X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/6001e347baf63a91be525f3b9beeefde4bc16f19..937afade13326376cf1d3071057d069041172daa:/src/common/strconv.cpp

diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index e61b9fd56c..d85340b877 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -9,6 +9,14 @@
 // Licence:     wxWindows license
 /////////////////////////////////////////////////////////////////////////////
 
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
 #ifdef __GNUG__
   #pragma implementation "strconv.h"
 #endif
@@ -20,6 +28,11 @@
   #pragma hdrstop
 #endif
 
+#ifdef __WXMSW__
+  #include "wx/msw/private.h"
+#endif
+
+#include <errno.h>
 #include <ctype.h>
 #include <string.h>
 #include <stdlib.h>
@@ -28,27 +41,91 @@
   #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"
 
-//----------------------------------------------------------------------------
-// wxConvCurrent
-//----------------------------------------------------------------------------
+#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;
 
-#if !wxUSE_WCHAR_T
-//----------------------------------------------------------------------------
-// stand-ins in absence of wchar_t
-//----------------------------------------------------------------------------
+// ============================================================================
+// implementation
+// ============================================================================
 
-WXDLLEXPORT_DATA(wxMBConv) wxConvLibc, wxConvFile;
+#if wxUSE_WCHAR_T
 
-#else
+#ifdef WC_UTF16
+
+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;
+  }
+}
+
+#endif // WC_UTF16
 
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // wxMBConv
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 
 WXDLLEXPORT_DATA(wxMBConv) wxConvLibc;
 
@@ -64,33 +141,37 @@ size_t wxMBConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 
 const wxWCharBuffer wxMBConv::cMB2WC(const char *psz) const
 {
-    if (psz) 
+    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 
+    }
+    else
         return wxWCharBuffer((wchar_t *) NULL);
 }
 
 const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *psz) const
 {
-    if (psz) 
+    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 
+    }
+    else
         return wxCharBuffer((char *) NULL);
 }
 
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // standard file conversion
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 
 WXDLLEXPORT_DATA(wxMBConvFile) wxConvFile;
 
@@ -105,11 +186,11 @@ size_t wxMBConvFile::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     return wxWC2MB(buf, psz, n);
 }
 
-#ifdef __WXGTK12__
-
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // standard gdk conversion
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+
+#ifdef __WXGTK12__
 
 WXDLLEXPORT_DATA(wxMBConvGdk) wxConvGdk;
 
@@ -138,6 +219,7 @@ size_t wxMBConvGdk::WC2MB(char *buf, const wchar_t *psz, size_t n) const
   }
   return len;
 }
+
 #endif // GTK > 1.0
 
 // ----------------------------------------------------------------------------
@@ -171,13 +253,13 @@ size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
   return 0;
 }
 
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 // UTF-8
-//----------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
 
 WXDLLEXPORT_DATA(wxMBConvUTF8) wxConvUTF8;
 
-static unsigned long utf8_max[]={0x7f,0x7ff,0xffff,0x1fffff,0x3ffffff,0x7fffffff,0xffffffff};
+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
 {
@@ -198,7 +280,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
         return (size_t)-1;
       } else {
         unsigned ocnt=cnt-1;
-        unsigned long res=cc&(0x3f>>cnt);
+        wxUint32 res=cc&(0x3f>>cnt);
         while (cnt--) {
           cc = *psz++;
           if ((cc&0xC0)!=0x80) {
@@ -211,8 +293,16 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
           // 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
       }
     }
   }
@@ -225,7 +315,13 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
   size_t len = 0;
 
   while (*psz && ((!buf) || (len<n))) {
-    unsigned long cc=(*psz++)&0x7fffffff;
+    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) {
@@ -249,121 +345,223 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 // specified character set
 // ----------------------------------------------------------------------------
 
-#ifndef WX_PRECOMP
-  #include "wx/dynarray.h"
-  #include "wx/filefn.h"
-  #include "wx/textfile.h"
-  #include "wx/tokenzr.h"
-  #include "wx/utils.h"
+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:
-  wxArrayString names;
-  wchar_t *data;
+  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; }
 };
 
-WX_DECLARE_OBJARRAY(wxCharacterSet, wxCSArray);
-#include "wx/arrimpl.cpp"
-WX_DEFINE_OBJARRAY(wxCSArray);
-
-static wxCSArray wxCharsets;
+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; }
+};
 
-static void wxLoadCharacterSets(void)
+#ifdef HAVE_ICONV_H
+class IC_CharSet : public wxCharacterSet
 {
-  static bool already_loaded = FALSE;
-
-  if (already_loaded) return;
-
-  already_loaded = TRUE;
-#if defined(__UNIX__) && wxUSE_TEXTFILE
-  // search through files in /usr/share/i18n/charmaps
-  wxString fname;
-  for (fname = ::wxFindFirstFile(_T("/usr/share/i18n/charmaps/*"));
-       !fname.IsEmpty();
-       fname = ::wxFindNextFile()) {
-    wxTextFile cmap(fname);
-    if (cmap.Open()) {
-      wxCharacterSet *cset = new wxCharacterSet;
-      wxString comchar,escchar;
-      bool in_charset = FALSE;
-
-      // wxFprintf(stderr,_T("Loaded: %s\n"),fname.c_str());
-
-      wxString line;
-      for (line = cmap.GetFirstLine();
-           !cmap.Eof();
-           line = cmap.GetNextLine()) {
-        // wxFprintf(stderr,_T("line contents: %s\n"),line.c_str());
-        wxStringTokenizer token(line);
-        wxString cmd = token.GetNextToken();
-        if (cmd == comchar) {
-          if (token.GetNextToken() == _T("alias"))
-            cset->names.Add(token.GetNextToken());
-        }
-        else if (cmd == _T("<code_set_name>"))
-          cset->names.Add(token.GetNextToken());
-        else if (cmd == _T("<comment_char>"))
-          comchar = token.GetNextToken();
-        else if (cmd == _T("<escape_char>"))
-          escchar = token.GetNextToken();
-        else if (cmd == _T("<mb_cur_min>")) {
-          delete cset;
-          cset = (wxCharacterSet *) NULL;
-          break; // we don't support multibyte charsets ourselves (yet)
-        }
-        else if (cmd == _T("CHARMAP")) {
-          cset->data = (wchar_t *)calloc(256, sizeof(wchar_t));
-          in_charset = TRUE;
-        }
-        else if (cmd == _T("END")) {
-          if (token.GetNextToken() == _T("CHARMAP"))
-            in_charset = FALSE;
-        }
-        else if (in_charset) {
-          // format: <NUL> /x00 <U0000> NULL (NUL)
-          //         <A>   /x41 <U0041> LATIN CAPITAL LETTER A
-          wxString hex = token.GetNextToken();
-          // skip whitespace (why doesn't wxStringTokenizer do this?)
-          while (wxIsEmpty(hex) && token.HasMoreTokens()) hex = token.GetNextToken();
-          wxString uni = token.GetNextToken();
-          // skip whitespace again
-          while (wxIsEmpty(uni) && token.HasMoreTokens()) uni = token.GetNextToken();
-          if ((hex.Len() > 2) && (wxString(hex.GetChar(0)) == escchar) && (hex.GetChar(1) == _T('x')) &&
-              (uni.Left(2) == _T("<U"))) {
-            hex.MakeUpper(); uni.MakeUpper();
-            int pos = ::wxHexToDec(hex.Mid(2,2));
-            if (pos>=0) {
-              unsigned long uni1 = ::wxHexToDec(uni.Mid(2,2));
-              unsigned long uni2 = ::wxHexToDec(uni.Mid(4,2));
-              cset->data[pos] = (uni1 << 16) | uni2;
-              // wxFprintf(stderr,_T("char %02x mapped to %04x (%c)\n"),pos,cset->data[pos],cset->data[pos]);
-            }
-          }
-        }
-      }
-      if (cset) {
-        cset->names.Shrink();
-        wxCharsets.Add(cset);
-      }
+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
-  wxCharsets.Shrink();
-}
 
-static wxCharacterSet *wxFindCharacterSet(const wxChar *charset)
+#ifdef __WIN32__
+class CP_CharSet : public wxCharacterSet
 {
-  if (!charset) return (wxCharacterSet *)NULL;
-  wxLoadCharacterSets();
-  for (size_t n=0; n<wxCharsets.GetCount(); n++)
-    if (wxCharsets[n].names.Index(charset) != wxNOT_FOUND)
-      return &(wxCharsets[n]);
-  return (wxCharacterSet *)NULL;
-}
+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
 
-WXDLLEXPORT_DATA(wxCSConv) wxConvLocal((const wxChar *)NULL);
+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)
 {
@@ -376,46 +574,42 @@ wxCSConv::wxCSConv(const wxChar *charset)
 wxCSConv::~wxCSConv()
 {
   if (m_name) free(m_name);
+  if (m_cset) delete m_cset;
 }
 
 void wxCSConv::SetName(const wxChar *charset)
 {
   if (charset) {
-#ifdef __UNIX__
-    // first, convert the character set name to standard form
-    wxString codeset;
-    if (wxString(charset,3).CmpNoCase(_T("ISO")) == 0) {
-      // make sure it's represented in the standard form: ISO_8859-1
-      codeset = _T("ISO_");
-      charset += 3;
-      if ((*charset == _T('-')) || (*charset == _T('_'))) charset++;
-      if (wxStrlen(charset)>4) {
-        if (wxString(charset,4) == _T("8859")) {
-          codeset << _T("8859-");
-          if (*charset == _T('-')) charset++;
-        }
-      }
-    }
-    codeset << charset;
-    codeset.MakeUpper();
-    m_name = wxStrdup(codeset.c_str());
+    m_name = wxStrdup(charset);
     m_deferred = TRUE;
-#endif
   }
 }
 
 void wxCSConv::LoadNow()
 {
-//  wxPrintf(_T("Conversion request\n"));
+//  wxPrintf(wxT("Conversion request\n"));
   if (m_deferred) {
     if (!m_name) {
 #ifdef __UNIX__
-      wxChar *lang = wxGetenv(_T("LANG"));
-      wxChar *dot = lang ? wxStrchr(lang, _T('.')) : (wxChar *)NULL;
-      if (dot) SetName(dot+1);
+#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 = wxFindCharacterSet(m_name);
+    m_cset = wxGetCharacterSet(m_name);
     m_deferred = FALSE;
   }
 }
@@ -423,41 +617,80 @@ void wxCSConv::LoadNow()
 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) {
-    if (m_cset) {
-      for (size_t c=0; c<n; c++)
-        buf[c] = m_cset->data[(unsigned char)(psz[c])];
-    } else {
-      // latin-1 (direct)
-      for (size_t c=0; c<n; c++)
-        buf[c] = (unsigned char)(psz[c]);
-    }
-    return n;
+    for (size_t c=0; c<=len; c++)
+      buf[c] = (unsigned char)(psz[c]);
   }
-  return strlen(psz);
+  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) {
-    if (m_cset) {
-      for (size_t c=0; c<n; c++) {
-        size_t n;
-        for (n=0; (n<256) && (m_cset->data[n] != psz[c]); n++);
-        buf[c] = (n>0xff) ? '?' : n;
-      }
-    } else {
-      // latin-1 (direct)
-      for (size_t c=0; c<n; c++)
-        buf[c] = (psz[c]>0xff) ? '?' : psz[c];
-    }
-    return n;
+    for (size_t c=0; c<=len; c++)
+      buf[c] = (psz[c]>0xff) ? '?' : psz[c];
   }
-  return wcslen(psz);
+  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
-  //wxUSE_WCHAR_T
+
+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