Packets/MPEGDVBBundle/TLVPacket.hh

   1 // $Id$
   2 //
   3 // Copyright (C) 2007
   4 // Fraunhofer Institut fuer offene Kommunikationssysteme (FOKUS)
   5 // Kompetenzzentrum fuer Satelitenkommunikation (SatCom)
   6 //     Thorsten Horstmann <thorsten.horstmann@fokus.fraunhofer.de>
   7 //
   8 // This program is free software; you can redistribute it and/or modify
   9 // it under the terms of the GNU General Public License as published by
  10 // the Free Software Foundation; either version 2 of the License, or
  11 // (at your option) any later version.
  12 //
  13 // This program is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License
  19 // along with this program; if not, write to the
  20 // Free Software Foundation, Inc.,
  21 // 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  22
  23 /** \file
  24     \brief TLVPacket public header */
  25
  26 #ifndef HH_TLVPacket_
  27 #define HH_TLVPacket_ 1
  28
  29 // Custom includes
  30 #include <algorithm>
  31 #include "../../Packets/PacketType.hh"
  32 #include "../../Packets/ParseInt.hh"
  33 #include "../../Packets/PacketParser.hh"
  34
  35 //#include "TLVPacket.mpp"
  36 ///////////////////////////////hh.p////////////////////////////////////////
  37
  38 namespace senf {
  39
  40     struct UnsuportedTLVPacketException : public std::exception
  41     {
  42         virtual char const * what() const throw() {
  43             return "length of length can be max. 4 bytes. Sorry.";
  44         }
  45     };
  46
  47     struct Parse_TLVPacketLength
  48         : public detail::packet::ParseIntOps<Parse_TLVPacketLength, boost::uint32_t>,
  49           public PacketParserBase
  50     {
  51 #       ifndef DOXYGEN
  52
  53         SENF_PACKET_PARSER_NO_INIT(Parse_TLVPacketLength);
  54
  55 #       endif
  56
  57         typedef boost::uint32_t value_type;
  58
  59         typedef Parse_Flag      <    0 > Parse_extended_length_flag;
  60         typedef Parse_UIntField < 1, 8 > Parse_fixed_length;
  61
  62         Parse_extended_length_flag extended_length_flag() const {
  63             return parse<Parse_extended_length_flag>( 0 );
  64         }
  65
  66         Parse_fixed_length fixed_length_field() const {
  67             return parse<Parse_fixed_length>( 0 );
  68         }
  69
  70         value_type value() const {
  71             switch( bytes() ) {
  72                 case 1:
  73                     return fixed_length_field().value();
  74                 case 2:
  75                     return parse<Parse_UInt8>( 1 ).value();
  76                 case 3:
  77                     return parse<Parse_UInt16>( 1 ).value();
  78                 case 4:
  79                     return parse<Parse_UInt24>( 1 ).value();
  80                 case 5:
  81                     return parse<Parse_UInt32>( 1 ).value();
  82                 default:
  83                     throw(UnsuportedTLVPacketException());
  84             };
  85         }
  86
  87         static const size_type init_bytes = 1;
  88
  89         size_type bytes() const {
  90             if ( extended_length_flag() )
  91                 return 1 + fixed_length_field();
  92             else
  93                 return 1;
  94         }
  95
  96         void init() const {
  97             defaultInit();
  98             extended_length_flag() = 0;
  99         }
 100
 101     };
 102
 103     /** \brief parse TLVPacket Packet
 104
 105         XXX
 106
 107         \see TLVPacketType
 108      */
 109     struct Parse_TLVPacket : public PacketParserBase
 110     {
 111 #       ifndef DOXYGEN
 112
 113         SENF_PACKET_PARSER_INIT(Parse_TLVPacket);
 114
 115         SENF_PACKET_PARSER_DEFINE_FIELDS(
 116             ((Field)( type,   Parse_UInt32          ))
 117             ((Field)( length, Parse_TLVPacketLength ))
 118         );
 119
 120 #       endif
 121     };
 122
 123     /** \brief TLV Packet
 124
 125         \par Packet type (typedef):
 126             \ref TLVPacket
 127
 128         \par Fields:
 129             \ref Parse_TLVPacket
 130
 131         \ingroup protocolbundle_mpegdvb
 132      */
 133     struct TLVPacketType
 134         : public PacketTypeBase
 135     {
 136         typedef ConcretePacket<TLVPacketType> packet;
 137         typedef Parse_TLVPacket parser;
 138
 139         static optional_range nextPacketRange(packet p);
 140
 141         static void dump(packet p, std::ostream & os);
 142     };
 143
 144     typedef TLVPacketType::packet TLVPacket;
 145
 146 }
 147
 148
 149 ///////////////////////////////hh.e////////////////////////////////////////
 150 //#include "TLVPacket.cci"
 151 //#include "TLVPacket.ct"
 152 //#include "TLVPacket.cti"
 153 #endif
 154
 155 \f
 156 // Local Variables:
 157 // mode: c++
 158 // fill-column: 100
 159 // c-file-style: "senf"
 160 // indent-tabs-mode: nil
 161 // ispell-local-dictionary: "american"
 162 // compile-command: "scons -u test"
 163 // comment-column: 40
 164 // End: