/* packet-mpeg-sdt.c
 * Routines for DVB (ETSI EN 300 468) Servide Description Table (SDT) 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 "packet-mpeg-sect.h"
#include "packet-mpeg-descriptor.h"

void proto_register_dvb_sdt(void);
void proto_reg_handoff_dvb_sdt(void);

static dissector_handle_t dvb_sdt_handle;

static int proto_dvb_sdt;
static int hf_dvb_sdt_transport_stream_id;
static int hf_dvb_sdt_reserved1;
static int hf_dvb_sdt_version_number;
static int hf_dvb_sdt_current_next_indicator;
static int hf_dvb_sdt_section_number;
static int hf_dvb_sdt_last_section_number;

static int hf_dvb_sdt_original_network_id;
static int hf_dvb_sdt_reserved2;

static int hf_dvb_sdt_service_id;
static int hf_dvb_sdt_reserved3;
static int hf_dvb_sdt_eit_schedule_flag;
static int hf_dvb_sdt_eit_present_following_flag;
static int hf_dvb_sdt_running_status;
static int hf_dvb_sdt_free_ca_mode;
static int hf_dvb_sdt_descriptors_loop_length;

static int ett_dvb_sdt;
static int ett_dvb_sdt_service;

#define DVB_SDT_RESERVED1_MASK                  0xC0
#define DVB_SDT_VERSION_NUMBER_MASK             0x3E
#define DVB_SDT_CURRENT_NEXT_INDICATOR_MASK     0x01

#define DVB_SDT_RESERVED3_MASK                  0xFC
#define DVB_SDT_EIT_SCHEDULE_FLAG_MASK          0x02
#define DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK 0x01

#define DVB_SDT_RUNNING_STATUS_MASK             0xE000
#define DVB_SDT_FREE_CA_MODE_MASK               0x1000
#define DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK    0x0FFF

static const value_string dvb_sdt_running_status_vals[] = {
    { 0, "Undefined" },
    { 1, "Not Running" },
    { 2, "Starts in a few seconds" },
    { 3, "Pausing" },
    { 4, "Running" },
    { 5, "Service off-air" },

    { 0, NULL }
};

static const value_string dvb_sdt_free_ca_mode_vals[] = {
    { 0, "Not Scrambled" },
    { 1, "One or more component scrambled" },

    { 0, NULL }
};

static int
dissect_dvb_sdt(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{

    unsigned    offset = 0, length = 0;
    unsigned    descriptor_len;
    uint16_t    svc_id;

    proto_item *ti;
    proto_tree *dvb_sdt_tree;
    proto_tree *dvb_sdt_service_tree;

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

    col_set_str(pinfo->cinfo, COL_INFO, "Service Description Table (SDT)");

    ti = proto_tree_add_item(tree, proto_dvb_sdt, tvb, offset, -1, ENC_NA);
    dvb_sdt_tree = proto_item_add_subtree(ti, ett_dvb_sdt);

    offset += packet_mpeg_sect_header(tvb, offset, dvb_sdt_tree, &length, NULL);
    length -= 4;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_transport_stream_id,    tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved1,              tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_version_number,         tvb, offset, 1, ENC_BIG_ENDIAN);
    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_section_number,         tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_last_section_number,    tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_original_network_id,    tvb, offset, 2, ENC_BIG_ENDIAN);
    offset += 2;

    proto_tree_add_item(dvb_sdt_tree, hf_dvb_sdt_reserved2,              tvb, offset, 1, ENC_BIG_ENDIAN);
    offset += 1;


    if (offset >= length)
        return offset;

    /* Parse all the services */
    while (offset < length) {

        svc_id = tvb_get_ntohs(tvb, offset);
        dvb_sdt_service_tree = proto_tree_add_subtree_format(dvb_sdt_tree, tvb, offset, 5,
                    ett_dvb_sdt_service, NULL, "Service 0x%04hx", svc_id);

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_service_id,                 tvb, offset, 2, ENC_BIG_ENDIAN);
        offset += 2;

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_reserved3,                  tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_schedule_flag,          tvb, offset, 1, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_eit_present_following_flag, tvb, offset, 1, ENC_BIG_ENDIAN);
        offset += 1;

        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_running_status,             tvb, offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_free_ca_mode,               tvb, offset, 2, ENC_BIG_ENDIAN);
        proto_tree_add_item(dvb_sdt_service_tree, hf_dvb_sdt_descriptors_loop_length,    tvb, offset, 2, ENC_BIG_ENDIAN);
        descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK;
        offset += 2;

        offset += proto_mpeg_descriptor_loop_dissect(tvb, offset, descriptor_len, dvb_sdt_service_tree);
    }

    offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_sdt_tree, 0, offset);
    proto_item_set_len(ti, offset);
    return tvb_captured_length(tvb);
}


void
proto_register_dvb_sdt(void)
{

    static hf_register_info hf[] = {

        { &hf_dvb_sdt_transport_stream_id, {
            "Transport Stream ID", "dvb_sdt.tsid",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved1, {
            "Reserved", "dvb_sdt.reserved1",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED1_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_version_number, {
            "Version Number", "dvb_sdt.version",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_VERSION_NUMBER_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_current_next_indicator, {
            "Current/Next Indicator", "dvb_sdt.cur_next_ind",
            FT_BOOLEAN, 8, TFS(&tfs_current_not_yet), DVB_SDT_CURRENT_NEXT_INDICATOR_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_section_number, {
            "Section Number", "dvb_sdt.sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_last_section_number, {
            "Last Section Number", "dvb_sdt.last_sect_num",
            FT_UINT8, BASE_DEC, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_original_network_id, {
            "Original Network ID", "dvb_sdt.original_nid",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved2, {
            "Reserved", "dvb_sdt.reserved2",
            FT_UINT8, BASE_HEX, NULL, 0, NULL, HFILL
        } },


        { &hf_dvb_sdt_service_id, {
            "Service ID", "dvb_sdt.svc.id",
            FT_UINT16, BASE_HEX, NULL, 0, NULL, HFILL
        } },

        { &hf_dvb_sdt_reserved3, {
            "Reserved", "dvb_sdt.svc.reserved",
            FT_UINT8, BASE_HEX, NULL, DVB_SDT_RESERVED3_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_eit_schedule_flag, {
            "EIT Schedule Flag", "dvb_sdt.svc.eit_schedule_flag",
            FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_SCHEDULE_FLAG_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_eit_present_following_flag, {
            "EIT Present Following Flag", "dvb_sdt.svc.eit_present_following_flag",
            FT_UINT8, BASE_DEC, NULL, DVB_SDT_EIT_PRESENT_FOLLOWING_FLAG_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_running_status, {
            "Running Status", "dvb_sdt.svc.running_status",
            FT_UINT16, BASE_HEX, VALS(dvb_sdt_running_status_vals), DVB_SDT_RUNNING_STATUS_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_free_ca_mode, {
            "Free CA Mode", "dvb_sdt.svc.free_ca_mode",
            FT_UINT16, BASE_HEX, VALS(dvb_sdt_free_ca_mode_vals), DVB_SDT_FREE_CA_MODE_MASK, NULL, HFILL
        } },

        { &hf_dvb_sdt_descriptors_loop_length, {
            "Descriptors Loop Length", "dvb_sdt.svc.descr_loop_len",
            FT_UINT16, BASE_DEC, NULL, DVB_SDT_DESCRIPTORS_LOOP_LENGTH_MASK, NULL, HFILL
        } }

    };

    static int *ett[] = {
        &ett_dvb_sdt,
        &ett_dvb_sdt_service
    };

    proto_dvb_sdt = proto_register_protocol("DVB Service Description Table", "DVB SDT", "dvb_sdt");

    proto_register_field_array(proto_dvb_sdt, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    dvb_sdt_handle = register_dissector("dvb_sdt", dissect_dvb_sdt, proto_dvb_sdt);
}


void proto_reg_handoff_dvb_sdt(void)
{
    dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_ACTUAL, dvb_sdt_handle);
    dissector_add_uint("mpeg_sect.tid", DVB_SDT_TID_OTHER, dvb_sdt_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:
 */