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40 lines
670 B
C
40 lines
670 B
C
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#ifndef __crc32_h__
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#define __crc32_h__
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#include "compat.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern uint32_t crc32table[256];
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void initcrc32table(void);
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uint32_t crc32once(uint8_t *blk, uint32_t len);
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static inline void crc32init(uint32_t *crcvar)
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{
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if (!crcvar) return;
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*crcvar = 0xffffffffl;
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}
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static inline void crc32block(uint32_t *crcvar, uint8_t *blk, uint32_t len)
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{
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uint32_t crc = *crcvar;
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while (len--) crc = crc32table[(crc ^ *(blk++)) & 0xffl] ^(crc >> 8);
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*crcvar = crc;
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}
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static inline uint32_t crc32finish(uint32_t *crcvar)
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{
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*crcvar = *crcvar ^ 0xffffffffl;
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return *crcvar;
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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