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Linux/fs/cifs/cifs_unicode.h

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  1 /*
  2  * cifs_unicode:  Unicode kernel case support
  3  *
  4  * Function:
  5  *     Convert a unicode character to upper or lower case using
  6  *     compressed tables.
  7  *
  8  *   Copyright (c) International Business Machines  Corp., 2000,2009
  9  *
 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.
 14  *
 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.
 19  *
 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
 23  *
 24  *
 25  * Notes:
 26  *     These APIs are based on the C library functions.  The semantics
 27  *     should match the C functions but with expanded size operands.
 28  *
 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.
 31  *
 32  */
 33 #ifndef _CIFS_UNICODE_H
 34 #define _CIFS_UNICODE_H
 35 
 36 #include <asm/byteorder.h>
 37 #include <linux/types.h>
 38 #include <linux/nls.h>
 39 
 40 #define  UNIUPR_NOLOWER         /* Example to not expand lower case tables */
 41 
 42 /*
 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
 46  */
 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)
 54 
 55 /* Just define what we want from uniupr.h.  We don't want to define the tables
 56  * in each source file.
 57  */
 58 #ifndef UNICASERANGE_DEFINED
 59 struct UniCaseRange {
 60         wchar_t start;
 61         wchar_t end;
 62         signed char *table;
 63 };
 64 #endif                          /* UNICASERANGE_DEFINED */
 65 
 66 #ifndef UNIUPR_NOUPPER
 67 extern signed char CifsUniUpperTable[512];
 68 extern const struct UniCaseRange CifsUniUpperRange[];
 69 #endif                          /* UNIUPR_NOUPPER */
 70 
 71 #ifndef UNIUPR_NOLOWER
 72 extern signed char CifsUniLowerTable[512];
 73 extern const struct UniCaseRange CifsUniLowerRange[];
 74 #endif                          /* UNIUPR_NOLOWER */
 75 
 76 #ifdef __KERNEL__
 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,
 90                                      int remap);
 91 #endif /* CONFIG_CIFS_SMB2 */
 92 #endif
 93 
 94 wchar_t cifs_toupper(wchar_t in);
 95 
 96 /*
 97  * UniStrcat:  Concatenate the second string to the first
 98  *
 99  * Returns:
100  *     Address of the first string
101  */
102 static inline wchar_t *
103 UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
104 {
105         wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
106 
107         while (*ucs1++) ;       /* To end of first string */
108         ucs1--;                 /* Return to the null */
109         while ((*ucs1++ = *ucs2++)) ;   /* copy string 2 over */
110         return anchor;
111 }
112 
113 /*
114  * UniStrchr:  Find a character in a string
115  *
116  * Returns:
117  *     Address of first occurrence of character in string
118  *     or NULL if the character is not in the string
119  */
120 static inline wchar_t *
121 UniStrchr(const wchar_t *ucs, wchar_t uc)
122 {
123         while ((*ucs != uc) && *ucs)
124                 ucs++;
125 
126         if (*ucs == uc)
127                 return (wchar_t *) ucs;
128         return NULL;
129 }
130 
131 /*
132  * UniStrcmp:  Compare two strings
133  *
134  * Returns:
135  *     < 0:  First string is less than second
136  *     = 0:  Strings are equal
137  *     > 0:  First string is greater than second
138  */
139 static inline int
140 UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
141 {
142         while ((*ucs1 == *ucs2) && *ucs1) {
143                 ucs1++;
144                 ucs2++;
145         }
146         return (int) *ucs1 - (int) *ucs2;
147 }
148 
149 /*
150  * UniStrcpy:  Copy a string
151  */
152 static inline wchar_t *
153 UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
154 {
155         wchar_t *anchor = ucs1; /* save the start of result string */
156 
157         while ((*ucs1++ = *ucs2++)) ;
158         return anchor;
159 }
160 
161 /*
162  * UniStrlen:  Return the length of a string (in 16 bit Unicode chars not bytes)
163  */
164 static inline size_t
165 UniStrlen(const wchar_t *ucs1)
166 {
167         int i = 0;
168 
169         while (*ucs1++)
170                 i++;
171         return i;
172 }
173 
174 /*
175  * UniStrnlen:  Return the length (in 16 bit Unicode chars not bytes) of a
176  *              string (length limited)
177  */
178 static inline size_t
179 UniStrnlen(const wchar_t *ucs1, int maxlen)
180 {
181         int i = 0;
182 
183         while (*ucs1++) {
184                 i++;
185                 if (i >= maxlen)
186                         break;
187         }
188         return i;
189 }
190 
191 /*
192  * UniStrncat:  Concatenate length limited string
193  */
194 static inline wchar_t *
195 UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
196 {
197         wchar_t *anchor = ucs1; /* save pointer to string 1 */
198 
199         while (*ucs1++) ;
200         ucs1--;                 /* point to null terminator of s1 */
201         while (n-- && (*ucs1 = *ucs2)) {        /* copy s2 after s1 */
202                 ucs1++;
203                 ucs2++;
204         }
205         *ucs1 = 0;              /* Null terminate the result */
206         return (anchor);
207 }
208 
209 /*
210  * UniStrncmp:  Compare length limited string
211  */
212 static inline int
213 UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
214 {
215         if (!n)
216                 return 0;       /* Null strings are equal */
217         while ((*ucs1 == *ucs2) && *ucs1 && --n) {
218                 ucs1++;
219                 ucs2++;
220         }
221         return (int) *ucs1 - (int) *ucs2;
222 }
223 
224 /*
225  * UniStrncmp_le:  Compare length limited string - native to little-endian
226  */
227 static inline int
228 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
229 {
230         if (!n)
231                 return 0;       /* Null strings are equal */
232         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
233                 ucs1++;
234                 ucs2++;
235         }
236         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
237 }
238 
239 /*
240  * UniStrncpy:  Copy length limited string with pad
241  */
242 static inline wchar_t *
243 UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
244 {
245         wchar_t *anchor = ucs1;
246 
247         while (n-- && *ucs2)    /* Copy the strings */
248                 *ucs1++ = *ucs2++;
249 
250         n++;
251         while (n--)             /* Pad with nulls */
252                 *ucs1++ = 0;
253         return anchor;
254 }
255 
256 /*
257  * UniStrncpy_le:  Copy length limited string with pad to little-endian
258  */
259 static inline wchar_t *
260 UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
261 {
262         wchar_t *anchor = ucs1;
263 
264         while (n-- && *ucs2)    /* Copy the strings */
265                 *ucs1++ = __le16_to_cpu(*ucs2++);
266 
267         n++;
268         while (n--)             /* Pad with nulls */
269                 *ucs1++ = 0;
270         return anchor;
271 }
272 
273 /*
274  * UniStrstr:  Find a string in a string
275  *
276  * Returns:
277  *     Address of first match found
278  *     NULL if no matching string is found
279  */
280 static inline wchar_t *
281 UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
282 {
283         const wchar_t *anchor1 = ucs1;
284         const wchar_t *anchor2 = ucs2;
285 
286         while (*ucs1) {
287                 if (*ucs1 == *ucs2) {
288                         /* Partial match found */
289                         ucs1++;
290                         ucs2++;
291                 } else {
292                         if (!*ucs2)     /* Match found */
293                                 return (wchar_t *) anchor1;
294                         ucs1 = ++anchor1;       /* No match */
295                         ucs2 = anchor2;
296                 }
297         }
298 
299         if (!*ucs2)             /* Both end together */
300                 return (wchar_t *) anchor1;     /* Match found */
301         return NULL;            /* No match */
302 }
303 
304 #ifndef UNIUPR_NOUPPER
305 /*
306  * UniToupper:  Convert a unicode character to upper case
307  */
308 static inline wchar_t
309 UniToupper(register wchar_t uc)
310 {
311         register const struct UniCaseRange *rp;
312 
313         if (uc < sizeof(CifsUniUpperTable)) {
314                 /* Latin characters */
315                 return uc + CifsUniUpperTable[uc];      /* Use base tables */
316         } else {
317                 rp = CifsUniUpperRange; /* Use range tables */
318                 while (rp->start) {
319                         if (uc < rp->start)     /* Before start of range */
320                                 return uc;      /* Uppercase = input */
321                         if (uc <= rp->end)      /* In range */
322                                 return uc + rp->table[uc - rp->start];
323                         rp++;   /* Try next range */
324                 }
325         }
326         return uc;              /* Past last range */
327 }
328 
329 /*
330  * UniStrupr:  Upper case a unicode string
331  */
332 static inline __le16 *
333 UniStrupr(register __le16 *upin)
334 {
335         register __le16 *up;
336 
337         up = upin;
338         while (*up) {           /* For all characters */
339                 *up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
340                 up++;
341         }
342         return upin;            /* Return input pointer */
343 }
344 #endif                          /* UNIUPR_NOUPPER */
345 
346 #ifndef UNIUPR_NOLOWER
347 /*
348  * UniTolower:  Convert a unicode character to lower case
349  */
350 static inline wchar_t
351 UniTolower(register wchar_t uc)
352 {
353         register const struct UniCaseRange *rp;
354 
355         if (uc < sizeof(CifsUniLowerTable)) {
356                 /* Latin characters */
357                 return uc + CifsUniLowerTable[uc];      /* Use base tables */
358         } else {
359                 rp = CifsUniLowerRange; /* Use range tables */
360                 while (rp->start) {
361                         if (uc < rp->start)     /* Before start of range */
362                                 return uc;      /* Uppercase = input */
363                         if (uc <= rp->end)      /* In range */
364                                 return uc + rp->table[uc - rp->start];
365                         rp++;   /* Try next range */
366                 }
367         }
368         return uc;              /* Past last range */
369 }
370 
371 /*
372  * UniStrlwr:  Lower case a unicode string
373  */
374 static inline wchar_t *
375 UniStrlwr(register wchar_t *upin)
376 {
377         register wchar_t *up;
378 
379         up = upin;
380         while (*up) {           /* For all characters */
381                 *up = UniTolower(*up);
382                 up++;
383         }
384         return upin;            /* Return input pointer */
385 }
386 
387 #endif
388 
389 #endif /* _CIFS_UNICODE_H */
390 

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