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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * fs/cifs/cifs_unicode.c | |
4 | * | |
d185cda7 | 5 | * Copyright (c) International Business Machines Corp., 2000,2009 |
1da177e4 | 6 | * Modified by Steve French (sfrench@us.ibm.com) |
1da177e4 LT |
7 | */ |
8 | #include <linux/fs.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
2baa2682 | 10 | #include "cifs_fs_sb.h" |
1da177e4 LT |
11 | #include "cifs_unicode.h" |
12 | #include "cifs_uniupr.h" | |
13 | #include "cifspdu.h" | |
3979877e | 14 | #include "cifsglob.h" |
1da177e4 LT |
15 | #include "cifs_debug.h" |
16 | ||
2baa2682 SF |
17 | int cifs_remap(struct cifs_sb_info *cifs_sb) |
18 | { | |
19 | int map_type; | |
20 | ||
21 | if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SFM_CHR) | |
22 | map_type = SFM_MAP_UNI_RSVD; | |
23 | else if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR) | |
24 | map_type = SFU_MAP_UNI_RSVD; | |
25 | else | |
26 | map_type = NO_MAP_UNI_RSVD; | |
27 | ||
28 | return map_type; | |
29 | } | |
30 | ||
b693855f SF |
31 | /* Convert character using the SFU - "Services for Unix" remapping range */ |
32 | static bool | |
33 | convert_sfu_char(const __u16 src_char, char *target) | |
7fabf0c9 | 34 | { |
7fabf0c9 JL |
35 | /* |
36 | * BB: Cannot handle remapping UNI_SLASH until all the calls to | |
37 | * build_path_from_dentry are modified, as they use slash as | |
38 | * separator. | |
39 | */ | |
ba2dbf30 | 40 | switch (src_char) { |
7fabf0c9 JL |
41 | case UNI_COLON: |
42 | *target = ':'; | |
43 | break; | |
581ade4d | 44 | case UNI_ASTERISK: |
7fabf0c9 JL |
45 | *target = '*'; |
46 | break; | |
47 | case UNI_QUESTION: | |
48 | *target = '?'; | |
49 | break; | |
50 | case UNI_PIPE: | |
51 | *target = '|'; | |
52 | break; | |
53 | case UNI_GRTRTHAN: | |
54 | *target = '>'; | |
55 | break; | |
56 | case UNI_LESSTHAN: | |
57 | *target = '<'; | |
58 | break; | |
59 | default: | |
b693855f | 60 | return false; |
7fabf0c9 | 61 | } |
b693855f SF |
62 | return true; |
63 | } | |
7fabf0c9 | 64 | |
b693855f SF |
65 | /* Convert character using the SFM - "Services for Mac" remapping range */ |
66 | static bool | |
67 | convert_sfm_char(const __u16 src_char, char *target) | |
68 | { | |
7e46f090 BJ |
69 | if (src_char >= 0xF001 && src_char <= 0xF01F) { |
70 | *target = src_char - 0xF000; | |
71 | return true; | |
72 | } | |
b693855f SF |
73 | switch (src_char) { |
74 | case SFM_COLON: | |
75 | *target = ':'; | |
76 | break; | |
85435d7a BJ |
77 | case SFM_DOUBLEQUOTE: |
78 | *target = '"'; | |
79 | break; | |
b693855f SF |
80 | case SFM_ASTERISK: |
81 | *target = '*'; | |
82 | break; | |
83 | case SFM_QUESTION: | |
84 | *target = '?'; | |
85 | break; | |
86 | case SFM_PIPE: | |
87 | *target = '|'; | |
88 | break; | |
89 | case SFM_GRTRTHAN: | |
90 | *target = '>'; | |
91 | break; | |
92 | case SFM_LESSTHAN: | |
93 | *target = '<'; | |
94 | break; | |
45e8a258 SF |
95 | case SFM_SPACE: |
96 | *target = ' '; | |
97 | break; | |
98 | case SFM_PERIOD: | |
99 | *target = '.'; | |
100 | break; | |
b693855f SF |
101 | default: |
102 | return false; | |
103 | } | |
104 | return true; | |
105 | } | |
106 | ||
107 | ||
108 | /* | |
109 | * cifs_mapchar - convert a host-endian char to proper char in codepage | |
110 | * @target - where converted character should be copied | |
111 | * @src_char - 2 byte host-endian source character | |
112 | * @cp - codepage to which character should be converted | |
113 | * @map_type - How should the 7 NTFS/SMB reserved characters be mapped to UCS2? | |
114 | * | |
115 | * This function handles the conversion of a single character. It is the | |
116 | * responsibility of the caller to ensure that the target buffer is large | |
117 | * enough to hold the result of the conversion (at least NLS_MAX_CHARSET_SIZE). | |
118 | */ | |
119 | static int | |
b2910307 | 120 | cifs_mapchar(char *target, const __u16 *from, const struct nls_table *cp, |
b693855f SF |
121 | int maptype) |
122 | { | |
123 | int len = 1; | |
b2910307 NA |
124 | __u16 src_char; |
125 | ||
126 | src_char = *from; | |
b693855f SF |
127 | |
128 | if ((maptype == SFM_MAP_UNI_RSVD) && convert_sfm_char(src_char, target)) | |
129 | return len; | |
130 | else if ((maptype == SFU_MAP_UNI_RSVD) && | |
131 | convert_sfu_char(src_char, target)) | |
132 | return len; | |
7fabf0c9 | 133 | |
b693855f | 134 | /* if character not one of seven in special remap set */ |
ba2dbf30 | 135 | len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE); |
b2910307 NA |
136 | if (len <= 0) |
137 | goto surrogate_pair; | |
138 | ||
139 | return len; | |
140 | ||
141 | surrogate_pair: | |
142 | /* convert SURROGATE_PAIR and IVS */ | |
143 | if (strcmp(cp->charset, "utf8")) | |
144 | goto unknown; | |
145 | len = utf16s_to_utf8s(from, 3, UTF16_LITTLE_ENDIAN, target, 6); | |
146 | if (len <= 0) | |
147 | goto unknown; | |
148 | return len; | |
149 | ||
150 | unknown: | |
151 | *target = '?'; | |
152 | len = 1; | |
b693855f | 153 | return len; |
7fabf0c9 JL |
154 | } |
155 | ||
156 | /* | |
acbbb76a | 157 | * cifs_from_utf16 - convert utf16le string to local charset |
7fabf0c9 JL |
158 | * @to - destination buffer |
159 | * @from - source buffer | |
160 | * @tolen - destination buffer size (in bytes) | |
161 | * @fromlen - source buffer size (in bytes) | |
162 | * @codepage - codepage to which characters should be converted | |
163 | * @mapchar - should characters be remapped according to the mapchars option? | |
164 | * | |
acbbb76a | 165 | * Convert a little-endian utf16le string (as sent by the server) to a string |
7fabf0c9 JL |
166 | * in the provided codepage. The tolen and fromlen parameters are to ensure |
167 | * that the code doesn't walk off of the end of the buffer (which is always | |
168 | * a danger if the alignment of the source buffer is off). The destination | |
169 | * string is always properly null terminated and fits in the destination | |
170 | * buffer. Returns the length of the destination string in bytes (including | |
171 | * null terminator). | |
172 | * | |
173 | * Note that some windows versions actually send multiword UTF-16 characters | |
acbbb76a | 174 | * instead of straight UTF16-2. The linux nls routines however aren't able to |
7fabf0c9 JL |
175 | * deal with those characters properly. In the event that we get some of |
176 | * those characters, they won't be translated properly. | |
177 | */ | |
178 | int | |
acbbb76a | 179 | cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen, |
b693855f | 180 | const struct nls_table *codepage, int map_type) |
7fabf0c9 JL |
181 | { |
182 | int i, charlen, safelen; | |
183 | int outlen = 0; | |
184 | int nullsize = nls_nullsize(codepage); | |
185 | int fromwords = fromlen / 2; | |
186 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
b2910307 | 187 | __u16 ftmp[3]; /* ftmp[3] = 3array x 2bytes = 6bytes UTF-16 */ |
7fabf0c9 JL |
188 | |
189 | /* | |
190 | * because the chars can be of varying widths, we need to take care | |
191 | * not to overflow the destination buffer when we get close to the | |
192 | * end of it. Until we get to this offset, we don't need to check | |
193 | * for overflow however. | |
194 | */ | |
195 | safelen = tolen - (NLS_MAX_CHARSET_SIZE + nullsize); | |
196 | ||
ba2dbf30 | 197 | for (i = 0; i < fromwords; i++) { |
b2910307 NA |
198 | ftmp[0] = get_unaligned_le16(&from[i]); |
199 | if (ftmp[0] == 0) | |
ba2dbf30 | 200 | break; |
b2910307 NA |
201 | if (i + 1 < fromwords) |
202 | ftmp[1] = get_unaligned_le16(&from[i + 1]); | |
203 | else | |
204 | ftmp[1] = 0; | |
205 | if (i + 2 < fromwords) | |
206 | ftmp[2] = get_unaligned_le16(&from[i + 2]); | |
207 | else | |
208 | ftmp[2] = 0; | |
ba2dbf30 | 209 | |
7fabf0c9 JL |
210 | /* |
211 | * check to see if converting this character might make the | |
212 | * conversion bleed into the null terminator | |
213 | */ | |
214 | if (outlen >= safelen) { | |
b693855f | 215 | charlen = cifs_mapchar(tmp, ftmp, codepage, map_type); |
7fabf0c9 JL |
216 | if ((outlen + charlen) > (tolen - nullsize)) |
217 | break; | |
218 | } | |
219 | ||
220 | /* put converted char into 'to' buffer */ | |
b693855f | 221 | charlen = cifs_mapchar(&to[outlen], ftmp, codepage, map_type); |
7fabf0c9 | 222 | outlen += charlen; |
b2910307 NA |
223 | |
224 | /* charlen (=bytes of UTF-8 for 1 character) | |
225 | * 4bytes UTF-8(surrogate pair) is charlen=4 | |
226 | * (4bytes UTF-16 code) | |
227 | * 7-8bytes UTF-8(IVS) is charlen=3+4 or 4+4 | |
228 | * (2 UTF-8 pairs divided to 2 UTF-16 pairs) */ | |
229 | if (charlen == 4) | |
230 | i++; | |
231 | else if (charlen >= 5) | |
232 | /* 5-6bytes UTF-8 */ | |
233 | i += 2; | |
7fabf0c9 JL |
234 | } |
235 | ||
236 | /* properly null-terminate string */ | |
237 | for (i = 0; i < nullsize; i++) | |
238 | to[outlen++] = 0; | |
239 | ||
240 | return outlen; | |
241 | } | |
242 | ||
1da177e4 | 243 | /* |
acbbb76a | 244 | * NAME: cifs_strtoUTF16() |
1da177e4 LT |
245 | * |
246 | * FUNCTION: Convert character string to unicode string | |
247 | * | |
248 | */ | |
249 | int | |
acbbb76a | 250 | cifs_strtoUTF16(__le16 *to, const char *from, int len, |
1da177e4 LT |
251 | const struct nls_table *codepage) |
252 | { | |
253 | int charlen; | |
254 | int i; | |
ba2dbf30 | 255 | wchar_t wchar_to; /* needed to quiet sparse */ |
1da177e4 | 256 | |
fd3ba42c FZ |
257 | /* special case for utf8 to handle no plane0 chars */ |
258 | if (!strcmp(codepage->charset, "utf8")) { | |
259 | /* | |
260 | * convert utf8 -> utf16, we assume we have enough space | |
261 | * as caller should have assumed conversion does not overflow | |
262 | * in destination len is length in wchar_t units (16bits) | |
263 | */ | |
264 | i = utf8s_to_utf16s(from, len, UTF16_LITTLE_ENDIAN, | |
265 | (wchar_t *) to, len); | |
266 | ||
267 | /* if success terminate and exit */ | |
268 | if (i >= 0) | |
269 | goto success; | |
270 | /* | |
271 | * if fails fall back to UCS encoding as this | |
272 | * function should not return negative values | |
273 | * currently can fail only if source contains | |
274 | * invalid encoded characters | |
275 | */ | |
276 | } | |
277 | ||
1da177e4 | 278 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { |
ba2dbf30 | 279 | charlen = codepage->char2uni(from, len, &wchar_to); |
1da177e4 | 280 | if (charlen < 1) { |
f96637be JP |
281 | cifs_dbg(VFS, "strtoUTF16: char2uni of 0x%x returned %d\n", |
282 | *from, charlen); | |
69114089 | 283 | /* A question mark */ |
ba2dbf30 | 284 | wchar_to = 0x003f; |
1da177e4 | 285 | charlen = 1; |
ba2dbf30 JL |
286 | } |
287 | put_unaligned_le16(wchar_to, &to[i]); | |
1da177e4 LT |
288 | } |
289 | ||
fd3ba42c | 290 | success: |
ba2dbf30 | 291 | put_unaligned_le16(0, &to[i]); |
1da177e4 LT |
292 | return i; |
293 | } | |
294 | ||
b2910307 NA |
295 | /* |
296 | * cifs_utf16_bytes - how long will a string be after conversion? | |
297 | * @utf16 - pointer to input string | |
298 | * @maxbytes - don't go past this many bytes of input string | |
299 | * @codepage - destination codepage | |
300 | * | |
301 | * Walk a utf16le string and return the number of bytes that the string will | |
302 | * be after being converted to the given charset, not including any null | |
303 | * termination required. Don't walk past maxbytes in the source buffer. | |
304 | */ | |
305 | int | |
306 | cifs_utf16_bytes(const __le16 *from, int maxbytes, | |
307 | const struct nls_table *codepage) | |
308 | { | |
309 | int i; | |
310 | int charlen, outlen = 0; | |
311 | int maxwords = maxbytes / 2; | |
312 | char tmp[NLS_MAX_CHARSET_SIZE]; | |
313 | __u16 ftmp[3]; | |
314 | ||
315 | for (i = 0; i < maxwords; i++) { | |
316 | ftmp[0] = get_unaligned_le16(&from[i]); | |
317 | if (ftmp[0] == 0) | |
318 | break; | |
319 | if (i + 1 < maxwords) | |
320 | ftmp[1] = get_unaligned_le16(&from[i + 1]); | |
321 | else | |
322 | ftmp[1] = 0; | |
323 | if (i + 2 < maxwords) | |
324 | ftmp[2] = get_unaligned_le16(&from[i + 2]); | |
325 | else | |
326 | ftmp[2] = 0; | |
327 | ||
328 | charlen = cifs_mapchar(tmp, ftmp, codepage, NO_MAP_UNI_RSVD); | |
329 | outlen += charlen; | |
330 | } | |
331 | ||
332 | return outlen; | |
333 | } | |
334 | ||
066ce689 | 335 | /* |
acbbb76a SF |
336 | * cifs_strndup_from_utf16 - copy a string from wire format to the local |
337 | * codepage | |
066ce689 JL |
338 | * @src - source string |
339 | * @maxlen - don't walk past this many bytes in the source string | |
340 | * @is_unicode - is this a unicode string? | |
341 | * @codepage - destination codepage | |
342 | * | |
343 | * Take a string given by the server, convert it to the local codepage and | |
344 | * put it in a new buffer. Returns a pointer to the new string or NULL on | |
345 | * error. | |
346 | */ | |
347 | char * | |
acbbb76a SF |
348 | cifs_strndup_from_utf16(const char *src, const int maxlen, |
349 | const bool is_unicode, const struct nls_table *codepage) | |
066ce689 JL |
350 | { |
351 | int len; | |
352 | char *dst; | |
353 | ||
354 | if (is_unicode) { | |
acbbb76a | 355 | len = cifs_utf16_bytes((__le16 *) src, maxlen, codepage); |
066ce689 JL |
356 | len += nls_nullsize(codepage); |
357 | dst = kmalloc(len, GFP_KERNEL); | |
358 | if (!dst) | |
359 | return NULL; | |
acbbb76a | 360 | cifs_from_utf16(dst, (__le16 *) src, len, maxlen, codepage, |
b693855f | 361 | NO_MAP_UNI_RSVD); |
066ce689 JL |
362 | } else { |
363 | len = strnlen(src, maxlen); | |
364 | len++; | |
365 | dst = kmalloc(len, GFP_KERNEL); | |
366 | if (!dst) | |
367 | return NULL; | |
368 | strlcpy(dst, src, len); | |
369 | } | |
370 | ||
371 | return dst; | |
372 | } | |
373 | ||
a4153cb1 SF |
374 | static __le16 convert_to_sfu_char(char src_char) |
375 | { | |
376 | __le16 dest_char; | |
377 | ||
378 | switch (src_char) { | |
379 | case ':': | |
380 | dest_char = cpu_to_le16(UNI_COLON); | |
381 | break; | |
382 | case '*': | |
383 | dest_char = cpu_to_le16(UNI_ASTERISK); | |
384 | break; | |
385 | case '?': | |
386 | dest_char = cpu_to_le16(UNI_QUESTION); | |
387 | break; | |
388 | case '<': | |
389 | dest_char = cpu_to_le16(UNI_LESSTHAN); | |
390 | break; | |
391 | case '>': | |
392 | dest_char = cpu_to_le16(UNI_GRTRTHAN); | |
393 | break; | |
394 | case '|': | |
395 | dest_char = cpu_to_le16(UNI_PIPE); | |
396 | break; | |
397 | default: | |
398 | dest_char = 0; | |
399 | } | |
400 | ||
401 | return dest_char; | |
402 | } | |
403 | ||
45e8a258 | 404 | static __le16 convert_to_sfm_char(char src_char, bool end_of_string) |
a4153cb1 SF |
405 | { |
406 | __le16 dest_char; | |
407 | ||
7e46f090 BJ |
408 | if (src_char >= 0x01 && src_char <= 0x1F) { |
409 | dest_char = cpu_to_le16(src_char + 0xF000); | |
410 | return dest_char; | |
411 | } | |
a4153cb1 SF |
412 | switch (src_char) { |
413 | case ':': | |
414 | dest_char = cpu_to_le16(SFM_COLON); | |
415 | break; | |
85435d7a BJ |
416 | case '"': |
417 | dest_char = cpu_to_le16(SFM_DOUBLEQUOTE); | |
418 | break; | |
a4153cb1 SF |
419 | case '*': |
420 | dest_char = cpu_to_le16(SFM_ASTERISK); | |
421 | break; | |
422 | case '?': | |
423 | dest_char = cpu_to_le16(SFM_QUESTION); | |
424 | break; | |
425 | case '<': | |
426 | dest_char = cpu_to_le16(SFM_LESSTHAN); | |
427 | break; | |
428 | case '>': | |
429 | dest_char = cpu_to_le16(SFM_GRTRTHAN); | |
430 | break; | |
431 | case '|': | |
432 | dest_char = cpu_to_le16(SFM_PIPE); | |
433 | break; | |
45e8a258 SF |
434 | case '.': |
435 | if (end_of_string) | |
436 | dest_char = cpu_to_le16(SFM_PERIOD); | |
437 | else | |
438 | dest_char = 0; | |
439 | break; | |
440 | case ' ': | |
441 | if (end_of_string) | |
442 | dest_char = cpu_to_le16(SFM_SPACE); | |
443 | else | |
444 | dest_char = 0; | |
445 | break; | |
a4153cb1 SF |
446 | default: |
447 | dest_char = 0; | |
448 | } | |
449 | ||
450 | return dest_char; | |
451 | } | |
452 | ||
84cdf74e JL |
453 | /* |
454 | * Convert 16 bit Unicode pathname to wire format from string in current code | |
455 | * page. Conversion may involve remapping up the six characters that are | |
456 | * only legal in POSIX-like OS (if they are present in the string). Path | |
457 | * names are little endian 16 bit Unicode on the wire | |
458 | */ | |
459 | int | |
acbbb76a | 460 | cifsConvertToUTF16(__le16 *target, const char *source, int srclen, |
a4153cb1 | 461 | const struct nls_table *cp, int map_chars) |
84cdf74e | 462 | { |
ce36d9ab SF |
463 | int i, charlen; |
464 | int j = 0; | |
84cdf74e | 465 | char src_char; |
581ade4d JL |
466 | __le16 dst_char; |
467 | wchar_t tmp; | |
b2910307 NA |
468 | wchar_t *wchar_to; /* UTF-16 */ |
469 | int ret; | |
470 | unicode_t u; | |
84cdf74e | 471 | |
a4153cb1 | 472 | if (map_chars == NO_MAP_UNI_RSVD) |
acbbb76a | 473 | return cifs_strtoUTF16(target, source, PATH_MAX, cp); |
84cdf74e | 474 | |
b2910307 NA |
475 | wchar_to = kzalloc(6, GFP_KERNEL); |
476 | ||
ce36d9ab | 477 | for (i = 0; i < srclen; j++) { |
84cdf74e | 478 | src_char = source[i]; |
11379b5e | 479 | charlen = 1; |
a4153cb1 SF |
480 | |
481 | /* check if end of string */ | |
482 | if (src_char == 0) | |
acbbb76a | 483 | goto ctoUTF16_out; |
a4153cb1 SF |
484 | |
485 | /* see if we must remap this char */ | |
486 | if (map_chars == SFU_MAP_UNI_RSVD) | |
487 | dst_char = convert_to_sfu_char(src_char); | |
45e8a258 SF |
488 | else if (map_chars == SFM_MAP_UNI_RSVD) { |
489 | bool end_of_string; | |
490 | ||
491 | if (i == srclen - 1) | |
492 | end_of_string = true; | |
493 | else | |
494 | end_of_string = false; | |
495 | ||
496 | dst_char = convert_to_sfm_char(src_char, end_of_string); | |
497 | } else | |
a4153cb1 | 498 | dst_char = 0; |
84cdf74e JL |
499 | /* |
500 | * FIXME: We can not handle remapping backslash (UNI_SLASH) | |
501 | * until all the calls to build_path_from_dentry are modified, | |
502 | * as they use backslash as separator. | |
503 | */ | |
a4153cb1 | 504 | if (dst_char == 0) { |
581ade4d JL |
505 | charlen = cp->char2uni(source + i, srclen - i, &tmp); |
506 | dst_char = cpu_to_le16(tmp); | |
507 | ||
84cdf74e JL |
508 | /* |
509 | * if no match, use question mark, which at least in | |
510 | * some cases serves as wild card | |
511 | */ | |
b2910307 NA |
512 | if (charlen > 0) |
513 | goto ctoUTF16; | |
514 | ||
515 | /* convert SURROGATE_PAIR */ | |
516 | if (strcmp(cp->charset, "utf8") || !wchar_to) | |
517 | goto unknown; | |
518 | if (*(source + i) & 0x80) { | |
519 | charlen = utf8_to_utf32(source + i, 6, &u); | |
520 | if (charlen < 0) | |
521 | goto unknown; | |
522 | } else | |
523 | goto unknown; | |
524 | ret = utf8s_to_utf16s(source + i, charlen, | |
525 | UTF16_LITTLE_ENDIAN, | |
526 | wchar_to, 6); | |
527 | if (ret < 0) | |
528 | goto unknown; | |
529 | ||
530 | i += charlen; | |
531 | dst_char = cpu_to_le16(*wchar_to); | |
532 | if (charlen <= 3) | |
533 | /* 1-3bytes UTF-8 to 2bytes UTF-16 */ | |
534 | put_unaligned(dst_char, &target[j]); | |
535 | else if (charlen == 4) { | |
536 | /* 4bytes UTF-8(surrogate pair) to 4bytes UTF-16 | |
537 | * 7-8bytes UTF-8(IVS) divided to 2 UTF-16 | |
538 | * (charlen=3+4 or 4+4) */ | |
539 | put_unaligned(dst_char, &target[j]); | |
540 | dst_char = cpu_to_le16(*(wchar_to + 1)); | |
541 | j++; | |
542 | put_unaligned(dst_char, &target[j]); | |
543 | } else if (charlen >= 5) { | |
544 | /* 5-6bytes UTF-8 to 6bytes UTF-16 */ | |
545 | put_unaligned(dst_char, &target[j]); | |
546 | dst_char = cpu_to_le16(*(wchar_to + 1)); | |
547 | j++; | |
548 | put_unaligned(dst_char, &target[j]); | |
549 | dst_char = cpu_to_le16(*(wchar_to + 2)); | |
550 | j++; | |
551 | put_unaligned(dst_char, &target[j]); | |
84cdf74e | 552 | } |
b2910307 NA |
553 | continue; |
554 | ||
555 | unknown: | |
556 | dst_char = cpu_to_le16(0x003f); | |
557 | charlen = 1; | |
84cdf74e | 558 | } |
b2910307 NA |
559 | |
560 | ctoUTF16: | |
11379b5e JL |
561 | /* |
562 | * character may take more than one byte in the source string, | |
563 | * but will take exactly two bytes in the target string | |
564 | */ | |
565 | i += charlen; | |
581ade4d | 566 | put_unaligned(dst_char, &target[j]); |
84cdf74e JL |
567 | } |
568 | ||
acbbb76a | 569 | ctoUTF16_out: |
ce36d9ab | 570 | put_unaligned(0, &target[j]); /* Null terminate target unicode string */ |
b2910307 | 571 | kfree(wchar_to); |
c73f6939 | 572 | return j; |
84cdf74e | 573 | } |
2503a0db | 574 | |
2503a0db PS |
575 | /* |
576 | * cifs_local_to_utf16_bytes - how long will a string be after conversion? | |
577 | * @from - pointer to input string | |
578 | * @maxbytes - don't go past this many bytes of input string | |
579 | * @codepage - source codepage | |
580 | * | |
581 | * Walk a string and return the number of bytes that the string will | |
582 | * be after being converted to the given charset, not including any null | |
583 | * termination required. Don't walk past maxbytes in the source buffer. | |
584 | */ | |
585 | ||
586 | static int | |
587 | cifs_local_to_utf16_bytes(const char *from, int len, | |
588 | const struct nls_table *codepage) | |
589 | { | |
590 | int charlen; | |
591 | int i; | |
592 | wchar_t wchar_to; | |
593 | ||
594 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { | |
595 | charlen = codepage->char2uni(from, len, &wchar_to); | |
596 | /* Failed conversion defaults to a question mark */ | |
597 | if (charlen < 1) | |
598 | charlen = 1; | |
599 | } | |
600 | return 2 * i; /* UTF16 characters are two bytes */ | |
601 | } | |
602 | ||
603 | /* | |
604 | * cifs_strndup_to_utf16 - copy a string to wire format from the local codepage | |
605 | * @src - source string | |
606 | * @maxlen - don't walk past this many bytes in the source string | |
607 | * @utf16_len - the length of the allocated string in bytes (including null) | |
608 | * @cp - source codepage | |
609 | * @remap - map special chars | |
610 | * | |
611 | * Take a string convert it from the local codepage to UTF16 and | |
612 | * put it in a new buffer. Returns a pointer to the new string or NULL on | |
613 | * error. | |
614 | */ | |
615 | __le16 * | |
616 | cifs_strndup_to_utf16(const char *src, const int maxlen, int *utf16_len, | |
617 | const struct nls_table *cp, int remap) | |
618 | { | |
619 | int len; | |
620 | __le16 *dst; | |
621 | ||
622 | len = cifs_local_to_utf16_bytes(src, maxlen, cp); | |
623 | len += 2; /* NULL */ | |
624 | dst = kmalloc(len, GFP_KERNEL); | |
625 | if (!dst) { | |
626 | *utf16_len = 0; | |
627 | return NULL; | |
628 | } | |
629 | cifsConvertToUTF16(dst, src, strlen(src), cp, remap); | |
630 | *utf16_len = len; | |
631 | return dst; | |
632 | } |