From 2e1de306fb41bddecb2991fa907610606a835cb3 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Thu, 9 Aug 2018 10:14:44 -0400
Subject: [PATCH] Complete tab-complete support back to Minecraft 1.8.

---
 .../velocitypowered/proxy/protocol/StateRegistry.java    | 7 ++++++-
 .../proxy/protocol/packet/TabCompleteRequest.java        | 9 +++++++--
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java b/proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java
index fea896527..43f79eb8e 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java
@@ -33,7 +33,10 @@ public enum StateRegistry {
     PLAY {
         {
             SERVERBOUND.register(TabCompleteRequest.class, TabCompleteRequest::new,
-                    map(0x01, MINECRAFT_1_12_2),
+                    map(0x14, MINECRAFT_1_8),
+                    map(0x01, MINECRAFT_1_9),
+                    map(0x02, MINECRAFT_1_12),
+                    map(0x01, MINECRAFT_1_12_1),
                     map(0x05, MINECRAFT_1_13));
             SERVERBOUND.register(Chat.class, Chat::new,
                     map(0x01, MINECRAFT_1_8),
@@ -69,6 +72,8 @@ public enum StateRegistry {
                     map(0x0F, MINECRAFT_1_12),
                     map(0x0E, MINECRAFT_1_13));
             CLIENTBOUND.register(TabCompleteResponse.class, TabCompleteResponse::new,
+                    map(0x3A, MINECRAFT_1_8),
+                    map(0x0E, MINECRAFT_1_9),
                     map(0x0E, MINECRAFT_1_12),
                     map(0x10, MINECRAFT_1_13));
             CLIENTBOUND.register(PluginMessage.class, PluginMessage::new,
diff --git a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequest.java b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequest.java
index 94d80b66e..10c14b400 100644
--- a/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequest.java
+++ b/proxy/src/main/java/com/velocitypowered/proxy/protocol/packet/TabCompleteRequest.java
@@ -6,6 +6,7 @@ import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
 
 import static com.velocitypowered.proxy.protocol.ProtocolConstants.MINECRAFT_1_13;
+import static com.velocitypowered.proxy.protocol.ProtocolConstants.MINECRAFT_1_9;
 
 public class TabCompleteRequest implements MinecraftPacket {
     private int transactionId;
@@ -72,7 +73,9 @@ public class TabCompleteRequest implements MinecraftPacket {
             this.command = ProtocolUtils.readString(buf);
         } else {
             this.command = ProtocolUtils.readString(buf);
-            this.assumeCommand = buf.readBoolean();
+            if (protocolVersion >= MINECRAFT_1_9) {
+                this.assumeCommand = buf.readBoolean();
+            }
             this.hasPosition = buf.readBoolean();
             if (hasPosition) {
                 this.position = buf.readLong();
@@ -87,7 +90,9 @@ public class TabCompleteRequest implements MinecraftPacket {
             ProtocolUtils.writeString(buf, command);
         } else {
             ProtocolUtils.writeString(buf, command);
-            buf.writeBoolean(assumeCommand);
+            if (protocolVersion >= MINECRAFT_1_9) {
+                buf.writeBoolean(assumeCommand);
+            }
             buf.writeBoolean(hasPosition);
             if (hasPosition) {
                 buf.writeLong(position);