developer.intra2net.com Git - libt2n/blob - src/connection.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2006 by Gerd v. Egidy                                   *
   3  *   gve@intra2net.com                                                     *
   4  *                                                                         *
   5  *   This library is free software; you can redistribute it and/or modify  *
   6  *   it under the terms of the GNU Lesser General Public License version   *
   7  *   2.1 as published by the Free Software Foundation.                     *
   8  *                                                                         *
   9  *   This library is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU Lesser General Public License for more details.                   *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU Lesser General Public      *
  15  *   License along with this program; if not, write to the                 *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
  18  ***************************************************************************/
  19
  20 #include <string>
  21 #include <sstream>
  22
  23 #include "connection.hxx"
  24
  25 namespace libt2n
  26 {
  27
  28 connection::packet_size_indicator connection::bytes_available()
  29 {
  30     // max packet size is unsigned int
  31
  32     // no size information -> no packet
  33     if (buffer.size() < sizeof(unsigned int))
  34         return 0;
  35
  36     packet_size_indicator psize=*((packet_size_indicator*)(buffer.data()));
  37
  38     // enough data for one packet in buffer?
  39     if (buffer.size() < sizeof(unsigned int)+psize)
  40         return 0;
  41
  42     // ok, full packet there
  43     return psize;
  44 }
  45
  46 /** @brief read a complete data packet from the buffer. The packet is removed from the
  47             connection buffer.
  48     @param[out] data the data package
  49     @retval true if packet found
  50 */
  51 bool connection::get_packet(std::string& data)
  52 {
  53     packet_size_indicator psize;
  54
  55     if ((psize=bytes_available()))
  56     {
  57         data.assign(buffer,sizeof(unsigned int),psize);
  58         buffer.erase(0,sizeof(unsigned int)+psize);
  59         return true;
  60     }
  61     else
  62         return false;
  63 }
  64
  65 /// send a blob to the peer
  66 void connection::write(const std::string& data)
  67 {
  68     // prepend packet size to data
  69     packet_size_indicator psize=data.size();
  70     std::string send_data(data);
  71     send_data.insert(0,(char*)&psize,sizeof(packet_size_indicator));
  72
  73     real_write(send_data);
  74 }
  75
  76 }