Update help message for the -pad* options, as they have been removed,
[libav.git] / tools / trasher.c
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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 */
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20
21#include <stdio.h>
f19a068e 22#include <stdlib.h>
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23#include <inttypes.h>
24
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25static uint32_t state;
26static uint32_t ran(void){
27 return state= state*1664525+1013904223;
28}
29
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30int main(int argc, char** argv)
31{
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32 FILE *f;
33 int count, maxburst, length;
34
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35 if (argc < 5){
36 printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
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37 return 1;
38 }
39
40 f= fopen(argv[1], "rb+");
41 if (!f){
42 perror(argv[1]);
43 return 2;
44 }
45 count= atoi(argv[2]);
46 maxburst= atoi(argv[3]);
47cf98ef 47 state= atoi(argv[4]);
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48
49 fseek(f, 0, SEEK_END);
50 length= ftell(f);
51 fseek(f, 0, SEEK_SET);
52
53 while(count--){
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54 int burst= 1 + ran() * (uint64_t) (abs(maxburst)-1) / UINT32_MAX;
55 int pos= ran() * (uint64_t) length / UINT32_MAX;
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56 fseek(f, pos, SEEK_SET);
57
58 if(maxburst<0) burst= -maxburst;
59
60 if(pos + burst > length)
61 continue;
62
63 while(burst--){
47cf98ef 64 int val= ran() * 256ULL / UINT32_MAX;
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65
66 if(maxburst<0) val=0;
67
68 fwrite(&val, 1, 1, f);
69 }
70 }
71
72 return 0;
73}