// SPDX-License-Identifier: GPL-2.0-only
/* 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;
}