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1da177e4 LT |
1 | /* |
2 | * fs/cifs/cifs_unicode.c | |
3 | * | |
d185cda7 | 4 | * Copyright (c) International Business Machines Corp., 2000,2009 |
1da177e4 LT |
5 | * Modified by Steve French (sfrench@us.ibm.com) |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
221601c3 | 9 | * the Free Software Foundation; either version 2 of the License, or |
1da177e4 | 10 | * (at your option) any later version. |
221601c3 | 11 | * |
1da177e4 LT |
12 | * This program is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
15 | * the GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
221601c3 | 18 | * along with this program; if not, write to the Free Software |
1da177e4 LT |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ | |
21 | #include <linux/fs.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
1da177e4 LT |
23 | #include "cifs_unicode.h" |
24 | #include "cifs_uniupr.h" | |
25 | #include "cifspdu.h" | |
3979877e | 26 | #include "cifsglob.h" |
1da177e4 LT |
27 | #include "cifs_debug.h" |
28 | ||
69f801fc JL |
29 | /* |
30 | * cifs_ucs2_bytes - how long will a string be after conversion? | |
31 | * @ucs - pointer to input string | |
32 | * @maxbytes - don't go past this many bytes of input string | |
33 | * @codepage - destination codepage | |
34 | * | |
35 | * Walk a ucs2le string and return the number of bytes that the string will | |
36 | * be after being converted to the given charset, not including any null | |
37 | * termination required. Don't walk past maxbytes in the source buffer. | |
38 | */ | |
39 | int | |
40 | cifs_ucs2_bytes(const __le16 *from, int maxbytes, | |
41 | const struct nls_table *codepage) | |
42 | { | |
43 | int i; | |
44 | int charlen, outlen = 0; | |
45 | int maxwords = maxbytes / 2; | |
46 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
ba2dbf30 | 47 | __u16 ftmp; |
69f801fc | 48 | |
ba2dbf30 JL |
49 | for (i = 0; i < maxwords; i++) { |
50 | ftmp = get_unaligned_le16(&from[i]); | |
51 | if (ftmp == 0) | |
52 | break; | |
53 | ||
54 | charlen = codepage->uni2char(ftmp, tmp, NLS_MAX_CHARSET_SIZE); | |
69f801fc JL |
55 | if (charlen > 0) |
56 | outlen += charlen; | |
57 | else | |
58 | outlen++; | |
59 | } | |
60 | ||
61 | return outlen; | |
62 | } | |
63 | ||
7fabf0c9 | 64 | /* |
ba2dbf30 | 65 | * cifs_mapchar - convert a host-endian char to proper char in codepage |
7fabf0c9 | 66 | * @target - where converted character should be copied |
ba2dbf30 | 67 | * @src_char - 2 byte host-endian source character |
7fabf0c9 JL |
68 | * @cp - codepage to which character should be converted |
69 | * @mapchar - should character be mapped according to mapchars mount option? | |
70 | * | |
71 | * This function handles the conversion of a single character. It is the | |
72 | * responsibility of the caller to ensure that the target buffer is large | |
73 | * enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE). | |
74 | */ | |
75 | static int | |
ba2dbf30 | 76 | cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp, |
7fabf0c9 JL |
77 | bool mapchar) |
78 | { | |
79 | int len = 1; | |
80 | ||
81 | if (!mapchar) | |
82 | goto cp_convert; | |
83 | ||
84 | /* | |
85 | * BB: Cannot handle remapping UNI_SLASH until all the calls to | |
86 | * build_path_from_dentry are modified, as they use slash as | |
87 | * separator. | |
88 | */ | |
ba2dbf30 | 89 | switch (src_char) { |
7fabf0c9 JL |
90 | case UNI_COLON: |
91 | *target = ':'; | |
92 | break; | |
581ade4d | 93 | case UNI_ASTERISK: |
7fabf0c9 JL |
94 | *target = '*'; |
95 | break; | |
96 | case UNI_QUESTION: | |
97 | *target = '?'; | |
98 | break; | |
99 | case UNI_PIPE: | |
100 | *target = '|'; | |
101 | break; | |
102 | case UNI_GRTRTHAN: | |
103 | *target = '>'; | |
104 | break; | |
105 | case UNI_LESSTHAN: | |
106 | *target = '<'; | |
107 | break; | |
108 | default: | |
109 | goto cp_convert; | |
110 | } | |
111 | ||
112 | out: | |
113 | return len; | |
114 | ||
115 | cp_convert: | |
ba2dbf30 | 116 | len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE); |
7fabf0c9 JL |
117 | if (len <= 0) { |
118 | *target = '?'; | |
119 | len = 1; | |
120 | } | |
121 | goto out; | |
122 | } | |
123 | ||
124 | /* | |
125 | * cifs_from_ucs2 - convert utf16le string to local charset | |
126 | * @to - destination buffer | |
127 | * @from - source buffer | |
128 | * @tolen - destination buffer size (in bytes) | |
129 | * @fromlen - source buffer size (in bytes) | |
130 | * @codepage - codepage to which characters should be converted | |
131 | * @mapchar - should characters be remapped according to the mapchars option? | |
132 | * | |
133 | * Convert a little-endian ucs2le string (as sent by the server) to a string | |
134 | * in the provided codepage. The tolen and fromlen parameters are to ensure | |
135 | * that the code doesn't walk off of the end of the buffer (which is always | |
136 | * a danger if the alignment of the source buffer is off). The destination | |
137 | * string is always properly null terminated and fits in the destination | |
138 | * buffer. Returns the length of the destination string in bytes (including | |
139 | * null terminator). | |
140 | * | |
141 | * Note that some windows versions actually send multiword UTF-16 characters | |
142 | * instead of straight UCS-2. The linux nls routines however aren't able to | |
143 | * deal with those characters properly. In the event that we get some of | |
144 | * those characters, they won't be translated properly. | |
145 | */ | |
146 | int | |
147 | cifs_from_ucs2(char *to, const __le16 *from, int tolen, int fromlen, | |
148 | const struct nls_table *codepage, bool mapchar) | |
149 | { | |
150 | int i, charlen, safelen; | |
151 | int outlen = 0; | |
152 | int nullsize = nls_nullsize(codepage); | |
153 | int fromwords = fromlen / 2; | |
154 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
ba2dbf30 | 155 | __u16 ftmp; |
7fabf0c9 JL |
156 | |
157 | /* | |
158 | * because the chars can be of varying widths, we need to take care | |
159 | * not to overflow the destination buffer when we get close to the | |
160 | * end of it. Until we get to this offset, we don't need to check | |
161 | * for overflow however. | |
162 | */ | |
163 | safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize); | |
164 | ||
ba2dbf30 JL |
165 | for (i = 0; i < fromwords; i++) { |
166 | ftmp = get_unaligned_le16(&from[i]); | |
167 | if (ftmp == 0) | |
168 | break; | |
169 | ||
7fabf0c9 JL |
170 | /* |
171 | * check to see if converting this character might make the | |
172 | * conversion bleed into the null terminator | |
173 | */ | |
174 | if (outlen >= safelen) { | |
ba2dbf30 | 175 | charlen = cifs_mapchar(tmp, ftmp, codepage, mapchar); |
7fabf0c9 JL |
176 | if ((outlen + charlen) > (tolen - nullsize)) |
177 | break; | |
178 | } | |
179 | ||
180 | /* put converted char into 'to' buffer */ | |
ba2dbf30 | 181 | charlen = cifs_mapchar(&to[outlen], ftmp, codepage, mapchar); |
7fabf0c9 JL |
182 | outlen += charlen; |
183 | } | |
184 | ||
185 | /* properly null-terminate string */ | |
186 | for (i = 0; i < nullsize; i++) | |
187 | to[outlen++] = 0; | |
188 | ||
189 | return outlen; | |
190 | } | |
191 | ||
1da177e4 LT |
192 | /* |
193 | * NAME: cifs_strtoUCS() | |
194 | * | |
195 | * FUNCTION: Convert character string to unicode string | |
196 | * | |
197 | */ | |
198 | int | |
ad7a2926 | 199 | cifs_strtoUCS(__le16 *to, const char *from, int len, |
1da177e4 LT |
200 | const struct nls_table *codepage) |
201 | { | |
202 | int charlen; | |
203 | int i; | |
ba2dbf30 | 204 | wchar_t wchar_to; /* needed to quiet sparse */ |
1da177e4 LT |
205 | |
206 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { | |
ba2dbf30 | 207 | charlen = codepage->char2uni(from, len, &wchar_to); |
1da177e4 | 208 | if (charlen < 1) { |
ba2dbf30 JL |
209 | cERROR(1, "strtoUCS: char2uni of 0x%x returned %d", |
210 | *from, charlen); | |
69114089 | 211 | /* A question mark */ |
ba2dbf30 | 212 | wchar_to = 0x003f; |
1da177e4 | 213 | charlen = 1; |
ba2dbf30 JL |
214 | } |
215 | put_unaligned_le16(wchar_to, &to[i]); | |
1da177e4 LT |
216 | } |
217 | ||
ba2dbf30 | 218 | put_unaligned_le16(0, &to[i]); |
1da177e4 LT |
219 | return i; |
220 | } | |
221 | ||
066ce689 | 222 | /* |
d185cda7 | 223 | * cifs_strndup_from_ucs - copy a string from wire format to the local codepage |
066ce689 JL |
224 | * @src - source string |
225 | * @maxlen - don't walk past this many bytes in the source string | |
226 | * @is_unicode - is this a unicode string? | |
227 | * @codepage - destination codepage | |
228 | * | |
229 | * Take a string given by the server, convert it to the local codepage and | |
230 | * put it in a new buffer. Returns a pointer to the new string or NULL on | |
231 | * error. | |
232 | */ | |
233 | char * | |
d185cda7 | 234 | cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode, |
066ce689 JL |
235 | const struct nls_table *codepage) |
236 | { | |
237 | int len; | |
238 | char *dst; | |
239 | ||
240 | if (is_unicode) { | |
241 | len = cifs_ucs2_bytes((__le16 *) src, maxlen, codepage); | |
242 | len += nls_nullsize(codepage); | |
243 | dst = kmalloc(len, GFP_KERNEL); | |
244 | if (!dst) | |
245 | return NULL; | |
246 | cifs_from_ucs2(dst, (__le16 *) src, len, maxlen, codepage, | |
247 | false); | |
248 | } else { | |
249 | len = strnlen(src, maxlen); | |
250 | len++; | |
251 | dst = kmalloc(len, GFP_KERNEL); | |
252 | if (!dst) | |
253 | return NULL; | |
254 | strlcpy(dst, src, len); | |
255 | } | |
256 | ||
257 | return dst; | |
258 | } | |
259 | ||
84cdf74e JL |
260 | /* |
261 | * Convert 16 bit Unicode pathname to wire format from string in current code | |
262 | * page. Conversion may involve remapping up the six characters that are | |
263 | * only legal in POSIX-like OS (if they are present in the string). Path | |
264 | * names are little endian 16 bit Unicode on the wire | |
265 | */ | |
266 | int | |
581ade4d | 267 | cifsConvertToUCS(__le16 *target, const char *source, int srclen, |
84cdf74e JL |
268 | const struct nls_table *cp, int mapChars) |
269 | { | |
270 | int i, j, charlen; | |
84cdf74e | 271 | char src_char; |
581ade4d JL |
272 | __le16 dst_char; |
273 | wchar_t tmp; | |
84cdf74e JL |
274 | |
275 | if (!mapChars) | |
276 | return cifs_strtoUCS(target, source, PATH_MAX, cp); | |
277 | ||
581ade4d | 278 | for (i = 0, j = 0; i < srclen; j++) { |
84cdf74e | 279 | src_char = source[i]; |
11379b5e | 280 | charlen = 1; |
84cdf74e JL |
281 | switch (src_char) { |
282 | case 0: | |
581ade4d | 283 | put_unaligned(0, &target[j]); |
84cdf74e JL |
284 | goto ctoUCS_out; |
285 | case ':': | |
581ade4d | 286 | dst_char = cpu_to_le16(UNI_COLON); |
84cdf74e JL |
287 | break; |
288 | case '*': | |
581ade4d | 289 | dst_char = cpu_to_le16(UNI_ASTERISK); |
84cdf74e JL |
290 | break; |
291 | case '?': | |
581ade4d | 292 | dst_char = cpu_to_le16(UNI_QUESTION); |
84cdf74e JL |
293 | break; |
294 | case '<': | |
581ade4d | 295 | dst_char = cpu_to_le16(UNI_LESSTHAN); |
84cdf74e JL |
296 | break; |
297 | case '>': | |
581ade4d | 298 | dst_char = cpu_to_le16(UNI_GRTRTHAN); |
84cdf74e JL |
299 | break; |
300 | case '|': | |
581ade4d | 301 | dst_char = cpu_to_le16(UNI_PIPE); |
84cdf74e JL |
302 | break; |
303 | /* | |
304 | * FIXME: We can not handle remapping backslash (UNI_SLASH) | |
305 | * until all the calls to build_path_from_dentry are modified, | |
306 | * as they use backslash as separator. | |
307 | */ | |
308 | default: | |
581ade4d JL |
309 | charlen = cp->char2uni(source + i, srclen - i, &tmp); |
310 | dst_char = cpu_to_le16(tmp); | |
311 | ||
84cdf74e JL |
312 | /* |
313 | * if no match, use question mark, which at least in | |
314 | * some cases serves as wild card | |
315 | */ | |
316 | if (charlen < 1) { | |
581ade4d | 317 | dst_char = cpu_to_le16(0x003f); |
84cdf74e JL |
318 | charlen = 1; |
319 | } | |
84cdf74e | 320 | } |
11379b5e JL |
321 | /* |
322 | * character may take more than one byte in the source string, | |
323 | * but will take exactly two bytes in the target string | |
324 | */ | |
325 | i += charlen; | |
581ade4d | 326 | put_unaligned(dst_char, &target[j]); |
84cdf74e JL |
327 | } |
328 | ||
329 | ctoUCS_out: | |
330 | return i; | |
331 | } | |
332 |