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| 3504 | jermar | 1 | /* |
| 2 | * Copyright (c) 2008 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | /** @addtogroup fs |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 33 | #ifndef FAT_FAT_FAT_H_ |
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| 34 | #define FAT_FAT_FAT_H_ |
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| 35 | |||
| 3506 | jermar | 36 | #include "../../vfs/vfs.h" |
| 37 | #include <stdint.h> |
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| 3571 | jermar | 38 | #include <libblock.h> |
| 3506 | jermar | 39 | |
| 40 | #define FAT1 0 |
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| 41 | |||
| 42 | #define FAT_CLST_RES0 0x0000 |
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| 43 | #define FAT_CLST_RES1 0x0001 |
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| 44 | #define FAT_CLST_FIRST 0x0002 |
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| 45 | #define FAT_CLST_BAD 0xfff7 |
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| 46 | #define FAT_CLST_LAST1 0xfff8 |
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| 47 | #define FAT_CLST_LAST8 0xffff |
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| 48 | |||
| 49 | /* internally used to mark root directory's parent */ |
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| 50 | #define FAT_CLST_ROOTPAR FAT_CLST_RES0 |
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| 51 | /* internally used to mark root directory */ |
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| 52 | #define FAT_CLST_ROOT FAT_CLST_RES1 |
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| 53 | |||
| 54 | /* forward declarations */ |
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| 55 | struct block; |
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| 56 | struct fat_node; |
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| 3516 | jermar | 57 | struct fat_bs; |
| 3506 | jermar | 58 | |
| 59 | typedef uint16_t fat_cluster_t; |
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| 60 | |||
| 3550 | jermar | 61 | #define fat_clusters_get(bs, dh, fc) \ |
| 3571 | jermar | 62 | fat_cluster_walk((bs), (dh), (fc), NULL, (uint16_t) -1) |
| 63 | extern uint16_t fat_cluster_walk(struct fat_bs *, dev_handle_t, fat_cluster_t, |
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| 64 | fat_cluster_t *, uint16_t); |
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| 3550 | jermar | 65 | |
| 3571 | jermar | 66 | #define fat_block_get(bs, np, bn) \ |
| 67 | _fat_block_get((bs), (np)->idx->dev_handle, (np)->firstc, (bn)) |
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| 68 | |||
| 3516 | jermar | 69 | extern struct block *_fat_block_get(struct fat_bs *, dev_handle_t, |
| 3571 | jermar | 70 | fat_cluster_t, bn_t); |
| 3506 | jermar | 71 | |
| 3516 | jermar | 72 | extern void fat_append_clusters(struct fat_bs *, struct fat_node *, |
| 3506 | jermar | 73 | fat_cluster_t); |
| 3572 | jermar | 74 | extern void fat_chop_clusters(struct fat_bs *, struct fat_node *, |
| 75 | fat_cluster_t); |
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| 3516 | jermar | 76 | extern int fat_alloc_clusters(struct fat_bs *, dev_handle_t, unsigned, |
| 77 | fat_cluster_t *, fat_cluster_t *); |
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| 3572 | jermar | 78 | extern void fat_free_clusters(struct fat_bs *, dev_handle_t, fat_cluster_t); |
| 3516 | jermar | 79 | extern void fat_alloc_shadow_clusters(struct fat_bs *, dev_handle_t, |
| 80 | fat_cluster_t *, unsigned); |
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| 3572 | jermar | 81 | extern fat_cluster_t fat_get_cluster(struct fat_bs *, dev_handle_t, fat_cluster_t); |
| 82 | extern void fat_set_cluster(struct fat_bs *, dev_handle_t, unsigned, |
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| 3516 | jermar | 83 | fat_cluster_t, fat_cluster_t); |
| 84 | extern void fat_fill_gap(struct fat_bs *, struct fat_node *, fat_cluster_t, |
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| 85 | off_t); |
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| 3506 | jermar | 86 | |
| 3504 | jermar | 87 | #endif |
| 88 | |||
| 89 | /** |
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| 90 | * @} |
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| 91 | */ |