2 * cifs_unicode: Unicode kernel case support
5 * Convert a unicode character to upper or lower case using
8 * Copyright (c) International Business Machines Corp., 2000,2009
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
18 * the GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
26 * These APIs are based on the C library functions. The semantics
27 * should match the C functions but with expanded size operands.
29 * The upper/lower functions are based on a table created by mkupr.
30 * This is a compressed table of upper and lower case conversion.
33 #ifndef _CIFS_UNICODE_H
34 #define _CIFS_UNICODE_H
36 #include <asm/byteorder.h>
37 #include <linux/types.h>
38 #include <linux/nls.h>
40 #define UNIUPR_NOLOWER /* Example to not expand lower case tables */
43 * Windows maps these to the user defined 16 bit Unicode range since they are
44 * reserved symbols (along with \ and /), otherwise illegal to store
45 * in filenames in NTFS
47 #define UNI_ASTERISK (__u16) ('*' + 0xF000)
48 #define UNI_QUESTION (__u16) ('?' + 0xF000)
49 #define UNI_COLON (__u16) (':' + 0xF000)
50 #define UNI_GRTRTHAN (__u16) ('>' + 0xF000)
51 #define UNI_LESSTHAN (__u16) ('<' + 0xF000)
52 #define UNI_PIPE (__u16) ('|' + 0xF000)
53 #define UNI_SLASH (__u16) ('\\' + 0xF000)
55 /* Just define what we want from uniupr.h. We don't want to define the tables
56 * in each source file.
58 #ifndef UNICASERANGE_DEFINED
64 #endif /* UNICASERANGE_DEFINED */
66 #ifndef UNIUPR_NOUPPER
67 extern signed char CifsUniUpperTable[512];
68 extern const struct UniCaseRange CifsUniUpperRange[];
69 #endif /* UNIUPR_NOUPPER */
71 #ifndef UNIUPR_NOLOWER
72 extern signed char CifsUniLowerTable[512];
73 extern const struct UniCaseRange CifsUniLowerRange[];
74 #endif /* UNIUPR_NOLOWER */
77 int cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
78 const struct nls_table *codepage, bool mapchar);
79 int cifs_utf16_bytes(const __le16 *from, int maxbytes,
80 const struct nls_table *codepage);
81 int cifs_strtoUTF16(__le16 *, const char *, int, const struct nls_table *);
82 char *cifs_strndup_from_utf16(const char *src, const int maxlen,
83 const bool is_unicode,
84 const struct nls_table *codepage);
85 extern int cifsConvertToUTF16(__le16 *target, const char *source, int maxlen,
86 const struct nls_table *cp, int mapChars);
87 #ifdef CONFIG_CIFS_SMB2
88 extern __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
89 int *utf16_len, const struct nls_table *cp,
91 #endif /* CONFIG_CIFS_SMB2 */
95 * UniStrcat: Concatenate the second string to the first
98 * Address of the first string
100 static inline wchar_t *
101 UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
103 wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
105 while (*ucs1++) ; /* To end of first string */
106 ucs1--; /* Return to the null */
107 while ((*ucs1++ = *ucs2++)) ; /* copy string 2 over */
112 * UniStrchr: Find a character in a string
115 * Address of first occurrence of character in string
116 * or NULL if the character is not in the string
118 static inline wchar_t *
119 UniStrchr(const wchar_t *ucs, wchar_t uc)
121 while ((*ucs != uc) && *ucs)
125 return (wchar_t *) ucs;
130 * UniStrcmp: Compare two strings
133 * < 0: First string is less than second
134 * = 0: Strings are equal
135 * > 0: First string is greater than second
138 UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
140 while ((*ucs1 == *ucs2) && *ucs1) {
144 return (int) *ucs1 - (int) *ucs2;
148 * UniStrcpy: Copy a string
150 static inline wchar_t *
151 UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
153 wchar_t *anchor = ucs1; /* save the start of result string */
155 while ((*ucs1++ = *ucs2++)) ;
160 * UniStrlen: Return the length of a string (in 16 bit Unicode chars not bytes)
163 UniStrlen(const wchar_t *ucs1)
173 * UniStrnlen: Return the length (in 16 bit Unicode chars not bytes) of a
174 * string (length limited)
177 UniStrnlen(const wchar_t *ucs1, int maxlen)
190 * UniStrncat: Concatenate length limited string
192 static inline wchar_t *
193 UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
195 wchar_t *anchor = ucs1; /* save pointer to string 1 */
198 ucs1--; /* point to null terminator of s1 */
199 while (n-- && (*ucs1 = *ucs2)) { /* copy s2 after s1 */
203 *ucs1 = 0; /* Null terminate the result */
208 * UniStrncmp: Compare length limited string
211 UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
214 return 0; /* Null strings are equal */
215 while ((*ucs1 == *ucs2) && *ucs1 && --n) {
219 return (int) *ucs1 - (int) *ucs2;
223 * UniStrncmp_le: Compare length limited string - native to little-endian
226 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
229 return 0; /* Null strings are equal */
230 while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
234 return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
238 * UniStrncpy: Copy length limited string with pad
240 static inline wchar_t *
241 UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
243 wchar_t *anchor = ucs1;
245 while (n-- && *ucs2) /* Copy the strings */
249 while (n--) /* Pad with nulls */
255 * UniStrncpy_le: Copy length limited string with pad to little-endian
257 static inline wchar_t *
258 UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
260 wchar_t *anchor = ucs1;
262 while (n-- && *ucs2) /* Copy the strings */
263 *ucs1++ = __le16_to_cpu(*ucs2++);
266 while (n--) /* Pad with nulls */
272 * UniStrstr: Find a string in a string
275 * Address of first match found
276 * NULL if no matching string is found
278 static inline wchar_t *
279 UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
281 const wchar_t *anchor1 = ucs1;
282 const wchar_t *anchor2 = ucs2;
285 if (*ucs1 == *ucs2) {
286 /* Partial match found */
290 if (!*ucs2) /* Match found */
291 return (wchar_t *) anchor1;
292 ucs1 = ++anchor1; /* No match */
297 if (!*ucs2) /* Both end together */
298 return (wchar_t *) anchor1; /* Match found */
299 return NULL; /* No match */
302 #ifndef UNIUPR_NOUPPER
304 * UniToupper: Convert a unicode character to upper case
306 static inline wchar_t
307 UniToupper(register wchar_t uc)
309 register const struct UniCaseRange *rp;
311 if (uc < sizeof(CifsUniUpperTable)) {
312 /* Latin characters */
313 return uc + CifsUniUpperTable[uc]; /* Use base tables */
315 rp = CifsUniUpperRange; /* Use range tables */
317 if (uc < rp->start) /* Before start of range */
318 return uc; /* Uppercase = input */
319 if (uc <= rp->end) /* In range */
320 return uc + rp->table[uc - rp->start];
321 rp++; /* Try next range */
324 return uc; /* Past last range */
328 * UniStrupr: Upper case a unicode string
330 static inline __le16 *
331 UniStrupr(register __le16 *upin)
336 while (*up) { /* For all characters */
337 *up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
340 return upin; /* Return input pointer */
342 #endif /* UNIUPR_NOUPPER */
344 #ifndef UNIUPR_NOLOWER
346 * UniTolower: Convert a unicode character to lower case
348 static inline wchar_t
349 UniTolower(register wchar_t uc)
351 register const struct UniCaseRange *rp;
353 if (uc < sizeof(CifsUniLowerTable)) {
354 /* Latin characters */
355 return uc + CifsUniLowerTable[uc]; /* Use base tables */
357 rp = CifsUniLowerRange; /* Use range tables */
359 if (uc < rp->start) /* Before start of range */
360 return uc; /* Uppercase = input */
361 if (uc <= rp->end) /* In range */
362 return uc + rp->table[uc - rp->start];
363 rp++; /* Try next range */
366 return uc; /* Past last range */
370 * UniStrlwr: Lower case a unicode string
372 static inline wchar_t *
373 UniStrlwr(register wchar_t *upin)
375 register wchar_t *up;
378 while (*up) { /* For all characters */
379 *up = UniTolower(*up);
382 return upin; /* Return input pointer */
387 #endif /* _CIFS_UNICODE_H */