You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
69 lines
1.1 KiB
69 lines
1.1 KiB
/*
|
|
* crcsum.c
|
|
*
|
|
* Copyright (C) 2013 Theodore Ts'o.
|
|
*
|
|
* %Begin-Header%
|
|
* This file may be redistributed under the terms of the GNU Public
|
|
* License.
|
|
* %End-Header%
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#ifdef HAVE_GETOPT_H
|
|
#include <getopt.h>
|
|
#endif
|
|
#include <fcntl.h>
|
|
|
|
#include "et/com_err.h"
|
|
#include "ss/ss.h"
|
|
#include "ext2fs/ext2fs.h"
|
|
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
int c;
|
|
uint32_t crc = ~0;
|
|
uint32_t (*csum_func)(uint32_t crc, unsigned char const *p,
|
|
size_t len);
|
|
FILE *f;
|
|
|
|
csum_func = ext2fs_crc32c_le;
|
|
|
|
while ((c = getopt (argc, argv, "h")) != EOF) {
|
|
switch (c) {
|
|
case 'h':
|
|
default:
|
|
com_err(argv[0], 0, "Usage: crcsum [file]\n");
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
if (optind == argc)
|
|
f = stdin;
|
|
else {
|
|
f = fopen(argv[optind], "r");
|
|
if (!f) {
|
|
com_err(argv[0], errno, "while trying to open %s\n",
|
|
argv[optind]);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
while (!feof(f)) {
|
|
unsigned char buf[4096];
|
|
|
|
int c = fread(buf, 1, sizeof(buf), f);
|
|
|
|
if (c)
|
|
crc = csum_func(crc, buf, c);
|
|
}
|
|
printf("%u\n", crc);
|
|
return 0;
|
|
}
|