Subversion Repositories HelenOS

Rev

Rev 3504 | Rev 3628 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
3504 jermar 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
 
3505 jermar 38
#include "fat_dentry.h"
3504 jermar 39
 
3505 jermar 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
 
3504 jermar 98
/**
99
 * @}
100
 */