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/*

 * Copyright (c) 2008 Jakub Jermar

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * - Redistributions of source code must retain the above copyright

 *   notice, this list of conditions and the following disclaimer.

 * - Redistributions in binary form must reproduce the above copyright

 *   notice, this list of conditions and the following disclaimer in the

 *   documentation and/or other materials provided with the distribution.

 * - The name of the author may not be used to endorse or promote products

 *   derived from this software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR

 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/** @addtogroup fs

 * @{

 */

#ifndef FAT_FAT_FAT_H_

#define FAT_FAT_FAT_H_

#include "../../vfs/vfs.h"

#include <stdint.h>

#define FAT1        0

#define FAT_CLST_RES0   0x0000

#define FAT_CLST_RES1   0x0001

#define FAT_CLST_FIRST  0x0002

#define FAT_CLST_BAD    0xfff7

#define FAT_CLST_LAST1  0xfff8

#define FAT_CLST_LAST8  0xffff

/* internally used to mark root directory's parent */

#define FAT_CLST_ROOTPAR    FAT_CLST_RES0

/* internally used to mark root directory */

#define FAT_CLST_ROOT       FAT_CLST_RES1

/* forward declarations */

struct block;

struct fat_node;

struct fat_bs;

typedef uint16_t fat_cluster_t;

#define fat_clusters_get(bs, dh, fc) \

    fat_cluster_walk((bs), (dh), (fc), NULL, NULL, (uint16_t) -1)

#define fat_block_get(bs, np, off) \

    _fat_block_get((bs), (np)->idx->dev_handle, (np)->firstc, (off))

extern struct block *_fat_block_get(struct fat_bs *, dev_handle_t,

    fat_cluster_t, off_t);

extern uint16_t fat_cluster_walk(struct fat_bs *, dev_handle_t, fat_cluster_t,

    fat_cluster_t *, fat_cluster_t *, uint16_t);

extern void fat_append_clusters(struct fat_bs *, struct fat_node *,

    fat_cluster_t);

extern int fat_alloc_clusters(struct fat_bs *, dev_handle_t, unsigned,

    fat_cluster_t *, fat_cluster_t *);

extern void fat_alloc_shadow_clusters(struct fat_bs *, dev_handle_t,

    fat_cluster_t *, unsigned);

extern void fat_mark_cluster(struct fat_bs *, dev_handle_t, unsigned,

    fat_cluster_t, fat_cluster_t);

extern void fat_fill_gap(struct fat_bs *, struct fat_node *, fat_cluster_t,

    off_t);

#endif

/**

 * @}

 */