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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. /**
  34.  * @file    fat_dentry.c
  35.  * @brief   Functions that work with FAT directory entries.
  36.  */
  37.  
  38. #include "fat_dentry.h"
  39.  
  40. #define FAT_PAD         ' '
  41.  
  42. #define FAT_DENTRY_UNUSED   0x00
  43. #define FAT_DENTRY_E5_ESC   0x05
  44. #define FAT_DENTRY_DOT      0x2e
  45. #define FAT_DENTRY_ERASED   0xe5
  46.  
  47. void dentry_name_canonify(fat_dentry_t *d, char *buf)
  48. {
  49.     int i;
  50.  
  51.     for (i = 0; i < FAT_NAME_LEN; i++) {
  52.         if (d->name[i] == FAT_PAD)
  53.             break;
  54.         if (d->name[i] == FAT_DENTRY_E5_ESC)
  55.             *buf++ = 0xe5;
  56.         else
  57.             *buf++ = d->name[i];
  58.     }
  59.     if (d->ext[0] != FAT_PAD)
  60.         *buf++ = '.';
  61.     for (i = 0; i < FAT_EXT_LEN; i++) {
  62.         if (d->ext[i] == FAT_PAD) {
  63.             *buf = '\0';
  64.             return;
  65.         }
  66.         if (d->ext[i] == FAT_DENTRY_E5_ESC)
  67.             *buf++ = 0xe5;
  68.         else
  69.             *buf++ = d->ext[i];
  70.     }
  71.     *buf = '\0';
  72. }
  73.  
  74. fat_dentry_clsf_t fat_classify_dentry(fat_dentry_t *d)
  75. {
  76.     if (d->attr & FAT_ATTR_VOLLABEL) {
  77.         /* volume label entry */
  78.         return FAT_DENTRY_SKIP;
  79.     }
  80.     if (d->name[0] == FAT_DENTRY_ERASED) {
  81.         /* not-currently-used entry */
  82.         return FAT_DENTRY_SKIP;
  83.     }
  84.     if (d->name[0] == FAT_DENTRY_UNUSED) {
  85.         /* never used entry */
  86.         return FAT_DENTRY_LAST;
  87.     }
  88.     if (d->name[0] == FAT_DENTRY_DOT) {
  89.         /*
  90.          * Most likely '.' or '..'.
  91.          * It cannot occur in a regular file name.
  92.          */
  93.         return FAT_DENTRY_SKIP;
  94.     }
  95.     return FAT_DENTRY_VALID;
  96. }
  97.  
  98. /**
  99.  * @}
  100.  */
  101.