Linux kernel mirror (for testing)
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linux
1/*
2 * crc32.h
3 * See linux/lib/crc32.c for license and changes
4 */
5#ifndef _LINUX_CRC32_H
6#define _LINUX_CRC32_H
7
8#include <linux/types.h>
9#include <linux/bitrev.h>
10
11extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
12extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len);
13
14extern u32 __crc32c_le(u32 crc, unsigned char const *p, size_t len);
15
16#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length)
17
18/*
19 * Helpers for hash table generation of ethernet nics:
20 *
21 * Ethernet sends the least significant bit of a byte first, thus crc32_le
22 * is used. The output of crc32_le is bit reversed [most significant bit
23 * is in bit nr 0], thus it must be reversed before use. Except for
24 * nics that bit swap the result internally...
25 */
26#define ether_crc(length, data) bitrev32(crc32_le(~0, data, length))
27#define ether_crc_le(length, data) crc32_le(~0, data, length)
28
29#endif /* _LINUX_CRC32_H */