X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/483b0434bfa1b10d2522ac0affe8758e629c21ee..77a1771911ed222ba6861ead327c3735fc16a0b1:/src/common/strconv.cpp?ds=sidebyside

diff --git a/src/common/strconv.cpp b/src/common/strconv.cpp
index f610bf76e0..f4a58755c3 100644
--- a/src/common/strconv.cpp
+++ b/src/common/strconv.cpp
@@ -12,25 +12,14 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-// ============================================================================
-// declarations
-// ============================================================================
-
-// ----------------------------------------------------------------------------
-// headers
-// ----------------------------------------------------------------------------
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
-#ifdef __BORLANDC__
-  #pragma hdrstop
-#endif
-
 #ifndef WX_PRECOMP
     #include "wx/intl.h"
     #include "wx/log.h"
-#endif // WX_PRECOMP
+    #include "wx/utils.h"
+#endif
 
 #include "wx/strconv.h"
 
@@ -51,7 +40,7 @@
 
 #if defined(__WIN32__) && !defined(__WXMICROWIN__)
     #define wxHAVE_WIN32_MB2WC
-#endif // __WIN32__ but !__WXMICROWIN__
+#endif
 
 #ifdef __SALFORDC__
     #include <clib.h>
@@ -64,7 +53,6 @@
 
 #include "wx/encconv.h"
 #include "wx/fontmap.h"
-#include "wx/utils.h"
 
 #ifdef __WXMAC__
 #ifndef __DARWIN__
@@ -73,15 +61,20 @@
 #include <TextEncodingConverter.h>
 #endif
 
-#include  "wx/mac/private.h"  // includes mac headers
+// includes Mac headers
+#include "wx/mac/private.h"
 #endif
 
+
 #define TRACE_STRCONV _T("strconv")
 
+// WC_UTF16 is defined only if sizeof(wchar_t) == 2, otherwise it's supposed to
+// be 4 bytes
 #if SIZEOF_WCHAR_T == 2
     #define WC_UTF16
 #endif
 
+
 // ============================================================================
 // implementation
 // ============================================================================
@@ -96,44 +89,45 @@ static bool NotAllNULs(const char *p, size_t n)
 }
 
 // ----------------------------------------------------------------------------
-// UTF-16 en/decoding to/from UCS-4
+// UTF-16 en/decoding to/from UCS-4 with surrogates handling
 // ----------------------------------------------------------------------------
 
-
 static size_t encode_utf16(wxUint32 input, wxUint16 *output)
 {
-    if (input<=0xffff)
+    if (input <= 0xffff)
     {
         if (output)
             *output = (wxUint16) input;
+
         return 1;
     }
-    else if (input>=0x110000)
+    else if (input >= 0x110000)
     {
-        return (size_t)-1;
+        return wxCONV_FAILED;
     }
     else
     {
         if (output)
         {
-            *output++ = (wxUint16) ((input >> 10)+0xd7c0);
-            *output = (wxUint16) ((input&0x3ff)+0xdc00);
+            *output++ = (wxUint16) ((input >> 10) + 0xd7c0);
+            *output = (wxUint16) ((input & 0x3ff) + 0xdc00);
         }
+
         return 2;
     }
 }
 
 static size_t decode_utf16(const wxUint16* input, wxUint32& output)
 {
-    if ((*input<0xd800) || (*input>0xdfff))
+    if ((*input < 0xd800) || (*input > 0xdfff))
     {
         output = *input;
         return 1;
     }
-    else if ((input[1]<0xdc00) || (input[1]>0xdfff))
+    else if ((input[1] < 0xdc00) || (input[1] > 0xdfff))
     {
         output = *input;
-        return (size_t)-1;
+        return wxCONV_FAILED;
     }
     else
     {
@@ -142,6 +136,29 @@ static size_t decode_utf16(const wxUint16* input, wxUint32& output)
     }
 }
 
+#ifdef WC_UTF16
+    typedef wchar_t wxDecodeSurrogate_t;
+#else // !WC_UTF16
+    typedef wxUint16 wxDecodeSurrogate_t;
+#endif // WC_UTF16/!WC_UTF16
+
+// returns the next UTF-32 character from the wchar_t buffer and advances the
+// pointer to the character after this one
+//
+// if an invalid character is found, *pSrc is set to NULL, the caller must
+// check for this
+static wxUint32 wxDecodeSurrogate(const wxDecodeSurrogate_t **pSrc)
+{
+    wxUint32 out;
+    const size_t
+        n = decode_utf16(wx_reinterpret_cast(const wxUint16 *, *pSrc), out);
+    if ( n == wxCONV_FAILED )
+        *pSrc = NULL;
+    else
+        *pSrc += n;
+
+    return out;
+}
 
 // ----------------------------------------------------------------------------
 // wxMBConv
@@ -162,7 +179,7 @@ wxMBConv::ToWChar(wchar_t *dst, size_t dstLen,
     size_t dstWritten = 0;
 
     // the number of NULs terminating this string
-    size_t nulLen wxDUMMY_INITIALIZE(0);
+    size_t nulLen = 0;  // not really needed, but just to avoid warnings
 
     // if we were not given the input size we just have to assume that the
     // string is properly terminated as we have no way of knowing how long it
@@ -170,7 +187,7 @@ wxMBConv::ToWChar(wchar_t *dst, size_t dstLen,
     // NULs at the end
     wxCharBuffer bufTmp;
     const char *srcEnd;
-    if ( srcLen != (size_t)-1 )
+    if ( srcLen != wxNO_LEN )
     {
         // we need to know how to find the end of this string
         nulLen = GetMBNulLen();
@@ -201,33 +218,25 @@ wxMBConv::ToWChar(wchar_t *dst, size_t dstLen,
     {
         // try to convert the current chunk
         size_t lenChunk = MB2WC(NULL, src, 0);
-        if ( lenChunk == 0 )
-        {
-            // nothing left in the input string, conversion succeeded
-            break;
-        }
-
         if ( lenChunk == wxCONV_FAILED )
             return wxCONV_FAILED;
 
-        // if we already have a previous chunk, leave the NUL separating it
-        // from this one
-        if ( dstWritten )
-        {
-            dstWritten++;
-            if ( dst )
-                dst++;
-        }
+        lenChunk++; // for the L'\0' at the end of this chunk
 
         dstWritten += lenChunk;
 
+        if ( lenChunk == 1 )
+        {
+            // nothing left in the input string, conversion succeeded
+            break;
+        }
+
         if ( dst )
         {
             if ( dstWritten > dstLen )
                 return wxCONV_FAILED;
 
-            lenChunk = MB2WC(dst, src, lenChunk + 1 /* for NUL */);
-            if ( lenChunk == wxCONV_FAILED )
+            if ( MB2WC(dst, src, lenChunk) == wxCONV_FAILED )
                 return wxCONV_FAILED;
 
             dst += lenChunk;
@@ -235,8 +244,8 @@ wxMBConv::ToWChar(wchar_t *dst, size_t dstLen,
 
         if ( !srcEnd )
         {
-            // we convert the entire string in this cas, as we suppose that the
-            // string is NUL-terminated and so srcEnd is not used at all
+            // we convert just one chunk in this case as this is the entire
+            // string anyhow
             break;
         }
 
@@ -275,7 +284,7 @@ wxMBConv::FromWChar(char *dst, size_t dstLen,
     // if we don't know its length we have no choice but to assume that it is,
     // indeed, properly terminated
     wxWCharBuffer bufTmp;
-    if ( srcLen == (size_t)-1 )
+    if ( srcLen == wxNO_LEN )
     {
         srcLen = wxWcslen(src) + 1;
     }
@@ -283,7 +292,7 @@ wxMBConv::FromWChar(char *dst, size_t dstLen,
     {
         // make a copy in order to properly NUL-terminate the string
         bufTmp = wxWCharBuffer(srcLen);
-        memcpy(bufTmp.data(), src, srcLen*sizeof(wchar_t));
+        memcpy(bufTmp.data(), src, srcLen * sizeof(wchar_t));
         src = bufTmp;
     }
 
@@ -316,6 +325,30 @@ wxMBConv::FromWChar(char *dst, size_t dstLen,
     return dstWritten;
 }
 
+size_t wxMBConv::MB2WC(wchar_t *outBuff, const char *inBuff, size_t outLen) const
+{
+    size_t rc = ToWChar(outBuff, outLen, inBuff);
+    if ( rc != wxCONV_FAILED )
+    {
+        // ToWChar() returns the buffer length, i.e. including the trailing
+        // NUL, while this method doesn't take it into account
+        rc--;
+    }
+
+    return rc;
+}
+
+size_t wxMBConv::WC2MB(char *outBuff, const wchar_t *inBuff, size_t outLen) const
+{
+    size_t rc = FromWChar(outBuff, outLen, inBuff);
+    if ( rc != wxCONV_FAILED )
+    {
+        rc -= GetMBNulLen();
+    }
+
+    return rc;
+}
+
 wxMBConv::~wxMBConv()
 {
     // nothing to do here (necessary for Darwin linking probably)
@@ -361,16 +394,21 @@ const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *pwz) const
 }
 
 const wxWCharBuffer
-wxMBConv::cMB2WC(const char *in, size_t inLen, size_t *outLen) const
+wxMBConv::cMB2WC(const char *inBuff, size_t inLen, size_t *outLen) const
 {
-    const size_t dstLen = ToWChar(NULL, 0, in, inLen);
+    const size_t dstLen = ToWChar(NULL, 0, inBuff, inLen);
     if ( dstLen != wxCONV_FAILED )
     {
-        wxWCharBuffer wbuf(dstLen);
-        if ( ToWChar(wbuf.data(), dstLen, in, inLen) )
+        wxWCharBuffer wbuf(dstLen - 1);
+        if ( ToWChar(wbuf.data(), dstLen, inBuff, inLen) != wxCONV_FAILED )
         {
             if ( outLen )
+            {
                 *outLen = dstLen;
+                if ( wbuf[dstLen - 1] == L'\0' )
+                    (*outLen)--;
+            }
+
             return wbuf;
         }
     }
@@ -382,16 +420,30 @@ wxMBConv::cMB2WC(const char *in, size_t inLen, size_t *outLen) const
 }
 
 const wxCharBuffer
-wxMBConv::cWC2MB(const wchar_t *in, size_t inLen, size_t *outLen) const
+wxMBConv::cWC2MB(const wchar_t *inBuff, size_t inLen, size_t *outLen) const
 {
-    const size_t dstLen = FromWChar(NULL, 0, in, inLen);
+    size_t dstLen = FromWChar(NULL, 0, inBuff, inLen);
     if ( dstLen != wxCONV_FAILED )
     {
-        wxCharBuffer buf(dstLen);
-        if ( FromWChar(buf.data(), dstLen, in, inLen) )
+        // special case of empty input: can't allocate 0 size buffer below as
+        // wxCharBuffer insists on NUL-terminating it
+        wxCharBuffer buf(dstLen ? dstLen - 1 : 1);
+        if ( FromWChar(buf.data(), dstLen, inBuff, inLen) != wxCONV_FAILED )
         {
             if ( outLen )
+            {
                 *outLen = dstLen;
+
+                const size_t nulLen = GetMBNulLen();
+                if ( dstLen >= nulLen &&
+                        !NotAllNULs(buf.data() + dstLen - nulLen, nulLen) )
+                {
+                    // in this case the output is NUL-terminated and we're not
+                    // supposed to count NUL
+                    *outLen -= nulLen;
+                }
+            }
+
             return buf;
         }
     }
@@ -532,7 +584,7 @@ size_t wxMBConvUTF7::MB2WC(wchar_t *buf, const char *psz, size_t n) const
             if ( !ok )
             {
                 // in valid UTF7 we should have valid characters after '+'
-                return (size_t)-1;
+                return wxCONV_FAILED;
             }
 
             if (*psz == '-')
@@ -593,19 +645,21 @@ size_t wxMBConvUTF7::WC2MB(char *buf, const wchar_t *psz, size_t n) const
             // plain ASCII char
             if (buf)
                 *buf++ = (char)cc;
+
             len++;
         }
 #ifndef WC_UTF16
         else if (((wxUint32)cc) > 0xffff)
         {
             // no surrogate pair generation (yet?)
-            return (size_t)-1;
+            return wxCONV_FAILED;
         }
 #endif
         else
         {
             if (buf)
                 *buf++ = '+';
+
             len++;
             if (cc != '+')
             {
@@ -626,24 +680,30 @@ size_t wxMBConvUTF7::WC2MB(char *buf, const wchar_t *psz, size_t n) const
                             len++;
                         }
                     }
+
                     cc = *psz;
                     if (!(cc) || (cc < 0x80 && utf7encode[cc] < 1))
                         break;
                 }
+
                 if (l != 0)
                 {
                     if (buf)
                         *buf++ = utf7enb64[((d % 16) << (6 - l)) % 64];
+
                     len++;
                 }
             }
+
             if (buf)
                 *buf++ = '-';
             len++;
         }
     }
+
     if (buf && (len < n))
         *buf = 0;
+
     return len;
 }
 
@@ -671,6 +731,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
         unsigned cnt;
         for (cnt = 0; fc & 0x80; cnt++)
             fc <<= 1;
+
         if (!cnt)
         {
             // plain ASCII char
@@ -708,9 +769,11 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
                         invalid = true;
                         break;
                     }
+
                     psz++;
                     res = (res << 6) | (cc & 0x3f);
                 }
+
                 if (invalid || res <= utf8_max[ocnt])
                 {
                     // illegal UTF-8 encoding
@@ -729,7 +792,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 #ifdef WC_UTF16
                     // cast is ok because wchar_t == wxUuint16 if WC_UTF16
                     size_t pa = encode_utf16(res, (wxUint16 *)buf);
-                    if (pa == (size_t)-1)
+                    if (pa == wxCONV_FAILED)
                     {
                         invalid = true;
                     }
@@ -746,6 +809,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 #endif // WC_UTF16/!WC_UTF16
                 }
             }
+
             if (invalid)
             {
                 if (m_options & MAP_INVALID_UTF8_TO_PUA)
@@ -755,7 +819,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 #ifdef WC_UTF16
                         // cast is ok because wchar_t == wxUuint16 if WC_UTF16
                         size_t pa = encode_utf16((unsigned char)*opsz + wxUnicodePUA, (wxUint16 *)buf);
-                        wxASSERT(pa != (size_t)-1);
+                        wxASSERT(pa != wxCONV_FAILED);
                         if (buf)
                             buf += pa;
                         opsz++;
@@ -780,19 +844,22 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
                             *buf++ = (wchar_t)( L'0' + (on % 0100) / 010 );
                             *buf++ = (wchar_t)( L'0' + on % 010 );
                         }
+
                         opsz++;
                         len += 4;
                     }
                 }
                 else // MAP_INVALID_UTF8_NOT
                 {
-                    return (size_t)-1;
+                    return wxCONV_FAILED;
                 }
             }
         }
     }
+
     if (buf && (len < n))
         *buf = 0;
+
     return len;
 }
 
@@ -808,12 +875,13 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     while (*psz && ((!buf) || (len < n)))
     {
         wxUint32 cc;
+
 #ifdef WC_UTF16
         // cast is ok for WC_UTF16
         size_t pa = decode_utf16((const wxUint16 *)psz, cc);
-        psz += (pa == (size_t)-1) ? 1 : pa;
+        psz += (pa == wxCONV_FAILED) ? 1 : pa;
 #else
-        cc=(*psz++) & 0x7fffffff;
+        cc = (*psz++) & 0x7fffffff;
 #endif
 
         if ( (m_options & MAP_INVALID_UTF8_TO_PUA)
@@ -837,8 +905,8 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         {
             if (buf)
             {
-                *buf++ = (char) ((psz[0] - L'0')*0100 +
-                                 (psz[1] - L'0')*010 +
+                *buf++ = (char) ((psz[0] - L'0') * 0100 +
+                                 (psz[1] - L'0') * 010 +
                                  (psz[2] - L'0'));
             }
 
@@ -848,7 +916,10 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         else
         {
             unsigned cnt;
-            for (cnt = 0; cc > utf8_max[cnt]; cnt++) {}
+            for (cnt = 0; cc > utf8_max[cnt]; cnt++)
+            {
+            }
+
             if (!cnt)
             {
                 // plain ASCII char
@@ -856,7 +927,6 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
                     *buf++ = (char) cc;
                 len++;
             }
-
             else
             {
                 len += cnt + 1;
@@ -870,15 +940,15 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         }
     }
 
-    if (buf && (len<n))
+    if (buf && (len < n))
         *buf = 0;
 
     return len;
 }
 
-// ----------------------------------------------------------------------------
+// ============================================================================
 // UTF-16
-// ----------------------------------------------------------------------------
+// ============================================================================
 
 #ifdef WORDS_BIGENDIAN
     #define wxMBConvUTF16straight wxMBConvUTF16BE
@@ -888,463 +958,589 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     #define wxMBConvUTF16straight wxMBConvUTF16LE
 #endif
 
+/* static */
+size_t wxMBConvUTF16Base::GetLength(const char *src, size_t srcLen)
+{
+    if ( srcLen == wxNO_LEN )
+    {
+        // count the number of bytes in input, including the trailing NULs
+        const wxUint16 *inBuff = wx_reinterpret_cast(const wxUint16 *, src);
+        for ( srcLen = 1; *inBuff++; srcLen++ )
+            ;
 
+        srcLen *= BYTES_PER_CHAR;
+    }
+    else // we already have the length
+    {
+        // we can only convert an entire number of UTF-16 characters
+        if ( srcLen % BYTES_PER_CHAR )
+            return wxCONV_FAILED;
+    }
+
+    return srcLen;
+}
+
+// case when in-memory representation is UTF-16 too
 #ifdef WC_UTF16
 
-// copy 16bit MB to 16bit String
-size_t wxMBConvUTF16straight::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+// ----------------------------------------------------------------------------
+// conversions without endianness change
+// ----------------------------------------------------------------------------
+
+size_t
+wxMBConvUTF16straight::ToWChar(wchar_t *dst, size_t dstLen,
+                               const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    // set up the scene for using memcpy() (which is presumably more efficient
+    // than copying the bytes one by one)
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint16*)psz && (!buf || len < n))
+    const size_t inLen = srcLen / BYTES_PER_CHAR;
+    if ( dst )
     {
-        if (buf)
-            *buf++ = *(wxUint16*)psz;
-        len++;
+        if ( dstLen < inLen )
+            return wxCONV_FAILED;
 
-        psz += sizeof(wxUint16);
+        memcpy(dst, src, srcLen);
     }
-    if (buf && len<n)   *buf=0;
 
-    return len;
+    return inLen;
 }
 
-
-// copy 16bit String to 16bit MB
-size_t wxMBConvUTF16straight::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF16straight::FromWChar(char *dst, size_t dstLen,
+                                 const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    srcLen *= BYTES_PER_CHAR;
+
+    if ( dst )
     {
-        if (buf)
-        {
-            *(wxUint16*)buf = *psz;
-            buf += sizeof(wxUint16);
-        }
-        len += sizeof(wxUint16);
-        psz++;
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
+
+        memcpy(dst, src, srcLen);
     }
-    if (buf && len<=n-sizeof(wxUint16))   *(wxUint16*)buf=0;
 
-    return len;
+    return srcLen;
 }
 
+// ----------------------------------------------------------------------------
+// endian-reversing conversions
+// ----------------------------------------------------------------------------
 
-// swap 16bit MB to 16bit String
-size_t wxMBConvUTF16swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF16swap::ToWChar(wchar_t *dst, size_t dstLen,
+                           const char *src, size_t srcLen) const
 {
-    size_t len = 0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
+
+    srcLen /= BYTES_PER_CHAR;
 
-    // UTF16 string must be terminated by 2 NULs as single NULs may occur
-    // inside the string
-    while ( (psz[0] || psz[1]) && (!buf || len < n) )
+    if ( dst )
     {
-        if ( buf )
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
+
+        const wxUint16 *inBuff = wx_reinterpret_cast(const wxUint16 *, src);
+        for ( size_t n = 0; n < srcLen; n++, inBuff++ )
         {
-            ((char *)buf)[0] = psz[1];
-            ((char *)buf)[1] = psz[0];
-            buf++;
+            *dst++ = wxUINT16_SWAP_ALWAYS(*inBuff);
         }
-        len++;
-        psz += 2;
     }
 
-    if ( buf && len < n )
-        *buf = L'\0';
-
-    return len;
+    return srcLen;
 }
 
-
-// swap 16bit MB to 16bit String
-size_t wxMBConvUTF16swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF16swap::FromWChar(char *dst, size_t dstLen,
+                             const wchar_t *src, size_t srcLen) const
 {
-    size_t len = 0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while ( *psz && (!buf || len < n) )
+    srcLen *= BYTES_PER_CHAR;
+
+    if ( dst )
     {
-        if ( buf )
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
+
+        wxUint16 *outBuff = wx_reinterpret_cast(wxUint16 *, dst);
+        for ( size_t n = 0; n < srcLen; n += BYTES_PER_CHAR, src++ )
         {
-            *buf++ = ((char*)psz)[1];
-            *buf++ = ((char*)psz)[0];
+            *outBuff++ = wxUINT16_SWAP_ALWAYS(*src);
         }
-        len += 2;
-        psz++;
     }
 
-    if ( buf && len < n )
-        *buf = '\0';
-
-    return len;
+    return srcLen;
 }
 
+#else // !WC_UTF16: wchar_t is UTF-32
 
-#else // WC_UTF16
-
+// ----------------------------------------------------------------------------
+// conversions without endianness change
+// ----------------------------------------------------------------------------
 
-// copy 16bit MB to 32bit String
-size_t wxMBConvUTF16straight::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF16straight::ToWChar(wchar_t *dst, size_t dstLen,
+                               const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint16*)psz && (!buf || len < n))
+    const size_t inLen = srcLen / BYTES_PER_CHAR;
+    if ( !dst )
     {
-        wxUint32 cc;
-        size_t pa=decode_utf16((wxUint16*)psz, cc);
-        if (pa == (size_t)-1)
-            return pa;
+        // optimization: return maximal space which could be needed for this
+        // string even if the real size could be smaller if the buffer contains
+        // any surrogates
+        return inLen;
+    }
 
-        if (buf)
-            *buf++ = (wchar_t)cc;
-        len++;
-        psz += pa * sizeof(wxUint16);
+    size_t outLen = 0;
+    const wxUint16 *inBuff = wx_reinterpret_cast(const wxUint16 *, src);
+    for ( const wxUint16 * const inEnd = inBuff + inLen; inBuff < inEnd; )
+    {
+        const wxUint32 ch = wxDecodeSurrogate(&inBuff);
+        if ( !inBuff )
+            return wxCONV_FAILED;
+
+        if ( ++outLen > dstLen )
+            return wxCONV_FAILED;
+
+        *dst++ = ch;
     }
-    if (buf && len<n)   *buf=0;
 
-    return len;
-}
 
+    return outLen;
+}
 
-// copy 32bit String to 16bit MB
-size_t wxMBConvUTF16straight::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF16straight::FromWChar(char *dst, size_t dstLen,
+                                 const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    size_t outLen = 0;
+    wxUint16 *outBuff = wx_reinterpret_cast(wxUint16 *, dst);
+    for ( size_t n = 0; n < srcLen; n++ )
     {
         wxUint16 cc[2];
-        size_t pa=encode_utf16(*psz, cc);
-
-        if (pa == (size_t)-1)
-            return pa;
+        const size_t numChars = encode_utf16(*src++, cc);
+        if ( numChars == wxCONV_FAILED )
+            return wxCONV_FAILED;
 
-        if (buf)
+        outLen += numChars * BYTES_PER_CHAR;
+        if ( outBuff )
         {
-            *(wxUint16*)buf = cc[0];
-            buf += sizeof(wxUint16);
-            if (pa > 1)
+            if ( outLen > dstLen )
+                return wxCONV_FAILED;
+
+            *outBuff++ = cc[0];
+            if ( numChars == 2 )
             {
-                *(wxUint16*)buf = cc[1];
-                buf += sizeof(wxUint16);
+                // second character of a surrogate
+                *outBuff++ = cc[1];
             }
         }
-
-        len += pa*sizeof(wxUint16);
-        psz++;
     }
-    if (buf && len<=n-sizeof(wxUint16))   *(wxUint16*)buf=0;
 
-    return len;
+    return outLen;
 }
 
+// ----------------------------------------------------------------------------
+// endian-reversing conversions
+// ----------------------------------------------------------------------------
 
-// swap 16bit MB to 32bit String
-size_t wxMBConvUTF16swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF16swap::ToWChar(wchar_t *dst, size_t dstLen,
+                           const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint16*)psz && (!buf || len < n))
+    const size_t inLen = srcLen / BYTES_PER_CHAR;
+    if ( !dst )
     {
-        wxUint32 cc;
-        char tmp[4];
-        tmp[0]=psz[1];  tmp[1]=psz[0];
-        tmp[2]=psz[3];  tmp[3]=psz[2];
+        // optimization: return maximal space which could be needed for this
+        // string even if the real size could be smaller if the buffer contains
+        // any surrogates
+        return inLen;
+    }
 
-        size_t pa=decode_utf16((wxUint16*)tmp, cc);
-        if (pa == (size_t)-1)
-            return pa;
+    size_t outLen = 0;
+    const wxUint16 *inBuff = wx_reinterpret_cast(const wxUint16 *, src);
+    for ( const wxUint16 * const inEnd = inBuff + inLen; inBuff < inEnd; )
+    {
+        wxUint32 ch;
+        wxUint16 tmp[2];
 
-        if (buf)
-            *buf++ = (wchar_t)cc;
+        tmp[0] = wxUINT16_SWAP_ALWAYS(*inBuff);
+        inBuff++;
+        tmp[1] = wxUINT16_SWAP_ALWAYS(*inBuff);
+
+        const size_t numChars = decode_utf16(tmp, ch);
+        if ( numChars == wxCONV_FAILED )
+            return wxCONV_FAILED;
 
-        len++;
-        psz += pa * sizeof(wxUint16);
+        if ( numChars == 2 )
+            inBuff++;
+
+        if ( ++outLen > dstLen )
+            return wxCONV_FAILED;
+
+        *dst++ = ch;
     }
-    if (buf && len<n)   *buf=0;
 
-    return len;
-}
 
+    return outLen;
+}
 
-// swap 32bit String to 16bit MB
-size_t wxMBConvUTF16swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF16swap::FromWChar(char *dst, size_t dstLen,
+                             const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    size_t outLen = 0;
+    wxUint16 *outBuff = wx_reinterpret_cast(wxUint16 *, dst);
+    for ( const wchar_t *srcEnd = src + srcLen; src < srcEnd; src++ )
     {
         wxUint16 cc[2];
-        size_t pa=encode_utf16(*psz, cc);
-
-        if (pa == (size_t)-1)
-            return pa;
+        const size_t numChars = encode_utf16(*src, cc);
+        if ( numChars == wxCONV_FAILED )
+            return wxCONV_FAILED;
 
-        if (buf)
+        outLen += numChars * BYTES_PER_CHAR;
+        if ( outBuff )
         {
-            *buf++ = ((char*)cc)[1];
-            *buf++ = ((char*)cc)[0];
-            if (pa > 1)
+            if ( outLen > dstLen )
+                return wxCONV_FAILED;
+
+            *outBuff++ = wxUINT16_SWAP_ALWAYS(cc[0]);
+            if ( numChars == 2 )
             {
-                *buf++ = ((char*)cc)[3];
-                *buf++ = ((char*)cc)[2];
+                // second character of a surrogate
+                *outBuff++ = wxUINT16_SWAP_ALWAYS(cc[1]);
             }
         }
-
-        len += pa*sizeof(wxUint16);
-        psz++;
     }
-    if (buf && len<=n-sizeof(wxUint16))   *(wxUint16*)buf=0;
 
-    return len;
+    return outLen;
 }
 
-#endif // WC_UTF16
+#endif // WC_UTF16/!WC_UTF16
 
 
-// ----------------------------------------------------------------------------
+// ============================================================================
 // UTF-32
-// ----------------------------------------------------------------------------
+// ============================================================================
 
 #ifdef WORDS_BIGENDIAN
-#define wxMBConvUTF32straight  wxMBConvUTF32BE
-#define wxMBConvUTF32swap      wxMBConvUTF32LE
+    #define wxMBConvUTF32straight  wxMBConvUTF32BE
+    #define wxMBConvUTF32swap      wxMBConvUTF32LE
 #else
-#define wxMBConvUTF32swap      wxMBConvUTF32BE
-#define wxMBConvUTF32straight  wxMBConvUTF32LE
+    #define wxMBConvUTF32swap      wxMBConvUTF32BE
+    #define wxMBConvUTF32straight  wxMBConvUTF32LE
 #endif
 
 
 WXDLLIMPEXP_DATA_BASE(wxMBConvUTF32LE) wxConvUTF32LE;
 WXDLLIMPEXP_DATA_BASE(wxMBConvUTF32BE) wxConvUTF32BE;
 
+/* static */
+size_t wxMBConvUTF32Base::GetLength(const char *src, size_t srcLen)
+{
+    if ( srcLen == wxNO_LEN )
+    {
+        // count the number of bytes in input, including the trailing NULs
+        const wxUint32 *inBuff = wx_reinterpret_cast(const wxUint32 *, src);
+        for ( srcLen = 1; *inBuff++; srcLen++ )
+            ;
+
+        srcLen *= BYTES_PER_CHAR;
+    }
+    else // we already have the length
+    {
+        // we can only convert an entire number of UTF-32 characters
+        if ( srcLen % BYTES_PER_CHAR )
+            return wxCONV_FAILED;
+    }
+
+    return srcLen;
+}
 
+// case when in-memory representation is UTF-16
 #ifdef WC_UTF16
 
-// copy 32bit MB to 16bit String
-size_t wxMBConvUTF32straight::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+// ----------------------------------------------------------------------------
+// conversions without endianness change
+// ----------------------------------------------------------------------------
+
+size_t
+wxMBConvUTF32straight::ToWChar(wchar_t *dst, size_t dstLen,
+                               const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint32*)psz && (!buf || len < n))
+    const wxUint32 *inBuff = wx_reinterpret_cast(const wxUint32 *, src);
+    const size_t inLen = srcLen / BYTES_PER_CHAR;
+    size_t outLen = 0;
+    for ( size_t n = 0; n < inLen; n++ )
     {
         wxUint16 cc[2];
+        const size_t numChars = encode_utf16(*inBuff++, cc);
+        if ( numChars == wxCONV_FAILED )
+            return wxCONV_FAILED;
 
-        size_t pa=encode_utf16(*(wxUint32*)psz, cc);
-        if (pa == (size_t)-1)
-            return pa;
-
-        if (buf)
+        outLen += numChars;
+        if ( dst )
         {
-            *buf++ = cc[0];
-            if (pa > 1)
-                *buf++ = cc[1];
+            if ( outLen > dstLen )
+                return wxCONV_FAILED;
+
+            *dst++ = cc[0];
+            if ( numChars == 2 )
+            {
+                // second character of a surrogate
+                *dst++ = cc[1];
+            }
         }
-        len += pa;
-        psz += sizeof(wxUint32);
     }
-    if (buf && len<n)   *buf=0;
 
-    return len;
+    return outLen;
 }
 
-
-// copy 16bit String to 32bit MB
-size_t wxMBConvUTF32straight::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF32straight::FromWChar(char *dst, size_t dstLen,
+                                 const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    if ( !dst )
     {
-        wxUint32 cc;
+        // optimization: return maximal space which could be needed for this
+        // string instead of the exact amount which could be less if there are
+        // any surrogates in the input
+        //
+        // we consider that surrogates are rare enough to make it worthwhile to
+        // avoid running the loop below at the cost of slightly extra memory
+        // consumption
+        return srcLen * BYTES_PER_CHAR;
+    }
 
-        // cast is ok for WC_UTF16
-        size_t pa = decode_utf16((const wxUint16 *)psz, cc);
-        if (pa == (size_t)-1)
-            return pa;
+    wxUint32 *outBuff = wx_reinterpret_cast(wxUint32 *, dst);
+    size_t outLen = 0;
+    for ( const wchar_t * const srcEnd = src + srcLen; src < srcEnd; )
+    {
+        const wxUint32 ch = wxDecodeSurrogate(&src);
+        if ( !src )
+            return wxCONV_FAILED;
 
-        if (buf)
-        {
-            *(wxUint32*)buf = cc;
-            buf += sizeof(wxUint32);
-        }
-        len += sizeof(wxUint32);
-        psz += pa;
-    }
+        outLen += BYTES_PER_CHAR;
 
-    if (buf && len<=n-sizeof(wxUint32))
-        *(wxUint32*)buf=0;
+        if ( outLen > dstLen )
+            return wxCONV_FAILED;
 
-    return len;
-}
+        *outBuff++ = ch;
+    }
 
+    return outLen;
+}
 
+// ----------------------------------------------------------------------------
+// endian-reversing conversions
+// ----------------------------------------------------------------------------
 
-// swap 32bit MB to 16bit String
-size_t wxMBConvUTF32swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF32swap::ToWChar(wchar_t *dst, size_t dstLen,
+                           const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint32*)psz && (!buf || len < n))
+    const wxUint32 *inBuff = wx_reinterpret_cast(const wxUint32 *, src);
+    const size_t inLen = srcLen / BYTES_PER_CHAR;
+    size_t outLen = 0;
+    for ( size_t n = 0; n < inLen; n++, inBuff++ )
     {
-        char tmp[4];
-        tmp[0] = psz[3];   tmp[1] = psz[2];
-        tmp[2] = psz[1];   tmp[3] = psz[0];
-
-
         wxUint16 cc[2];
+        const size_t numChars = encode_utf16(wxUINT32_SWAP_ALWAYS(*inBuff), cc);
+        if ( numChars == wxCONV_FAILED )
+            return wxCONV_FAILED;
 
-        size_t pa=encode_utf16(*(wxUint32*)tmp, cc);
-        if (pa == (size_t)-1)
-            return pa;
-
-        if (buf)
+        outLen += numChars;
+        if ( dst )
         {
-            *buf++ = cc[0];
-            if (pa > 1)
-                *buf++ = cc[1];
+            if ( outLen > dstLen )
+                return wxCONV_FAILED;
+
+            *dst++ = cc[0];
+            if ( numChars == 2 )
+            {
+                // second character of a surrogate
+                *dst++ = cc[1];
+            }
         }
-        len += pa;
-        psz += sizeof(wxUint32);
     }
 
-    if (buf && len<n)
-        *buf=0;
-
-    return len;
+    return outLen;
 }
 
-
-// swap 16bit String to 32bit MB
-size_t wxMBConvUTF32swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF32swap::FromWChar(char *dst, size_t dstLen,
+                             const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    if ( !dst )
     {
-        char cc[4];
+        // optimization: return maximal space which could be needed for this
+        // string instead of the exact amount which could be less if there are
+        // any surrogates in the input
+        //
+        // we consider that surrogates are rare enough to make it worthwhile to
+        // avoid running the loop below at the cost of slightly extra memory
+        // consumption
+        return srcLen*BYTES_PER_CHAR;
+    }
 
-        // cast is ok for WC_UTF16
-        size_t pa=decode_utf16((const wxUint16 *)psz, *(wxUint32*)cc);
-        if (pa == (size_t)-1)
-            return pa;
+    wxUint32 *outBuff = wx_reinterpret_cast(wxUint32 *, dst);
+    size_t outLen = 0;
+    for ( const wchar_t * const srcEnd = src + srcLen; src < srcEnd; )
+    {
+        const wxUint32 ch = wxDecodeSurrogate(&src);
+        if ( !src )
+            return wxCONV_FAILED;
 
-        if (buf)
-        {
-            *buf++ = cc[3];
-            *buf++ = cc[2];
-            *buf++ = cc[1];
-            *buf++ = cc[0];
-        }
-        len += sizeof(wxUint32);
-        psz += pa;
-    }
+        outLen += BYTES_PER_CHAR;
 
-    if (buf && len<=n-sizeof(wxUint32))
-        *(wxUint32*)buf=0;
+        if ( outLen > dstLen )
+            return wxCONV_FAILED;
 
-    return len;
+        *outBuff++ = wxUINT32_SWAP_ALWAYS(ch);
+    }
+
+    return outLen;
 }
 
-#else // WC_UTF16
+#else // !WC_UTF16: wchar_t is UTF-32
 
+// ----------------------------------------------------------------------------
+// conversions without endianness change
+// ----------------------------------------------------------------------------
 
-// copy 32bit MB to 32bit String
-size_t wxMBConvUTF32straight::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF32straight::ToWChar(wchar_t *dst, size_t dstLen,
+                               const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    // use memcpy() as it should be much faster than hand-written loop
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
 
-    while (*(wxUint32*)psz && (!buf || len < n))
+    const size_t inLen = srcLen/BYTES_PER_CHAR;
+    if ( dst )
     {
-        if (buf)
-            *buf++ = (wchar_t)(*(wxUint32*)psz);
-        len++;
-        psz += sizeof(wxUint32);
-    }
+        if ( dstLen < inLen )
+            return wxCONV_FAILED;
 
-    if (buf && len<n)
-        *buf=0;
+        memcpy(dst, src, srcLen);
+    }
 
-    return len;
+    return inLen;
 }
 
-
-// copy 32bit String to 32bit MB
-size_t wxMBConvUTF32straight::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF32straight::FromWChar(char *dst, size_t dstLen,
+                                 const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
 
-    while (*psz && (!buf || len < n))
+    srcLen *= BYTES_PER_CHAR;
+
+    if ( dst )
     {
-        if (buf)
-        {
-            *(wxUint32*)buf = *psz;
-            buf += sizeof(wxUint32);
-        }
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
 
-        len += sizeof(wxUint32);
-        psz++;
+        memcpy(dst, src, srcLen);
     }
 
-    if (buf && len<=n-sizeof(wxUint32))
-        *(wxUint32*)buf=0;
-
-    return len;
+    return srcLen;
 }
 
+// ----------------------------------------------------------------------------
+// endian-reversing conversions
+// ----------------------------------------------------------------------------
 
-// swap 32bit MB to 32bit String
-size_t wxMBConvUTF32swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
+size_t
+wxMBConvUTF32swap::ToWChar(wchar_t *dst, size_t dstLen,
+                           const char *src, size_t srcLen) const
 {
-    size_t len=0;
+    srcLen = GetLength(src, srcLen);
+    if ( srcLen == wxNO_LEN )
+        return wxCONV_FAILED;
+
+    srcLen /= BYTES_PER_CHAR;
 
-    while (*(wxUint32*)psz && (!buf || len < n))
+    if ( dst )
     {
-        if (buf)
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
+
+        const wxUint32 *inBuff = wx_reinterpret_cast(const wxUint32 *, src);
+        for ( size_t n = 0; n < srcLen; n++, inBuff++ )
         {
-            ((char *)buf)[0] = psz[3];
-            ((char *)buf)[1] = psz[2];
-            ((char *)buf)[2] = psz[1];
-            ((char *)buf)[3] = psz[0];
-            buf++;
+            *dst++ = wxUINT32_SWAP_ALWAYS(*inBuff);
         }
-        len++;
-        psz += sizeof(wxUint32);
     }
 
-    if (buf && len<n)
-        *buf=0;
-
-    return len;
+    return srcLen;
 }
 
-
-// swap 32bit String to 32bit MB
-size_t wxMBConvUTF32swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+size_t
+wxMBConvUTF32swap::FromWChar(char *dst, size_t dstLen,
+                             const wchar_t *src, size_t srcLen) const
 {
-    size_t len=0;
+    if ( srcLen == wxNO_LEN )
+        srcLen = wxWcslen(src) + 1;
+
+    srcLen *= BYTES_PER_CHAR;
 
-    while (*psz && (!buf || len < n))
+    if ( dst )
     {
-        if (buf)
+        if ( dstLen < srcLen )
+            return wxCONV_FAILED;
+
+        wxUint32 *outBuff = wx_reinterpret_cast(wxUint32 *, dst);
+        for ( size_t n = 0; n < srcLen; n += BYTES_PER_CHAR, src++ )
         {
-            *buf++ = ((char *)psz)[3];
-            *buf++ = ((char *)psz)[2];
-            *buf++ = ((char *)psz)[1];
-            *buf++ = ((char *)psz)[0];
+            *outBuff++ = wxUINT32_SWAP_ALWAYS(*src);
         }
-        len += sizeof(wxUint32);
-        psz++;
     }
 
-    if (buf && len<=n-sizeof(wxUint32))
-        *(wxUint32*)buf=0;
-
-    return len;
+    return srcLen;
 }
 
-
-#endif // WC_UTF16
+#endif // WC_UTF16/!WC_UTF16
 
 
 // ============================================================================
@@ -1396,18 +1592,25 @@ public:
     virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const;
     virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
 
-    // classify this encoding as explained in wxMBConv::GetMBNulLen()
-    // comment
+    // classify this encoding as explained in wxMBConv::GetMBNulLen() comment
     virtual size_t GetMBNulLen() const;
 
+    virtual wxMBConv *Clone() const
+    {
+        wxMBConv_iconv *p = new wxMBConv_iconv(m_name);
+        p->m_minMBCharWidth = m_minMBCharWidth;
+        return p;
+    }
+
     bool IsOk() const
         { return (m2w != ICONV_T_INVALID) && (w2m != ICONV_T_INVALID); }
 
 protected:
-    // the iconv handlers used to translate from multibyte to wide char and in
-    // the other direction
+    // the iconv handlers used to translate from multibyte
+    // to wide char and in the other direction
     iconv_t m2w,
             w2m;
+
 #if wxUSE_THREADS
     // guards access to m2w and w2m objects
     wxMutex m_iconvMutex;
@@ -1422,6 +1625,10 @@ private:
     // different endian-ness than the native one
     static bool ms_wcNeedsSwap;
 
+
+    // name of the encoding handled by this conversion
+    wxString m_name;
+
     // cached result of GetMBNulLen(); set to 0 meaning "unknown"
     // initially
     size_t m_minMBCharWidth;
@@ -1436,6 +1643,7 @@ WXDLLIMPEXP_BASE wxMBConv* new_wxMBConv_iconv( const wxChar* name )
         delete result;
         return 0;
     }
+
     return result;
 }
 
@@ -1443,6 +1651,7 @@ wxString wxMBConv_iconv::ms_wcCharsetName;
 bool wxMBConv_iconv::ms_wcNeedsSwap = false;
 
 wxMBConv_iconv::wxMBConv_iconv(const wxChar *name)
+              : m_name(name)
 {
     m_minMBCharWidth = 0;
 
@@ -1475,11 +1684,12 @@ wxMBConv_iconv::wxMBConv_iconv(const wxChar *name)
 
             // first try charset with explicit bytesex info (e.g. "UCS-4LE"):
             wxString nameXE(nameCS);
-            #ifdef WORDS_BIGENDIAN
+
+#ifdef WORDS_BIGENDIAN
                 nameXE += _T("BE");
-            #else // little endian
+#else // little endian
                 nameXE += _T("LE");
-            #endif
+#endif
 
             wxLogTrace(TRACE_STRCONV, _T("  trying charset \"%s\""),
                        nameXE.c_str());
@@ -1508,8 +1718,9 @@ wxMBConv_iconv::wxMBConv_iconv(const wxChar *name)
                     wbufPtr = wbuf;
                     bufPtr = buf;
 
-                    res = iconv(m2w, ICONV_CHAR_CAST(&bufPtr), &insz,
-                                (char**)&wbufPtr, &outsz);
+                    res = iconv(
+                        m2w, ICONV_CHAR_CAST(&bufPtr), &insz,
+                        (char**)&wbufPtr, &outsz);
 
                     if (ICONV_FAILED(res, insz))
                     {
@@ -1575,7 +1786,7 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
     switch ( nulLen )
     {
         default:
-            return (size_t)-1;
+            return wxCONV_FAILED;
 
         case 1:
             inbuf = strlen(psz); // arguably more optimized than our version
@@ -1603,7 +1814,6 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
     wxMutexLocker lock(wxConstCast(this, wxMBConv_iconv)->m_iconvMutex);
 #endif // wxUSE_THREADS
 
-
     size_t outbuf = n * SIZEOF_WCHAR_T;
     size_t res, cres;
     // VS: Use these instead of psz, buf because iconv() modifies its arguments:
@@ -1635,23 +1845,26 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
         // to calculate destination buffer requirement
         wchar_t tbuf[8];
         res = 0;
-        do {
+
+        do
+        {
             bufPtr = tbuf;
-            outbuf = 8*SIZEOF_WCHAR_T;
+            outbuf = 8 * SIZEOF_WCHAR_T;
 
             cres = iconv(m2w,
                          ICONV_CHAR_CAST(&pszPtr), &inbuf,
                          (char**)&bufPtr, &outbuf );
 
-            res += 8-(outbuf/SIZEOF_WCHAR_T);
-        } while ((cres==(size_t)-1) && (errno==E2BIG));
+            res += 8 - (outbuf / SIZEOF_WCHAR_T);
+        }
+        while ((cres == (size_t)-1) && (errno == E2BIG));
     }
 
     if (ICONV_FAILED(cres, inbuf))
     {
         //VS: it is ok if iconv fails, hence trace only
         wxLogTrace(TRACE_STRCONV, wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
-        return (size_t)-1;
+        return wxCONV_FAILED;
     }
 
     return res;
@@ -1679,6 +1892,7 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         tmpbuf = (wchar_t *)malloc(inbuf + SIZEOF_WCHAR_T);
         for ( size_t i = 0; i < inlen; i++ )
             tmpbuf[n] = WC_BSWAP(psz[i]);
+
         tmpbuf[inlen] = L'\0';
         psz = tmpbuf;
     }
@@ -1688,7 +1902,7 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         // have destination buffer, convert there
         cres = iconv( w2m, ICONV_CHAR_CAST(&psz), &inbuf, &buf, &outbuf );
 
-        res = n-outbuf;
+        res = n - outbuf;
 
         // NB: iconv was given only wcslen(psz) characters on input, and so
         //     it couldn't convert the trailing zero. Let's do it ourselves
@@ -1698,17 +1912,20 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     }
     else
     {
-        // no destination buffer... convert using temp buffer
+        // no destination buffer: convert using temp buffer
         // to calculate destination buffer requirement
         char tbuf[16];
         res = 0;
-        do {
-            buf = tbuf; outbuf = 16;
+        do
+        {
+            buf = tbuf;
+            outbuf = 16;
 
             cres = iconv( w2m, ICONV_CHAR_CAST(&psz), &inbuf, &buf, &outbuf );
 
             res += 16 - outbuf;
-        } while ((cres==(size_t)-1) && (errno==E2BIG));
+        }
+        while ((cres == (size_t)-1) && (errno == E2BIG));
     }
 
     if (ms_wcNeedsSwap)
@@ -1719,7 +1936,7 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     if (ICONV_FAILED(cres, inbuf))
     {
         wxLogTrace(TRACE_STRCONV, wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
-        return (size_t)-1;
+        return wxCONV_FAILED;
     }
 
     return res;
@@ -1740,15 +1957,15 @@ size_t wxMBConv_iconv::GetMBNulLen() const
         char buf[8]; // should be enough for NUL in any encoding
         size_t inLen = sizeof(wchar_t),
                outLen = WXSIZEOF(buf);
-        char *in = (char *)wnul;
-        char *out = buf;
-        if ( iconv(w2m, ICONV_CHAR_CAST(&in), &inLen, &out, &outLen) == (size_t)-1 )
+        char *inBuff = (char *)wnul;
+        char *outBuff = buf;
+        if ( iconv(w2m, ICONV_CHAR_CAST(&inBuff), &inLen, &outBuff, &outLen) == (size_t)-1 )
         {
             self->m_minMBCharWidth = (size_t)-1;
         }
         else // ok
         {
-            self->m_minMBCharWidth = out - buf;
+            self->m_minMBCharWidth = outBuff - buf;
         }
     }
 
@@ -1779,6 +1996,12 @@ public:
         m_minMBCharWidth = 0;
     }
 
+    wxMBConv_win32(const wxMBConv_win32& conv)
+    {
+        m_CodePage = conv.m_CodePage;
+        m_minMBCharWidth = conv.m_minMBCharWidth;
+    }
+
 #if wxUSE_FONTMAP
     wxMBConv_win32(const wxChar* name)
     {
@@ -1793,7 +2016,7 @@ public:
     }
 #endif // wxUSE_FONTMAP
 
-    size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const
+    virtual size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const
     {
         // note that we have to use MB_ERR_INVALID_CHARS flag as it without it
         // the behaviour is not compatible with the Unix version (using iconv)
@@ -1801,34 +2024,26 @@ public:
         // wouldn't work if reading an incomplete MB char didn't result in an
         // error
         //
-        // note however that using MB_ERR_INVALID_CHARS with CP_UTF7 results in
-        // an error (tested under Windows Server 2003) and apparently it is
-        // done on purpose, i.e. the function accepts any input in this case
-        // and although I'd prefer to return error on ill-formed output, our
-        // own wxMBConvUTF7 doesn't detect errors (e.g. lone "+" which is
-        // explicitly ill-formed according to RFC 2152) neither so we don't
-        // even have any fallback here...
-        //
         // Moreover, MB_ERR_INVALID_CHARS is only supported on Win 2K SP4 or
-        // Win XP or newer and if it is specified on older versions, conversion
-        // from CP_UTF8 (which can have flags only 0 or MB_ERR_INVALID_CHARS)
-        // fails. So we can only use the flag on newer Windows versions.
-        // Additionally, the flag is not supported by UTF7, symbol and CJK
-        // encodings. See here:
+        // Win XP or newer and it is not supported for UTF-[78] so we always
+        // use our own conversions in this case. See
         //     http://blogs.msdn.com/michkap/archive/2005/04/19/409566.aspx
         //     http://msdn.microsoft.com/library/en-us/intl/unicode_17si.asp
-        int flags = 0;
-        if ( m_CodePage != CP_UTF7 && m_CodePage != CP_SYMBOL &&
-             m_CodePage < 50000 &&
-             IsAtLeastWin2kSP4() )
+        if ( m_CodePage == CP_UTF8 )
         {
-            flags = MB_ERR_INVALID_CHARS;
+            return wxConvUTF8.MB2WC(buf, psz, n);
         }
-        else if ( m_CodePage == CP_UTF8 )
+
+        if ( m_CodePage == CP_UTF7 )
         {
-            // Avoid round-trip in the special case of UTF-8 by using our
-            // own UTF-8 conversion code:
-            return wxMBConvUTF8().MB2WC(buf, psz, n);
+            return wxConvUTF7.MB2WC(buf, psz, n);
+        }
+
+        int flags = 0;
+        if ( (m_CodePage < 50000 && m_CodePage != CP_SYMBOL) &&
+                IsAtLeastWin2kSP4() )
+        {
+            flags = MB_ERR_INVALID_CHARS;
         }
 
         const size_t len = ::MultiByteToWideChar
@@ -1843,7 +2058,7 @@ public:
         if ( !len )
         {
             // function totally failed
-            return (size_t)-1;
+            return wxCONV_FAILED;
         }
 
         // if we were really converting and didn't use MB_ERR_INVALID_CHARS,
@@ -1867,7 +2082,7 @@ public:
             {
                 // we didn't obtain the same thing we started from, hence
                 // the conversion was lossy and we consider that it failed
-                return (size_t)-1;
+                return wxCONV_FAILED;
             }
         }
 
@@ -1877,7 +2092,7 @@ public:
         return len - 1;
     }
 
-    size_t WC2MB(char *buf, const wchar_t *pwz, size_t n) const
+    virtual size_t WC2MB(char *buf, const wchar_t *pwz, size_t n) const
     {
         /*
             we have a problem here: by default, WideCharToMultiByte() may
@@ -1928,7 +2143,7 @@ public:
         if ( !len )
         {
             // function totally failed
-            return (size_t)-1;
+            return wxCONV_FAILED;
         }
 
         // if we were really converting, check if we succeeded
@@ -1939,17 +2154,17 @@ public:
                 // check if the conversion failed, i.e. if any replacements
                 // were done
                 if ( usedDef )
-                    return (size_t)-1;
+                    return wxCONV_FAILED;
             }
             else // we must resort to double tripping...
             {
                 wxWCharBuffer wcBuf(n);
-                if ( MB2WC(wcBuf.data(), buf, n) == (size_t)-1 ||
+                if ( MB2WC(wcBuf.data(), buf, n) == wxCONV_FAILED ||
                         wcscmp(wcBuf, pwz) != 0 )
                 {
                     // we didn't obtain the same thing we started from, hence
                     // the conversion was lossy and we consider that it failed
-                    return (size_t)-1;
+                    return wxCONV_FAILED;
                 }
             }
         }
@@ -1979,7 +2194,8 @@ public:
             {
                 default:
                     wxLogDebug(_T("Unexpected NUL length %d"), len);
-                    // fall through
+                    self->m_minMBCharWidth = (size_t)-1;
+                    break;
 
                 case 0:
                     self->m_minMBCharWidth = (size_t)-1;
@@ -1996,6 +2212,8 @@ public:
         return m_minMBCharWidth;
     }
 
+    virtual wxMBConv *Clone() const { return new wxMBConv_win32(*this); }
+
     bool IsOk() const { return m_CodePage != -1; }
 
 private:
@@ -2017,8 +2235,9 @@ private:
                     break;
 
                 default:
-                    // unknown, be conseravtive by default
+                    // unknown: be conservative by default
                     s_isWin98Or2k = 0;
+                    break;
             }
 
             wxASSERT_MSG( s_isWin98Or2k != -1, _T("should be set above") );
@@ -2071,9 +2290,9 @@ private:
 
 #if defined(__WXCOCOA__)
 
-// RN:  There is no UTF-32 support in either Core Foundation or
-// Cocoa.  Strangely enough, internally Core Foundation uses
-// UTF 32 internally quite a bit - its just not public (yet).
+// RN: There is no UTF-32 support in either Core Foundation or Cocoa.
+// Strangely enough, internally Core Foundation uses
+// UTF-32 internally quite a bit - its just not public (yet).
 
 #include <CoreFoundation/CFString.h>
 #include <CoreFoundation/CFStringEncodingExt.h>
@@ -2081,12 +2300,13 @@ private:
 CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
 {
     CFStringEncoding enc = kCFStringEncodingInvalidId ;
-    if ( encoding == wxFONTENCODING_DEFAULT )
-    {
-        enc = CFStringGetSystemEncoding();
-    }
-    else switch( encoding)
+
+    switch (encoding)
     {
+        case wxFONTENCODING_DEFAULT :
+            enc = CFStringGetSystemEncoding();
+            break ;
+
         case wxFONTENCODING_ISO8859_1 :
             enc = kCFStringEncodingISOLatin1 ;
             break ;
@@ -2142,7 +2362,7 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
 //          break ;
 
         case wxFONTENCODING_CP437 :
-            enc =kCFStringEncodingDOSLatinUS ;
+            enc = kCFStringEncodingDOSLatinUS ;
             break ;
         case wxFONTENCODING_CP850 :
             enc = kCFStringEncodingDOSLatin1;
@@ -2154,7 +2374,7 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
             enc = kCFStringEncodingDOSCyrillic;
             break ;
         case wxFONTENCODING_CP866 :
-            enc =kCFStringEncodingDOSRussian ;
+            enc = kCFStringEncodingDOSRussian ;
             break ;
         case wxFONTENCODING_CP874 :
             enc = kCFStringEncodingDOSThai;
@@ -2163,7 +2383,7 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
             enc = kCFStringEncodingDOSJapanese;
             break ;
         case wxFONTENCODING_CP936 :
-            enc =kCFStringEncodingDOSChineseSimplif ;
+            enc = kCFStringEncodingDOSChineseSimplif ;
             break ;
         case wxFONTENCODING_CP949 :
             enc = kCFStringEncodingDOSKorean;
@@ -2175,10 +2395,10 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
             enc = kCFStringEncodingWindowsLatin2;
             break ;
         case wxFONTENCODING_CP1251 :
-            enc =kCFStringEncodingWindowsCyrillic ;
+            enc = kCFStringEncodingWindowsCyrillic ;
             break ;
         case wxFONTENCODING_CP1252 :
-            enc =kCFStringEncodingWindowsLatin1 ;
+            enc = kCFStringEncodingWindowsLatin1 ;
             break ;
         case wxFONTENCODING_CP1253 :
             enc = kCFStringEncodingWindowsGreek;
@@ -2187,10 +2407,10 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
             enc = kCFStringEncodingWindowsLatin5;
             break ;
         case wxFONTENCODING_CP1255 :
-            enc =kCFStringEncodingWindowsHebrew ;
+            enc = kCFStringEncodingWindowsHebrew ;
             break ;
         case wxFONTENCODING_CP1256 :
-            enc =kCFStringEncodingWindowsArabic ;
+            enc = kCFStringEncodingWindowsArabic ;
             break ;
         case wxFONTENCODING_CP1257 :
             enc = kCFStringEncodingWindowsBalticRim;
@@ -2328,10 +2548,12 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
 //      case wxFONTENCODING_MACKEYBOARD :
 //          enc = kCFStringEncodingMacKeyboardGlyphs ;
 //          break ;
+
         default :
             // because gcc is picky
             break ;
-    } ;
+    }
+
     return enc ;
 }
 
@@ -2343,6 +2565,11 @@ public:
         Init(CFStringGetSystemEncoding()) ;
     }
 
+    wxMBConv_cocoa(const wxMBConv_cocoa& conv)
+    {
+        m_encoding = conv.m_encoding;
+    }
+
 #if wxUSE_FONTMAP
     wxMBConv_cocoa(const wxChar* name)
     {
@@ -2396,12 +2623,12 @@ public:
 
         CFRelease(theString);
 
-        szUniCharBuffer[nOutLength] = '\0' ;
+        szUniCharBuffer[nOutLength] = '\0';
 
 #if SIZEOF_WCHAR_T == 4
-        wxMBConvUTF16 converter ;
-        converter.MB2WC(szOut, (const char*)szUniCharBuffer , nOutSize ) ;
-        delete[] szUniCharBuffer;
+        wxMBConvUTF16 converter;
+        converter.MB2WC( szOut, (const char*)szUniCharBuffer, nOutSize );
+        delete [] szUniCharBuffer;
 #endif
 
         return nOutLength;
@@ -2417,9 +2644,9 @@ public:
 
 #if SIZEOF_WCHAR_T == 4
         wxMBConvUTF16 converter ;
-        nBufSize = converter.WC2MB( NULL , szUnConv , 0 );
-        szUniBuffer = new UniChar[ (nBufSize / sizeof(UniChar)) + 1] ;
-        converter.WC2MB( (char*) szUniBuffer , szUnConv, nBufSize + sizeof(UniChar)) ;
+        nBufSize = converter.WC2MB( NULL, szUnConv, 0 );
+        szUniBuffer = new UniChar[ (nBufSize / sizeof(UniChar)) + 1];
+        converter.WC2MB( (char*) szUniBuffer, szUnConv, nBufSize + sizeof(UniChar));
         nBufSize /= sizeof(UniChar);
 #endif
 
@@ -2465,6 +2692,8 @@ public:
         return  nRealOutSize - 1;
     }
 
+    virtual wxMBConv *Clone() const { return new wxMBConv_cocoa(*this); }
+
     bool IsOk() const
     {
         return m_encoding != kCFStringEncodingInvalidId &&
@@ -2491,10 +2720,15 @@ public:
         Init(CFStringGetSystemEncoding()) ;
     }
 
+    wxMBConv_mac(const wxMBConv_mac& conv)
+    {
+        Init(conv.m_char_encoding);
+    }
+
 #if wxUSE_FONTMAP
     wxMBConv_mac(const wxChar* name)
     {
-        Init( wxMacGetSystemEncFromFontEnc(wxFontMapperBase::Get()->CharsetToEncoding(name, false) ) ) ;
+        Init( wxMacGetSystemEncFromFontEnc( wxFontMapperBase::Get()->CharsetToEncoding(name, false) ) );
     }
 #endif
 
@@ -2515,7 +2749,7 @@ public:
     {
         OSStatus status = noErr ;
         m_char_encoding = encoding ;
-        m_unicode_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault,0,kUnicode16BitFormat) ;
+        m_unicode_encoding = CreateTextEncoding(kTextEncodingUnicodeDefault, 0, kUnicode16BitFormat) ;
 
         status = TECCreateConverter(&m_MB2WC_converter,
                                     m_char_encoding,
@@ -2529,35 +2763,41 @@ public:
     {
         OSStatus status = noErr ;
         ByteCount byteOutLen ;
-        ByteCount byteInLen = strlen(psz) ;
+        ByteCount byteInLen = strlen(psz) + 1;
         wchar_t *tbuf = NULL ;
         UniChar* ubuf = NULL ;
         size_t res = 0 ;
 
         if (buf == NULL)
         {
-            //apple specs say at least 32
-            n = wxMax( 32 , byteInLen ) ;
-            tbuf = (wchar_t*) malloc( n * SIZEOF_WCHAR_T) ;
+            // Apple specs say at least 32
+            n = wxMax( 32, byteInLen ) ;
+            tbuf = (wchar_t*) malloc( n * SIZEOF_WCHAR_T ) ;
         }
+
         ByteCount byteBufferLen = n * sizeof( UniChar ) ;
+
 #if SIZEOF_WCHAR_T == 4
         ubuf = (UniChar*) malloc( byteBufferLen + 2 ) ;
 #else
         ubuf = (UniChar*) (buf ? buf : tbuf) ;
 #endif
-        status = TECConvertText(m_MB2WC_converter, (ConstTextPtr) psz , byteInLen, &byteInLen,
-          (TextPtr) ubuf , byteBufferLen, &byteOutLen);
+
+        status = TECConvertText(
+            m_MB2WC_converter, (ConstTextPtr) psz, byteInLen, &byteInLen,
+            (TextPtr) ubuf, byteBufferLen, &byteOutLen);
+
 #if SIZEOF_WCHAR_T == 4
         // we have to terminate here, because n might be larger for the trailing zero, and if UniChar
         // is not properly terminated we get random characters at the end
         ubuf[byteOutLen / sizeof( UniChar ) ] = 0 ;
         wxMBConvUTF16 converter ;
-        res = converter.MB2WC( (buf ? buf : tbuf) , (const char*)ubuf , n ) ;
+        res = converter.MB2WC( (buf ? buf : tbuf), (const char*)ubuf, n ) ;
         free( ubuf ) ;
 #else
         res = byteOutLen / sizeof( UniChar ) ;
 #endif
+
         if ( buf == NULL )
              free(tbuf) ;
 
@@ -2577,27 +2817,32 @@ public:
 
         if (buf == NULL)
         {
-            //apple specs say at least 32
-            n = wxMax( 32 , ((byteInLen / SIZEOF_WCHAR_T) * 8) + SIZEOF_WCHAR_T );
+            // Apple specs say at least 32
+            n = wxMax( 32, ((byteInLen / SIZEOF_WCHAR_T) * 8) + SIZEOF_WCHAR_T );
             tbuf = (char*) malloc( n ) ;
         }
 
         ByteCount byteBufferLen = n ;
         UniChar* ubuf = NULL ;
+
 #if SIZEOF_WCHAR_T == 4
         wxMBConvUTF16 converter ;
-        size_t unicharlen = converter.WC2MB( NULL , psz , 0 ) ;
+        size_t unicharlen = converter.WC2MB( NULL, psz, 0 ) ;
         byteInLen = unicharlen ;
         ubuf = (UniChar*) malloc( byteInLen + 2 ) ;
-        converter.WC2MB( (char*) ubuf , psz, unicharlen + 2 ) ;
+        converter.WC2MB( (char*) ubuf, psz, unicharlen + 2 ) ;
 #else
         ubuf = (UniChar*) psz ;
 #endif
-        status = TECConvertText(m_WC2MB_converter, (ConstTextPtr) ubuf , byteInLen, &byteInLen,
-            (TextPtr) (buf ? buf : tbuf) , byteBufferLen, &byteOutLen);
+
+        status = TECConvertText(
+            m_WC2MB_converter, (ConstTextPtr) ubuf, byteInLen, &byteInLen,
+            (TextPtr) (buf ? buf : tbuf), byteBufferLen, &byteOutLen);
+
 #if SIZEOF_WCHAR_T == 4
         free( ubuf ) ;
 #endif
+
         if ( buf == NULL )
             free(tbuf) ;
 
@@ -2610,28 +2855,30 @@ public:
             //of bogus characters
             wxWCharBuffer wcBuf(n);
             size_t pszlen = wxWcslen(psz);
-            if ( MB2WC(wcBuf.data(), buf, n) == (size_t)-1 ||
+            if ( MB2WC(wcBuf.data(), buf, n) == wxCONV_FAILED ||
                         wxWcslen(wcBuf) != pszlen ||
                         memcmp(wcBuf, psz, pszlen * sizeof(wchar_t)) != 0 )
             {
                 // we didn't obtain the same thing we started from, hence
                 // the conversion was lossy and we consider that it failed
-                return (size_t)-1;
+                return wxCONV_FAILED;
             }
         }
 
         return res ;
     }
 
+    virtual wxMBConv *Clone() const { return new wxMBConv_mac(*this); }
+
     bool IsOk() const
-        { return m_MB2WC_converter !=  NULL && m_WC2MB_converter != NULL  ; }
+        { return m_MB2WC_converter != NULL && m_WC2MB_converter != NULL; }
 
 private:
-    TECObjectRef m_MB2WC_converter ;
-    TECObjectRef m_WC2MB_converter ;
+    TECObjectRef m_MB2WC_converter;
+    TECObjectRef m_WC2MB_converter;
 
-    TextEncodingBase m_char_encoding ;
-    TextEncodingBase m_unicode_encoding ;
+    TextEncodingBase m_char_encoding;
+    TextEncodingBase m_unicode_encoding;
 };
 
 #endif // defined(__WXMAC__) && defined(TARGET_CARBON)
@@ -2676,8 +2923,8 @@ public:
         size_t inbuf = strlen(psz);
         if (buf)
         {
-            if (!m2w.Convert(psz,buf))
-                return (size_t)-1;
+            if (!m2w.Convert(psz, buf))
+                return wxCONV_FAILED;
         }
         return inbuf;
     }
@@ -2687,8 +2934,8 @@ public:
         const size_t inbuf = wxWcslen(psz);
         if (buf)
         {
-            if (!w2m.Convert(psz,buf))
-                return (size_t)-1;
+            if (!w2m.Convert(psz, buf))
+                return wxCONV_FAILED;
         }
 
         return inbuf;
@@ -2711,6 +2958,8 @@ public:
         }
     }
 
+    virtual wxMBConv *Clone() const { return new wxMBConv_wxwin(m_enc); }
+
     bool IsOk() const { return m_ok; }
 
 public:
@@ -2733,6 +2982,7 @@ WXDLLIMPEXP_BASE wxMBConv* new_wxMBConv_wxwin( const wxChar* name )
         delete result;
         return 0;
     }
+
     return result;
 }
 
@@ -2928,13 +3178,13 @@ wxMBConv *wxCSConv::DoCreate() const
 #endif
     }
 #endif // wxHAVE_WIN32_MB2WC
+
 #if defined(__WXMAC__)
     {
         // leave UTF16 and UTF32 to the built-ins of wx
         if ( m_name || ( m_encoding < wxFONTENCODING_UTF16BE ||
             ( m_encoding >= wxFONTENCODING_MACMIN && m_encoding <= wxFONTENCODING_MACMAX ) ) )
         {
-
 #if wxUSE_FONTMAP
             wxMBConv_mac *conv = m_name ? new wxMBConv_mac(m_name)
                                         : new wxMBConv_mac(m_encoding);
@@ -2948,17 +3198,18 @@ wxMBConv *wxCSConv::DoCreate() const
         }
     }
 #endif
+
 #if defined(__WXCOCOA__)
     {
         if ( m_name || ( m_encoding <= wxFONTENCODING_UTF16 ) )
         {
-
 #if wxUSE_FONTMAP
             wxMBConv_cocoa *conv = m_name ? new wxMBConv_cocoa(m_name)
                                           : new wxMBConv_cocoa(m_encoding);
 #else
             wxMBConv_cocoa *conv = new wxMBConv_cocoa(m_encoding);
 #endif
+
             if ( conv->IsOk() )
                  return conv;
 
@@ -3000,7 +3251,7 @@ wxMBConv *wxCSConv::DoCreate() const
 
         default:
              // nothing to do but put here to suppress gcc warnings
-             ;
+             break;
     }
 
     // step (3)
@@ -3035,6 +3286,7 @@ wxMBConv *wxCSConv::DoCreate() const
                          wxString::Format(_("encoding %s"), m_encoding).c_str()
 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
               );
+
         alreadyLoggingError = false;
     }
 
@@ -3094,7 +3346,8 @@ size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         for (size_t c = 0; c <= len; c++)
         {
             if (psz[c] > 0xFF)
-                return (size_t)-1;
+                return wxCONV_FAILED;
+
             buf[c] = (char)psz[c];
         }
     }
@@ -3103,7 +3356,7 @@ size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
         for (size_t c = 0; c <= len; c++)
         {
             if (psz[c] > 0xFF)
-                return (size_t)-1;
+                return wxCONV_FAILED;
         }
     }
 
@@ -3145,6 +3398,7 @@ WXDLLIMPEXP_DATA_BASE(wxCSConv&) wxConvISO8859_1 = wxConvISO8859_1Obj;
 WXDLLIMPEXP_DATA_BASE(wxMBConvUTF7&) wxConvUTF7 = wxConvUTF7Obj;
 WXDLLIMPEXP_DATA_BASE(wxMBConvUTF8&) wxConvUTF8 = wxConvUTF8Obj;
 WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvCurrent = &wxConvLibcObj;
+WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvUI = &wxConvLocal;
 WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvFileName = &
 #ifdef __WXOSX__
                                     wxConvUTF8Obj;
@@ -3152,7 +3406,6 @@ WXDLLIMPEXP_DATA_BASE(wxMBConv *) wxConvFileName = &
                                     wxConvLibcObj;
 #endif
 
-
 #else // !wxUSE_WCHAR_T
 
 // stand-ins in absence of wchar_t