/* 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>
  
  static 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
  ");
  		return -1;
  	}
  	result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
  	printf("0x%x
  ", result);
  	return 0;
  }