2 * Copyright (C) 2013 STRATO. All rights reserved.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
25 void print_usage(int status)
27 printf("usage: btrfs-crc filename\n");
28 printf(" print out the btrfs crc for \"filename\"\n");
29 printf("usage: btrfs-crc -c crc [-s seed] [-l length]\n");
30 printf(" brute force search for file names with the given crc\n");
31 printf(" -s seed the random seed (default: random)\n");
32 printf(" -l length the length of the file names (default: 10)\n");
33 printf("usage: btrfs-crc -h\n");
34 printf(" print this message\n");
38 int main(int argc, char **argv)
41 unsigned long checksum = 0;
49 while ((c = getopt(argc, argv, "l:c:s:h")) != -1) {
52 length = atol(optarg);
55 sscanf(optarg, "%li", &checksum);
72 if (check_argc_min(argc - optind, 1))
75 printf("%12u - %s\n", crc32c(~1, str, strlen(str)), str);
86 for (i = 0; i < length; i++)
87 buf[i] = rand_range(94) + 33;
88 if (crc32c(~1, buf, length) == checksum)
89 printf("%12lu - %.*s\n", checksum, length, buf);