fs/ksmbd/unicode.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * Some of the source code in this file came from fs/cifs/cifs_unicode.c
   4  * cifs_unicode:  Unicode kernel case support
   5  *
   6  * Function:
   7  *     Convert a unicode character to upper or lower case using
   8  *     compressed tables.
   9  *
  10  *   Copyright (c) International Business Machines  Corp., 2000,2009
  11  *
  12  *
  13  * Notes:
  14  *     These APIs are based on the C library functions.  The semantics
  15  *     should match the C functions but with expanded size operands.
  16  *
  17  *     The upper/lower functions are based on a table created by mkupr.
  18  *     This is a compressed table of upper and lower case conversion.
  19  *
  20  */
  21 #ifndef _CIFS_UNICODE_H
  22 #define _CIFS_UNICODE_H
  23
  24 #include <asm/byteorder.h>
  25 #include <linux/types.h>
  26 #include <linux/nls.h>
  27
  28 #define  UNIUPR_NOLOWER         /* Example to not expand lower case tables */
  29
  30 /*
  31  * Windows maps these to the user defined 16 bit Unicode range since they are
  32  * reserved symbols (along with \ and /), otherwise illegal to store
  33  * in filenames in NTFS
  34  */
  35 #define UNI_ASTERISK    ((__u16)('*' + 0xF000))
  36 #define UNI_QUESTION    ((__u16)('?' + 0xF000))
  37 #define UNI_COLON       ((__u16)(':' + 0xF000))
  38 #define UNI_GRTRTHAN    ((__u16)('>' + 0xF000))
  39 #define UNI_LESSTHAN    ((__u16)('<' + 0xF000))
  40 #define UNI_PIPE        ((__u16)('|' + 0xF000))
  41 #define UNI_SLASH       ((__u16)('\\' + 0xF000))
  42
  43 /* Just define what we want from uniupr.h.  We don't want to define the tables
  44  * in each source file.
  45  */
  46 #ifndef UNICASERANGE_DEFINED
  47 struct UniCaseRange {
  48         wchar_t start;
  49         wchar_t end;
  50         signed char *table;
  51 };
  52 #endif                          /* UNICASERANGE_DEFINED */
  53
  54 #ifndef UNIUPR_NOUPPER
  55 extern signed char SmbUniUpperTable[512];
  56 extern const struct UniCaseRange SmbUniUpperRange[];
  57 #endif                          /* UNIUPR_NOUPPER */
  58
  59 #ifndef UNIUPR_NOLOWER
  60 extern signed char CifsUniLowerTable[512];
  61 extern const struct UniCaseRange CifsUniLowerRange[];
  62 #endif                          /* UNIUPR_NOLOWER */
  63
  64 #ifdef __KERNEL__
  65 int smb_strtoUTF16(__le16 *to, const char *from, int len,
  66                    const struct nls_table *codepage);
  67 char *smb_strndup_from_utf16(const char *src, const int maxlen,
  68                              const bool is_unicode,
  69                              const struct nls_table *codepage);
  70 int smbConvertToUTF16(__le16 *target, const char *source, int srclen,
  71                       const struct nls_table *cp, int mapchars);
  72 char *ksmbd_extract_sharename(char *treename);
  73 #endif
  74
  75 /*
  76  * UniStrcat:  Concatenate the second string to the first
  77  *
  78  * Returns:
  79  *     Address of the first string
  80  */
  81 static inline wchar_t *UniStrcat(wchar_t *ucs1, const wchar_t *ucs2)
  82 {
  83         wchar_t *anchor = ucs1; /* save a pointer to start of ucs1 */
  84
  85         while (*ucs1++)
  86         /*NULL*/;       /* To end of first string */
  87         ucs1--;                 /* Return to the null */
  88         while ((*ucs1++ = *ucs2++))
  89         /*NULL*/;       /* copy string 2 over */
  90         return anchor;
  91 }
  92
  93 /*
  94  * UniStrchr:  Find a character in a string
  95  *
  96  * Returns:
  97  *     Address of first occurrence of character in string
  98  *     or NULL if the character is not in the string
  99  */
 100 static inline wchar_t *UniStrchr(const wchar_t *ucs, wchar_t uc)
 101 {
 102         while ((*ucs != uc) && *ucs)
 103                 ucs++;
 104
 105         if (*ucs == uc)
 106                 return (wchar_t *)ucs;
 107         return NULL;
 108 }
 109
 110 /*
 111  * UniStrcmp:  Compare two strings
 112  *
 113  * Returns:
 114  *     < 0:  First string is less than second
 115  *     = 0:  Strings are equal
 116  *     > 0:  First string is greater than second
 117  */
 118 static inline int UniStrcmp(const wchar_t *ucs1, const wchar_t *ucs2)
 119 {
 120         while ((*ucs1 == *ucs2) && *ucs1) {
 121                 ucs1++;
 122                 ucs2++;
 123         }
 124         return (int)*ucs1 - (int)*ucs2;
 125 }
 126
 127 /*
 128  * UniStrcpy:  Copy a string
 129  */
 130 static inline wchar_t *UniStrcpy(wchar_t *ucs1, const wchar_t *ucs2)
 131 {
 132         wchar_t *anchor = ucs1; /* save the start of result string */
 133
 134         while ((*ucs1++ = *ucs2++))
 135         /*NULL*/;
 136         return anchor;
 137 }
 138
 139 /*
 140  * UniStrlen:  Return the length of a string (in 16 bit Unicode chars not bytes)
 141  */
 142 static inline size_t UniStrlen(const wchar_t *ucs1)
 143 {
 144         int i = 0;
 145
 146         while (*ucs1++)
 147                 i++;
 148         return i;
 149 }
 150
 151 /*
 152  * UniStrnlen:  Return the length (in 16 bit Unicode chars not bytes) of a
 153  *              string (length limited)
 154  */
 155 static inline size_t UniStrnlen(const wchar_t *ucs1, int maxlen)
 156 {
 157         int i = 0;
 158
 159         while (*ucs1++) {
 160                 i++;
 161                 if (i >= maxlen)
 162                         break;
 163         }
 164         return i;
 165 }
 166
 167 /*
 168  * UniStrncat:  Concatenate length limited string
 169  */
 170 static inline wchar_t *UniStrncat(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 171 {
 172         wchar_t *anchor = ucs1; /* save pointer to string 1 */
 173
 174         while (*ucs1++)
 175         /*NULL*/;
 176         ucs1--;                 /* point to null terminator of s1 */
 177         while (n-- && (*ucs1 = *ucs2)) {        /* copy s2 after s1 */
 178                 ucs1++;
 179                 ucs2++;
 180         }
 181         *ucs1 = 0;              /* Null terminate the result */
 182         return anchor;
 183 }
 184
 185 /*
 186  * UniStrncmp:  Compare length limited string
 187  */
 188 static inline int UniStrncmp(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 189 {
 190         if (!n)
 191                 return 0;       /* Null strings are equal */
 192         while ((*ucs1 == *ucs2) && *ucs1 && --n) {
 193                 ucs1++;
 194                 ucs2++;
 195         }
 196         return (int)*ucs1 - (int)*ucs2;
 197 }
 198
 199 /*
 200  * UniStrncmp_le:  Compare length limited string - native to little-endian
 201  */
 202 static inline int
 203 UniStrncmp_le(const wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 204 {
 205         if (!n)
 206                 return 0;       /* Null strings are equal */
 207         while ((*ucs1 == __le16_to_cpu(*ucs2)) && *ucs1 && --n) {
 208                 ucs1++;
 209                 ucs2++;
 210         }
 211         return (int)*ucs1 - (int)__le16_to_cpu(*ucs2);
 212 }
 213
 214 /*
 215  * UniStrncpy:  Copy length limited string with pad
 216  */
 217 static inline wchar_t *UniStrncpy(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 218 {
 219         wchar_t *anchor = ucs1;
 220
 221         while (n-- && *ucs2)    /* Copy the strings */
 222                 *ucs1++ = *ucs2++;
 223
 224         n++;
 225         while (n--)             /* Pad with nulls */
 226                 *ucs1++ = 0;
 227         return anchor;
 228 }
 229
 230 /*
 231  * UniStrncpy_le:  Copy length limited string with pad to little-endian
 232  */
 233 static inline wchar_t *UniStrncpy_le(wchar_t *ucs1, const wchar_t *ucs2, size_t n)
 234 {
 235         wchar_t *anchor = ucs1;
 236
 237         while (n-- && *ucs2)    /* Copy the strings */
 238                 *ucs1++ = __le16_to_cpu(*ucs2++);
 239
 240         n++;
 241         while (n--)             /* Pad with nulls */
 242                 *ucs1++ = 0;
 243         return anchor;
 244 }
 245
 246 /*
 247  * UniStrstr:  Find a string in a string
 248  *
 249  * Returns:
 250  *     Address of first match found
 251  *     NULL if no matching string is found
 252  */
 253 static inline wchar_t *UniStrstr(const wchar_t *ucs1, const wchar_t *ucs2)
 254 {
 255         const wchar_t *anchor1 = ucs1;
 256         const wchar_t *anchor2 = ucs2;
 257
 258         while (*ucs1) {
 259                 if (*ucs1 == *ucs2) {
 260                         /* Partial match found */
 261                         ucs1++;
 262                         ucs2++;
 263                 } else {
 264                         if (!*ucs2)     /* Match found */
 265                                 return (wchar_t *)anchor1;
 266                         ucs1 = ++anchor1;       /* No match */
 267                         ucs2 = anchor2;
 268                 }
 269         }
 270
 271         if (!*ucs2)             /* Both end together */
 272                 return (wchar_t *)anchor1;      /* Match found */
 273         return NULL;            /* No match */
 274 }
 275
 276 #ifndef UNIUPR_NOUPPER
 277 /*
 278  * UniToupper:  Convert a unicode character to upper case
 279  */
 280 static inline wchar_t UniToupper(register wchar_t uc)
 281 {
 282         register const struct UniCaseRange *rp;
 283
 284         if (uc < sizeof(SmbUniUpperTable)) {
 285                 /* Latin characters */
 286                 return uc + SmbUniUpperTable[uc];       /* Use base tables */
 287         }
 288
 289         rp = SmbUniUpperRange;  /* Use range tables */
 290         while (rp->start) {
 291                 if (uc < rp->start)     /* Before start of range */
 292                         return uc;      /* Uppercase = input */
 293                 if (uc <= rp->end)      /* In range */
 294                         return uc + rp->table[uc - rp->start];
 295                 rp++;   /* Try next range */
 296         }
 297         return uc;              /* Past last range */
 298 }
 299
 300 /*
 301  * UniStrupr:  Upper case a unicode string
 302  */
 303 static inline __le16 *UniStrupr(register __le16 *upin)
 304 {
 305         register __le16 *up;
 306
 307         up = upin;
 308         while (*up) {           /* For all characters */
 309                 *up = cpu_to_le16(UniToupper(le16_to_cpu(*up)));
 310                 up++;
 311         }
 312         return upin;            /* Return input pointer */
 313 }
 314 #endif                          /* UNIUPR_NOUPPER */
 315
 316 #ifndef UNIUPR_NOLOWER
 317 /*
 318  * UniTolower:  Convert a unicode character to lower case
 319  */
 320 static inline wchar_t UniTolower(register wchar_t uc)
 321 {
 322         register const struct UniCaseRange *rp;
 323
 324         if (uc < sizeof(CifsUniLowerTable)) {
 325                 /* Latin characters */
 326                 return uc + CifsUniLowerTable[uc];      /* Use base tables */
 327         }
 328
 329         rp = CifsUniLowerRange; /* Use range tables */
 330         while (rp->start) {
 331                 if (uc < rp->start)     /* Before start of range */
 332                         return uc;      /* Uppercase = input */
 333                 if (uc <= rp->end)      /* In range */
 334                         return uc + rp->table[uc - rp->start];
 335                 rp++;   /* Try next range */
 336         }
 337         return uc;              /* Past last range */
 338 }
 339
 340 /*
 341  * UniStrlwr:  Lower case a unicode string
 342  */
 343 static inline wchar_t *UniStrlwr(register wchar_t *upin)
 344 {
 345         register wchar_t *up;
 346
 347         up = upin;
 348         while (*up) {           /* For all characters */
 349                 *up = UniTolower(*up);
 350                 up++;
 351         }
 352         return upin;            /* Return input pointer */
 353 }
 354
 355 #endif
 356
 357 #endif /* _CIFS_UNICODE_H */