src/common/strconv.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        strconv.cpp
   3 // Purpose:     Unicode conversion classes
   4 // Author:      Ove Kaaven, Robert Roebling, Vadim Zeitlin, Vaclav Slavik
   5 // Modified by:
   6 // Created:     29/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 1999 Ove Kaaven, Robert Roebling, Vadim Zeitlin, Vaclav Slavik
   9 // Licence:     wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 #ifdef __GNUG__
  21   #pragma implementation "strconv.h"
  22 #endif
  23
  24 // For compilers that support precompilation, includes "wx.h".
  25 #include "wx/wxprec.h"
  26
  27 #ifdef __BORLANDC__
  28   #pragma hdrstop
  29 #endif
  30
  31 #ifndef WX_PRECOMP
  32     #include "wx/intl.h"
  33     #include "wx/log.h"
  34 #endif // WX_PRECOMP
  35
  36 #ifdef __WXMSW__
  37     #include "wx/msw/private.h"
  38 #endif
  39
  40 #include <errno.h>
  41 #include <ctype.h>
  42 #include <string.h>
  43 #include <stdlib.h>
  44
  45 #include "wx/module.h"
  46 #include "wx/strconv.h"
  47
  48 // ----------------------------------------------------------------------------
  49 // globals
  50 // ----------------------------------------------------------------------------
  51
  52 #if wxUSE_WCHAR_T
  53     WXDLLEXPORT_DATA(wxMBConv) wxConvLibc;
  54     WXDLLEXPORT_DATA(wxCSConv) wxConvLocal((const wxChar *)NULL);
  55 #else
  56     // stand-ins in absence of wchar_t
  57     WXDLLEXPORT_DATA(wxMBConv) wxConvLibc, wxConvFile;
  58 #endif // wxUSE_WCHAR_T
  59
  60 WXDLLEXPORT_DATA(wxMBConv *) wxConvCurrent = &wxConvLibc;
  61
  62 class wxStrConvModule: public wxModule
  63 {
  64 public:
  65     wxStrConvModule() : wxModule() { }
  66     virtual bool OnInit() { return TRUE; }
  67     virtual void OnExit()
  68     {
  69 #if wxUSE_WCHAR_T
  70         wxConvLocal.Clear();
  71 #endif
  72     }
  73
  74     DECLARE_DYNAMIC_CLASS(wxStrConvModule)
  75 };
  76
  77 IMPLEMENT_DYNAMIC_CLASS(wxStrConvModule, wxModule)
  78
  79
  80 // ----------------------------------------------------------------------------
  81 // headers
  82 // ----------------------------------------------------------------------------
  83
  84 #if wxUSE_WCHAR_T
  85
  86 #ifdef __SALFORDC__
  87     #include <clib.h>
  88 #endif
  89
  90 #ifdef HAVE_ICONV
  91     #include <iconv.h>
  92 #endif
  93
  94 #include "wx/encconv.h"
  95 #include "wx/fontmap.h"
  96
  97 // ----------------------------------------------------------------------------
  98 // macros
  99 // ----------------------------------------------------------------------------
 100
 101 #define BSWAP_UCS4(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT32_SWAP_ALWAYS(str[_c]); }
 102 #define BSWAP_UTF16(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT16_SWAP_ALWAYS(str[_c]); }
 103
 104 // under Unix SIZEOF_WCHAR_T is defined by configure, but under other platforms
 105 // it might be not defined - assume the most common value
 106 #ifndef SIZEOF_WCHAR_T
 107     #define SIZEOF_WCHAR_T 2
 108 #endif // !defined(SIZEOF_WCHAR_T)
 109
 110 #if SIZEOF_WCHAR_T == 4
 111     #define WC_NAME         "UCS4"
 112     #define WC_BSWAP         BSWAP_UCS4
 113     #ifdef WORDS_BIGENDIAN
 114       #define WC_NAME_BEST  "UCS-4BE"
 115     #else
 116       #define WC_NAME_BEST  "UCS-4LE"
 117     #endif
 118 #elif SIZEOF_WCHAR_T == 2
 119     #define WC_NAME         "UTF16"
 120     #define WC_BSWAP         BSWAP_UTF16
 121     #define WC_UTF16
 122     #ifdef WORDS_BIGENDIAN
 123       #define WC_NAME_BEST  "UTF-16BE"
 124     #else
 125       #define WC_NAME_BEST  "UTF-16LE"
 126     #endif
 127 #else // sizeof(wchar_t) != 2 nor 4
 128     // I don't know what to do about this
 129     #error "Weird sizeof(wchar_t): please report your platform details to wx-users mailing list"
 130 #endif
 131
 132 // ============================================================================
 133 // implementation
 134 // ============================================================================
 135
 136 // ----------------------------------------------------------------------------
 137 // UTF-16 en/decoding
 138 // ----------------------------------------------------------------------------
 139
 140 #ifdef WC_UTF16
 141
 142 static size_t encode_utf16(wxUint32 input, wchar_t *output)
 143 {
 144     if (input<=0xffff)
 145     {
 146         if (output) *output++ = (wchar_t) input;
 147         return 1;
 148     }
 149     else if (input>=0x110000)
 150     {
 151         return (size_t)-1;
 152     }
 153     else
 154     {
 155         if (output)
 156         {
 157             *output++ = (wchar_t) ((input >> 10)+0xd7c0);
 158             *output++ = (wchar_t) ((input&0x3ff)+0xdc00);
 159         }
 160         return 2;
 161     }
 162 }
 163
 164 static size_t decode_utf16(const wchar_t* input, wxUint32& output)
 165 {
 166     if ((*input<0xd800) || (*input>0xdfff))
 167     {
 168         output = *input;
 169         return 1;
 170     }
 171     else if ((input[1]<0xdc00) || (input[1]>=0xdfff))
 172     {
 173         output = *input;
 174         return (size_t)-1;
 175     }
 176     else
 177     {
 178         output = ((input[0] - 0xd7c0) << 10) + (input[1] - 0xdc00);
 179         return 2;
 180     }
 181 }
 182
 183 #endif // WC_UTF16
 184
 185 // ----------------------------------------------------------------------------
 186 // wxMBConv
 187 // ----------------------------------------------------------------------------
 188
 189 size_t wxMBConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 190 {
 191     return wxMB2WC(buf, psz, n);
 192 }
 193
 194 size_t wxMBConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 195 {
 196     return wxWC2MB(buf, psz, n);
 197 }
 198
 199 const wxWCharBuffer wxMBConv::cMB2WC(const char *psz) const
 200 {
 201     if (psz)
 202     {
 203         size_t nLen = MB2WC((wchar_t *) NULL, psz, 0);
 204         if (nLen == (size_t)-1)
 205             return wxWCharBuffer((wchar_t *) NULL);
 206         wxWCharBuffer buf(nLen);
 207         MB2WC((wchar_t *)(const wchar_t *) buf, psz, nLen);
 208         return buf;
 209     }
 210     else
 211         return wxWCharBuffer((wchar_t *) NULL);
 212 }
 213
 214 const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *psz) const
 215 {
 216     if (psz)
 217     {
 218         size_t nLen = WC2MB((char *) NULL, psz, 0);
 219         if (nLen == (size_t)-1)
 220             return wxCharBuffer((char *) NULL);
 221         wxCharBuffer buf(nLen);
 222         WC2MB((char *)(const char *) buf, psz, nLen);
 223         return buf;
 224     }
 225     else
 226         return wxCharBuffer((char *) NULL);
 227 }
 228
 229 // ----------------------------------------------------------------------------
 230 // standard file conversion
 231 // ----------------------------------------------------------------------------
 232
 233 WXDLLEXPORT_DATA(wxMBConvFile) wxConvFile;
 234
 235 // just use the libc conversion for now
 236 size_t wxMBConvFile::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 237 {
 238     return wxMB2WC(buf, psz, n);
 239 }
 240
 241 size_t wxMBConvFile::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 242 {
 243     return wxWC2MB(buf, psz, n);
 244 }
 245
 246 // ----------------------------------------------------------------------------
 247 // standard gdk conversion
 248 // ----------------------------------------------------------------------------
 249
 250 #ifdef __WXGTK12__
 251
 252 WXDLLEXPORT_DATA(wxMBConvGdk) wxConvGdk;
 253
 254 #include <gdk/gdk.h>
 255
 256 size_t wxMBConvGdk::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 257 {
 258     if (buf)
 259     {
 260         return gdk_mbstowcs((GdkWChar *)buf, psz, n);
 261     }
 262     else
 263     {
 264         GdkWChar *nbuf = new GdkWChar[n=strlen(psz)];
 265         size_t len = gdk_mbstowcs(nbuf, psz, n);
 266         delete[] nbuf;
 267         return len;
 268     }
 269 }
 270
 271 size_t wxMBConvGdk::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 272 {
 273     char *mbstr = gdk_wcstombs((GdkWChar *)psz);
 274     size_t len = mbstr ? strlen(mbstr) : 0;
 275     if (buf)
 276     {
 277         if (len > n)
 278             len = n;
 279         memcpy(buf, psz, len);
 280         if (len < n)
 281             buf[len] = 0;
 282     }
 283     return len;
 284 }
 285
 286 #endif // GTK > 1.0
 287
 288 // ----------------------------------------------------------------------------
 289 // UTF-7
 290 // ----------------------------------------------------------------------------
 291
 292 WXDLLEXPORT_DATA(wxMBConvUTF7) wxConvUTF7;
 293
 294 #if 0
 295 static char utf7_setD[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 296                         "abcdefghijklmnopqrstuvwxyz"
 297                         "0123456789'(),-./:?";
 298 static char utf7_setO[]="!\"#$%&*;<=>@[]^_`{|}";
 299 static char utf7_setB[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 300                         "abcdefghijklmnopqrstuvwxyz"
 301                         "0123456789+/";
 302 #endif
 303
 304 // TODO: write actual implementations of UTF-7 here
 305 size_t wxMBConvUTF7::MB2WC(wchar_t * WXUNUSED(buf),
 306                            const char * WXUNUSED(psz),
 307                            size_t WXUNUSED(n)) const
 308 {
 309   return 0;
 310 }
 311
 312 size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
 313                            const wchar_t * WXUNUSED(psz),
 314                            size_t WXUNUSED(n)) const
 315 {
 316   return 0;
 317 }
 318
 319 // ----------------------------------------------------------------------------
 320 // UTF-8
 321 // ----------------------------------------------------------------------------
 322
 323 WXDLLEXPORT_DATA(wxMBConvUTF8) wxConvUTF8;
 324
 325 static wxUint32 utf8_max[]=
 326     { 0x7f, 0x7ff, 0xffff, 0x1fffff, 0x3ffffff, 0x7fffffff, 0xffffffff };
 327
 328 size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 329 {
 330     size_t len = 0;
 331
 332     while (*psz && ((!buf) || (len < n)))
 333     {
 334         unsigned char cc = *psz++, fc = cc;
 335         unsigned cnt;
 336         for (cnt = 0; fc & 0x80; cnt++)
 337             fc <<= 1;
 338         if (!cnt)
 339         {
 340             // plain ASCII char
 341             if (buf)
 342                 *buf++ = cc;
 343             len++;
 344         }
 345         else
 346         {
 347             cnt--;
 348             if (!cnt)
 349             {
 350                 // invalid UTF-8 sequence
 351                 return (size_t)-1;
 352             }
 353             else
 354             {
 355                 unsigned ocnt = cnt - 1;
 356                 wxUint32 res = cc & (0x3f >> cnt);
 357                 while (cnt--)
 358                 {
 359                     cc = *psz++;
 360                     if ((cc & 0xC0) != 0x80)
 361                     {
 362                         // invalid UTF-8 sequence
 363                         return (size_t)-1;
 364                     }
 365                     res = (res << 6) | (cc & 0x3f);
 366                 }
 367                 if (res <= utf8_max[ocnt])
 368                 {
 369                     // illegal UTF-8 encoding
 370                     return (size_t)-1;
 371                 }
 372 #ifdef WC_UTF16
 373                 size_t pa = encode_utf16(res, buf);
 374                 if (pa == (size_t)-1)
 375                   return (size_t)-1;
 376                 if (buf)
 377                     buf += pa;
 378                 len += pa;
 379 #else // !WC_UTF16
 380                 if (buf)
 381                     *buf++ = res;
 382                 len++;
 383 #endif // WC_UTF16/!WC_UTF16
 384             }
 385         }
 386     }
 387     if (buf && (len < n))
 388         *buf = 0;
 389     return len;
 390 }
 391
 392 size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 393 {
 394     size_t len = 0;
 395
 396     while (*psz && ((!buf) || (len < n)))
 397     {
 398         wxUint32 cc;
 399 #ifdef WC_UTF16
 400         size_t pa = decode_utf16(psz, cc);
 401         psz += (pa == (size_t)-1) ? 1 : pa;
 402 #else
 403         cc=(*psz++) & 0x7fffffff;
 404 #endif
 405         unsigned cnt;
 406         for (cnt = 0; cc > utf8_max[cnt]; cnt++) {}
 407         if (!cnt)
 408         {
 409             // plain ASCII char
 410             if (buf)
 411                 *buf++ = (char) cc;
 412             len++;
 413         }
 414
 415         else
 416         {
 417             len += cnt + 1;
 418             if (buf)
 419             {
 420                 *buf++ = (char) ((-128 >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt)));
 421                 while (cnt--)
 422                     *buf++ = (char) (0x80 | ((cc >> (cnt * 6)) & 0x3f));
 423             }
 424         }
 425     }
 426
 427     if (buf && (len<n)) *buf = 0;
 428     return len;
 429 }
 430
 431 // ============================================================================
 432 // wxCharacterSet and derived classes
 433 // ============================================================================
 434
 435 // ----------------------------------------------------------------------------
 436 // wxCharacterSet is the ABC for the classes below
 437 // ----------------------------------------------------------------------------
 438
 439 class wxCharacterSet
 440 {
 441 public:
 442     wxCharacterSet(const wxChar*name) : cname(name) {}
 443     virtual ~wxCharacterSet() {}
 444     virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) = 0;
 445     virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) = 0;
 446     virtual bool usable() const = 0;
 447 public:
 448     const wxChar*cname;
 449 };
 450
 451 // ----------------------------------------------------------------------------
 452 // ID_CharSet: implementation of wxCharacterSet using an existing wxMBConv
 453 // ----------------------------------------------------------------------------
 454
 455 class ID_CharSet : public wxCharacterSet
 456 {
 457 public:
 458     ID_CharSet(const wxChar *name, wxMBConv *cnv)
 459         : wxCharacterSet(name), work(cnv) {}
 460
 461     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
 462         { return work ? work->MB2WC(buf,psz,n) : (size_t)-1; }
 463
 464     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
 465         { return work ? work->WC2MB(buf,psz,n) : (size_t)-1; }
 466
 467     bool usable() const
 468         { return work!=NULL; }
 469 public:
 470     wxMBConv*work;
 471 };
 472
 473
 474 // ============================================================================
 475 // The classes doing conversion using the iconv_xxx() functions
 476 // ============================================================================
 477
 478 #ifdef HAVE_ICONV
 479
 480 // VS: glibc 2.1.3 is broken in that iconv() conversion to/from UCS4 fails with E2BIG
 481 //     if output buffer is _exactly_ as big as needed. Such case is (unless there's
 482 //     yet another bug in glibc) the only case when iconv() returns with (size_t)-1
 483 //     (which means error) and says there are 0 bytes left in the input buffer --
 484 //     when _real_ error occurs, bytes-left-in-input buffer is non-zero. Hence,
 485 //     this alternative test for iconv() failure.
 486 //     [This bug does not appear in glibc 2.2.]
 487 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ <= 1
 488 #define ICONV_FAILED(cres, bufLeft) ((cres == (size_t)-1) && \
 489                                      (errno != E2BIG || bufLeft != 0))
 490 #else
 491 #define ICONV_FAILED(cres, bufLeft)  (cres == (size_t)-1)
 492 #endif
 493
 494 #define ICONV_CHAR_CAST(x)  ((ICONV_CONST char **)(x))
 495
 496 // ----------------------------------------------------------------------------
 497 // IC_CharSet: encapsulates an iconv character set
 498 // ----------------------------------------------------------------------------
 499
 500 class IC_CharSet : public wxCharacterSet
 501 {
 502 public:
 503     IC_CharSet(const wxChar *name);
 504     virtual ~IC_CharSet();
 505
 506     virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n);
 507     virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n);
 508
 509     bool usable() const
 510         { return (m2w != (iconv_t)-1) && (w2m != (iconv_t)-1); }
 511
 512 protected:
 513     // the iconv handlers used to translate from multibyte to wide char and in
 514     // the other direction
 515     iconv_t m2w,
 516             w2m;
 517
 518 private:
 519     // the name (for iconv_open()) of a wide char charset - if none is
 520     // available on this machine, it will remain NULL
 521     static const char *ms_wcCharsetName;
 522
 523     // true if the wide char encoding we use (i.e. ms_wcCharsetName) has
 524     // different endian-ness than the native one
 525     static bool ms_wcNeedsSwap;
 526 };
 527
 528 const char *IC_CharSet::ms_wcCharsetName = NULL;
 529 bool IC_CharSet::ms_wcNeedsSwap = FALSE;
 530
 531 IC_CharSet::IC_CharSet(const wxChar *name)
 532           : wxCharacterSet(name)
 533 {
 534     // check for charset that represents wchar_t:
 535     if (ms_wcCharsetName == NULL)
 536     {
 537         ms_wcNeedsSwap = FALSE;
 538
 539         // try charset with explicit bytesex info (e.g. "UCS-4LE"):
 540         ms_wcCharsetName = WC_NAME_BEST;
 541         m2w = iconv_open(ms_wcCharsetName, wxConvLibc.cWX2MB(name));
 542
 543         if (m2w == (iconv_t)-1)
 544         {
 545             // try charset w/o bytesex info (e.g. "UCS4")
 546             // and check for bytesex ourselves:
 547             ms_wcCharsetName = WC_NAME;
 548             m2w = iconv_open(ms_wcCharsetName, wxConvLibc.cWX2MB(name));
 549
 550             // last bet, try if it knows WCHAR_T pseudo-charset
 551             if (m2w == (iconv_t)-1)
 552             {
 553                 ms_wcCharsetName = "WCHAR_T";
 554                 m2w = iconv_open(ms_wcCharsetName, wxConvLibc.cWX2MB(name));
 555             }
 556
 557             if (m2w != (iconv_t)-1)
 558             {
 559                 char    buf[2], *bufPtr;
 560                 wchar_t wbuf[2], *wbufPtr;
 561                 size_t  insz, outsz;
 562                 size_t  res;
 563
 564                 buf[0] = 'A';
 565                 buf[1] = 0;
 566                 wbuf[0] = 0;
 567                 insz = 2;
 568                 outsz = SIZEOF_WCHAR_T * 2;
 569                 wbufPtr = wbuf;
 570                 bufPtr = buf;
 571
 572                 res = iconv(m2w, ICONV_CHAR_CAST(&bufPtr), &insz,
 573                             (char**)&wbufPtr, &outsz);
 574
 575                 if (ICONV_FAILED(res, insz))
 576                 {
 577                     ms_wcCharsetName = NULL;
 578                     wxLogLastError(wxT("iconv"));
 579                     wxLogError(_("Convertion to charset '%s' doesn't work."), name);
 580                 }
 581                 else
 582                 {
 583                     ms_wcNeedsSwap = wbuf[0] != (wchar_t)buf[0];
 584                 }
 585             }
 586             else
 587             {
 588                 ms_wcCharsetName = NULL;
 589
 590                 // VS: we must not output an error here, since wxWindows will safely
 591                 //     fall back to using wxEncodingConverter.
 592                 wxLogTrace(wxT("strconv"), wxT("Impossible to convert to/from charset '%s' with iconv, falling back to wxEncodingConverter."), name);
 593                 //wxLogError(
 594             }
 595         }
 596         wxLogTrace(wxT("strconv"), wxT("wchar_t charset is '%s', needs swap: %i"), ms_wcCharsetName, ms_wcNeedsSwap);
 597     }
 598     else // we already have ms_wcCharsetName
 599     {
 600         m2w = iconv_open(ms_wcCharsetName, wxConvLibc.cWX2MB(name));
 601     }
 602
 603     // NB: don't ever pass NULL to iconv_open(), it may crash!
 604     if ( ms_wcCharsetName )
 605     {
 606         w2m = iconv_open(wxConvLibc.cWX2MB(name), ms_wcCharsetName);
 607     }
 608     else
 609     {
 610         w2m = (iconv_t)-1;
 611     }
 612 }
 613
 614 IC_CharSet::~IC_CharSet()
 615 {
 616     if ( m2w != (iconv_t)-1 )
 617         iconv_close(m2w);
 618     if ( w2m != (iconv_t)-1 )
 619         iconv_close(w2m);
 620 }
 621
 622 size_t IC_CharSet::MB2WC(wchar_t *buf, const char *psz, size_t n)
 623 {
 624     size_t inbuf = strlen(psz);
 625     size_t outbuf = n * SIZEOF_WCHAR_T;
 626     size_t res, cres;
 627     // VS: Use these instead of psz, buf because iconv() modifies its arguments:
 628     wchar_t *bufPtr = buf;
 629     const char *pszPtr = psz;
 630
 631     if (buf)
 632     {
 633         // have destination buffer, convert there
 634         cres = iconv(m2w,
 635                      ICONV_CHAR_CAST(&pszPtr), &inbuf,
 636                      (char**)&bufPtr, &outbuf);
 637         res = n - (outbuf / SIZEOF_WCHAR_T);
 638
 639         if (ms_wcNeedsSwap)
 640         {
 641             // convert to native endianness
 642             WC_BSWAP(buf /* _not_ bufPtr */, res)
 643         }
 644     }
 645     else
 646     {
 647         // no destination buffer... convert using temp buffer
 648         // to calculate destination buffer requirement
 649         wchar_t tbuf[8];
 650         res = 0;
 651         do {
 652             bufPtr = tbuf;
 653             outbuf = 8*SIZEOF_WCHAR_T;
 654
 655             cres = iconv(m2w,
 656                          ICONV_CHAR_CAST(&pszPtr), &inbuf,
 657                          (char**)&bufPtr, &outbuf );
 658
 659             res += 8-(outbuf/SIZEOF_WCHAR_T);
 660         } while ((cres==(size_t)-1) && (errno==E2BIG));
 661     }
 662
 663     if (ICONV_FAILED(cres, inbuf))
 664     {
 665         //VS: it is ok if iconv fails, hence trace only
 666         wxLogTrace(wxT("strconv"), wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
 667         return (size_t)-1;
 668     }
 669
 670     return res;
 671 }
 672
 673 size_t IC_CharSet::WC2MB(char *buf, const wchar_t *psz, size_t n)
 674 {
 675 #if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
 676     size_t inbuf = std::wcslen(psz) * SIZEOF_WCHAR_T;
 677 #else
 678     size_t inbuf = ::wcslen(psz) * SIZEOF_WCHAR_T;
 679 #endif
 680     size_t outbuf = n;
 681     size_t res, cres;
 682
 683     wchar_t *tmpbuf = 0;
 684
 685     if (ms_wcNeedsSwap)
 686     {
 687         // need to copy to temp buffer to switch endianness
 688         // this absolutely doesn't rock!
 689         // (no, doing WC_BSWAP twice on the original buffer won't help, as it
 690         //  could be in read-only memory, or be accessed in some other thread)
 691         tmpbuf=(wchar_t*)malloc((inbuf+1)*SIZEOF_WCHAR_T);
 692         memcpy(tmpbuf,psz,(inbuf+1)*SIZEOF_WCHAR_T);
 693         WC_BSWAP(tmpbuf, inbuf)
 694         psz=tmpbuf;
 695     }
 696
 697     if (buf)
 698     {
 699         // have destination buffer, convert there
 700         cres = iconv( w2m, ICONV_CHAR_CAST(&psz), &inbuf, &buf, &outbuf );
 701
 702         res = n-outbuf;
 703     }
 704     else
 705     {
 706         // no destination buffer... convert using temp buffer
 707         // to calculate destination buffer requirement
 708         char tbuf[16];
 709         res = 0;
 710         do {
 711             buf = tbuf; outbuf = 16;
 712
 713             cres = iconv( w2m, ICONV_CHAR_CAST(&psz), &inbuf, &buf, &outbuf );
 714
 715             res += 16 - outbuf;
 716         } while ((cres==(size_t)-1) && (errno==E2BIG));
 717     }
 718
 719     if (ms_wcNeedsSwap)
 720     {
 721         free(tmpbuf);
 722     }
 723
 724     if (ICONV_FAILED(cres, inbuf))
 725     {
 726         //VS: it is ok if iconv fails, hence trace only
 727         wxLogTrace(wxT("strconv"), wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
 728         return (size_t)-1;
 729     }
 730
 731     return res;
 732 }
 733
 734 #endif // HAVE_ICONV
 735
 736 // ============================================================================
 737 // Win32 conversion classes
 738 // ============================================================================
 739
 740 #if defined(__WIN32__) && !defined(__WXMICROWIN__)
 741
 742 extern long wxCharsetToCodepage(const wxChar *charset); // from utils.cpp
 743
 744 class CP_CharSet : public wxCharacterSet
 745 {
 746 public:
 747     CP_CharSet(const wxChar* name)
 748         : wxCharacterSet(name)
 749         {
 750             m_CodePage = wxCharsetToCodepage(name);
 751         }
 752
 753     size_t MB2WC(wchar_t *buf, const char *psz, size_t n)
 754     {
 755         size_t len =
 756             MultiByteToWideChar(m_CodePage, 0, psz, -1, buf, buf ? n : 0);
 757         //VS: returns # of written chars for buf!=NULL and *size*
 758         //    needed buffer for buf==NULL
 759         return len ? (buf ? len : len-1) : (size_t)-1;
 760     }
 761
 762     size_t WC2MB(char *buf, const wchar_t *psz, size_t n)
 763     {
 764         size_t len = WideCharToMultiByte(m_CodePage, 0, psz, -1, buf,
 765                                          buf ? n : 0, NULL, NULL);
 766         //VS: returns # of written chars for buf!=NULL and *size*
 767         //    needed buffer for buf==NULL
 768         return len ? (buf ? len : len-1) : (size_t)-1;
 769     }
 770
 771     bool usable() const
 772         { return m_CodePage != -1; }
 773
 774 public:
 775     long m_CodePage;
 776 };
 777 #endif // __WIN32__
 778
 779 // ============================================================================
 780 // wxEncodingConverter based conversion classes
 781 // ============================================================================
 782
 783 #if wxUSE_FONTMAP
 784
 785 class EC_CharSet : public wxCharacterSet
 786 {
 787 public:
 788     // temporarily just use wxEncodingConverter stuff,
 789     // so that it works while a better implementation is built
 790     EC_CharSet(const wxChar* name) : wxCharacterSet(name),
 791                                      enc(wxFONTENCODING_SYSTEM)
 792     {
 793         if (name)
 794             enc = wxFontMapper::Get()->CharsetToEncoding(name, FALSE);
 795
 796         m_ok = m2w.Init(enc, wxFONTENCODING_UNICODE) &&
 797                w2m.Init(wxFONTENCODING_UNICODE, enc);
 798     }
 799
 800     size_t MB2WC(wchar_t *buf, const char *psz, size_t WXUNUSED(n))
 801     {
 802         size_t inbuf = strlen(psz);
 803         if (buf)
 804             m2w.Convert(psz,buf);
 805         return inbuf;
 806     }
 807
 808     size_t WC2MB(char *buf, const wchar_t *psz, size_t WXUNUSED(n))
 809     {
 810 #if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \
 811     || ( defined(__MWERKS__) && defined(__WXMSW__) )
 812         size_t inbuf = std::wcslen(psz);
 813 #else
 814         size_t inbuf = ::wcslen(psz);
 815 #endif
 816         if (buf)
 817             w2m.Convert(psz,buf);
 818
 819         return inbuf;
 820     }
 821
 822     bool usable() const { return m_ok; }
 823
 824 public:
 825     wxFontEncoding enc;
 826     wxEncodingConverter m2w, w2m;
 827
 828     // were we initialized successfully?
 829     bool m_ok;
 830 };
 831
 832 #endif // wxUSE_FONTMAP
 833
 834 // ----------------------------------------------------------------------------
 835 // the function creating the wxCharacterSet for the specified charset on the
 836 // current system, trying all possibilities
 837 // ----------------------------------------------------------------------------
 838
 839 static wxCharacterSet *wxGetCharacterSet(const wxChar *name)
 840 {
 841     // check for the special case of ASCII charset
 842 #if wxUSE_FONTMAP
 843     if ( wxFontMapper::Get()->CharsetToEncoding(name) == wxFONTENCODING_DEFAULT )
 844 #else // wxUSE_FONTMAP
 845     if ( !name )
 846 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
 847     {
 848         // don't convert at all
 849         return NULL;
 850     }
 851
 852     // the test above must have taken care of this case
 853     wxCHECK_MSG( name, NULL, _T("NULL name must be wxFONTENCODING_DEFAULT") );
 854
 855     wxCharacterSet *cset;
 856
 857     if ( wxStricmp(name, wxT("UTF8")) == 0 || wxStricmp(name, wxT("UTF-8")) == 0)
 858     {
 859         cset = new ID_CharSet(name, &wxConvUTF8);
 860     }
 861     else
 862     {
 863 #ifdef HAVE_ICONV
 864         cset = new IC_CharSet(name);
 865 #else // !HAVE_ICONV
 866         cset = NULL;
 867 #endif // HAVE_ICONV/!HAVE_ICONV
 868     }
 869
 870     // it can only be NULL in this case
 871 #ifndef HAVE_ICONV
 872     if ( cset )
 873 #endif // !HAVE_ICONV
 874     {
 875         if ( cset->usable() )
 876             return cset;
 877
 878         delete cset;
 879         cset = NULL;
 880     }
 881
 882 #if defined(__WIN32__) && !defined(__WXMICROWIN__)
 883     cset = new CP_CharSet(name);
 884     if ( cset->usable() )
 885         return cset;
 886
 887     delete cset;
 888     cset = NULL;
 889 #endif // __WIN32__
 890
 891 #if wxUSE_FONTMAP
 892     cset = new EC_CharSet(name);
 893     if ( cset->usable() )
 894         return cset;
 895
 896     delete cset;
 897     cset = NULL;
 898 #endif // wxUSE_FONTMAP
 899
 900     wxLogError(_("Cannot convert from encoding '%s'!"), name);
 901
 902     return NULL;
 903 }
 904
 905 // ============================================================================
 906 // wxCSConv implementation
 907 // ============================================================================
 908
 909 wxCSConv::wxCSConv(const wxChar *charset)
 910 {
 911     m_name = (wxChar *)NULL;
 912     m_cset = (wxCharacterSet *) NULL;
 913     m_deferred = TRUE;
 914
 915     SetName(charset);
 916 }
 917
 918 wxCSConv::~wxCSConv()
 919 {
 920     Clear();
 921 }
 922
 923 wxCSConv::wxCSConv(const wxCSConv& conv)
 924     : wxMBConv()
 925 {
 926     Clear();
 927     SetName(conv.m_name);
 928 }
 929
 930 wxCSConv& wxCSConv::operator=(const wxCSConv& conv)
 931 {
 932     Clear();
 933     SetName(conv.m_name);
 934     return *this;
 935 }
 936
 937 void wxCSConv::Clear()
 938 {
 939     if (m_name)
 940         free(m_name);
 941     if (m_cset)
 942         delete m_cset;
 943     m_name = NULL;
 944     m_cset = NULL;
 945 }
 946
 947 void wxCSConv::SetName(const wxChar *charset)
 948 {
 949     if (charset)
 950     {
 951         m_name = wxStrdup(charset);
 952         m_deferred = TRUE;
 953     }
 954 }
 955
 956 void wxCSConv::LoadNow()
 957 {
 958     if (m_deferred)
 959     {
 960         if ( !m_name )
 961         {
 962             wxString name = wxLocale::GetSystemEncodingName();
 963             if ( !name.empty() )
 964                 SetName(name);
 965         }
 966
 967         // wxGetCharacterSet() complains about NULL name
 968         m_cset = m_name ? wxGetCharacterSet(m_name) : NULL;
 969         m_deferred = FALSE;
 970     }
 971 }
 972
 973 size_t wxCSConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 974 {
 975     ((wxCSConv *)this)->LoadNow(); // discard constness
 976
 977     if (m_cset)
 978         return m_cset->MB2WC(buf, psz, n);
 979
 980     // latin-1 (direct)
 981     size_t len = strlen(psz);
 982
 983     if (buf)
 984     {
 985         for (size_t c = 0; c <= len; c++)
 986             buf[c] = (unsigned char)(psz[c]);
 987     }
 988
 989     return len;
 990 }
 991
 992 size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 993 {
 994     ((wxCSConv *)this)->LoadNow(); // discard constness
 995
 996     if (m_cset)
 997         return m_cset->WC2MB(buf, psz, n);
 998
 999     // latin-1 (direct)
1000 #if ( defined(__BORLANDC__) && (__BORLANDC__ > 0x530) ) \
1001     || ( defined(__MWERKS__) && defined(__WXMSW__) )
1002     size_t len=std::wcslen(psz);
1003 #else
1004     size_t len=::wcslen(psz);
1005 #endif
1006     if (buf)
1007     {
1008         for (size_t c = 0; c <= len; c++)
1009             buf[c] = (psz[c] > 0xff) ? '?' : psz[c];
1010     }
1011
1012     return len;
1013 }
1014
1015 #endif // wxUSE_WCHAR_T
1016
1017