test/bad_crc.c

   1 #define _GNU_SOURCE
   2 #define _FILE_OFFSET_BITS 64
   3
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include "omfs.h"
   8 #include "bits.h"
   9 #include "config.h"
  10
  11 void make_bad_crc(FILE *fp)
  12 {
  13         char crc[] = {0, 0};
  14         omfs_super_t super;
  15         omfs_root_t root;
  16
  17         omfs_read_super(fp, &super);
  18         omfs_read_root_block(fp, &super, &root);
  19
  20         fseeko(fp, swap_be64(root.root_dir) * swap_be32(super.blocksize) +
  21                 12, SEEK_SET);
  22         fwrite(crc, 2, 1, fp);
  23 }
  24
  25 int main(int argc, char **argv)
  26 {
  27         if (argc < 2)
  28                 return 1;
  29
  30         FILE *fp = fopen(argv[1], "r+");
  31
  32         make_bad_crc(fp);
  33         fclose(fp);
  34         return 0;
  35 }
  36