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/* packet-mpeg-pat.c
* Routines for MPEG2 (ISO/ISO 13818-1) Program Associate Table (PAT) dissection
* Copyright 2012, Guy Martin <gmsoft@tuxicoman.be>
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include "packet-mpeg-sect.h"
void proto_register_mpeg_pat(void);
void proto_reg_handoff_mpeg_pat(void);
static dissector_handle_t mpeg_pat_handle;
static int proto_mpeg_pat = -1;
static int hf_mpeg_pat_transport_stream_id = -1;
static int hf_mpeg_pat_reserved = -1;
static int hf_mpeg_pat_version_number = -1;
static int hf_mpeg_pat_current_next_indicator = -1;
static int hf_mpeg_pat_section_number = -1;
static int hf_mpeg_pat_last_section_number = -1;
static int hf_mpeg_pat_program_number = -1;
static int hf_mpeg_pat_program_reserved = -1;
static int hf_mpeg_pat_program_map_pid = -1;
static gint ett_mpeg_pat = -1;
static gint ett_mpeg_pat_prog = -1;
#define MPEG_PAT_RESERVED_MASK 0xC0
#define MPEG_PAT_VERSION_NUMBER_MASK 0x3E
#define MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK 0x01
#define MPEG_PAT_PROGRAM_RESERVED_MASK 0xE000
#define MPEG_PAT_PROGRAM_MAP_PID_MASK 0x1FFF
static int
dissect_mpeg_pat(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
guint offset = 0, length = 0;
guint16 prog_num, prog_pid;
proto_item *ti;
proto_tree *mpeg_pat_tree;
proto_tree *mpeg_pat_prog_tree;
/* The TVB should start right after the section_length in the Section packet */
col_set_str(pinfo->cinfo, COL_INFO, "Program Association Table (PAT)");
ti = proto_tree_add_item(tree, proto_mpeg_pat, tvb, offset, -1, ENC_NA);
mpeg_pat_tree = proto_item_add_subtree(ti, ett_mpeg_pat);
offset += packet_mpeg_sect_header(tvb, offset, mpeg_pat_tree, &length, NULL);
length -= 4;
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(mpeg_pat_tree, hf_mpeg_pat_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
/* Parse all the programs */
while (offset < length) {
prog_num = tvb_get_ntohs(tvb, offset);
prog_pid = tvb_get_ntohs(tvb, offset + 2) & MPEG_PAT_PROGRAM_MAP_PID_MASK;
mpeg_pat_prog_tree = proto_tree_add_subtree_format(mpeg_pat_tree, tvb, offset, 4,
ett_mpeg_pat_prog, NULL, "Program 0x%04hx -> PID 0x%04hx", prog_num, prog_pid);
proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_number, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_reserved, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(mpeg_pat_prog_tree, hf_mpeg_pat_program_map_pid, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
}
offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_pat_tree, 0, offset);
proto_item_set_len(ti, offset);
return tvb_captured_length(tvb);
}
void
proto_register_mpeg_pat(void)
{
static hf_register_info hf[] = {
{ &hf_mpeg_pat_transport_stream_id, {
"Transport Stream ID", "mpeg_pat.tsid",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pat_reserved, {
"Reserved", "mpeg_pat.reserved",
FT_UINT8, BASE_HEX, NULL, MPEG_PAT_RESERVED_MASK, NULL, HFILL
} },
{ &hf_mpeg_pat_version_number, {
"Version Number", "mpeg_pat.version",
FT_UINT8, BASE_HEX, NULL, MPEG_PAT_VERSION_NUMBER_MASK, NULL, HFILL
} },
{ &hf_mpeg_pat_current_next_indicator, {
"Current/Next Indicator", "mpeg_pat.cur_next_ind",
FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), MPEG_PAT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
} },
{ &hf_mpeg_pat_section_number, {
"Section Number", "mpeg_pat.sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pat_last_section_number, {
"Last Section Number", "mpeg_pat.last_sect_num",
FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pat_program_number, {
"Program Number", "mpeg_pat.prog_num",
FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
} },
{ &hf_mpeg_pat_program_reserved, {
"Reserved", "mpeg_pat.prog_reserved",
FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_RESERVED_MASK, NULL, HFILL
} },
{ &hf_mpeg_pat_program_map_pid, {
"Program Map PID", "mpeg_pat.prog_map_pid",
FT_UINT16, BASE_HEX, NULL, MPEG_PAT_PROGRAM_MAP_PID_MASK, NULL, HFILL
} },
};
static gint *ett[] = {
&ett_mpeg_pat,
&ett_mpeg_pat_prog
};
proto_mpeg_pat = proto_register_protocol("MPEG2 Program Association Table", "MPEG PAT", "mpeg_pat");
proto_register_field_array(proto_mpeg_pat, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
mpeg_pat_handle = register_dissector("mpeg_pat", dissect_mpeg_pat, proto_mpeg_pat);
}
void proto_reg_handoff_mpeg_pat(void)
{
dissector_add_uint("mpeg_sect.tid", MPEG_PAT_TID, mpeg_pat_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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