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tools/trasher.c

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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 }

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