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1 | /* |
2 | * fs/cifs/cifs_unicode.c |
3 | * |
4 | * Copyright (c) International Business Machines Corp., 2000,2009 |
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 |
9 | * the Free Software Foundation; either version 2 of the License, or |
10 | * (at your option) any later version. |
11 | * |
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 |
18 | * along with this program; if not, write to the Free Software |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
20 | */ |
21 | #include <linux/fs.h> |
22 | #include <linux/slab.h> |
23 | #include "cifs_unicode.h" |
24 | #include "cifs_uniupr.h" |
25 | #include "cifspdu.h" |
26 | #include "cifsglob.h" |
27 | #include "cifs_debug.h" |
28 | |
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]; |
47 | __u16 ftmp; |
48 | |
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); |
55 | if (charlen > 0) |
56 | outlen += charlen; |
57 | else |
58 | outlen++; |
59 | } |
60 | |
61 | return outlen; |
62 | } |
63 | |
64 | /* |
65 | * cifs_mapchar - convert a host-endian char to proper char in codepage |
66 | * @target - where converted character should be copied |
67 | * @src_char - 2 byte host-endian source character |
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 |
76 | cifs_mapchar(char *target, const __u16 src_char, const struct nls_table *cp, |
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 | */ |
89 | switch (src_char) { |
90 | case UNI_COLON: |
91 | *target = ':'; |
92 | break; |
93 | case UNI_ASTERISK: |
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: |
116 | len = cp->uni2char(src_char, target, NLS_MAX_CHARSET_SIZE); |
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]; |
155 | __u16 ftmp; |
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 | |
165 | for (i = 0; i < fromwords; i++) { |
166 | ftmp = get_unaligned_le16(&from[i]); |
167 | if (ftmp == 0) |
168 | break; |
169 | |
170 | /* |
171 | * check to see if converting this character might make the |
172 | * conversion bleed into the null terminator |
173 | */ |
174 | if (outlen >= safelen) { |
175 | charlen = cifs_mapchar(tmp, ftmp, codepage, mapchar); |
176 | if ((outlen + charlen) > (tolen - nullsize)) |
177 | break; |
178 | } |
179 | |
180 | /* put converted char into 'to' buffer */ |
181 | charlen = cifs_mapchar(&to[outlen], ftmp, codepage, mapchar); |
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 | |
192 | /* |
193 | * NAME: cifs_strtoUCS() |
194 | * |
195 | * FUNCTION: Convert character string to unicode string |
196 | * |
197 | */ |
198 | int |
199 | cifs_strtoUCS(__le16 *to, const char *from, int len, |
200 | const struct nls_table *codepage) |
201 | { |
202 | int charlen; |
203 | int i; |
204 | wchar_t wchar_to; /* needed to quiet sparse */ |
205 | |
206 | for (i = 0; len && *from; i++, from += charlen, len -= charlen) { |
207 | charlen = codepage->char2uni(from, len, &wchar_to); |
208 | if (charlen < 1) { |
209 | cERROR(1, "strtoUCS: char2uni of 0x%x returned %d", |
210 | *from, charlen); |
211 | /* A question mark */ |
212 | wchar_to = 0x003f; |
213 | charlen = 1; |
214 | } |
215 | put_unaligned_le16(wchar_to, &to[i]); |
216 | } |
217 | |
218 | put_unaligned_le16(0, &to[i]); |
219 | return i; |
220 | } |
221 | |
222 | /* |
223 | * cifs_strndup_from_ucs - copy a string from wire format to the local codepage |
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 * |
234 | cifs_strndup_from_ucs(const char *src, const int maxlen, const bool is_unicode, |
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 | |
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 |
267 | cifsConvertToUCS(__le16 *target, const char *source, int srclen, |
268 | const struct nls_table *cp, int mapChars) |
269 | { |
270 | int i, j, charlen; |
271 | char src_char; |
272 | __le16 dst_char; |
273 | wchar_t tmp; |
274 | |
275 | if (!mapChars) |
276 | return cifs_strtoUCS(target, source, PATH_MAX, cp); |
277 | |
278 | for (i = 0, j = 0; i < srclen; j++) { |
279 | src_char = source[i]; |
280 | charlen = 1; |
281 | switch (src_char) { |
282 | case 0: |
283 | put_unaligned(0, &target[j]); |
284 | goto ctoUCS_out; |
285 | case ':': |
286 | dst_char = cpu_to_le16(UNI_COLON); |
287 | break; |
288 | case '*': |
289 | dst_char = cpu_to_le16(UNI_ASTERISK); |
290 | break; |
291 | case '?': |
292 | dst_char = cpu_to_le16(UNI_QUESTION); |
293 | break; |
294 | case '<': |
295 | dst_char = cpu_to_le16(UNI_LESSTHAN); |
296 | break; |
297 | case '>': |
298 | dst_char = cpu_to_le16(UNI_GRTRTHAN); |
299 | break; |
300 | case '|': |
301 | dst_char = cpu_to_le16(UNI_PIPE); |
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: |
309 | charlen = cp->char2uni(source + i, srclen - i, &tmp); |
310 | dst_char = cpu_to_le16(tmp); |
311 | |
312 | /* |
313 | * if no match, use question mark, which at least in |
314 | * some cases serves as wild card |
315 | */ |
316 | if (charlen < 1) { |
317 | dst_char = cpu_to_le16(0x003f); |
318 | charlen = 1; |
319 | } |
320 | } |
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; |
326 | put_unaligned(dst_char, &target[j]); |
327 | } |
328 | |
329 | ctoUCS_out: |
330 | return i; |
331 | } |
332 | |
333 |
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