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