[linux.git] / include / linux / crc32.h

/*
 * crc32.h
 * See linux/lib/crc32.c for license and changes
 */
#ifndef _LINUX_CRC32_H
#define _LINUX_CRC32_H

#include <linux/types.h>
#include <linux/bitrev.h>

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...
 */
#define ether_crc(length, data)    bitrev32(crc32_le(~0, data, length))
#define ether_crc_le(length, data) crc32_le(~0, data, length)

#endif /* _LINUX_CRC32_H */
Commit	Line	Data
1da177e4 LT	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>
906d66df	9	#include <linux/bitrev.h>
1da177e4 LT	10
	11	extern u32 crc32_le(u32 crc, unsigned char const *p, size_t len);
	12	extern u32 crc32_be(u32 crc, unsigned char const *p, size_t len);
1da177e4	13
d03e1617	14	#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length)
1da177e4 LT	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	*/
906d66df	24	#define ether_crc(length, data) bitrev32(crc32_le(~0, data, length))
1da177e4 LT	25	#define ether_crc_le(length, data) crc32_le(~0, data, length)
	26
	27	#endif /* _LINUX_CRC32_H */