| /* |
| * Copyright (C) 2013 STRATO. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public |
| * License v2 as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public |
| * License along with this program; if not, write to the |
| * Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| * Boston, MA 021110-1307, USA. |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include "crc32c.h" |
| #include "utils.h" |
| |
| void usage(void) |
| { |
| printf("usage: btrfs-crc filename\n"); |
| printf(" print out the btrfs crc for \"filename\"\n"); |
| printf("usage: btrfs-crc filename -c crc [-s seed] [-l length]\n"); |
| printf(" brute force search for file names with the given crc\n"); |
| printf(" -s seed the random seed (default: random)\n"); |
| printf(" -l length the length of the file names (default: 10)\n"); |
| exit(1); |
| } |
| |
| int main(int argc, char **argv) |
| { |
| int c; |
| unsigned long checksum = 0; |
| char *str; |
| char *buf; |
| int length = 10; |
| int seed = getpid() ^ getppid(); |
| int loop = 0; |
| int i; |
| |
| while ((c = getopt(argc, argv, "l:c:s:h")) != -1) { |
| switch (c) { |
| case 'l': |
| length = atol(optarg); |
| break; |
| case 'c': |
| sscanf(optarg, "%li", &checksum); |
| loop = 1; |
| break; |
| case 's': |
| seed = atol(optarg); |
| break; |
| case 'h': |
| usage(); |
| case '?': |
| return 255; |
| } |
| } |
| |
| set_argv0(argv); |
| str = argv[optind]; |
| |
| if (!loop) { |
| if (check_argc_min(argc - optind, 1)) |
| return 255; |
| |
| printf("%12u - %s\n", crc32c(~1, str, strlen(str)), str); |
| return 0; |
| } |
| |
| buf = malloc(length); |
| if (!buf) |
| return -ENOMEM; |
| srand(seed); |
| |
| while (1) { |
| for (i = 0; i < length; i++) |
| buf[i] = rand() % 94 + 33; |
| if (crc32c(~1, buf, length) == checksum) |
| printf("%12lu - %.*s\n", checksum, length, buf); |
| } |
| |
| return 0; |
| } |