com.l2jmobius.commons.network.codecs.LengthFieldBasedFrameEncoder.java Source code

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/*
 * This file is part of the L2J Mobius project.
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
package com.l2jmobius.commons.network.codecs;

import java.nio.ByteOrder;
import java.util.List;

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

/**
 * @author Nos
 */
@Sharable
public class LengthFieldBasedFrameEncoder extends MessageToMessageEncoder<ByteBuf> {
    @Override
    protected void encode(ChannelHandlerContext ctx, ByteBuf msg, List<Object> out) {
        final ByteBuf buf = ctx.alloc().buffer(2);
        final short length = (short) (msg.readableBytes() + 2);
        buf.writeShort(buf.order() != ByteOrder.LITTLE_ENDIAN ? Short.reverseBytes(length) : length);
        out.add(buf);
        out.add(msg.retain());
    }
}