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 <inttypes.h>
24 #include <errno.h>
25 #include <string.h>
26
28 static uint32_t
ran(
void)
29 {
31 }
32
34 {
37 fprintf(stderr, "seek failed\n");
38 exit(1);
39 }
40 }
41
42 int main(
int argc,
char **argv)
43 {
45 int count, maxburst, length;
46
47 if (argc < 5) {
48 printf(
"USAGE: trasher <filename> <count> <maxburst> <seed>\n");
49 return 1;
50 }
51
52 f = fopen(argv[1],
"rb+");
54 perror(argv[1]);
55 return 2;
56 }
57 count = atoi(argv[2]);
58 maxburst = atoi(argv[3]);
59 state = atoi(argv[4]);
60
64
65 while (count--) {
66 int burst = 1 +
ran() * (uint64_t) (
abs(maxburst) - 1) / UINT32_MAX;
67 int pos =
ran() * (uint64_t) length / UINT32_MAX;
69
70 if (maxburst < 0)
71 burst = -maxburst;
72
73 if (
pos + burst > length)
74 continue;
75
76 while (burst--) {
77 int val =
ran() * 256ULL / UINT32_MAX;
78
79 if (maxburst < 0)
81
82 fwrite(&
val, 1, 1,
f);
83 }
84 }
85
86 return 0;
87 }