Java tutorial
/* * This file is part of Pingy, licensed under the MIT License (MIT). * * Copyright (c) LanternPowered <https://www.lanternpowered.org> * Copyright (c) contributors * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the Software), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, andor sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. */ package org.lanternpowered.pingy; import static org.lanternpowered.pingy.PingyBufUtils.readVarInt; import static org.lanternpowered.pingy.PingyBufUtils.readableVarInt; import static org.lanternpowered.pingy.PingyBufUtils.writeVarInt; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.ByteToMessageCodec; import java.util.List; public final class PingyFramingHandler extends ByteToMessageCodec<ByteBuf> { @Override protected void encode(ChannelHandlerContext ctx, ByteBuf buf0, ByteBuf output) throws Exception { writeVarInt(output, buf0.readableBytes()); output.writeBytes(buf0); } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List<Object> output) throws Exception { while (readableVarInt(buf)) { buf.markReaderIndex(); final int length = readVarInt(buf); if (buf.readableBytes() < length) { buf.resetReaderIndex(); break; } final ByteBuf msg = ctx.alloc().buffer(length); buf.readBytes(msg, length); output.add(msg); } } }