Began working on a new 0.16 update and a new NBT library.

Why do we need to do this?

I decided to start over with a new branch as a lot has changed in Voxelwind since my last 0.16-related work in late August.

As for the NBT library, this is because Mojang introduced a new NBT encoding in MCPE 0.16. This encoding uses VarInts instead of regular types. None of the other NBT libraries are active, so I'm forced to create a new library. This means I can do some things I've wanted to do for a while (immutable tag instances!)

api/pom.xml

@@ -42,7 +42,6 @@
                 <configuration>
                     <links>
                         <link>https://flowpowered.com/math</link>
-                        <link>https://flowpowered.com/math</link>
                     </links>
                 </configuration>
             </plugin>

nbt/pom.xml

@@ -0,0 +1,28 @@
+<?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"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>voxelwind</artifactId>
+        <groupId>com.voxelwind</groupId>
+        <version>1.0-SNAPSHOT</version>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>voxelwind-nbt</artifactId>
+
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.netty</groupId>
+            <artifactId>netty-buffer</artifactId>
+            <version>4.0.41.Final</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

nbt/src/main/java/com/voxelwind/nbt/io/NBTReader.java

@@ -0,0 +1,7 @@
+package com.voxelwind.nbt.io;
+
+/**
+ * Created by andrew on 10/21/16.
+ */
+public class NBTReader {
+}

nbt/src/main/java/com/voxelwind/nbt/io/NBTType.java

@@ -0,0 +1,15 @@
+package com.voxelwind.nbt.io;
+
+/**
+ * Represents the type of NBT represented by this stream.
+ */
+public enum NBTType {
+    /**
+     * Plain, uncompressed Notchian compression.
+     */
+    NOTCHIAN,
+    /**
+     * A special NBT encoding introduced in MCPE 0.16.
+     */
+    MCPE_0_16_NETWORK
+}

nbt/src/main/java/com/voxelwind/nbt/tags/EndTag.java

@@ -0,0 +1,20 @@
+package com.voxelwind.nbt.tags;
+
+/**
+ * Represents the end of an NBT structure.
+ */
+public class EndTag implements Tag<Void> {
+    public static final EndTag INSTANCE = new EndTag();
+
+    private EndTag() {
+
+    }
+
+    public String getName() {
+        return "";
+    }
+
+    public Void getValue() {
+        return null;
+    }
+}

nbt/src/main/java/com/voxelwind/nbt/tags/Tag.java

@@ -0,0 +1,7 @@
+package com.voxelwind.nbt.tags;
+
+public interface Tag<T> {
+    String getName();
+
+    T getValue();
+}

nbt/src/main/java/com/voxelwind/nbt/util/Varints.java

@@ -0,0 +1,70 @@
+package com.voxelwind.nbt.util;
+
+import io.netty.buffer.ByteBuf;
+
+import java.io.IOException;
+import java.nio.ByteBuffer;
+
+public class Varints {
+    private static final int MSB = 0x80
+            , REST = 0x7F
+            , MSBALL = ~REST;
+
+    public static void encodeUnsigned(int num, ByteBuf output) {
+        while ((num & MSBALL) != 0) {
+            output.writeByte((num & 0xFF) | MSB);
+            num >>>= 7;
+        }
+        output.writeByte(num & REST);
+    }
+
+    public static void encodeUnsigned(int num, ByteBuffer output) {
+        while ((num & MSBALL) != 0) {
+            output.put((byte) ((num & 0xFF) | MSB));
+            num >>>= 7;
+        }
+        output.put((byte) (num & REST));
+    }
+
+    public static int decodeUnsigned(ByteBuf input) throws IOException {
+        int res = 0, shift = 0, b;
+        while (((b = input.readByte()) & MSB) == 0) {
+            res += (b & REST) << shift;
+            shift += 7;
+            if (shift > 35) {
+                throw new IllegalArgumentException("Provided VarInt is not valid.");
+            }
+        }
+        return res;
+    }
+
+    public static int decodeUnsigned(ByteBuffer input) throws IOException {
+        int res = 0, shift = 0, b;
+        while (((b = input.get()) & MSB) == 0) {
+            res += (b & REST) << shift;
+            shift += 7;
+            if (shift > 35) {
+                throw new IllegalArgumentException("Provided VarInt is not valid.");
+            }
+        }
+        return res;
+    }
+
+    public static void encodeSigned(int num, ByteBuf output) throws IOException {
+        encodeUnsigned((num << 1) ^ (num >> 31), output);
+    }
+
+    public static void encodeSigned(int num, ByteBuffer output) throws IOException {
+        encodeUnsigned((num << 1) ^ (num >> 31), output);
+    }
+
+    public static int decodeSigned(ByteBuf input) throws IOException {
+        int n = decodeUnsigned(input);
+        return (n << 1) ^ (n >> 31);
+    }
+
+    public static int decodeSigned(ByteBuffer input) throws IOException {
+        int n = decodeUnsigned(input);
+        return (n << 1) ^ (n >> 31);
+    }
+}

pom.xml

@@ -12,6 +12,7 @@
         <module>api</module>
         <module>server</module>
         <module>natives</module>
+        <module>nbt</module>
     </modules>
 
     <repositories>

server/voxelwind-server.iml

@@ -29,7 +29,7 @@
     <orderEntry type="library" name="Maven: com.github.stephenc.jcip:jcip-annotations:1.0-1" level="project" />
     <orderEntry type="library" name="Maven: net.minidev:json-smart:1.3.1" level="project" />
     <orderEntry type="library" name="Maven: commons-io:commons-io:2.5" level="project" />
-    <orderEntry type="module" module-name="natives" />
+    <orderEntry type="module" module-name="voxelwind-natives" />
     <orderEntry type="library" name="Maven: org.apache.logging.log4j:log4j-api:2.6.2" level="project" />
     <orderEntry type="library" name="Maven: org.apache.logging.log4j:log4j-core:2.6.2" level="project" />
     <orderEntry type="library" name="Maven: io.netty:netty-handler:4.0.41.Final" level="project" />