Rev 2638 | Rev 2643 | Go to most recent revision | Only display areas with differences | Ignore whitespace | Details | Blame | Last modification | View Log | RSS feed
Rev 2638 | Rev 2639 | ||
---|---|---|---|
1 | /* |
1 | /* |
2 | * Copyright (c) 2007 Jakub Jermar |
2 | * Copyright (c) 2007 Jakub Jermar |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
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 |
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. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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 |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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 |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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 |
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. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | */ |
27 | */ |
28 | 28 | ||
29 | /** @addtogroup fs |
29 | /** @addtogroup fs |
30 | * @{ |
30 | * @{ |
31 | */ |
31 | */ |
32 | 32 | ||
33 | /** |
33 | /** |
34 | * @file fat_ops.c |
34 | * @file fat_ops.c |
35 | * @brief Implementation of VFS operations for the FAT file system server. |
35 | * @brief Implementation of VFS operations for the FAT file system server. |
36 | */ |
36 | */ |
37 | 37 | ||
38 | #include "fat.h" |
38 | #include "fat.h" |
39 | #include "../../vfs/vfs.h" |
39 | #include "../../vfs/vfs.h" |
40 | #include <ipc/ipc.h> |
40 | #include <ipc/ipc.h> |
41 | #include <async.h> |
41 | #include <async.h> |
42 | #include <errno.h> |
42 | #include <errno.h> |
43 | 43 | ||
44 | #define PLB_GET_CHAR(i) (plb_ro[(i) % PLB_SIZE]) |
44 | #define PLB_GET_CHAR(i) (plb_ro[(i) % PLB_SIZE]) |
45 | 45 | ||
46 | #define FAT_NAME_LEN 8 |
46 | #define FAT_NAME_LEN 8 |
47 | #define FAT_EXT_LEN 3 |
47 | #define FAT_EXT_LEN 3 |
48 | 48 | ||
49 | #define FAT_PAD ' ' |
49 | #define FAT_PAD ' ' |
50 | 50 | ||
51 | #define FAT_DENTRY_UNUSED 0x00 |
51 | #define FAT_DENTRY_UNUSED 0x00 |
52 | #define FAT_DENTRY_E5_ESC 0x05 |
52 | #define FAT_DENTRY_E5_ESC 0x05 |
53 | #define FAT_DENTRY_DOT 0x2e |
53 | #define FAT_DENTRY_DOT 0x2e |
54 | #define FAT_DENTRY_ERASED 0xe5 |
54 | #define FAT_DENTRY_ERASED 0xe5 |
55 | 55 | ||
- | 56 | /** Compare one component of path to a directory entry. |
|
- | 57 | * |
|
- | 58 | * @param dentry Directory entry to compare the path component with. |
|
- | 59 | * @param start Index into PLB where the path component starts. |
|
- | 60 | * @param last Index of the last character of the path in PLB. |
|
- | 61 | * |
|
- | 62 | * @return Zero on failure or delta such that (index + delta) % |
|
- | 63 | * PLB_SIZE points to a new path component in PLB. |
|
- | 64 | */ |
|
56 | static int match_path_component(fat_dentry_t *dentry, unsigned index, |
65 | static unsigned match_path_component(fat_dentry_t *dentry, unsigned start, |
57 | size_t len) |
66 | unsigned last) |
58 | { |
67 | { |
- | 68 | unsigned cur; /* current position in PLB */ |
|
- | 69 | int pos; /* current position in dentry->name or dentry->ext */ |
|
- | 70 | bool name_processed = false; |
|
- | 71 | bool dot_processed = false; |
|
- | 72 | bool ext_processed = false; |
|
- | 73 | ||
- | 74 | if (last < start) |
|
- | 75 | last += PLB_SIZE; |
|
- | 76 | for (pos = 0, cur = start; (cur <= last) && (PLB_GET_CHAR(cur) != '/'); |
|
- | 77 | pos++, cur++) { |
|
- | 78 | if (!name_processed) { |
|
- | 79 | if ((pos == FAT_NAME_LEN - 1) || |
|
- | 80 | (dentry->name[pos + 1] == FAT_PAD)) { |
|
- | 81 | /* this is the last character in name */ |
|
- | 82 | name_processed = true; |
|
- | 83 | } |
|
- | 84 | if (dentry->name[0] == FAT_PAD) { |
|
- | 85 | /* name is empty */ |
|
- | 86 | name_processed = true; |
|
- | 87 | } else if ((pos == 0) && (dentry->name[pos] == |
|
- | 88 | FAT_DENTRY_E5_ESC)) { |
|
- | 89 | if (PLB_GET_CHAR(cur) == 0xe5) |
|
- | 90 | continue; |
|
- | 91 | else |
|
- | 92 | return 0; /* character mismatch */ |
|
- | 93 | } else { |
|
- | 94 | if (PLB_GET_CHAR(cur) == dentry->name[pos]) |
|
- | 95 | continue; |
|
- | 96 | else |
|
- | 97 | return 0; /* character mismatch */ |
|
- | 98 | } |
|
- | 99 | } |
|
- | 100 | if (!dot_processed) { |
|
- | 101 | dot_processed = true; |
|
- | 102 | pos = -1; |
|
- | 103 | if (PLB_GET_CHAR(cur) != '.') |
|
- | 104 | return 0; |
|
- | 105 | continue; |
|
- | 106 | } |
|
- | 107 | if (!ext_processed) { |
|
- | 108 | if ((pos == FAT_EXT_LEN - 1) || |
|
- | 109 | (dentry->ext[pos + 1] == FAT_PAD)) { |
|
- | 110 | /* this is the last character in ext */ |
|
- | 111 | ext_processed = true; |
|
- | 112 | } |
|
- | 113 | if (dentry->ext[0] == FAT_PAD) { |
|
- | 114 | /* ext is empty; the match will fail */ |
|
- | 115 | ext_processed = true; |
|
- | 116 | } else if (PLB_GET_CHAR(cur) == dentry->ext[pos]) { |
|
- | 117 | continue; |
|
- | 118 | } else { |
|
- | 119 | /* character mismatch */ |
|
- | 120 | return 0; |
|
- | 121 | } |
|
- | 122 | } |
|
- | 123 | return 0; /* extra characters in the component */ |
|
- | 124 | } |
|
- | 125 | if (ext_processed || (name_processed && dentry->ext[0] == FAT_PAD)) |
|
- | 126 | return cur - start; |
|
- | 127 | else |
|
- | 128 | return 0; |
|
59 | } |
129 | } |
60 | 130 | ||
61 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
131 | void fat_lookup(ipc_callid_t rid, ipc_call_t *request) |
62 | { |
132 | { |
63 | int first = IPC_GET_ARG1(*request); |
133 | int first = IPC_GET_ARG1(*request); |
64 | int second = IPC_GET_ARG2(*request); |
134 | int second = IPC_GET_ARG2(*request); |
65 | int dev_handle = IPC_GET_ARG3(*request); |
135 | int dev_handle = IPC_GET_ARG3(*request); |
66 | 136 | ||
67 | 137 | ||
68 | } |
138 | } |
69 | 139 | ||
70 | /** |
140 | /** |
71 | * @} |
141 | * @} |
72 | */ |
142 | */ |
73 | 143 |