X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=tools%2Ftrasher.c;h=11605b8a8e2b3f6bd474b35c93af8d6724776e6c;hb=1a6b9a98ceacc3aca35ab354f9e97e3ac01b0ded;hp=9e1961f857b0be6485e62595243738dd5e974432;hpb=c33820e52e8829668ef59b7ead6acee09558504f;p=ffmpeg

diff --git a/tools/trasher.c b/tools/trasher.c
index 9e1961f857b..11605b8a8e2 100644
--- a/tools/trasher.c
+++ b/tools/trasher.c
@@ -1,66 +1,72 @@
 /*
  * Copyright (c) 2007 Michael Niedermayer
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include <stdio.h>
 #include <stdlib.h>
-#include <time.h>
 #include <inttypes.h>
 
-int main(int argc, char** argv)
+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;
     }
 
-    f= fopen(argv[1], "rb+");
-    if (!f){
+    f = fopen(argv[1], "rb+");
+    if (!f) {
         perror(argv[1]);
         return 2;
     }
-    count= atoi(argv[2]);
-    maxburst= atoi(argv[3]);
-
-    srand (time (0));
+    count    = atoi(argv[2]);
+    maxburst = atoi(argv[3]);
+    state    = atoi(argv[4]);
 
     fseek(f, 0, SEEK_END);
-    length= ftell(f);
+    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;
+    while (count--) {
+        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;
+        if (maxburst < 0)
+            burst = -maxburst;
 
-        if(pos + burst > length)
+        if (pos + burst > length)
             continue;
 
-        while(burst--){
-            int val= random() * 256ULL / RAND_MAX;
+        while (burst--) {
+            int val = ran() * 256ULL / UINT32_MAX;
 
-            if(maxburst<0) val=0;
+            if (maxburst < 0)
+                val = 0;
 
             fwrite(&val, 1, 1, f);
         }