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/*
* CRC functions for mpeg PSI tables
* Copyright (C) 2010-2011 Unix Solutions Ltd.
*
* Released under MIT license.
* See LICENSE-MIT.txt for license terms.
*/
#include <netdb.h>
#include "tsfuncs.h"
#define CRC32_POLY 0x04C11DB7L
static int crc_table_initialized = 0;
static uint32_t crc32_table[256];
void ts_crc32_init(void) {
int i, j;
uint32_t crc;
if (crc_table_initialized)
return;
crc_table_initialized = 1;
for (i=0; i<256; i++) {
crc = i << 24;
for (j=0; j<8; j++) {
if (crc & 0x80000000L)
crc = (crc << 1) ^ CRC32_POLY;
else
crc = (crc << 1);
}
crc32_table[i] = crc;
}
crc_table_initialized = 1;
}
uint32_t ts_crc32(uint8_t *data, int data_size) {
int i, j;
uint32_t crc = 0xffffffff;
if (!crc_table_initialized) {
ts_crc32_init();
}
for (j=0; j<data_size; j++) {
i = ((crc >> 24) ^ *data++) & 0xff;
crc = (crc << 8) ^ crc32_table[i];
}
return crc;
}
u_int32_t ts_crc32_section(struct ts_section_header *section_header) {
return ts_crc32(section_header->section_data, section_header->section_data_len);
}
int ts_crc32_section_check(struct ts_section_header *section_header, char *table) {
uint32_t check_crc = ts_crc32(section_header->section_data, section_header->section_data_len);
if (check_crc != 0) {
ts_LOGf("!!! Wrong %s table CRC! It should be 0 but it is 0x%08x (CRC in data is 0x%08x)\n",
table,
check_crc,
section_header->CRC);
return 0;
}
return 1;
}
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