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