src/common/strconv.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        strconv.cpp
// Purpose:     Unicode conversion classes
// Author:      Ove Kaaven, Robert Roebling, Vadim Zeitlin
// Modified by:
// Created:     29/01/98
// RCS-ID:      $Id$
// Copyright:   (c) 1999 Ove Kaaven, Robert Roebling, Vadim Zeitlin
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

#ifdef __GNUG__
  #pragma implementation "strconv.h"
#endif

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
  #pragma hdrstop
#endif

#ifdef __WXMSW__
  #include "wx/msw/private.h"
#endif

#include <errno.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>

#ifdef __SALFORDC__
  #include <clib.h>
#endif

#ifdef HAVE_ICONV_H
  #include <iconv.h>
#endif
#ifdef HAVE_LANGINFO_H
  #include <langinfo.h>
#endif

#ifdef __WXMSW__
  #include <windows.h>
#endif

#include "wx/debug.h"
#include "wx/strconv.h"

#ifdef WORDS_BIGENDIAN
#define BSWAP_UCS4(str, len)
#define BSWAP_UCS2(str, len)
#else
#define BSWAP_UCS4(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT32_SWAP_ALWAYS(str[_c]); }
#define BSWAP_UCS2(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT16_SWAP_ALWAYS(str[_c]); }
#define WC_NEED_BSWAP
#endif
#define BSWAP_UTF32(str, len) BSWAP_UCS4(str, len)
#define BSWAP_UTF16(str, len) BSWAP_UCS2(str, len)

#if SIZEOF_WCHAR_T == 4
#define WC_NAME "UCS4"
#define WC_BSWAP BSWAP_UCS4
#elif SIZEOF_WCHAR_T == 2
#define WC_NAME "UTF16"
#define WC_BSWAP BSWAP_UTF16
#define WC_UTF16
#endif

// ----------------------------------------------------------------------------
// globals
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConv *) wxConvCurrent = &wxConvLibc;

// ============================================================================
// implementation
// ============================================================================

#if wxUSE_WCHAR_T

static size_t encode_utf16(wxUint32 input,wxUint16*output)
{
  if (input<=0xffff) {
    if (output) *output++ = input;
    return 1;
  } else
  if (input>=0x110000) {
    return (size_t)-1;
  } else {
    if (output) {
      *output++ = (input >> 10)+0xd7c0;
      *output++ = (input&0x3ff)+0xdc00;
    }
    return 2;
  }
}

static size_t decode_utf16(wxUint16*input,wxUint32&output)
{
  if ((*input<0xd800) || (*input>0xdfff)) {
    output = *input;
    return 1;
  } else
  if ((input[1]<0xdc00) || (input[1]>=0xdfff)) {
    output = *input;
    return (size_t)-1;
  } else {
    output = ((input[0] - 0xd7c0) << 10) + (input[1] - 0xdc00);
    return 2;
  }
}

// ----------------------------------------------------------------------------
// wxMBConv
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConv) wxConvLibc;

size_t wxMBConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
    return wxMB2WC(buf, psz, n);
}

size_t wxMBConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
    return wxWC2MB(buf, psz, n);
}

const wxWCharBuffer wxMBConv::cMB2WC(const char *psz) const
{
    if (psz)
    {
        size_t nLen = MB2WC((wchar_t *) NULL, psz, 0);
        if (nLen == (size_t)-1)
            return wxWCharBuffer((wchar_t *) NULL);
        wxWCharBuffer buf(nLen);
        MB2WC((wchar_t *)(const wchar_t *) buf, psz, nLen);
        return buf;
    }
    else
        return wxWCharBuffer((wchar_t *) NULL);
}

const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *psz) const
{
    if (psz)
    {
        size_t nLen = WC2MB((char *) NULL, psz, 0);
        if (nLen == (size_t)-1)
            return wxCharBuffer((char *) NULL);
        wxCharBuffer buf(nLen);
        WC2MB((char *)(const char *) buf, psz, nLen);
        return buf;
    }
    else
        return wxCharBuffer((char *) NULL);
}

// ----------------------------------------------------------------------------
// standard file conversion
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConvFile) wxConvFile;

// just use the libc conversion for now
size_t wxMBConvFile::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
    return wxMB2WC(buf, psz, n);
}

size_t wxMBConvFile::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
    return wxWC2MB(buf, psz, n);
}

// ----------------------------------------------------------------------------
// standard gdk conversion
// ----------------------------------------------------------------------------

#ifdef __WXGTK12__

WXDLLEXPORT_DATA(wxMBConvGdk) wxConvGdk;

#include <gdk/gdk.h>

size_t wxMBConvGdk::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
  if (buf) {
    return gdk_mbstowcs((GdkWChar *)buf, psz, n);
  } else {
    GdkWChar *nbuf = new GdkWChar[n=strlen(psz)];
    size_t len = gdk_mbstowcs(nbuf, psz, n);
    delete [] nbuf;
    return len;
  }
}

size_t wxMBConvGdk::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
  char *mbstr = gdk_wcstombs((GdkWChar *)psz);
  size_t len = mbstr ? strlen(mbstr) : 0;
  if (buf) {
    if (len > n) len = n;
    memcpy(buf, psz, len);
    if (len < n) buf[len] = 0;
  }
  return len;
}

#endif // GTK > 1.0

// ----------------------------------------------------------------------------
// UTF-7
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConvUTF7) wxConvUTF7;

#if 0
static char utf7_setD[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                        "abcdefghijklmnopqrstuvwxyz"
                        "0123456789'(),-./:?";
static char utf7_setO[]="!\"#$%&*;<=>@[]^_`{|}";
static char utf7_setB[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
                        "abcdefghijklmnopqrstuvwxyz"
                        "0123456789+/";
#endif

// TODO: write actual implementations of UTF-7 here
size_t wxMBConvUTF7::MB2WC(wchar_t * WXUNUSED(buf),
                           const char * WXUNUSED(psz),
                           size_t WXUNUSED(n)) const
{
  return 0;
}

size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
                           const wchar_t * WXUNUSED(psz),
                           size_t WXUNUSED(n)) const
{
  return 0;
}

// ----------------------------------------------------------------------------
// UTF-8
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConvUTF8) wxConvUTF8;

static wxUint32 utf8_max[]={0x7f,0x7ff,0xffff,0x1fffff,0x3ffffff,0x7fffffff,0xffffffff};

size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
  size_t len = 0;

  while (*psz && ((!buf) || (len<n))) {
    unsigned char cc=*psz++, fc=cc;
    unsigned cnt;
    for (cnt=0; fc&0x80; cnt++) fc<<=1;
    if (!cnt) {
      // plain ASCII char
      if (buf) *buf++=cc;
      len++;
    } else {
      cnt--;
      if (!cnt) {
        // invalid UTF-8 sequence
        return (size_t)-1;
      } else {
        unsigned ocnt=cnt-1;
        wxUint32 res=cc&(0x3f>>cnt);
        while (cnt--) {
          cc = *psz++;
          if ((cc&0xC0)!=0x80) {
            // invalid UTF-8 sequence
            return (size_t)-1;
          }
          res=(res<<6)|(cc&0x3f);
        }
        if (res<=utf8_max[ocnt]) {
          // illegal UTF-8 encoding
          return (size_t)-1;
        }
#ifdef WC_UTF16
        size_t pa = encode_utf16(res, buf);
        if (pa == (size_t)-1)
          return (size_t)-1;
        if (buf) buf+=pa;
        len+=pa;
#else
        if (buf) *buf++=res;
        len++;
#endif
      }
    }
  }
  if (buf && (len<n)) *buf = 0;
  return len;
}

size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
  size_t len = 0;

  while (*psz && ((!buf) || (len<n))) {
    wxUint32 cc;
#ifdef WC_UTF16
    size_t pa = decode_utf16(psz,cc);
    psz += (pa == (size_t)-1) ? 1 : pa;
#else
    cc=(*psz++)&0x7fffffff;
#endif
    unsigned cnt;
    for (cnt=0; cc>utf8_max[cnt]; cnt++);
    if (!cnt) {
      // plain ASCII char
      if (buf) *buf++=cc;
      len++;
    } else {
      len+=cnt+1;
      if (buf) {
        *buf++=(-128>>cnt)|((cc>>(cnt*6))&(0x3f>>cnt));
        while (cnt--)
          *buf++=0x80|((cc>>(cnt*6))&0x3f);
      }
    }
  }
  if (buf && (len<n)) *buf = 0;
  return len;
}

// ----------------------------------------------------------------------------
// specified character set
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxCSConv) wxConvLocal((const wxChar *)NULL);

#include "wx/encconv.h"
#include "wx/fontmap.h"

// TODO: add some tables here
// - perhaps common encodings to common codepages (for Win32)
// - perhaps common encodings to objects ("UTF8" -> wxConvUTF8)
// - move wxEncodingConverter meat in here

#ifdef __WIN32__
#include "wx/msw/registry.h"
// this should work if M$ Internet Exploiter is installed
static long CharsetToCodepage(const wxChar *name)
{
  if (!name) return GetACP();
  long CP=-1;
  wxString cn(name);
  do {
    wxString path(wxT("MIME\\Database\\Charset\\"));
    path += cn;
    wxRegKey key(wxRegKey::HKCR,path);

    /* two cases: either there's an AliasForCharset string,
     * or there are Codepage and InternetEncoding dwords.
     * The InternetEncoding gives us the actual encoding,
     * the Codepage just says which Windows character set to
     * use when displaying the data.
     */
    if (key.QueryValue(wxT("InternetEncoding"),&CP)) break;
    // no encoding, see if it's an alias
    if (!key.QueryValue(wxT("AliasForCharset"),cn)) break;
  } while (1);
  return CP;
}
#endif

class wxCharacterSet
{
public:
  const wxChar*cname;
  wxCharacterSet(const wxChar*name) : cname(name) {}
  virtual ~wxCharacterSet() {}
  virtual size_t MB2WC(wchar_t*buf, const char*psz, size_t n) { return (size_t)-1; }
  virtual size_t WC2MB(char*buf, const wchar_t*psz, size_t n) { return (size_t)-1; }
  virtual bool usable() { return FALSE; }
};

class ID_CharSet : public wxCharacterSet
{
public:
  wxMBConv*work;
  ID_CharSet(const wxChar*name,wxMBConv*cnv) : wxCharacterSet(name), work(cnv) {}
  size_t MB2WC(wchar_t*buf, const char*psz, size_t n)
  { return work ? work->MB2WC(buf,psz,n) : (size_t)-1; }
  size_t WC2MB(char*buf, const wchar_t*psz, size_t n)
  { return work ? work->WC2MB(buf,psz,n) : (size_t)-1; }
  bool usable() { return work!=NULL; }
};

#ifdef HAVE_ICONV_H
class IC_CharSet : public wxCharacterSet
{
public:
  iconv_t m2w, w2m;
  IC_CharSet(const wxChar*name) : wxCharacterSet(name), m2w((iconv_t)-1), w2m((iconv_t)-1) {}
  ~IC_CharSet() {
    if (m2w!=(iconv_t)-1) iconv_close(m2w);
    if (w2m!=(iconv_t)-1) iconv_close(w2m);
  }
  void LoadM2W() { if (m2w==(iconv_t)-1) m2w=iconv_open(WC_NAME,wxConvLibc.cWX2MB(cname)); }
  void LoadW2M() { if (w2m==(iconv_t)-1) w2m=iconv_open(wxConvLibc.cWX2MB(cname),WC_NAME); }
  size_t MB2WC(wchar_t*buf, const char*psz, size_t n) {
    LoadM2W();
    size_t inbuf = strlen(psz);
    size_t outbuf = n*SIZEOF_WCHAR_T;
    size_t res, cres;
    fprintf(stderr,"IC Convert to WC using %s\n",(const char*)wxConvLibc.cWX2MB(cname));
    if (buf) {
      // have destination buffer, convert there
      cres = iconv(m2w,&psz,&inbuf,(char**)&buf,&outbuf);
      res = n-(outbuf/SIZEOF_WCHAR_T);
      // convert to native endianness
      WC_BSWAP(buf, res)
    } else {
      // no destination buffer... convert using temp buffer
      // to calculate destination buffer requirement
      wchar_t tbuf[8];
      res = 0;
      do {
        buf = tbuf; outbuf = 8*SIZEOF_WCHAR_T;
        cres = iconv(m2w,&psz,&inbuf,(char**)&buf,&outbuf);
        res += 8-(outbuf/SIZEOF_WCHAR_T);
      } while ((cres==(size_t)-1) && (errno==E2BIG));
    }
    if (cres==(size_t)-1) return (size_t)-1;
    return res;
  }
  size_t WC2MB(char*buf, const wchar_t*psz, size_t n) {
    LoadW2M();
#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
    size_t inbuf = std::wcslen(psz);
#else
    size_t inbuf = ::wcslen(psz);
#endif
    size_t outbuf = n;
    size_t res, cres;
    fprintf(stderr,"IC Convert from WC using %s\n",(const char*)wxConvLibc.cWX2MB(cname));
#ifdef WC_NEED_BSWAP
    // need to copy to temp buffer to switch endianness
    // this absolutely doesn't rock!
    // (no, doing WC_BSWAP twice on the original buffer won't help, as it
    //  could be in read-only memory, or be accessed in some other thread)
    wchar_t*tmpbuf=(wchar_t*)malloc((inbuf+1)*SIZEOF_WCHAR_T);
    memcpy(tmpbuf,psz,(inbuf+1)*SIZEOF_WCHAR_T);
    WC_BSWAP(tmpbuf, inbuf)
    psz=tmpbuf;
#endif
    if (buf) {
      // have destination buffer, convert there
      cres = iconv(w2m,(const char**)&psz,&inbuf,&buf,&outbuf);
      res = n-outbuf;
    } else {
      // no destination buffer... convert using temp buffer
      // to calculate destination buffer requirement
      char tbuf[16];
      res = 0;
      do {
        buf = tbuf; outbuf = 16;
        cres = iconv(w2m,(const char**)&psz,&inbuf,&buf,&outbuf);
        res += 16 - outbuf;
      } while ((cres==(size_t)-1) && (errno==E2BIG));
    }
#ifdef WC_NEED_BSWAP
    free(tmpbuf);
#endif
    if (cres==(size_t)-1) return (size_t)-1;
    return res;
  }
  bool usable() { return TRUE; }
};
#endif

#ifdef __WIN32__
class CP_CharSet : public wxCharacterSet
{
public:
  long CodePage;
  CP_CharSet(const wxChar*name) : wxCharacterSet(name), CodePage(CharsetToCodepage(name)) {}
  size_t MB2WC(wchar_t*buf, const char*psz, size_t n) {
    size_t len = MultiByteToWideChar(CodePage,0,psz,-1,buf,buf?n:0);
    return len?len:(size_t)-1;
  }
  size_t WC2MB(char*buf, const wchar_t*psz, size_t n) {
    size_t len = WideCharToMultiByte(CodePage,0,psz,-1,buf,buf?n:0,NULL,NULL);
    return len?len:(size_t)-1;
  }
  bool usable() { return CodePage!=-1; }
};
#endif

class EC_CharSet : public wxCharacterSet
{
public:
  // temporarily just use wxEncodingConverter stuff,
  // so that it works while a better implementation is built
  wxFontEncoding enc;
  wxEncodingConverter m2w, w2m;
  EC_CharSet(const wxChar*name) : wxCharacterSet(name), enc(wxFONTENCODING_SYSTEM)
  {
    if (name) enc = wxTheFontMapper->CharsetToEncoding(name, FALSE);
    m2w.Init(enc, wxFONTENCODING_UNICODE);
    w2m.Init(wxFONTENCODING_UNICODE, enc);
  }
  size_t MB2WC(wchar_t*buf, const char*psz, size_t n) {
    size_t inbuf = strlen(psz);
    fprintf(stderr,"EC Convert to WC using %d\n",enc);
    if (buf) m2w.Convert(psz,buf);
    return inbuf;
  }
  size_t WC2MB(char*buf, const wchar_t*psz, size_t n) {
#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
    size_t inbuf = std::wcslen(psz);
#else
    size_t inbuf = ::wcslen(psz);
#endif
    fprintf(stderr,"EC Convert from WC using %d\n",enc);
    if (buf) w2m.Convert(psz,buf);
    return inbuf;
  }
  bool usable() { return (enc!=wxFONTENCODING_SYSTEM) && (enc!=wxFONTENCODING_DEFAULT); }
};

static wxCharacterSet *wxGetCharacterSet(const wxChar *name)
{
  wxCharacterSet *cset = NULL;
  if (name) {
    if (!wxStricmp(name, wxT("UTF8")) || !wxStricmp(name, wxT("UTF-8"))) {
      cset = new ID_CharSet(name, &wxConvUTF8);
    } else {
#ifdef HAVE_ICONV_H
      cset = new IC_CharSet(name); // may not take NULL
#endif
    }
  }
  if (cset && cset->usable()) return cset;
  if (cset) delete cset;
#ifdef __WIN32__
  cset = new CP_CharSet(name); // may take NULL
  if (cset->usable()) return cset;
#endif
  if (cset) delete cset;
  cset = new EC_CharSet(name);
  if (cset->usable()) return cset;
  delete cset;
  return NULL;
}

wxCSConv::wxCSConv(const wxChar *charset)
{
  m_name = (wxChar *) NULL;
  m_cset = (wxCharacterSet *) NULL;
  m_deferred = TRUE;
  SetName(charset);
}

wxCSConv::~wxCSConv()
{
  if (m_name) free(m_name);
  if (m_cset) delete m_cset;
}

void wxCSConv::SetName(const wxChar *charset)
{
  if (charset) {
    m_name = wxStrdup(charset);
    m_deferred = TRUE;
  }
}

void wxCSConv::LoadNow()
{
//  wxPrintf(wxT("Conversion request\n"));
  if (m_deferred) {
    if (!m_name) {
#ifdef __UNIX__
#if defined(HAVE_LANGINFO_H) && defined(CODESET)
      // GNU libc provides current character set this way
      char*alang = nl_langinfo(CODESET);
      if (alang) SetName(wxConvLibc.cMB2WX(alang));
      else
#endif
      // if we can't get at the character set directly,
      // try to see if it's in the environment variables
      // (in most cases this won't work, but I was out of ideas)
      {
        wxChar *lang = wxGetenv(wxT("LC_ALL"));
        if (!lang) lang = wxGetenv(wxT("LC_CTYPE"));
        if (!lang) lang = wxGetenv(wxT("LANG"));
        wxChar *dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar *)NULL;
        if (dot) SetName(dot+1);
      }
#endif
    }
    m_cset = wxGetCharacterSet(m_name);
    m_deferred = FALSE;
  }
}

size_t wxCSConv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
{
  ((wxCSConv *)this)->LoadNow(); // discard constness
  if (m_cset)
    return m_cset->MB2WC(buf, psz, n);

  // latin-1 (direct)
  size_t len=strlen(psz);
  if (buf) {
    for (size_t c=0; c<=len; c++)
      buf[c] = (unsigned char)(psz[c]);
  }
  return len;
}

size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
{
  ((wxCSConv *)this)->LoadNow(); // discard constness
  if (m_cset)
    return m_cset->WC2MB(buf, psz, n);

  // latin-1 (direct)
#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
  size_t len=std::wcslen(psz);
#else
  size_t len=::wcslen(psz);
#endif
  if (buf) {
    for (size_t c=0; c<=len; c++)
      buf[c] = (psz[c]>0xff) ? '?' : psz[c];
  }
  return len;
}

#ifdef HAVE_ICONV_H
class IC_CharSetConverter
{
public:
  iconv_t cnv;
  IC_CharSetConverter(IC_CharSet*from,IC_CharSet*to) {
    cnv=iconv_open(wxConvLibc.cWX2MB(to->cname),wxConvLibc.cWX2MB(from->cname));
  }
  ~IC_CharSetConverter() {
    if (cnv!=(iconv_t)-1) iconv_close(cnv);
  }
  size_t Convert(char*buf, const char*psz, size_t n) {
    size_t inbuf = strlen(psz);
    size_t outbuf = n;
    size_t res = iconv(cnv,&psz,&inbuf,&buf,&outbuf);
    if (res==(size_t)-1) return (size_t)-1;
    return n-outbuf;
  }
};
#endif

class EC_CharSetConverter
{
public:
  wxEncodingConverter cnv;
  EC_CharSetConverter(EC_CharSet*from,EC_CharSet*to) {
    cnv.Init(from->enc,to->enc);
  }
  size_t Convert(char*buf, const char*psz, size_t n) {
    size_t inbuf = strlen(psz);
    if (buf) cnv.Convert(psz,buf);
    return inbuf;
  }
};

#else // !wxUSE_WCHAR_T

// ----------------------------------------------------------------------------
// stand-ins in absence of wchar_t
// ----------------------------------------------------------------------------

WXDLLEXPORT_DATA(wxMBConv) wxConvLibc, wxConvFile;

#endif // wxUSE_WCHAR_T
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: strconv.cpp
	3	// Purpose: Unicode conversion classes
	4	// Author: Ove Kaaven, Robert Roebling, Vadim Zeitlin
	5	// Modified by:
	6	// Created: 29/01/98
	7	// RCS-ID: $Id$
	8	// Copyright: (c) 1999 Ove Kaaven, Robert Roebling, Vadim Zeitlin
	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	#ifdef __WXMSW__
	32	#include "wx/msw/private.h"
	33	#endif
	34
	35	#include <errno.h>
	36	#include <ctype.h>
	37	#include <string.h>
	38	#include <stdlib.h>
	39
	40	#ifdef __SALFORDC__
	41	#include <clib.h>
	42	#endif
	43
	44	#ifdef HAVE_ICONV_H
	45	#include <iconv.h>
	46	#endif
	47	#ifdef HAVE_LANGINFO_H
	48	#include <langinfo.h>
	49	#endif
	50
	51	#ifdef __WXMSW__
	52	#include <windows.h>
	53	#endif
	54
	55	#include "wx/debug.h"
	56	#include "wx/strconv.h"
	57
	58	#ifdef WORDS_BIGENDIAN
	59	#define BSWAP_UCS4(str, len)
	60	#define BSWAP_UCS2(str, len)
	61	#else
	62	#define BSWAP_UCS4(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT32_SWAP_ALWAYS(str[_c]); }
	63	#define BSWAP_UCS2(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT16_SWAP_ALWAYS(str[_c]); }
	64	#define WC_NEED_BSWAP
	65	#endif
	66	#define BSWAP_UTF32(str, len) BSWAP_UCS4(str, len)
	67	#define BSWAP_UTF16(str, len) BSWAP_UCS2(str, len)
	68
	69	#if SIZEOF_WCHAR_T == 4
	70	#define WC_NAME "UCS4"
	71	#define WC_BSWAP BSWAP_UCS4
	72	#elif SIZEOF_WCHAR_T == 2
	73	#define WC_NAME "UTF16"
	74	#define WC_BSWAP BSWAP_UTF16
	75	#define WC_UTF16
	76	#endif
	77
	78	// ----------------------------------------------------------------------------
	79	// globals
	80	// ----------------------------------------------------------------------------
	81
	82	WXDLLEXPORT_DATA(wxMBConv *) wxConvCurrent = &wxConvLibc;
	83
	84	// ============================================================================
	85	// implementation
	86	// ============================================================================
	87
	88	#if wxUSE_WCHAR_T
	89
	90	static size_t encode_utf16(wxUint32 input,wxUint16*output)
	91	{
	92	if (input<=0xffff) {
	93	if (output) *output++ = input;
	94	return 1;
	95	} else
	96	if (input>=0x110000) {
	97	return (size_t)-1;
	98	} else {
	99	if (output) {
	100	*output++ = (input >> 10)+0xd7c0;
	101	*output++ = (input&0x3ff)+0xdc00;
	102	}
	103	return 2;
	104	}
	105	}
	106
	107	static size_t decode_utf16(wxUint16*input,wxUint32&output)
	108	{
	109	if ((input<0xd800) \|\| (input>0xdfff)) {
	110	output = *input;
	111	return 1;
	112	} else
	113	if ((input[1]<0xdc00) \|\| (input[1]>=0xdfff)) {
	114	output = *input;
	115	return (size_t)-1;
	116	} else {
	117	output = ((input[0] - 0xd7c0) << 10) + (input[1] - 0xdc00);
	118	return 2;
	119	}
	120	}
	121
	122	// ----------------------------------------------------------------------------
	123	// wxMBConv
	124	// ----------------------------------------------------------------------------
	125
	126	WXDLLEXPORT_DATA(wxMBConv) wxConvLibc;
	127
	128	size_t wxMBConv::MB2WC(wchar_t buf, const char psz, size_t n) const
	129	{
	130	return wxMB2WC(buf, psz, n);
	131	}
	132
	133	size_t wxMBConv::WC2MB(char buf, const wchar_t psz, size_t n) const
	134	{
	135	return wxWC2MB(buf, psz, n);
	136	}
	137
	138	const wxWCharBuffer wxMBConv::cMB2WC(const char *psz) const
	139	{
	140	if (psz)
	141	{
	142	size_t nLen = MB2WC((wchar_t *) NULL, psz, 0);
	143	if (nLen == (size_t)-1)
	144	return wxWCharBuffer((wchar_t *) NULL);
	145	wxWCharBuffer buf(nLen);
	146	MB2WC((wchar_t )(const wchar_t ) buf, psz, nLen);
	147	return buf;
	148	}
	149	else
	150	return wxWCharBuffer((wchar_t *) NULL);
	151	}
	152
	153	const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *psz) const
	154	{
	155	if (psz)
	156	{
	157	size_t nLen = WC2MB((char *) NULL, psz, 0);
	158	if (nLen == (size_t)-1)
	159	return wxCharBuffer((char *) NULL);
	160	wxCharBuffer buf(nLen);
	161	WC2MB((char )(const char ) buf, psz, nLen);
	162	return buf;
	163	}
	164	else
	165	return wxCharBuffer((char *) NULL);
	166	}
	167
	168	// ----------------------------------------------------------------------------
	169	// standard file conversion
	170	// ----------------------------------------------------------------------------
	171
	172	WXDLLEXPORT_DATA(wxMBConvFile) wxConvFile;
	173
	174	// just use the libc conversion for now
	175	size_t wxMBConvFile::MB2WC(wchar_t buf, const char psz, size_t n) const
	176	{
	177	return wxMB2WC(buf, psz, n);
	178	}
	179
	180	size_t wxMBConvFile::WC2MB(char buf, const wchar_t psz, size_t n) const
	181	{
	182	return wxWC2MB(buf, psz, n);
	183	}
	184
	185	// ----------------------------------------------------------------------------
	186	// standard gdk conversion
	187	// ----------------------------------------------------------------------------
	188
	189	#ifdef __WXGTK12__
	190
	191	WXDLLEXPORT_DATA(wxMBConvGdk) wxConvGdk;
	192
	193	#include <gdk/gdk.h>
	194
	195	size_t wxMBConvGdk::MB2WC(wchar_t buf, const char psz, size_t n) const
	196	{
	197	if (buf) {
	198	return gdk_mbstowcs((GdkWChar *)buf, psz, n);
	199	} else {
	200	GdkWChar *nbuf = new GdkWChar[n=strlen(psz)];
	201	size_t len = gdk_mbstowcs(nbuf, psz, n);
	202	delete [] nbuf;
	203	return len;
	204	}
	205	}
	206
	207	size_t wxMBConvGdk::WC2MB(char buf, const wchar_t psz, size_t n) const
	208	{
	209	char mbstr = gdk_wcstombs((GdkWChar )psz);
	210	size_t len = mbstr ? strlen(mbstr) : 0;
	211	if (buf) {
	212	if (len > n) len = n;
	213	memcpy(buf, psz, len);
	214	if (len < n) buf[len] = 0;
	215	}
	216	return len;
	217	}
	218
	219	#endif // GTK > 1.0
	220
	221	// ----------------------------------------------------------------------------
	222	// UTF-7
	223	// ----------------------------------------------------------------------------
	224
	225	WXDLLEXPORT_DATA(wxMBConvUTF7) wxConvUTF7;
	226
	227	#if 0
	228	static char utf7_setD[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	229	"abcdefghijklmnopqrstuvwxyz"
	230	"0123456789'(),-./:?";
	231	static char utf7_setO[]="!\"#$%&*;<=>@[]^_`{\|}";
	232	static char utf7_setB[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
	233	"abcdefghijklmnopqrstuvwxyz"
	234	"0123456789+/";
	235	#endif
	236
	237	// TODO: write actual implementations of UTF-7 here
	238	size_t wxMBConvUTF7::MB2WC(wchar_t * WXUNUSED(buf),
	239	const char * WXUNUSED(psz),
	240	size_t WXUNUSED(n)) const
	241	{
	242	return 0;
	243	}
	244
	245	size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
	246	const wchar_t * WXUNUSED(psz),
	247	size_t WXUNUSED(n)) const
	248	{
	249	return 0;
	250	}
	251
	252	// ----------------------------------------------------------------------------
	253	// UTF-8
	254	// ----------------------------------------------------------------------------
	255
	256	WXDLLEXPORT_DATA(wxMBConvUTF8) wxConvUTF8;
	257
	258	static wxUint32 utf8_max[]={0x7f,0x7ff,0xffff,0x1fffff,0x3ffffff,0x7fffffff,0xffffffff};
	259
	260	size_t wxMBConvUTF8::MB2WC(wchar_t buf, const char psz, size_t n) const
	261	{
	262	size_t len = 0;
	263
	264	while (*psz && ((!buf) \|\| (len<n))) {
	265	unsigned char cc=*psz++, fc=cc;
	266	unsigned cnt;
	267	for (cnt=0; fc&0x80; cnt++) fc<<=1;
	268	if (!cnt) {
	269	// plain ASCII char
	270	if (buf) *buf++=cc;
	271	len++;
	272	} else {
	273	cnt--;
	274	if (!cnt) {
	275	// invalid UTF-8 sequence
	276	return (size_t)-1;
	277	} else {
	278	unsigned ocnt=cnt-1;
	279	wxUint32 res=cc&(0x3f>>cnt);
	280	while (cnt--) {
	281	cc = *psz++;
	282	if ((cc&0xC0)!=0x80) {
	283	// invalid UTF-8 sequence
	284	return (size_t)-1;
	285	}
	286	res=(res<<6)\|(cc&0x3f);
	287	}
	288	if (res<=utf8_max[ocnt]) {
	289	// illegal UTF-8 encoding
	290	return (size_t)-1;
	291	}
	292	#ifdef WC_UTF16
	293	size_t pa = encode_utf16(res, buf);
	294	if (pa == (size_t)-1)
	295	return (size_t)-1;
	296	if (buf) buf+=pa;
	297	len+=pa;
	298	#else
	299	if (buf) *buf++=res;
	300	len++;
	301	#endif
	302	}
	303	}
	304	}
	305	if (buf && (len<n)) *buf = 0;
	306	return len;
	307	}
	308
	309	size_t wxMBConvUTF8::WC2MB(char buf, const wchar_t psz, size_t n) const
	310	{
	311	size_t len = 0;
	312
	313	while (*psz && ((!buf) \|\| (len<n))) {
	314	wxUint32 cc;
	315	#ifdef WC_UTF16
	316	size_t pa = decode_utf16(psz,cc);
	317	psz += (pa == (size_t)-1) ? 1 : pa;
	318	#else
	319	cc=(*psz++)&0x7fffffff;
	320	#endif
	321	unsigned cnt;
	322	for (cnt=0; cc>utf8_max[cnt]; cnt++);
	323	if (!cnt) {
	324	// plain ASCII char
	325	if (buf) *buf++=cc;
	326	len++;
	327	} else {
	328	len+=cnt+1;
	329	if (buf) {
	330	buf++=(-128>>cnt)\|((cc>>(cnt6))&(0x3f>>cnt));
	331	while (cnt--)
	332	buf++=0x80\|((cc>>(cnt6))&0x3f);
	333	}
	334	}
	335	}
	336	if (buf && (len<n)) *buf = 0;
	337	return len;
	338	}
	339
	340	// ----------------------------------------------------------------------------
	341	// specified character set
	342	// ----------------------------------------------------------------------------
	343
	344	WXDLLEXPORT_DATA(wxCSConv) wxConvLocal((const wxChar *)NULL);
	345
	346	#include "wx/encconv.h"
	347	#include "wx/fontmap.h"
	348
	349	// TODO: add some tables here
	350	// - perhaps common encodings to common codepages (for Win32)
	351	// - perhaps common encodings to objects ("UTF8" -> wxConvUTF8)
	352	// - move wxEncodingConverter meat in here
	353
	354	#ifdef __WIN32__
	355	#include "wx/msw/registry.h"
	356	// this should work if M$ Internet Exploiter is installed
	357	static long CharsetToCodepage(const wxChar *name)
	358	{
	359	if (!name) return GetACP();
	360	long CP=-1;
	361	wxString cn(name);
	362	do {
	363	wxString path(wxT("MIME\\Database\\Charset\\"));
	364	path += cn;
	365	wxRegKey key(wxRegKey::HKCR,path);
	366
	367	/* two cases: either there's an AliasForCharset string,
	368	* or there are Codepage and InternetEncoding dwords.
	369	* The InternetEncoding gives us the actual encoding,
	370	* the Codepage just says which Windows character set to
	371	* use when displaying the data.
	372	*/
	373	if (key.QueryValue(wxT("InternetEncoding"),&CP)) break;
	374	// no encoding, see if it's an alias
	375	if (!key.QueryValue(wxT("AliasForCharset"),cn)) break;
	376	} while (1);
	377	return CP;
	378	}
	379	#endif
	380
	381	class wxCharacterSet
	382	{
	383	public:
	384	const wxChar*cname;
	385	wxCharacterSet(const wxChar*name) : cname(name) {}
	386	virtual ~wxCharacterSet() {}
	387	virtual size_t MB2WC(wchar_tbuf, const charpsz, size_t n) { return (size_t)-1; }
	388	virtual size_t WC2MB(charbuf, const wchar_tpsz, size_t n) { return (size_t)-1; }
	389	virtual bool usable() { return FALSE; }
	390	};
	391
	392	class ID_CharSet : public wxCharacterSet
	393	{
	394	public:
	395	wxMBConv*work;
	396	ID_CharSet(const wxCharname,wxMBConvcnv) : wxCharacterSet(name), work(cnv) {}
	397	size_t MB2WC(wchar_tbuf, const charpsz, size_t n)
	398	{ return work ? work->MB2WC(buf,psz,n) : (size_t)-1; }
	399	size_t WC2MB(charbuf, const wchar_tpsz, size_t n)
	400	{ return work ? work->WC2MB(buf,psz,n) : (size_t)-1; }
	401	bool usable() { return work!=NULL; }
	402	};
	403
	404	#ifdef HAVE_ICONV_H
	405	class IC_CharSet : public wxCharacterSet
	406	{
	407	public:
	408	iconv_t m2w, w2m;
	409	IC_CharSet(const wxChar*name) : wxCharacterSet(name), m2w((iconv_t)-1), w2m((iconv_t)-1) {}
	410	~IC_CharSet() {
	411	if (m2w!=(iconv_t)-1) iconv_close(m2w);
	412	if (w2m!=(iconv_t)-1) iconv_close(w2m);
	413	}
	414	void LoadM2W() { if (m2w==(iconv_t)-1) m2w=iconv_open(WC_NAME,wxConvLibc.cWX2MB(cname)); }
	415	void LoadW2M() { if (w2m==(iconv_t)-1) w2m=iconv_open(wxConvLibc.cWX2MB(cname),WC_NAME); }
	416	size_t MB2WC(wchar_tbuf, const charpsz, size_t n) {
	417	LoadM2W();
	418	size_t inbuf = strlen(psz);
	419	size_t outbuf = n*SIZEOF_WCHAR_T;
	420	size_t res, cres;
	421	fprintf(stderr,"IC Convert to WC using %s\n",(const char*)wxConvLibc.cWX2MB(cname));
	422	if (buf) {
	423	// have destination buffer, convert there
	424	cres = iconv(m2w,&psz,&inbuf,(char**)&buf,&outbuf);
	425	res = n-(outbuf/SIZEOF_WCHAR_T);
	426	// convert to native endianness
	427	WC_BSWAP(buf, res)
	428	} else {
	429	// no destination buffer... convert using temp buffer
	430	// to calculate destination buffer requirement
	431	wchar_t tbuf[8];
	432	res = 0;
	433	do {
	434	buf = tbuf; outbuf = 8*SIZEOF_WCHAR_T;
	435	cres = iconv(m2w,&psz,&inbuf,(char**)&buf,&outbuf);
	436	res += 8-(outbuf/SIZEOF_WCHAR_T);
	437	} while ((cres==(size_t)-1) && (errno==E2BIG));
	438	}
	439	if (cres==(size_t)-1) return (size_t)-1;
	440	return res;
	441	}
	442	size_t WC2MB(charbuf, const wchar_tpsz, size_t n) {
	443	LoadW2M();
	444	#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
	445	size_t inbuf = std::wcslen(psz);
	446	#else
	447	size_t inbuf = ::wcslen(psz);
	448	#endif
	449	size_t outbuf = n;
	450	size_t res, cres;
	451	fprintf(stderr,"IC Convert from WC using %s\n",(const char*)wxConvLibc.cWX2MB(cname));
	452	#ifdef WC_NEED_BSWAP
	453	// need to copy to temp buffer to switch endianness
	454	// this absolutely doesn't rock!
	455	// (no, doing WC_BSWAP twice on the original buffer won't help, as it
	456	// could be in read-only memory, or be accessed in some other thread)
	457	wchar_ttmpbuf=(wchar_t)malloc((inbuf+1)*SIZEOF_WCHAR_T);
	458	memcpy(tmpbuf,psz,(inbuf+1)*SIZEOF_WCHAR_T);
	459	WC_BSWAP(tmpbuf, inbuf)
	460	psz=tmpbuf;
	461	#endif
	462	if (buf) {
	463	// have destination buffer, convert there
	464	cres = iconv(w2m,(const char**)&psz,&inbuf,&buf,&outbuf);
	465	res = n-outbuf;
	466	} else {
	467	// no destination buffer... convert using temp buffer
	468	// to calculate destination buffer requirement
	469	char tbuf[16];
	470	res = 0;
	471	do {
	472	buf = tbuf; outbuf = 16;
	473	cres = iconv(w2m,(const char**)&psz,&inbuf,&buf,&outbuf);
	474	res += 16 - outbuf;
	475	} while ((cres==(size_t)-1) && (errno==E2BIG));
	476	}
	477	#ifdef WC_NEED_BSWAP
	478	free(tmpbuf);
	479	#endif
	480	if (cres==(size_t)-1) return (size_t)-1;
	481	return res;
	482	}
	483	bool usable() { return TRUE; }
	484	};
	485	#endif
	486
	487	#ifdef __WIN32__
	488	class CP_CharSet : public wxCharacterSet
	489	{
	490	public:
	491	long CodePage;
	492	CP_CharSet(const wxChar*name) : wxCharacterSet(name), CodePage(CharsetToCodepage(name)) {}
	493	size_t MB2WC(wchar_tbuf, const charpsz, size_t n) {
	494	size_t len = MultiByteToWideChar(CodePage,0,psz,-1,buf,buf?n:0);
	495	return len?len:(size_t)-1;
	496	}
	497	size_t WC2MB(charbuf, const wchar_tpsz, size_t n) {
	498	size_t len = WideCharToMultiByte(CodePage,0,psz,-1,buf,buf?n:0,NULL,NULL);
	499	return len?len:(size_t)-1;
	500	}
	501	bool usable() { return CodePage!=-1; }
	502	};
	503	#endif
	504
	505	class EC_CharSet : public wxCharacterSet
	506	{
	507	public:
	508	// temporarily just use wxEncodingConverter stuff,
	509	// so that it works while a better implementation is built
	510	wxFontEncoding enc;
	511	wxEncodingConverter m2w, w2m;
	512	EC_CharSet(const wxChar*name) : wxCharacterSet(name), enc(wxFONTENCODING_SYSTEM)
	513	{
	514	if (name) enc = wxTheFontMapper->CharsetToEncoding(name, FALSE);
	515	m2w.Init(enc, wxFONTENCODING_UNICODE);
	516	w2m.Init(wxFONTENCODING_UNICODE, enc);
	517	}
	518	size_t MB2WC(wchar_tbuf, const charpsz, size_t n) {
	519	size_t inbuf = strlen(psz);
	520	fprintf(stderr,"EC Convert to WC using %d\n",enc);
	521	if (buf) m2w.Convert(psz,buf);
	522	return inbuf;
	523	}
	524	size_t WC2MB(charbuf, const wchar_tpsz, size_t n) {
	525	#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
	526	size_t inbuf = std::wcslen(psz);
	527	#else
	528	size_t inbuf = ::wcslen(psz);
	529	#endif
	530	fprintf(stderr,"EC Convert from WC using %d\n",enc);
	531	if (buf) w2m.Convert(psz,buf);
	532	return inbuf;
	533	}
	534	bool usable() { return (enc!=wxFONTENCODING_SYSTEM) && (enc!=wxFONTENCODING_DEFAULT); }
	535	};
	536
	537	static wxCharacterSet wxGetCharacterSet(const wxChar name)
	538	{
	539	wxCharacterSet *cset = NULL;
	540	if (name) {
	541	if (!wxStricmp(name, wxT("UTF8")) \|\| !wxStricmp(name, wxT("UTF-8"))) {
	542	cset = new ID_CharSet(name, &wxConvUTF8);
	543	} else {
	544	#ifdef HAVE_ICONV_H
	545	cset = new IC_CharSet(name); // may not take NULL
	546	#endif
	547	}
	548	}
	549	if (cset && cset->usable()) return cset;
	550	if (cset) delete cset;
	551	#ifdef __WIN32__
	552	cset = new CP_CharSet(name); // may take NULL
	553	if (cset->usable()) return cset;
	554	#endif
	555	if (cset) delete cset;
	556	cset = new EC_CharSet(name);
	557	if (cset->usable()) return cset;
	558	delete cset;
	559	return NULL;
	560	}
	561
	562	wxCSConv::wxCSConv(const wxChar *charset)
	563	{
	564	m_name = (wxChar *) NULL;
	565	m_cset = (wxCharacterSet *) NULL;
	566	m_deferred = TRUE;
	567	SetName(charset);
	568	}
	569
	570	wxCSConv::~wxCSConv()
	571	{
	572	if (m_name) free(m_name);
	573	if (m_cset) delete m_cset;
	574	}
	575
	576	void wxCSConv::SetName(const wxChar *charset)
	577	{
	578	if (charset) {
	579	m_name = wxStrdup(charset);
	580	m_deferred = TRUE;
	581	}
	582	}
	583
	584	void wxCSConv::LoadNow()
	585	{
	586	// wxPrintf(wxT("Conversion request\n"));
	587	if (m_deferred) {
	588	if (!m_name) {
	589	#ifdef __UNIX__
	590	#if defined(HAVE_LANGINFO_H) && defined(CODESET)
	591	// GNU libc provides current character set this way
	592	char*alang = nl_langinfo(CODESET);
	593	if (alang) SetName(wxConvLibc.cMB2WX(alang));
	594	else
	595	#endif
	596	// if we can't get at the character set directly,
	597	// try to see if it's in the environment variables
	598	// (in most cases this won't work, but I was out of ideas)
	599	{
	600	wxChar *lang = wxGetenv(wxT("LC_ALL"));
	601	if (!lang) lang = wxGetenv(wxT("LC_CTYPE"));
	602	if (!lang) lang = wxGetenv(wxT("LANG"));
	603	wxChar dot = lang ? wxStrchr(lang, wxT('.')) : (wxChar )NULL;
	604	if (dot) SetName(dot+1);
	605	}
	606	#endif
	607	}
	608	m_cset = wxGetCharacterSet(m_name);
	609	m_deferred = FALSE;
	610	}
	611	}
	612
	613	size_t wxCSConv::MB2WC(wchar_t buf, const char psz, size_t n) const
	614	{
	615	((wxCSConv *)this)->LoadNow(); // discard constness
	616	if (m_cset)
	617	return m_cset->MB2WC(buf, psz, n);
	618
	619	// latin-1 (direct)
	620	size_t len=strlen(psz);
	621	if (buf) {
	622	for (size_t c=0; c<=len; c++)
	623	buf[c] = (unsigned char)(psz[c]);
	624	}
	625	return len;
	626	}
	627
	628	size_t wxCSConv::WC2MB(char buf, const wchar_t psz, size_t n) const
	629	{
	630	((wxCSConv *)this)->LoadNow(); // discard constness
	631	if (m_cset)
	632	return m_cset->WC2MB(buf, psz, n);
	633
	634	// latin-1 (direct)
	635	#if defined(__BORLANDC__) && (__BORLANDC__ > 0x530)
	636	size_t len=std::wcslen(psz);
	637	#else
	638	size_t len=::wcslen(psz);
	639	#endif
	640	if (buf) {
	641	for (size_t c=0; c<=len; c++)
	642	buf[c] = (psz[c]>0xff) ? '?' : psz[c];
	643	}
	644	return len;
	645	}
	646
	647	#ifdef HAVE_ICONV_H
	648	class IC_CharSetConverter
	649	{
	650	public:
	651	iconv_t cnv;
	652	IC_CharSetConverter(IC_CharSetfrom,IC_CharSetto) {
	653	cnv=iconv_open(wxConvLibc.cWX2MB(to->cname),wxConvLibc.cWX2MB(from->cname));
	654	}
	655	~IC_CharSetConverter() {
	656	if (cnv!=(iconv_t)-1) iconv_close(cnv);
	657	}
	658	size_t Convert(charbuf, const charpsz, size_t n) {
	659	size_t inbuf = strlen(psz);
	660	size_t outbuf = n;
	661	size_t res = iconv(cnv,&psz,&inbuf,&buf,&outbuf);
	662	if (res==(size_t)-1) return (size_t)-1;
	663	return n-outbuf;
	664	}
	665	};
	666	#endif
	667
	668	class EC_CharSetConverter
	669	{
	670	public:
	671	wxEncodingConverter cnv;
	672	EC_CharSetConverter(EC_CharSetfrom,EC_CharSetto) {
	673	cnv.Init(from->enc,to->enc);
	674	}
	675	size_t Convert(charbuf, const charpsz, size_t n) {
	676	size_t inbuf = strlen(psz);
	677	if (buf) cnv.Convert(psz,buf);
	678	return inbuf;
	679	}
	680	};
	681
	682	#else // !wxUSE_WCHAR_T
	683
	684	// ----------------------------------------------------------------------------
	685	// stand-ins in absence of wchar_t
	686	// ----------------------------------------------------------------------------
	687
	688	WXDLLEXPORT_DATA(wxMBConv) wxConvLibc, wxConvFile;
	689
	690	#endif // wxUSE_WCHAR_T
	691
	692