include/wx/strconv.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        strconv.h
   3 // Purpose:     conversion routines for char sets any Unicode
   4 // Author:      Ove Kaaven, Robert Roebling, Vadim Zeitlin
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1998 Ove Kaaven, Robert Roebling
   9 //              (c) 1998-2006 Vadim Zeitlin
  10 // Licence:     wxWindows licence
  11 ///////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef _WX_STRCONV_H_
  14 #define _WX_STRCONV_H_
  15
  16 #include "wx/defs.h"
  17 #include "wx/chartype.h"
  18 #include "wx/buffer.h"
  19
  20 #ifdef __DIGITALMARS__
  21 #include "typeinfo.h"
  22 #endif
  23
  24 #if defined(__VISAGECPP__) && __IBMCPP__ >= 400
  25 #  undef __BSEXCPT__
  26 #endif
  27
  28 #include <stdlib.h>
  29
  30 #if wxUSE_WCHAR_T
  31
  32 class WXDLLIMPEXP_BASE wxString;
  33
  34 // the error value returned by wxMBConv methods
  35 #define wxCONV_FAILED ((size_t)-1)
  36
  37 // the default value for some length parameters meaning that the string is
  38 // NUL-terminated
  39 #define wxNO_LEN ((size_t)-1)
  40
  41 // ----------------------------------------------------------------------------
  42 // wxMBConv (abstract base class for conversions)
  43 // ----------------------------------------------------------------------------
  44
  45 // When deriving a new class from wxMBConv you must reimplement ToWChar() and
  46 // FromWChar() methods which are not pure virtual only for historical reasons,
  47 // don't let the fact that the existing classes implement MB2WC/WC2MB() instead
  48 // confuse you.
  49 //
  50 // You also have to implement Clone() to allow copying the conversions
  51 // polymorphically.
  52 //
  53 // And you might need to override GetMBNulLen() as well.
  54 class WXDLLIMPEXP_BASE wxMBConv
  55 {
  56 public:
  57     // The functions doing actual conversion from/to narrow to/from wide
  58     // character strings.
  59     //
  60     // On success, the return value is the length (i.e. the number of
  61     // characters, not bytes) of the converted string including any trailing
  62     // L'\0' or (possibly multiple) '\0'(s). If the conversion fails or if
  63     // there is not enough space for everything, including the trailing NUL
  64     // character(s), in the output buffer, wxCONV_FAILED is returned.
  65     //
  66     // In the special case when dstLen is 0 (outputBuf may be NULL then) the
  67     // return value is the length of the needed buffer but nothing happens
  68     // otherwise. If srcLen is wxNO_LEN, the entire string, up to and
  69     // including the trailing NUL(s), is converted, otherwise exactly srcLen
  70     // bytes are.
  71     //
  72     // Typical usage:
  73     //
  74     //          size_t dstLen = conv.ToWChar(NULL, 0, src);
  75     //          if ( dstLen != wxCONV_FAILED )
  76     //              ... handle error ...
  77     //          wchar_t *wbuf = new wchar_t[dstLen];
  78     //          conv.ToWChar(wbuf, dstLen, src);
  79     //
  80     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
  81                            const char *src, size_t srcLen = wxNO_LEN) const;
  82
  83     virtual size_t FromWChar(char *dst, size_t dstLen,
  84                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
  85
  86
  87     // Convenience functions for translating NUL-terminated strings: returns
  88     // the buffer containing the converted string or NULL pointer if the
  89     // conversion failed.
  90     const wxWCharBuffer cMB2WC(const char *in) const;
  91     const wxCharBuffer cWC2MB(const wchar_t *in) const;
  92
  93     // Convenience functions for converting strings which may contain embedded
  94     // NULs and don't have to be NUL-terminated.
  95     //
  96     // inLen is the length of the buffer including trailing NUL if any: if the
  97     // last 4 bytes of the buffer are all NULs, these functions are more
  98     // efficient as they avoid copying the string, but otherwise a copy is made
  99     // internally which could be quite bad for (very) long strings.
 100     //
 101     // outLen receives, if not NULL, the length of the converted string or 0 if
 102     // the conversion failed (returning 0 and not -1 in this case makes it
 103     // difficult to distinguish between failed conversion and empty input but
 104     // this is done for backwards compatibility)
 105     const wxWCharBuffer
 106         cMB2WC(const char *in, size_t inLen, size_t *outLen) const;
 107     const wxCharBuffer
 108         cWC2MB(const wchar_t *in, size_t inLen, size_t *outLen) const;
 109
 110     // convenience functions for converting MB or WC to/from wxWin default
 111 #if wxUSE_UNICODE
 112     const wxWCharBuffer cMB2WX(const char *psz) const { return cMB2WC(psz); }
 113     const wxCharBuffer cWX2MB(const wchar_t *psz) const { return cWC2MB(psz); }
 114     const wchar_t* cWC2WX(const wchar_t *psz) const { return psz; }
 115     const wchar_t* cWX2WC(const wchar_t *psz) const { return psz; }
 116 #else // ANSI
 117     const char* cMB2WX(const char *psz) const { return psz; }
 118     const char* cWX2MB(const char *psz) const { return psz; }
 119     const wxCharBuffer cWC2WX(const wchar_t *psz) const { return cWC2MB(psz); }
 120     const wxWCharBuffer cWX2WC(const char *psz) const { return cMB2WC(psz); }
 121 #endif // Unicode/ANSI
 122
 123     // this function is used in the implementation of cMB2WC() to distinguish
 124     // between the following cases:
 125     //
 126     //      a) var width encoding with strings terminated by a single NUL
 127     //         (usual multibyte encodings): return 1 in this case
 128     //      b) fixed width encoding with 2 bytes/char and so terminated by
 129     //         2 NULs (UTF-16/UCS-2 and variants): return 2 in this case
 130     //      c) fixed width encoding with 4 bytes/char and so terminated by
 131     //         4 NULs (UTF-32/UCS-4 and variants): return 4 in this case
 132     //
 133     // anything else is not supported currently and -1 should be returned
 134     virtual size_t GetMBNulLen() const { return 1; }
 135
 136     // return the maximal value currently returned by GetMBNulLen() for any
 137     // encoding
 138     static size_t GetMaxMBNulLen() { return 4 /* for UTF-32 */; }
 139
 140 #if wxUSE_UNICODE_UTF8
 141     // return true if the converter's charset is UTF-8, i.e. char* strings
 142     // decoded using this object can be directly copied to wxString's internal
 143     // storage without converting to WC and than back to UTF-8 MB string
 144     virtual bool IsUTF8() const { return false; }
 145 #endif
 146
 147     // The old conversion functions. The existing classes currently mostly
 148     // implement these ones but we're in transition to using To/FromWChar()
 149     // instead and any new classes should implement just the new functions.
 150     // For now, however, we provide default implementation of To/FromWChar() in
 151     // this base class in terms of MB2WC/WC2MB() to avoid having to rewrite all
 152     // the conversions at once.
 153     //
 154     // On success, the return value is the length (i.e. the number of
 155     // characters, not bytes) not counting the trailing NUL(s) of the converted
 156     // string. On failure, (size_t)-1 is returned. In the special case when
 157     // outputBuf is NULL the return value is the same one but nothing is
 158     // written to the buffer.
 159     //
 160     // Note that outLen is the length of the output buffer, not the length of
 161     // the input (which is always supposed to be terminated by one or more
 162     // NULs, as appropriate for the encoding)!
 163     virtual size_t MB2WC(wchar_t *out, const char *in, size_t outLen) const;
 164     virtual size_t WC2MB(char *out, const wchar_t *in, size_t outLen) const;
 165
 166
 167     // make a heap-allocated copy of this object
 168     virtual wxMBConv *Clone() const = 0;
 169
 170     // virtual dtor for any base class
 171     virtual ~wxMBConv();
 172 };
 173
 174 // ----------------------------------------------------------------------------
 175 // wxMBConvLibc uses standard mbstowcs() and wcstombs() functions for
 176 //              conversion (hence it depends on the current locale)
 177 // ----------------------------------------------------------------------------
 178
 179 class WXDLLIMPEXP_BASE wxMBConvLibc : public wxMBConv
 180 {
 181 public:
 182     virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
 183     virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
 184
 185     virtual wxMBConv *Clone() const { return new wxMBConvLibc; }
 186
 187 #if wxUSE_UNICODE_UTF8
 188     virtual bool IsUTF8() const { return wxLocaleIsUtf8; }
 189 #endif
 190 };
 191
 192 #ifdef __UNIX__
 193
 194 // ----------------------------------------------------------------------------
 195 // wxConvBrokenFileNames is made for Unix in Unicode mode when
 196 // files are accidentally written in an encoding which is not
 197 // the system encoding. Typically, the system encoding will be
 198 // UTF8 but there might be files stored in ISO8859-1 on disk.
 199 // ----------------------------------------------------------------------------
 200
 201 class WXDLLIMPEXP_BASE wxConvBrokenFileNames : public wxMBConv
 202 {
 203 public:
 204     wxConvBrokenFileNames(const wxString& charset);
 205     wxConvBrokenFileNames(const wxConvBrokenFileNames& conv)
 206         : wxMBConv(),
 207           m_conv(conv.m_conv ? conv.m_conv->Clone() : NULL)
 208     {
 209     }
 210     virtual ~wxConvBrokenFileNames() { delete m_conv; }
 211
 212     virtual size_t MB2WC(wchar_t *out, const char *in, size_t outLen) const
 213     {
 214         return m_conv->MB2WC(out, in, outLen);
 215     }
 216
 217     virtual size_t WC2MB(char *out, const wchar_t *in, size_t outLen) const
 218     {
 219         return m_conv->WC2MB(out, in, outLen);
 220     }
 221
 222     virtual size_t GetMBNulLen() const
 223     {
 224         // cast needed to call a private function
 225         return m_conv->GetMBNulLen();
 226     }
 227
 228 #if wxUSE_UNICODE_UTF8
 229     virtual bool IsUTF8() const { return m_conv->IsUTF8(); }
 230 #endif
 231
 232     virtual wxMBConv *Clone() const { return new wxConvBrokenFileNames(*this); }
 233
 234 private:
 235     // the conversion object we forward to
 236     wxMBConv *m_conv;
 237
 238     DECLARE_NO_ASSIGN_CLASS(wxConvBrokenFileNames)
 239 };
 240
 241 #endif // __UNIX__
 242
 243 // ----------------------------------------------------------------------------
 244 // wxMBConvUTF7 (for conversion using UTF7 encoding)
 245 // ----------------------------------------------------------------------------
 246
 247 class WXDLLIMPEXP_BASE wxMBConvUTF7 : public wxMBConv
 248 {
 249 public:
 250     virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
 251     virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
 252
 253     virtual wxMBConv *Clone() const { return new wxMBConvUTF7; }
 254 };
 255
 256 // ----------------------------------------------------------------------------
 257 // wxMBConvUTF8 (for conversion using UTF8 encoding)
 258 // ----------------------------------------------------------------------------
 259
 260 class WXDLLIMPEXP_BASE wxMBConvUTF8 : public wxMBConv
 261 {
 262 public:
 263     // FIXME-UTF8: split this class into multiple classes, one strict and
 264     //             other lossy (PUA, OCTAL mappings)
 265     enum
 266     {
 267         MAP_INVALID_UTF8_NOT = 0,
 268         MAP_INVALID_UTF8_TO_PUA = 1,
 269         MAP_INVALID_UTF8_TO_OCTAL = 2
 270     };
 271
 272     wxMBConvUTF8(int options = MAP_INVALID_UTF8_NOT) : m_options(options) { }
 273     virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
 274     virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
 275
 276     virtual wxMBConv *Clone() const { return new wxMBConvUTF8(m_options); }
 277
 278 #if wxUSE_UNICODE_UTF8
 279     // NB: other mapping modes are not, strictly speaking, UTF-8, so we can't
 280     //     take the shortcut in that case
 281     virtual bool IsUTF8() const { return m_options == MAP_INVALID_UTF8_NOT; }
 282 #endif
 283
 284 private:
 285     int m_options;
 286 };
 287
 288 // ----------------------------------------------------------------------------
 289 // wxMBConvUTF16Base: for both LE and BE variants
 290 // ----------------------------------------------------------------------------
 291
 292 class WXDLLIMPEXP_BASE wxMBConvUTF16Base : public wxMBConv
 293 {
 294 public:
 295     enum { BYTES_PER_CHAR = 2 };
 296
 297     virtual size_t GetMBNulLen() const { return BYTES_PER_CHAR; }
 298
 299 protected:
 300     // return the length of the buffer using srcLen if it's not wxNO_LEN and
 301     // computing the length ourselves if it is; also checks that the length is
 302     // even if specified as we need an entire number of UTF-16 characters and
 303     // returns wxNO_LEN which indicates error if it is odd
 304     static size_t GetLength(const char *src, size_t srcLen);
 305 };
 306
 307 // ----------------------------------------------------------------------------
 308 // wxMBConvUTF16LE (for conversion using UTF16 Little Endian encoding)
 309 // ----------------------------------------------------------------------------
 310
 311 class WXDLLIMPEXP_BASE wxMBConvUTF16LE : public wxMBConvUTF16Base
 312 {
 313 public:
 314     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
 315                            const char *src, size_t srcLen = wxNO_LEN) const;
 316     virtual size_t FromWChar(char *dst, size_t dstLen,
 317                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 318     virtual wxMBConv *Clone() const { return new wxMBConvUTF16LE; }
 319 };
 320
 321 // ----------------------------------------------------------------------------
 322 // wxMBConvUTF16BE (for conversion using UTF16 Big Endian encoding)
 323 // ----------------------------------------------------------------------------
 324
 325 class WXDLLIMPEXP_BASE wxMBConvUTF16BE : public wxMBConvUTF16Base
 326 {
 327 public:
 328     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
 329                            const char *src, size_t srcLen = wxNO_LEN) const;
 330     virtual size_t FromWChar(char *dst, size_t dstLen,
 331                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 332     virtual wxMBConv *Clone() const { return new wxMBConvUTF16BE; }
 333 };
 334
 335 // ----------------------------------------------------------------------------
 336 // wxMBConvUTF32Base: base class for both LE and BE variants
 337 // ----------------------------------------------------------------------------
 338
 339 class WXDLLIMPEXP_BASE wxMBConvUTF32Base : public wxMBConv
 340 {
 341 public:
 342     enum { BYTES_PER_CHAR = 4 };
 343
 344     virtual size_t GetMBNulLen() const { return BYTES_PER_CHAR; }
 345
 346 protected:
 347     // this is similar to wxMBConvUTF16Base method with the same name except
 348     // that, of course, it verifies that length is divisible by 4 if given and
 349     // not by 2
 350     static size_t GetLength(const char *src, size_t srcLen);
 351 };
 352
 353 // ----------------------------------------------------------------------------
 354 // wxMBConvUTF32LE (for conversion using UTF32 Little Endian encoding)
 355 // ----------------------------------------------------------------------------
 356
 357 class WXDLLIMPEXP_BASE wxMBConvUTF32LE : public wxMBConvUTF32Base
 358 {
 359 public:
 360     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
 361                            const char *src, size_t srcLen = wxNO_LEN) const;
 362     virtual size_t FromWChar(char *dst, size_t dstLen,
 363                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 364     virtual wxMBConv *Clone() const { return new wxMBConvUTF32LE; }
 365 };
 366
 367 // ----------------------------------------------------------------------------
 368 // wxMBConvUTF32BE (for conversion using UTF32 Big Endian encoding)
 369 // ----------------------------------------------------------------------------
 370
 371 class WXDLLIMPEXP_BASE wxMBConvUTF32BE : public wxMBConvUTF32Base
 372 {
 373 public:
 374     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
 375                            const char *src, size_t srcLen = wxNO_LEN) const;
 376     virtual size_t FromWChar(char *dst, size_t dstLen,
 377                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 378     virtual wxMBConv *Clone() const { return new wxMBConvUTF32BE; }
 379 };
 380
 381 // ----------------------------------------------------------------------------
 382 // wxCSConv (for conversion based on loadable char sets)
 383 // ----------------------------------------------------------------------------
 384
 385 #include "wx/fontenc.h"
 386
 387 class WXDLLIMPEXP_BASE wxCSConv : public wxMBConv
 388 {
 389 public:
 390     // we can be created either from charset name or from an encoding constant
 391     // but we can't have both at once
 392     wxCSConv(const wxString& charset);
 393     wxCSConv(wxFontEncoding encoding);
 394
 395     wxCSConv(const wxCSConv& conv);
 396     virtual ~wxCSConv();
 397
 398     wxCSConv& operator=(const wxCSConv& conv);
 399
 400     virtual size_t ToWChar(wchar_t *dst, size_t dstLen,
 401                            const char *src, size_t srcLen = wxNO_LEN) const;
 402     virtual size_t FromWChar(char *dst, size_t dstLen,
 403                              const wchar_t *src, size_t srcLen = wxNO_LEN) const;
 404     virtual size_t MB2WC(wchar_t *outputBuf, const char *psz, size_t outputSize) const;
 405     virtual size_t WC2MB(char *outputBuf, const wchar_t *psz, size_t outputSize) const;
 406     virtual size_t GetMBNulLen() const;
 407
 408 #if wxUSE_UNICODE_UTF8
 409     virtual bool IsUTF8() const;
 410 #endif
 411
 412     virtual wxMBConv *Clone() const { return new wxCSConv(*this); }
 413
 414     void Clear();
 415
 416     // return true if the conversion could be initilized successfully
 417     bool IsOk() const;
 418
 419 private:
 420     // common part of all ctors
 421     void Init();
 422
 423     // creates m_convReal if necessary
 424     void CreateConvIfNeeded() const;
 425
 426     // do create m_convReal (unconditionally)
 427     wxMBConv *DoCreate() const;
 428
 429     // set the name (may be only called when m_name == NULL), makes copy of
 430     // charset string
 431     void SetName(const char *charset);
 432
 433
 434     // note that we can't use wxString here because of compilation
 435     // dependencies: we're included from wx/string.h
 436     char *m_name;
 437     wxFontEncoding m_encoding;
 438
 439     // use CreateConvIfNeeded() before accessing m_convReal!
 440     wxMBConv *m_convReal;
 441     bool m_deferred;
 442 };
 443
 444
 445 // ----------------------------------------------------------------------------
 446 // declare predefined conversion objects
 447 // ----------------------------------------------------------------------------
 448
 449 // Note: this macro is an implementation detail (see the comment in
 450 // strconv.cpp). The wxGet_XXX() and wxGet_XXXPtr() functions shouldn't be
 451 // used by user code and neither should XXXPtr, use the wxConvXXX macro
 452 // instead.
 453 #define WX_DECLARE_GLOBAL_CONV(klass, name)                             \
 454     extern WXDLLIMPEXP_DATA_BASE(klass*) name##Ptr;                     \
 455     extern WXDLLIMPEXP_BASE klass* wxGet_##name##Ptr();                 \
 456     inline klass& wxGet_##name()                                        \
 457     {                                                                   \
 458         if ( !name##Ptr )                                               \
 459             name##Ptr = wxGet_##name##Ptr();                            \
 460         return *name##Ptr;                                              \
 461     }
 462
 463
 464 // conversion to be used with all standard functions affected by locale, e.g.
 465 // strtol(), strftime(), ...
 466 WX_DECLARE_GLOBAL_CONV(wxMBConv, wxConvLibc)
 467 #define wxConvLibc wxGet_wxConvLibc()
 468
 469 // conversion ISO-8859-1/UTF-7/UTF-8 <-> wchar_t
 470 WX_DECLARE_GLOBAL_CONV(wxCSConv, wxConvISO8859_1)
 471 #define wxConvISO8859_1 wxGet_wxConvISO8859_1()
 472
 473 WX_DECLARE_GLOBAL_CONV(wxMBConvUTF8, wxConvUTF8)
 474 #define wxConvUTF8 wxGet_wxConvUTF8()
 475
 476 WX_DECLARE_GLOBAL_CONV(wxMBConvUTF7, wxConvUTF7)
 477 #define wxConvUTF7 wxGet_wxConvUTF7()
 478
 479 // conversion used for the file names on the systems where they're not Unicode
 480 // (basically anything except Windows)
 481 //
 482 // this is used by all file functions, can be changed by the application
 483 //
 484 // by default UTF-8 under Mac OS X and wxConvLibc elsewhere (but it's not used
 485 // under Windows normally)
 486 extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvFileName;
 487
 488 // backwards compatible define
 489 #define wxConvFile (*wxConvFileName)
 490
 491 // the current conversion object, may be set to any conversion, is used by
 492 // default in a couple of places inside wx (initially same as wxConvLibc)
 493 extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvCurrent;
 494
 495 // the conversion corresponding to the current locale
 496 WX_DECLARE_GLOBAL_CONV(wxCSConv, wxConvLocal)
 497 #define wxConvLocal wxGet_wxConvLocal()
 498
 499 // the conversion corresponding to the encoding of the standard UI elements
 500 //
 501 // by default this is the same as wxConvLocal but may be changed if the program
 502 // needs to use a fixed encoding
 503 extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvUI;
 504
 505 #undef WX_DECLARE_GLOBAL_CONV
 506
 507 // ----------------------------------------------------------------------------
 508 // endianness-dependent conversions
 509 // ----------------------------------------------------------------------------
 510
 511 #ifdef WORDS_BIGENDIAN
 512     typedef wxMBConvUTF16BE wxMBConvUTF16;
 513     typedef wxMBConvUTF32BE wxMBConvUTF32;
 514 #else
 515     typedef wxMBConvUTF16LE wxMBConvUTF16;
 516     typedef wxMBConvUTF32LE wxMBConvUTF32;
 517 #endif
 518
 519 // ----------------------------------------------------------------------------
 520 // filename conversion macros
 521 // ----------------------------------------------------------------------------
 522
 523 // filenames are multibyte on Unix and widechar on Windows
 524 #if wxMBFILES && wxUSE_UNICODE
 525     #define wxFNCONV(name) wxConvFileName->cWX2MB(name)
 526     #define wxFNSTRINGCAST wxMBSTRINGCAST
 527 #else
 528 #if defined( __WXOSX__ ) && wxMBFILES
 529     #define wxFNCONV(name) wxConvFileName->cWC2MB( wxConvLocal.cWX2WC(name) )
 530 #else
 531     #define wxFNCONV(name) name
 532 #endif
 533     #define wxFNSTRINGCAST WXSTRINGCAST
 534 #endif
 535
 536 #else // !wxUSE_WCHAR_T
 537
 538 // ----------------------------------------------------------------------------
 539 // stand-ins in absence of wchar_t
 540 // ----------------------------------------------------------------------------
 541
 542 class WXDLLIMPEXP_BASE wxMBConv
 543 {
 544 public:
 545     const char* cMB2WX(const char *psz) const { return psz; }
 546     const char* cWX2MB(const char *psz) const { return psz; }
 547 };
 548
 549 #define wxConvFile wxConvLocal
 550
 551 extern WXDLLIMPEXP_DATA_BASE(wxMBConv) wxConvLibc,
 552                                        wxConvLocal,
 553                                        wxConvISO8859_1,
 554                                        wxConvUTF8;
 555 extern WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvCurrent;
 556
 557 #define wxFNCONV(name) name
 558 #define wxFNSTRINGCAST WXSTRINGCAST
 559
 560 #endif
 561   // wxUSE_WCHAR_T
 562
 563 // ----------------------------------------------------------------------------
 564 // macros for the most common conversions
 565 // ----------------------------------------------------------------------------
 566
 567 #if wxUSE_UNICODE
 568     #define wxConvertWX2MB(s)   wxConvCurrent->cWX2MB(s)
 569     #define wxConvertMB2WX(s)   wxConvCurrent->cMB2WX(s)
 570
 571     // these functions should be used when the conversions really, really have
 572     // to succeed (usually because we pass their results to a standard C
 573     // function which would crash if we passed NULL to it), so these functions
 574     // always return a valid pointer if their argument is non-NULL
 575
 576     // this function safety is achieved by trying wxConvLibc first, wxConvUTF8
 577     // next if it fails and, finally, wxConvISO8859_1 which always succeeds
 578     extern WXDLLIMPEXP_BASE wxWCharBuffer wxSafeConvertMB2WX(const char *s);
 579
 580     // this function uses wxConvLibc and wxConvUTF8(MAP_INVALID_UTF8_TO_OCTAL)
 581     // if it fails
 582     extern WXDLLIMPEXP_BASE wxCharBuffer wxSafeConvertWX2MB(const wchar_t *ws);
 583 #else // ANSI
 584     // no conversions to do
 585     #define wxConvertWX2MB(s)   (s)
 586     #define wxConvertMB2WX(s)   (s)
 587     #define wxSafeConvertMB2WX(s) (s)
 588     #define wxSafeConvertWX2MB(s) (s)
 589 #endif // Unicode/ANSI
 590
 591 #endif // _WX_STRCONV_H_
 592