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Nadron is a high speed socket based java game server written using Netty and Mike Rettig's Jetlang. It is specifically tuned for network based multiplayer games and supports TCP and UDP network protocols.

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package io.nadron.handlers.netty;

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

@Sharable
public class NulEncoder extends MessageToByteEncoder {

	private static final ByteBuf NULL_BUFFER = Unpooled.wrappedBuffer(new byte[] { 0 });
	
	@Override
	protected void encode(ChannelHandlerContext ctx, ByteBuf msg, ByteBuf out)
			throws Exception {
		out.writeBytes(Unpooled.wrappedBuffer(msg,NULL_BUFFER));
	}
	
}