C++ streambuf::consume方法代码示例

  // construct STOMP frame (command & header) from a streambuf
  // --------------------------------------------------
  Frame::Frame(boost::asio::streambuf& stomp_response, const stomp_server_command_map_t& cmd_map)
  // --------------------------------------------------
  {
		string _str;

		try {
			// STEP 1: find the next STOMP command line in stomp_response.
			// Chomp unknown lines till the buffer is empty, in which case an exception is raised
			//debug_print(boost::format("Frame parser phase 1, stomp_response.size()==%1%") % stomp_response.size());
			//hexdump(boost::asio::buffer_cast<const char*>(stomp_response.data()), stomp_response.size());
			while (stomp_response.size() > 0) {
				mygetline(stomp_response, _str);
				//hexdump(_str.c_str(), _str.length());
				stomp_response.consume(_str.size() + 1); // plus one for the newline
				if (cmd_map.find(_str) != cmd_map.end()) {
					//debug_print(boost::format("phase 1: COMMAND==%1%, sb.size==%2%") % _str % stomp_response.size());
					m_command = _str;
					break;
				}
			}
			// if after all this trouble m_command is not set, and there's no more data in stomp_response
			// (which shouldn't happen since we do async_read_until the double newline), then throw an exception
			if (m_command == "") throw(NoMoreFrames());

			// STEP 2: parse all headers
			//debug_print("Frame parser phase 2");
			vector< string > header_parts;
			while (stomp_response.size() > 0) {
				mygetline(stomp_response, _str);
				stomp_response.consume(_str.size()+1);
				boost::algorithm::split(header_parts, _str, is_any_of(":"));
				if (header_parts.size() > 1) {
					string& key = decode_header_token(header_parts[0]);
					string& val = decode_header_token(header_parts[1]);
					//debug_print(boost::format("phase 2: HEADER[%1%]==%2%") % key % val);
					m_headers[key] = val;
					//
				} else {
					// no valid header line detected, on to the body scanner
					break;
				}
			}
			//
		} catch(NoMoreFrames& e) {
			//debug_print("-- Frame parser ended (no more frames)");
			throw(e);
		}
  };

  // STEP 3: parse the body
  size_t Frame::parse_body(boost::asio::streambuf& _response)
  {
	  std::size_t _content_length = 0, bytecount = 0;
	  string _str;
	//debug_print("Frame parser phase 3");
	// special case: content-length
	if (m_headers.find("content-length") != m_headers.end()) {
		string& val = m_headers["content-length"];
		//debug_print(boost::format("phase 3: body content-length==%1%") % val);
		_content_length = lexical_cast<size_t>(val);
	}
	if (_content_length > 0) {
		bytecount += _content_length;
		// read back the body byte by byte
		const char* rawdata = boost::asio::buffer_cast<const char*>(_response.data());
		for (size_t i = 0; i < _content_length; i++ ) {
			m_body << rawdata[i];
		}
	} else {
		// read all bytes until the first NULL
		mygetline(_response, _str, '\0');
		bytecount += _str.size();
		m_body << _str;
	}
	bytecount += 1; // for the final frame-terminating NULL
	//debug_print(boost::format("phase 3: consumed %1% bytes, BODY(%2% bytes)==%3%") % bytecount % _str.size() % _str);
	_response.consume(bytecount);
	return(bytecount);
  }

bool EmptyData::Fill(boost::asio::streambuf& buf)
{
	assert(Size() != UNDEFINED_SIZE);

	uint32_t pos = Pos();
	const uint32_t copyBytes = std::min(buf.size(), Size() - pos);
	buf.consume(copyBytes);
	SetPos(pos + copyBytes);

	return true;
}

		void on_recv_(const boost::system::error_code& error, size_t bytes_transferred)
		{
			if(error && error != boost::asio::error::eof) {
				std::cout << "receive failed: " << error.message() << std::endl;
			} else {
				const char* data = asio::buffer_cast<const char*>(recv_.data());
				std::cout << "response(" << bytes_transferred << "): ";
				std::cout << data << std::endl;
				recv_.consume(recv_.size());
				read_trg_ = true;
			}
		}

    void handle_line(const boost::system::error_code& error, size_t bytes_received) {
        if(!error) {
            boost::asio::streambuf::const_buffers_type bufs = m_buffer.data();
            std::string line(boost::asio::buffers_begin(bufs),
                             boost::asio::buffers_begin(bufs) + bytes_received);

            std::cerr << "Sentence: " << line << std::endl;

            m_buffer.consume(bytes_received);

            read_next();
        } else {
            std::cerr << "Error: " << error << std::endl;
        }
    }

	void run_event_loop_until_frame_received()
	{
		using boost::bind;
		have_frame = false;
		buffer.consume(buffer.size());
		last_error = boost::system::error_code();
		boost::asio::async_read_until(socket,
									  buffer,
									  "END\r\n",
									  bind(&TimedSessionBase::handle_frame_reception,
										   this,
										   boost::asio::placeholders::error,
										   boost::asio::placeholders::bytes_transferred));
		service.reset();
		while (!last_error && !have_frame) {
			service.poll();
			service.reset();
			check_if_timed_out();
		}
	}