baf1bc3f600cf5388a79aae0ade3e03ddd8152e6
[libav.git] / tools / trasher.c
1 /*
2 * Copyright (c) 2007 Michael Niedermayer
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <time.h>
24 #include <inttypes.h>
25
26 int main(int argc, char** argv)
27 {
28 FILE *f;
29 int count, maxburst, length;
30
31 if (argc < 4){
32 printf("USAGE: trasher <filename> <count> <maxburst>\n");
33 return 1;
34 }
35
36 f= fopen(argv[1], "rb+");
37 if (!f){
38 perror(argv[1]);
39 return 2;
40 }
41 count= atoi(argv[2]);
42 maxburst= atoi(argv[3]);
43
44 srandom (time (0));
45
46 fseek(f, 0, SEEK_END);
47 length= ftell(f);
48 fseek(f, 0, SEEK_SET);
49
50 while(count--){
51 int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX;
52 int pos= random() * (uint64_t) length / RAND_MAX;
53 fseek(f, pos, SEEK_SET);
54
55 if(maxburst<0) burst= -maxburst;
56
57 if(pos + burst > length)
58 continue;
59
60 while(burst--){
61 int val= random() * 256ULL / RAND_MAX;
62
63 if(maxburst<0) val=0;
64
65 fwrite(&val, 1, 1, f);
66 }
67 }
68
69 return 0;
70 }