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  * Wireshark - Network traffic analyzer
   6  * By Gerald Combs <gerald@wireshark.org>
   7  * Copyright 1998 Gerald Combs
   8  *
   9  * SPDX-License-Identifier: GPL-2.0-or-later
  10  */
  11
  12 #include "config.h"
  13
  14 #include <epan/packet.h>
  15 #include "packet-mpeg-sect.h"
  16
  17 #include "packet-mpeg-descriptor.h"
  18
  19 void proto_register_dvb_tot(void);
  20 void proto_reg_handoff_dvb_tot(void);
  21
  22 static dissector_handle_t dvb_tot_handle;
  23
  24 static int proto_dvb_tot;
  25 static int hf_dvb_tot_utc_time;
  26 static int hf_dvb_tot_reserved;
  27 static int hf_dvb_tot_descriptors_loop_length;
  28
  29 static int ett_dvb_tot;
  30
  31 #define DVB_TOT_RESERVED_MASK                   0xF000
  32 #define DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK    0x0FFF
  33
  34 static int
  35 dissect_dvb_tot(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
  36 {
  37     unsigned    offset = 0;
  38     unsigned    descriptor_len;
  39
  40     proto_item *ti;
  41     proto_tree *dvb_tot_tree;
  42
  43     nstime_t    utc_time;
  44
  45     col_set_str(pinfo->cinfo, COL_INFO, "Time Offset Table (TOT)");
  46
  47     ti = proto_tree_add_item(tree, proto_dvb_tot, tvb, offset, -1, ENC_NA);
  48     dvb_tot_tree = proto_item_add_subtree(ti, ett_dvb_tot);
  49
  50     offset += packet_mpeg_sect_header(tvb, offset, dvb_tot_tree, NULL, NULL);
  51
  52     if (packet_mpeg_sect_mjd_to_utc_time(tvb, offset, &utc_time) < 0) {
  53         proto_tree_add_time_format_value(dvb_tot_tree, hf_dvb_tot_utc_time, tvb, offset, 5, &utc_time, "Unparseable time");
  54     } else {
  55         proto_tree_add_time(dvb_tot_tree, hf_dvb_tot_utc_time, tvb, offset, 5, &utc_time);
  56     }
  57
  58     offset += 5;
  59
  60     descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK;
  61     proto_tree_add_item(dvb_tot_tree, hf_dvb_tot_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
  62     proto_tree_add_item(dvb_tot_tree, hf_dvb_tot_descriptors_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
  63     offset += 2;
  64
  65     offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_tot_tree);
  66
  67     offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_tot_tree, 0, offset);
  68     proto_item_set_len(ti, offset);
  69     return tvb_captured_length(tvb);
  70 }
  71
  72
  73 void
  74 proto_register_dvb_tot(void)
  75 {
  76
  77     static hf_register_info hf[] = {
  78
  79         { &hf_dvb_tot_utc_time, {
  80             "UTC Time", "dvb_tot.utc_time",
  81             FT_ABSOLUTE_TIME, ABSOLUTE_TIME_UTC, NULL, 0, NULL, HFILL
  82         } },
  83
  84         { &hf_dvb_tot_reserved, {
  85             "Reserved", "dvb_tot.reserved",
  86             FT_UINT16, BASE_HEX, NULL, DVB_TOT_RESERVED_MASK, NULL, HFILL
  87         } },
  88
  89         { &hf_dvb_tot_descriptors_loop_length, {
  90              "Descriptors Loop Length", "dvb_tot.descr_loop_len",
  91              FT_UINT16, BASE_DEC, NULL, DVB_TOT_DESCRIPTORS_LOOP_LENGTH_MASK, NULL, HFILL
  92         } }
  93     };
  94
  95     static int *ett[] = {
  96         &ett_dvb_tot
  97     };
  98
  99     proto_dvb_tot = proto_register_protocol("DVB Time Offset Table", "DVB TOT", "dvb_tot");
 100
 101     proto_register_field_array(proto_dvb_tot, hf, array_length(hf));
 102     proto_register_subtree_array(ett, array_length(ett));
 103
 104     dvb_tot_handle = register_dissector("dvb_tot", dissect_dvb_tot, proto_dvb_tot);
 105 }
 106
 107
 108 void proto_reg_handoff_dvb_tot(void)
 109 {
 110     dissector_add_uint("mpeg_sect.tid", DVB_TOT_TID, dvb_tot_handle);
 111 }
 112
 113 /*
 114  * Editor modelines  -  https://www.wireshark.org/tools/modelines.html
 115  *
 116  * Local variables:
 117  * c-basic-offset: 4
 118  * tab-width: 8
 119  * indent-tabs-mode: nil
 120  * End:
 121  *
 122  * vi: set shiftwidth=4 tabstop=8 expandtab:
 123  * :indentSize=4:tabSize=8:noTabs=true:
 124  */