tcr/java/src/game/network/NettyCompressionEncoder.java

package game.network;

import java.util.zip.Deflater;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.MessageToByteEncoder;

public class NettyCompressionEncoder extends MessageToByteEncoder<ByteBuf>
{
    private final byte[] buffer = new byte[8192];
    private final Deflater deflater;
    private int treshold;

    public NettyCompressionEncoder(int treshold)
    {
        this.treshold = treshold;
        this.deflater = new Deflater();
    }

    protected void encode(ChannelHandlerContext p_encode_1_, ByteBuf p_encode_2_, ByteBuf p_encode_3_) throws Exception
    {
        int i = p_encode_2_.readableBytes();
        PacketBuffer packetbuffer = new PacketBuffer(p_encode_3_);

        if (i < this.treshold)
        {
            packetbuffer.writeVarIntToBuffer(0);
            packetbuffer.writeBytes(p_encode_2_);
        }
        else
        {
            byte[] abyte = new byte[i];
            p_encode_2_.readBytes(abyte);
            packetbuffer.writeVarIntToBuffer(abyte.length);
            this.deflater.setInput(abyte, 0, i);
            this.deflater.finish();

            while (!this.deflater.finished())
            {
                int j = this.deflater.deflate(this.buffer);
                packetbuffer.writeBytes((byte[])this.buffer, 0, j);
            }

            this.deflater.reset();
        }
    }

    public void setCompressionTreshold(int treshold)
    {
        this.treshold = treshold;
    }
}