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-rw-r--r--exfat/mkfs/cbm.c79
1 files changed, 79 insertions, 0 deletions
diff --git a/exfat/mkfs/cbm.c b/exfat/mkfs/cbm.c
new file mode 100644
index 000000000..eb67592fd
--- /dev/null
+++ b/exfat/mkfs/cbm.c
@@ -0,0 +1,79 @@
+/*
+ cbm.c (09.11.10)
+ Clusters Bitmap creation code.
+
+ Free exFAT implementation.
+ Copyright (C) 2011-2015 Andrew Nayenko
+
+ This program 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 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#include "cbm.h"
+#include "fat.h"
+#include "uct.h"
+#include "rootdir.h"
+#include <limits.h>
+#include <string.h>
+
+static loff_t cbm_alignment(void)
+{
+ return get_cluster_size();
+}
+
+static loff_t cbm_size(void)
+{
+ return DIV_ROUND_UP(
+ (get_volume_size() - get_position(&cbm)) / get_cluster_size(),
+ CHAR_BIT);
+}
+
+static int cbm_write(struct exfat_dev* dev)
+{
+ uint32_t allocated_clusters =
+ DIV_ROUND_UP(cbm.get_size(), get_cluster_size()) +
+ DIV_ROUND_UP(uct.get_size(), get_cluster_size()) +
+ DIV_ROUND_UP(rootdir.get_size(), get_cluster_size());
+ size_t bitmap_size = ROUND_UP(allocated_clusters, CHAR_BIT);
+ bitmap_t* bitmap = malloc(BMAP_SIZE(bitmap_size));
+ size_t i;
+
+ if (bitmap == NULL)
+ {
+ exfat_error("failed to allocate bitmap of %zu bytes",
+ BMAP_SIZE(bitmap_size));
+ return 1;
+ }
+ memset(bitmap, 0, BMAP_SIZE(bitmap_size));
+
+ for (i = 0; i < bitmap_size; i++)
+ if (i < allocated_clusters)
+ BMAP_SET(bitmap, i);
+ if (exfat_write(dev, bitmap, bitmap_size / CHAR_BIT) < 0)
+ {
+ free(bitmap);
+ exfat_error("failed to write bitmap of %zu bytes",
+ bitmap_size / CHAR_BIT);
+ return 1;
+ }
+ free(bitmap);
+ return 0;
+}
+
+const struct fs_object cbm =
+{
+ .get_alignment = cbm_alignment,
+ .get_size = cbm_size,
+ .write = cbm_write,
+};