Fix SubChunkPacket serialization

Author: SupremeMortal

bedrock/bedrock-v471/src/main/java/com/nukkitx/protocol/bedrock/v471/serializer/SubChunkSerializer_v471.java

@@ -12,16 +12,19 @@
 
 @NoArgsConstructor(access = AccessLevel.PROTECTED)
 public class SubChunkSerializer_v471 implements BedrockPacketSerializer<SubChunkPacket> {
+
     public static final SubChunkSerializer_v471 INSTANCE = new SubChunkSerializer_v471();
 
+    protected static final int HEIGHT_MAP_LENGTH = 256;
+
     @Override
     public void serialize(ByteBuf buffer, BedrockPacketHelper helper, SubChunkPacket packet) {
         VarInts.writeInt(buffer, packet.getDimension());
         helper.writeVector3i(buffer, packet.getSubChunkPosition());
         helper.writeByteArray(buffer, packet.getData());
         VarInts.writeInt(buffer, packet.getResult().ordinal());
         buffer.writeByte(packet.getHeightMapType().ordinal());
-        buffer.writeBytes(packet.getHeightMapData());
+        buffer.writeBytes(packet.getHeightMapData(), 0, HEIGHT_MAP_LENGTH);
     }
 
     @Override
@@ -32,9 +35,8 @@ public void deserialize(ByteBuf buffer, BedrockPacketHelper helper, SubChunkPack
         packet.setResult(SubChunkRequestResult.values()[VarInts.readInt(buffer)]);
         packet.setHeightMapType(HeightMapDataType.values()[buffer.readByte()]);
 
-        ByteBuf heightMapBuffer = buffer.readBytes(buffer.readableBytes());
-        byte[] heightMap = new byte[heightMapBuffer.readableBytes()];
-        heightMapBuffer.readBytes(heightMap);
+        byte[] heightMap = new byte[HEIGHT_MAP_LENGTH];
+        buffer.readBytes(heightMap);
 
         packet.setHeightMapData(heightMap);
     }

bedrock/bedrock-v475/src/main/java/com/nukkitx/protocol/bedrock/v475/serializer/SubChunkSerializer_v475.java

@@ -20,7 +20,7 @@ public void serialize(ByteBuf buffer, BedrockPacketHelper helper, SubChunkPacket
         buffer.writeByte(packet.getHeightMapType().ordinal());
         if (packet.getHeightMapType() == HeightMapDataType.HAS_DATA) {
             byte[] heightMapBuf = packet.getHeightMapData();
-            buffer.writeBytes(heightMapBuf);
+            buffer.writeBytes(heightMapBuf, 0, HEIGHT_MAP_LENGTH);
         }
         buffer.writeBoolean(packet.isCacheEnabled());
         if (packet.isCacheEnabled()) {
@@ -37,9 +37,8 @@ public void deserialize(ByteBuf buffer, BedrockPacketHelper helper, SubChunkPack
         packet.setHeightMapType(HeightMapDataType.values()[buffer.readByte()]);
 
         if (packet.getHeightMapType() == HeightMapDataType.HAS_DATA) {
-            ByteBuf heightMapBuffer = buffer.readBytes(buffer.readableBytes());
-            byte[] heightMap = new byte[heightMapBuffer.readableBytes()];
-            heightMapBuffer.readBytes(heightMap);
+            byte[] heightMap = new byte[HEIGHT_MAP_LENGTH];
+            buffer.readBytes(heightMap);
         }
         packet.setCacheEnabled(buffer.readBoolean());
         if (packet.isCacheEnabled()) {