80 lines
2.8 KiB
C
80 lines
2.8 KiB
C
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/*
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* crc32.h
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* See linux/lib/crc32.c for license and changes
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*/
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#ifndef _LINUX_CRC32_H
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#define _LINUX_CRC32_H
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#include <linux/types.h>
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#include <linux/bitrev.h>
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u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len);
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u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len);
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/**
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* crc32_le_combine - Combine two crc32 check values into one. For two
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* sequences of bytes, seq1 and seq2 with lengths len1
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* and len2, crc32_le() check values were calculated
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* for each, crc1 and crc2.
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*
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* @crc1: crc32 of the first block
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* @crc2: crc32 of the second block
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* @len2: length of the second block
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*
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* Return: The crc32_le() check value of seq1 and seq2 concatenated,
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* requiring only crc1, crc2, and len2. Note: If seq_full denotes
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* the concatenated memory area of seq1 with seq2, and crc_full
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* the crc32_le() value of seq_full, then crc_full ==
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* crc32_le_combine(crc1, crc2, len2) when crc_full was seeded
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* with the same initializer as crc1, and crc2 seed was 0. See
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* also crc32_combine_test().
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*/
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u32 __attribute_const__ crc32_le_shift(u32 crc, size_t len);
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static inline u32 crc32_le_combine(u32 crc1, u32 crc2, size_t len2)
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{
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return crc32_le_shift(crc1, len2) ^ crc2;
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}
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u32 __pure __crc32c_le(u32 crc, unsigned char const *p, size_t len);
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/**
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* __crc32c_le_combine - Combine two crc32c check values into one. For two
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* sequences of bytes, seq1 and seq2 with lengths len1
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* and len2, __crc32c_le() check values were calculated
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* for each, crc1 and crc2.
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*
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* @crc1: crc32c of the first block
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* @crc2: crc32c of the second block
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* @len2: length of the second block
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*
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* Return: The __crc32c_le() check value of seq1 and seq2 concatenated,
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* requiring only crc1, crc2, and len2. Note: If seq_full denotes
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* the concatenated memory area of seq1 with seq2, and crc_full
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* the __crc32c_le() value of seq_full, then crc_full ==
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* __crc32c_le_combine(crc1, crc2, len2) when crc_full was
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* seeded with the same initializer as crc1, and crc2 seed
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* was 0. See also crc32c_combine_test().
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*/
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u32 __attribute_const__ __crc32c_le_shift(u32 crc, size_t len);
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static inline u32 __crc32c_le_combine(u32 crc1, u32 crc2, size_t len2)
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{
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return __crc32c_le_shift(crc1, len2) ^ crc2;
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}
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#define crc32(seed, data, length) crc32_le(seed, (unsigned char const *)(data), length)
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/*
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* Helpers for hash table generation of ethernet nics:
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*
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* Ethernet sends the least significant bit of a byte first, thus crc32_le
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* is used. The output of crc32_le is bit reversed [most significant bit
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* is in bit nr 0], thus it must be reversed before use. Except for
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* nics that bit swap the result internally...
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*/
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#define ether_crc(length, data) bitrev32(crc32_le(~0, data, length))
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#define ether_crc_le(length, data) crc32_le(~0, data, length)
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#endif /* _LINUX_CRC32_H */
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