32 lines
588 B
C
32 lines
588 B
C
#ifndef __crc32_h
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#define __crc32_h
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/* crc32.h */
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/* wrapper for gall library */
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typedef unsigned long crc32_t;
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#define Z_NULL 0
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#define byte(a) ((unsigned char)(a))
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extern crc32_t __crc32_table[256];
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static crc32_t updCrc32(unsigned char ch, crc32_t crc)
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{
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return (crc32_t)(__crc32_table[byte(crc) ^ byte(ch)] ^ (crc >> 8));
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}
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static crc32_t crc32(crc32_t crc, const unsigned char *buf, unsigned int len)
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{
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if (buf == Z_NULL) return 0L;
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crc = crc ^ 0xffffffffL;
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while (len--)
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{
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crc = updCrc32(*buf++, crc);
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}
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return crc ^ 0xffffffffL;
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}
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#endif /* __crc32_h */
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