1 files changed, 67 insertions, 0 deletions
diff --git a/util/garbage-gen.c b/util/garbage-gen.c
new file mode 100644
index 0000000..ccba1bf
--- /dev/null
+++ b/util/garbage-gen.c
@@ -0,0 +1,67 @@
+/*
+ *  GRUB  --  GRand Unified Bootloader
+ *  Copyright (C) 2013  Free Software Foundation, Inc.
+ *
+ *  GRUB is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  GRUB 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 General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* Standard random generator is slow. For FS testing we need just some
+   garbage files, we don't need them to be high-quality random.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <sys/time.h>
+
+static unsigned long long buffer[1048576];
+
+int
+main (int argc, char **argv)
+{
+  unsigned long long high = 0, low = 1;
+  unsigned long i, j;
+  unsigned long long cnt = strtoull (argv[1], 0, 0);
+  struct timeval tv;
+  gettimeofday (&tv, NULL);
+  high = tv.tv_sec;
+  low = tv.tv_usec;
+  if (!high)
+    high = 1;
+  if (!low)
+    low = 2;
+
+  for (j = 0; j < (cnt + sizeof (buffer) - 1)  / sizeof (buffer); j++)
+    {
+      for (i = 0; i < sizeof (buffer) / sizeof (buffer[0]); i += 2)
+	{
+	  int c1 = 0, c2 = 0;
+	  buffer[i] = low;
+	  buffer[i+1] = high;
+	  if (low & (1ULL << 63))
+	    c1 = 1;
+	  low <<= 1;
+	  if (high & (1ULL << 63))
+	    c2 = 1;
+	  high = (high << 1) | c1;
+	  if (c2)
+	    low ^= 0x87;
+	}
+      if (sizeof (buffer) < cnt - sizeof (buffer) * j)
+	fwrite (buffer, 1, sizeof (buffer), stdout);
+      else
+	fwrite (buffer, 1, cnt - sizeof (buffer) * j, stdout);
+    }
+  return 0;
+}