Update upstream source from tag 'upstream/1.3.0+git20220115'

[sven/fuse-exfat.git] / mkfs / cbm.c

diff --git a/mkfs/cbm.c b/mkfs/cbm.c
new file mode 100644 (file)
index 0000000..ad5accc
--- /dev/null
+++ b/mkfs/cbm.c
@@ -0,0 +1,79 @@
+/*
+       cbm.c (09.11.10)
+       Clusters Bitmap creation code.
+
+       Free exFAT implementation.
+       Copyright (C) 2011-2018  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 off_t cbm_alignment(void)
+{
+       return get_cluster_size();
+}
+
+static off_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,
+};