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 25static uint32_t state; 26static uint32_t ran(void){ 27 return state= state*1664525+1013904223; 28} 29 30int main(int argc, char** argv) 31{ 32 FILE *f; 33 int count, maxburst, length; 34 35 if (argc < 5){ 36 printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n"); 37 return 1; 38 } 39 40 f= fopen(argv[1], "rb+"); 41 if (!f){ 42 perror(argv[1]); 43 return 2; 44 } 45 count= atoi(argv[2]); 46 maxburst= atoi(argv[3]); 47 state= atoi(argv[4]); 48 49 fseek(f, 0, SEEK_END); 50 length= ftell(f); 51 fseek(f, 0, SEEK_SET); 52 53 while(count--){ 54 int burst= 1 + ran() * (uint64_t) (abs(maxburst)-1) / UINT32_MAX; 55 int pos= ran() * (uint64_t) length / UINT32_MAX; 56 fseek(f, pos, SEEK_SET); 57 58 if(maxburst<0) burst= -maxburst; 59 60 if(pos + burst > length) 61 continue; 62 63 while(burst--){ 64 int val= ran() * 256ULL / UINT32_MAX; 65 66 if(maxburst<0) val=0; 67 68 fwrite(&val, 1, 1, f); 69 } 70 } 71 72 return 0; 73} 74