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