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 <time.h> 24#include <inttypes.h> 25 26int main(int argc, char** argv) 27{ 28 FILE *f; 29 int count, maxburst, length; 30 31 if (argc < 4){ 32 printf("USAGE: trasher <filename> <count> <maxburst>\n"); 33 return 1; 34 } 35 36 f= fopen(argv[1], "rb+"); 37 if (!f){ 38 perror(argv[1]); 39 return 2; 40 } 41 count= atoi(argv[2]); 42 maxburst= atoi(argv[3]); 43 44 srandom (time (0)); 45 46 fseek(f, 0, SEEK_END); 47 length= ftell(f); 48 fseek(f, 0, SEEK_SET); 49 50 while(count--){ 51 int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX; 52 int pos= random() * (uint64_t) length / RAND_MAX; 53 fseek(f, pos, SEEK_SET); 54 55 if(maxburst<0) burst= -maxburst; 56 57 if(pos + burst > length) 58 continue; 59 60 while(burst--){ 61 int val= random() * 256ULL / RAND_MAX; 62 63 if(maxburst<0) val=0; 64 65 fwrite(&val, 1, 1, f); 66 } 67 } 68 69 return 0; 70} 71