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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> |
| 2798 | jermar | 45 | #include <byteorder.h> |
| 2627 | jermar | 46 | |
| 2638 | jermar | 47 | #define FAT_NAME_LEN 8 |
| 48 | #define FAT_EXT_LEN 3 |
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| 49 | |||
| 50 | #define FAT_PAD ' ' |
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| 51 | |||
| 52 | #define FAT_DENTRY_UNUSED 0x00 |
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| 53 | #define FAT_DENTRY_E5_ESC 0x05 |
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| 54 | #define FAT_DENTRY_DOT 0x2e |
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| 55 | #define FAT_DENTRY_ERASED 0xe5 |
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| 56 | |||
| 2793 | jermar | 57 | static void dentry_name_canonify(fat_dentry_t *d, char *buf) |
| 2638 | jermar | 58 | { |
| 2793 | jermar | 59 | int i; |
| 2639 | jermar | 60 | |
| 2793 | jermar | 61 | for (i = 0; i < FAT_NAME_LEN; i++) { |
| 62 | if (d->name[i] == FAT_PAD) { |
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| 63 | buf++; |
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| 64 | break; |
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| 2639 | jermar | 65 | } |
| 2793 | jermar | 66 | if (d->name[i] == FAT_DENTRY_E5_ESC) |
| 67 | *buf++ = 0xe5; |
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| 68 | else |
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| 69 | *buf++ = d->name[i]; |
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| 70 | } |
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| 71 | if (d->ext[0] != FAT_PAD) |
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| 72 | *buf++ = '.'; |
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| 73 | for (i = 0; i < FAT_EXT_LEN; i++) { |
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| 74 | if (d->ext[i] == FAT_PAD) { |
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| 75 | *buf = '\0'; |
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| 76 | return; |
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| 77 | } |
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| 78 | if (d->ext[i] == FAT_DENTRY_E5_ESC) |
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| 79 | *buf++ = 0xe5; |
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| 80 | else |
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| 81 | *buf++ = d->ext[i]; |
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| 82 | } |
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| 83 | } |
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| 84 | |||
| 85 | static fat_dentry_t *fat_dentry_get(fat_node_t *dirnode, unsigned idx) |
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| 86 | { |
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| 87 | return NULL; /* TODO */ |
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| 88 | } |
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| 89 | |||
| 90 | static void fat_dentry_put(fat_dentry_t *dentry) |
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| 91 | { |
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| 92 | /* TODO */ |
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| 93 | } |
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| 94 | |||
| 95 | static void *fat_node_get(dev_handle_t dev_handle, fs_index_t index) |
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| 96 | { |
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| 97 | return NULL; /* TODO */ |
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| 98 | } |
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| 99 | |||
| 100 | static void *fat_match(void *prnt, const char *component) |
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| 101 | { |
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| 102 | fat_node_t *parentp = (fat_node_t *)prnt; |
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| 103 | char name[FAT_NAME_LEN + 1 + FAT_EXT_LEN + 1]; |
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| 104 | unsigned i; |
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| 105 | unsigned dentries; |
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| 106 | fat_dentry_t *d; |
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| 107 | |||
| 108 | dentries = parentp->size / sizeof(fat_dentry_t); |
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| 109 | for (i = 0; i < dentries; i++) { |
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| 110 | d = fat_dentry_get(parentp, i); |
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| 111 | if (d->attr & FAT_ATTR_VOLLABEL) { |
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| 112 | /* volume label entry */ |
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| 113 | fat_dentry_put(d); |
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| 2639 | jermar | 114 | continue; |
| 115 | } |
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| 2793 | jermar | 116 | if (d->name[0] == FAT_DENTRY_ERASED) { |
| 117 | /* not-currently-used entry */ |
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| 118 | fat_dentry_put(d); |
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| 119 | continue; |
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| 2639 | jermar | 120 | } |
| 2793 | jermar | 121 | if (d->name[0] == FAT_DENTRY_UNUSED) { |
| 122 | /* never used entry */ |
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| 123 | fat_dentry_put(d); |
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| 124 | break; |
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| 125 | } |
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| 126 | if (d->name[0] == FAT_DENTRY_DOT) { |
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| 127 | /* |
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| 128 | * Most likely '.' or '..'. |
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| 129 | * It cannot occur in a regular file name. |
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| 130 | */ |
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| 131 | fat_dentry_put(d); |
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| 132 | continue; |
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| 133 | } |
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| 134 | |||
| 135 | dentry_name_canonify(d, name); |
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| 136 | if (strcmp(name, component) == 0) { |
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| 137 | /* hit */ |
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| 138 | void *node = fat_node_get(parentp->dev_handle, |
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| 2796 | jermar | 139 | (fs_index_t)uint16_t_le2host(d->firstc)); |
| 2793 | jermar | 140 | fat_dentry_put(d); |
| 141 | return node; |
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| 142 | |||
| 143 | } else { |
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| 144 | /* miss */ |
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| 145 | fat_dentry_put(d); |
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| 146 | } |
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| 2639 | jermar | 147 | } |
| 2793 | jermar | 148 | |
| 149 | return NULL; |
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| 2638 | jermar | 150 | } |
| 151 | |||
| 2793 | jermar | 152 | /** libfs operations */ |
| 153 | libfs_ops_t fat_libfs_ops = { |
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| 154 | .match = fat_match, |
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| 155 | .node_get = fat_node_get, |
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| 156 | .create = NULL, |
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| 157 | .destroy = NULL, |
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| 158 | .link = NULL, |
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| 159 | .unlink = NULL, |
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| 160 | .index_get = NULL, |
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| 161 | .size_get = NULL, |
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| 162 | .lnkcnt_get = NULL, |
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| 163 | .has_children = NULL, |
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| 164 | .root_get = NULL, |
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| 165 | .plb_get_char = NULL, |
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| 166 | .is_directory = NULL, |
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| 167 | .is_file = NULL |
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| 168 | }; |
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| 169 | |||
| 2627 | jermar | 170 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
| 171 | { |
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| 2793 | jermar | 172 | libfs_lookup(&fat_libfs_ops, fat_reg.fs_handle, rid, request); |
| 2627 | jermar | 173 | } |
| 174 | |||
| 175 | /** |
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| 176 | * @} |
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| 177 | */ |