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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
10extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
11extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len);
12extern u32 bitreverse(u32 in);
13
14#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)data, length)
15
16/*
17 * Helpers for hash table generation of ethernet nics:
18 *
19 * Ethernet sends the least significant bit of a byte first, thus crc32_le
20 * is used. The output of crc32_le is bit reversed [most significant bit
21 * is in bit nr 0], thus it must be reversed before use. Except for
22 * nics that bit swap the result internally...
23 */
24#define ether_crc(length, data) bitreverse(crc32_le(~0, data, length))
25#define ether_crc_le(length, data) crc32_le(~0, data, length)
26
27#endif /* _LINUX_CRC32_H */