ChannelBuffer buf = ChannelBuffers.dynamicBuffer();

buf.writeInt(x);
buf.writeShort(y);
buf.writeInt(z);
buf.writeByte(Chunk.WIDTH - 1);
buf.writeByte(Chunk.HEIGHT - 1);
buf.writeByte(Chunk.LENGTH - 1);

byte[] compressedData = new byte[(Chunk.WIDTH * Chunk.LENGTH * Chunk.HEIGHT * 5) / 2]; // 81,920

Deflater deflater = new Deflater(Deflater.BEST_SPEED);
deflater.setInput(data);
deflater.finish();

int compressed = deflater.deflate(compressedData);
deflater.end();

buf.writeInt(compressed);
buf.writeBytes(compressedData, 0, compressed);

return buf;