Commit | Line | Data |
---|---|---|
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> |
2baa2682 | 23 | #include "cifs_fs_sb.h" |
1da177e4 LT |
24 | #include "cifs_unicode.h" |
25 | #include "cifs_uniupr.h" | |
26 | #include "cifspdu.h" | |
3979877e | 27 | #include "cifsglob.h" |
1da177e4 LT |
28 | #include "cifs_debug.h" |
29 | ||
2baa2682 SF |
30 | int cifs_remap(struct cifs_sb_info *cifs_sb) |
31 | { | |
32 | int map_type; | |
33 | ||
34 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) | |
35 | map_type = SFM_MAP_UNI_RSVD; | |
36 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
37 | map_type = SFU_MAP_UNI_RSVD; | |
38 | else | |
39 | map_type = NO_MAP_UNI_RSVD; | |
40 | ||
41 | return map_type; | |
42 | } | |
43 | ||
b693855f SF |
44 | /* Convert character using the SFU - "Services for Unix" remapping range */ |
45 | static bool | |
46 | convert_sfu_char(const __u16 src_char, char *target) | |
7fabf0c9 | 47 | { |
7fabf0c9 JL |
48 | /* |
49 | * BB: Cannot handle remapping UNI_SLASH until all the calls to | |
50 | * build_path_from_dentry are modified, as they use slash as | |
51 | * separator. | |
52 | */ | |
ba2dbf30 | 53 | switch (src_char) { |
7fabf0c9 JL |
54 | case UNI_COLON: |
55 | *target = ':'; | |
56 | break; | |
581ade4d | 57 | case UNI_ASTERISK: |
7fabf0c9 JL |
58 | *target = '*'; |
59 | break; | |
60 | case UNI_QUESTION: | |
61 | *target = '?'; | |
62 | break; | |
63 | case UNI_PIPE: | |
64 | *target = '|'; | |
65 | break; | |
66 | case UNI_GRTRTHAN: | |
67 | *target = '>'; | |
68 | break; | |
69 | case UNI_LESSTHAN: | |
70 | *target = '<'; | |
71 | break; | |
72 | default: | |
b693855f | 73 | return false; |
7fabf0c9 | 74 | } |
b693855f SF |
75 | return true; |
76 | } | |
7fabf0c9 | 77 | |
b693855f SF |
78 | /* Convert character using the SFM - "Services for Mac" remapping range */ |
79 | static bool | |
80 | convert_sfm_char(const __u16 src_char, char *target) | |
81 | { | |
82 | switch (src_char) { | |
83 | case SFM_COLON: | |
84 | *target = ':'; | |
85 | break; | |
86 | case SFM_ASTERISK: | |
87 | *target = '*'; | |
88 | break; | |
89 | case SFM_QUESTION: | |
90 | *target = '?'; | |
91 | break; | |
92 | case SFM_PIPE: | |
93 | *target = '|'; | |
94 | break; | |
95 | case SFM_GRTRTHAN: | |
96 | *target = '>'; | |
97 | break; | |
98 | case SFM_LESSTHAN: | |
99 | *target = '<'; | |
100 | break; | |
101 | case SFM_SLASH: | |
102 | *target = '\\'; | |
103 | break; | |
45e8a258 SF |
104 | case SFM_SPACE: |
105 | *target = ' '; | |
106 | break; | |
107 | case SFM_PERIOD: | |
108 | *target = '.'; | |
109 | break; | |
b693855f SF |
110 | default: |
111 | return false; | |
112 | } | |
113 | return true; | |
114 | } | |
115 | ||
116 | ||
117 | /* | |
118 | * cifs_mapchar - convert a host-endian char to proper char in codepage | |
119 | * @target - where converted character should be copied | |
120 | * @src_char - 2 byte host-endian source character | |
121 | * @cp - codepage to which character should be converted | |
122 | * @map_type - How should the 7 NTFS/SMB reserved characters be mapped to UCS2? | |
123 | * | |
124 | * This function handles the conversion of a single character. It is the | |
125 | * responsibility of the caller to ensure that the target buffer is large | |
126 | * enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE). | |
127 | */ | |
128 | static int | |
b2910307 | 129 | cifs_mapchar(char *target, const __u16 *from, const struct nls_table *cp, |
b693855f SF |
130 | int maptype) |
131 | { | |
132 | int len = 1; | |
b2910307 NA |
133 | __u16 src_char; |
134 | ||
135 | src_char = *from; | |
b693855f SF |
136 | |
137 | if ((maptype == SFM_MAP_UNI_RSVD) && convert_sfm_char(src_char, target)) | |
138 | return len; | |
139 | else if ((maptype == SFU_MAP_UNI_RSVD) && | |
140 | convert_sfu_char(src_char, target)) | |
141 | return len; | |
7fabf0c9 | 142 | |
b693855f | 143 | /* if character not one of seven in special remap set */ |
ba2dbf30 | 144 | len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE); |
b2910307 NA |
145 | if (len <= 0) |
146 | goto surrogate_pair; | |
147 | ||
148 | return len; | |
149 | ||
150 | surrogate_pair: | |
151 | /* convert SURROGATE_PAIR and IVS */ | |
152 | if (strcmp(cp->charset, "utf8")) | |
153 | goto unknown; | |
154 | len = utf16s_to_utf8s(from, 3, UTF16_LITTLE_ENDIAN, target, 6); | |
155 | if (len <= 0) | |
156 | goto unknown; | |
157 | return len; | |
158 | ||
159 | unknown: | |
160 | *target = '?'; | |
161 | len = 1; | |
b693855f | 162 | return len; |
7fabf0c9 JL |
163 | } |
164 | ||
165 | /* | |
acbbb76a | 166 | * cifs_from_utf16 - convert utf16le string to local charset |
7fabf0c9 JL |
167 | * @to - destination buffer |
168 | * @from - source buffer | |
169 | * @tolen - destination buffer size (in bytes) | |
170 | * @fromlen - source buffer size (in bytes) | |
171 | * @codepage - codepage to which characters should be converted | |
172 | * @mapchar - should characters be remapped according to the mapchars option? | |
173 | * | |
acbbb76a | 174 | * Convert a little-endian utf16le string (as sent by the server) to a string |
7fabf0c9 JL |
175 | * in the provided codepage. The tolen and fromlen parameters are to ensure |
176 | * that the code doesn't walk off of the end of the buffer (which is always | |
177 | * a danger if the alignment of the source buffer is off). The destination | |
178 | * string is always properly null terminated and fits in the destination | |
179 | * buffer. Returns the length of the destination string in bytes (including | |
180 | * null terminator). | |
181 | * | |
182 | * Note that some windows versions actually send multiword UTF-16 characters | |
acbbb76a | 183 | * instead of straight UTF16-2. The linux nls routines however aren't able to |
7fabf0c9 JL |
184 | * deal with those characters properly. In the event that we get some of |
185 | * those characters, they won't be translated properly. | |
186 | */ | |
187 | int | |
acbbb76a | 188 | cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen, |
b693855f | 189 | const struct nls_table *codepage, int map_type) |
7fabf0c9 JL |
190 | { |
191 | int i, charlen, safelen; | |
192 | int outlen = 0; | |
193 | int nullsize = nls_nullsize(codepage); | |
194 | int fromwords = fromlen / 2; | |
195 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
b2910307 | 196 | __u16 ftmp[3]; /* ftmp[3] = 3array x 2bytes = 6bytes UTF-16 */ |
7fabf0c9 JL |
197 | |
198 | /* | |
199 | * because the chars can be of varying widths, we need to take care | |
200 | * not to overflow the destination buffer when we get close to the | |
201 | * end of it. Until we get to this offset, we don't need to check | |
202 | * for overflow however. | |
203 | */ | |
204 | safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize); | |
205 | ||
ba2dbf30 | 206 | for (i = 0; i < fromwords; i++) { |
b2910307 NA |
207 | ftmp[0] = get_unaligned_le16(&from[i]); |
208 | if (ftmp[0] == 0) | |
ba2dbf30 | 209 | break; |
b2910307 NA |
210 | if (i + 1 < fromwords) |
211 | ftmp[1] = get_unaligned_le16(&from[i + 1]); | |
212 | else | |
213 | ftmp[1] = 0; | |
214 | if (i + 2 < fromwords) | |
215 | ftmp[2] = get_unaligned_le16(&from[i + 2]); | |
216 | else | |
217 | ftmp[2] = 0; | |
ba2dbf30 | 218 | |
7fabf0c9 JL |
219 | /* |
220 | * check to see if converting this character might make the | |
221 | * conversion bleed into the null terminator | |
222 | */ | |
223 | if (outlen >= safelen) { | |
b693855f | 224 | charlen = cifs_mapchar(tmp, ftmp, codepage, map_type); |
7fabf0c9 JL |
225 | if ((outlen + charlen) > (tolen - nullsize)) |
226 | break; | |
227 | } | |
228 | ||
229 | /* put converted char into 'to' buffer */ | |
b693855f | 230 | charlen = cifs_mapchar(&to[outlen], ftmp, codepage, map_type); |
7fabf0c9 | 231 | outlen += charlen; |
b2910307 NA |
232 | |
233 | /* charlen (=bytes of UTF-8 for 1 character) | |
234 | * 4bytes UTF-8(surrogate pair) is charlen=4 | |
235 | * (4bytes UTF-16 code) | |
236 | * 7-8bytes UTF-8(IVS) is charlen=3+4 or 4+4 | |
237 | * (2 UTF-8 pairs divided to 2 UTF-16 pairs) */ | |
238 | if (charlen == 4) | |
239 | i++; | |
240 | else if (charlen >= 5) | |
241 | /* 5-6bytes UTF-8 */ | |
242 | i += 2; | |
7fabf0c9 JL |
243 | } |
244 | ||
245 | /* properly null-terminate string */ | |
246 | for (i = 0; i < nullsize; i++) | |
247 | to[outlen++] = 0; | |
248 | ||
249 | return outlen; | |
250 | } | |
251 | ||
1da177e4 | 252 | /* |
acbbb76a | 253 | * NAME: cifs_strtoUTF16() |
1da177e4 LT |
254 | * |
255 | * FUNCTION: Convert character string to unicode string | |
256 | * | |
257 | */ | |
258 | int | |
acbbb76a | 259 | cifs_strtoUTF16(__le16 *to, const char *from, int len, |
1da177e4 LT |
260 | const struct nls_table *codepage) |
261 | { | |
262 | int charlen; | |
263 | int i; | |
ba2dbf30 | 264 | wchar_t wchar_to; /* needed to quiet sparse */ |
1da177e4 | 265 | |
fd3ba42c FZ |
266 | /* special case for utf8 to handle no plane0 chars */ |
267 | if (!strcmp(codepage->charset, "utf8")) { | |
268 | /* | |
269 | * convert utf8 -> utf16, we assume we have enough space | |
270 | * as caller should have assumed conversion does not overflow | |
271 | * in destination len is length in wchar_t units (16bits) | |
272 | */ | |
273 | i = utf8s_to_utf16s(from, len, UTF16_LITTLE_ENDIAN, | |
274 | (wchar_t *) to, len); | |
275 | ||
276 | /* if success terminate and exit */ | |
277 | if (i >= 0) | |
278 | goto success; | |
279 | /* | |
280 | * if fails fall back to UCS encoding as this | |
281 | * function should not return negative values | |
282 | * currently can fail only if source contains | |
283 | * invalid encoded characters | |
284 | */ | |
285 | } | |
286 | ||
1da177e4 | 287 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { |
ba2dbf30 | 288 | charlen = codepage->char2uni(from, len, &wchar_to); |
1da177e4 | 289 | if (charlen < 1) { |
f96637be JP |
290 | cifs_dbg(VFS, "strtoUTF16: char2uni of 0x%x returned %d\n", |
291 | *from, charlen); | |
69114089 | 292 | /* A question mark */ |
ba2dbf30 | 293 | wchar_to = 0x003f; |
1da177e4 | 294 | charlen = 1; |
ba2dbf30 JL |
295 | } |
296 | put_unaligned_le16(wchar_to, &to[i]); | |
1da177e4 LT |
297 | } |
298 | ||
fd3ba42c | 299 | success: |
ba2dbf30 | 300 | put_unaligned_le16(0, &to[i]); |
1da177e4 LT |
301 | return i; |
302 | } | |
303 | ||
b2910307 NA |
304 | /* |
305 | * cifs_utf16_bytes - how long will a string be after conversion? | |
306 | * @utf16 - pointer to input string | |
307 | * @maxbytes - don't go past this many bytes of input string | |
308 | * @codepage - destination codepage | |
309 | * | |
310 | * Walk a utf16le string and return the number of bytes that the string will | |
311 | * be after being converted to the given charset, not including any null | |
312 | * termination required. Don't walk past maxbytes in the source buffer. | |
313 | */ | |
314 | int | |
315 | cifs_utf16_bytes(const __le16 *from, int maxbytes, | |
316 | const struct nls_table *codepage) | |
317 | { | |
318 | int i; | |
319 | int charlen, outlen = 0; | |
320 | int maxwords = maxbytes / 2; | |
321 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
322 | __u16 ftmp[3]; | |
323 | ||
324 | for (i = 0; i < maxwords; i++) { | |
325 | ftmp[0] = get_unaligned_le16(&from[i]); | |
326 | if (ftmp[0] == 0) | |
327 | break; | |
328 | if (i + 1 < maxwords) | |
329 | ftmp[1] = get_unaligned_le16(&from[i + 1]); | |
330 | else | |
331 | ftmp[1] = 0; | |
332 | if (i + 2 < maxwords) | |
333 | ftmp[2] = get_unaligned_le16(&from[i + 2]); | |
334 | else | |
335 | ftmp[2] = 0; | |
336 | ||
337 | charlen = cifs_mapchar(tmp, ftmp, codepage, NO_MAP_UNI_RSVD); | |
338 | outlen += charlen; | |
339 | } | |
340 | ||
341 | return outlen; | |
342 | } | |
343 | ||
066ce689 | 344 | /* |
acbbb76a SF |
345 | * cifs_strndup_from_utf16 - copy a string from wire format to the local |
346 | * codepage | |
066ce689 JL |
347 | * @src - source string |
348 | * @maxlen - don't walk past this many bytes in the source string | |
349 | * @is_unicode - is this a unicode string? | |
350 | * @codepage - destination codepage | |
351 | * | |
352 | * Take a string given by the server, convert it to the local codepage and | |
353 | * put it in a new buffer. Returns a pointer to the new string or NULL on | |
354 | * error. | |
355 | */ | |
356 | char * | |
acbbb76a SF |
357 | cifs_strndup_from_utf16(const char *src, const int maxlen, |
358 | const bool is_unicode, const struct nls_table *codepage) | |
066ce689 JL |
359 | { |
360 | int len; | |
361 | char *dst; | |
362 | ||
363 | if (is_unicode) { | |
acbbb76a | 364 | len = cifs_utf16_bytes((__le16 *) src, maxlen, codepage); |
066ce689 JL |
365 | len += nls_nullsize(codepage); |
366 | dst = kmalloc(len, GFP_KERNEL); | |
367 | if (!dst) | |
368 | return NULL; | |
acbbb76a | 369 | cifs_from_utf16(dst, (__le16 *) src, len, maxlen, codepage, |
b693855f | 370 | NO_MAP_UNI_RSVD); |
066ce689 JL |
371 | } else { |
372 | len = strnlen(src, maxlen); | |
373 | len++; | |
374 | dst = kmalloc(len, GFP_KERNEL); | |
375 | if (!dst) | |
376 | return NULL; | |
377 | strlcpy(dst, src, len); | |
378 | } | |
379 | ||
380 | return dst; | |
381 | } | |
382 | ||
a4153cb1 SF |
383 | static __le16 convert_to_sfu_char(char src_char) |
384 | { | |
385 | __le16 dest_char; | |
386 | ||
387 | switch (src_char) { | |
388 | case ':': | |
389 | dest_char = cpu_to_le16(UNI_COLON); | |
390 | break; | |
391 | case '*': | |
392 | dest_char = cpu_to_le16(UNI_ASTERISK); | |
393 | break; | |
394 | case '?': | |
395 | dest_char = cpu_to_le16(UNI_QUESTION); | |
396 | break; | |
397 | case '<': | |
398 | dest_char = cpu_to_le16(UNI_LESSTHAN); | |
399 | break; | |
400 | case '>': | |
401 | dest_char = cpu_to_le16(UNI_GRTRTHAN); | |
402 | break; | |
403 | case '|': | |
404 | dest_char = cpu_to_le16(UNI_PIPE); | |
405 | break; | |
406 | default: | |
407 | dest_char = 0; | |
408 | } | |
409 | ||
410 | return dest_char; | |
411 | } | |
412 | ||
45e8a258 | 413 | static __le16 convert_to_sfm_char(char src_char, bool end_of_string) |
a4153cb1 SF |
414 | { |
415 | __le16 dest_char; | |
416 | ||
417 | switch (src_char) { | |
418 | case ':': | |
419 | dest_char = cpu_to_le16(SFM_COLON); | |
420 | break; | |
421 | case '*': | |
422 | dest_char = cpu_to_le16(SFM_ASTERISK); | |
423 | break; | |
424 | case '?': | |
425 | dest_char = cpu_to_le16(SFM_QUESTION); | |
426 | break; | |
427 | case '<': | |
428 | dest_char = cpu_to_le16(SFM_LESSTHAN); | |
429 | break; | |
430 | case '>': | |
431 | dest_char = cpu_to_le16(SFM_GRTRTHAN); | |
432 | break; | |
433 | case '|': | |
434 | dest_char = cpu_to_le16(SFM_PIPE); | |
435 | break; | |
45e8a258 SF |
436 | case '.': |
437 | if (end_of_string) | |
438 | dest_char = cpu_to_le16(SFM_PERIOD); | |
439 | else | |
440 | dest_char = 0; | |
441 | break; | |
442 | case ' ': | |
443 | if (end_of_string) | |
444 | dest_char = cpu_to_le16(SFM_SPACE); | |
445 | else | |
446 | dest_char = 0; | |
447 | break; | |
a4153cb1 SF |
448 | default: |
449 | dest_char = 0; | |
450 | } | |
451 | ||
452 | return dest_char; | |
453 | } | |
454 | ||
84cdf74e JL |
455 | /* |
456 | * Convert 16 bit Unicode pathname to wire format from string in current code | |
457 | * page. Conversion may involve remapping up the six characters that are | |
458 | * only legal in POSIX-like OS (if they are present in the string). Path | |
459 | * names are little endian 16 bit Unicode on the wire | |
460 | */ | |
461 | int | |
acbbb76a | 462 | cifsConvertToUTF16(__le16 *target, const char *source, int srclen, |
a4153cb1 | 463 | const struct nls_table *cp, int map_chars) |
84cdf74e | 464 | { |
ce36d9ab SF |
465 | int i, charlen; |
466 | int j = 0; | |
84cdf74e | 467 | char src_char; |
581ade4d JL |
468 | __le16 dst_char; |
469 | wchar_t tmp; | |
b2910307 NA |
470 | wchar_t *wchar_to; /* UTF-16 */ |
471 | int ret; | |
472 | unicode_t u; | |
84cdf74e | 473 | |
a4153cb1 | 474 | if (map_chars == NO_MAP_UNI_RSVD) |
acbbb76a | 475 | return cifs_strtoUTF16(target, source, PATH_MAX, cp); |
84cdf74e | 476 | |
b2910307 NA |
477 | wchar_to = kzalloc(6, GFP_KERNEL); |
478 | ||
ce36d9ab | 479 | for (i = 0; i < srclen; j++) { |
84cdf74e | 480 | src_char = source[i]; |
11379b5e | 481 | charlen = 1; |
a4153cb1 SF |
482 | |
483 | /* check if end of string */ | |
484 | if (src_char == 0) | |
acbbb76a | 485 | goto ctoUTF16_out; |
a4153cb1 SF |
486 | |
487 | /* see if we must remap this char */ | |
488 | if (map_chars == SFU_MAP_UNI_RSVD) | |
489 | dst_char = convert_to_sfu_char(src_char); | |
45e8a258 SF |
490 | else if (map_chars == SFM_MAP_UNI_RSVD) { |
491 | bool end_of_string; | |
492 | ||
493 | if (i == srclen - 1) | |
494 | end_of_string = true; | |
495 | else | |
496 | end_of_string = false; | |
497 | ||
498 | dst_char = convert_to_sfm_char(src_char, end_of_string); | |
499 | } else | |
a4153cb1 | 500 | dst_char = 0; |
84cdf74e JL |
501 | /* |
502 | * FIXME: We can not handle remapping backslash (UNI_SLASH) | |
503 | * until all the calls to build_path_from_dentry are modified, | |
504 | * as they use backslash as separator. | |
505 | */ | |
a4153cb1 | 506 | if (dst_char == 0) { |
581ade4d JL |
507 | charlen = cp->char2uni(source + i, srclen - i, &tmp); |
508 | dst_char = cpu_to_le16(tmp); | |
509 | ||
84cdf74e JL |
510 | /* |
511 | * if no match, use question mark, which at least in | |
512 | * some cases serves as wild card | |
513 | */ | |
b2910307 NA |
514 | if (charlen > 0) |
515 | goto ctoUTF16; | |
516 | ||
517 | /* convert SURROGATE_PAIR */ | |
518 | if (strcmp(cp->charset, "utf8") || !wchar_to) | |
519 | goto unknown; | |
520 | if (*(source + i) & 0x80) { | |
521 | charlen = utf8_to_utf32(source + i, 6, &u); | |
522 | if (charlen < 0) | |
523 | goto unknown; | |
524 | } else | |
525 | goto unknown; | |
526 | ret = utf8s_to_utf16s(source + i, charlen, | |
527 | UTF16_LITTLE_ENDIAN, | |
528 | wchar_to, 6); | |
529 | if (ret < 0) | |
530 | goto unknown; | |
531 | ||
532 | i += charlen; | |
533 | dst_char = cpu_to_le16(*wchar_to); | |
534 | if (charlen <= 3) | |
535 | /* 1-3bytes UTF-8 to 2bytes UTF-16 */ | |
536 | put_unaligned(dst_char, &target[j]); | |
537 | else if (charlen == 4) { | |
538 | /* 4bytes UTF-8(surrogate pair) to 4bytes UTF-16 | |
539 | * 7-8bytes UTF-8(IVS) divided to 2 UTF-16 | |
540 | * (charlen=3+4 or 4+4) */ | |
541 | put_unaligned(dst_char, &target[j]); | |
542 | dst_char = cpu_to_le16(*(wchar_to + 1)); | |
543 | j++; | |
544 | put_unaligned(dst_char, &target[j]); | |
545 | } else if (charlen >= 5) { | |
546 | /* 5-6bytes UTF-8 to 6bytes UTF-16 */ | |
547 | put_unaligned(dst_char, &target[j]); | |
548 | dst_char = cpu_to_le16(*(wchar_to + 1)); | |
549 | j++; | |
550 | put_unaligned(dst_char, &target[j]); | |
551 | dst_char = cpu_to_le16(*(wchar_to + 2)); | |
552 | j++; | |
553 | put_unaligned(dst_char, &target[j]); | |
84cdf74e | 554 | } |
b2910307 NA |
555 | continue; |
556 | ||
557 | unknown: | |
558 | dst_char = cpu_to_le16(0x003f); | |
559 | charlen = 1; | |
84cdf74e | 560 | } |
b2910307 NA |
561 | |
562 | ctoUTF16: | |
11379b5e JL |
563 | /* |
564 | * character may take more than one byte in the source string, | |
565 | * but will take exactly two bytes in the target string | |
566 | */ | |
567 | i += charlen; | |
581ade4d | 568 | put_unaligned(dst_char, &target[j]); |
84cdf74e JL |
569 | } |
570 | ||
acbbb76a | 571 | ctoUTF16_out: |
ce36d9ab | 572 | put_unaligned(0, &target[j]); /* Null terminate target unicode string */ |
b2910307 | 573 | kfree(wchar_to); |
c73f6939 | 574 | return j; |
84cdf74e | 575 | } |
2503a0db PS |
576 | |
577 | #ifdef CONFIG_CIFS_SMB2 | |
578 | /* | |
579 | * cifs_local_to_utf16_bytes - how long will a string be after conversion? | |
580 | * @from - pointer to input string | |
581 | * @maxbytes - don't go past this many bytes of input string | |
582 | * @codepage - source codepage | |
583 | * | |
584 | * Walk a string and return the number of bytes that the string will | |
585 | * be after being converted to the given charset, not including any null | |
586 | * termination required. Don't walk past maxbytes in the source buffer. | |
587 | */ | |
588 | ||
589 | static int | |
590 | cifs_local_to_utf16_bytes(const char *from, int len, | |
591 | const struct nls_table *codepage) | |
592 | { | |
593 | int charlen; | |
594 | int i; | |
595 | wchar_t wchar_to; | |
596 | ||
597 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { | |
598 | charlen = codepage->char2uni(from, len, &wchar_to); | |
599 | /* Failed conversion defaults to a question mark */ | |
600 | if (charlen < 1) | |
601 | charlen = 1; | |
602 | } | |
603 | return 2 * i; /* UTF16 characters are two bytes */ | |
604 | } | |
605 | ||
606 | /* | |
607 | * cifs_strndup_to_utf16 - copy a string to wire format from the local codepage | |
608 | * @src - source string | |
609 | * @maxlen - don't walk past this many bytes in the source string | |
610 | * @utf16_len - the length of the allocated string in bytes (including null) | |
611 | * @cp - source codepage | |
612 | * @remap - map special chars | |
613 | * | |
614 | * Take a string convert it from the local codepage to UTF16 and | |
615 | * put it in a new buffer. Returns a pointer to the new string or NULL on | |
616 | * error. | |
617 | */ | |
618 | __le16 * | |
619 | cifs_strndup_to_utf16(const char *src, const int maxlen, int *utf16_len, | |
620 | const struct nls_table *cp, int remap) | |
621 | { | |
622 | int len; | |
623 | __le16 *dst; | |
624 | ||
625 | len = cifs_local_to_utf16_bytes(src, maxlen, cp); | |
626 | len += 2; /* NULL */ | |
627 | dst = kmalloc(len, GFP_KERNEL); | |
628 | if (!dst) { | |
629 | *utf16_len = 0; | |
630 | return NULL; | |
631 | } | |
632 | cifsConvertToUTF16(dst, src, strlen(src), cp, remap); | |
633 | *utf16_len = len; | |
634 | return dst; | |
635 | } | |
636 | #endif /* CONFIG_CIFS_SMB2 */ |