2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 * Fuzzer to fuzz a file
22 #include <sys/types.h>
25 int main(int argc, char *argv[])
30 int changesPerBuffer = 0;
33 unsigned char buffer[1000000];
39 while((c = getopt(argc,argv,"p:")) != -1){
47 printf("-p value less than 100 is invalid\n");
52 printf(" Needs a file name to fuzz\n");
56 h = open(argv[optind], O_RDWR);
57 flen = lseek(h,0,SEEK_END);
60 printf(" File is too short\n");
64 nbuffers = (flen + sizeof(buffer) - 1) / sizeof(buffer);
66 changesPerBuffer = 1+ (sizeof(buffer) * 8) / prob;
68 printf("Fuzzing file %s. Size %d, probablity 1/%d, changing %d bits in each of %d buffers\n",
69 argv[optind],flen,prob,changesPerBuffer,nbuffers);
73 for(b = 0; b < nbuffers; b++){
74 printf("buffer %d\n",b);
75 lseek(h,b * sizeof(buffer),SEEK_SET);
76 bufsize = read(h,buffer,sizeof(buffer));
77 for(i = 0; i < changesPerBuffer; i++){
78 x = rand() % (sizeof(buffer) * 8);
79 buffer[x >> 3] ^= (1 << (x & 7));
81 lseek(h,b * sizeof(buffer),SEEK_SET);
82 write(h,buffer,bufsize);