mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-24 08:12:44 +00:00
Make trasher use a well defined random number generator and allow the seed to be specified on the cmd line.
Originally committed as revision 22228 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
parent
814c56413d
commit
47cf98efcb
@ -24,13 +24,18 @@
|
||||
#include <time.h>
|
||||
#include <inttypes.h>
|
||||
|
||||
static uint32_t state;
|
||||
static uint32_t ran(void){
|
||||
return state= state*1664525+1013904223;
|
||||
}
|
||||
|
||||
int main(int argc, char** argv)
|
||||
{
|
||||
FILE *f;
|
||||
int count, maxburst, length;
|
||||
|
||||
if (argc < 4){
|
||||
printf("USAGE: trasher <filename> <count> <maxburst>\n");
|
||||
if (argc < 5){
|
||||
printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
|
||||
return 1;
|
||||
}
|
||||
|
||||
@ -41,16 +46,15 @@ int main(int argc, char** argv)
|
||||
}
|
||||
count= atoi(argv[2]);
|
||||
maxburst= atoi(argv[3]);
|
||||
|
||||
srandom (time (0));
|
||||
state= atoi(argv[4]);
|
||||
|
||||
fseek(f, 0, SEEK_END);
|
||||
length= ftell(f);
|
||||
fseek(f, 0, SEEK_SET);
|
||||
|
||||
while(count--){
|
||||
int burst= 1 + random() * (uint64_t) (abs(maxburst)-1) / RAND_MAX;
|
||||
int pos= random() * (uint64_t) length / RAND_MAX;
|
||||
int burst= 1 + ran() * (uint64_t) (abs(maxburst)-1) / UINT32_MAX;
|
||||
int pos= ran() * (uint64_t) length / UINT32_MAX;
|
||||
fseek(f, pos, SEEK_SET);
|
||||
|
||||
if(maxburst<0) burst= -maxburst;
|
||||
@ -59,7 +63,7 @@ int main(int argc, char** argv)
|
||||
continue;
|
||||
|
||||
while(burst--){
|
||||
int val= random() * 256ULL / RAND_MAX;
|
||||
int val= ran() * 256ULL / UINT32_MAX;
|
||||
|
||||
if(maxburst<0) val=0;
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user