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1// SPDX-License-Identifier: GPL-2.0-only2/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */3/* Usage example:4$ ./crc32hash "Dual Speed"5*/6 7#include <string.h>8#include <stdio.h>9#include <ctype.h>10#include <stdlib.h>11 12static unsigned int crc32(unsigned char const *p, unsigned int len)13{14 int i;15 unsigned int crc = 0;16 while (len--) {17 crc ^= *p++;18 for (i = 0; i < 8; i++)19 crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);20 }21 return crc;22}23 24int main(int argc, char **argv) {25 unsigned int result;26 if (argc != 2) {27 printf("no string passed as argument\n");28 return -1;29 }30 result = crc32((unsigned char const *)argv[1], strlen(argv[1]));31 printf("0x%x\n", result);32 return 0;33}34