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-rw-r--r--util/garbage-gen.c67
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;
+}