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_ASTERIK     (__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_ucs2(char *to, const __le16 *from, int tolen, int fromlen,
  78                    const struct nls_table *codepage, bool mapchar);
  79 int cifs_ucs2_bytes(const __le16 *from, int maxbytes,
  80                     const struct nls_table *codepage);
  81 int cifs_strtoUCS(__le16 *, const char *, int, const struct nls_table *);
  82 char *cifs_strndup_from_ucs(const char *src, const int maxlen,
  83                             const bool is_unicode,
  84                             const struct nls_table *codepage);
  85 #endif
  86
  87 /*
  88  * UniStrcat:  Concatenate the second string to the first
  89  *
  90  * Returns:
  91  *     Address of the first string
  92  */
  93 static inline wchar_t *
  94 UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
  95 {
  96         wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
  97
  98         while (*ucs1++) ;       /* To end of first string */
  99         ucs1--;                 /* Return to the null */
 100         while ((*ucs1++ = *ucs2++)) ;   /* copy string 2 over */
 101         return anchor;
 102 }
 103
 104 /*
 105  * UniStrchr:  Find a character in a string
 106  *
 107  * Returns:
 108  *     Address of first occurrence of character in string
 109  *     or NULL if the character is not in the string
 110  */
 111 static inline wchar_t *
 112 UniStrchr(const wchar_t *ucs, wchar_t uc)
 113 {
 114         while ((*ucs != uc) && *ucs)
 115                 ucs++;
 116
 117         if (*ucs == uc)
 118                 return (wchar_t *) ucs;
 119         return NULL;
 120 }
 121
 122 /*
 123  * UniStrcmp:  Compare two strings
 124  *
 125  * Returns:
 126  *     < 0:  First string is less than second
 127  *     = 0:  Strings are equal
 128  *     > 0:  First string is greater than second
 129  */
 130 static inline int
 131 UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
 132 {
 133         while ((*ucs1 == *ucs2) && *ucs1) {
 134                 ucs1++;
 135                 ucs2++;
 136         }
 137         return (int) *ucs1 - (int) *ucs2;
 138 }
 139
 140 /*
 141  * UniStrcpy:  Copy a string
 142  */
 143 static inline wchar_t *
 144 UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
 145 {
 146         wchar_t *anchor = ucs1; /* save the start of result string */
 147
 148         while ((*ucs1++ = *ucs2++)) ;
 149         return anchor;
 150 }
 151
 152 /*
 153  * UniStrlen:  Return the length of a string (in 16 bit Unicode chars not bytes)
 154  */
 155 static inline size_t
 156 UniStrlen(const wchar_t *ucs1)
 157 {
 158         int i = 0;
 159
 160         while (*ucs1++)
 161                 i++;
 162         return i;
 163 }
 164
 165 /*
 166  * UniStrnlen:  Return the length (in 16 bit Unicode chars not bytes) of a
 167  *              string (length limited)
 168  */
 169 static inline size_t
 170 UniStrnlen(const wchar_t *ucs1, int maxlen)
 171 {
 172         int i = 0;
 173
 174         while (*ucs1++) {
 175                 i++;
 176                 if (i >= maxlen)
 177                         break;
 178         }
 179         return i;
 180 }
 181
 182 /*
 183  * UniStrncat:  Concatenate length limited string
 184  */
 185 static inline wchar_t *
 186 UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 187 {
 188         wchar_t *anchor = ucs1; /* save pointer to string 1 */
 189
 190         while (*ucs1++) ;
 191         ucs1--;                 /* point to null terminator of s1 */
 192         while (n-- && (*ucs1 = *ucs2)) {        /* copy s2 after s1 */
 193                 ucs1++;
 194                 ucs2++;
 195         }
 196         *ucs1 = 0;              /* Null terminate the result */
 197         return (anchor);
 198 }
 199
 200 /*
 201  * UniStrncmp:  Compare length limited string
 202  */
 203 static inline int
 204 UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 205 {
 206         if (!n)
 207                 return 0;       /* Null strings are equal */
 208         while ((*ucs1 == *ucs2) && *ucs1 && --n) {
 209                 ucs1++;
 210                 ucs2++;
 211         }
 212         return (int) *ucs1 - (int) *ucs2;
 213 }
 214
 215 /*
 216  * UniStrncmp_le:  Compare length limited string - native to little-endian
 217  */
 218 static inline int
 219 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 220 {
 221         if (!n)
 222                 return 0;       /* Null strings are equal */
 223         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
 224                 ucs1++;
 225                 ucs2++;
 226         }
 227         return (int) *ucs1 - (int) __le16_to_cpu(*ucs2);
 228 }
 229
 230 /*
 231  * UniStrncpy:  Copy length limited string with pad
 232  */
 233 static inline wchar_t *
 234 UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 235 {
 236         wchar_t *anchor = ucs1;
 237
 238         while (n-- && *ucs2)    /* Copy the strings */
 239                 *ucs1++ = *ucs2++;
 240
 241         n++;
 242         while (n--)             /* Pad with nulls */
 243                 *ucs1++ = 0;
 244         return anchor;
 245 }
 246
 247 /*
 248  * UniStrncpy_le:  Copy length limited string with pad to little-endian
 249  */
 250 static inline wchar_t *
 251 UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 252 {
 253         wchar_t *anchor = ucs1;
 254
 255         while (n-- && *ucs2)    /* Copy the strings */
 256                 *ucs1++ = __le16_to_cpu(*ucs2++);
 257
 258         n++;
 259         while (n--)             /* Pad with nulls */
 260                 *ucs1++ = 0;
 261         return anchor;
 262 }
 263
 264 /*
 265  * UniStrstr:  Find a string in a string
 266  *
 267  * Returns:
 268  *     Address of first match found
 269  *     NULL if no matching string is found
 270  */
 271 static inline wchar_t *
 272 UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
 273 {
 274         const wchar_t *anchor1 = ucs1;
 275         const wchar_t *anchor2 = ucs2;
 276
 277         while (*ucs1) {
 278                 if (*ucs1 == *ucs2) {
 279                         /* Partial match found */
 280                         ucs1++;
 281                         ucs2++;
 282                 } else {
 283                         if (!*ucs2)     /* Match found */
 284                                 return (wchar_t *) anchor1;
 285                         ucs1 = ++anchor1;       /* No match */
 286                         ucs2 = anchor2;
 287                 }
 288         }
 289
 290         if (!*ucs2)             /* Both end together */
 291                 return (wchar_t *) anchor1;     /* Match found */
 292         return NULL;            /* No match */
 293 }
 294
 295 #ifndef UNIUPR_NOUPPER
 296 /*
 297  * UniToupper:  Convert a unicode character to upper case
 298  */
 299 static inline wchar_t
 300 UniToupper(register wchar_t uc)
 301 {
 302         register const struct UniCaseRange *rp;
 303
 304         if (uc < sizeof(CifsUniUpperTable)) {
 305                 /* Latin characters */
 306                 return uc + CifsUniUpperTable[uc];      /* Use base tables */
 307         } else {
 308                 rp = CifsUniUpperRange; /* Use range tables */
 309                 while (rp->start) {
 310                         if (uc < rp->start)     /* Before start of range */
 311                                 return uc;      /* Uppercase = input */
 312                         if (uc <= rp->end)      /* In range */
 313                                 return uc + rp->table[uc - rp->start];
 314                         rp++;   /* Try next range */
 315                 }
 316         }
 317         return uc;              /* Past last range */
 318 }
 319
 320 /*
 321  * UniStrupr:  Upper case a unicode string
 322  */
 323 static inline wchar_t *
 324 UniStrupr(register wchar_t *upin)
 325 {
 326         register wchar_t *up;
 327
 328         up = upin;
 329         while (*up) {           /* For all characters */
 330                 *up = UniToupper(*up);
 331                 up++;
 332         }
 333         return upin;            /* Return input pointer */
 334 }
 335 #endif                          /* UNIUPR_NOUPPER */
 336
 337 #ifndef UNIUPR_NOLOWER
 338 /*
 339  * UniTolower:  Convert a unicode character to lower case
 340  */
 341 static inline wchar_t
 342 UniTolower(register wchar_t uc)
 343 {
 344         register const struct UniCaseRange *rp;
 345
 346         if (uc < sizeof(CifsUniLowerTable)) {
 347                 /* Latin characters */
 348                 return uc + CifsUniLowerTable[uc];      /* Use base tables */
 349         } else {
 350                 rp = CifsUniLowerRange; /* Use range tables */
 351                 while (rp->start) {
 352                         if (uc < rp->start)     /* Before start of range */
 353                                 return uc;      /* Uppercase = input */
 354                         if (uc <= rp->end)      /* In range */
 355                                 return uc + rp->table[uc - rp->start];
 356                         rp++;   /* Try next range */
 357                 }
 358         }
 359         return uc;              /* Past last range */
 360 }
 361
 362 /*
 363  * UniStrlwr:  Lower case a unicode string
 364  */
 365 static inline wchar_t *
 366 UniStrlwr(register wchar_t *upin)
 367 {
 368         register wchar_t *up;
 369
 370         up = upin;
 371         while (*up) {           /* For all characters */
 372                 *up = UniTolower(*up);
 373                 up++;
 374         }
 375         return upin;            /* Return input pointer */
 376 }
 377
 378 #endif
 379
 380 #endif /* _CIFS_UNICODE_H */