00001 /* 00002 * Copyright (c) 2007 Michael Niedermayer 00003 * 00004 * This file is part of FFmpeg. 00005 * 00006 * FFmpeg is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * FFmpeg is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with FFmpeg; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 00021 #include <stdio.h> 00022 #include <stdlib.h> 00023 #include <time.h> 00024 #include <inttypes.h> 00025 00026 int main(int argc, char** argv) 00027 { 00028 FILE *f; 00029 int count, maxburst, length; 00030 00031 if (argc < 4){ 00032 printf("USAGE: trasher <filename> <count> <maxburst>\n"); 00033 return 1; 00034 } 00035 00036 f= fopen(argv[1], "rb+"); 00037 if (!f){ 00038 perror(argv[1]); 00039 return 2; 00040 } 00041 count= atoi(argv[2]); 00042 maxburst= atoi(argv[3]); 00043 00044 srandom (time (0)); 00045 00046 fseek(f, 0, SEEK_END); 00047 length= ftell(f); 00048 fseek(f, 0, SEEK_SET); 00049 00050 while(count--){ 00051 int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX; 00052 int pos= random() * (uint64_t) length / RAND_MAX; 00053 fseek(f, pos, SEEK_SET); 00054 00055 if(maxburst<0) burst= -maxburst; 00056 00057 if(pos + burst > length) 00058 continue; 00059 00060 while(burst--){ 00061 int val= random() * 256ULL / RAND_MAX; 00062 00063 if(maxburst<0) val=0; 00064 00065 fwrite(&val, 1, 1, f); 00066 } 00067 } 00068 00069 return 0; 00070 }