/*
 * Copyright 2012 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.codec.socks;

import io.netty.buffer.ByteBuf;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.ReplayingDecoder;
import io.netty.handler.codec.socks.SocksInitResponseDecoder.State;

import java.util.List;

Decodes ByteBufs into SocksInitResponse. Before returning SocksResponse decoder removes itself from pipeline.
/** * Decodes {@link ByteBuf}s into {@link SocksInitResponse}. * Before returning SocksResponse decoder removes itself from pipeline. */
public class SocksInitResponseDecoder extends ReplayingDecoder<State> { public SocksInitResponseDecoder() { super(State.CHECK_PROTOCOL_VERSION); } @Override protected void decode(ChannelHandlerContext ctx, ByteBuf byteBuf, List<Object> out) throws Exception { switch (state()) { case CHECK_PROTOCOL_VERSION: { if (byteBuf.readByte() != SocksProtocolVersion.SOCKS5.byteValue()) { out.add(SocksCommonUtils.UNKNOWN_SOCKS_RESPONSE); break; } checkpoint(State.READ_PREFERRED_AUTH_TYPE); } case READ_PREFERRED_AUTH_TYPE: { SocksAuthScheme authScheme = SocksAuthScheme.valueOf(byteBuf.readByte()); out.add(new SocksInitResponse(authScheme)); break; } default: { throw new Error(); } } ctx.pipeline().remove(this); } enum State { CHECK_PROTOCOL_VERSION, READ_PREFERRED_AUTH_TYPE } }