// SPDX-License-Identifier: GPL-2.0-only
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/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
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/* Usage example:
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$ ./crc32hash "Dual Speed"
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*/
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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static unsigned int crc32(unsigned char const *p, unsigned int len)
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{
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int i;
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unsigned int crc = 0;
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while (len--) {
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crc ^= *p++;
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for (i = 0; i < 8; i++)
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crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
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}
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return crc;
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}
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int main(int argc, char **argv) {
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unsigned int result;
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if (argc != 2) {
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printf("no string passed as argument\n");
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return -1;
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}
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result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
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printf("0x%x\n", result);
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return 0;
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}
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