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- /*
- * CAT table parser and generator
- * Copyright (C) 2010-2011 Unix Solutions Ltd.
- *
- * Released under MIT license.
- * See LICENSE-MIT.txt for license terms.
- */
- #include <stdio.h>
- #include <unistd.h>
- #include <netdb.h>
- #include <stdlib.h>
- #include <string.h>
-
- #include "tsfuncs.h"
-
- struct ts_cat *ts_cat_alloc() {
- struct ts_cat *cat = calloc(1, sizeof(struct ts_cat));
- cat->section_header = ts_section_data_alloc();
- return cat;
- }
-
- void ts_cat_clear(struct ts_cat *cat) {
- if (!cat)
- return;
- // save
- struct ts_section_header *section_header = cat->section_header;
- // free
- FREE(cat->program_info);
- // clear
- ts_section_data_clear(section_header);
- memset(cat, 0, sizeof(struct ts_cat));
- // restore
- cat->section_header = section_header;
- }
-
- void ts_cat_free(struct ts_cat **pcat) {
- struct ts_cat *cat = *pcat;
- if (cat) {
- ts_section_data_free(&cat->section_header);
- FREE(cat->program_info);
- FREE(*pcat);
- }
- }
-
- struct ts_cat *ts_cat_push_packet(struct ts_cat *cat, uint8_t *ts_packet) {
- struct ts_header ts_header;
- memset(&ts_header, 0, sizeof(struct ts_header));
-
- if (ts_packet_header_parse(ts_packet, &ts_header)) {
- // Received PUSI packet before table END, clear the table to start gathering new one
- if (ts_header.pusi && cat->ts_header.pusi)
- ts_cat_clear(cat);
- if (!cat->ts_header.pusi)
- cat->ts_header = ts_header;
- }
-
- if (ts_header.pusi) {
- struct ts_section_header section_header;
- memset(§ion_header, 0, sizeof(struct ts_section_header));
-
- uint8_t *section_data = ts_section_header_parse(ts_packet, &cat->ts_header, §ion_header);
- if (!section_data) {
- memset(&cat->ts_header, 0, sizeof(struct ts_header));
- goto OUT;
- }
- // table_id should be 0x01 (ca_map_section)
- if (section_header.table_id != 0x01) {
- memset(&cat->ts_header, 0, sizeof(struct ts_header));
- goto OUT;
- }
-
- // Set correct section_header
- ts_section_header_parse(ts_packet, &cat->ts_header, cat->section_header);
- }
-
- if (!cat->initialized) {
- ts_section_add_packet(cat->section_header, &ts_header, ts_packet);
- if (cat->section_header->initialized) {
- if (!ts_cat_parse(cat))
- goto ERROR;
- }
- }
-
- OUT:
- return cat;
-
- ERROR:
- ts_cat_clear(cat);
- return cat;
- }
-
- int ts_cat_parse(struct ts_cat *cat) {
- uint8_t *section_data = cat->section_header->data;
- int section_len = cat->section_header->data_len;
-
- if (section_len > 4096)
- return 0;
- /* Handle streams */
- uint8_t *stream_data = section_data;
- cat->program_info_size = section_len;
- cat->program_info = malloc(cat->program_info_size);
- if (!cat->program_info)
- return 0;
- memcpy(cat->program_info, stream_data, cat->program_info_size);
- stream_data += cat->program_info_size;
-
- if (!ts_crc32_section_check(cat->section_header, "CAT"))
- return 0;
-
- cat->initialized = 1;
- return 1;
- }
-
- void ts_cat_generate(struct ts_cat *cat, uint8_t **ts_packets, int *num_packets) {
- uint8_t *secdata = ts_section_data_alloc_section();
- ts_section_header_generate(secdata, cat->section_header, 0);
- int curpos = 8; // Compensate for the section header, frist data byte is at offset 8
-
- memcpy(secdata + curpos, cat->program_info, cat->program_info_size);
- curpos += cat->program_info_size;
-
- cat->section_header->CRC = ts_section_data_calculate_crc(secdata, curpos);
- curpos += 4; // CRC
-
- ts_section_data_gen_ts_packets(&cat->ts_header, secdata, curpos, cat->section_header->pointer_field, ts_packets, num_packets);
-
- FREE(secdata);
- }
-
- void ts_cat_regenerate_packets(struct ts_cat *cat) {
- uint8_t *ts_packets;
- int num_packets;
- ts_cat_generate(cat, &ts_packets, &num_packets);
- FREE(cat->section_header->packet_data);
- cat->section_header->packet_data = ts_packets;
- cat->section_header->num_packets = num_packets;
- }
-
- struct ts_cat *ts_cat_copy(struct ts_cat *cat) {
- struct ts_cat *newcat = ts_cat_alloc();
- int i;
- for (i=0;i<cat->section_header->num_packets; i++) {
- newcat = ts_cat_push_packet(newcat, cat->section_header->packet_data + (i * TS_PACKET_SIZE));
- }
- if (newcat->initialized) {
- return newcat;
- } else {
- ts_LOGf("Error copying cat!\n");
- ts_cat_free(&newcat);
- return NULL;
- }
- }
-
- void ts_cat_check_generator(struct ts_cat *cat) {
- struct ts_cat *cat1 = ts_cat_copy(cat);
- if (cat1) {
- ts_compare_data("CAT (tspacket->struct)",
- cat1->section_header->packet_data,
- cat->section_header->packet_data,
- cat->section_header->num_packets * TS_PACKET_SIZE);
- ts_cat_free(&cat1);
- }
-
- uint8_t *ts_packets;
- int num_packets;
- ts_cat_generate(cat, &ts_packets, &num_packets);
- if (num_packets != cat->section_header->num_packets) {
- ts_LOGf("ERROR: num_packets:%d != sec->num_packets:%d\n", num_packets, cat->section_header->num_packets);
- }
- ts_compare_data("CAT (struct->tspacket)", cat->section_header->packet_data, ts_packets, num_packets * TS_PACKET_SIZE);
- free(ts_packets);
- }
-
- void ts_cat_dump(struct ts_cat *cat) {
- struct ts_section_header *sec = cat->section_header;
-
- ts_section_dump(sec);
-
- if (cat->program_info_size > 0) {
- ts_LOGf(" * Descriptor dump:\n");
- ts_descriptor_dump(cat->program_info, cat->program_info_size);
- }
-
- ts_cat_check_generator(cat);
- }
-
- int ts_cat_is_same(struct ts_cat *cat1, struct ts_cat *cat2) {
- if (cat1 == cat2) return 1; // Same
- if ((!cat1 && cat2) || (cat1 && !cat2)) return 0; // Not same (one is NULL)
- return ts_section_is_same(cat1->section_header, cat2->section_header);
- }
-
- enum CA_system ts_get_CA_sys(uint16_t CA_id) {
- if (CA_id >= 0x0100 && CA_id <= 0x01FF) return CA_SECA;
- if (CA_id >= 0x0500 && CA_id <= 0x05FF) return CA_VIACCESS;
- if (CA_id >= 0x0600 && CA_id <= 0x06FF) return CA_IRDETO;
- if (CA_id >= 0x0900 && CA_id <= 0x09FF) return CA_VIDEOGUARD;
- if (CA_id >= 0x0B00 && CA_id <= 0x0BFF) return CA_CONAX;
- if (CA_id >= 0x0D00 && CA_id <= 0x0DFF) return CA_CRYPTOWORKS;
- if (CA_id >= 0x1800 && CA_id <= 0x18FF) return CA_NAGRA;
- switch (CA_id) {
- case 0x4ABF: return CA_DGCRYPT;
-
- case 0x4AE0: return CA_DRECRYPT;
- case 0x4AE1: return CA_DRECRYPT;
-
- case 0x5581: return CA_BULCRYPT;
- case 0x4AEE: return CA_BULCRYPT;
-
- case 0x5501: return CA_GRIFFIN;
- case 0x5504: return CA_GRIFFIN;
- case 0x5506: return CA_GRIFFIN;
- case 0x5508: return CA_GRIFFIN;
- case 0x5509: return CA_GRIFFIN;
- case 0x550E: return CA_GRIFFIN;
- case 0x5511: return CA_GRIFFIN;
- }
- return CA_UNKNOWN;
- }
-
- char * ts_get_CA_sys_txt(enum CA_system CA_sys) {
- switch (CA_sys) {
- case CA_SECA: return "SECA";
- case CA_VIACCESS: return "VIACCESS";
- case CA_IRDETO: return "IRDETO";
- case CA_VIDEOGUARD: return "VIDEOGUARD";
- case CA_CONAX: return "CONAX";
- case CA_CRYPTOWORKS: return "CRYPTOWORKS";
- case CA_NAGRA: return "NAGRA";
- case CA_DRECRYPT: return "DRE-CRYPT";
- case CA_BULCRYPT: return "BULCRYPT";
- case CA_GRIFFIN: return "GRIFFIN";
- case CA_DGCRYPT: return "DGCRYPT";
- case CA_UNKNOWN: return "UNKNOWN";
- }
- return "UNKNOWN";
- }
-
- static int find_CA_descriptor(uint8_t *data, int data_len, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
- while (data_len >= 2) {
- uint8_t tag = data[0];
- uint8_t this_length = data[1];
- data += 2;
- data_len -= 2;
- if (tag == 9 && this_length >= 4) {
- uint16_t CA_ID = (data[0] << 8) | data[1];
- uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
- if (ts_get_CA_sys(CA_ID) == req_CA_type) {
- *CA_id = CA_ID;
- *CA_pid = CA_PID;
- return 1;
- }
- }
- data_len -= this_length;
- data += this_length;
- }
- return 0;
- }
-
- int ts_get_emm_info(struct ts_cat *cat, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
- return find_CA_descriptor(cat->program_info, cat->program_info_size, req_CA_type, CA_id, CA_pid);
- }
-
- int ts_get_ecm_info(struct ts_pmt *pmt, enum CA_system req_CA_type, uint16_t *CA_id, uint16_t *CA_pid) {
- int i, result = find_CA_descriptor(pmt->program_info, pmt->program_info_size, req_CA_type, CA_id, CA_pid);
- if (!result) {
- for(i=0;i<pmt->streams_num;i++) {
- struct ts_pmt_stream *stream = pmt->streams[i];
- if (stream->ES_info) {
- result = find_CA_descriptor(stream->ES_info, stream->ES_info_size, req_CA_type, CA_id, CA_pid);
- if (result)
- break;
- }
- }
- }
-
- return result;
- }
-
- static int find_CA_descriptor_by_caid(uint8_t *data, int data_len, uint16_t caid, uint16_t *CA_pid) {
- while (data_len >= 2) {
- uint8_t tag = data[0];
- uint8_t this_length = data[1];
- data += 2;
- data_len -= 2;
- if (tag == 9 && this_length >= 4) {
- uint16_t CA_ID = (data[0] << 8) | data[1];
- uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
- if (CA_ID == caid) {
- *CA_pid = CA_PID;
- return 1;
- }
- }
- data_len -= this_length;
- data += this_length;
- }
- return 0;
- }
-
- int ts_get_emm_info_by_caid(struct ts_cat *cat, uint16_t caid, uint16_t *ca_pid) {
- return find_CA_descriptor_by_caid(cat->program_info, cat->program_info_size, caid, ca_pid);
- }
-
- int ts_get_ecm_info_by_caid(struct ts_pmt *pmt, uint16_t caid, uint16_t *ca_pid) {
- int i, result = find_CA_descriptor_by_caid(pmt->program_info, pmt->program_info_size, caid, ca_pid);
- if (!result) {
- for(i=0;i<pmt->streams_num;i++) {
- struct ts_pmt_stream *stream = pmt->streams[i];
- if (stream->ES_info) {
- result = find_CA_descriptor_by_caid(stream->ES_info, stream->ES_info_size, caid, ca_pid);
- if (result)
- break;
- }
- }
- }
-
- return result;
- }
-
-
- static int find_CA_descriptor_by_pid(uint8_t *data, int data_len, uint16_t *caid, uint16_t pid) {
- while (data_len >= 2) {
- uint8_t tag = data[0];
- uint8_t this_length = data[1];
- data += 2;
- data_len -= 2;
- if (tag == 9 && this_length >= 4) {
- uint16_t CA_ID = (data[0] << 8) | data[1];
- uint16_t CA_PID = ((data[2] & 0x1F) << 8) | data[3];
- if (CA_PID == pid) {
- *caid = CA_ID;
- return 1;
- }
- }
- data_len -= this_length;
- data += this_length;
- }
- return 0;
- }
-
- int ts_get_emm_info_by_pid(struct ts_cat *cat, uint16_t *caid, uint16_t ca_pid) {
- return find_CA_descriptor_by_pid(cat->program_info, cat->program_info_size, caid, ca_pid);
- }
-
- int ts_get_ecm_info_by_pid(struct ts_pmt *pmt, uint16_t *caid, uint16_t ca_pid) {
- int i, result = find_CA_descriptor_by_pid(pmt->program_info, pmt->program_info_size, caid, ca_pid);
- if (!result) {
- for(i=0;i<pmt->streams_num;i++) {
- struct ts_pmt_stream *stream = pmt->streams[i];
- if (stream->ES_info) {
- result = find_CA_descriptor_by_pid(stream->ES_info, stream->ES_info_size, caid, ca_pid);
- if (result)
- break;
- }
- }
- }
-
- return result;
- }
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