cbm.c (09.11.10)
Clusters Bitmap creation code.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Free exFAT implementation.
+ Copyright (C) 2011-2015 Andrew Nayenko
- This program is free software: you can redistribute it and/or modify
+ 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 3 of the License, or
+ 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,
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, see <http://www.gnu.org/licenses/>.
+ 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 <unistd.h>
-#include <limits.h>
-#include <inttypes.h>
-#include <errno.h>
-#include "mkexfat.h"
+#include "cbm.h"
+#include "fat.h"
#include "uct.h"
#include "rootdir.h"
+#include <limits.h>
+#include <string.h>
-off_t cbm_alignment(void)
+static off_t cbm_alignment(void)
{
- return CLUSTER_SIZE(sb);
+ return get_cluster_size();
}
-off_t cbm_size(void)
+static off_t cbm_size(void)
{
- return DIV_ROUND_UP(le32_to_cpu(sb.cluster_count), CHAR_BIT);
+ return DIV_ROUND_UP(
+ (get_volume_size() - get_position(&cbm)) / get_cluster_size(),
+ CHAR_BIT);
}
-int cbm_write(struct exfat_dev* dev, off_t base)
+static int cbm_write(struct exfat_dev* dev)
{
uint32_t allocated_clusters =
- DIV_ROUND_UP(cbm_size(), CLUSTER_SIZE(sb)) +
- DIV_ROUND_UP(uct_size(), CLUSTER_SIZE(sb)) +
- DIV_ROUND_UP(rootdir_size(), CLUSTER_SIZE(sb));
- size_t bitmap_size = DIV_ROUND_UP(allocated_clusters, CHAR_BIT);
- uint8_t* bitmap = malloc(bitmap_size);
+ 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)
- return errno;
+ {
+ 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 * CHAR_BIT; i++)
+ for (i = 0; i < bitmap_size; i++)
if (i < allocated_clusters)
BMAP_SET(bitmap, i);
- else
- BMAP_CLR(bitmap, i);
- if (exfat_write(dev, bitmap, bitmap_size) < 0)
- return errno;
+ 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);
-
- sb.cluster_sector_start = cpu_to_le32(base / SECTOR_SIZE(sb));
- bitmap_entry.start_cluster = cpu_to_le32(OFFSET_TO_CLUSTER(base));
- bitmap_entry.size = cpu_to_le64(cbm_size());
return 0;
}
+
+const struct fs_object cbm =
+{
+ .get_alignment = cbm_alignment,
+ .get_size = cbm_size,
+ .write = cbm_write,
+};