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#ifndef __CRC32_H__ |
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#define __CRC32_H__ |
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#ifndef _ANSI_ARGS_ |
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#ifdef PROTOTYPES |
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#define _ANSI_ARGS_(c) c |
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#else |
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#define _ANSI_ARGS_(c) () |
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#endif |
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#endif |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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typedef unsigned long crc32_t; |
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#define Z_NULL 0 |
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crc32_t crc32 _ANSI_ARGS_((crc32_t crc, const unsigned char *buf, unsigned int len)); |
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/* |
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Update a running crc with the bytes buf[0..len-1] and return the updated |
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crc. If buf is NULL, this function returns the required initial value |
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for the crc. Pre- and post-conditioning (one's complement) is performed |
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within this function so it shouldn't be done by the application. |
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Usage example: |
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uLong crc = crc32(0L, Z_NULL, 0); |
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while (read_buffer(buffer, length) != EOF) { |
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crc = crc32(crc, buffer, length); |
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} |
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if (crc != original_crc) error(); |
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*/ |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif |
