in source/crc_sw.c [1211:1214]
static uint32_t s_crc32_sb4(const uint8_t *input, int length, uint32_t previousCrc32) {
uint32_t crc = s_crc_generic_align(&input, &length, ~previousCrc32, &CRC32_TABLE[0][0]);
return ~s_crc_generic_sb4(input, length, crc, &CRC32_TABLE[0][0]);
}