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3504 jermar 1
/*
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 * Copyright (c) 2008 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup fs
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 * @{
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 */
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#ifndef FAT_FAT_FAT_H_
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#define FAT_FAT_FAT_H_
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#include "../../vfs/vfs.h"
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#include <stdint.h>
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#include <libblock.h>
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#define FAT1        0
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#define FAT_CLST_RES0   0x0000
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#define FAT_CLST_RES1   0x0001
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#define FAT_CLST_FIRST  0x0002
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#define FAT_CLST_BAD    0xfff7
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#define FAT_CLST_LAST1  0xfff8
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#define FAT_CLST_LAST8  0xffff
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/* internally used to mark root directory's parent */
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#define FAT_CLST_ROOTPAR    FAT_CLST_RES0
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/* internally used to mark root directory */
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#define FAT_CLST_ROOT       FAT_CLST_RES1
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/* forward declarations */
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struct block;
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struct fat_node;
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struct fat_bs;
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typedef uint16_t fat_cluster_t;
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#define fat_clusters_get(bs, dh, fc) \
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    fat_cluster_walk((bs), (dh), (fc), NULL, (uint16_t) -1)
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extern uint16_t fat_cluster_walk(struct fat_bs *, dev_handle_t, fat_cluster_t,
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    fat_cluster_t *, uint16_t);
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#define fat_block_get(bs, np, bn) \
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    _fat_block_get((bs), (np)->idx->dev_handle, (np)->firstc, (bn))
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extern struct block *_fat_block_get(struct fat_bs *, dev_handle_t,
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    fat_cluster_t, bn_t);
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extern void fat_append_clusters(struct fat_bs *, struct fat_node *,
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    fat_cluster_t);
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extern void fat_chop_clusters(struct fat_bs *, struct fat_node *,
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    fat_cluster_t);
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extern int fat_alloc_clusters(struct fat_bs *, dev_handle_t, unsigned,
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    fat_cluster_t *, fat_cluster_t *);
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extern void fat_free_clusters(struct fat_bs *, dev_handle_t, fat_cluster_t);
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extern void fat_alloc_shadow_clusters(struct fat_bs *, dev_handle_t,
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    fat_cluster_t *, unsigned);
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extern fat_cluster_t fat_get_cluster(struct fat_bs *, dev_handle_t, fat_cluster_t);
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extern void fat_set_cluster(struct fat_bs *, dev_handle_t, unsigned,
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    fat_cluster_t, fat_cluster_t);
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extern void fat_fill_gap(struct fat_bs *, struct fat_node *, fat_cluster_t,
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    off_t);
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#endif
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/**
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 * @}
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 */