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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 
 11 static 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 
 23 int 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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