/* * Copyright (C) 2020 Nan1t * * 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 . */ package ua.nanit.limbo.connection.pipeline; import io.netty.buffer.ByteBuf; import io.netty.channel.ChannelHandlerContext; import io.netty.handler.codec.MessageToMessageDecoder; import ua.nanit.limbo.protocol.ByteMessage; import ua.nanit.limbo.protocol.Packet; import ua.nanit.limbo.protocol.registry.State; import ua.nanit.limbo.protocol.registry.Version; import ua.nanit.limbo.server.Log; import java.util.List; public class PacketDecoder extends MessageToMessageDecoder { private State.PacketRegistry mappings; private Version version; public PacketDecoder() { updateVersion(Version.getMin()); updateState(State.HANDSHAKING); } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf buf, List out) throws Exception { if (!ctx.channel().isActive() || mappings == null) return; ByteMessage msg = new ByteMessage(buf); int packetId = msg.readVarInt(); Packet packet = mappings.getPacket(packetId); if (packet != null) { Log.debug("Received packet %s[0x%s] (%d bytes)", packet.toString(), Integer.toHexString(packetId), msg.readableBytes()); try { packet.decode(msg, version); } catch (Exception e) { if (Log.isDebug()) { Log.warning("Cannot decode packet 0x%s", e, Integer.toHexString(packetId)); } else { Log.warning("Cannot decode packet 0x%s: %s", Integer.toHexString(packetId), e.getMessage()); } } ctx.fireChannelRead(packet); } else { Log.debug("Undefined incoming packet: 0x" + Integer.toHexString(packetId)); } } public void updateVersion(Version version) { this.version = version; } public void updateState(State state) { this.mappings = state.serverBound.getRegistry(version); } }