection);
+
+    /**
+     * Register an incoming packet, with simple id transformation.
+     *
+     * @param state       The state which the packet is sent in.
+     * @param oldPacketID The old packet ID
+     * @param newPacketID The new packet ID
+     */
+    public void registerIncoming(State state, int oldPacketID, int newPacketID) {
+        registerIncoming(state, oldPacketID, newPacketID, null);
+    }
+
+    /**
+     * Register an incoming packet, with id transformation and remapper.
+     *
+     * @param state          The state which the packet is sent in.
+     * @param oldPacketID    The old packet ID
+     * @param newPacketID    The new packet ID
+     * @param packetRemapper The remapper to use for the packet
+     */
+    public void registerIncoming(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper) {
+        ProtocolPacket protocolPacket = new ProtocolPacket(state, oldPacketID, newPacketID, packetRemapper);
+        incoming.put(new Pair<>(state, newPacketID), protocolPacket);
+    }
+
+    /**
+     * Register an outgoing packet, with simple id transformation.
+     *
+     * @param state       The state which the packet is sent in.
+     * @param oldPacketID The old packet ID
+     * @param newPacketID The new packet ID
+     */
+    public void registerOutgoing(State state, int oldPacketID, int newPacketID) {
+        registerOutgoing(state, oldPacketID, newPacketID, null);
+    }
+
+    /**
+     * Register an outgoing packet, with id transformation and remapper.
+     *
+     * @param state          The state which the packet is sent in.
+     * @param oldPacketID    The old packet ID
+     * @param newPacketID    The new packet ID
+     * @param packetRemapper The remapper to use for the packet
+     */
+    public void registerOutgoing(State state, int oldPacketID, int newPacketID, PacketRemapper packetRemapper) {
+        ProtocolPacket protocolPacket = new ProtocolPacket(state, oldPacketID, newPacketID, packetRemapper);
+        outgoing.put(new Pair<>(state, oldPacketID), protocolPacket);
+    }
+
+    /**
+     * Transform a packet using this protocol
+     *
+     * @param direction     The direction the packet is going in
+     * @param state         The current protocol state
+     * @param packetWrapper The packet wrapper to transform
+     * @throws Exception Throws exception if it fails to transform
+     */
+    public void transform(Direction direction, State state, PacketWrapper packetWrapper) throws Exception {
+        Pair<State, Integer> statePacket = new Pair<>(state, packetWrapper.getId());
+        Map<Pair<State, Integer>, ProtocolPacket> packetMap = (direction == Direction.OUTGOING ? outgoing : incoming);
+        ProtocolPacket protocolPacket;
+        if (packetMap.containsKey(statePacket)) {
+            protocolPacket = packetMap.get(statePacket);
+        } else {
+            return;
+        }
+        // write packet id
+        int newID = direction == Direction.OUTGOING ? protocolPacket.getNewID() : protocolPacket.getOldID();
+        packetWrapper.setId(newID);
+        // remap
+        if (protocolPacket.getRemapper() != null) {
+            protocolPacket.getRemapper().remap(packetWrapper);
+            if (packetWrapper.isCancelled())
+                throw new CancelException();
+        }
+    }
+
+    @Override
+    public String toString() {
+        return "Protocol:" + getClass().getSimpleName();
+    }
+
+    @AllArgsConstructor
+    @Getter
+    class ProtocolPacket {
+        State state;
+        int oldID;
+        int newID;
+        PacketRemapper remapper;
+    }
+}

src/main/java/us/myles/ViaVersion/api/protocol/ProtocolPipeline.java

@@ -0,0 +1,166 @@
+package us.myles.ViaVersion.api.protocol;
+
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.packets.Direction;
+import us.myles.ViaVersion.packets.PacketType;
+import us.myles.ViaVersion.packets.State;
+import us.myles.ViaVersion.protocols.base.ProtocolInfo;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.logging.Level;
+
+public class ProtocolPipeline extends Protocol {
+    List<Protocol> protocolList;
+    private UserConnection userConnection;
+
+    public ProtocolPipeline(UserConnection userConnection) {
+        super();
+        init(userConnection);
+    }
+
+    @Override
+    protected void registerPackets() {
+        protocolList = new CopyOnWriteArrayList<>();
+        // This is a pipeline so we register basic pipes
+        protocolList.add(ProtocolRegistry.BASE_PROTOCOL);
+    }
+
+    @Override
+    public void init(UserConnection userConnection) {
+        this.userConnection = userConnection;
+
+        ProtocolInfo protocolInfo = new ProtocolInfo(userConnection);
+        protocolInfo.setPipeline(this);
+
+        userConnection.put(protocolInfo);
+
+        /* Init through all our pipes */
+        for (Protocol protocol : protocolList) {
+            protocol.init(userConnection);
+        }
+    }
+
+    /**
+     * Add a protocol to the current pipeline
+     * This will call the .init method.
+     *
+     * @param protocol The protocol to add to the end
+     */
+    public void add(Protocol protocol) {
+        if (protocolList != null) {
+            protocolList.add(protocol);
+            protocol.init(userConnection);
+        } else {
+            throw new NullPointerException("Tried to add protocol to early");
+        }
+    }
+
+    @Override
+    public void transform(Direction direction, State state, PacketWrapper packetWrapper) throws Exception {
+        int originalID = packetWrapper.getId();
+        List<Protocol> protocols = new ArrayList<>(protocolList);
+        // Other way if outgoing
+        if (direction == Direction.OUTGOING)
+            Collections.reverse(protocols);
+
+        for (Protocol protocol : protocols) { // Copy to prevent from removal.
+            protocol.transform(direction, state, packetWrapper);
+            // Reset the reader for the packetWrapper (So it can be recycled across packets)
+            packetWrapper.resetReader();
+        }
+        super.transform(direction, state, packetWrapper);
+
+        if (ViaVersion.getInstance().isDebug()) {
+            // Debug packet
+            String packet = "UNKNOWN";
+
+            // For 1.8/1.9 server version, eventually we'll probably get an API for this...
+            if (ProtocolRegistry.SERVER_PROTOCOL >= ProtocolVersion.v1_8.getId() &&
+                    ProtocolRegistry.SERVER_PROTOCOL <= ProtocolVersion.v1_9_3.getId()) {
+
+                PacketType type;
+                if (ProtocolRegistry.SERVER_PROTOCOL <= ProtocolVersion.v1_8.getId()) {
+                    if (direction == Direction.INCOMING) {
+                        type = PacketType.findNewPacket(state, direction, originalID);
+                    } else {
+                        type = PacketType.findOldPacket(state, direction, originalID);
+                    }
+                } else {
+                    type = PacketType.findNewPacket(state, direction, originalID);
+                }
+
+                // Filter :) This would be not hard coded too, sorry :(
+                if (type == PacketType.PLAY_CHUNK_DATA) return;
+                if (type == PacketType.PLAY_TIME_UPDATE) return;
+                if (type == PacketType.PLAY_KEEP_ALIVE) return;
+                if (type == PacketType.PLAY_KEEP_ALIVE_REQUEST) return;
+                if (type == PacketType.PLAY_ENTITY_LOOK_MOVE) return;
+                if (type == PacketType.PLAY_ENTITY_LOOK) return;
+                if (type == PacketType.PLAY_ENTITY_RELATIVE_MOVE) return;
+                if (type == PacketType.PLAY_PLAYER_POSITION_LOOK_REQUEST) return;
+                if (type == PacketType.PLAY_PLAYER_LOOK_REQUEST) return;
+                if (type == PacketType.PLAY_PLAYER_POSITION_REQUEST) return;
+
+                packet = type.name();
+            }
+            String name = packet + "[" + userConnection.get(ProtocolInfo.class).getProtocolVersion() + "]";
+            ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+            String actualUsername = packetWrapper.user().get(ProtocolInfo.class).getUsername();
+            String username = actualUsername != null ? actualUsername + " " : "";
+
+            plugin.getLogger().log(Level.INFO, "{0}{1}: {2} {3} -> {4} [{5}] Value: {6}",
+                    new Object[]{
+                            username,
+                            direction,
+                            state,
+                            originalID,
+                            packetWrapper.getId(),
+                            name,
+                            packetWrapper
+                    });
+        }
+    }
+
+    /**
+     * Check if the pipeline contains a protocol
+     *
+     * @param pipeClass The class to check
+     * @return True if the protocol class is in the pipeline
+     */
+    public boolean contains(Class<? extends Protocol> pipeClass) {
+        for (Protocol protocol : protocolList) {
+            if (protocol.getClass().equals(pipeClass)) return true;
+        }
+        return false;
+    }
+
+    /**
+     * Use the pipeline to filter a NMS packet
+     *
+     * @param o    The NMS packet object
+     * @param list The output list to write to
+     * @return If it should not write the input object to te list.
+     * @throws Exception If it failed to convert / packet cancelld.
+     */
+    public boolean filter(Object o, List list) throws Exception {
+        for (Protocol protocol : protocolList) {
+            if (protocol.isFiltered(o.getClass())) {
+                protocol.filterPacket(userConnection, o, list);
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public List<Protocol> pipes() {
+        return protocolList;
+    }
+}

src/main/java/us/myles/ViaVersion/api/protocol/ProtocolRegistry.java

@@ -0,0 +1,178 @@
+package us.myles.ViaVersion.api.protocol;
+
+import com.google.common.collect.Lists;
+import com.google.common.collect.Sets;
+import org.bukkit.Bukkit;
+import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.protocols.base.BaseProtocol;
+import us.myles.ViaVersion.protocols.protocol1_10to1_9_3.Protocol1_10To1_9_3_4;
+import us.myles.ViaVersion.protocols.protocol1_9_1_2to1_9_3_4.Protocol1_9_1_2TO1_9_3_4;
+import us.myles.ViaVersion.protocols.protocol1_9_1to1_9.Protocol1_9_1TO1_9;
+import us.myles.ViaVersion.protocols.protocol1_9_3to1_9_1_2.Protocol1_9_3TO1_9_1_2;
+import us.myles.ViaVersion.protocols.protocol1_9to1_8.Protocol1_9TO1_8;
+import us.myles.ViaVersion.protocols.protocol1_9to1_9_1.Protocol1_9TO1_9_1;
+
+import java.util.*;
+import java.util.concurrent.ConcurrentHashMap;
+
+public class ProtocolRegistry {
+    public static final Protocol BASE_PROTOCOL = new BaseProtocol();
+    public static int SERVER_PROTOCOL = -1;
+    // Input Version -> Output Version & Protocol (Allows fast lookup)
+    private static Map<Integer, Map<Integer, Protocol>> registryMap = new ConcurrentHashMap<>();
+    private static Map<Pair<Integer, Integer>, List<Pair<Integer, Protocol>>> pathCache = new ConcurrentHashMap<>();
+    private static List<Protocol> registerList = Lists.newCopyOnWriteArrayList();
+    private static Set<Integer> supportedVersions = Sets.newConcurrentHashSet();
+
+    static {
+        // Base Protocol
+        registerProtocol(BASE_PROTOCOL, Arrays.<Integer>asList(), -1);
+        // Register built in protocols
+        registerProtocol(new Protocol1_9TO1_8(), Collections.singletonList(ProtocolVersion.v1_9.getId()), ProtocolVersion.v1_8.getId());
+        registerProtocol(new Protocol1_9_1TO1_9(), Arrays.asList(ProtocolVersion.v1_9_1.getId(), ProtocolVersion.v1_9_2.getId()), ProtocolVersion.v1_9.getId());
+        registerProtocol(new Protocol1_9_3TO1_9_1_2(), Arrays.asList(ProtocolVersion.v1_9_3.getId()), ProtocolVersion.v1_9_2.getId());
+        // Only supported for 1.9.4 server to 1.9 (nothing else)
+        registerProtocol(new Protocol1_9TO1_9_1(), Arrays.asList(ProtocolVersion.v1_9.getId()), ProtocolVersion.v1_9_2.getId());
+        registerProtocol(new Protocol1_9_1_2TO1_9_3_4(), Arrays.asList(ProtocolVersion.v1_9_1.getId(), ProtocolVersion.v1_9_2.getId()), ProtocolVersion.v1_9_3.getId());
+        registerProtocol(new Protocol1_10To1_9_3_4(), Collections.singletonList(ProtocolVersion.SNAPSHOT.getId()), ProtocolVersion.v1_9_3.getId());
+
+    }
+
+    /**
+     * Register a protocol
+     *
+     * @param protocol  The protocol to register.
+     * @param supported Supported client versions.
+     * @param output    The output server version it converts to.
+     */
+    public static void registerProtocol(Protocol protocol, List<Integer> supported, Integer output) {
+        // Clear cache as this may make new routes.
+        if (pathCache.size() > 0)
+            pathCache.clear();
+
+        for (Integer version : supported) {
+            if (!registryMap.containsKey(version)) {
+                registryMap.put(version, new HashMap<Integer, Protocol>());
+            }
+
+            registryMap.get(version).put(output, protocol);
+        }
+
+        if (Bukkit.getPluginManager().getPlugin("ViaVersion").isEnabled()) {
+            protocol.registerListeners();
+            refreshVersions();
+        } else {
+            registerList.add(protocol);
+        }
+    }
+
+    public static void refreshVersions() {
+        supportedVersions.clear();
+
+        supportedVersions.add(ProtocolRegistry.SERVER_PROTOCOL);
+        for (ProtocolVersion versions : ProtocolVersion.getProtocols()) {
+            List<Pair<Integer, Protocol>> paths = getProtocolPath(versions.getId(), ProtocolRegistry.SERVER_PROTOCOL);
+            if (paths == null) continue;
+            supportedVersions.add(versions.getId());
+            for (Pair<Integer, Protocol> path : paths)
+                supportedVersions.add(path.getKey());
+        }
+    }
+
+    public static SortedSet<Integer> getSupportedVersions() {
+        return Collections.unmodifiableSortedSet(new TreeSet<>(supportedVersions));
+    }
+
+    /**
+     * Check if this plugin is useful to the server.
+     *
+     * @return True if there is a useful pipe
+     */
+    public static boolean isWorkingPipe() {
+        for (Map<Integer, Protocol> maps : registryMap.values()) {
+            if (maps.containsKey(SERVER_PROTOCOL)) return true;
+        }
+        return false; // No destination for protocol
+    }
+
+    /**
+     * Called when the server is enabled, to register any non registered listeners.
+     */
+    public static void registerListeners() {
+        for (Protocol protocol : registerList) {
+            protocol.registerListeners();
+        }
+        registerList.clear();
+    }
+
+    /**
+     * Calculate a path to get from an input protocol to the servers protocol.
+     *
+     * @param current       The current items in the path
+     * @param clientVersion The current input version
+     * @param serverVersion The desired output version
+     * @return The path which has been generated, null if failed.
+     */
+    private static List<Pair<Integer, Protocol>> getProtocolPath(List<Pair<Integer, Protocol>> current, int clientVersion, int serverVersion) {
+        if (clientVersion == serverVersion) return null; // We're already there
+        if (current.size() > 50) return null; // Fail safe, protocol too complicated.
+
+        // First check if there is any protocols for this
+        if (!registryMap.containsKey(clientVersion)) {
+            return null; // Not supported
+        }
+        // Next check there isn't an obvious path
+        Map<Integer, Protocol> inputMap = registryMap.get(clientVersion);
+        if (inputMap.containsKey(serverVersion)) {
+            current.add(new Pair<>(serverVersion, inputMap.get(serverVersion)));
+            return current; // Easy solution
+        }
+        // There might be a more advanced solution... So we'll see if any of the others can get us there
+        List<Pair<Integer, Protocol>> shortest = null;
+
+        for (Map.Entry<Integer, Protocol> entry : inputMap.entrySet()) {
+            // Ensure it wasn't caught by the other loop
+            if (!entry.getKey().equals(serverVersion)) {
+                Pair<Integer, Protocol> pair = new Pair<>(entry.getKey(), entry.getValue());
+                // Ensure no recursion
+                if (!current.contains(pair)) {
+                    // Create a copy
+                    List<Pair<Integer, Protocol>> newCurrent = new ArrayList<>(current);
+                    newCurrent.add(pair);
+                    // Calculate the rest of the protocol using the current
+                    newCurrent = getProtocolPath(newCurrent, entry.getKey(), serverVersion);
+                    if (newCurrent != null) {
+                        // If it's shorter then choose it
+                        if (shortest == null || shortest.size() > newCurrent.size()) {
+                            shortest = newCurrent;
+                        }
+                    }
+                }
+            }
+        }
+
+        return shortest; // null if none found
+    }
+
+    /**
+     * Calculate a path from a client version to server version
+     *
+     * @param clientVersion The input client version
+     * @param serverVersion The desired output server version
+     * @return The path it generated, null if it failed.
+     */
+    public static List<Pair<Integer, Protocol>> getProtocolPath(int clientVersion, int serverVersion) {
+        Pair<Integer, Integer> protocolKey = new Pair<>(clientVersion, serverVersion);
+        // Check cache
+        if (pathCache.containsKey(protocolKey)) {
+            return pathCache.get(protocolKey);
+        }
+        // Generate path
+        List<Pair<Integer, Protocol>> outputPath = getProtocolPath(new ArrayList<Pair<Integer, Protocol>>(), clientVersion, serverVersion);
+        // If it found a path, cache it.
+        if (outputPath != null) {
+            pathCache.put(protocolKey, outputPath);
+        }
+        return outputPath;
+    }
+}

src/main/java/us/myles/ViaVersion/api/protocol/ProtocolVersion.java

@@ -0,0 +1,54 @@
+package us.myles.ViaVersion.api.protocol;
+
+import lombok.Data;
+import lombok.NonNull;
+
+import java.util.*;
+
+@Data
+public class ProtocolVersion {
+    private static final Map<Integer, ProtocolVersion> versions = new HashMap<>();
+
+    public static final ProtocolVersion v1_7_1;
+    public static final ProtocolVersion v1_7_6;
+    public static final ProtocolVersion v1_8;
+    public static final ProtocolVersion v1_9;
+    public static final ProtocolVersion v1_9_1;
+    public static final ProtocolVersion v1_9_2;
+    public static final ProtocolVersion v1_9_3;
+    public static final ProtocolVersion SNAPSHOT;
+
+    private final int id;
+    private final String name;
+
+    static {
+        register(v1_7_1 = new ProtocolVersion(4, "1.7-1.7.5"));
+        register(v1_7_6 = new ProtocolVersion(5, "1.7.6-1.7.10"));
+        register(v1_8 = new ProtocolVersion(47, "1.8.x"));
+        register(v1_9 = new ProtocolVersion(107, "1.9"));
+        register(v1_9_1 = new ProtocolVersion(108, "1.9.1"));
+        register(v1_9_2 = new ProtocolVersion(109, "1.9.2"));
+        register(v1_9_3 = new ProtocolVersion(110, "1.9.3/4"));
+        register(SNAPSHOT = new ProtocolVersion(210, "1.10"));
+    }
+
+    public static void register(@NonNull ProtocolVersion protocol) {
+        versions.put(protocol.getId(), protocol);
+    }
+
+    public static boolean isRegistered(int id) {
+        return versions.containsKey(id);
+    }
+
+    public static ProtocolVersion getProtocol(int id) {
+        if (versions.containsKey(id)) {
+            return versions.get(id);
+        } else {
+            return new ProtocolVersion(id, "Unknown (" + id + ")");
+        }
+    }
+
+    public static List<ProtocolVersion> getProtocols() {
+        return Collections.unmodifiableList(new ArrayList<>(versions.values()));
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/PacketHandler.java

@@ -0,0 +1,24 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.exception.InformativeException;
+
+public abstract class PacketHandler implements ValueWriter {
+    /**
+     * Handle a packet
+     *
+     * @param wrapper The associated wrapper
+     * @throws Exception Throws exception if it failed to handle the packet
+     */
+    public abstract void handle(PacketWrapper wrapper) throws Exception;
+
+    @Override
+    public void write(PacketWrapper writer, Object inputValue) throws Exception {
+        try {
+            handle(writer);
+        } catch (InformativeException e) {
+            e.addSource(this.getClass());
+            throw e;
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/PacketRemapper.java

@@ -0,0 +1,104 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.Pair;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.exception.InformativeException;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public abstract class PacketRemapper {
+    private List<Pair<ValueReader, ValueWriter>> valueRemappers = new ArrayList<>();
+
+    public PacketRemapper() {
+        registerMap();
+    }
+
+    /**
+     * Map a type to the same type.
+     *
+     * @param type Type to map
+     */
+    public void map(Type type) {
+        TypeRemapper remapper = new TypeRemapper(type);
+        map(remapper, remapper);
+    }
+
+    /**
+     * Map a type from an old type to a new type
+     *
+     * @param oldType The old type
+     * @param newType The new type
+     */
+    public void map(Type oldType, Type newType) {
+        map(new TypeRemapper(oldType), new TypeRemapper(newType));
+    }
+
+    /**
+     * Map a type from an old type to a transformed new type.
+     *
+     * @param oldType     The old type
+     * @param <T1>        The old return type.
+     * @param transformer The transformer to use to produce the new type.
+     * @param <T2>        The new return type.
+     */
+    public <T1, T2> void map(Type<T1> oldType, ValueTransformer<T1, T2> transformer) {
+        map(new TypeRemapper(oldType), transformer);
+    }
+
+    /**
+     * Map a type using a basic ValueReader to a ValueWriter
+     *
+     * @param inputReader  The reader to read with.
+     * @param outputWriter The writer to write with
+     * @param <T>          The return type
+     */
+    public <T> void map(ValueReader<T> inputReader, ValueWriter<T> outputWriter) {
+        valueRemappers.add(new Pair<ValueReader, ValueWriter>(inputReader, outputWriter));
+    }
+
+    /**
+     * Create a value
+     *
+     * @param creator The creator to used to make the value(s).
+     */
+    public void create(ValueCreator creator) {
+        map(new TypeRemapper(Type.NOTHING), creator);
+    }
+
+    /**
+     * Create a handler
+     *
+     * @param handler The handler to use to handle the current packet.
+     */
+    public void handler(PacketHandler handler) {
+        map(new TypeRemapper(Type.NOTHING), handler);
+    }
+
+    /**
+     * Register the mappings for this packet
+     */
+    public abstract void registerMap();
+
+    /**
+     * Remap a packet wrapper
+     *
+     * @param packetWrapper The wrapper to remap
+     * @throws Exception Throws if it fails to write / read to the packet.
+     */
+    public void remap(PacketWrapper packetWrapper) throws Exception {
+        try {
+            // Read all the current values
+            for (Pair<ValueReader, ValueWriter> valueRemapper : valueRemappers) {
+                Object object = valueRemapper.getKey().read(packetWrapper);
+                // Convert object to write type :O!!!
+                valueRemapper.getValue().write(packetWrapper, object);
+            }
+            // If we had handlers we'd put them here
+        } catch (InformativeException e) {
+            e.addSource(this.getClass());
+            throw e;
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/TypeRemapper.java

@@ -0,0 +1,22 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.type.Type;
+
+public class TypeRemapper<T> implements ValueReader<T>, ValueWriter<T> {
+    private final Type<T> type;
+
+    public TypeRemapper(Type<T> type) {
+        this.type = type;
+    }
+
+    @Override
+    public T read(PacketWrapper wrapper) throws Exception {
+        return wrapper.read(type);
+    }
+
+    @Override
+    public void write(PacketWrapper output, T inputValue) {
+        output.write(type, inputValue);
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/ValueCreator.java

@@ -0,0 +1,24 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.exception.InformativeException;
+
+public abstract class ValueCreator implements ValueWriter {
+    /**
+     * Write new values to a Packet.
+     *
+     * @param wrapper The packet to write to
+     * @throws Exception Throws exception if it fails to write.
+     */
+    public abstract void write(PacketWrapper wrapper) throws Exception;
+
+    @Override
+    public void write(PacketWrapper writer, Object inputValue) throws Exception {
+        try {
+            write(writer);
+        } catch (InformativeException e) {
+            e.addSource(this.getClass());
+            throw e;
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/ValueReader.java

@@ -0,0 +1,14 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+
+public interface ValueReader<T> {
+    /**
+     * Reads value from a PacketWrapper
+     *
+     * @param wrapper The wrapper to read from
+     * @return Returns the desired type
+     * @throws Exception Throws exception if it fails to read
+     */
+    T read(PacketWrapper wrapper) throws Exception;
+}

src/main/java/us/myles/ViaVersion/api/remapper/ValueTransformer.java

@@ -0,0 +1,33 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.exception.InformativeException;
+
+public abstract class ValueTransformer<T1, T2> implements ValueWriter<T1> {
+    private final Type<T2> outputType;
+
+    public ValueTransformer(Type<T2> outputType) {
+        this.outputType = outputType;
+    }
+
+    /**
+     * Transform a value from one type to another
+     *
+     * @param wrapper    The current packet
+     * @param inputValue The input value
+     * @return The value to write to the wrapper
+     * @throws Exception Throws exception if it fails to transform a value
+     */
+    public abstract T2 transform(PacketWrapper wrapper, T1 inputValue) throws Exception;
+
+    @Override
+    public void write(PacketWrapper writer, T1 inputValue) throws Exception {
+        try {
+            writer.write(outputType, transform(writer, inputValue));
+        } catch (InformativeException e) {
+            e.addSource(this.getClass());
+            throw e;
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/remapper/ValueWriter.java

@@ -0,0 +1,14 @@
+package us.myles.ViaVersion.api.remapper;
+
+import us.myles.ViaVersion.api.PacketWrapper;
+
+public interface ValueWriter<T> {
+    /**
+     * Write a value to a packet
+     *
+     * @param writer     The packet wrapper to write to
+     * @param inputValue The value to write
+     * @throws Exception Throws exception if it fails to write
+     */
+    void write(PacketWrapper writer, T inputValue) throws Exception;
+}

src/main/java/us/myles/ViaVersion/api/type/ByteBufReader.java

@@ -0,0 +1,14 @@
+package us.myles.ViaVersion.api.type;
+
+import io.netty.buffer.ByteBuf;
+
+public interface ByteBufReader<T> {
+    /**
+     * Read a value from a ByteBuf
+     *
+     * @param buffer The buffer to read from.
+     * @return The type based on the class type.
+     * @throws Exception Throws exception if it failed reading.
+     */
+    T read(ByteBuf buffer) throws Exception;
+}

src/main/java/us/myles/ViaVersion/api/type/ByteBufWriter.java

@@ -0,0 +1,14 @@
+package us.myles.ViaVersion.api.type;
+
+import io.netty.buffer.ByteBuf;
+
+public interface ByteBufWriter<T> {
+    /**
+     * Write an object to a type to a ByteBuf
+     *
+     * @param buffer The buffer to write to
+     * @param object The object to write
+     * @throws Exception Throws if it failed to write
+     */
+    void write(ByteBuf buffer, T object) throws Exception;
+}

src/main/java/us/myles/ViaVersion/api/type/PartialType.java

@@ -0,0 +1,26 @@
+package us.myles.ViaVersion.api.type;
+
+import io.netty.buffer.ByteBuf;
+
+public abstract class PartialType<T, X> extends Type<T> {
+    private final X param;
+
+    public PartialType(X param, Class<T> type) {
+        super(type);
+        this.param = param;
+    }
+
+    public abstract T read(ByteBuf buffer, X param) throws Exception;
+
+    public abstract void write(ByteBuf buffer, X param, T object) throws Exception;
+
+    @Override
+    public T read(ByteBuf buffer) throws Exception {
+        return read(buffer, this.param);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, T object) throws Exception {
+        write(buffer, this.param, object);
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/Type.java

@@ -0,0 +1,94 @@
+package us.myles.ViaVersion.api.type;
+
+
+import lombok.Getter;
+import org.bukkit.util.EulerAngle;
+import org.bukkit.util.Vector;
+import org.spacehq.opennbt.tag.builtin.CompoundTag;
+import us.myles.ViaVersion.api.minecraft.Position;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.type.types.*;
+import us.myles.ViaVersion.api.type.types.minecraft.*;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.UUID;
+
+@Getter
+public abstract class Type<T> implements ByteBufReader<T>, ByteBufWriter<T> {
+    /* Defined Types */
+    public static final Type<Byte> BYTE = new ByteType();
+    public static final Type<Byte[]> BYTE_ARRAY = new ArrayType<>(Type.BYTE);
+
+    public static final Type<byte[]> REMAINING_BYTES = new RemainingBytesType();
+
+    public static final Type<Short> UNSIGNED_BYTE = new UnsignedByteType();
+    public static final Type<Short[]> UNSIGNED_BYTE_ARRAY = new ArrayType<>(Type.UNSIGNED_BYTE);
+
+    public static final Type<Boolean> BOOLEAN = new BooleanType();
+    public static final Type<Boolean[]> BOOLEAN_ARRAY = new ArrayType<>(Type.BOOLEAN);
+    /* Number Types */
+    public static final Type<Integer> INT = new IntType();
+    public static final Type<Integer[]> INT_ARRAY = new ArrayType<>(Type.INT);
+
+    public static final Type<Double> DOUBLE = new DoubleType();
+    public static final Type<Double[]> DOUBLE_ARRAY = new ArrayType<>(Type.DOUBLE);
+
+    public static final Type<Long> LONG = new LongType();
+    public static final Type<Long[]> LONG_ARRAY = new ArrayType<>(Type.LONG);
+
+    public static final Type<Float> FLOAT = new FloatType();
+    public static final Type<Float[]> FLOAT_ARRAY = new ArrayType<>(Type.FLOAT);
+
+    public static final Type<Short> SHORT = new ShortType();
+    public static final Type<Short[]> SHORT_ARRAY = new ArrayType<>(Type.SHORT);
+
+    public static final Type<Integer> UNSIGNED_SHORT = new UnsignedShortType();
+    public static final Type<Integer[]> UNSIGNED_SHORT_ARRAY = new ArrayType<>(Type.UNSIGNED_SHORT);
+    /* Other Types */
+    public static final Type<String> STRING = new StringType();
+    public static final Type<String[]> STRING_ARRAY = new ArrayType<>(Type.STRING);
+
+    public static final Type<UUID> UUID = new UUIDType();
+    public static final Type<UUID[]> UUID_ARRAY = new ArrayType<>(Type.UUID);
+    /* Variable Types */
+    public static final Type<Integer> VAR_INT = new VarIntType();
+    public static final Type<Integer[]> VAR_INT_ARRAY = new ArrayType<>(Type.VAR_INT);
+    /* Special Types */
+    public static final Type<Void> NOTHING = new VoidType(); // This is purely used for remapping.
+    /* MC Types */
+    public static final Type<Position> POSITION = new PositionType();
+    public static final Type<EulerAngle> ROTATION = new EulerAngleType();
+    public static final Type<Vector> VECTOR = new VectorType();
+    public static final Type<CompoundTag> NBT = new NBTType();
+
+    public static final Type<UUID> OPTIONAL_UUID = new OptUUIDType();
+    public static final Type<Position> OPTIONAL_POSITION = new OptPositionType();
+
+    public static final Type<Item> ITEM = new ItemType();
+    public static final Type<Item[]> ITEM_ARRAY = new ItemArrayType();
+    /* Actual Class */
+
+    private final Class<? super T> outputClass;
+    private final Set<Class<? extends Type>> compatibilities;
+    private final String typeName;
+
+    public Type(Class<? super T> outputClass) {
+        this(outputClass.getSimpleName(), outputClass);
+    }
+
+    public Type(String typeName, Class<? super T> outputClass) {
+        this.outputClass = outputClass;
+        this.typeName = typeName;
+        this.compatibilities = new HashSet<>();
+    }
+
+    public Class<? extends Type> getBaseClass() {
+        return this.getClass();
+    }
+
+    @Override
+    public String toString() {
+        return "Type|" + getTypeName();
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/TypeConverter.java

@@ -0,0 +1,11 @@
+package us.myles.ViaVersion.api.type;
+
+public interface TypeConverter<T> {
+    /**
+     * Convert from a type to the current type
+     *
+     * @param o The input object
+     * @return The converted type as an object
+     */
+    T from(Object o);
+}

src/main/java/us/myles/ViaVersion/api/type/types/ArrayType.java

@@ -0,0 +1,68 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.lang.reflect.Array;
+
+public class ArrayType<T> extends Type<T[]> {
+    private final Type<T> elementType;
+
+    public ArrayType(Type<T> type) {
+        super(type.getTypeName() + " Array", (Class<T[]>) getArrayClass(type.getOutputClass()));
+        this.elementType = type;
+    }
+
+    /* Taken from http://stackoverflow.com/questions/4901128/obtaining-the-array-class-of-a-component-type */
+    public static Class<?> getArrayClass(Class<?> componentType) {
+        ClassLoader classLoader = componentType.getClassLoader();
+        String name;
+        if (componentType.isArray()) {
+            // just add a leading "["
+            name = "[" + componentType.getName();
+        } else if (componentType == boolean.class) {
+            name = "[Z";
+        } else if (componentType == byte.class) {
+            name = "[B";
+        } else if (componentType == char.class) {
+            name = "[C";
+        } else if (componentType == double.class) {
+            name = "[D";
+        } else if (componentType == float.class) {
+            name = "[F";
+        } else if (componentType == int.class) {
+            name = "[I";
+        } else if (componentType == long.class) {
+            name = "[J";
+        } else if (componentType == short.class) {
+            name = "[S";
+        } else {
+            // must be an object non-array class
+            name = "[L" + componentType.getName() + ";";
+        }
+        try {
+            return classLoader != null ? classLoader.loadClass(name) : Class.forName(name);
+        } catch (ClassNotFoundException e) {
+            return null; // oh
+        }
+    }
+
+    @Override
+    public T[] read(ByteBuf buffer) throws Exception {
+        int amount = Type.VAR_INT.read(buffer);
+        T[] array = (T[]) Array.newInstance(elementType.getOutputClass(), amount);
+
+        for (int i = 0; i < amount; i++) {
+            array[i] = elementType.read(buffer);
+        }
+        return array;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, T[] object) throws Exception {
+        Type.VAR_INT.write(buffer, object.length);
+        for (T o : object) {
+            elementType.write(buffer, o);
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/BooleanType.java

@@ -0,0 +1,30 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class BooleanType extends Type<Boolean> implements TypeConverter<Boolean> {
+    public BooleanType() {
+        super(Boolean.class);
+    }
+
+    @Override
+    public Boolean read(ByteBuf buffer) {
+        return buffer.readBoolean();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Boolean object) {
+        buffer.writeBoolean(object);
+    }
+
+
+    @Override
+    public Boolean from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).intValue() == 1;
+        }
+        return (Boolean) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/ByteType.java

@@ -0,0 +1,33 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class ByteType extends Type<Byte> implements TypeConverter<Byte> {
+    public ByteType() {
+        super(Byte.class);
+    }
+
+    @Override
+    public Byte read(ByteBuf buffer) {
+        return buffer.readByte();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Byte object) {
+        buffer.writeByte(object);
+    }
+
+
+    @Override
+    public Byte from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).byteValue();
+        }
+        if (o instanceof Boolean) {
+            return (Boolean) o ? (byte) 1 : 0;
+        }
+        return (Byte) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/DoubleType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class DoubleType extends Type<Double> implements TypeConverter<Double> {
+    public DoubleType() {
+        super(Double.class);
+    }
+
+    @Override
+    public Double read(ByteBuf buffer) {
+        return buffer.readDouble();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Double object) {
+        buffer.writeDouble(object);
+    }
+
+    @Override
+    public Double from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).doubleValue();
+        }
+        if (o instanceof Boolean) {
+            return (Boolean) o ? (byte) 1D : 0D;
+        }
+        return (Double) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/FloatType.java

@@ -0,0 +1,33 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class FloatType extends Type<Float> implements TypeConverter<Float> {
+    public FloatType() {
+        super(Float.class);
+    }
+
+    @Override
+    public Float read(ByteBuf buffer) {
+        return buffer.readFloat();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Float object) {
+        buffer.writeFloat(object);
+    }
+
+
+    @Override
+    public Float from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).floatValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? 1F : 0;
+        }
+        return (Float) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/IntType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class IntType extends Type<Integer> implements TypeConverter<Integer> {
+    public IntType() {
+        super(Integer.class);
+    }
+
+    @Override
+    public Integer read(ByteBuf buffer) {
+        return buffer.readInt();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Integer object) {
+        buffer.writeInt(object);
+    }
+
+    @Override
+    public Integer from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).intValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? 1 : 0;
+        }
+        return (Integer) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/LongType.java

@@ -0,0 +1,33 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class LongType extends Type<Long> implements TypeConverter<Long> {
+    public LongType() {
+        super(Long.class);
+    }
+
+    @Override
+    public Long read(ByteBuf buffer) {
+        return buffer.readLong();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Long object) {
+        buffer.writeLong(object);
+    }
+
+
+    @Override
+    public Long from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).longValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? 1L : 0;
+        }
+        return (Long) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/RemainingBytesType.java

@@ -0,0 +1,22 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+public class RemainingBytesType extends Type<byte[]> {
+    public RemainingBytesType() {
+        super(byte[].class);
+    }
+
+    @Override
+    public byte[] read(ByteBuf buffer) {
+        byte[] array = new byte[buffer.readableBytes()];
+        buffer.readBytes(array);
+        return array;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, byte[] object) {
+        buffer.writeBytes(object);
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/ShortType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class ShortType extends Type<Short> implements TypeConverter<Short> {
+    public ShortType() {
+        super(Short.class);
+    }
+
+    @Override
+    public Short read(ByteBuf buffer) {
+        return buffer.readShort();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Short object) {
+        buffer.writeShort(object);
+    }
+
+    @Override
+    public Short from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).shortValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? (short) 1 : 0;
+        }
+        return (short) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/StringType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import com.google.common.base.Charsets;
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+public class StringType extends Type<String> {
+    public StringType() {
+        super(String.class);
+    }
+
+    @Override
+    public String read(ByteBuf buffer) throws Exception {
+        int len = Type.VAR_INT.read(buffer);
+        Preconditions.checkArgument(len <= Short.MAX_VALUE, "Cannot receive string longer than Short.MAX_VALUE (got %s characters)", len);
+
+        byte[] b = new byte[len];
+        buffer.readBytes(b);
+
+        return new String(b, Charsets.UTF_8);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, String object) throws Exception {
+        Preconditions.checkArgument(object.length() <= Short.MAX_VALUE, "Cannot send string longer than Short.MAX_VALUE (got %s characters)", object.length());
+
+        byte[] b = object.getBytes(Charsets.UTF_8);
+        Type.VAR_INT.write(buffer, b.length);
+        buffer.writeBytes(b);
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/UUIDType.java

@@ -0,0 +1,23 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.util.UUID;
+
+public class UUIDType extends Type<UUID> {
+    public UUIDType() {
+        super(UUID.class);
+    }
+
+    @Override
+    public UUID read(ByteBuf buffer) {
+        return new UUID(buffer.readLong(), buffer.readLong());
+    }
+
+    @Override
+    public void write(ByteBuf buffer, UUID object) {
+        buffer.writeLong(object.getMostSignificantBits());
+        buffer.writeLong(object.getLeastSignificantBits());
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/UnsignedByteType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class UnsignedByteType extends Type<Short> implements TypeConverter<Short> {
+    public UnsignedByteType() {
+        super(Short.class);
+    }
+
+    @Override
+    public Short read(ByteBuf buffer) {
+        return buffer.readUnsignedByte();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Short object) {
+        buffer.writeByte(object);
+    }
+
+    @Override
+    public Short from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).shortValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? (short) 1 : 0;
+        }
+        return (short) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/UnsignedShortType.java

@@ -0,0 +1,32 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class UnsignedShortType extends Type<Integer> implements TypeConverter<Integer> {
+    public UnsignedShortType() {
+        super(Integer.class);
+    }
+
+    @Override
+    public Integer read(ByteBuf buffer) {
+        return buffer.readUnsignedShort();
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Integer object) {
+        buffer.writeShort(object);
+    }
+
+    @Override
+    public Integer from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).intValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? 1 : 0;
+        }
+        return (Integer) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/VarIntType.java

@@ -0,0 +1,65 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class VarIntType extends Type<Integer> implements TypeConverter<Integer> {
+
+    public VarIntType() {
+        super("VarInt", Integer.class);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Integer object) {
+        int part;
+        while (true) {
+            part = object & 0x7F;
+
+            object >>>= 7;
+            if (object != 0) {
+                part |= 0x80;
+            }
+
+            buffer.writeByte(part);
+
+            if (object == 0) {
+                break;
+            }
+        }
+    }
+
+    @Override
+    public Integer read(ByteBuf buffer) {
+        int out = 0;
+        int bytes = 0;
+        byte in;
+        while (true) {
+            in = buffer.readByte();
+
+            out |= (in & 0x7F) << (bytes++ * 7);
+
+            if (bytes > 5) { // 5 is maxBytes
+                throw new RuntimeException("VarInt too big");
+            }
+
+            if ((in & 0x80) != 0x80) {
+                break;
+            }
+        }
+
+        return out;
+    }
+
+
+    @Override
+    public Integer from(Object o) {
+        if (o instanceof Number) {
+            return ((Number) o).intValue();
+        }
+        if (o instanceof Boolean) {
+            return ((Boolean) o) ? 1 : 0;
+        }
+        return (Integer) o;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/VoidType.java

@@ -0,0 +1,26 @@
+package us.myles.ViaVersion.api.type.types;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.api.type.TypeConverter;
+
+public class VoidType extends Type<Void> implements TypeConverter<Void> {
+    public VoidType() {
+        super(Void.class);
+    }
+
+    @Override
+    public Void read(ByteBuf buffer) {
+        return null;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Void object) {
+
+    }
+
+    @Override
+    public Void from(Object o) {
+        return null;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/EulerAngleType.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import org.bukkit.util.EulerAngle;
+import us.myles.ViaVersion.api.type.Type;
+
+public class EulerAngleType extends Type<EulerAngle> {
+    public EulerAngleType() {
+        super(EulerAngle.class);
+    }
+
+    @Override
+    public EulerAngle read(ByteBuf buffer) throws Exception {
+        float x = Type.FLOAT.read(buffer);
+        float y = Type.FLOAT.read(buffer);
+        float z = Type.FLOAT.read(buffer);
+
+        return new EulerAngle(x, y, z);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, EulerAngle object) throws Exception {
+        Type.FLOAT.write(buffer, (float) object.getX());
+        Type.FLOAT.write(buffer, (float) object.getY());
+        Type.FLOAT.write(buffer, (float) object.getZ());
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/ItemArrayType.java

@@ -0,0 +1,30 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.type.Type;
+
+public class ItemArrayType extends Type<Item[]> {
+
+    public ItemArrayType() {
+        super("Item Array", Item[].class);
+    }
+
+    @Override
+    public Item[] read(ByteBuf buffer) throws Exception {
+        int amount = Type.SHORT.read(buffer);
+        Item[] array = new Item[amount];
+        for (int i = 0; i < amount; i++) {
+            array[i] = Type.ITEM.read(buffer);
+        }
+        return array;
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Item[] object) throws Exception {
+        Type.SHORT.write(buffer, (short) object.length);
+        for (Item o : object) {
+            Type.ITEM.write(buffer, o);
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/ItemType.java

@@ -0,0 +1,38 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.item.Item;
+import us.myles.ViaVersion.api.type.Type;
+
+public class ItemType extends Type<Item> {
+    public ItemType() {
+        super(Item.class);
+    }
+
+    @Override
+    public Item read(ByteBuf buffer) throws Exception {
+        short id = buffer.readShort();
+        if (id < 0) {
+            return null;
+        } else {
+            Item item = new Item();
+            item.setId(id);
+            item.setAmount(buffer.readByte());
+            item.setData(buffer.readShort());
+            item.setTag(Type.NBT.read(buffer));
+            return item;
+        }
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Item object) throws Exception {
+        if (object == null) {
+            buffer.writeShort(-1);
+        } else {
+            buffer.writeShort(object.getId());
+            buffer.writeByte(object.getAmount());
+            buffer.writeShort(object.getData());
+            Type.NBT.write(buffer, object.getTag());
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/MetaListTypeTemplate.java

@@ -0,0 +1,17 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.util.List;
+
+public abstract class MetaListTypeTemplate extends Type<List<Metadata>> {
+    public MetaListTypeTemplate() {
+        super("MetaData List", List.class);
+    }
+
+    @Override
+    public Class<? extends Type> getBaseClass() {
+        return MetaListTypeTemplate.class;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/MetaTypeTemplate.java

@@ -0,0 +1,15 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import us.myles.ViaVersion.api.minecraft.metadata.Metadata;
+import us.myles.ViaVersion.api.type.Type;
+
+public abstract class MetaTypeTemplate extends Type<Metadata> {
+    public MetaTypeTemplate() {
+        super("Metadata type", Metadata.class);
+    }
+
+    @Override
+    public Class<? extends Type> getBaseClass() {
+        return MetaTypeTemplate.class;
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/NBTType.java

@@ -0,0 +1,49 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import com.google.common.base.Preconditions;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufInputStream;
+import io.netty.buffer.ByteBufOutputStream;
+import org.spacehq.opennbt.NBTIO;
+import org.spacehq.opennbt.tag.builtin.CompoundTag;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+
+public class NBTType extends Type<CompoundTag> {
+    public NBTType() {
+        super(CompoundTag.class);
+    }
+
+    @Override
+    public CompoundTag read(ByteBuf buffer) throws Exception {
+        Preconditions.checkArgument(buffer.readableBytes() <= 2097152, "Cannot read NBT (got %s bytes)", buffer.readableBytes());
+
+        int readerIndex = buffer.readerIndex();
+        byte b = buffer.readByte();
+        if (b == 0) {
+            return null;
+        } else {
+            buffer.readerIndex(readerIndex);
+            ByteBufInputStream bytebufStream = new ByteBufInputStream(buffer);
+            try (DataInputStream dataInputStream = new DataInputStream(bytebufStream)) {
+                return (CompoundTag) NBTIO.readTag(dataInputStream);
+            }
+        }
+    }
+
+    @Override
+    public void write(ByteBuf buffer, CompoundTag object) throws Exception {
+        if (object == null) {
+            buffer.writeByte(0);
+        } else {
+            ByteBufOutputStream bytebufStream = new ByteBufOutputStream(buffer);
+            DataOutputStream dataOutputStream = new DataOutputStream(bytebufStream);
+
+            NBTIO.writeTag(dataOutputStream, object);
+
+            dataOutputStream.close();
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/OptPositionType.java

@@ -0,0 +1,25 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.Position;
+import us.myles.ViaVersion.api.type.Type;
+
+public class OptPositionType extends Type<Position> {
+    public OptPositionType() {
+        super(Position.class);
+    }
+
+    @Override
+    public Position read(ByteBuf buffer) throws Exception {
+        boolean present = buffer.readBoolean();
+        if (!present) return null;
+        return Type.POSITION.read(buffer);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Position object) throws Exception {
+        buffer.writeBoolean(object != null);
+        if (object != null)
+            Type.POSITION.write(buffer, object);
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/OptUUIDType.java

@@ -0,0 +1,30 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.type.Type;
+
+import java.util.UUID;
+
+public class OptUUIDType extends Type<UUID> {
+    public OptUUIDType() {
+        super(UUID.class);
+    }
+
+    @Override
+    public UUID read(ByteBuf buffer) {
+        boolean present = buffer.readBoolean();
+        if (!present) return null;
+        return new UUID(buffer.readLong(), buffer.readLong());
+    }
+
+    @Override
+    public void write(ByteBuf buffer, UUID object) {
+        if (object == null) {
+            buffer.writeBoolean(false);
+        } else {
+            buffer.writeBoolean(true);
+            buffer.writeLong(object.getMostSignificantBits());
+            buffer.writeLong(object.getLeastSignificantBits());
+        }
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/PositionType.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import us.myles.ViaVersion.api.minecraft.Position;
+import us.myles.ViaVersion.api.type.Type;
+
+public class PositionType extends Type<Position> {
+    public PositionType() {
+        super(Position.class);
+    }
+
+    @Override
+    public Position read(ByteBuf buffer) {
+        long val = buffer.readLong();
+        long x = (val >> 38); // signed
+        long y = (val >> 26) & 0xfff; // unsigned
+        // this shifting madness is used to preserve sign
+        long z = (val << 38) >> 38; // signed
+
+        return new Position(x, y, z);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Position object) {
+        buffer.writeLong(((object.getX() & 0x3ffffff) << 38) | ((object.getY() & 0xfff) << 26) | (object.getZ() & 0x3ffffff));
+    }
+}

src/main/java/us/myles/ViaVersion/api/type/types/minecraft/VectorType.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.api.type.types.minecraft;
+
+import io.netty.buffer.ByteBuf;
+import org.bukkit.util.Vector;
+import us.myles.ViaVersion.api.type.Type;
+
+public class VectorType extends Type<Vector> {
+    public VectorType() {
+        super(Vector.class);
+    }
+
+    @Override
+    public Vector read(ByteBuf buffer) throws Exception {
+        int x = Type.INT.read(buffer);
+        int y = Type.INT.read(buffer);
+        int z = Type.INT.read(buffer);
+
+        return new Vector(x, y, z);
+    }
+
+    @Override
+    public void write(ByteBuf buffer, Vector object) throws Exception {
+        Type.INT.write(buffer, object.getBlockX());
+        Type.INT.write(buffer, object.getBlockY());
+        Type.INT.write(buffer, object.getBlockZ());
+    }
+}

src/main/java/us/myles/ViaVersion/boss/ViaBossBar.java

@@ -0,0 +1,237 @@
+package us.myles.ViaVersion.boss;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import lombok.Getter;
+import lombok.NonNull;
+import lombok.RequiredArgsConstructor;
+import org.apache.commons.lang.Validate;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.boss.BossBar;
+import us.myles.ViaVersion.api.boss.BossColor;
+import us.myles.ViaVersion.api.boss.BossFlag;
+import us.myles.ViaVersion.api.boss.BossStyle;
+import us.myles.ViaVersion.api.protocol.ProtocolVersion;
+import us.myles.ViaVersion.api.type.Type;
+import us.myles.ViaVersion.protocols.protocol1_9to1_8.Protocol1_9TO1_8;
+
+import java.util.*;
+
+@Getter
+public class ViaBossBar implements BossBar {
+    private UUID uuid;
+    private String title;
+    private float health;
+    private BossColor color;
+    private BossStyle style;
+    private Set<UUID> players;
+    private boolean visible;
+    private Set<BossFlag> flags;
+
+    public ViaBossBar(String title, float health, BossColor color, BossStyle style) {
+        Validate.notNull(title, "Title cannot be null");
+        Validate.isTrue((health >= 0 && health <= 1), "Health must be between 0 and 1");
+        this.uuid = UUID.randomUUID();
+        this.title = title;
+        this.health = health;
+        this.color = color == null ? BossColor.PURPLE : color;
+        this.style = style == null ? BossStyle.SOLID : style;
+        this.players = new HashSet<>();
+        this.flags = new HashSet<>();
+        visible = true;
+    }
+
+    @Override
+    public BossBar setTitle(@NonNull String title) {
+        this.title = title;
+        sendPacket(UpdateAction.UPDATE_TITLE);
+        return this;
+    }
+
+    @Override
+    public BossBar setHealth(float health) {
+        Validate.isTrue((health >= 0 && health <= 1), "Health must be between 0 and 1");
+        this.health = health;
+        sendPacket(UpdateAction.UPDATE_HEALTH);
+        return this;
+    }
+
+    @Override
+    public BossColor getColor() {
+        return color;
+    }
+
+    @Override
+    public BossBar setColor(@NonNull BossColor color) {
+        this.color = color;
+        sendPacket(UpdateAction.UPDATE_STYLE);
+        return this;
+    }
+
+    @Override
+    public BossBar setStyle(@NonNull BossStyle style) {
+        this.style = style;
+        sendPacket(UpdateAction.UPDATE_STYLE);
+        return this;
+    }
+
+    @Override
+    public BossBar addPlayer(@NonNull Player player) {
+        return addPlayer(player.getUniqueId());
+    }
+
+    @Override
+    public BossBar addPlayer(UUID player) {
+        if (!players.contains(player)) {
+            players.add(player);
+            if (visible)
+                sendPacket(player, getPacket(UpdateAction.ADD));
+        }
+        return this;
+    }
+
+    @Override
+    public BossBar removePlayer(@NonNull Player player) {
+        if (players.contains(player.getUniqueId())) {
+            players.remove(player.getUniqueId());
+            sendPacket(player.getUniqueId(), getPacket(UpdateAction.REMOVE));
+        }
+        return this;
+    }
+
+    @Override
+    public BossBar addPlayers(@NonNull Player... players) {
+        for (Player p : players)
+            addPlayer(p);
+        return this;
+    }
+
+    @Override
+    public BossBar addFlag(@NonNull BossFlag flag) {
+        if (!hasFlag(flag))
+            flags.add(flag);
+        sendPacket(UpdateAction.UPDATE_FLAGS);
+        return this;
+    }
+
+    @Override
+    public BossBar removeFlag(@NonNull BossFlag flag) {
+        if (hasFlag(flag))
+            flags.remove(flag);
+        sendPacket(UpdateAction.UPDATE_FLAGS);
+        return this;
+    }
+
+    @Override
+    public boolean hasFlag(@NonNull BossFlag flag) {
+        return flags.contains(flag);
+    }
+
+    @Override
+    public Set<UUID> getPlayers() {
+        return Collections.unmodifiableSet(players);
+    }
+
+    @Override
+    public BossBar show() {
+        setVisible(true);
+        return this;
+    }
+
+    @Override
+    public BossBar hide() {
+        setVisible(false);
+        return this;
+    }
+
+    @Override
+    public boolean isVisible() {
+        return visible;
+    }
+
+    private void setVisible(boolean value) {
+        if (visible != value) {
+            visible = value;
+            sendPacket(value ? UpdateAction.ADD : UpdateAction.REMOVE);
+        }
+    }
+
+    private void sendPacket(UpdateAction action) {
+        for (UUID uuid : new ArrayList<>(players)) {
+            ByteBuf buf = getPacket(action);
+            sendPacket(uuid, buf);
+        }
+    }
+
+    private void sendPacket(UUID uuid, ByteBuf buf) {
+        if (!ViaVersion.getInstance().isPorted(uuid) || !(ViaVersion.getInstance().getPlayerVersion(uuid) >= ProtocolVersion.v1_9.getId())) {
+            players.remove(uuid);
+            buf.release();
+            return;
+        }
+        ViaVersion.getInstance().sendRawPacket(uuid, buf);
+    }
+
+    private ByteBuf getPacket(UpdateAction action) {
+        try {
+            ByteBuf buf = Unpooled.buffer();
+            Type.VAR_INT.write(buf, 0x0C); // Boss bar packet
+            Type.UUID.write(buf, uuid);
+            Type.VAR_INT.write(buf, action.getId());
+            switch (action) {
+                case ADD:
+                    Type.STRING.write(buf, fixJson(title));
+                    buf.writeFloat(health);
+                    Type.VAR_INT.write(buf, color.getId());
+                    Type.VAR_INT.write(buf, style.getId());
+                    buf.writeByte(flagToBytes());
+                    break;
+                case REMOVE:
+                    break;
+                case UPDATE_HEALTH:
+                    buf.writeFloat(health);
+                    break;
+                case UPDATE_TITLE:
+                    Type.STRING.write(buf, fixJson(title));
+                    break;
+                case UPDATE_STYLE:
+                    Type.VAR_INT.write(buf, color.getId());
+                    Type.VAR_INT.write(buf, style.getId());
+                    break;
+                case UPDATE_FLAGS:
+                    buf.writeByte(flagToBytes());
+                    break;
+            }
+
+            return buf;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+
+    private int flagToBytes() {
+        int bitmask = 0;
+        for (BossFlag flag : flags)
+            bitmask |= flag.getId();
+        return bitmask;
+    }
+
+    private String fixJson(String text) {
+        return Protocol1_9TO1_8.fixJson(text);
+    }
+
+    @RequiredArgsConstructor
+    @Getter
+    private enum UpdateAction {
+        ADD(0),
+        REMOVE(1),
+        UPDATE_HEALTH(2),
+        UPDATE_TITLE(3),
+        UPDATE_STYLE(4),
+        UPDATE_FLAGS(5);
+
+        private final int id;
+    }
+}

src/main/java/us/myles/ViaVersion/chunks/ByteWriter.java

@@ -1,52 +0,0 @@
-package us.myles.ViaVersion.chunks;
-
-public class ByteWriter {
-    private final byte[] bytes;
-    private int byteIndex;
-    private int bitIndex;
-
-    public ByteWriter(int size) {
-        this.bytes = new byte[size];
-        this.byteIndex = 0;
-        this.bitIndex = 0;
-    }
-
-    public byte[] getOutput() {
-        return this.bytes;
-    }
-
-    public void writeFullByte(int b){
-        writeByte(b, 8);
-    }
-
-    public void writeByte(int b, int length) {
-        byte current = getCurrentByte();
-        byte byteB = (byte)(int)((b) & 0xff);
-        System.out.println("Input: " + byteB);
-        System.out.println(Integer.toBinaryString(byteB));
-
-        int space = (8 - bitIndex);
-        int written = space > length ? length : space;
-        System.out.println("Written is " + written);
-        bytes[byteIndex] = (byte) (current | (extractRange(byteB, 0, written) >> (bitIndex - 1)));
-        System.out.println("output value: " + bytes[byteIndex]);
-        this.bitIndex += length;
-        if(this.bitIndex >= 8) {
-            this.byteIndex += 1;
-            this.bitIndex = bitIndex - 8;
-            // write remaining into this
-            System.out.println("Writing from " + written + " to " + (written + bitIndex));
-            System.out.println("Value: " + extractRange(byteB, written, written + bitIndex));
-            bytes[byteIndex] = (byte) (extractRange(byteB, written, written + bitIndex) << written);
-        }
-    }
-
-    private byte extractRange(int in, int begin, int end){
-        return (byte) ((in >> begin) & ((1 << (end - begin)) - 1));
-    }
-    public byte getCurrentByte() {
-        if(byteIndex == bytes.length) throw new RuntimeException("ByteWriter overflow!");
-
-        return bytes[byteIndex];
-    }
-}

src/main/java/us/myles/ViaVersion/chunks/MagicBitSet.java

@@ -1,16 +0,0 @@
-package us.myles.ViaVersion.chunks;
-
-import java.util.BitSet;
-
-public class MagicBitSet extends BitSet{
-    private final int initLength;
-
-    public MagicBitSet(int nbits) {
-        super(nbits);
-        this.initLength = nbits;
-    }
-
-    public int getTrueLength() {
-        return length() == 0 ? initLength : length();
-    }
-}

src/main/java/us/myles/ViaVersion/chunks/PacketChunk.java

@@ -1,19 +0,0 @@
-package us.myles.ViaVersion.chunks;
-
-public class PacketChunk {
-    private PacketChunkData[] chunkData;
-    private byte[] biomeData;
-
-    public PacketChunk(PacketChunkData[] chunkData, byte[] biomeData) {
-        this.chunkData = chunkData;
-        this.biomeData = biomeData;
-    }
-
-    public PacketChunkData[] getChunkData() {
-        return chunkData;
-    }
-
-    public byte[] getBiomeData() {
-        return biomeData;
-    }
-}

src/main/java/us/myles/ViaVersion/chunks/PacketChunkData.java

@@ -1,25 +0,0 @@
-package us.myles.ViaVersion.chunks;
-
-public class PacketChunkData {
-    private short[] blocks = new short[4096];
-    private byte[] blockLight = new byte[2048];
-    private byte[] skyLight;
-
-    public PacketChunkData(boolean isSkyLightData) {
-        if(isSkyLightData){
-            skyLight = new byte[2048];
-        }
-    }
-
-    public short[] getBlocks() {
-        return this.blocks;
-    }
-
-    public byte[] getBlockLight() {
-        return this.blockLight;
-    }
-
-    public byte[] getSkyLight() {
-        return this.skyLight;
-    }
-}

src/main/java/us/myles/ViaVersion/classgenerator/BasicHandlerConstructor.java

@@ -0,0 +1,19 @@
+package us.myles.ViaVersion.classgenerator;
+
+import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.MessageToByteEncoder;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.handlers.ViaDecodeHandler;
+import us.myles.ViaVersion.handlers.ViaEncodeHandler;
+
+public class BasicHandlerConstructor implements HandlerConstructor {
+    @Override
+    public ViaEncodeHandler newEncodeHandler(UserConnection info, MessageToByteEncoder minecraftEncoder) {
+        return new ViaEncodeHandler(info, minecraftEncoder);
+    }
+
+    @Override
+    public ViaDecodeHandler newDecodeHandler(UserConnection info, ByteToMessageDecoder minecraftDecoder) {
+        return new ViaDecodeHandler(info, minecraftDecoder);
+    }
+}

src/main/java/us/myles/ViaVersion/classgenerator/ClassGenerator.java

@@ -0,0 +1,88 @@
+package us.myles.ViaVersion.classgenerator;
+
+import javassist.*;
+import javassist.expr.ConstructorCall;
+import javassist.expr.ExprEditor;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.handlers.ViaDecodeHandler;
+import us.myles.ViaVersion.handlers.ViaEncodeHandler;
+import us.myles.ViaVersion.util.ReflectionUtil;
+
+public class ClassGenerator {
+    private static HandlerConstructor constructor = new BasicHandlerConstructor();
+
+    public static HandlerConstructor getConstructor() {
+        return constructor;
+    }
+
+    public static void generate() {
+        if(!ViaVersion.getInstance().isCompatSpigotBuild()) return; // Use Basic Handler as not needed.
+
+        try {
+            ClassPool pool = ClassPool.getDefault();
+            pool.insertClassPath(new LoaderClassPath(ClassGenerator.class.getClassLoader()));
+            // Generate the classes
+            transformSuperclass(pool, ViaDecodeHandler.class, ReflectionUtil.nms("PacketDecoder"));
+            transformSuperclass(pool, ViaEncodeHandler.class, ReflectionUtil.nms("PacketEncoder"));
+
+            // Implement Constructor
+            CtClass generated = pool.makeClass("us.myles.ViaVersion.classgenerator.generated.GeneratedConstructor");
+            CtClass handlerInterface = pool.get(HandlerConstructor.class.getName());
+
+            generated.setInterfaces(new CtClass[]{handlerInterface});
+            // Import required classes
+            pool.importPackage("us.myles.ViaVersion.classgenerator.generated");
+            pool.importPackage("us.myles.ViaVersion.classgenerator");
+            pool.importPackage("us.myles.ViaVersion.api.data");
+            pool.importPackage("io.netty.handler.codec");
+            // Implement Methods
+            generated.addMethod(CtMethod.make("public MessageToByteEncoder newEncodeHandler(UserConnection info, MessageToByteEncoder minecraftEncoder) {\n" +
+                    "        return new ViaEncodeHandler(info, minecraftEncoder);\n" +
+                    "    }", generated));
+            generated.addMethod(CtMethod.make("public ByteToMessageDecoder newDecodeHandler(UserConnection info, ByteToMessageDecoder minecraftDecoder) {\n" +
+                    "        return new ViaDecodeHandler(info, minecraftDecoder);\n" +
+                    "    }", generated));
+
+            constructor = (HandlerConstructor) generated.toClass(HandlerConstructor.class.getClassLoader()).newInstance();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        } catch (CannotCompileException e) {
+            e.printStackTrace();
+        } catch (NotFoundException e) {
+            e.printStackTrace();
+        } catch (InstantiationException e) {
+            e.printStackTrace();
+        } catch (IllegalAccessException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static Class transformSuperclass(ClassPool pool, Class input, Class superclass) {
+        String newName = "us.myles.ViaVersion.classgenerator.generated." + input.getSimpleName();
+
+        try {
+            CtClass toExtend = pool.get(superclass.getName());
+            CtClass generated = pool.getAndRename(input.getName(), newName);
+            generated.setSuperclass(toExtend);
+            // Modify constructor to call super
+            if(generated.getConstructors().length != 0) {
+                generated.getConstructors()[0].instrument(new ExprEditor() {
+                    @Override
+                    public void edit(ConstructorCall c) throws CannotCompileException {
+                        if (c.isSuper()) {
+                            // Constructor for both has a stats thing.
+                            c.replace("super(null);");
+                        }
+                        super.edit(c);
+                    }
+                });
+            }
+            return generated.toClass(HandlerConstructor.class.getClassLoader());
+        } catch (NotFoundException e) {
+            e.printStackTrace();
+        } catch (CannotCompileException e) {
+            e.printStackTrace();
+        }
+        return null;
+    }
+}

src/main/java/us/myles/ViaVersion/classgenerator/HandlerConstructor.java

@@ -0,0 +1,10 @@
+package us.myles.ViaVersion.classgenerator;
+
+import io.netty.handler.codec.ByteToMessageDecoder;
+import io.netty.handler.codec.MessageToByteEncoder;
+import us.myles.ViaVersion.api.data.UserConnection;
+
+public interface HandlerConstructor {
+    public MessageToByteEncoder newEncodeHandler(UserConnection info, MessageToByteEncoder minecraftEncoder);
+    public ByteToMessageDecoder newDecodeHandler(UserConnection info, ByteToMessageDecoder minecraftDecoder);
+}

src/main/java/us/myles/ViaVersion/commands/ViaCommandHandler.java

@@ -0,0 +1,153 @@
+package us.myles.ViaVersion.commands;
+
+import lombok.NonNull;
+import org.apache.commons.lang.Validate;
+import org.bukkit.ChatColor;
+import org.bukkit.command.Command;
+import org.bukkit.command.CommandExecutor;
+import org.bukkit.command.CommandSender;
+import org.bukkit.command.TabCompleter;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+import us.myles.ViaVersion.api.command.ViaVersionCommand;
+import us.myles.ViaVersion.commands.defaultsubs.*;
+
+import java.util.*;
+
+public class ViaCommandHandler implements ViaVersionCommand, CommandExecutor, TabCompleter {
+    private Map<String, ViaSubCommand> commandMap;
+
+    public ViaCommandHandler() {
+        commandMap = new HashMap<>();
+        try {
+            registerDefaults();
+        } catch (Exception e) {
+            //ignore never throws exception because it doesn't exists
+        }
+    }
+
+    @Override
+    public void registerSubCommand(@NonNull ViaSubCommand command) throws Exception {
+        Validate.isTrue(command.name().matches("^[a-z0-9_-]{3,15}$"), command.name() + " is not a valid subcommand name");
+        if (hasSubCommand(command.name()))
+            throw new Exception("ViaSubCommand " + command.name() + " does already exists!"); //Maybe another exception later.
+        commandMap.put(command.name().toLowerCase(), command);
+    }
+
+    @Override
+    public boolean hasSubCommand(String name) {
+        return commandMap.containsKey(name.toLowerCase());
+    }
+
+    @Override
+    public ViaSubCommand getSubCommand(String name) {
+        return commandMap.get(name.toLowerCase());
+    }
+
+    @Override
+    public boolean onCommand(CommandSender sender, Command cmd, String arg, String[] args) {
+        if (args.length == 0) {
+            showHelp(sender);
+            return false;
+        }
+
+        if (!hasSubCommand(args[0])) {
+            sender.sendMessage(color("&cThis command is not found"));
+            showHelp(sender);
+            return false;
+        }
+        ViaSubCommand handler = getSubCommand(args[0]);
+
+        if (!hasPermission(sender, handler.permission())) {
+            sender.sendMessage(color("&cYou are not allowed to use this command!"));
+            return false;
+        }
+
+        String[] subArgs = Arrays.copyOfRange(args, 1, args.length);
+        boolean result = handler.execute(sender, subArgs);
+        if (!result)
+            sender.sendMessage("Usage: /viaversion " + handler.usage());
+        return result;
+    }
+
+    @Override
+    public List<String> onTabComplete(CommandSender sender, Command command, String arg, String[] args) {
+        Set<ViaSubCommand> allowed = calculateAllowedCommands(sender);
+        List<String> output = new ArrayList<>();
+
+        //SubCommands tabcomplete
+        if (args.length == 1) {
+            if (!args[0].equals("")) {
+                for (ViaSubCommand sub : allowed)
+                    if (sub.name().toLowerCase().startsWith(args[0].toLowerCase()))
+                        output.add(sub.name());
+            } else {
+                for (ViaSubCommand sub : allowed)
+                    output.add(sub.name());
+            }
+        }
+        //Let the SubCommand handle it
+        else if (args.length >= 2) {
+            if (getSubCommand(args[0]) != null) {
+                ViaSubCommand sub = getSubCommand(args[0]);
+                if (!allowed.contains(sub))
+                    return output;
+
+                String[] subArgs = Arrays.copyOfRange(args, 1, args.length);
+
+                List<String> tab = sub.onTabComplete(sender, subArgs);
+                Collections.sort(tab);
+                return tab;
+            }
+        }
+        return output;
+    }
+
+    public void showHelp(CommandSender sender) {
+        Set<ViaSubCommand> allowed = calculateAllowedCommands(sender);
+        if (allowed.size() == 0) {
+            sender.sendMessage(color("&cYou are not allowed to use this command!"));
+            return;
+        }
+        sender.sendMessage(color("&aViaVersion &c" + ViaVersion.getInstance().getVersion()));
+        sender.sendMessage(color("&6Commands:"));
+        for (ViaSubCommand cmd : allowed)
+            sender.sendMessage(color(String.format("&2/viaversion %s &7- &6%s", cmd.usage(), cmd.description())));
+        allowed.clear();
+    }
+
+    private Set<ViaSubCommand> calculateAllowedCommands(CommandSender sender) {
+        Set<ViaSubCommand> cmds = new HashSet<>();
+        for (ViaSubCommand sub : commandMap.values())
+            if (hasPermission(sender, sub.permission()))
+                cmds.add(sub);
+        return cmds;
+    }
+
+    private boolean hasPermission(CommandSender sender, String permission) {
+        return permission == null || sender.hasPermission(permission);
+    }
+
+    private void registerDefaults() throws Exception {
+        registerSubCommand(new ListSubCmd());
+        registerSubCommand(new PPSSubCmd());
+        registerSubCommand(new DebugSubCmd());
+        registerSubCommand(new DisplayLeaksSubCmd());
+        registerSubCommand(new DontBugMeSubCmd());
+        registerSubCommand(new AutoTeamSubCmd());
+        registerSubCommand(new HelpSubCmd());
+        registerSubCommand(new ReloadSubCmd());
+    }
+
+    public static String color(String string) {
+        try {
+            string = ChatColor.translateAlternateColorCodes('&', string); //Dont replace all & with $ like we did before.
+        } catch (Exception ignored) {
+        }
+        return string;
+    }
+
+    public static void sendMessage(@NonNull CommandSender sender, String message, Object... args) {
+        sender.sendMessage(color(args == null ? message : String.format(message, args)));
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/AutoTeamSubCmd.java

@@ -0,0 +1,31 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+
+public class AutoTeamSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "autoteam";
+    }
+
+    @Override
+    public String description() {
+        return "Toggle automatically teaming to prevent colliding.";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+        boolean newValue = !ViaVersion.getConfig().isAutoTeam();
+        plugin.getConfig().set("auto-team", newValue);
+        plugin.saveConfig();
+        sendMessage(sender, "&6We will %s", (newValue ? "&aautomatically team players" : "&cno longer auto team players"));
+        sendMessage(sender, "&6All players will need to re-login for the change to take place.");
+
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/DebugSubCmd.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+
+public class DebugSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "debug";
+    }
+
+    @Override
+    public String description() {
+        return "Toggle debug mode";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+        plugin.setDebug(!plugin.isDebug());
+        sendMessage(sender, "&6Debug mode is now %s", (plugin.isDebug() ? "&aenabled" : "&cdisabled"));
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/DisplayLeaksSubCmd.java

@@ -0,0 +1,28 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import io.netty.util.ResourceLeakDetector;
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+
+public class DisplayLeaksSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "displayleaks";
+    }
+
+    @Override
+    public String description() {
+        return "Try to hunt memory leaks!";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        if (ResourceLeakDetector.getLevel() != ResourceLeakDetector.Level.ADVANCED)
+            ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.ADVANCED);
+        else
+            ResourceLeakDetector.setLevel(ResourceLeakDetector.Level.DISABLED);
+
+        sendMessage(sender, "&6Leak detector is now %s", (ResourceLeakDetector.getLevel() == ResourceLeakDetector.Level.ADVANCED ? "&aenabled" : "&cdisabled"));
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/DontBugMeSubCmd.java

@@ -0,0 +1,30 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+
+public class DontBugMeSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "dontbugme";
+    }
+
+    @Override
+    public String description() {
+        return "Toggle checking for updates";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+        boolean newValue = !ViaVersion.getConfig().isCheckForUpdates();
+        plugin.getConfig().set("checkforupdates", newValue);
+        plugin.saveConfig();
+        sendMessage(sender, "&6We will %snotify you about updates.", (newValue ? "&a" : "&cnot "));
+
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/HelpSubCmd.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+import us.myles.ViaVersion.commands.ViaCommandHandler;
+
+public class HelpSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "help";
+    }
+
+    @Override
+    public String description() {
+        return "You are looking at it right now!";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+        ((ViaCommandHandler) plugin.getCommandHandler()).showHelp(sender);
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/ListSubCmd.java

@@ -0,0 +1,45 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+import us.myles.ViaVersion.api.protocol.ProtocolVersion;
+
+import java.util.*;
+
+public class ListSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "list";
+    }
+
+    @Override
+    public String description() {
+        return "Shows lists of the versions from logged in players";
+    }
+
+    @Override
+    public String usage() {
+        return "list";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        Map<Integer, Set<String>> playerVersions = new HashMap<>();
+        for (Player p : Bukkit.getOnlinePlayers()) {
+            int playerVersion = ViaVersion.getInstance().getPlayerVersion(p);
+            if (!playerVersions.containsKey(playerVersion))
+                playerVersions.put(playerVersion, new HashSet<String>());
+            playerVersions.get(playerVersion).add(p.getName());
+        }
+        Map<Integer, Set<String>> sorted = new TreeMap<>(playerVersions);
+
+        for (Map.Entry<Integer, Set<String>> entry : sorted.entrySet())
+            sendMessage(sender, "&8[&6%s&8]: &b%s", ProtocolVersion.getProtocol(entry.getKey()).getName(), entry.getValue());
+
+        sorted.clear();
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/PPSSubCmd.java

@@ -0,0 +1,64 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.Bukkit;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+import us.myles.ViaVersion.api.data.UserConnection;
+import us.myles.ViaVersion.api.protocol.ProtocolVersion;
+
+import java.util.*;
+
+public class PPSSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "pps";
+    }
+
+    @Override
+    public String description() {
+        return "Shows the packets per second of online players";
+    }
+
+    @Override
+    public String usage() {
+        return "pps";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        Map<Integer, Set<String>> playerVersions = new HashMap<>();
+        int totalPackets = 0;
+        int clients = 0;
+        long max = 0;
+
+        for (Player p : Bukkit.getOnlinePlayers()) {
+            if (!ViaVersion.getInstance().isPorted(p))
+                continue;
+            int playerVersion = ViaVersion.getInstance().getPlayerVersion(p);
+            if (!playerVersions.containsKey(playerVersion))
+                playerVersions.put(playerVersion, new HashSet<String>());
+            UserConnection uc = ((ViaVersionPlugin) ViaVersion.getInstance()).getConnection(p);
+            if (uc.getPacketsPerSecond() > -1) {
+                playerVersions.get(playerVersion).add(p.getName() + " (" + uc.getPacketsPerSecond() + " PPS)");
+                totalPackets += uc.getPacketsPerSecond();
+                if (uc.getPacketsPerSecond() > max) {
+                    max = uc.getPacketsPerSecond();
+                }
+                clients++;
+            }
+        }
+        Map<Integer, Set<String>> sorted = new TreeMap<>(playerVersions);
+        sendMessage(sender, "&4Live Packets Per Second");
+        if (clients > 1) {
+            sendMessage(sender, "&cAverage: &f" + (totalPackets / clients));
+            sendMessage(sender, "&cHighest: &f" + max);
+        }
+        for (Map.Entry<Integer, Set<String>> entry : sorted.entrySet())
+            sendMessage(sender, "&8[&6%s&8]: &b%s", ProtocolVersion.getProtocol(entry.getKey()).getName(), entry.getValue());
+        sorted.clear();
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/commands/defaultsubs/ReloadSubCmd.java

@@ -0,0 +1,27 @@
+package us.myles.ViaVersion.commands.defaultsubs;
+
+import org.bukkit.command.CommandSender;
+import us.myles.ViaVersion.ViaVersionPlugin;
+import us.myles.ViaVersion.api.ViaVersion;
+import us.myles.ViaVersion.api.command.ViaSubCommand;
+
+public class ReloadSubCmd extends ViaSubCommand {
+    @Override
+    public String name() {
+        return "reload";
+    }
+
+    @Override
+    public String description() {
+        return "Reload the config from the disk";
+    }
+
+    @Override
+    public boolean execute(CommandSender sender, String[] args) {
+        ViaVersionPlugin plugin = (ViaVersionPlugin) ViaVersion.getInstance();
+
+        plugin.getConf().generateConfig();
+        sendMessage(sender, "&6Configuration successfully reloaded! Some features may need a restart.");
+        return true;
+    }
+}

src/main/java/us/myles/ViaVersion/exception/CancelException.java

@@ -0,0 +1,4 @@
+package us.myles.ViaVersion.exception;
+
+public class CancelException extends Exception {
+}

src/main/java/us/myles/ViaVersion/exception/InformativeException.java

@@ -0,0 +1,50 @@
+package us.myles.ViaVersion.exception;
+
+import java.util.HashMap;
+import java.util.Map;
+
+public class InformativeException extends Exception {
+    Map<String, Object> info = new HashMap<>();
+    int sources = 0;
+
+    public InformativeException(Throwable cause) {
+        super(cause);
+    }
+
+    public InformativeException set(String key, Object value) {
+        info.put(key, value);
+        return this;
+    }
+
+    public InformativeException addSource(Class<?> sourceClazz) {
+        return set("Source #" + sources++, getSource(sourceClazz));
+    }
+
+    private String getSource(Class<?> sourceClazz) {
+        if (sourceClazz.isAnonymousClass()) {
+            return sourceClazz.getName() + " (Anonymous)";
+        } else {
+            return sourceClazz.getName();
+        }
+    }
+
+    @Override
+    public String getMessage() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("Please post this error to http://github.com/MylesIsCool/ViaVersion/issues\n{");
+        int i = 0;
+        for (Map.Entry<String, Object> entry : info.entrySet()) {
+            builder.append((i == 0 ? "" : ", ") + entry.getKey() + ": " + entry.getValue().toString());
+            i++;
+        }
+        builder.append("}\nActual Error: ");
+
+        return builder.toString();
+    }
+
+    @Override
+    public synchronized Throwable fillInStackTrace() {
+        // Don't record this stack
+        return this;
+    }
+}