calc_crc32
uint32_t calc_crc32(uint8_t *crc32_packet, uint32_t crc32_length,
return bswap32(calc_crc32((uint8_t *)packet_buf, 8, seed, 0));
static u_int32_t calc_crc32(u_int32_t, caddr_t, u_int);
*crc_p = calc_crc32(*crc_p, data_p, slice);
if (calc_crc32(crc, p, framelen) != CRC32_REMAINDER)