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.
26 printf("usage: btrfs-crc filename\n");
27 printf(" print out the btrfs crc for \"filename\"\n");
28 printf("usage: btrfs-crc filename -c crc [-s seed] [-l length]\n");
29 printf(" brute force search for file names with the given crc\n");
30 printf(" -s seed the random seed (default: random)\n");
31 printf(" -l length the length of the file names (default: 10)\n");
35 int main(int argc
, char **argv
)
38 unsigned long checksum
= 0;
42 int seed
= getpid() ^ getppid();
46 while ((c
= getopt(argc
, argv
, "l:c:s:h")) != -1) {
49 length
= atol(optarg
);
52 sscanf(optarg
, "%li", &checksum
);
69 fprintf(stderr
, "not enough arguments\n");
72 printf("%12u - %s\n", crc32c(~1, str
, strlen(str
)), str
);
82 for (i
= 0; i
< length
; i
++)
83 buf
[i
] = rand() % 94 + 33;
84 if (crc32c(~1, buf
, length
) == checksum
)
85 printf("%12lu - %.*s\n", checksum
, length
, buf
);