anchor.diff:    Future sendMessage(TorrentMessage message) async {
       List<int> data = await message.encode();
       await _socket.send(data);
  +    print("send : ${message}");
       TorrentClientFrontNerve.doSendMessage(this, message);
       return {};
     }
  
positive.code: 
    startReceive() async {
      try {
        Uint8List cash = new Uint8List(3*16*1024);
        while (true) {
          TorrentMessage message = await parse(cash);
          TorrentClientFrontNerve.doReceiveMessage(this, message);
  
negative.code:   Future<TorrentMessage> parse(List<int> cash) async {
      if (handshaked == false) {
        TorrentMessage message = await TorrentMessage.parseHandshake(_parser);
        print("recv : ${message}");
        handshaked = true;
        return message;
      } else {
        (_parser.buffer as ArrayBuilder).rawbuffer8.logon = true;
        TorrentMessage message = await TorrentMessage.parseBasic(_parser, maxOfMessageSize: requestedMaxPieceSize + 20, buffer:cash);
        print("recv : ${message}");
        //print("## -[1]-> ## ${_parser.index} ${(_parser.buffer as ArrayBuilder).rawbuffer8.length}");
        (_parser.buffer as ArrayBuilder).clearInnerBuffer(_parser.index, reuse:true);
        //print("## -[2]-> ##${(_parser.buffer as ArrayBuilder).rawbuffer8.rawbuffer8.length} ${_parser.stack.length}");
  