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