[FFmpeg-cvslog] r22228 - trunk/tools/trasher.c
michael
subversion
Sat Mar 6 02:31:17 CET 2010
Author: michael
Date: Sat Mar 6 02:31:17 2010
New Revision: 22228
Log:
Make trasher use a well defined random number generator and allow the seed to be specified on teh cmd line.
Modified:
trunk/tools/trasher.c
Modified: trunk/tools/trasher.c
==============================================================================
--- trunk/tools/trasher.c Fri Mar 5 23:38:48 2010 (r22227)
+++ trunk/tools/trasher.c Sat Mar 6 02:31:17 2010 (r22228)
@@ -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;
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