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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:54:16 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:54:16 +0000 |
commit | 485f6ecd453d8a2fd8b9b9fadea03159d8b50797 (patch) | |
tree | 32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /util/garbage-gen.c | |
parent | Initial commit. (diff) | |
download | grub2-485f6ecd453d8a2fd8b9b9fadea03159d8b50797.tar.xz grub2-485f6ecd453d8a2fd8b9b9fadea03159d8b50797.zip |
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'util/garbage-gen.c')
-rw-r--r-- | util/garbage-gen.c | 67 |
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; +} |