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path: root/libntfs-3g/collate.c (plain)
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1/**
2 * collate.c - NTFS collation handling. Originated from the Linux-NTFS project.
3 *
4 * Copyright (c) 2004 Anton Altaparmakov
5 * Copyright (c) 2005 Yura Pakhuchiy
6 *
7 * This program/include file is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as published
9 * by the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program/include file is distributed in the hope that it will be
13 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program (in the main directory of the NTFS-3G
19 * distribution in the file COPYING); if not, write to the Free Software
20 * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 */
22
23#ifdef HAVE_CONFIG_H
24#include "config.h"
25#endif
26#ifdef HAVE_STDLIB_H
27#include <stdlib.h>
28#endif
29#ifdef HAVE_STRING_H
30#include <string.h>
31#endif
32#ifdef HAVE_ERRNO_H
33#include <errno.h>
34#endif
35
36#include "attrib.h"
37#include "index.h"
38#include "collate.h"
39#include "debug.h"
40#include "unistr.h"
41#include "logging.h"
42
43/**
44 * ntfs_collate_binary - Which of two binary objects should be listed first
45 * @vol: unused
46 * @data1:
47 * @data1_len:
48 * @data2:
49 * @data2_len:
50 *
51 * Description...
52 *
53 * Returns:
54 */
55static int ntfs_collate_binary(ntfs_volume *vol __attribute__((unused)),
56 const void *data1, const int data1_len,
57 const void *data2, const int data2_len)
58{
59 int rc;
60
61 ntfs_log_trace("Entering.\n");
62 rc = memcmp(data1, data2, min(data1_len, data2_len));
63 if (!rc && (data1_len != data2_len)) {
64 if (data1_len < data2_len)
65 rc = -1;
66 else
67 rc = 1;
68 }
69 ntfs_log_trace("Done, returning %i.\n", rc);
70 return rc;
71}
72
73/**
74 * ntfs_collate_ntofs_ulong - Which of two long ints should be listed first
75 * @vol: unused
76 * @data1:
77 * @data1_len:
78 * @data2:
79 * @data2_len:
80 *
81 * Description...
82 *
83 * Returns:
84 */
85static int ntfs_collate_ntofs_ulong(ntfs_volume *vol __attribute__((unused)),
86 const void *data1, const int data1_len,
87 const void *data2, const int data2_len)
88{
89 int rc;
90 u32 d1, d2;
91
92 ntfs_log_trace("Entering.\n");
93 if (data1_len != data2_len || data1_len != 4) {
94 ntfs_log_error("data1_len or/and data2_len not equal to 4.\n");
95 return NTFS_COLLATION_ERROR;
96 }
97 d1 = le32_to_cpup(data1);
98 d2 = le32_to_cpup(data2);
99 if (d1 < d2)
100 rc = -1;
101 else {
102 if (d1 == d2)
103 rc = 0;
104 else
105 rc = 1;
106 }
107 ntfs_log_trace("Done, returning %i.\n", rc);
108 return rc;
109}
110
111/**
112 * ntfs_collate_ntofs_ulongs - Which of two le32 arrays should be listed first
113 *
114 * Returns: -1, 0 or 1 depending of how the arrays compare
115 */
116
117static int ntfs_collate_ntofs_ulongs(ntfs_volume *vol __attribute__((unused)),
118 const void *data1, const int data1_len,
119 const void *data2, const int data2_len)
120{
121 int rc;
122 int len;
123 const le32 *p1, *p2;
124 u32 d1, d2;
125
126 ntfs_log_trace("Entering.\n");
127 if ((data1_len != data2_len) || (data1_len <= 0) || (data1_len & 3)) {
128 ntfs_log_error("data1_len or data2_len not valid\n");
129 return NTFS_COLLATION_ERROR;
130 }
131 p1 = (const le32*)data1;
132 p2 = (const le32*)data2;
133 len = data1_len;
134 do {
135 d1 = le32_to_cpup(p1);
136 p1++;
137 d2 = le32_to_cpup(p2);
138 p2++;
139 } while ((d1 == d2) && ((len -= 4) > 0));
140 if (d1 < d2)
141 rc = -1;
142 else {
143 if (d1 == d2)
144 rc = 0;
145 else
146 rc = 1;
147 }
148 ntfs_log_trace("Done, returning %i.\n", rc);
149 return rc;
150}
151
152/**
153 * ntfs_collate_ntofs_security_hash - Which of two security descriptors
154 * should be listed first
155 * @vol: unused
156 * @data1:
157 * @data1_len:
158 * @data2:
159 * @data2_len:
160 *
161 * JPA compare two security hash keys made of two unsigned le32
162 *
163 * Returns: -1, 0 or 1 depending of how the keys compare
164 */
165static int ntfs_collate_ntofs_security_hash(ntfs_volume *vol __attribute__((unused)),
166 const void *data1, const int data1_len,
167 const void *data2, const int data2_len)
168{
169 int rc;
170 u32 d1, d2;
171 const le32 *p1, *p2;
172
173 ntfs_log_trace("Entering.\n");
174 if (data1_len != data2_len || data1_len != 8) {
175 ntfs_log_error("data1_len or/and data2_len not equal to 8.\n");
176 return NTFS_COLLATION_ERROR;
177 }
178 p1 = (const le32*)data1;
179 p2 = (const le32*)data2;
180 d1 = le32_to_cpup(p1);
181 d2 = le32_to_cpup(p2);
182 if (d1 < d2)
183 rc = -1;
184 else {
185 if (d1 > d2)
186 rc = 1;
187 else {
188 p1++;
189 p2++;
190 d1 = le32_to_cpup(p1);
191 d2 = le32_to_cpup(p2);
192 if (d1 < d2)
193 rc = -1;
194 else {
195 if (d1 > d2)
196 rc = 1;
197 else
198 rc = 0;
199 }
200 }
201 }
202 ntfs_log_trace("Done, returning %i.\n", rc);
203 return rc;
204}
205
206/**
207 * ntfs_collate_file_name - Which of two filenames should be listed first
208 * @vol:
209 * @data1:
210 * @data1_len: unused
211 * @data2:
212 * @data2_len: unused
213 *
214 * Description...
215 *
216 * Returns:
217 */
218static int ntfs_collate_file_name(ntfs_volume *vol,
219 const void *data1, const int data1_len __attribute__((unused)),
220 const void *data2, const int data2_len __attribute__((unused)))
221{
222 const FILE_NAME_ATTR *file_name_attr1;
223 const FILE_NAME_ATTR *file_name_attr2;
224 int rc;
225
226 ntfs_log_trace("Entering.\n");
227 file_name_attr1 = (const FILE_NAME_ATTR*)data1;
228 file_name_attr2 = (const FILE_NAME_ATTR*)data2;
229 rc = ntfs_names_full_collate(
230 (ntfschar*)&file_name_attr1->file_name,
231 file_name_attr1->file_name_length,
232 (ntfschar*)&file_name_attr2->file_name,
233 file_name_attr2->file_name_length,
234 CASE_SENSITIVE, vol->upcase, vol->upcase_len);
235 ntfs_log_trace("Done, returning %i.\n", rc);
236 return rc;
237}
238
239/*
240 * Get a pointer to appropriate collation function.
241 *
242 * Returns NULL if the needed function is not implemented
243 */
244
245COLLATE ntfs_get_collate_function(COLLATION_RULES cr)
246{
247 COLLATE collate;
248
249 switch (cr) {
250 case COLLATION_BINARY :
251 collate = ntfs_collate_binary;
252 break;
253 case COLLATION_FILE_NAME :
254 collate = ntfs_collate_file_name;
255 break;
256 case COLLATION_NTOFS_SECURITY_HASH :
257 collate = ntfs_collate_ntofs_security_hash;
258 break;
259 case COLLATION_NTOFS_ULONG :
260 collate = ntfs_collate_ntofs_ulong;
261 break;
262 case COLLATION_NTOFS_ULONGS :
263 collate = ntfs_collate_ntofs_ulongs;
264 break;
265 default :
266 errno = EOPNOTSUPP;
267 collate = (COLLATE)NULL;
268 break;
269 }
270 return (collate);
271}
272
generated by cgit at 2024-05-18 23:29:58 (GMT)