A little proggy i wrote years ago.
[libav.git] / tools / trasher.c
1
2 #include <stdio.h>
3 #include <stdlib.h>
4 #include <time.h>
5 #include <inttypes.h>
6
7 int main(int argc, char** argv)
8 {
9 FILE *f= fopen(argv[1], "rb+");
10 int count= atoi(argv[2]);
11 int maxburst= atoi(argv[3]);
12 int length, i;
13
14 srand (time (0));
15
16 fseek(f, 0, SEEK_END);
17 length= ftell(f);
18 fseek(f, 0, SEEK_SET);
19
20 while(count--){
21 int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX;
22 int pos= random() * (uint64_t) length / RAND_MAX;
23 fseek(f, pos, SEEK_SET);
24
25 if(maxburst<0) burst= -maxburst;
26
27 if(pos + burst > length)
28 continue;
29
30 while(burst--){
31 int val= random() * 256ULL / RAND_MAX;
32
33 if(maxburst<0) val=0;
34
35 fwrite(&val, 1, 1, f);
36 }
37 }
38
39 return 0;
40 }