Java tutorial
/* * 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()); } }