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/include/linux/crc32.h

https://bitbucket.org/thekraven/iscream_thunderc-2.6.35
C++ Header | 27 lines | 10 code | 5 blank | 12 comment | 0 complexity | d23f168926b322ea266dc012f4c26d72 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
 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
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)    bitrev32(crc32_le(~0, data, length))
25#define ether_crc_le(length, data) crc32_le(~0, data, length)
26
27#endif /* _LINUX_CRC32_H */