2 * Copyright (c) 2007 Michael Niedermayer
4 * This file is part of FFmpeg.
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.
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.
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
27 static uint32_t state
;
28 static uint32_t ran(void)
30 return state
= state
* 1664525 + 1013904223;
33 int main(int argc
, char **argv
)
36 int count
, maxburst
, length
;
39 printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
43 f
= fopen(argv
[1], "rb+");
48 count
= atoi(argv
[2]);
49 maxburst
= atoi(argv
[3]);
50 state
= atoi(argv
[4]);
52 fseek(f
, 0, SEEK_END
);
54 fseek(f
, 0, SEEK_SET
);
57 int burst
= 1 + ran() * (uint64_t) (abs(maxburst
) - 1) / UINT32_MAX
;
58 int pos
= ran() * (uint64_t) length
/ UINT32_MAX
;
59 if (fseek(f
, pos
, SEEK_SET
) < 0) {
60 fprintf(stderr
, "seek failed\n");
67 if (pos
+ burst
> length
)
71 int val
= ran() * 256ULL / UINT32_MAX
;
76 fwrite(&val
, 1, 1, f
);