src/protocol.cc

   1 ///
   2 /// \file       protocol.cc
   3 ///             USB Blackberry bulk protocol API
   4 ///
   5
   6 /*
   7     Copyright (C) 2005-2009, Net Direct Inc. (http://www.netdirect.ca/)
   8
   9     This program is free software; you can redistribute it and/or modify
  10     it under the terms of the GNU General Public License as published by
  11     the Free Software Foundation; either version 2 of the License, or
  12     (at your option) any later version.
  13
  14     This program is distributed in the hope that it will be useful,
  15     but WITHOUT ANY WARRANTY; without even the implied warranty of
  16     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  17
  18     See the GNU General Public License in the COPYING file at the
  19     root directory of this project for more details.
  20 */
  21
  22 #include "protocol.h"
  23 #include "protostructs.h"
  24 #include "data.h"
  25 #include "endian.h"
  26 #include "error.h"
  27 #include "debug.h"
  28
  29 #include <sstream>
  30
  31 namespace Barry { namespace Protocol {
  32
  33 void CheckSize(const Data &packet, size_t requiredsize)
  34 {
  35         const Packet *p = (const Packet *) packet.GetData();
  36
  37         // when packets are larger than 0xFFFF bytes, packet->size is no
  38         // longer reliable, so we go with the Data class size
  39         if( (btohs(p->size) != packet.GetSize() && packet.GetSize() <= 0xFFFF) ||
  40             packet.GetSize() < requiredsize )
  41
  42         {
  43                 BadSize bs(btohs(p->size), packet.GetSize(), requiredsize);
  44                 eout(bs.what());
  45                 eout(packet);
  46                 throw bs;
  47         }
  48 }
  49
  50 unsigned int GetSize(const Data &packet)
  51 {
  52         CheckSize(packet, 4);
  53
  54         // when packets are larger than 0xFFFF bytes, packet->size is no
  55         // longer reliable, so we go with the Data class size
  56         if( packet.GetSize() > 0xFFFF ) {
  57                 return packet.GetSize();
  58         }
  59         else {
  60                 const Packet *p = (const Packet *) packet.GetData();
  61                 return btohs(p->size);
  62         }
  63 }
  64
  65 }} // namespace Barry::Protocol
  66