Split global .gitignore file into per-directory files

[ffmpeg] / tools / trasher.c

diff --git a/tools/trasher.c b/tools/trasher.c
index cc9f368fb49376ade9336efe618db730afd5efc7..35625e9a62ce9c099f85d55e587eef46daa5019b 100644 (file)
--- a/tools/trasher.c
+++ b/tools/trasher.c
@@ -1,36 +1,74 @@
+/*
+ * Copyright (c) 2007 Michael Niedermayer
+ *
+ * This file is part of Libav.
+ *
+ * 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.
+ *
+ * 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 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>
+#include <errno.h>
+#include <string.h>
 
-int main(int argc, char** argv)
+static uint32_t state;
+static uint32_t ran(void)
 {
-    FILE *f= fopen(argv[1], "rb+");
-    int count= atoi(argv[2]);
-    int maxburst= atoi(argv[3]);
-    int length;
+    return state = state * 1664525 + 1013904223;
+}
+
+int main(int argc, char **argv)
+{
+    FILE *f;
+    int count, maxburst, length;
 
-    srand (time (0));
+    if (argc < 5) {
+        printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
+        return 1;
+    }
+
+    f = fopen(argv[1], "rb+");
+    if (!f) {
+        perror(argv[1]);
+        return 2;
+    }
+    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);
         }