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75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
/*
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cbm.c (09.11.10)
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Clusters Bitmap creation code.
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Copyright (C) 2011-2013 Andrew Nayenko
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <limits.h>
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#include "cbm.h"
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#include "fat.h"
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#include "uct.h"
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#include "rootdir.h"
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static off64_t cbm_alignment(void)
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{
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return get_cluster_size();
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}
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static off64_t cbm_size(void)
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{
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return DIV_ROUND_UP(
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(get_volume_size() - get_position(&cbm)) / get_cluster_size(),
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CHAR_BIT);
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}
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static int cbm_write(struct exfat_dev* dev)
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{
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uint32_t allocated_clusters =
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DIV_ROUND_UP(cbm.get_size(), get_cluster_size()) +
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DIV_ROUND_UP(uct.get_size(), get_cluster_size()) +
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DIV_ROUND_UP(rootdir.get_size(), get_cluster_size());
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size_t bitmap_size = DIV_ROUND_UP(allocated_clusters, CHAR_BIT);
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uint8_t* bitmap = malloc(bitmap_size);
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size_t i;
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if (bitmap == NULL)
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{
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exfat_error("failed to allocate bitmap of %zu bytes", bitmap_size);
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return 1;
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}
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for (i = 0; i < bitmap_size * CHAR_BIT; i++)
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if (i < allocated_clusters)
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BMAP_SET(bitmap, i);
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else
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BMAP_CLR(bitmap, i);
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if (exfat_write(dev, bitmap, bitmap_size) < 0)
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{
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exfat_error("failed to write bitmap of %zu bytes", bitmap_size);
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return 1;
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}
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free(bitmap);
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return 0;
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}
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const struct fs_object cbm =
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{
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.get_alignment = cbm_alignment,
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.get_size = cbm_size,
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.write = cbm_write,
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};
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