crc32.h

 1/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
 2/* Copyright (C) 2015-2017 Netronome Systems, Inc. */
 3
 4#ifndef NFP_CRC32_H
 5#define NFP_CRC32_H
 6
 7#include <linux/crc32.h>
 8
 9/**
10 * crc32_posix_end() - Finalize POSIX CRC32 working state
11 * @crc:	Current CRC32 working state
12 * @total_len:	Total length of data that was CRC32'd
13 *
14 * Return: Final POSIX CRC32 value
15 */
16static inline u32 crc32_posix_end(u32 crc, size_t total_len)
17{
18	/* Extend with the length of the string. */
19	while (total_len != 0) {
20		u8 c = total_len & 0xff;
21
22		crc = crc32_be(crc, &c, 1);
23		total_len >>= 8;
24	}
25
26	return ~crc;
27}
28
29static inline u32 crc32_posix(const void *buff, size_t len)
30{
31	return crc32_posix_end(crc32_be(0, buff, len), len);
32}
33
34#endif /* NFP_CRC32_H */