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crc32hash.c

/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
/* Usage example:
$ ./crc32hash "Dual Speed"
*/

#include <string.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>

unsigned int crc32(unsigned char const *p, unsigned int len)
{
      int i;
      unsigned int crc = 0;
      while (len--) {
            crc ^= *p++;
            for (i = 0; i < 8; i++)
                  crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
      }
      return crc;
}

int main(int argc, char **argv) {
      unsigned int result;
      if (argc != 2) {
            printf("no string passed as argument\n");
            return -1;
      }
      result = crc32(argv[1], strlen(argv[1]));
      printf("0x%x\n", result);
      return 0;
}

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