cbm.c (09.11.10)
Clusters Bitmap creation code.
- Copyright (C) 2009, 2010 Andrew Nayenko
+ Copyright (C) 2011-2013 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
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
-#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"
-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));
+ 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 = DIV_ROUND_UP(allocated_clusters, CHAR_BIT);
uint8_t* bitmap = malloc(bitmap_size);
size_t i;
if (bitmap == NULL)
- return errno;
+ {
+ exfat_error("failed to allocate bitmap of %zu bytes", bitmap_size);
+ return 1;
+ }
for (i = 0; i < bitmap_size * CHAR_BIT; i++)
if (i < allocated_clusters)
else
BMAP_CLR(bitmap, i);
if (exfat_write(dev, bitmap, bitmap_size) < 0)
- return errno;
+ {
+ exfat_error("failed to write bitmap of %zu bytes", bitmap_size);
+ 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,
+};