Patch Packet Custom Payload

Author: gungun974

src/main/java/turniplabs/halplibe/mixin/PacketCustomPayloadMixin.java

@@ -0,0 +1,34 @@
+package turniplabs.halplibe.mixin;
+
+import net.minecraft.core.net.packet.PacketCustomPayload;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.Overwrite;
+import org.spongepowered.asm.mixin.Shadow;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+
+import static net.minecraft.core.net.packet.Packet.readStringUTF8;
+
+@Mixin(value = PacketCustomPayload.class, remap = false)
+public class PacketCustomPayloadMixin {
+    @Shadow
+    public String channel;
+
+    @Shadow
+    public byte[] data;
+
+    /**
+     * @author gungun974
+     * @reason Make BTA read every byte of the PacketCustomPayload to prevent read misalignment
+     */
+    @Overwrite
+    public void read(DataInputStream in) throws IOException {
+        this.channel = readStringUTF8(in, 128);
+        int length = in.readInt();
+        if (length > 0 && length < 32768) {
+            this.data = new byte[length];
+            in.readFully(this.data, 0, length);
+        }
+    }
+}

src/main/resources/halplibe.mixins.json

@@ -7,6 +7,7 @@
     "I18nMixin",
     "ItemsMixin",
     "MobCreeperMixin",
+    "PacketCustomPayloadMixin",
     "accessors.BlockAccessor",
     "accessors.BlocksAccessor",
     "accessors.ItemsAccessor",
@@ -28,10 +29,10 @@
     "models.TileEntityRendererDispatcherMixin"
   ],
   "server": [
-    "accessors.PacketHandlerServerAccessor",
     "MinecraftServerMixin",
     "PacketHandlerLoginMixin",
-    "PacketHandlerServerMixin"
+    "PacketHandlerServerMixin",
+    "accessors.PacketHandlerServerAccessor"
   ],
   "injectors": {
     "defaultRequire": 1