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| Rev | Author | Line No. | Line |
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| 2627 | jermar | 1 | /* |
| 2793 | jermar | 2 | * Copyright (c) 2008 Jakub Jermar |
| 2627 | jermar | 3 | * All rights reserved. |
| 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_ops.c |
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| 35 | * @brief Implementation of VFS operations for the FAT file system server. |
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| 36 | */ |
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| 37 | |||
| 38 | #include "fat.h" |
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| 2638 | jermar | 39 | #include "../../vfs/vfs.h" |
| 2793 | jermar | 40 | #include <libfs.h> |
| 2627 | jermar | 41 | #include <ipc/ipc.h> |
| 42 | #include <async.h> |
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| 43 | #include <errno.h> |
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| 2793 | jermar | 44 | #include <string.h> |
| 2627 | jermar | 45 | |
| 2638 | jermar | 46 | #define FAT_NAME_LEN 8 |
| 47 | #define FAT_EXT_LEN 3 |
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| 48 | |||
| 49 | #define FAT_PAD ' ' |
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| 50 | |||
| 51 | #define FAT_DENTRY_UNUSED 0x00 |
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| 52 | #define FAT_DENTRY_E5_ESC 0x05 |
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| 53 | #define FAT_DENTRY_DOT 0x2e |
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| 54 | #define FAT_DENTRY_ERASED 0xe5 |
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| 55 | |||
| 2793 | jermar | 56 | static void dentry_name_canonify(fat_dentry_t *d, char *buf) |
| 2638 | jermar | 57 | { |
| 2793 | jermar | 58 | int i; |
| 2639 | jermar | 59 | |
| 2793 | jermar | 60 | for (i = 0; i < FAT_NAME_LEN; i++) { |
| 61 | if (d->name[i] == FAT_PAD) { |
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| 62 | buf++; |
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| 63 | break; |
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| 2639 | jermar | 64 | } |
| 2793 | jermar | 65 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
| 66 | *buf++ = 0xe5; |
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| 67 | else |
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| 68 | *buf++ = d->name[i]; |
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| 69 | } |
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| 70 | if (d->ext[0] != FAT_PAD) |
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| 71 | *buf++ = '.'; |
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| 72 | for (i = 0; i < FAT_EXT_LEN; i++) { |
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| 73 | if (d->ext[i] == FAT_PAD) { |
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| 74 | *buf = '\0'; |
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| 75 | return; |
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| 76 | } |
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| 77 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
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| 78 | *buf++ = 0xe5; |
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| 79 | else |
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| 80 | *buf++ = d->ext[i]; |
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| 81 | } |
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| 82 | } |
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| 83 | |||
| 84 | static fat_dentry_t *fat_dentry_get(fat_node_t *dirnode, unsigned idx) |
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| 85 | { |
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| 86 | return NULL; /* TODO */ |
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| 87 | } |
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| 88 | |||
| 89 | static void fat_dentry_put(fat_dentry_t *dentry) |
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| 90 | { |
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| 91 | /* TODO */ |
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| 92 | } |
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| 93 | |||
| 94 | static void *fat_node_get(dev_handle_t dev_handle, fs_index_t index) |
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| 95 | { |
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| 96 | return NULL; /* TODO */ |
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| 97 | } |
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| 98 | |||
| 99 | static void *fat_match(void *prnt, const char *component) |
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| 100 | { |
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| 101 | fat_node_t *parentp = (fat_node_t *)prnt; |
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| 102 | char name[FAT_NAME_LEN + 1 + FAT_EXT_LEN + 1]; |
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| 103 | unsigned i; |
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| 104 | unsigned dentries; |
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| 105 | fat_dentry_t *d; |
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| 106 | |||
| 107 | dentries = parentp->size / sizeof(fat_dentry_t); |
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| 108 | for (i = 0; i < dentries; i++) { |
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| 109 | d = fat_dentry_get(parentp, i); |
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| 110 | if (d->attr & FAT_ATTR_VOLLABEL) { |
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| 111 | /* volume label entry */ |
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| 112 | fat_dentry_put(d); |
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| 2639 | jermar | 113 | continue; |
| 114 | } |
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| 2793 | jermar | 115 | if (d->name[0] == FAT_DENTRY_ERASED) { |
| 116 | /* not-currently-used entry */ |
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| 117 | fat_dentry_put(d); |
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| 118 | continue; |
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| 2639 | jermar | 119 | } |
| 2793 | jermar | 120 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
| 121 | /* never used entry */ |
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| 122 | fat_dentry_put(d); |
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| 123 | break; |
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| 124 | } |
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| 125 | if (d->name[0] == FAT_DENTRY_DOT) { |
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| 126 | /* |
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| 127 | * Most likely '.' or '..'. |
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| 128 | * It cannot occur in a regular file name. |
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| 129 | */ |
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| 130 | fat_dentry_put(d); |
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| 131 | continue; |
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| 132 | } |
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| 133 | |||
| 134 | dentry_name_canonify(d, name); |
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| 135 | if (strcmp(name, component) == 0) { |
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| 136 | /* hit */ |
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| 137 | void *node = fat_node_get(parentp->dev_handle, |
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| 138 | (fs_index_t)d->firstc); |
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| 139 | fat_dentry_put(d); |
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| 140 | return node; |
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| 141 | |||
| 142 | } else { |
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| 143 | /* miss */ |
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| 144 | fat_dentry_put(d); |
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| 145 | } |
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| 2639 | jermar | 146 | } |
| 2793 | jermar | 147 | |
| 148 | return NULL; |
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| 2638 | jermar | 149 | } |
| 150 | |||
| 2793 | jermar | 151 | /** libfs operations */ |
| 152 | libfs_ops_t fat_libfs_ops = { |
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| 153 | .match = fat_match, |
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| 154 | .node_get = fat_node_get, |
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| 155 | .create = NULL, |
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| 156 | .destroy = NULL, |
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| 157 | .link = NULL, |
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| 158 | .unlink = NULL, |
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| 159 | .index_get = NULL, |
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| 160 | .size_get = NULL, |
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| 161 | .lnkcnt_get = NULL, |
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| 162 | .has_children = NULL, |
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| 163 | .root_get = NULL, |
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| 164 | .plb_get_char = NULL, |
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| 165 | .is_directory = NULL, |
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| 166 | .is_file = NULL |
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| 167 | }; |
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| 168 | |||
| 2627 | jermar | 169 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
| 170 | { |
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| 2793 | jermar | 171 | libfs_lookup(&fat_libfs_ops, fat_reg.fs_handle, rid, request); |
| 2627 | jermar | 172 | } |
| 173 | |||
| 174 | /** |
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| 175 | * @} |
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| 176 | */ |