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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" |
| 3628 | jermar | 39 | #include <ctype.h> |
| 3634 | jermar | 40 | #include <string.h> |
| 3504 | jermar | 41 | |
| 3505 | jermar | 42 | #define FAT_PAD ' ' |
| 43 | |||
| 44 | #define FAT_DENTRY_UNUSED 0x00 |
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| 45 | #define FAT_DENTRY_E5_ESC 0x05 |
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| 46 | #define FAT_DENTRY_DOT 0x2e |
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| 47 | #define FAT_DENTRY_ERASED 0xe5 |
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| 48 | |||
| 3628 | jermar | 49 | static bool is_d_char(const char ch) |
| 3505 | jermar | 50 | { |
| 3628 | jermar | 51 | if (isalnum(ch) || ch == '_') |
| 52 | return true; |
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| 53 | else |
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| 54 | return false; |
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| 55 | } |
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| 56 | |||
| 3634 | jermar | 57 | /** Compare path component with the name read from the dentry. |
| 58 | * |
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| 59 | * This function compares the path component with the name read from the dentry. |
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| 60 | * The comparison is case insensitive and tolerates a mismatch on the trailing |
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| 61 | * dot character at the end of the name (i.e. when there is a dot, but no |
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| 62 | * extension). |
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| 63 | * |
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| 64 | * @param name Node name read from the dentry. |
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| 65 | * @param component Path component. |
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| 66 | * |
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| 67 | * @return Zero on match, non-zero otherwise. |
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| 68 | */ |
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| 69 | int fat_dentry_namecmp(char *name, const char *component) |
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| 70 | { |
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| 71 | int rc; |
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| 72 | if (!(rc = stricmp(name, component))) |
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| 73 | return rc; |
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| 74 | if (!strchr(name, '.')) { |
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| 75 | /* |
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| 76 | * There is no '.' in the name, so we know that there is enough |
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| 77 | * space for appending an extra '.' to name. |
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| 78 | */ |
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| 79 | name[strlen(name)] = '.'; |
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| 80 | name[strlen(name) + 1] = '\0'; |
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| 81 | rc = stricmp(name, component); |
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| 82 | } |
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| 83 | return rc; |
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| 84 | } |
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| 85 | |||
| 3628 | jermar | 86 | bool fat_dentry_name_verify(const char *name) |
| 87 | { |
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| 88 | unsigned i, dot; |
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| 89 | bool dot_found = false; |
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| 90 | |||
| 91 | |||
| 92 | for (i = 0; name[i]; i++) { |
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| 93 | if (name[i] == '.') { |
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| 94 | if (dot_found) { |
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| 95 | return false; |
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| 96 | } else { |
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| 97 | dot_found = true; |
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| 98 | dot = i; |
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| 99 | } |
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| 100 | } else { |
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| 101 | if (!is_d_char(name[i])) |
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| 102 | return false; |
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| 103 | } |
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| 104 | } |
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| 105 | |||
| 106 | if (dot_found) { |
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| 107 | if (dot > FAT_NAME_LEN) |
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| 108 | return false; |
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| 109 | if (i - dot > FAT_EXT_LEN + 1) |
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| 110 | return false; |
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| 111 | } else { |
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| 112 | if (i > FAT_NAME_LEN) |
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| 113 | return false; |
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| 114 | } |
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| 115 | |||
| 116 | return true; |
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| 117 | } |
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| 118 | |||
| 119 | void fat_dentry_name_get(const fat_dentry_t *d, char *buf) |
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| 120 | { |
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| 3505 | jermar | 121 | int i; |
| 122 | |||
| 123 | for (i = 0; i < FAT_NAME_LEN; i++) { |
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| 124 | if (d->name[i] == FAT_PAD) |
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| 125 | break; |
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| 126 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
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| 127 | *buf++ = 0xe5; |
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| 128 | else |
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| 129 | *buf++ = d->name[i]; |
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| 130 | } |
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| 131 | if (d->ext[0] != FAT_PAD) |
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| 132 | *buf++ = '.'; |
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| 133 | for (i = 0; i < FAT_EXT_LEN; i++) { |
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| 134 | if (d->ext[i] == FAT_PAD) { |
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| 135 | *buf = '\0'; |
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| 136 | return; |
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| 137 | } |
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| 138 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
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| 139 | *buf++ = 0xe5; |
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| 140 | else |
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| 141 | *buf++ = d->ext[i]; |
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| 142 | } |
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| 143 | *buf = '\0'; |
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| 144 | } |
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| 145 | |||
| 3628 | jermar | 146 | void fat_dentry_name_set(fat_dentry_t *d, const char *name) |
| 3505 | jermar | 147 | { |
| 3628 | jermar | 148 | int i; |
| 149 | const char fake_ext[] = " "; |
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| 150 | |||
| 151 | |||
| 152 | for (i = 0; i < FAT_NAME_LEN; i++) { |
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| 153 | switch ((uint8_t) *name) { |
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| 154 | case 0xe5: |
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| 155 | d->name[i] = FAT_DENTRY_E5_ESC; |
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| 156 | name++; |
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| 157 | break; |
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| 158 | case '\0': |
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| 159 | case '.': |
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| 160 | d->name[i] = FAT_PAD; |
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| 161 | break; |
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| 162 | default: |
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| 163 | d->name[i] = toupper(*name++); |
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| 164 | break; |
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| 165 | } |
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| 166 | } |
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| 167 | if (*name++ != '.') |
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| 168 | name = fake_ext; |
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| 169 | for (i = 0; i < FAT_EXT_LEN; i++) { |
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| 170 | switch ((uint8_t) *name) { |
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| 171 | case 0xe5: |
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| 172 | d->ext[i] = FAT_DENTRY_E5_ESC; |
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| 173 | name++; |
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| 174 | break; |
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| 175 | case '\0': |
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| 176 | d->ext[i] = FAT_PAD; |
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| 177 | break; |
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| 178 | default: |
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| 179 | d->ext[i] = toupper(*name++); |
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| 180 | break; |
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| 181 | } |
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| 182 | } |
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| 183 | } |
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| 184 | |||
| 185 | fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *d) |
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| 186 | { |
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| 3505 | jermar | 187 | if (d->attr & FAT_ATTR_VOLLABEL) { |
| 188 | /* volume label entry */ |
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| 189 | return FAT_DENTRY_SKIP; |
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| 190 | } |
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| 191 | if (d->name[0] == FAT_DENTRY_ERASED) { |
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| 192 | /* not-currently-used entry */ |
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| 3628 | jermar | 193 | return FAT_DENTRY_FREE; |
| 3505 | jermar | 194 | } |
| 195 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
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| 196 | /* never used entry */ |
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| 197 | return FAT_DENTRY_LAST; |
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| 198 | } |
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| 199 | if (d->name[0] == FAT_DENTRY_DOT) { |
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| 200 | /* |
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| 201 | * Most likely '.' or '..'. |
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| 202 | * It cannot occur in a regular file name. |
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| 203 | */ |
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| 204 | return FAT_DENTRY_SKIP; |
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| 205 | } |
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| 206 | return FAT_DENTRY_VALID; |
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| 207 | } |
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| 208 | |||
| 3504 | jermar | 209 | /** |
| 210 | * @} |
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| 211 | */ |