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