1 | /*
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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 |
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29 | /** @addtogroup fs
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30 | * @{
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31 | */
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32 |
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33 | #ifndef FAT_FAT_FAT_H_
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34 | #define FAT_FAT_FAT_H_
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35 |
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36 | #include "../../vfs/vfs.h"
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37 | #include <stdint.h>
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38 | #include <libblock.h>
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39 |
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40 | #define FAT1 0
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41 |
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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 |
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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 |
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54 | /* forward declarations */
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55 | struct block;
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56 | struct fat_node;
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57 | struct fat_bs;
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58 |
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59 | typedef uint16_t fat_cluster_t;
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60 |
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61 | #define fat_clusters_get(numc, bs, dh, fc) \
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62 | fat_cluster_walk((bs), (dh), (fc), NULL, (numc), (uint16_t) -1)
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63 | extern int fat_cluster_walk(struct fat_bs *, dev_handle_t, fat_cluster_t,
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64 | fat_cluster_t *, uint16_t *, uint16_t);
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65 |
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66 | #define fat_block_get(b, bs, np, bn, flags) \
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67 | _fat_block_get((b), (bs), (np)->idx->dev_handle, (np)->firstc, (bn), \
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68 | (flags))
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69 |
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70 | extern int _fat_block_get(block_t **, struct fat_bs *, dev_handle_t,
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71 | fat_cluster_t, bn_t, int);
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72 |
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73 | extern int fat_append_clusters(struct fat_bs *, struct fat_node *,
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74 | fat_cluster_t);
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75 | extern int fat_chop_clusters(struct fat_bs *, struct fat_node *,
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76 | fat_cluster_t);
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77 | extern int fat_alloc_clusters(struct fat_bs *, dev_handle_t, unsigned,
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78 | fat_cluster_t *, fat_cluster_t *);
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79 | extern int fat_free_clusters(struct fat_bs *, dev_handle_t, fat_cluster_t);
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80 | extern int fat_alloc_shadow_clusters(struct fat_bs *, dev_handle_t,
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81 | fat_cluster_t *, unsigned);
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82 | extern int fat_get_cluster(struct fat_bs *, dev_handle_t, unsigned,
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83 | fat_cluster_t, fat_cluster_t *);
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84 | extern int fat_set_cluster(struct fat_bs *, dev_handle_t, unsigned,
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85 | fat_cluster_t, fat_cluster_t);
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86 | extern int fat_fill_gap(struct fat_bs *, struct fat_node *, fat_cluster_t,
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87 | off_t);
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88 | extern int fat_zero_cluster(struct fat_bs *, dev_handle_t, fat_cluster_t);
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89 |
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90 | #endif
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91 |
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92 | /**
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93 | * @}
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94 | */
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