epan/dissectors/packet-dvb-tot.c

   1 /* packet-dvb-tot.c
   2  * Routines for DVB (ETSI EN 300 468) Time Offset Table (TOT) dissection
   3  * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License along
  22  * with this program; if not, write to the Free Software Foundation, Inc.,
  23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #include "config.h"
  27
  28 #include <glib.h>
  29
  30 #include <epan/packet.h>
  31 #include <epan/dissectors/packet-mpeg-sect.h>
  32
  33 #include "packet-mpeg-descriptor.h"
  34
  35 void proto_register_dvb_tot(void);
  36 void proto_reg_handoff_dvb_tot(void);
  37
  38 static int proto_dvb_tot = -1;
  39 static int hf_dvb_tot_utc_time = -1;
  40 static int hf_dvb_tot_reserved = -1;
  41 static int hf_dvb_tot_descriptors_loop_length = -1;
  42
  43 static gint ett_dvb_tot = -1;
  44
  45 #define DVB_TOT_TID                             0x73
  46
  47 #define DVB_TOT_RESERVED_MASK                   0xF000
  48 #define DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK    0x0FFF
  49
  50 static void
  51 dissect_dvb_tot(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
  52 {
  53
  54     guint       offset = 0;
  55     guint       descriptor_len;
  56
  57     proto_item *ti;
  58     proto_tree *dvb_tot_tree;
  59
  60     nstime_t    utc_time;
  61
  62     col_set_str(pinfo->cinfo, COL_INFO, "Time Offset Table (TOT)");
  63
  64     ti = proto_tree_add_item(tree, proto_dvb_tot, tvb, offset, -1, ENC_NA);
  65     dvb_tot_tree = proto_item_add_subtree(ti, ett_dvb_tot);
  66
  67     offset += packet_mpeg_sect_header(tvb, offset, dvb_tot_tree, NULL, NULL);
  68
  69     if (packet_mpeg_sect_mjd_to_utc_time(tvb, offset, &utc_time) < 0) {
  70         proto_tree_add_text(dvb_tot_tree, tvb, offset, 5, "UTC Time : Unparseable time");
  71     } else {
  72         proto_tree_add_time(dvb_tot_tree, hf_dvb_tot_utc_time, tvb, offset, 5, &utc_time);
  73     }
  74
  75     offset += 5;
  76
  77     descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK;
  78     proto_tree_add_item(dvb_tot_tree, hf_dvb_tot_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
  79     proto_tree_add_item(dvb_tot_tree, hf_dvb_tot_descriptors_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
  80     offset += 2;
  81
  82     offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_tot_tree);
  83
  84     offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_tot_tree, 0, offset);
  85     proto_item_set_len(ti, offset);
  86 }
  87
  88
  89 void
  90 proto_register_dvb_tot(void)
  91 {
  92
  93     static hf_register_info hf[] = {
  94
  95         { &hf_dvb_tot_utc_time, {
  96             "UTC Time", "dvb_tot.utc_time",
  97             FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0, NULL, HFILL
  98         } },
  99
 100         { &hf_dvb_tot_reserved, {
 101             "Reserved", "dvb_tot.reserved",
 102             FT_UINT16, BASE_HEX, NULL, DVB_TOT_RESERVED_MASK, NULL, HFILL
 103         } },
 104
 105         { &hf_dvb_tot_descriptors_loop_length, {
 106              "Descriptors Loop Length", "dvb_tot.descr_loop_len",
 107              FT_UINT16, BASE_DEC, NULL, DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK, NULL, HFILL
 108         } }
 109     };
 110
 111     static gint *ett[] = {
 112         &ett_dvb_tot
 113     };
 114
 115     proto_dvb_tot = proto_register_protocol("DVB Time Offset Table", "DVB TOT", "dvb_tot");
 116
 117     proto_register_field_array(proto_dvb_tot, hf, array_length(hf));
 118     proto_register_subtree_array(ett, array_length(ett));
 119
 120 }
 121
 122
 123 void proto_reg_handoff_dvb_tot(void)
 124 {
 125     dissector_handle_t dvb_tot_handle;
 126
 127     dvb_tot_handle = create_dissector_handle(dissect_dvb_tot, proto_dvb_tot);
 128
 129     dissector_add_uint("mpeg_sect.tid", DVB_TOT_TID, dvb_tot_handle);
 130 }
 131
 132 /*
 133  * Editor modelines  -  http://www.wireshark.org/tools/modelines.html
 134  *
 135  * Local variables:
 136  * c-basic-offset: 4
 137  * tab-width: 8
 138  * indent-tabs-mode: nil
 139  * End:
 140  *
 141  * vi: set shiftwidth=4 tabstop=8 expandtab:
 142  * :indentSize=4:tabSize=8:noTabs=true:
 143  */