Paper/CraftBukkit-Patches/0124-Old-New-Version-Support.patch

From 465e79587b965603307f8a3497f552dd463137cc Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Sat, 12 Apr 2014 15:11:15 +1000
Subject: [PATCH] Old / New Version Support.

This adds support for newer / older Minecraft versions.
At present it supports protocol versions 4 and 5 (1.7.2-1.7.8).

diff --git a/src/main/java/net/minecraft/server/HandshakeListener.java b/src/main/java/net/minecraft/server/HandshakeListener.java
index c738ab5..ec44fe3 100644
--- a/src/main/java/net/minecraft/server/HandshakeListener.java
+++ b/src/main/java/net/minecraft/server/HandshakeListener.java
@@ -24,6 +24,7 @@ public class HandshakeListener implements PacketHandshakingInListener {
     }
 
     public void a(PacketHandshakingInSetProtocol packethandshakinginsetprotocol) {
+        NetworkManager.a( this.b ).attr( NetworkManager.protocolVersion ).set( packethandshakinginsetprotocol.d() ); // Spigot
         switch (ProtocolOrdinalWrapper.a[packethandshakinginsetprotocol.c().ordinal()]) {
         case 1:
             this.b.a(EnumProtocol.LOGIN);
@@ -68,7 +69,7 @@ public class HandshakeListener implements PacketHandshakingInListener {
                 chatcomponenttext = new ChatComponentText( org.spigotmc.SpigotConfig.outdatedServerMessage ); // Spigot
                 this.b.handle(new PacketLoginOutDisconnect(chatcomponenttext), new GenericFutureListener[0]);
                 this.b.close(chatcomponenttext);
-            } else if (packethandshakinginsetprotocol.d() < 5) {
+            } else if (packethandshakinginsetprotocol.d() < 4) {
                 chatcomponenttext = new ChatComponentText( org.spigotmc.SpigotConfig.outdatedClientMessage ); // Spigot
                 this.b.handle(new PacketLoginOutDisconnect(chatcomponenttext), new GenericFutureListener[0]);
                 this.b.close(chatcomponenttext);
diff --git a/src/main/java/net/minecraft/server/NetworkManager.java b/src/main/java/net/minecraft/server/NetworkManager.java
index 6789ca8..7eaf694 100644
--- a/src/main/java/net/minecraft/server/NetworkManager.java
+++ b/src/main/java/net/minecraft/server/NetworkManager.java
@@ -42,6 +42,19 @@ public class NetworkManager extends SimpleChannelInboundHandler {
     private EnumProtocol p;
     private IChatBaseComponent q;
     private boolean r;
+    // Spigot Start
+    public static final AttributeKey<Integer> protocolVersion = new AttributeKey<Integer>("protocol_version");
+    public static final int CURRENT_VERSION = 5;
+    public static int getVersion(net.minecraft.util.io.netty.util.AttributeMap attr)
+    {
+        Integer ver = attr.attr( protocolVersion ).get();
+        return ( ver != null ) ? ver : CURRENT_VERSION;
+    }
+    public int getVersion()
+    {
+        return getVersion( this.m );
+    }
+    // Spigot End
 
     public NetworkManager(boolean flag) {
         this.j = flag;
diff --git a/src/main/java/net/minecraft/server/PacketDataSerializer.java b/src/main/java/net/minecraft/server/PacketDataSerializer.java
index f6f870f..855e85e 100644
--- a/src/main/java/net/minecraft/server/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/server/PacketDataSerializer.java
@@ -19,10 +19,19 @@ import org.bukkit.craftbukkit.inventory.CraftItemStack; // CraftBukkit
 public class PacketDataSerializer extends ByteBuf {
 
     private final ByteBuf a;
+    // Spigot Start
+    public final int version;
 
-    public PacketDataSerializer(ByteBuf bytebuf) {
+    public PacketDataSerializer(ByteBuf bytebuf)
+    {
+        this( bytebuf, NetworkManager.CURRENT_VERSION );
+    }
+
+    public PacketDataSerializer(ByteBuf bytebuf, int version) {
         this.a = bytebuf;
+        this.version = version;
     }
+    // Spigot End
 
     public static int a(int i) {
         return (i & -128) == 0 ? 1 : ((i & -16384) == 0 ? 2 : ((i & -2097152) == 0 ? 3 : ((i & -268435456) == 0 ? 4 : 5)));
diff --git a/src/main/java/net/minecraft/server/PacketEncoder.java b/src/main/java/net/minecraft/server/PacketEncoder.java
new file mode 100644
index 0000000..011a9aa
--- /dev/null
+++ b/src/main/java/net/minecraft/server/PacketEncoder.java
@@ -0,0 +1,45 @@
+package net.minecraft.server;
+
+import java.io.IOException;
+
+import net.minecraft.util.com.google.common.collect.BiMap;
+import net.minecraft.util.io.netty.buffer.ByteBuf;
+import net.minecraft.util.io.netty.channel.ChannelHandlerContext;
+import net.minecraft.util.io.netty.handler.codec.MessageToByteEncoder;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.Marker;
+import org.apache.logging.log4j.MarkerManager;
+
+public class PacketEncoder extends MessageToByteEncoder {
+
+    private static final Logger a = LogManager.getLogger();
+    private static final Marker b = MarkerManager.getMarker("PACKET_SENT", NetworkManager.b);
+    private final NetworkStatistics c;
+
+    public PacketEncoder(NetworkStatistics networkstatistics) {
+        this.c = networkstatistics;
+    }
+
+    protected void a(ChannelHandlerContext channelhandlercontext, Packet packet, ByteBuf bytebuf) throws IOException {
+        Integer integer = (Integer) ((BiMap) channelhandlercontext.channel().attr(NetworkManager.f).get()).inverse().get(packet.getClass());
+
+        if (a.isDebugEnabled()) {
+            a.debug(b, "OUT: [{}:{}] {}[{}]", new Object[] { channelhandlercontext.channel().attr(NetworkManager.d).get(), integer, packet.getClass().getName(), packet.b()});
+        }
+
+        if (integer == null) {
+            throw new IOException("Can\'t serialize unregistered packet");
+        } else {
+            PacketDataSerializer packetdataserializer = new PacketDataSerializer(bytebuf, NetworkManager.getVersion(channelhandlercontext)); // Spigot
+
+            packetdataserializer.b(integer.intValue());
+            packet.b(packetdataserializer);
+            this.c.b(integer.intValue(), (long) packetdataserializer.readableBytes());
+        }
+    }
+
+    protected void encode(ChannelHandlerContext channelhandlercontext, Object object, ByteBuf bytebuf) throws IOException {
+        this.a(channelhandlercontext, (Packet) object, bytebuf);
+    }
+}
diff --git a/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java b/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
index 7bae405..edab87b 100644
--- a/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
+++ b/src/main/java/net/minecraft/server/PacketPlayOutNamedEntitySpawn.java
@@ -68,6 +68,7 @@ public class PacketPlayOutNamedEntitySpawn extends Packet {
 
         packetdataserializer.a(uuid == null ? "" : uuid.toString());
         packetdataserializer.a(this.b.getName().length() > 16 ? this.b.getName().substring(0, 16) : this.b.getName()); // CraftBukkit - Limit name length to 16 characters
+        if (packetdataserializer.version >= 5 ) { // Spigot
         packetdataserializer.b(this.b.getProperties().size());
         Iterator iterator = this.b.getProperties().values().iterator();
 
@@ -78,6 +79,7 @@ public class PacketPlayOutNamedEntitySpawn extends Packet {
             packetdataserializer.a(property.getValue());
             packetdataserializer.a(property.getSignature());
         }
+        } // Spigot
 
         packetdataserializer.writeInt(this.c);
         packetdataserializer.writeInt(this.d);
diff --git a/src/main/java/net/minecraft/server/PacketStatusListener.java b/src/main/java/net/minecraft/server/PacketStatusListener.java
index 6423aec..f1571f1 100644
--- a/src/main/java/net/minecraft/server/PacketStatusListener.java
+++ b/src/main/java/net/minecraft/server/PacketStatusListener.java
@@ -123,7 +123,7 @@ public class PacketStatusListener implements PacketStatusInListener {
         ping.setFavicon(event.icon.value);
         ping.setMOTD(new ChatComponentText(event.getMotd()));
         ping.setPlayerSample(playerSample);
-        ping.setServerInfo(new ServerPingServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), 5)); // TODO: Update when protocol changes
+        ping.setServerInfo(new ServerPingServerData(minecraftServer.getServerModName() + " " + minecraftServer.getVersion(), networkManager.getVersion())); // TODO: Update when protocol changes
 
         this.networkManager.handle(new PacketStatusOutServerInfo(ping), new GenericFutureListener[0]);
         // CraftBukkit end
-- 
1.8.3.2