LXR linux/tools/pcmcia/crc32hash.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/* 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