A little proggy i wrote years ago.

This simply writes burts of random data into a file. Great for testing error
robustness/resilience/concealment.


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@11459 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

tools/trasher.c

+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <inttypes.h>
+
+int main(int argc, char** argv)
+{
+    FILE *f= fopen(argv[1], "rb+");
+    int count= atoi(argv[2]);
+    int maxburst= atoi(argv[3]);
+    int length, i;
+
+    srand (time (0));
+
+    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;
+        fseek(f, pos, SEEK_SET);
+
+        if(maxburst<0) burst= -maxburst;
+
+        if(pos + burst > length)
+            continue;
+
+        while(burst--){
+            int val= random() * 256ULL / RAND_MAX;
+
+            if(maxburst<0) val=0;
+
+            fwrite(&val, 1, 1, f);
+        }
+    }
+
+    return 0;
+}