mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-21 10:55:51 +02:00
82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
|
|
* Copyright (c) 2007 Michael Niedermayer
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg 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
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <inttypes.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
|
|
static uint32_t state;
|
|
static uint32_t ran(void)
|
|
{
|
|
return state = state * 1664525 + 1013904223;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
FILE *f;
|
|
int count, maxburst, length;
|
|
|
|
if (argc < 5) {
|
|
printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
|
|
return 1;
|
|
}
|
|
|
|
f = fopen(argv[1], "rb+");
|
|
if (!f) {
|
|
perror(argv[1]);
|
|
return 2;
|
|
}
|
|
count = atoi(argv[2]);
|
|
maxburst = atoi(argv[3]);
|
|
state = atoi(argv[4]);
|
|
|
|
fseek(f, 0, SEEK_END);
|
|
length = ftell(f);
|
|
fseek(f, 0, SEEK_SET);
|
|
|
|
while (count--) {
|
|
int burst = 1 + ran() * (uint64_t) (abs(maxburst) - 1) / UINT32_MAX;
|
|
int pos = ran() * (uint64_t) length / UINT32_MAX;
|
|
if (fseek(f, pos, SEEK_SET) < 0) {
|
|
fprintf(stderr, "seek failed\n");
|
|
return 1;
|
|
}
|
|
|
|
if (maxburst < 0)
|
|
burst = -maxburst;
|
|
|
|
if (pos + burst > length)
|
|
continue;
|
|
|
|
while (burst--) {
|
|
int val = ran() * 256ULL / UINT32_MAX;
|
|
|
|
if (maxburst < 0)
|
|
val = 0;
|
|
|
|
fwrite(&val, 1, 1, f);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|