1 /* $FreeBSD$ */
2 /* $NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $ */
3
4 /*-
5 * Copyright (C) 1995, 1997 Wolfgang Solfrank.
6 * Copyright (C) 1995, 1997 TooLs GmbH.
7 * All rights reserved.
8 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by TooLs GmbH.
21 * 4. The name of TooLs GmbH may not be used to endorse or promote products
22 * derived from this software without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
25 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
26 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
27 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
28 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
29 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
30 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
31 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
33 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35 /*-
36 * Written by Paul Popelka (paulp@uts.amdahl.com)
37 *
38 * You can do anything you want with this software, just don't say you wrote
39 * it, and don't remove this notice.
40 *
41 * This software is provided "as is".
42 *
43 * The author supplies this software to be publicly redistributed on the
44 * understanding that the author is not responsible for the correct
45 * functioning of this software in any circumstances and is not liable for
46 * any damages caused by this software.
47 *
48 * October 1992
49 */
50
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/dirent.h>
54 #include <sys/iconv.h>
55 #include <sys/mount.h>
56
57 #include <fs/msdosfs/bpb.h>
58 #include <fs/msdosfs/direntry.h>
59 #include <fs/msdosfs/msdosfsmount.h>
60
61 extern struct iconv_functions *msdosfs_iconv;
62
63 static int mbsadjpos(const char **, size_t, size_t, int, int, void *handle);
64 static u_char * dos2unixchr(u_char *, const u_char **, size_t *, int, struct msdosfsmount *);
65 static u_int16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
66 static u_char * win2unixchr(u_char *, u_int16_t, struct msdosfsmount *);
67 static u_int16_t unix2winchr(const u_char **, size_t *, int, struct msdosfsmount *);
68
69 /*
70 * 0 - character disallowed in long file name.
71 * 1 - character should be replaced by '_' in DOS file name,
72 * and generation number inserted.
73 * 2 - character ('.' and ' ') should be skipped in DOS file name,
74 * and generation number inserted.
75 */
76 static u_char
77 unix2dos[256] = {
78 /* iso8859-1 -> cp850 */
79 0, 0, 0, 0, 0, 0, 0, 0, /* 00-07 */
80 0, 0, 0, 0, 0, 0, 0, 0, /* 08-0f */
81 0, 0, 0, 0, 0, 0, 0, 0, /* 10-17 */
82 0, 0, 0, 0, 0, 0, 0, 0, /* 18-1f */
83 2, 0x21, 0, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
84 0x28, 0x29, 0, 1, 1, 0x2d, 2, 0, /* 28-2f */
85 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
86 0x38, 0x39, 0, 1, 0, 1, 0, 0, /* 38-3f */
87 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
88 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
89 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
90 0x58, 0x59, 0x5a, 1, 0, 1, 0x5e, 0x5f, /* 58-5f */
91 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
92 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
93 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
94 0x58, 0x59, 0x5a, 0x7b, 0, 0x7d, 0x7e, 0, /* 78-7f */
95 0, 0, 0, 0, 0, 0, 0, 0, /* 80-87 */
96 0, 0, 0, 0, 0, 0, 0, 0, /* 88-8f */
97 0, 0, 0, 0, 0, 0, 0, 0, /* 90-97 */
98 0, 0, 0, 0, 0, 0, 0, 0, /* 98-9f */
99 0, 0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
100 0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
101 0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
102 0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
103 0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
104 0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
105 0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
106 0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
107 0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
108 0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
109 0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
110 0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
111 };
112
113 static u_char
114 dos2unix[256] = {
115 /* cp850 -> iso8859-1 */
116 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
117 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
118 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
119 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
120 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
121 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
122 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
123 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
124 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
125 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
126 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
127 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
128 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
129 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
130 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
131 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
132 0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
133 0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
134 0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
135 0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
136 0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
137 0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
138 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
139 0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
140 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
141 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
142 0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
143 0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
144 0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
145 0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
146 0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
147 0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
148 };
149
150 static u_char
151 u2l[256] = {
152 /* tolower */
153 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
154 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
155 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
156 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
157 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
158 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
159 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
160 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
161 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
162 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
163 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
164 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
165 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
166 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
167 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
168 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
169 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
170 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
171 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
172 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
173 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
174 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
175 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
176 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
177 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
178 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
179 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
180 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
181 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
182 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
183 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
184 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
185 };
186
187 static u_char
188 l2u[256] = {
189 /* toupper */
190 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
191 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
192 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
193 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
194 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
195 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
196 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
197 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
198 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
199 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
200 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
201 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
202 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
203 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
204 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
205 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
206 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
207 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
208 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
209 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
210 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
211 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
212 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
213 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
214 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
215 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
216 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
217 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
218 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
219 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
220 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
221 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
222 };
223
224 /*
225 * DOS filenames are made of 2 parts, the name part and the extension part.
226 * The name part is 8 characters long and the extension part is 3
227 * characters long. They may contain trailing blanks if the name or
228 * extension are not long enough to fill their respective fields.
229 */
230
231 /*
232 * Convert a DOS filename to a unix filename. And, return the number of
233 * characters in the resulting unix filename excluding the terminating
234 * null.
235 */
236 int
237 dos2unixfn(dn, un, lower, pmp)
238 u_char dn[11];
239 u_char *un;
240 int lower;
241 struct msdosfsmount *pmp;
242 {
243 size_t i;
244 int thislong = 0;
245 u_char *c, tmpbuf[5];
246
247 /*
248 * If first char of the filename is SLOT_E5 (0x05), then the real
249 * first char of the filename should be 0xe5. But, they couldn't
250 * just have a 0xe5 mean 0xe5 because that is used to mean a freed
251 * directory slot. Another dos quirk.
252 */
253 if (*dn == SLOT_E5)
254 *dn = 0xe5;
255
256 /*
257 * Copy the name portion into the unix filename string.
258 */
259 for (i = 8; i > 0 && *dn != ' ';) {
260 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn), &i,
261 lower & LCASE_BASE, pmp);
262 while (*c != '\0') {
263 *un++ = *c++;
264 thislong++;
265 }
266 }
267 dn += i;
268
269 /*
270 * Now, if there is an extension then put in a period and copy in
271 * the extension.
272 */
273 if (*dn != ' ') {
274 *un++ = '.';
275 thislong++;
276 for (i = 3; i > 0 && *dn != ' ';) {
277 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn),
278 &i, lower & LCASE_EXT, pmp);
279 while (*c != '\0') {
280 *un++ = *c++;
281 thislong++;
282 }
283 }
284 }
285 *un++ = 0;
286
287 return (thislong);
288 }
289
290 /*
291 * Convert a unix filename to a DOS filename according to Win95 rules.
292 * If applicable and gen is not 0, it is inserted into the converted
293 * filename as a generation number.
294 * Returns
295 * 0 if name couldn't be converted
296 * 1 if the converted name is the same as the original
297 * (no long filename entry necessary for Win95)
298 * 2 if conversion was successful
299 * 3 if conversion was successful and generation number was inserted
300 */
301 int
302 unix2dosfn(un, dn, unlen, gen, pmp)
303 const u_char *un;
304 u_char dn[12];
305 size_t unlen;
306 u_int gen;
307 struct msdosfsmount *pmp;
308 {
309 ssize_t i, j;
310 int l;
311 int conv = 1;
312 const u_char *cp, *dp, *dp1;
313 u_char gentext[6], *wcp;
314 u_int16_t c;
315
316 /*
317 * Fill the dos filename string with blanks. These are DOS's pad
318 * characters.
319 */
320 for (i = 0; i < 11; i++)
321 dn[i] = ' ';
322 dn[11] = 0;
323
324 /*
325 * The filenames "." and ".." are handled specially, since they
326 * don't follow dos filename rules.
327 */
328 if (un[0] == '.' && unlen == 1) {
329 dn[0] = '.';
330 return gen <= 1;
331 }
332 if (un[0] == '.' && un[1] == '.' && unlen == 2) {
333 dn[0] = '.';
334 dn[1] = '.';
335 return gen <= 1;
336 }
337
338 /*
339 * Filenames with only blanks and dots are not allowed!
340 */
341 for (cp = un, i = unlen; --i >= 0; cp++)
342 if (*cp != ' ' && *cp != '.')
343 break;
344 if (i < 0)
345 return 0;
346
347
348 /*
349 * Filenames with some characters are not allowed!
350 */
351 for (cp = un, i = unlen; i > 0;)
352 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
353 return 0;
354
355 /*
356 * Now find the extension
357 * Note: dot as first char doesn't start extension
358 * and trailing dots and blanks are ignored
359 * Note(2003/7): It seems recent Windows has
360 * defferent rule than this code, that Windows
361 * ignores all dots before extension, and use all
362 * chars as filename except for dots.
363 */
364 dp = dp1 = 0;
365 for (cp = un + 1, i = unlen - 1; --i >= 0;) {
366 switch (*cp++) {
367 case '.':
368 if (!dp1)
369 dp1 = cp;
370 break;
371 case ' ':
372 break;
373 default:
374 if (dp1)
375 dp = dp1;
376 dp1 = 0;
377 break;
378 }
379 }
380
381 /*
382 * Now convert it (this part is for extension).
383 * As Windows XP do, if it's not ascii char,
384 * this function should return 2 or 3, so that checkng out Unicode name.
385 */
386 if (dp) {
387 if (dp1)
388 l = dp1 - dp;
389 else
390 l = unlen - (dp - un);
391 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
392 c = unix2doschr(&cp, (size_t *)&i, pmp);
393 if (c & 0xff00) {
394 dn[j] = c >> 8;
395 if (++j < 11) {
396 dn[j] = c;
397 if (conv != 3)
398 conv = 2;
399 continue;
400 } else {
401 conv = 3;
402 dn[j-1] = ' ';
403 break;
404 }
405 } else {
406 dn[j] = c;
407 }
408 if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
409 conv = 2;
410 if (dn[j] == 1) {
411 conv = 3;
412 dn[j] = '_';
413 }
414 if (dn[j] == 2) {
415 conv = 3;
416 dn[j--] = ' ';
417 }
418 }
419 if (i > 0)
420 conv = 3;
421 dp--;
422 } else {
423 for (dp = cp; *--dp == ' ' || *dp == '.';);
424 dp++;
425 }
426
427 /*
428 * Now convert the rest of the name
429 */
430 for (i = dp - un, j = 0; un < dp && j < 8; j++) {
431 c = unix2doschr(&un, &i, pmp);
432 if (c & 0xff00) {
433 dn[j] = c >> 8;
434 if (++j < 8) {
435 dn[j] = c;
436 if (conv != 3)
437 conv = 2;
438 continue;
439 } else {
440 conv = 3;
441 dn[j-1] = ' ';
442 break;
443 }
444 } else {
445 dn[j] = c;
446 }
447 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
448 conv = 2;
449 if (dn[j] == 1) {
450 conv = 3;
451 dn[j] = '_';
452 }
453 if (dn[j] == 2) {
454 conv = 3;
455 dn[j--] = ' ';
456 }
457 }
458 if (un < dp)
459 conv = 3;
460 /*
461 * If we didn't have any chars in filename,
462 * generate a default
463 */
464 if (!j)
465 dn[0] = '_';
466
467 /*
468 * If there wasn't any char dropped,
469 * there is no place for generation numbers
470 */
471 if (conv != 3) {
472 if (gen > 1)
473 conv = 0;
474 goto done;
475 }
476
477 /*
478 * Now insert the generation number into the filename part
479 */
480 if (gen == 0)
481 goto done;
482 for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
483 *--wcp = gen % 10 + '';
484 if (gen) {
485 conv = 0;
486 goto done;
487 }
488 for (i = 8; dn[--i] == ' ';);
489 i++;
490 if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
491 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
492 /*
493 * Correct posision to where insert the generation number
494 */
495 cp = dn;
496 i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
497
498 dn[i++] = '~';
499 while (wcp < gentext + sizeof(gentext))
500 dn[i++] = *wcp++;
501
502 /*
503 * Tail of the filename should be space
504 */
505 while (i < 8)
506 dn[i++] = ' ';
507 conv = 3;
508
509 done:
510 /*
511 * The first character cannot be E5,
512 * because that means a deleted entry
513 */
514 if (dn[0] == 0xe5)
515 dn[0] = SLOT_E5;
516
517 return conv;
518 }
519
520 /*
521 * Create a Win95 long name directory entry
522 * Note: assumes that the filename is valid,
523 * i.e. doesn't consist solely of blanks and dots
524 */
525 int
526 unix2winfn(un, unlen, wep, cnt, chksum, pmp)
527 const u_char *un;
528 size_t unlen;
529 struct winentry *wep;
530 int cnt;
531 int chksum;
532 struct msdosfsmount *pmp;
533 {
534 u_int8_t *wcp;
535 int i, end;
536 u_int16_t code;
537
538 /*
539 * Drop trailing blanks and dots
540 */
541 unlen = winLenFixup(un, unlen);
542
543 /*
544 * Cut *un for this slot
545 */
546 unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
547 pmp->pm_flags, pmp->pm_u2w);
548
549 /*
550 * Initialize winentry to some useful default
551 */
552 for (wcp = (u_int8_t *)wep, i = sizeof(*wep); --i >= 0; *wcp++ = 0xff);
553 wep->weCnt = cnt;
554 wep->weAttributes = ATTR_WIN95;
555 wep->weReserved1 = 0;
556 wep->weChksum = chksum;
557 wep->weReserved2 = 0;
558
559 /*
560 * Now convert the filename parts
561 */
562 end = 0;
563 for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;) {
564 code = unix2winchr(&un, &unlen, 0, pmp);
565 *wcp++ = code;
566 *wcp++ = code >> 8;
567 if (!code)
568 end = WIN_LAST;
569 }
570 for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;) {
571 code = unix2winchr(&un, &unlen, 0, pmp);
572 *wcp++ = code;
573 *wcp++ = code >> 8;
574 if (!code)
575 end = WIN_LAST;
576 }
577 for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
578 code = unix2winchr(&un, &unlen, 0, pmp);
579 *wcp++ = code;
580 *wcp++ = code >> 8;
581 if (!code)
582 end = WIN_LAST;
583 }
584 if (*un == '\0')
585 end = WIN_LAST;
586 wep->weCnt |= end;
587 return !end;
588 }
589
590 /*
591 * Compare our filename to the one in the Win95 entry
592 * Returns the checksum or -1 if no match
593 */
594 int
595 winChkName(nbp, un, unlen, chksum, pmp)
596 struct mbnambuf *nbp;
597 const u_char *un;
598 size_t unlen;
599 int chksum;
600 struct msdosfsmount *pmp;
601 {
602 size_t len;
603 u_int16_t c1, c2;
604 u_char *np;
605 struct dirent dirbuf;
606
607 /*
608 * We already have winentry in *nbp.
609 */
610 if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
611 return -1;
612
613 #ifdef MSDOSFS_DEBUG
614 printf("winChkName(): un=%s:%d,d_name=%s:%d\n", un, unlen,
615 dirbuf.d_name,
616 dirbuf.d_namlen);
617 #endif
618
619 /*
620 * Compare the name parts
621 */
622 len = dirbuf.d_namlen;
623 if (unlen != len)
624 return -2;
625
626 for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
627 /*
628 * Comparison must be case insensitive, because FAT disallows
629 * to look up or create files in case sensitive even when
630 * it's a long file name.
631 */
632 c1 = unix2winchr(__DECONST(const u_char **, &np), &len,
633 LCASE_BASE, pmp);
634 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
635 if (c1 != c2)
636 return -2;
637 }
638 return chksum;
639 }
640
641 /*
642 * Convert Win95 filename to dirbuf.
643 * Returns the checksum or -1 if impossible
644 */
645 int
646 win2unixfn(nbp, wep, chksum, pmp)
647 struct mbnambuf *nbp;
648 struct winentry *wep;
649 int chksum;
650 struct msdosfsmount *pmp;
651 {
652 u_char *c, tmpbuf[5];
653 u_int8_t *cp;
654 u_int8_t *np, name[WIN_CHARS * 3 + 1];
655 u_int16_t code;
656 int i;
657
658 if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
659 || !(wep->weCnt&WIN_CNT))
660 return -1;
661
662 /*
663 * First compare checksums
664 */
665 if (wep->weCnt&WIN_LAST) {
666 chksum = wep->weChksum;
667 } else if (chksum != wep->weChksum)
668 chksum = -1;
669 if (chksum == -1)
670 return -1;
671
672 /*
673 * Convert the name parts
674 */
675 np = name;
676 for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
677 code = (cp[1] << 8) | cp[0];
678 switch (code) {
679 case 0:
680 *np = '\0';
681 mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
682 return chksum;
683 case '/':
684 *np = '\0';
685 return -1;
686 default:
687 c = win2unixchr(tmpbuf, code, pmp);
688 while (*c != '\0')
689 *np++ = *c++;
690 break;
691 }
692 cp += 2;
693 }
694 for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
695 code = (cp[1] << 8) | cp[0];
696 switch (code) {
697 case 0:
698 *np = '\0';
699 mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
700 return chksum;
701 case '/':
702 *np = '\0';
703 return -1;
704 default:
705 c = win2unixchr(tmpbuf, code, pmp);
706 while (*c != '\0')
707 *np++ = *c++;
708 break;
709 }
710 cp += 2;
711 }
712 for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
713 code = (cp[1] << 8) | cp[0];
714 switch (code) {
715 case 0:
716 *np = '\0';
717 mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
718 return chksum;
719 case '/':
720 *np = '\0';
721 return -1;
722 default:
723 c = win2unixchr(tmpbuf, code, pmp);
724 while (*c != '\0')
725 *np++ = *c++;
726 break;
727 }
728 cp += 2;
729 }
730 *np = '\0';
731 mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1);
732 return chksum;
733 }
734
735 /*
736 * Compute the unrolled checksum of a DOS filename for Win95 LFN use.
737 */
738 u_int8_t
739 winChksum(u_int8_t *name)
740 {
741 int i;
742 u_int8_t s;
743
744 for (s = 0, i = 11; --i >= 0; s += *name++)
745 s = (s << 7)|(s >> 1);
746 return (s);
747 }
748
749 /*
750 * Determine the number of slots necessary for Win95 names
751 */
752 int
753 winSlotCnt(un, unlen, pmp)
754 const u_char *un;
755 size_t unlen;
756 struct msdosfsmount *pmp;
757 {
758 size_t wlen;
759 char wn[WIN_MAXLEN * 2 + 1], *wnp;
760
761 unlen = winLenFixup(un, unlen);
762
763 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
764 wlen = WIN_MAXLEN * 2;
765 wnp = wn;
766 msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
767 if (unlen > 0)
768 return 0;
769 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
770 }
771
772 if (unlen > WIN_MAXLEN)
773 return 0;
774 return howmany(unlen, WIN_CHARS);
775 }
776
777 /*
778 * Determine the number of bytes neccesary for Win95 names
779 */
780 size_t
781 winLenFixup(un, unlen)
782 const u_char* un;
783 size_t unlen;
784 {
785 for (un += unlen; unlen > 0; unlen--)
786 if (*--un != ' ' && *un != '.')
787 break;
788 return unlen;
789 }
790
791 /*
792 * Store an area with multi byte string instr, and reterns left
793 * byte of instr and moves pointer forward. The area's size is
794 * inlen or outlen.
795 */
796 static int
797 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag, void *handle)
798 {
799 char *outp, outstr[outlen * weight + 1];
800
801 if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
802 outp = outstr;
803 outlen *= weight;
804 msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
805 return (inlen);
806 }
807
808 (*instr) += min(inlen, outlen);
809 return (inlen - min(inlen, outlen));
810 }
811
812 /*
813 * Convert DOS char to Local char
814 */
815 static u_char *
816 dos2unixchr(u_char *outbuf, const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
817 {
818 u_char c, *outp;
819 size_t len, olen;
820
821 outp = outbuf;
822 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
823 olen = len = 4;
824
825 if (lower & (LCASE_BASE | LCASE_EXT))
826 msdosfs_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
827 ilen, (char **)&outp, &olen, KICONV_LOWER);
828 else
829 msdosfs_iconv->convchr(pmp->pm_d2u, (const char **)instr,
830 ilen, (char **)&outp, &olen);
831 len -= olen;
832
833 /*
834 * return '?' if failed to convert
835 */
836 if (len == 0) {
837 (*ilen)--;
838 (*instr)++;
839 *outp++ = '?';
840 }
841 } else {
842 (*ilen)--;
843 c = *(*instr)++;
844 c = dos2unix[c];
845 if (lower & (LCASE_BASE | LCASE_EXT))
846 c = u2l[c];
847 *outp++ = c;
848 outbuf[1] = '\0';
849 }
850
851 *outp = '\0';
852 outp = outbuf;
853 return (outp);
854 }
855
856 /*
857 * Convert Local char to DOS char
858 */
859 static u_int16_t
860 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
861 {
862 u_char c;
863 char *up, *outp, unicode[3], outbuf[3];
864 u_int16_t wc;
865 size_t len, ucslen, unixlen, olen;
866
867 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
868 /*
869 * to hide an invisible character, using a unicode filter
870 */
871 ucslen = 2;
872 len = *ilen;
873 up = unicode;
874 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
875 ilen, &up, &ucslen);
876 unixlen = len - *ilen;
877
878 /*
879 * cannot be converted
880 */
881 if (unixlen == 0) {
882 (*ilen)--;
883 (*instr)++;
884 return (0);
885 }
886
887 /*
888 * return magic number for ascii char
889 */
890 if (unixlen == 1) {
891 c = *(*instr -1);
892 if (! (c & 0x80)) {
893 c = unix2dos[c];
894 if (c <= 2)
895 return (c);
896 }
897 }
898
899 /*
900 * now convert using libiconv
901 */
902 *instr -= unixlen;
903 *ilen = len;
904
905 olen = len = 2;
906 outp = outbuf;
907 msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
908 ilen, &outp, &olen, KICONV_FROM_UPPER);
909 len -= olen;
910
911 /*
912 * cannot be converted, but has unicode char, should return magic number
913 */
914 if (len == 0) {
915 (*ilen) -= unixlen;
916 (*instr) += unixlen;
917 return (1);
918 }
919
920 wc = 0;
921 while(len--)
922 wc |= (*(outp - len - 1) & 0xff) << (len << 3);
923 return (wc);
924 }
925
926 (*ilen)--;
927 c = *(*instr)++;
928 c = l2u[c];
929 c = unix2dos[c];
930 return ((u_int16_t)c);
931 }
932
933 /*
934 * Convert Windows char to Local char
935 */
936 static u_char *
937 win2unixchr(u_char *outbuf, u_int16_t wc, struct msdosfsmount *pmp)
938 {
939 u_char *inp, *outp, inbuf[3];
940 size_t ilen, olen, len;
941
942 outp = outbuf;
943 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
944 inbuf[0] = (u_char)(wc>>8);
945 inbuf[1] = (u_char)wc;
946 inbuf[2] = '\0';
947
948 ilen = 2;
949 olen = len = 4;
950 inp = inbuf;
951 msdosfs_iconv->convchr(pmp->pm_w2u, __DECONST(const char **,
952 &inp), &ilen, (char **)&outp, &olen);
953 len -= olen;
954
955 /*
956 * return '?' if failed to convert
957 */
958 if (len == 0)
959 *outp++ = '?';
960 } else {
961 *outp++ = (wc & 0xff00) ? '?' : (u_char)(wc & 0xff);
962 }
963
964 *outp = '\0';
965 outp = outbuf;
966 return (outp);
967 }
968
969 /*
970 * Convert Local char to Windows char
971 */
972 static u_int16_t
973 unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
974 {
975 u_char *outp, outbuf[3];
976 u_int16_t wc;
977 size_t olen;
978
979 if (*ilen == 0)
980 return (0);
981
982 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
983 outp = outbuf;
984 olen = 2;
985 if (lower & (LCASE_BASE | LCASE_EXT))
986 msdosfs_iconv->convchr_case(pmp->pm_u2w, (const char **)instr,
987 ilen, (char **)&outp, &olen,
988 KICONV_FROM_LOWER);
989 else
990 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
991 ilen, (char **)&outp, &olen);
992
993 /*
994 * return '' if end of filename
995 */
996 if (olen == 2)
997 return (0);
998
999 wc = (outbuf[0]<<8) | outbuf[1];
1000
1001 return (wc);
1002 }
1003
1004 (*ilen)--;
1005 wc = (*instr)[0];
1006 if (lower & (LCASE_BASE | LCASE_EXT))
1007 wc = u2l[wc];
1008 (*instr)++;
1009 return (wc);
1010 }
1011
1012 /*
1013 * Initialize the temporary concatenation buffer.
1014 */
1015 void
1016 mbnambuf_init(struct mbnambuf *nbp)
1017 {
1018
1019 nbp->nb_len = 0;
1020 nbp->nb_last_id = -1;
1021 nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
1022 }
1023
1024 /*
1025 * Fill out our concatenation buffer with the given substring, at the offset
1026 * specified by its id. Since this function must be called with ids in
1027 * descending order, we take advantage of the fact that ASCII substrings are
1028 * exactly WIN_CHARS in length. For non-ASCII substrings, we shift all
1029 * previous (i.e. higher id) substrings upwards to make room for this one.
1030 * This only penalizes portions of substrings that contain more than
1031 * WIN_CHARS bytes when they are first encountered.
1032 */
1033 void
1034 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
1035 {
1036 char *slot;
1037 size_t count, newlen;
1038
1039 if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
1040 #ifdef MSDOSFS_DEBUG
1041 printf("msdosfs: non-decreasing id: id %d, last id %d\n",
1042 id, nbp->nb_last_id);
1043 #endif
1044 return;
1045 }
1046
1047 /* Will store this substring in a WIN_CHARS-aligned slot. */
1048 slot = &nbp->nb_buf[id * WIN_CHARS];
1049 count = strlen(name);
1050 newlen = nbp->nb_len + count;
1051 if (newlen > WIN_MAXLEN || newlen > MAXNAMLEN) {
1052 #ifdef MSDOSFS_DEBUG
1053 printf("msdosfs: file name length %zu too large\n", newlen);
1054 #endif
1055 return;
1056 }
1057
1058 /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
1059 if (count > WIN_CHARS && nbp->nb_len != 0)
1060 bcopy(slot + WIN_CHARS, slot + count, nbp->nb_len);
1061
1062 /* Copy in the substring to its slot and update length so far. */
1063 bcopy(name, slot, count);
1064 nbp->nb_len = newlen;
1065 nbp->nb_last_id = id;
1066 }
1067
1068 /*
1069 * Take the completed string and use it to setup the struct dirent.
1070 * Be sure to always nul-terminate the d_name and then copy the string
1071 * from our buffer. Note that this function assumes the full string has
1072 * been reassembled in the buffer. If it's called before all substrings
1073 * have been written via mbnambuf_write(), the result will be incorrect.
1074 */
1075 char *
1076 mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
1077 {
1078
1079 if (nbp->nb_len > sizeof(dp->d_name) - 1) {
1080 mbnambuf_init(nbp);
1081 return (NULL);
1082 }
1083 bcopy(&nbp->nb_buf[0], dp->d_name, nbp->nb_len);
1084 dp->d_name[nbp->nb_len] = '\0';
1085 dp->d_namlen = nbp->nb_len;
1086
1087 mbnambuf_init(nbp);
1088 return (dp->d_name);
1089 }
Cache object: fbe5e25e1682547cb840cd95e8715fbc
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