Sequential Program

.gitignore

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+
+# Created by https://www.gitignore.io/api/java,intellij,intellij+all,intellij+iml
+# Edit at https://www.gitignore.io/?templates=java,intellij,intellij+all,intellij+iml
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator/
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+### Intellij+all Patch ###
+# Ignores the whole .idea folder and all .iml files
+# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+
+.idea/
+
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+*.iml
+modules.xml
+.idea/misc.xml
+*.ipr
+
+# Sonarlint plugin
+.idea/sonarlint
+
+### Intellij+iml ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+### Intellij+iml Patch ###
+# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
+
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+# End of https://www.gitignore.io/api/java,intellij,intellij+all,intellij+iml

pom.xml

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+<?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">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>org.example</groupId>
+    <artifactId>Server</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>8</source>
+                    <target>8</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/com/mojang/nbt/ByteArrayTag.java

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+package com.mojang.nbt;
+
+/**
+ * Copyright Mojang AB.
+ * 
+ * Don't do evil.
+ */
+
+import java.io.*;
+
+public class ByteArrayTag extends Tag {
+    public byte[] data;
+
+    public ByteArrayTag(String name) {
+        super(name);
+    }
+
+    public ByteArrayTag(String name, byte[] data) {
+        super(name);
+        this.data = data;
+    }
+
+    void write(DataOutput dos) throws IOException {
+        dos.writeInt(data.length);
+        dos.write(data);
+    }
+
+    void load(DataInput dis) throws IOException {
+        int length = dis.readInt();
+        data = new byte[length];
+        dis.readFully(data);
+    }
+
+    public byte getId() {
+        return TAG_Byte_Array;
+    }
+
+    public String toString() {
+        return "[" + data.length + " bytes]";
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (super.equals(obj)) {
+            ByteArrayTag o = (ByteArrayTag) obj;
+            return ((data == null && o.data == null) || (data != null && data.equals(o.data)));
+        }
+        return false;
+    }
+
+    @Override
+    public Tag copy() {
+        byte[] cp = new byte[data.length];
+        System.arraycopy(data, 0, cp, 0, data.length);
+        return new ByteArrayTag(getName(), cp);
+    }
+}

src/main/java/com/mojang/nbt/ByteTag.java

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+package com.mojang.nbt;
+
+/**
+ * Copyright Mojang AB.
+ * 
+ * Don't do evil.
+ */
+
+import java.io.*;
+
+public class ByteTag extends Tag {
+    public byte data;
+
+    public ByteTag(String name) {
+        super(name);
+    }
+
+    public ByteTag(String name, byte data) {
+        super(name);
+        this.data = data;
+    }
+
+    void write(DataOutput dos) throws IOException {
+        dos.writeByte(data);
+    }
+
+    void load(DataInput dis) throws IOException {
+        data = dis.readByte();
+    }
+
+    public byte getId() {
+        return TAG_Byte;
+    }
+
+    public String toString() {
+        return "" + data;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (super.equals(obj)) {
+            ByteTag o = (ByteTag) obj;
+            return data == o.data;
+        }
+        return false;
+    }
+
+    @Override
+    public Tag copy() {
+        return new ByteTag(getName(), data);
+    }
+}