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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2018 Netronome Systems, Inc.
* All rights reserved.
*/
#include <stdio.h>
#include <inttypes.h>
#include "nfp_crc.h"
static inline uint32_t
nfp_crc32_be_generic(uint32_t crc, unsigned char const *p, size_t len,
uint32_t polynomial)
{
int i;
while (len--) {
crc ^= *p++ << 24;
for (i = 0; i < 8; i++)
crc = (crc << 1) ^ ((crc & 0x80000000) ? polynomial :
0);
}
return crc;
}
static inline uint32_t
nfp_crc32_be(uint32_t crc, unsigned char const *p, size_t len)
{
return nfp_crc32_be_generic(crc, p, len, CRCPOLY_BE);
}
static uint32_t
nfp_crc32_posix_end(uint32_t crc, size_t total_len)
{
/* Extend with the length of the string. */
while (total_len != 0) {
uint8_t c = total_len & 0xff;
crc = nfp_crc32_be(crc, &c, 1);
total_len >>= 8;
}
return ~crc;
}
uint32_t
nfp_crc32_posix(const void *buff, size_t len)
{
return nfp_crc32_posix_end(nfp_crc32_be(0, buff, len), len);
}
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