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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 | */ |