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ffmpeg / tools / trasher.c @ 5988dc9e

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/*
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 * Copyright (c) 2007 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include <stdio.h>
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#include <inttypes.h>
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static uint32_t state;
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static uint32_t ran(void){
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    return state= state*1664525+1013904223;
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}
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int main(int argc, char** argv)
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{
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    FILE *f;
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    int count, maxburst, length;
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    if (argc < 5){
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        printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
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        return 1;
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    }
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    f= fopen(argv[1], "rb+");
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    if (!f){
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        perror(argv[1]);
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        return 2;
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    }
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    count= atoi(argv[2]);
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    maxburst= atoi(argv[3]);
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    state= atoi(argv[4]);
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    fseek(f, 0, SEEK_END);
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    length= ftell(f);
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    fseek(f, 0, SEEK_SET);
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    while(count--){
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        int burst= 1 + ran() * (uint64_t) (abs(maxburst)-1) / UINT32_MAX;
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        int pos= ran() * (uint64_t) length / UINT32_MAX;
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        fseek(f, pos, SEEK_SET);
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        if(maxburst<0) burst= -maxburst;
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        if(pos + burst > length)
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            continue;
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        while(burst--){
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            int val= ran() * 256ULL / UINT32_MAX;
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            if(maxburst<0) val=0;
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            fwrite(&val, 1, 1, f);
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        }
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    }
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    return 0;
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}