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79 lines
2.8 KiB
79 lines
2.8 KiB
/* |
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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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