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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 | /** |
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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 | |||
| 3505 | jermar | 38 | #include "fat_dentry.h" |
| 3504 | jermar | 39 | |
| 3505 | jermar | 40 | #define FAT_PAD ' ' |
| 41 | |||
| 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 | |||
| 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 | |||
| 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 | |||
| 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 | |||
| 3504 | jermar | 98 | /** |
| 99 | * @} |
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| 100 | */ |