2 * Routines for MPEG2 (ISO/ISO 13818-1) Conditional Access Table (CA) dissection
3 * Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <gerald@wireshark.org>
7 * Copyright 1998 Gerald Combs
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.
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. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License along
20 * with this program; if not, write to the Free Software Foundation, Inc.,
21 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 #include <epan/packet.h>
27 #include "packet-mpeg-sect.h"
28 #include "packet-mpeg-descriptor.h"
30 void proto_register_mpeg_ca(void);
31 void proto_reg_handoff_mpeg_ca(void);
33 static int proto_mpeg_ca = -1;
34 static int hf_mpeg_ca_reserved = -1;
35 static int hf_mpeg_ca_version_number = -1;
36 static int hf_mpeg_ca_current_next_indicator = -1;
37 static int hf_mpeg_ca_section_number = -1;
38 static int hf_mpeg_ca_last_section_number = -1;
40 static gint ett_mpeg_ca = -1;
42 #define MPEG_CA_RESERVED_MASK 0xFFFFC0
43 #define MPEG_CA_VERSION_NUMBER_MASK 0x00003E
44 #define MPEG_CA_CURRENT_NEXT_INDICATOR_MASK 0x000001
46 static const value_string mpeg_ca_cur_next_vals[] = {
48 { 0x0, "Not yet applicable" },
49 { 0x1, "Currently applicable" },
55 dissect_mpeg_ca(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
57 guint offset = 0, length = 0;
60 proto_tree *mpeg_ca_tree;
62 /* The TVB should start right after the section_length in the Section packet */
64 col_set_str(pinfo->cinfo, COL_INFO, "Conditional Access Table (CA)");
66 ti = proto_tree_add_item(tree, proto_mpeg_ca, tvb, offset, -1, ENC_NA);
67 mpeg_ca_tree = proto_item_add_subtree(ti, ett_mpeg_ca);
69 offset += packet_mpeg_sect_header(tvb, offset, mpeg_ca_tree, &length, NULL);
72 proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);
73 proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_version_number, tvb, offset, 3, ENC_BIG_ENDIAN);
74 proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_current_next_indicator, tvb, offset, 3, ENC_BIG_ENDIAN);
77 proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
80 proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
83 /* Parse all the programs */
84 while (offset < length)
85 offset += proto_mpeg_descriptor_dissect(tvb, offset, mpeg_ca_tree);
87 offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_ca_tree, 0, offset);
89 proto_item_set_len(ti, offset);
90 return tvb_captured_length(tvb);
95 proto_register_mpeg_ca(void)
98 static hf_register_info hf[] = {
100 { &hf_mpeg_ca_reserved, {
101 "Reserved", "mpeg_ca.reserved",
102 FT_UINT24, BASE_HEX, NULL, MPEG_CA_RESERVED_MASK,
106 { &hf_mpeg_ca_version_number, {
107 "Version Number", "mpeg_ca.version",
108 FT_UINT24, BASE_HEX, NULL, MPEG_CA_VERSION_NUMBER_MASK,
112 { &hf_mpeg_ca_current_next_indicator, {
113 "Current/Next Indicator", "mpeg_ca.cur_next_ind",
114 FT_UINT24, BASE_HEX, VALS(mpeg_ca_cur_next_vals), MPEG_CA_CURRENT_NEXT_INDICATOR_MASK,
118 { &hf_mpeg_ca_section_number, {
119 "Section Number", "mpeg_ca.sect_num",
120 FT_UINT8, BASE_DEC, NULL, 0,
124 { &hf_mpeg_ca_last_section_number, {
125 "Last Section Number", "mpeg_ca.last_sect_num",
126 FT_UINT8, BASE_DEC, NULL, 0,
132 static gint *ett[] = {
136 proto_mpeg_ca = proto_register_protocol("MPEG2 Conditional Access Table", "MPEG CA", "mpeg_ca");
138 proto_register_field_array(proto_mpeg_ca, hf, array_length(hf));
139 proto_register_subtree_array(ett, array_length(ett));
144 void proto_reg_handoff_mpeg_ca(void)
146 dissector_handle_t mpeg_ca_handle;
148 mpeg_ca_handle = new_create_dissector_handle(dissect_mpeg_ca, proto_mpeg_ca);
149 dissector_add_uint("mpeg_sect.tid", MPEG_CA_TID, mpeg_ca_handle);
153 * Editor modelines - http://www.wireshark.org/tools/modelines.html
158 * indent-tabs-mode: nil
161 * vi: set shiftwidth=4 tabstop=8 expandtab:
162 * :indentSize=4:tabSize=8:noTabs=true: