/* packet-mpeg-ca.c

 * Routines for MPEG2 (ISO/ISO 13818-1) Conditional Access Table (CA) 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 <epan/tfs.h>

#include <wsutil/array.h>

#include "packet-mpeg-sect.h"

#include "packet-mpeg-descriptor.h"

void proto_register_mpeg_ca(void);

void proto_reg_handoff_mpeg_ca(void);

static dissector_handle_t mpeg_ca_handle;

static int proto_mpeg_ca;

static int hf_mpeg_ca_reserved;

static int hf_mpeg_ca_version_number;

static int hf_mpeg_ca_current_next_indicator;

static int hf_mpeg_ca_section_number;

static int hf_mpeg_ca_last_section_number;

static int ett_mpeg_ca;

#define MPEG_CA_RESERVED_MASK                   0xFFFFC0

#define MPEG_CA_VERSION_NUMBER_MASK             0x00003E

#define MPEG_CA_CURRENT_NEXT_INDICATOR_MASK     0x000001

static int

dissect_mpeg_ca(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)

{

    unsigned offset = 0, length = 0;

    proto_item *ti;

    proto_tree *mpeg_ca_tree;

    /* The TVB should start right after the section_length in the Section packet */

    col_set_str(pinfo->cinfo, COL_INFO, "Conditional Access Table (CA)");

    ti = proto_tree_add_item(tree, proto_mpeg_ca, tvb, offset, -1, ENC_NA);

    mpeg_ca_tree = proto_item_add_subtree(ti, ett_mpeg_ca);

    offset += packet_mpeg_sect_header(tvb, offset, mpeg_ca_tree, &length, NULL);

    length -= 4;

    proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_reserved, tvb, offset, 3, ENC_BIG_ENDIAN);

    proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_version_number, tvb, offset, 3, ENC_BIG_ENDIAN);

    proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_current_next_indicator, tvb, offset, 3, ENC_BIG_ENDIAN);

    offset += 3;

    proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    proto_tree_add_item(mpeg_ca_tree, hf_mpeg_ca_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);

    offset += 1;

    /* Parse all the programs */

    while (offset < length)

        offset += proto_mpeg_descriptor_dissect(tvb, pinfo, offset, mpeg_ca_tree);

    offset += packet_mpeg_sect_crc(tvb, pinfo, mpeg_ca_tree, 0, offset);

    proto_item_set_len(ti, offset);

    return tvb_captured_length(tvb);

}

void

proto_register_mpeg_ca(void)

{

    static hf_register_info hf[] = {

        { &hf_mpeg_ca_reserved, {

            "Reserved", "mpeg_ca.reserved",

            FT_UINT24, BASE_HEX, NULL, MPEG_CA_RESERVED_MASK,

                        NULL, HFILL

        } },

        { &hf_mpeg_ca_version_number, {

            "Version Number", "mpeg_ca.version",

            FT_UINT24, BASE_HEX, NULL, MPEG_CA_VERSION_NUMBER_MASK,

                        NULL, HFILL

        } },

        { &hf_mpeg_ca_current_next_indicator, {

            "Current/Next Indicator", "mpeg_ca.cur_next_ind",

            FT_BOOLEAN, 24, TFS(&tfs_current_not_yet), MPEG_CA_CURRENT_NEXT_INDICATOR_MASK,

                        NULL, HFILL

        } },

        { &hf_mpeg_ca_section_number, {

            "Section Number", "mpeg_ca.sect_num",

            FT_UINT8, BASE_DEC, NULL, 0,

                        NULL, HFILL

        } },

        { &hf_mpeg_ca_last_section_number, {

            "Last Section Number", "mpeg_ca.last_sect_num",

            FT_UINT8, BASE_DEC, NULL, 0,

                        NULL, HFILL

        } },

    };

    static int *ett[] = {

        &ett_mpeg_ca,

    };

    proto_mpeg_ca = proto_register_protocol("MPEG2 Conditional Access Table", "MPEG CA", "mpeg_ca");

    proto_register_field_array(proto_mpeg_ca, hf, array_length(hf));

    proto_register_subtree_array(ett, array_length(ett));

    mpeg_ca_handle = register_dissector("mpeg_ca", dissect_mpeg_ca, proto_mpeg_ca);

}

void proto_reg_handoff_mpeg_ca(void)

{

    dissector_add_uint("mpeg_sect.tid", MPEG_CA_TID, mpeg_ca_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:

 */