/* * 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 <time.h>#include <inttypes.h>int main(int argc, char** argv){    FILE *f;    int count, maxburst, length;    if (argc < 4){        printf("USAGE: trasher <filename> <count> <maxburst>\n");        return 1;    }    f= fopen(argv[1], "rb+");    if (!f){        perror(argv[1]);        return 2;    }    count= atoi(argv[2]);    maxburst= atoi(argv[3]);    srandom (time (0));    fseek(f, 0, SEEK_END);    length= ftell(f);    fseek(f, 0, SEEK_SET);    while(count--){        int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX;        int pos= random() * (uint64_t) length / RAND_MAX;        fseek(f, pos, SEEK_SET);        if(maxburst<0) burst= -maxburst;        if(pos + burst > length)            continue;        while(burst--){            int val= random() * 256ULL / RAND_MAX;            if(maxburst<0) val=0;            fwrite(&val, 1, 1, f);        }    }    return 0;}