Rev 3634 | Rev 4264 | 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" |
| 3628 | jermar | 39 | #include <ctype.h> |
| 3634 | jermar | 40 | #include <string.h> |
| 3504 | jermar | 41 | |
| 3628 | jermar | 42 | static bool is_d_char(const char ch) |
| 3505 | jermar | 43 | { |
| 3628 | jermar | 44 | if (isalnum(ch) || ch == '_') |
| 45 | return true; |
||
| 46 | else |
||
| 47 | return false; |
||
| 48 | } |
||
| 49 | |||
| 3634 | jermar | 50 | /** Compare path component with the name read from the dentry. |
| 51 | * |
||
| 52 | * This function compares the path component with the name read from the dentry. |
||
| 53 | * The comparison is case insensitive and tolerates a mismatch on the trailing |
||
| 54 | * dot character at the end of the name (i.e. when there is a dot, but no |
||
| 55 | * extension). |
||
| 56 | * |
||
| 57 | * @param name Node name read from the dentry. |
||
| 58 | * @param component Path component. |
||
| 59 | * |
||
| 60 | * @return Zero on match, non-zero otherwise. |
||
| 61 | */ |
||
| 62 | int fat_dentry_namecmp(char *name, const char *component) |
||
| 63 | { |
||
| 64 | int rc; |
||
| 65 | if (!(rc = stricmp(name, component))) |
||
| 66 | return rc; |
||
| 67 | if (!strchr(name, '.')) { |
||
| 68 | /* |
||
| 69 | * There is no '.' in the name, so we know that there is enough |
||
| 70 | * space for appending an extra '.' to name. |
||
| 71 | */ |
||
| 72 | name[strlen(name)] = '.'; |
||
| 73 | name[strlen(name) + 1] = '\0'; |
||
| 74 | rc = stricmp(name, component); |
||
| 75 | } |
||
| 76 | return rc; |
||
| 77 | } |
||
| 78 | |||
| 3628 | jermar | 79 | bool fat_dentry_name_verify(const char *name) |
| 80 | { |
||
| 81 | unsigned i, dot; |
||
| 82 | bool dot_found = false; |
||
| 83 | |||
| 84 | |||
| 85 | for (i = 0; name[i]; i++) { |
||
| 86 | if (name[i] == '.') { |
||
| 87 | if (dot_found) { |
||
| 88 | return false; |
||
| 89 | } else { |
||
| 90 | dot_found = true; |
||
| 91 | dot = i; |
||
| 92 | } |
||
| 93 | } else { |
||
| 94 | if (!is_d_char(name[i])) |
||
| 95 | return false; |
||
| 96 | } |
||
| 97 | } |
||
| 98 | |||
| 99 | if (dot_found) { |
||
| 100 | if (dot > FAT_NAME_LEN) |
||
| 101 | return false; |
||
| 102 | if (i - dot > FAT_EXT_LEN + 1) |
||
| 103 | return false; |
||
| 104 | } else { |
||
| 105 | if (i > FAT_NAME_LEN) |
||
| 106 | return false; |
||
| 107 | } |
||
| 108 | |||
| 109 | return true; |
||
| 110 | } |
||
| 111 | |||
| 112 | void fat_dentry_name_get(const fat_dentry_t *d, char *buf) |
||
| 113 | { |
||
| 3505 | jermar | 114 | int i; |
| 115 | |||
| 116 | for (i = 0; i < FAT_NAME_LEN; i++) { |
||
| 117 | if (d->name[i] == FAT_PAD) |
||
| 118 | break; |
||
| 119 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
||
| 120 | *buf++ = 0xe5; |
||
| 121 | else |
||
| 122 | *buf++ = d->name[i]; |
||
| 123 | } |
||
| 124 | if (d->ext[0] != FAT_PAD) |
||
| 125 | *buf++ = '.'; |
||
| 126 | for (i = 0; i < FAT_EXT_LEN; i++) { |
||
| 127 | if (d->ext[i] == FAT_PAD) { |
||
| 128 | *buf = '\0'; |
||
| 129 | return; |
||
| 130 | } |
||
| 131 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
||
| 132 | *buf++ = 0xe5; |
||
| 133 | else |
||
| 134 | *buf++ = d->ext[i]; |
||
| 135 | } |
||
| 136 | *buf = '\0'; |
||
| 137 | } |
||
| 138 | |||
| 3628 | jermar | 139 | void fat_dentry_name_set(fat_dentry_t *d, const char *name) |
| 3505 | jermar | 140 | { |
| 3628 | jermar | 141 | int i; |
| 142 | const char fake_ext[] = " "; |
||
| 143 | |||
| 144 | |||
| 145 | for (i = 0; i < FAT_NAME_LEN; i++) { |
||
| 146 | switch ((uint8_t) *name) { |
||
| 147 | case 0xe5: |
||
| 148 | d->name[i] = FAT_DENTRY_E5_ESC; |
||
| 149 | name++; |
||
| 150 | break; |
||
| 151 | case '\0': |
||
| 152 | case '.': |
||
| 153 | d->name[i] = FAT_PAD; |
||
| 154 | break; |
||
| 155 | default: |
||
| 156 | d->name[i] = toupper(*name++); |
||
| 157 | break; |
||
| 158 | } |
||
| 159 | } |
||
| 160 | if (*name++ != '.') |
||
| 161 | name = fake_ext; |
||
| 162 | for (i = 0; i < FAT_EXT_LEN; i++) { |
||
| 163 | switch ((uint8_t) *name) { |
||
| 164 | case 0xe5: |
||
| 165 | d->ext[i] = FAT_DENTRY_E5_ESC; |
||
| 166 | name++; |
||
| 167 | break; |
||
| 168 | case '\0': |
||
| 169 | d->ext[i] = FAT_PAD; |
||
| 170 | break; |
||
| 171 | default: |
||
| 172 | d->ext[i] = toupper(*name++); |
||
| 173 | break; |
||
| 174 | } |
||
| 175 | } |
||
| 176 | } |
||
| 177 | |||
| 178 | fat_dentry_clsf_t fat_classify_dentry(const fat_dentry_t *d) |
||
| 179 | { |
||
| 3505 | jermar | 180 | if (d->attr & FAT_ATTR_VOLLABEL) { |
| 181 | /* volume label entry */ |
||
| 182 | return FAT_DENTRY_SKIP; |
||
| 183 | } |
||
| 184 | if (d->name[0] == FAT_DENTRY_ERASED) { |
||
| 185 | /* not-currently-used entry */ |
||
| 3628 | jermar | 186 | return FAT_DENTRY_FREE; |
| 3505 | jermar | 187 | } |
| 188 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
||
| 189 | /* never used entry */ |
||
| 190 | return FAT_DENTRY_LAST; |
||
| 191 | } |
||
| 192 | if (d->name[0] == FAT_DENTRY_DOT) { |
||
| 193 | /* |
||
| 194 | * Most likely '.' or '..'. |
||
| 195 | * It cannot occur in a regular file name. |
||
| 196 | */ |
||
| 197 | return FAT_DENTRY_SKIP; |
||
| 198 | } |
||
| 199 | return FAT_DENTRY_VALID; |
||
| 200 | } |
||
| 201 | |||
| 3504 | jermar | 202 | /** |
| 203 | * @} |
||
| 204 | */ |