fs/cifs/cifs_unicode.h

   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 /*
  56  * Macs use an older "SFM" mapping of the symbols above. Fortunately it does
  57  * not conflict (although almost does) with the mapping above.
  58  */
  59
  60 #define SFM_DOUBLEQUOTE ((__u16) 0xF020)
  61 #define SFM_ASTERISK    ((__u16) 0xF021)
  62 #define SFM_QUESTION    ((__u16) 0xF025)
  63 #define SFM_COLON       ((__u16) 0xF022)
  64 #define SFM_GRTRTHAN    ((__u16) 0xF024)
  65 #define SFM_LESSTHAN    ((__u16) 0xF023)
  66 #define SFM_PIPE        ((__u16) 0xF027)
  67 #define SFM_SLASH       ((__u16) 0xF026)
  68 #define SFM_SPACE       ((__u16) 0xF028)
  69 #define SFM_PERIOD      ((__u16) 0xF029)
  70
  71 /*
  72  * Mapping mechanism to use when one of the seven reserved characters is
  73  * encountered.  We can only map using one of the mechanisms at a time
  74  * since otherwise readdir could return directory entries which we would
  75  * not be able to open
  76  *
  77  * NO_MAP_UNI_RSVD  = do not perform any remapping of the character
  78  * SFM_MAP_UNI_RSVD = map reserved characters using SFM scheme (MAC compatible)
  79  * SFU_MAP_UNI_RSVD = map reserved characters ala SFU ("mapchars" option)
  80  *
  81  */
  82 #define NO_MAP_UNI_RSVD         0
  83 #define SFM_MAP_UNI_RSVD        1
  84 #define SFU_MAP_UNI_RSVD        2
  85
  86 /* Just define what we want from uniupr.h.  We don't want to define the tables
  87  * in each source file.
  88  */
  89 #ifndef UNICASERANGE_DEFINED
  90 struct UniCaseRange {
  91         wchar_t start;
  92         wchar_t end;
  93         signed char *table;
  94 };
  95 #endif                          /* UNICASERANGE_DEFINED */
  96
  97 #ifndef UNIUPR_NOUPPER
  98 extern signed char CifsUniUpperTable[512];
  99 extern const struct UniCaseRange CifsUniUpperRange[];
 100 #endif                          /* UNIUPR_NOUPPER */
 101
 102 #ifndef UNIUPR_NOLOWER
 103 extern signed char CifsUniLowerTable[512];
 104 extern const struct UniCaseRange CifsUniLowerRange[];
 105 #endif                          /* UNIUPR_NOLOWER */
 106
 107 #ifdef __KERNEL__
 108 int cifs_from_utf16(char *to, const __le16 *from, int tolen, int fromlen,
 109                     const struct nls_table *cp, int map_type);
 110 int cifs_utf16_bytes(const __le16 *from, int maxbytes,
 111                      const struct nls_table *codepage);
 112 int cifs_strtoUTF16(__le16 *, const char *, int, const struct nls_table *);
 113 char *cifs_strndup_from_utf16(const char *src, const int maxlen,
 114                               const bool is_unicode,
 115                               const struct nls_table *codepage);
 116 extern int cifsConvertToUTF16(__le16 *target, const char *source, int maxlen,
 117                               const struct nls_table *cp, int mapChars);
 118 extern int cifs_remap(struct cifs_sb_info *cifs_sb);
 119 extern __le16 *cifs_strndup_to_utf16(const char *src, const int maxlen,
 120                                      int *utf16_len, const struct nls_table *cp,
 121                                      int remap);
 122 #endif
 123
 124 wchar_t cifs_toupper(wchar_t in);
 125
 126 /*
 127  * UniStrcat:  Concatenate the second string to the first
 128  *
 129  * Returns:
 130  *     Address of the first string
 131  */
 132 static inline __le16 *
 133 UniStrcat(__le16 *ucs1, const __le16 *ucs2)
 134 {
 135         __le16 *anchor = ucs1;  /* save a pointer to start of ucs1 */
 136
 137         while (*ucs1++) ;       /* To end of first string */
 138         ucs1--;                 /* Return to the null */
 139         while ((*ucs1++ = *ucs2++)) ;   /* copy string 2 over */
 140         return anchor;
 141 }
 142
 143 /*
 144  * UniStrchr:  Find a character in a string
 145  *
 146  * Returns:
 147  *     Address of first occurrence of character in string
 148  *     or NULL if the character is not in the string
 149  */
 150 static inline wchar_t *
 151 UniStrchr(const wchar_t *ucs, wchar_t uc)
 152 {
 153         while ((*ucs != uc) && *ucs)
 154                 ucs++;
 155
 156         if (*ucs == uc)
 157                 return (wchar_t *) ucs;
 158         return NULL;
 159 }
 160
 161 /*
 162  * UniStrcmp:  Compare two strings
 163  *
 164  * Returns:
 165  *     < 0:  First string is less than second
 166  *     = 0:  Strings are equal
 167  *     > 0:  First string is greater than second
 168  */
 169 static inline int
 170 UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
 171 {
 172         while ((*ucs1 == *ucs2) && *ucs1) {
 173                 ucs1++;
 174                 ucs2++;
 175         }
 176         return (int) *ucs1 - (int) *ucs2;
 177 }
 178
 179 /*
 180  * UniStrcpy:  Copy a string
 181  */
 182 static inline wchar_t *
 183 UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
 184 {
 185         wchar_t *anchor = ucs1; /* save the start of result string */
 186
 187         while ((*ucs1++ = *ucs2++)) ;
 188         return anchor;
 189 }
 190
 191 /*
 192  * UniStrlen:  Return the length of a string (in 16 bit Unicode chars not bytes)
 193  */
 194 static inline size_t
 195 UniStrlen(const wchar_t *ucs1)
 196 {
 197         int i = 0;
 198
 199         while (*ucs1++)
 200                 i++;
 201         return i;
 202 }
 203
 204 /*
 205  * UniStrnlen:  Return the length (in 16 bit Unicode chars not bytes) of a
 206  *              string (length limited)
 207  */
 208 static inline size_t
 209 UniStrnlen(const wchar_t *ucs1, int maxlen)
 210 {
 211         int i = 0;
 212
 213         while (*ucs1++) {
 214                 i++;
 215                 if (i >= maxlen)
 216                         break;
 217         }
 218         return i;
 219 }
 220
 221 /*
 222  * UniStrncat:  Concatenate length limited string
 223  */
 224 static inline wchar_t *
 225 UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 226 {
 227         wchar_t *anchor = ucs1; /* save pointer to string 1 */
 228
 229         while (*ucs1++) ;
 230         ucs1--;                 /* point to null terminator of s1 */
 231         while (n-- && (*ucs1 = *ucs2)) {        /* copy s2 after s1 */
 232                 ucs1++;
 233                 ucs2++;
 234         }
 235         *ucs1 = 0;              /* Null terminate the result */
 236         return (anchor);
 237 }
 238
 239 /*
 240  * UniStrncmp:  Compare length limited string
 241  */
 242 static inline int
 243 UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 244 {
 245         if (!n)
 246                 return 0;       /* Null strings are equal */
 247         while ((*ucs1 == *ucs2) && *ucs1 && --n) {
 248                 ucs1++;
 249                 ucs2++;
 250         }
 251         return (int) *ucs1 - (int) *ucs2;
 252 }
 253
 254 /*
 255  * UniStrncmp_le:  Compare length limited string - native to little-endian
 256  */
 257 static inline int
 258 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 259 {
 260         if (!n)
 261                 return 0;       /* Null strings are equal */
 262         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
 263                 ucs1++;
 264                 ucs2++;
 265         }
 266         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
 267 }
 268
 269 /*
 270  * UniStrncpy:  Copy length limited string with pad
 271  */
 272 static inline wchar_t *
 273 UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 274 {
 275         wchar_t *anchor = ucs1;
 276
 277         while (n-- && *ucs2)    /* Copy the strings */
 278                 *ucs1++ = *ucs2++;
 279
 280         n++;
 281         while (n--)             /* Pad with nulls */
 282                 *ucs1++ = 0;
 283         return anchor;
 284 }
 285
 286 /*
 287  * UniStrncpy_le:  Copy length limited string with pad to little-endian
 288  */
 289 static inline wchar_t *
 290 UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 291 {
 292         wchar_t *anchor = ucs1;
 293
 294         while (n-- && *ucs2)    /* Copy the strings */
 295                 *ucs1++ = __le16_to_cpu(*ucs2++);
 296
 297         n++;
 298         while (n--)             /* Pad with nulls */
 299                 *ucs1++ = 0;
 300         return anchor;
 301 }
 302
 303 /*
 304  * UniStrstr:  Find a string in a string
 305  *
 306  * Returns:
 307  *     Address of first match found
 308  *     NULL if no matching string is found
 309  */
 310 static inline wchar_t *
 311 UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
 312 {
 313         const wchar_t *anchor1 = ucs1;
 314         const wchar_t *anchor2 = ucs2;
 315
 316         while (*ucs1) {
 317                 if (*ucs1 == *ucs2) {
 318                         /* Partial match found */
 319                         ucs1++;
 320                         ucs2++;
 321                 } else {
 322                         if (!*ucs2)     /* Match found */
 323                                 return (wchar_t *) anchor1;
 324                         ucs1 = ++anchor1;       /* No match */
 325                         ucs2 = anchor2;
 326                 }
 327         }
 328
 329         if (!*ucs2)             /* Both end together */
 330                 return (wchar_t *) anchor1;     /* Match found */
 331         return NULL;            /* No match */
 332 }
 333
 334 #ifndef UNIUPR_NOUPPER
 335 /*
 336  * UniToupper:  Convert a unicode character to upper case
 337  */
 338 static inline wchar_t
 339 UniToupper(register wchar_t uc)
 340 {
 341         register const struct UniCaseRange *rp;
 342
 343         if (uc < sizeof(CifsUniUpperTable)) {
 344                 /* Latin characters */
 345                 return uc + CifsUniUpperTable[uc];      /* Use base tables */
 346         } else {
 347                 rp = CifsUniUpperRange; /* Use range tables */
 348                 while (rp->start) {
 349                         if (uc < rp->start)     /* Before start of range */
 350                                 return uc;      /* Uppercase = input */
 351                         if (uc <= rp->end)      /* In range */
 352                                 return uc + rp->table[uc - rp->start];
 353                         rp++;   /* Try next range */
 354                 }
 355         }
 356         return uc;              /* Past last range */
 357 }
 358
 359 /*
 360  * UniStrupr:  Upper case a unicode string
 361  */
 362 static inline __le16 *
 363 UniStrupr(register __le16 *upin)
 364 {
 365         register __le16 *up;
 366
 367         up = upin;
 368         while (*up) {           /* For all characters */
 369                 *up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
 370                 up++;
 371         }
 372         return upin;            /* Return input pointer */
 373 }
 374 #endif                          /* UNIUPR_NOUPPER */
 375
 376 #ifndef UNIUPR_NOLOWER
 377 /*
 378  * UniTolower:  Convert a unicode character to lower case
 379  */
 380 static inline wchar_t
 381 UniTolower(register wchar_t uc)
 382 {
 383         register const struct UniCaseRange *rp;
 384
 385         if (uc < sizeof(CifsUniLowerTable)) {
 386                 /* Latin characters */
 387                 return uc + CifsUniLowerTable[uc];      /* Use base tables */
 388         } else {
 389                 rp = CifsUniLowerRange; /* Use range tables */
 390                 while (rp->start) {
 391                         if (uc < rp->start)     /* Before start of range */
 392                                 return uc;      /* Uppercase = input */
 393                         if (uc <= rp->end)      /* In range */
 394                                 return uc + rp->table[uc - rp->start];
 395                         rp++;   /* Try next range */
 396                 }
 397         }
 398         return uc;              /* Past last range */
 399 }
 400
 401 /*
 402  * UniStrlwr:  Lower case a unicode string
 403  */
 404 static inline wchar_t *
 405 UniStrlwr(register wchar_t *upin)
 406 {
 407         register wchar_t *up;
 408
 409         up = upin;
 410         while (*up) {           /* For all characters */
 411                 *up = UniTolower(*up);
 412                 up++;
 413         }
 414         return upin;            /* Return input pointer */
 415 }
 416
 417 #endif
 418
 419 #endif /* _CIFS_UNICODE_H */