00001 // $Id: PacketType.ct 1742 2010-11-04 14:51:56Z g0dil $ 00002 // 00003 // Copyright (C) 2008 00004 // Fraunhofer (FOKUS) 00005 // Competence Center NETwork research (NET), St. Augustin, GERMANY 00006 // Stefan Bund <g0dil@berlios.de> 00007 // 00008 // This program is free software; you can redistribute it and/or modify 00009 // it under the terms of the GNU General Public License as published by 00010 // the Free Software Foundation; either version 2 of the License, or 00011 // (at your option) any later version. 00012 // 00013 // This program is distributed in the hope that it will be useful, 00014 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00015 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00016 // GNU General Public License for more details. 00017 // 00018 // You should have received a copy of the GNU General Public License 00019 // along with this program; if not, write to the 00020 // Free Software Foundation, Inc., 00021 // 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 00022 00026 //#include "PacketType.ih" 00027 00028 // Custom includes 00029 00030 #define prefix_ 00031 //-///////////////////////////////////////////////////////////////////////////////////////////////// 00032 00033 //-///////////////////////////////////////////////////////////////////////////////////////////////// 00034 // senf::PacketTypeMixin<Self,void> 00035 00036 template <class Self> 00037 prefix_ senf::PacketInterpreterBase::optional_range 00038 senf::PacketTypeMixin<Self,void>::nextPacketRange(ConcretePacket<Self> const & p) 00039 { 00040 typename Self::size_type sz (Self::initHeadSize()); 00043 if (sz == PacketTypeBase::size_type(-1)) { 00044 typename Self::size_type headsz (bytes(p.parser())); 00045 return p.data().size() < headsz ? 00046 PacketTypeBase::no_range() : 00047 PacketInterpreterBase::optional_range( 00048 PacketTypeBase::range(boost::next(p.data().begin(), headsz), 00049 p.data().end())); 00050 } 00051 else 00052 // If we have a trailer, we do *not* use the 'bytes' value but initSize/initHeadSize, this 00053 // is much safer since the bytes() value will probably not be very correct anyways (what 00054 // should it return ? the size of the header only, the combined size of header and trailer 00055 // or the size of the packet from header to trailer including payload?). 00056 // 00057 // So, the helper only works with fixed-size parsers if the packet has a trailer. 00058 return p.data().size() < Self::initSize() ? 00059 PacketTypeBase::no_range() : 00060 PacketInterpreterBase::optional_range( 00061 PacketTypeBase::range(boost::next(p.data().begin(),sz), 00062 boost::prior(p.data().end(),Self::initSize()-sz))); 00063 } 00064 00065 //-///////////////////////////////////////////////////////////////////////////////////////////////// 00066 #undef prefix_ 00067 00068 00069 // Local Variables: 00070 // mode: c++ 00071 // fill-column: 100 00072 // comment-column: 40 00073 // c-file-style: "senf" 00074 // indent-tabs-mode: nil 00075 // ispell-local-dictionary: "american" 00076 // compile-command: "scons -u test" 00077 // End: