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
  12 static 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
  24 int 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 }