crc32.h 880 Bytes
Newer Older
Linus Torvalds's avatar
Linus Torvalds committed
1 2 3 4 5 6 7 8
/*
 * crc32.h
 * See linux/lib/crc32.c for license and changes
 */
#ifndef _LINUX_CRC32_H
#define _LINUX_CRC32_H

#include <linux/types.h>
9
#include <linux/bitrev.h>
Linus Torvalds's avatar
Linus Torvalds committed
10 11 12 13 14 15 16 17 18 19 20 21 22 23

extern u32  crc32_le(u32 crc, unsigned char const *p, size_t len);
extern u32  crc32_be(u32 crc, unsigned char const *p, size_t len);

#define crc32(seed, data, length)  crc32_le(seed, (unsigned char const *)data, length)

/*
 * Helpers for hash table generation of ethernet nics:
 *
 * Ethernet sends the least significant bit of a byte first, thus crc32_le
 * is used. The output of crc32_le is bit reversed [most significant bit
 * is in bit nr 0], thus it must be reversed before use. Except for
 * nics that bit swap the result internally...
 */
24
#define ether_crc(length, data)    bitrev32(crc32_le(~0, data, length))
Linus Torvalds's avatar
Linus Torvalds committed
25 26 27
#define ether_crc_le(length, data) crc32_le(~0, data, length)

#endif /* _LINUX_CRC32_H */