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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 | * |
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- | 58 | * @param dentry Directory entry to compare the path component with. |
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- | 59 | * @param start Index into PLB where the path component starts. |
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- | 60 | * @param last Index of the last character of the path in PLB. |
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- | 61 | * |
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- | 62 | * @return Zero on failure or delta such that (index + delta) % |
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- | 63 | * PLB_SIZE points to a new path component in PLB. |
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- | 64 | */ |
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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 */ |
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- | 69 | int pos; /* current position in dentry->name or dentry->ext */ |
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- | 70 | bool name_processed = false; |
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- | 71 | bool dot_processed = false; |
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- | 72 | bool ext_processed = false; |
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- | 73 | ||
- | 74 | if (last < start) |
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- | 75 | last += PLB_SIZE; |
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- | 76 | for (pos = 0, cur = start; (cur <= last) && (PLB_GET_CHAR(cur) != '/'); |
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- | 77 | pos++, cur++) { |
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- | 78 | if (!name_processed) { |
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- | 79 | if ((pos == FAT_NAME_LEN - 1) || |
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- | 80 | (dentry->name[pos + 1] == FAT_PAD)) { |
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- | 81 | /* this is the last character in name */ |
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- | 82 | name_processed = true; |
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- | 83 | } |
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- | 84 | if (dentry->name[0] == FAT_PAD) { |
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- | 85 | /* name is empty */ |
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- | 86 | name_processed = true; |
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- | 87 | } else if ((pos == 0) && (dentry->name[pos] == |
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- | 88 | FAT_DENTRY_E5_ESC)) { |
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- | 89 | if (PLB_GET_CHAR(cur) == 0xe5) |
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- | 90 | continue; |
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- | 91 | else |
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- | 92 | return 0; /* character mismatch */ |
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- | 93 | } else { |
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- | 94 | if (PLB_GET_CHAR(cur) == dentry->name[pos]) |
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- | 95 | continue; |
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- | 96 | else |
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- | 97 | return 0; /* character mismatch */ |
|
- | 98 | } |
|
- | 99 | } |
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- | 100 | if (!dot_processed) { |
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- | 101 | dot_processed = true; |
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- | 102 | pos = -1; |
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- | 103 | if (PLB_GET_CHAR(cur) != '.') |
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- | 104 | return 0; |
|
- | 105 | continue; |
|
- | 106 | } |
|
- | 107 | if (!ext_processed) { |
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- | 108 | if ((pos == FAT_EXT_LEN - 1) || |
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- | 109 | (dentry->ext[pos + 1] == FAT_PAD)) { |
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- | 110 | /* this is the last character in ext */ |
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- | 111 | ext_processed = true; |
|
- | 112 | } |
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- | 113 | if (dentry->ext[0] == FAT_PAD) { |
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- | 114 | /* ext is empty; the match will fail */ |
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- | 115 | ext_processed = true; |
|
- | 116 | } else if (PLB_GET_CHAR(cur) == dentry->ext[pos]) { |
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- | 117 | continue; |
|
- | 118 | } else { |
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- | 119 | /* character mismatch */ |
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- | 120 | return 0; |
|
- | 121 | } |
|
- | 122 | } |
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- | 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); |