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1 | /* |
2 | * collate.c - NTFS kernel collation handling. Part of the Linux-NTFS project. |
3 | * |
4 | * Copyright (c) 2004 Anton Altaparmakov |
5 | * |
6 | * This program/include file is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License as published |
8 | * by the Free Software Foundation; either version 2 of the License, or |
9 | * (at your option) any later version. |
10 | * |
11 | * This program/include file is distributed in the hope that it will be |
12 | * useful, but WITHOUT ANY WARRANTY; without even the implied warranty |
13 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU General Public License |
17 | * along with this program (in the main directory of the Linux-NTFS |
18 | * distribution in the file COPYING); if not, write to the Free Software |
19 | * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ |
21 | |
22 | #include "collate.h" |
23 | #include "debug.h" |
24 | #include "ntfs.h" |
25 | |
26 | static int ntfs_collate_binary(ntfs_volume *vol, |
27 | const void *data1, const int data1_len, |
28 | const void *data2, const int data2_len) |
29 | { |
30 | int rc; |
31 | |
32 | ntfs_debug("Entering."); |
33 | rc = memcmp(data1, data2, min(data1_len, data2_len)); |
34 | if (!rc && (data1_len != data2_len)) { |
35 | if (data1_len < data2_len) |
36 | rc = -1; |
37 | else |
38 | rc = 1; |
39 | } |
40 | ntfs_debug("Done, returning %i", rc); |
41 | return rc; |
42 | } |
43 | |
44 | static int ntfs_collate_ntofs_ulong(ntfs_volume *vol, |
45 | const void *data1, const int data1_len, |
46 | const void *data2, const int data2_len) |
47 | { |
48 | int rc; |
49 | u32 d1, d2; |
50 | |
51 | ntfs_debug("Entering."); |
52 | // FIXME: We don't really want to bug here. |
53 | BUG_ON(data1_len != data2_len); |
54 | BUG_ON(data1_len != 4); |
55 | d1 = le32_to_cpup(data1); |
56 | d2 = le32_to_cpup(data2); |
57 | if (d1 < d2) |
58 | rc = -1; |
59 | else { |
60 | if (d1 == d2) |
61 | rc = 0; |
62 | else |
63 | rc = 1; |
64 | } |
65 | ntfs_debug("Done, returning %i", rc); |
66 | return rc; |
67 | } |
68 | |
69 | typedef int (*ntfs_collate_func_t)(ntfs_volume *, const void *, const int, |
70 | const void *, const int); |
71 | |
72 | static ntfs_collate_func_t ntfs_do_collate0x0[3] = { |
73 | ntfs_collate_binary, |
74 | NULL/*ntfs_collate_file_name*/, |
75 | NULL/*ntfs_collate_unicode_string*/, |
76 | }; |
77 | |
78 | static ntfs_collate_func_t ntfs_do_collate0x1[4] = { |
79 | ntfs_collate_ntofs_ulong, |
80 | NULL/*ntfs_collate_ntofs_sid*/, |
81 | NULL/*ntfs_collate_ntofs_security_hash*/, |
82 | NULL/*ntfs_collate_ntofs_ulongs*/, |
83 | }; |
84 | |
85 | /** |
86 | * ntfs_collate - collate two data items using a specified collation rule |
87 | * @vol: ntfs volume to which the data items belong |
88 | * @cr: collation rule to use when comparing the items |
89 | * @data1: first data item to collate |
90 | * @data1_len: length in bytes of @data1 |
91 | * @data2: second data item to collate |
92 | * @data2_len: length in bytes of @data2 |
93 | * |
94 | * Collate the two data items @data1 and @data2 using the collation rule @cr |
95 | * and return -1, 0, ir 1 if @data1 is found, respectively, to collate before, |
96 | * to match, or to collate after @data2. |
97 | * |
98 | * For speed we use the collation rule @cr as an index into two tables of |
99 | * function pointers to call the appropriate collation function. |
100 | */ |
101 | int ntfs_collate(ntfs_volume *vol, COLLATION_RULE cr, |
102 | const void *data1, const int data1_len, |
103 | const void *data2, const int data2_len) { |
104 | int i; |
105 | |
106 | ntfs_debug("Entering."); |
107 | /* |
108 | * FIXME: At the moment we only support COLLATION_BINARY and |
109 | * COLLATION_NTOFS_ULONG, so we BUG() for everything else for now. |
110 | */ |
111 | BUG_ON(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG); |
112 | i = le32_to_cpu(cr); |
113 | BUG_ON(i < 0); |
114 | if (i <= 0x02) |
115 | return ntfs_do_collate0x0[i](vol, data1, data1_len, |
116 | data2, data2_len); |
117 | BUG_ON(i < 0x10); |
118 | i -= 0x10; |
119 | if (likely(i <= 3)) |
120 | return ntfs_do_collate0x1[i](vol, data1, data1_len, |
121 | data2, data2_len); |
122 | BUG(); |
123 | return 0; |
124 | } |
125 |
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