Java tutorial
/* * MultiServer - Multiple Server Communication Application * Copyright (C) 2015 Kyle Fricilone * * 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.friz.update.network.codec; import com.friz.update.network.events.FileRequestEvent; import com.friz.update.network.events.XorRequestEvent; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.ByteToMessageDecoder; import java.util.List; /** * Created by Kyle Fricilone on 9/20/2015. */ public final class UpdateDecoder extends ByteToMessageDecoder { @Override protected void decode(ChannelHandlerContext ctx, ByteBuf buffer, List<Object> out) throws Exception { if (!buffer.isReadable(6)) return; int opcode = buffer.readUnsignedByte(); if (opcode == 0 || opcode == 1) { int type = buffer.readUnsignedByte(); int file = buffer.readInt(); out.add(new FileRequestEvent(opcode == 1, type, file)); } else if (opcode == 4) { int key = buffer.readUnsignedByte(); buffer.readerIndex(buffer.readerIndex() + 4); out.add(new XorRequestEvent(key)); } else { buffer.readerIndex(buffer.readerIndex() + 5); } } }