Release 4.7 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>

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

/**
 * crc32_le_combine - Combine two crc32 check values into one. For two
 *                    sequences of bytes, seq1 and seq2 with lengths len1
 *                    and len2, crc32_le() check values were calculated
 *                    for each, crc1 and crc2.
 *
 * @crc1: crc32 of the first block
 * @crc2: crc32 of the second block
 * @len2: length of the second block
 *
 * Return: The crc32_le() check value of seq1 and seq2 concatenated,
 *         requiring only crc1, crc2, and len2. Note: If seq_full denotes
 *         the concatenated memory area of seq1 with seq2, and crc_full
 *         the crc32_le() value of seq_full, then crc_full ==
 *         crc32_le_combine(crc1, crc2, len2) when crc_full was seeded
 *         with the same initializer as crc1, and crc2 seed was 0. See
 *         also crc32_combine_test().
 */
u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len);



static inline u32 crc32_le_combine(u32 crc1, u32 crc2, size_t len2)
{
	return crc32_le_shift(crc1, len2) ^ crc2;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
george spelvin
george spelvin
14
53.85%
1
50.00%
daniel borkmann
daniel borkmann
12
46.15%
1
50.00%
Total
26
100.00%
2
100.00%

u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len);

/**
 * __crc32c_le_combine - Combine two crc32c check values into one. For two
 *                       sequences of bytes, seq1 and seq2 with lengths len1
 *                       and len2, __crc32c_le() check values were calculated
 *                       for each, crc1 and crc2.
 *
 * @crc1: crc32c of the first block
 * @crc2: crc32c of the second block
 * @len2: length of the second block
 *
 * Return: The __crc32c_le() check value of seq1 and seq2 concatenated,
 *         requiring only crc1, crc2, and len2. Note: If seq_full denotes
 *         the concatenated memory area of seq1 with seq2, and crc_full
 *         the __crc32c_le() value of seq_full, then crc_full ==
 *         __crc32c_le_combine(crc1, crc2, len2) when crc_full was
 *         seeded with the same initializer as crc1, and crc2 seed
 *         was 0. See also crc32c_combine_test().
 */
u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len);



static inline u32 __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2)
{
	return __crc32c_le_shift(crc1, len2) ^ crc2;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
george spelvin
george spelvin
14
53.85%
1
50.00%
daniel borkmann
daniel borkmann
12
46.15%
1
50.00%
Total
26
100.00%
2
100.00%


#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 */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
69
39.88%
1
12.50%
george spelvin
george spelvin
53
30.64%
2
25.00%
daniel borkmann
daniel borkmann
26
15.03%
1
12.50%
darrick j. wong
darrick j. wong
16
9.25%
1
12.50%
akinobu mita
akinobu mita
4
2.31%
1
12.50%
jeff garzik
jeff garzik
4
2.31%
1
12.50%
konstantin khlebnikov
konstantin khlebnikov
1
0.58%
1
12.50%
Total
173
100.00%
8
100.00%
  
Directory: include/linux

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.