29 lines
474 B
C
29 lines
474 B
C
#include <stddef.h>
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#include <stdint.h>
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#include "util/crc.h"
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uint32_t crc32(const void *src, size_t nbytes, uint32_t in)
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{
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const uint8_t *bytes;
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uint32_t crc;
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size_t i;
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bytes = src;
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crc = ~in;
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for (i = 0 ; i < nbytes * 8 ; i++) {
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if (i % 8 == 0) {
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crc ^= *bytes++;
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}
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if (crc & 1) {
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crc = (crc >> 1) ^ 0xEDB88320;
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} else {
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crc = (crc >> 1);
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}
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}
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return ~crc;
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}
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