1 /* $NetBSD: msdosfs_conv.c,v 1.25 1997/11/17 15:36:40 ws Exp $ */
2
3 /*-
4 * SPDX-License-Identifier: BSD-4-Clause
5 *
6 * Copyright (C) 1995, 1997 Wolfgang Solfrank.
7 * Copyright (C) 1995, 1997 TooLs GmbH.
8 * All rights reserved.
9 * Original code by Paul Popelka (paulp@uts.amdahl.com) (see below).
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by TooLs GmbH.
22 * 4. The name of TooLs GmbH may not be used to endorse or promote products
23 * derived from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
28 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
29 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
30 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
31 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
32 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
33 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
34 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 */
36 /*-
37 * Written by Paul Popelka (paulp@uts.amdahl.com)
38 *
39 * You can do anything you want with this software, just don't say you wrote
40 * it, and don't remove this notice.
41 *
42 * This software is provided "as is".
43 *
44 * The author supplies this software to be publicly redistributed on the
45 * understanding that the author is not responsible for the correct
46 * functioning of this software in any circumstances and is not liable for
47 * any damages caused by this software.
48 *
49 * October 1992
50 */
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/dirent.h>
55 #include <sys/iconv.h>
56 #include <sys/mount.h>
57
58 #include <fs/msdosfs/bpb.h>
59 #include <fs/msdosfs/direntry.h>
60 #include <fs/msdosfs/msdosfsmount.h>
61
62 extern struct iconv_functions *msdosfs_iconv;
63
64 static int mbsadjpos(const char **, size_t, size_t, int, int, void *handle);
65 static u_char * dos2unixchr(u_char *, const u_char **, size_t *, int, struct msdosfsmount *);
66 static uint16_t unix2doschr(const u_char **, size_t *, struct msdosfsmount *);
67 static u_char * win2unixchr(u_char *, uint16_t, struct msdosfsmount *);
68 static uint16_t unix2winchr(const u_char **, size_t *, int, struct msdosfsmount *);
69
70 /*
71 * 0 - character disallowed in long file name.
72 * 1 - character should be replaced by '_' in DOS file name,
73 * and generation number inserted.
74 * 2 - character ('.' and ' ') should be skipped in DOS file name,
75 * and generation number inserted.
76 */
77 static const u_char
78 unix2dos[256] = {
79 /* iso8859-1 -> cp850 */
80 0, 0, 0, 0, 0, 0, 0, 0, /* 00-07 */
81 0, 0, 0, 0, 0, 0, 0, 0, /* 08-0f */
82 0, 0, 0, 0, 0, 0, 0, 0, /* 10-17 */
83 0, 0, 0, 0, 0, 0, 0, 0, /* 18-1f */
84 2, 0x21, 0, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
85 0x28, 0x29, 0, 1, 1, 0x2d, 2, 0, /* 28-2f */
86 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
87 0x38, 0x39, 0, 1, 0, 1, 0, 0, /* 38-3f */
88 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
89 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
90 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
91 0x58, 0x59, 0x5a, 1, 0, 1, 0x5e, 0x5f, /* 58-5f */
92 0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 60-67 */
93 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 68-6f */
94 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 70-77 */
95 0x58, 0x59, 0x5a, 0x7b, 0, 0x7d, 0x7e, 0, /* 78-7f */
96 0, 0, 0, 0, 0, 0, 0, 0, /* 80-87 */
97 0, 0, 0, 0, 0, 0, 0, 0, /* 88-8f */
98 0, 0, 0, 0, 0, 0, 0, 0, /* 90-97 */
99 0, 0, 0, 0, 0, 0, 0, 0, /* 98-9f */
100 0, 0xad, 0xbd, 0x9c, 0xcf, 0xbe, 0xdd, 0xf5, /* a0-a7 */
101 0xf9, 0xb8, 0xa6, 0xae, 0xaa, 0xf0, 0xa9, 0xee, /* a8-af */
102 0xf8, 0xf1, 0xfd, 0xfc, 0xef, 0xe6, 0xf4, 0xfa, /* b0-b7 */
103 0xf7, 0xfb, 0xa7, 0xaf, 0xac, 0xab, 0xf3, 0xa8, /* b8-bf */
104 0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* c0-c7 */
105 0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* c8-cf */
106 0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0x9e, /* d0-d7 */
107 0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0xe1, /* d8-df */
108 0xb7, 0xb5, 0xb6, 0xc7, 0x8e, 0x8f, 0x92, 0x80, /* e0-e7 */
109 0xd4, 0x90, 0xd2, 0xd3, 0xde, 0xd6, 0xd7, 0xd8, /* e8-ef */
110 0xd1, 0xa5, 0xe3, 0xe0, 0xe2, 0xe5, 0x99, 0xf6, /* f0-f7 */
111 0x9d, 0xeb, 0xe9, 0xea, 0x9a, 0xed, 0xe8, 0x98, /* f8-ff */
112 };
113
114 static const u_char
115 dos2unix[256] = {
116 /* cp850 -> iso8859-1 */
117 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 00-07 */
118 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 08-0f */
119 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 10-17 */
120 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, /* 18-1f */
121 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
122 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
123 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
124 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
125 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 40-47 */
126 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 48-4f */
127 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 50-57 */
128 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
129 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
130 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
131 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
132 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
133 0xc7, 0xfc, 0xe9, 0xe2, 0xe4, 0xe0, 0xe5, 0xe7, /* 80-87 */
134 0xea, 0xeb, 0xe8, 0xef, 0xee, 0xec, 0xc4, 0xc5, /* 88-8f */
135 0xc9, 0xe6, 0xc6, 0xf4, 0xf6, 0xf2, 0xfb, 0xf9, /* 90-97 */
136 0xff, 0xd6, 0xdc, 0xf8, 0xa3, 0xd8, 0xd7, 0x3f, /* 98-9f */
137 0xe1, 0xed, 0xf3, 0xfa, 0xf1, 0xd1, 0xaa, 0xba, /* a0-a7 */
138 0xbf, 0xae, 0xac, 0xbd, 0xbc, 0xa1, 0xab, 0xbb, /* a8-af */
139 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xc1, 0xc2, 0xc0, /* b0-b7 */
140 0xa9, 0x3f, 0x3f, 0x3f, 0x3f, 0xa2, 0xa5, 0x3f, /* b8-bf */
141 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xe3, 0xc3, /* c0-c7 */
142 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0x3f, 0xa4, /* c8-cf */
143 0xf0, 0xd0, 0xca, 0xcb, 0xc8, 0x3f, 0xcd, 0xce, /* d0-d7 */
144 0xcf, 0x3f, 0x3f, 0x3f, 0x3f, 0xa6, 0xcc, 0x3f, /* d8-df */
145 0xd3, 0xdf, 0xd4, 0xd2, 0xf5, 0xd5, 0xb5, 0xfe, /* e0-e7 */
146 0xde, 0xda, 0xdb, 0xd9, 0xfd, 0xdd, 0xaf, 0x3f, /* e8-ef */
147 0xad, 0xb1, 0x3f, 0xbe, 0xb6, 0xa7, 0xf7, 0xb8, /* f0-f7 */
148 0xb0, 0xa8, 0xb7, 0xb9, 0xb3, 0xb2, 0x3f, 0x3f, /* f8-ff */
149 };
150
151 static const u_char
152 u2l[256] = {
153 /* tolower */
154 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
155 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
156 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
157 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
158 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
159 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
160 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
161 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
162 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
163 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
164 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
165 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
166 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
167 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
168 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
169 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
170 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
171 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
172 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
173 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
174 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
175 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
176 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
177 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
178 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
179 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
180 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
181 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
182 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
183 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
184 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
185 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
186 };
187
188 static const u_char
189 l2u[256] = {
190 /* toupper */
191 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 00-07 */
192 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 08-0f */
193 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 10-17 */
194 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 18-1f */
195 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 20-27 */
196 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 28-2f */
197 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 30-37 */
198 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 38-3f */
199 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 40-47 */
200 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 48-4f */
201 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 50-57 */
202 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 58-5f */
203 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 60-67 */
204 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 68-6f */
205 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 70-77 */
206 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 78-7f */
207 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 80-87 */
208 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 88-8f */
209 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 90-97 */
210 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 98-9f */
211 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* a0-a7 */
212 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* a8-af */
213 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* b0-b7 */
214 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* b8-bf */
215 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* c0-c7 */
216 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* c8-cf */
217 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xd7, /* d0-d7 */
218 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xdf, /* d8-df */
219 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* e0-e7 */
220 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* e8-ef */
221 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* f0-f7 */
222 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* f8-ff */
223 };
224
225 /*
226 * DOS filenames are made of 2 parts, the name part and the extension part.
227 * The name part is 8 characters long and the extension part is 3
228 * characters long. They may contain trailing blanks if the name or
229 * extension are not long enough to fill their respective fields.
230 */
231
232 /*
233 * Convert a DOS filename to a unix filename. And, return the number of
234 * characters in the resulting unix filename excluding the terminating
235 * null.
236 */
237 int
dos2unixfn(u_char dn[11],u_char * un,int lower,struct msdosfsmount * pmp)238 dos2unixfn(u_char dn[11], u_char *un, int lower, struct msdosfsmount *pmp)
239 {
240 size_t i;
241 int thislong = 0;
242 u_char *c, tmpbuf[5];
243
244 /*
245 * If first char of the filename is SLOT_E5 (0x05), then the real
246 * first char of the filename should be 0xe5. But, they couldn't
247 * just have a 0xe5 mean 0xe5 because that is used to mean a freed
248 * directory slot. Another dos quirk.
249 */
250 if (*dn == SLOT_E5)
251 *dn = 0xe5;
252
253 /*
254 * Copy the name portion into the unix filename string.
255 */
256 for (i = 8; i > 0 && *dn != ' ';) {
257 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn), &i,
258 lower & LCASE_BASE, pmp);
259 while (*c != '\0') {
260 *un++ = *c++;
261 thislong++;
262 }
263 }
264 dn += i;
265
266 /*
267 * Now, if there is an extension then put in a period and copy in
268 * the extension.
269 */
270 if (*dn != ' ') {
271 *un++ = '.';
272 thislong++;
273 for (i = 3; i > 0 && *dn != ' ';) {
274 c = dos2unixchr(tmpbuf, __DECONST(const u_char **, &dn),
275 &i, lower & LCASE_EXT, pmp);
276 while (*c != '\0') {
277 *un++ = *c++;
278 thislong++;
279 }
280 }
281 }
282 *un++ = 0;
283
284 return (thislong);
285 }
286
287 /*
288 * Convert a unix filename to a DOS filename according to Win95 rules.
289 * If applicable and gen is not 0, it is inserted into the converted
290 * filename as a generation number.
291 * Returns
292 * 0 if name couldn't be converted
293 * 1 if the converted name is the same as the original
294 * (no long filename entry necessary for Win95)
295 * 2 if conversion was successful
296 * 3 if conversion was successful and generation number was inserted
297 */
298 int
unix2dosfn(const u_char * un,u_char dn[12],size_t unlen,u_int gen,struct msdosfsmount * pmp)299 unix2dosfn(const u_char *un, u_char dn[12], size_t unlen, u_int gen,
300 struct msdosfsmount *pmp)
301 {
302 ssize_t i, j;
303 int l;
304 int conv = 1;
305 const u_char *cp, *dp, *dp1;
306 u_char gentext[6], *wcp;
307 uint16_t c;
308
309 /*
310 * Fill the dos filename string with blanks. These are DOS's pad
311 * characters.
312 */
313 for (i = 0; i < 11; i++)
314 dn[i] = ' ';
315 dn[11] = 0;
316
317 /*
318 * The filenames "." and ".." are handled specially, since they
319 * don't follow dos filename rules.
320 */
321 if (un[0] == '.' && unlen == 1) {
322 dn[0] = '.';
323 return gen <= 1;
324 }
325 if (un[0] == '.' && un[1] == '.' && unlen == 2) {
326 dn[0] = '.';
327 dn[1] = '.';
328 return gen <= 1;
329 }
330
331 /*
332 * Filenames with only blanks and dots are not allowed!
333 */
334 for (cp = un, i = unlen; --i >= 0; cp++)
335 if (*cp != ' ' && *cp != '.')
336 break;
337 if (i < 0)
338 return 0;
339
340 /*
341 * Filenames with some characters are not allowed!
342 */
343 for (cp = un, i = unlen; i > 0;)
344 if (unix2doschr(&cp, (size_t *)&i, pmp) == 0)
345 return 0;
346
347 /*
348 * Now find the extension
349 * Note: dot as first char doesn't start extension
350 * and trailing dots and blanks are ignored
351 * Note(2003/7): It seems recent Windows has
352 * defferent rule than this code, that Windows
353 * ignores all dots before extension, and use all
354 * chars as filename except for dots.
355 */
356 dp = dp1 = NULL;
357 for (cp = un + 1, i = unlen - 1; --i >= 0;) {
358 switch (*cp++) {
359 case '.':
360 if (!dp1)
361 dp1 = cp;
362 break;
363 case ' ':
364 break;
365 default:
366 if (dp1)
367 dp = dp1;
368 dp1 = NULL;
369 break;
370 }
371 }
372
373 /*
374 * Now convert it (this part is for extension).
375 * As Windows XP do, if it's not ascii char,
376 * this function should return 2 or 3, so that checkng out Unicode name.
377 */
378 if (dp) {
379 if (dp1)
380 l = dp1 - dp;
381 else
382 l = unlen - (dp - un);
383 for (cp = dp, i = l, j = 8; i > 0 && j < 11; j++) {
384 c = unix2doschr(&cp, (size_t *)&i, pmp);
385 if (c & 0xff00) {
386 dn[j] = c >> 8;
387 if (++j < 11) {
388 dn[j] = c;
389 if (conv != 3)
390 conv = 2;
391 continue;
392 } else {
393 conv = 3;
394 dn[j-1] = ' ';
395 break;
396 }
397 } else {
398 dn[j] = c;
399 }
400 if (((dn[j] & 0x80) || *(cp - 1) != dn[j]) && conv != 3)
401 conv = 2;
402 if (dn[j] == 1) {
403 conv = 3;
404 dn[j] = '_';
405 }
406 if (dn[j] == 2) {
407 conv = 3;
408 dn[j--] = ' ';
409 }
410 }
411 if (i > 0)
412 conv = 3;
413 dp--;
414 } else {
415 for (dp = cp; *--dp == ' ' || *dp == '.';);
416 dp++;
417 }
418
419 /*
420 * Now convert the rest of the name
421 */
422 for (i = dp - un, j = 0; un < dp && j < 8; j++) {
423 c = unix2doschr(&un, &i, pmp);
424 if (c & 0xff00) {
425 dn[j] = c >> 8;
426 if (++j < 8) {
427 dn[j] = c;
428 if (conv != 3)
429 conv = 2;
430 continue;
431 } else {
432 conv = 3;
433 dn[j-1] = ' ';
434 break;
435 }
436 } else {
437 dn[j] = c;
438 }
439 if (((dn[j] & 0x80) || *(un - 1) != dn[j]) && conv != 3)
440 conv = 2;
441 if (dn[j] == 1) {
442 conv = 3;
443 dn[j] = '_';
444 }
445 if (dn[j] == 2) {
446 conv = 3;
447 dn[j--] = ' ';
448 }
449 }
450 if (un < dp)
451 conv = 3;
452 /*
453 * If we didn't have any chars in filename,
454 * generate a default
455 */
456 if (!j)
457 dn[0] = '_';
458
459 /*
460 * If there wasn't any char dropped,
461 * there is no place for generation numbers
462 */
463 if (conv != 3) {
464 if (gen > 1)
465 conv = 0;
466 goto done;
467 }
468
469 /*
470 * Now insert the generation number into the filename part
471 */
472 if (gen == 0)
473 goto done;
474 for (wcp = gentext + sizeof(gentext); wcp > gentext && gen; gen /= 10)
475 *--wcp = gen % 10 + '0';
476 if (gen) {
477 conv = 0;
478 goto done;
479 }
480 for (i = 8; dn[--i] == ' ';);
481 i++;
482 if (gentext + sizeof(gentext) - wcp + 1 > 8 - i)
483 i = 8 - (gentext + sizeof(gentext) - wcp + 1);
484 /*
485 * Correct posision to where insert the generation number
486 */
487 cp = dn;
488 i -= mbsadjpos((const char**)&cp, i, unlen, 1, pmp->pm_flags, pmp->pm_d2u);
489
490 dn[i++] = '~';
491 while (wcp < gentext + sizeof(gentext))
492 dn[i++] = *wcp++;
493
494 /*
495 * Tail of the filename should be space
496 */
497 while (i < 8)
498 dn[i++] = ' ';
499 conv = 3;
500
501 done:
502 /*
503 * The first character cannot be E5,
504 * because that means a deleted entry
505 */
506 if (dn[0] == 0xe5)
507 dn[0] = SLOT_E5;
508
509 return conv;
510 }
511
512 /*
513 * Create a Win95 long name directory entry
514 * Note: assumes that the filename is valid,
515 * i.e. doesn't consist solely of blanks and dots
516 */
517 int
unix2winfn(const u_char * un,size_t unlen,struct winentry * wep,int cnt,int chksum,struct msdosfsmount * pmp)518 unix2winfn(const u_char *un, size_t unlen, struct winentry *wep, int cnt,
519 int chksum, struct msdosfsmount *pmp)
520 {
521 uint8_t *wcp;
522 int i, end;
523 uint16_t code;
524
525 /*
526 * Drop trailing blanks and dots
527 */
528 unlen = winLenFixup(un, unlen);
529
530 /*
531 * Cut *un for this slot
532 */
533 unlen = mbsadjpos((const char **)&un, unlen, (cnt - 1) * WIN_CHARS, 2,
534 pmp->pm_flags, pmp->pm_u2w);
535
536 /*
537 * Initialize winentry to some useful default
538 */
539 memset(wep, 0xff, sizeof(*wep));
540 wep->weCnt = cnt;
541 wep->weAttributes = ATTR_WIN95;
542 wep->weReserved1 = 0;
543 wep->weChksum = chksum;
544 wep->weReserved2 = 0;
545
546 /*
547 * Now convert the filename parts
548 */
549 end = 0;
550 for (wcp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0 && !end;) {
551 code = unix2winchr(&un, &unlen, 0, pmp);
552 *wcp++ = code;
553 *wcp++ = code >> 8;
554 if (!code)
555 end = WIN_LAST;
556 }
557 for (wcp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0 && !end;) {
558 code = unix2winchr(&un, &unlen, 0, pmp);
559 *wcp++ = code;
560 *wcp++ = code >> 8;
561 if (!code)
562 end = WIN_LAST;
563 }
564 for (wcp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0 && !end;) {
565 code = unix2winchr(&un, &unlen, 0, pmp);
566 *wcp++ = code;
567 *wcp++ = code >> 8;
568 if (!code)
569 end = WIN_LAST;
570 }
571 if (!unlen)
572 end = WIN_LAST;
573 wep->weCnt |= end;
574 return !end;
575 }
576
577 /*
578 * Compare our filename to the one in the Win95 entry
579 * Returns the checksum or -1 if no match
580 */
581 int
winChkName(struct mbnambuf * nbp,const u_char * un,size_t unlen,int chksum,struct msdosfsmount * pmp)582 winChkName(struct mbnambuf *nbp, const u_char *un, size_t unlen, int chksum,
583 struct msdosfsmount *pmp)
584 {
585 size_t len;
586 uint16_t c1, c2;
587 u_char *np;
588 struct dirent dirbuf;
589
590 /*
591 * We already have winentry in *nbp.
592 */
593 if (!mbnambuf_flush(nbp, &dirbuf) || dirbuf.d_namlen == 0)
594 return -1;
595
596 #ifdef MSDOSFS_DEBUG
597 printf("winChkName(): un=%s:%zu,d_name=%s:%d\n", un, unlen,
598 dirbuf.d_name,
599 dirbuf.d_namlen);
600 #endif
601
602 /*
603 * Compare the name parts
604 */
605 len = dirbuf.d_namlen;
606 if (unlen != len)
607 return -2;
608
609 for (np = dirbuf.d_name; unlen > 0 && len > 0;) {
610 /*
611 * Comparison must be case insensitive, because FAT disallows
612 * to look up or create files in case sensitive even when
613 * it's a long file name.
614 */
615 c1 = unix2winchr(__DECONST(const u_char **, &np), &len,
616 LCASE_BASE, pmp);
617 c2 = unix2winchr(&un, &unlen, LCASE_BASE, pmp);
618 if (c1 != c2)
619 return -2;
620 }
621 return chksum;
622 }
623
624 /*
625 * Convert Win95 filename to dirbuf.
626 * Returns the checksum or -1 if impossible
627 */
628 int
win2unixfn(struct mbnambuf * nbp,struct winentry * wep,int chksum,struct msdosfsmount * pmp)629 win2unixfn(struct mbnambuf *nbp, struct winentry *wep, int chksum,
630 struct msdosfsmount *pmp)
631 {
632 u_char *c, tmpbuf[5];
633 uint8_t *cp;
634 uint8_t *np, name[WIN_CHARS * 3 + 1];
635 uint16_t code;
636 int i;
637
638 if ((wep->weCnt&WIN_CNT) > howmany(WIN_MAXLEN, WIN_CHARS)
639 || !(wep->weCnt&WIN_CNT))
640 return -1;
641
642 /*
643 * First compare checksums
644 */
645 if (wep->weCnt&WIN_LAST) {
646 chksum = wep->weChksum;
647 } else if (chksum != wep->weChksum)
648 chksum = -1;
649 if (chksum == -1)
650 return -1;
651
652 /*
653 * Convert the name parts
654 */
655 np = name;
656 for (cp = wep->wePart1, i = sizeof(wep->wePart1)/2; --i >= 0;) {
657 code = (cp[1] << 8) | cp[0];
658 switch (code) {
659 case 0:
660 *np = '\0';
661 if (mbnambuf_write(nbp, name,
662 (wep->weCnt & WIN_CNT) - 1) != 0)
663 return -1;
664 return chksum;
665 case '/':
666 *np = '\0';
667 return -1;
668 default:
669 c = win2unixchr(tmpbuf, code, pmp);
670 while (*c != '\0')
671 *np++ = *c++;
672 break;
673 }
674 cp += 2;
675 }
676 for (cp = wep->wePart2, i = sizeof(wep->wePart2)/2; --i >= 0;) {
677 code = (cp[1] << 8) | cp[0];
678 switch (code) {
679 case 0:
680 *np = '\0';
681 if (mbnambuf_write(nbp, name,
682 (wep->weCnt & WIN_CNT) - 1) != 0)
683 return -1;
684 return chksum;
685 case '/':
686 *np = '\0';
687 return -1;
688 default:
689 c = win2unixchr(tmpbuf, code, pmp);
690 while (*c != '\0')
691 *np++ = *c++;
692 break;
693 }
694 cp += 2;
695 }
696 for (cp = wep->wePart3, i = sizeof(wep->wePart3)/2; --i >= 0;) {
697 code = (cp[1] << 8) | cp[0];
698 switch (code) {
699 case 0:
700 *np = '\0';
701 if (mbnambuf_write(nbp, name,
702 (wep->weCnt & WIN_CNT) - 1) != 0)
703 return -1;
704 return chksum;
705 case '/':
706 *np = '\0';
707 return -1;
708 default:
709 c = win2unixchr(tmpbuf, code, pmp);
710 while (*c != '\0')
711 *np++ = *c++;
712 break;
713 }
714 cp += 2;
715 }
716 *np = '\0';
717 if (mbnambuf_write(nbp, name, (wep->weCnt & WIN_CNT) - 1) != 0)
718 return -1;
719 return chksum;
720 }
721
722 /*
723 * Compute the unrolled checksum of a DOS filename for Win95 LFN use.
724 */
725 uint8_t
winChksum(uint8_t * name)726 winChksum(uint8_t *name)
727 {
728 int i;
729 uint8_t s;
730
731 for (s = 0, i = 11; --i >= 0; s += *name++)
732 s = (s << 7)|(s >> 1);
733 return (s);
734 }
735
736 /*
737 * Determine the number of slots necessary for Win95 names
738 */
739 int
winSlotCnt(const u_char * un,size_t unlen,struct msdosfsmount * pmp)740 winSlotCnt(const u_char *un, size_t unlen, struct msdosfsmount *pmp)
741 {
742 size_t wlen;
743 char wn[WIN_MAXLEN * 2 + 1], *wnp;
744
745 unlen = winLenFixup(un, unlen);
746
747 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
748 wlen = WIN_MAXLEN * 2;
749 wnp = wn;
750 msdosfs_iconv->conv(pmp->pm_u2w, (const char **)&un, &unlen, &wnp, &wlen);
751 if (unlen > 0)
752 return 0;
753 return howmany(WIN_MAXLEN - wlen/2, WIN_CHARS);
754 }
755
756 if (unlen > WIN_MAXLEN)
757 return 0;
758 return howmany(unlen, WIN_CHARS);
759 }
760
761 /*
762 * Determine the number of bytes necessary for Win95 names
763 */
764 size_t
winLenFixup(const u_char * un,size_t unlen)765 winLenFixup(const u_char *un, size_t unlen)
766 {
767 for (un += unlen; unlen > 0; unlen--)
768 if (*--un != ' ' && *un != '.')
769 break;
770 return unlen;
771 }
772
773 /*
774 * Store an area with multi byte string instr, and returns left
775 * byte of instr and moves pointer forward. The area's size is
776 * inlen or outlen.
777 */
778 static int
mbsadjpos(const char ** instr,size_t inlen,size_t outlen,int weight,int flag,void * handle)779 mbsadjpos(const char **instr, size_t inlen, size_t outlen, int weight, int flag, void *handle)
780 {
781 char *outp, outstr[outlen * weight + 1];
782
783 if (flag & MSDOSFSMNT_KICONV && msdosfs_iconv) {
784 outp = outstr;
785 outlen *= weight;
786 msdosfs_iconv->conv(handle, instr, &inlen, &outp, &outlen);
787 return (inlen);
788 }
789
790 (*instr) += min(inlen, outlen);
791 return (inlen - min(inlen, outlen));
792 }
793
794 /*
795 * Convert DOS char to Local char
796 */
797 static u_char *
dos2unixchr(u_char * outbuf,const u_char ** instr,size_t * ilen,int lower,struct msdosfsmount * pmp)798 dos2unixchr(u_char *outbuf, const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
799 {
800 u_char c, *outp, *outp1;
801 size_t i, len, olen;
802
803 outp = outbuf;
804 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
805 olen = len = 4;
806
807 outp1 = outp;
808 if (lower & (LCASE_BASE | LCASE_EXT))
809 msdosfs_iconv->convchr_case(pmp->pm_d2u, (const char **)instr,
810 ilen, (char **)&outp, &olen, KICONV_LOWER);
811 else
812 msdosfs_iconv->convchr(pmp->pm_d2u, (const char **)instr,
813 ilen, (char **)&outp, &olen);
814 for (i = 0; i < outp - outp1; i++) {
815 if (outp1[i] == '/')
816 outp1[i] = '?';
817 }
818 len -= olen;
819
820 /*
821 * return '?' if failed to convert
822 */
823 if (len == 0) {
824 (*ilen)--;
825 (*instr)++;
826 *outp++ = '?';
827 }
828 } else {
829 (*ilen)--;
830 c = *(*instr)++;
831 c = dos2unix[c];
832 if (lower & (LCASE_BASE | LCASE_EXT))
833 c = u2l[c];
834 if (c == '/')
835 c = '?';
836 *outp++ = c;
837 outbuf[1] = '\0';
838 }
839
840 *outp = '\0';
841 outp = outbuf;
842 return (outp);
843 }
844
845 /*
846 * Convert Local char to DOS char
847 */
848 static uint16_t
unix2doschr(const u_char ** instr,size_t * ilen,struct msdosfsmount * pmp)849 unix2doschr(const u_char **instr, size_t *ilen, struct msdosfsmount *pmp)
850 {
851 u_char c;
852 char *up, *outp, unicode[3], outbuf[3];
853 uint16_t wc;
854 size_t len, ucslen, unixlen, olen;
855
856 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
857 /*
858 * to hide an invisible character, using a unicode filter
859 */
860 ucslen = 2;
861 len = *ilen;
862 up = unicode;
863 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
864 ilen, &up, &ucslen);
865 unixlen = len - *ilen;
866
867 /*
868 * cannot be converted
869 */
870 if (unixlen == 0) {
871 (*ilen)--;
872 (*instr)++;
873 return (0);
874 }
875
876 /*
877 * return magic number for ascii char
878 */
879 if (unixlen == 1) {
880 c = *(*instr -1);
881 if (! (c & 0x80)) {
882 c = unix2dos[c];
883 if (c <= 2)
884 return (c);
885 }
886 }
887
888 /*
889 * now convert using libiconv
890 */
891 *instr -= unixlen;
892 *ilen = len;
893
894 olen = len = 2;
895 outp = outbuf;
896 msdosfs_iconv->convchr_case(pmp->pm_u2d, (const char **)instr,
897 ilen, &outp, &olen, KICONV_FROM_UPPER);
898 len -= olen;
899
900 /*
901 * cannot be converted, but has unicode char, should return magic number
902 */
903 if (len == 0) {
904 (*ilen) -= unixlen;
905 (*instr) += unixlen;
906 return (1);
907 }
908
909 wc = 0;
910 while(len--)
911 wc |= (*(outp - len - 1) & 0xff) << (len << 3);
912 return (wc);
913 }
914
915 (*ilen)--;
916 c = *(*instr)++;
917 c = l2u[c];
918 c = unix2dos[c];
919 return ((uint16_t)c);
920 }
921
922 /*
923 * Convert Windows char to Local char
924 */
925 static u_char *
win2unixchr(u_char * outbuf,uint16_t wc,struct msdosfsmount * pmp)926 win2unixchr(u_char *outbuf, uint16_t wc, struct msdosfsmount *pmp)
927 {
928 u_char *inp, *outp, inbuf[3];
929 size_t ilen, olen, len;
930
931 outp = outbuf;
932 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
933 inbuf[0] = (u_char)(wc>>8);
934 inbuf[1] = (u_char)wc;
935 inbuf[2] = '\0';
936
937 ilen = 2;
938 olen = len = 4;
939 inp = inbuf;
940 msdosfs_iconv->convchr(pmp->pm_w2u, __DECONST(const char **,
941 &inp), &ilen, (char **)&outp, &olen);
942 len -= olen;
943
944 /*
945 * return '?' if failed to convert
946 */
947 if (len == 0)
948 *outp++ = '?';
949 } else {
950 *outp++ = (wc & 0xff00) ? '?' : (u_char)(wc & 0xff);
951 }
952
953 *outp = '\0';
954 outp = outbuf;
955 return (outp);
956 }
957
958 /*
959 * Convert Local char to Windows char
960 */
961 static uint16_t
unix2winchr(const u_char ** instr,size_t * ilen,int lower,struct msdosfsmount * pmp)962 unix2winchr(const u_char **instr, size_t *ilen, int lower, struct msdosfsmount *pmp)
963 {
964 u_char *outp, outbuf[3];
965 uint16_t wc;
966 size_t olen;
967
968 if (*ilen == 0)
969 return (0);
970
971 if (pmp->pm_flags & MSDOSFSMNT_KICONV && msdosfs_iconv) {
972 outp = outbuf;
973 olen = 2;
974 if (lower & (LCASE_BASE | LCASE_EXT))
975 msdosfs_iconv->convchr_case(pmp->pm_u2w, (const char **)instr,
976 ilen, (char **)&outp, &olen,
977 KICONV_FROM_LOWER);
978 else
979 msdosfs_iconv->convchr(pmp->pm_u2w, (const char **)instr,
980 ilen, (char **)&outp, &olen);
981
982 /*
983 * return '0' if end of filename
984 */
985 if (olen == 2)
986 return (0);
987
988 wc = (outbuf[0]<<8) | outbuf[1];
989
990 return (wc);
991 }
992
993 (*ilen)--;
994 wc = (*instr)[0];
995 if (lower & (LCASE_BASE | LCASE_EXT))
996 wc = u2l[wc];
997 (*instr)++;
998 return (wc);
999 }
1000
1001 /*
1002 * Initialize the temporary concatenation buffer.
1003 */
1004 void
mbnambuf_init(struct mbnambuf * nbp)1005 mbnambuf_init(struct mbnambuf *nbp)
1006 {
1007
1008 nbp->nb_len = 0;
1009 nbp->nb_last_id = -1;
1010 nbp->nb_buf[sizeof(nbp->nb_buf) - 1] = '\0';
1011 }
1012
1013 /*
1014 * Fill out our concatenation buffer with the given substring, at the offset
1015 * specified by its id. Since this function must be called with ids in
1016 * descending order, we take advantage of the fact that ASCII substrings are
1017 * exactly WIN_CHARS in length. For non-ASCII substrings, we shift all
1018 * previous (i.e. higher id) substrings upwards to make room for this one.
1019 * This only penalizes portions of substrings that contain more than
1020 * WIN_CHARS bytes when they are first encountered.
1021 */
1022 int
mbnambuf_write(struct mbnambuf * nbp,char * name,int id)1023 mbnambuf_write(struct mbnambuf *nbp, char *name, int id)
1024 {
1025 char *slot;
1026 size_t count, newlen;
1027
1028 if (nbp->nb_len != 0 && id != nbp->nb_last_id - 1) {
1029 #ifdef MSDOSFS_DEBUG
1030 printf("msdosfs: non-decreasing id: id %d, last id %d\n",
1031 id, nbp->nb_last_id);
1032 #endif
1033 return (EINVAL);
1034 }
1035
1036 /* Will store this substring in a WIN_CHARS-aligned slot. */
1037 slot = &nbp->nb_buf[id * WIN_CHARS];
1038 count = strlen(name);
1039 newlen = nbp->nb_len + count;
1040 if (newlen > WIN_MAXLEN || newlen > MAXNAMLEN) {
1041 #ifdef MSDOSFS_DEBUG
1042 printf("msdosfs: file name length %zu too large\n", newlen);
1043 #endif
1044 return (ENAMETOOLONG);
1045 }
1046
1047 /* Shift suffix upwards by the amount length exceeds WIN_CHARS. */
1048 if (count > WIN_CHARS && nbp->nb_len != 0) {
1049 if ((id * WIN_CHARS + count + nbp->nb_len) >
1050 sizeof(nbp->nb_buf))
1051 return (ENAMETOOLONG);
1052
1053 memmove(slot + count, slot + WIN_CHARS, nbp->nb_len);
1054 }
1055
1056 /* Copy in the substring to its slot and update length so far. */
1057 memcpy(slot, name, count);
1058 nbp->nb_len = newlen;
1059 nbp->nb_last_id = id;
1060
1061 return (0);
1062 }
1063
1064 /*
1065 * Take the completed string and use it to setup the struct dirent.
1066 * Be sure to always nul-terminate the d_name and then copy the string
1067 * from our buffer. Note that this function assumes the full string has
1068 * been reassembled in the buffer. If it's called before all substrings
1069 * have been written via mbnambuf_write(), the result will be incorrect.
1070 */
1071 char *
mbnambuf_flush(struct mbnambuf * nbp,struct dirent * dp)1072 mbnambuf_flush(struct mbnambuf *nbp, struct dirent *dp)
1073 {
1074
1075 if (nbp->nb_len > sizeof(dp->d_name) - 1) {
1076 mbnambuf_init(nbp);
1077 return (NULL);
1078 }
1079 memcpy(dp->d_name, &nbp->nb_buf[0], nbp->nb_len);
1080 dp->d_name[nbp->nb_len] = '\0';
1081 dp->d_namlen = nbp->nb_len;
1082
1083 mbnambuf_init(nbp);
1084 return (dp->d_name);
1085 }
1086