idm_crc32c
crc_calculated = idm_crc32c(pdu->isp_data,
hdr_digest_crc = idm_crc32c(pdu->isp_hdr, pdu->isp_hdrlen);
data_digest_crc = idm_crc32c(pdu->isp_data,
crc_calculated = idm_crc32c(pdu->isp_hdr,
uint32_t idm_crc32c(void *address, unsigned long length);