]> git.saurik.com Git - wxWidgets.git/blobdiff - src/common/strconv.cpp
don't crash when loading images with verbose==false (patch 1449823)
[wxWidgets.git] / src / common / strconv.cpp
index 415e05ab752810d3684f8539a1cec16f53aed324..e50eddf3f93b5f796aa7bc6185b2a623229a52e4 100644 (file)
@@ -1,12 +1,14 @@
 /////////////////////////////////////////////////////////////////////////////
-// Name:        strconv.cpp
+// Name:        src/common/strconv.cpp
 // Purpose:     Unicode conversion classes
-// Author:      Ove Kaaven, Robert Roebling, Vadim Zeitlin, Vaclav Slavik
+// Author:      Ove Kaaven, Robert Roebling, Vadim Zeitlin, Vaclav Slavik,
+//              Ryan Norton, Fredrik Roubert (UTF7)
 // Modified by:
 // Created:     29/01/98
 // RCS-ID:      $Id$
 // Copyright:   (c) 1999 Ove Kaaven, Robert Roebling, Vaclav Slavik
 //              (c) 2000-2003 Vadim Zeitlin
+//              (c) 2004 Ryan Norton, Fredrik Roubert
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // headers
 // ----------------------------------------------------------------------------
 
-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-  #pragma implementation "strconv.h"
-#endif
-
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 
 #if wxUSE_WCHAR_T
 
-#ifdef __WXMSW__
-    #include "wx/msw/private.h"
-#endif
-
 #ifdef __WINDOWS__
+    #include "wx/msw/private.h"
     #include "wx/msw/missing.h"
 #endif
 
     #define wxHAVE_WIN32_MB2WC
 #endif // __WIN32__ but !__WXMICROWIN__
 
-// ----------------------------------------------------------------------------
-// headers
-// ----------------------------------------------------------------------------
-
 #ifdef __SALFORDC__
     #include <clib.h>
 #endif
 
 #ifdef HAVE_ICONV
     #include <iconv.h>
+    #include "wx/thread.h"
 #endif
 
 #include "wx/encconv.h"
 #include "wx/utils.h"
 
 #ifdef __WXMAC__
+#ifndef __DARWIN__
 #include <ATSUnicode.h>
 #include <TextCommon.h>
 #include <TextEncodingConverter.h>
+#endif
 
 #include  "wx/mac/private.h"  // includes mac headers
 #endif
-// ----------------------------------------------------------------------------
-// macros
-// ----------------------------------------------------------------------------
 
-#define BSWAP_UCS4(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT32_SWAP_ALWAYS(str[_c]); }
-#define BSWAP_UTF16(str, len) { unsigned _c; for (_c=0; _c<len; _c++) str[_c]=wxUINT16_SWAP_ALWAYS(str[_c]); }
+#define TRACE_STRCONV _T("strconv")
 
-#if SIZEOF_WCHAR_T == 4
-    #define WC_NAME         "UCS4"
-    #define WC_BSWAP         BSWAP_UCS4
-    #ifdef WORDS_BIGENDIAN
-      #define WC_NAME_BEST  "UCS-4BE"
-    #else
-      #define WC_NAME_BEST  "UCS-4LE"
-    #endif
-#elif SIZEOF_WCHAR_T == 2
-    #define WC_NAME         "UTF16"
-    #define WC_BSWAP         BSWAP_UTF16
+#if SIZEOF_WCHAR_T == 2
     #define WC_UTF16
-    #ifdef WORDS_BIGENDIAN
-      #define WC_NAME_BEST  "UTF-16BE"
-    #else
-      #define WC_NAME_BEST  "UTF-16LE"
-    #endif
-#else // sizeof(wchar_t) != 2 nor 4
-    // does this ever happen?
-    #error "Unknown sizeof(wchar_t): please report this to wx-dev@lists.wxwindows.org"
 #endif
 
 // ============================================================================
@@ -149,7 +121,7 @@ static size_t decode_utf16(const wxUint16* input, wxUint32& output)
         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;
@@ -215,6 +187,163 @@ const wxCharBuffer wxMBConv::cWC2MB(const wchar_t *pwz) const
     return buf;
 }
 
+const wxWCharBuffer
+wxMBConv::cMB2WC(const char *in, size_t inLen, size_t *outLen) const
+{
+    // the currently accumulated wide characters
+    wxWCharBuffer wbuf;
+
+    // the current length of wbuf
+    size_t lenBuf = 0;
+
+    // we need to know the representation of L'\0' for this conversion
+    size_t nulLen;
+    const char * const nul = GetMBNul(&nulLen);
+    if ( nulLen == (size_t)-1 || nulLen == 0 )
+        return wxWCharBuffer();
+
+    // make a copy of the input string unless it is already properly
+    // NUL-terminated
+    wxCharBuffer bufTmp;
+
+    // now we can compute the input size if we were not given it: notice that
+    // in this case the string must be properly NUL-terminated, of course, as
+    // otherwise we have no way of knowing how long it is
+    if ( inLen == (size_t)-1 )
+    {
+        // not the most efficient algorithm but it shouldn't matter as normally
+        // there are not many NULs in the string and so normally memcmp()
+        // should stop on the first character
+        const char *p = in;
+        while ( memcmp(p, nul, nulLen) != 0 )
+            p++;
+
+        inLen = p - in + nulLen;
+    }
+    else // we already have the size
+    {
+        // check if it's not already NUL-terminated too to avoid the copy
+        if ( inLen < nulLen || memcmp(in + inLen - nulLen, nul, nulLen) != 0 )
+        {
+            // make a copy in order to properly NUL-terminate the string
+            bufTmp = wxCharBuffer(inLen + nulLen - 1 /* 1 will be added */);
+            memcpy(bufTmp.data(), in, inLen);
+            memcpy(bufTmp.data() + inLen, nul, nulLen);
+        }
+    }
+
+    if ( bufTmp )
+        in = bufTmp;
+
+    for ( const char * const inEnd = in + inLen;; )
+    {
+        // try to convert the current chunk if anything left
+        size_t lenChunk = in < inEnd ? MB2WC(NULL, in, 0) : 0;
+        if ( lenChunk == 0 )
+        {
+            // nothing left in the input string, conversion succeeded
+            if ( outLen )
+            {
+                // we shouldn't include the last NUL in the result length
+                *outLen = lenBuf ? lenBuf - 1 : 0;
+            }
+
+            return wbuf;
+        }
+
+        if ( lenChunk == (size_t)-1 )
+            break;
+
+        const size_t lenBufNew = lenBuf + lenChunk;
+        if ( !wbuf.extend(lenBufNew) )
+            break;
+
+        lenChunk = MB2WC(wbuf.data() + lenBuf, in, lenChunk + 1 /* for NUL */);
+        if ( lenChunk == (size_t)-1 )
+            break;
+
+        // +! for the embedded NUL (if something follows)
+        lenBuf = lenBufNew + 1;
+
+        // advance the input pointer past the end of this chunk
+        while ( memcmp(in, nul, nulLen) != 0 )
+            in++;
+
+        in += nulLen; // skipping over its terminator as well
+    }
+
+    // conversion failed
+    if ( outLen )
+        *outLen = 0;
+
+    return wxWCharBuffer();
+}
+
+const wxCharBuffer
+wxMBConv::cWC2MB(const wchar_t *in, size_t inLen, size_t *outLen) const
+{
+    // the currently accumulated multibyte characters
+    wxCharBuffer buf;
+
+    // the current length of buf
+    size_t lenBuf = 0;
+
+    // make a copy of the input string unless it is already properly
+    // NUL-terminated
+    //
+    // if we don't know its length we have no choice but to assume that it is,
+    // indeed, properly terminated
+    wxWCharBuffer bufTmp;
+    if ( inLen == (size_t)-1 )
+    {
+        inLen = wxWcslen(in) + 1;
+    }
+    else if ( inLen != 0 && in[inLen - 1] != L'\0' )
+    {
+        // make a copy in order to properly NUL-terminate the string
+        bufTmp = wxWCharBuffer(inLen);
+        memcpy(bufTmp.data(), in, inLen*sizeof(wchar_t));
+    }
+
+    if ( bufTmp )
+        in = bufTmp;
+
+    for ( const wchar_t * const inEnd = in + inLen;; )
+    {
+        // try to convert the current chunk, if anything left
+        size_t lenChunk = in < inEnd ? WC2MB(NULL, in, 0) : 0;
+        if ( lenChunk == 0 )
+        {
+            // nothing left in the input string, conversion succeeded
+            if ( outLen )
+                *outLen = lenBuf ? lenBuf - 1 : lenBuf;
+
+            return buf;
+        }
+
+        if ( lenChunk == (size_t)-1 )
+            break;
+
+        const size_t lenBufNew = lenBuf + lenChunk;
+        if ( !buf.extend(lenBufNew) )
+            break;
+
+        lenChunk = WC2MB(buf.data() + lenBuf, in, lenChunk + 1 /* for NUL */);
+        if ( lenChunk == (size_t)-1 )
+            break;
+
+        // chunk successfully converted, go to the next one
+        in += wxWcslen(in) + 1 /* skip NUL too */;
+        lenBuf = lenBufNew + 1;
+    }
+
+    // conversion failed
+    if ( outLen )
+        *outLen = 0;
+
+    return wxCharBuffer();
+}
+
 // ----------------------------------------------------------------------------
 // wxMBConvLibc
 // ----------------------------------------------------------------------------
@@ -229,33 +358,235 @@ size_t wxMBConvLibc::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     return wxWC2MB(buf, psz, n);
 }
 
+// ----------------------------------------------------------------------------
+// wxConvBrokenFileNames
+// ----------------------------------------------------------------------------
+
+#ifdef __UNIX__
+
+wxConvBrokenFileNames::wxConvBrokenFileNames(const wxChar *charset)
+{
+    if ( !charset || wxStricmp(charset, _T("UTF-8")) == 0
+                  || wxStricmp(charset, _T("UTF8")) == 0  )
+        m_conv = new wxMBConvUTF8(wxMBConvUTF8::MAP_INVALID_UTF8_TO_OCTAL);
+    else
+        m_conv = new wxCSConv(charset);
+}
+
+#endif // __UNIX__
+
 // ----------------------------------------------------------------------------
 // UTF-7
 // ----------------------------------------------------------------------------
 
-#if 0
-static char utf7_setD[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                        "abcdefghijklmnopqrstuvwxyz"
-                        "0123456789'(),-./:?";
-static char utf7_setO[]="!\"#$%&*;<=>@[]^_`{|}";
-static char utf7_setB[]="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                        "abcdefghijklmnopqrstuvwxyz"
-                        "0123456789+/";
-#endif
+// Implementation (C) 2004 Fredrik Roubert
+
+//
+// BASE64 decoding table
+//
+static const unsigned char utf7unb64[] =
+{
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f,
+    0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b,
+    0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06,
+    0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e,
+    0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16,
+    0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20,
+    0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
+    0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30,
+    0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+};
 
-// TODO: write actual implementations of UTF-7 here
-size_t wxMBConvUTF7::MB2WC(wchar_t * WXUNUSED(buf),
-                           const char * WXUNUSED(psz),
-                           size_t WXUNUSED(n)) const
+size_t wxMBConvUTF7::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
-  return (size_t)-1;
+    size_t len = 0;
+
+    while ( *psz && (!buf || (len < n)) )
+    {
+        unsigned char cc = *psz++;
+        if (cc != '+')
+        {
+            // plain ASCII char
+            if (buf)
+                *buf++ = cc;
+            len++;
+        }
+        else if (*psz == '-')
+        {
+            // encoded plus sign
+            if (buf)
+                *buf++ = cc;
+            len++;
+            psz++;
+        }
+        else // start of BASE64 encoded string
+        {
+            bool lsb, ok;
+            unsigned int d, l;
+            for ( ok = lsb = false, d = 0, l = 0;
+                  (cc = utf7unb64[(unsigned char)*psz]) != 0xff;
+                  psz++ )
+            {
+                d <<= 6;
+                d += cc;
+                for (l += 6; l >= 8; lsb = !lsb)
+                {
+                    unsigned char c = (unsigned char)((d >> (l -= 8)) % 256);
+                    if (lsb)
+                    {
+                        if (buf)
+                            *buf++ |= c;
+                        len ++;
+                    }
+                    else
+                    {
+                        if (buf)
+                            *buf = (wchar_t)(c << 8);
+                    }
+
+                    ok = true;
+                }
+            }
+
+            if ( !ok )
+            {
+                // in valid UTF7 we should have valid characters after '+'
+                return (size_t)-1;
+            }
+
+            if (*psz == '-')
+                psz++;
+        }
+    }
+
+    if ( buf && (len < n) )
+        *buf = '\0';
+
+    return len;
 }
 
-size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
-                           const wchar_t * WXUNUSED(psz),
-                           size_t WXUNUSED(n)) const
+//
+// BASE64 encoding table
+//
+static const unsigned char utf7enb64[] =
 {
-  return (size_t)-1;
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+    'w', 'x', 'y', 'z', '0', '1', '2', '3',
+    '4', '5', '6', '7', '8', '9', '+', '/'
+};
+
+//
+// UTF-7 encoding table
+//
+// 0 - Set D (directly encoded characters)
+// 1 - Set O (optional direct characters)
+// 2 - whitespace characters (optional)
+// 3 - special characters
+//
+static const unsigned char utf7encode[128] =
+{
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 3, 3, 2, 3, 3,
+    3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
+    2, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 3, 0, 0, 0, 3,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0,
+    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 1, 1, 1,
+    1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 3, 3
+};
+
+size_t wxMBConvUTF7::WC2MB(char *buf, const wchar_t *psz, size_t n) const
+{
+    size_t len = 0;
+
+    while (*psz && ((!buf) || (len < n)))
+    {
+        wchar_t cc = *psz++;
+        if (cc < 0x80 && utf7encode[cc] < 1)
+        {
+            // 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;
+        }
+#endif
+        else
+        {
+            if (buf)
+                *buf++ = '+';
+            len++;
+            if (cc != '+')
+            {
+                // BASE64 encode string
+                unsigned int lsb, d, l;
+                for (d = 0, l = 0; /*nothing*/; psz++)
+                {
+                    for (lsb = 0; lsb < 2; lsb ++)
+                    {
+                        d <<= 8;
+                        d += lsb ? cc & 0xff : (cc & 0xff00) >> 8;
+
+                        for (l += 8; l >= 6; )
+                        {
+                            l -= 6;
+                            if (buf)
+                                *buf++ = utf7enb64[(d >> l) % 64];
+                            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;
 }
 
 // ----------------------------------------------------------------------------
@@ -265,12 +596,19 @@ size_t wxMBConvUTF7::WC2MB(char * WXUNUSED(buf),
 static wxUint32 utf8_max[]=
     { 0x7f, 0x7ff, 0xffff, 0x1fffff, 0x3ffffff, 0x7fffffff, 0xffffffff };
 
+// boundaries of the private use area we use to (temporarily) remap invalid
+// characters invalid in a UTF-8 encoded string
+const wxUint32 wxUnicodePUA = 0x100000;
+const wxUint32 wxUnicodePUAEnd = wxUnicodePUA + 256;
+
 size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
     size_t len = 0;
 
     while (*psz && ((!buf) || (len < n)))
     {
+        const char *opsz = psz;
+        bool invalid = false;
         unsigned char cc = *psz++, fc = cc;
         unsigned cnt;
         for (cnt = 0; fc & 0x80; cnt++)
@@ -281,6 +619,15 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
             if (buf)
                 *buf++ = cc;
             len++;
+
+            // escape the escape character for octal escapes
+            if ((m_options & MAP_INVALID_UTF8_TO_OCTAL)
+                    && cc == '\\' && (!buf || len < n))
+            {
+                if (buf)
+                    *buf++ = cc;
+                len++;
+            }
         }
         else
         {
@@ -288,7 +635,7 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
             if (!cnt)
             {
                 // invalid UTF-8 sequence
-                return (size_t)-1;
+                invalid = true;
             }
             else
             {
@@ -296,32 +643,93 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
                 wxUint32 res = cc & (0x3f >> cnt);
                 while (cnt--)
                 {
-                    cc = *psz++;
+                    cc = *psz;
                     if ((cc & 0xC0) != 0x80)
                     {
                         // invalid UTF-8 sequence
-                        return (size_t)-1;
+                        invalid = true;
+                        break;
                     }
+                    psz++;
                     res = (res << 6) | (cc & 0x3f);
                 }
-                if (res <= utf8_max[ocnt])
+                if (invalid || res <= utf8_max[ocnt])
                 {
                     // illegal UTF-8 encoding
-                    return (size_t)-1;
+                    invalid = true;
                 }
+                else if ((m_options & MAP_INVALID_UTF8_TO_PUA) &&
+                        res >= wxUnicodePUA && res < wxUnicodePUAEnd)
+                {
+                    // if one of our PUA characters turns up externally
+                    // it must also be treated as an illegal sequence
+                    // (a bit like you have to escape an escape character)
+                    invalid = true;
+                }
+                else
+                {
 #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)
-                  return (size_t)-1;
-                if (buf)
-                    buf += pa;
-                len += pa;
+                    // cast is ok because wchar_t == wxUuint16 if WC_UTF16
+                    size_t pa = encode_utf16(res, (wxUint16 *)buf);
+                    if (pa == (size_t)-1)
+                    {
+                        invalid = true;
+                    }
+                    else
+                    {
+                        if (buf)
+                            buf += pa;
+                        len += pa;
+                    }
 #else // !WC_UTF16
-                if (buf)
-                    *buf++ = res;
-                len++;
+                    if (buf)
+                        *buf++ = (wchar_t)res;
+                    len++;
 #endif // WC_UTF16/!WC_UTF16
+                }
+            }
+            if (invalid)
+            {
+                if (m_options & MAP_INVALID_UTF8_TO_PUA)
+                {
+                    while (opsz < psz && (!buf || len < n))
+                    {
+#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);
+                        if (buf)
+                            buf += pa;
+                        opsz++;
+                        len += pa;
+#else
+                        if (buf)
+                            *buf++ = (wchar_t)(wxUnicodePUA + (unsigned char)*opsz);
+                        opsz++;
+                        len++;
+#endif
+                    }
+                }
+                else if (m_options & MAP_INVALID_UTF8_TO_OCTAL)
+                {
+                    while (opsz < psz && (!buf || len < n))
+                    {
+                        if ( buf && len + 3 < n )
+                        {
+                            unsigned char on = *opsz;
+                            *buf++ = L'\\';
+                            *buf++ = (wchar_t)( L'0' + on / 0100 );
+                            *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;
+                }
             }
         }
     }
@@ -330,6 +738,11 @@ size_t wxMBConvUTF8::MB2WC(wchar_t *buf, const char *psz, size_t n) const
     return len;
 }
 
+static inline bool isoctal(wchar_t wch)
+{
+    return L'0' <= wch && wch <= L'7';
+}
+
 size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
     size_t len = 0;
@@ -344,36 +757,67 @@ size_t wxMBConvUTF8::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 #else
         cc=(*psz++) & 0x7fffffff;
 #endif
-        unsigned cnt;
-        for (cnt = 0; cc > utf8_max[cnt]; cnt++) {}
-        if (!cnt)
+
+        if ( (m_options & MAP_INVALID_UTF8_TO_PUA)
+                && cc >= wxUnicodePUA && cc < wxUnicodePUAEnd )
+        {
+            if (buf)
+                *buf++ = (char)(cc - wxUnicodePUA);
+            len++;
+        }
+        else if ( (m_options & MAP_INVALID_UTF8_TO_OCTAL)
+                    && cc == L'\\' && psz[0] == L'\\' )
         {
-            // plain ASCII char
             if (buf)
-                *buf++ = (char) cc;
+                *buf++ = (char)cc;
+            psz++;
             len++;
         }
+        else if ( (m_options & MAP_INVALID_UTF8_TO_OCTAL) &&
+                    cc == L'\\' &&
+                        isoctal(psz[0]) && isoctal(psz[1]) && isoctal(psz[2]) )
+        {
+            if (buf)
+            {
+                *buf++ = (char) ((psz[0] - L'0')*0100 +
+                                 (psz[1] - L'0')*010 +
+                                 (psz[2] - L'0'));
+            }
 
+            psz += 3;
+            len++;
+        }
         else
         {
-            len += cnt + 1;
-            if (buf)
+            unsigned cnt;
+            for (cnt = 0; cc > utf8_max[cnt]; cnt++) {}
+            if (!cnt)
             {
-                *buf++ = (char) ((-128 >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt)));
-                while (cnt--)
-                    *buf++ = (char) (0x80 | ((cc >> (cnt * 6)) & 0x3f));
+                // plain ASCII char
+                if (buf)
+                    *buf++ = (char) cc;
+                len++;
+            }
+
+            else
+            {
+                len += cnt + 1;
+                if (buf)
+                {
+                    *buf++ = (char) ((-128 >> cnt) | ((cc >> (cnt * 6)) & (0x3f >> cnt)));
+                    while (cnt--)
+                        *buf++ = (char) (0x80 | ((cc >> (cnt * 6)) & 0x3f));
+                }
             }
         }
     }
 
-    if (buf && (len<n)) *buf = 0;
+    if (buf && (len<n))
+        *buf = 0;
 
     return len;
 }
 
-
-
-
 // ----------------------------------------------------------------------------
 // UTF-16
 // ----------------------------------------------------------------------------
@@ -432,20 +876,24 @@ size_t wxMBConvUTF16straight::WC2MB(char *buf, const wchar_t *psz, size_t n) con
 // swap 16bit MB to 16bit String
 size_t wxMBConvUTF16swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
-    size_t len=0;
+    size_t len = 0;
 
-    while (*(wxUint16*)psz && (!buf || len < n))
+    // 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 (buf)
+        if ( buf )
         {
             ((char *)buf)[0] = psz[1];
             ((char *)buf)[1] = psz[0];
             buf++;
         }
         len++;
-        psz += sizeof(wxUint16);
+        psz += 2;
     }
-    if (buf && len<n)   *buf=0;
+
+    if ( buf && len < n )
+        *buf = L'\0';
 
     return len;
 }
@@ -454,19 +902,21 @@ size_t wxMBConvUTF16swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 // swap 16bit MB to 16bit String
 size_t wxMBConvUTF16swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
-    size_t len=0;
+    size_t len = 0;
 
-    while (*psz && (!buf || len < n))
+    while ( *psz && (!buf || len < n) )
     {
-        if (buf)
+        if ( buf )
         {
             *buf++ = ((char*)psz)[1];
             *buf++ = ((char*)psz)[0];
         }
-        len += sizeof(wxUint16);
+        len += 2;
         psz++;
     }
-    if (buf && len<=n-sizeof(wxUint16))   *(wxUint16*)buf=0;
+
+    if ( buf && len < n )
+        *buf = '\0';
 
     return len;
 }
@@ -488,7 +938,7 @@ size_t wxMBConvUTF16straight::MB2WC(wchar_t *buf, const char *psz, size_t n) con
             return pa;
 
         if (buf)
-            *buf++ = cc;
+            *buf++ = (wchar_t)cc;
         len++;
         psz += pa * sizeof(wxUint16);
     }
@@ -548,7 +998,7 @@ size_t wxMBConvUTF16swap::MB2WC(wchar_t *buf, const char *psz, size_t n) const
             return pa;
 
         if (buf)
-            *buf++ = cc;
+            *buf++ = (wchar_t)cc;
 
         len++;
         psz += pa * sizeof(wxUint16);
@@ -749,7 +1199,7 @@ size_t wxMBConvUTF32straight::MB2WC(wchar_t *buf, const char *psz, size_t n) con
     while (*(wxUint32*)psz && (!buf || len < n))
     {
         if (buf)
-            *buf++ = *(wxUint32*)psz;
+            *buf++ = (wchar_t)(*(wxUint32*)psz);
         len++;
         psz += sizeof(wxUint32);
     }
@@ -845,12 +1295,13 @@ size_t wxMBConvUTF32swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 
 #ifdef HAVE_ICONV
 
-// VS: glibc 2.1.3 is broken in that iconv() conversion to/from UCS4 fails with E2BIG
-//     if output buffer is _exactly_ as big as needed. Such case is (unless there's
-//     yet another bug in glibc) the only case when iconv() returns with (size_t)-1
-//     (which means error) and says there are 0 bytes left in the input buffer --
-//     when _real_ error occurs, bytes-left-in-input buffer is non-zero. Hence,
-//     this alternative test for iconv() failure.
+// VS: glibc 2.1.3 is broken in that iconv() conversion to/from UCS4 fails with
+//     E2BIG if output buffer is _exactly_ as big as needed. Such case is
+//     (unless there's yet another bug in glibc) the only case when iconv()
+//     returns with (size_t)-1 (which means error) and says there are 0 bytes
+//     left in the input buffer -- when _real_ error occurs,
+//     bytes-left-in-input buffer is non-zero. Hence, this alternative test for
+//     iconv() failure.
 //     [This bug does not appear in glibc 2.2.]
 #if defined(__GLIBC__) && __GLIBC__ == 2 && __GLIBC_MINOR__ <= 1
 #define ICONV_FAILED(cres, bufLeft) ((cres == (size_t)-1) && \
@@ -861,6 +1312,19 @@ size_t wxMBConvUTF32swap::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 
 #define ICONV_CHAR_CAST(x)  ((ICONV_CONST char **)(x))
 
+#define ICONV_T_INVALID ((iconv_t)-1)
+
+#if SIZEOF_WCHAR_T == 4
+    #define WC_BSWAP    wxUINT32_SWAP_ALWAYS
+    #define WC_ENC      wxFONTENCODING_UTF32
+#elif SIZEOF_WCHAR_T == 2
+    #define WC_BSWAP    wxUINT16_SWAP_ALWAYS
+    #define WC_ENC      wxFONTENCODING_UTF16
+#else // sizeof(wchar_t) != 2 nor 4
+    // does this ever happen?
+    #error "Unknown sizeof(wchar_t): please report this to wx-dev@lists.wxwindows.org"
+#endif
+
 // ----------------------------------------------------------------------------
 // wxMBConv_iconv: encapsulates an iconv character set
 // ----------------------------------------------------------------------------
@@ -875,124 +1339,185 @@ public:
     virtual size_t WC2MB(char *buf, const wchar_t *psz, size_t n) const;
 
     bool IsOk() const
-        { return (m2w != (iconv_t)-1) && (w2m != (iconv_t)-1); }
+        { 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
     iconv_t m2w,
             w2m;
+#if wxUSE_THREADS
+    // guards access to m2w and w2m objects
+    wxMutex m_iconvMutex;
+#endif
 
 private:
+    virtual const char *GetMBNul(size_t *nulLen) const;
+
     // the name (for iconv_open()) of a wide char charset -- if none is
     // available on this machine, it will remain NULL
-    static const char *ms_wcCharsetName;
+    static wxString ms_wcCharsetName;
 
     // true if the wide char encoding we use (i.e. ms_wcCharsetName) has
     // different endian-ness than the native one
     static bool ms_wcNeedsSwap;
+
+    // NUL representation
+    size_t m_nulLen;
+    char m_nulBuf[8];
 };
 
-const char *wxMBConv_iconv::ms_wcCharsetName = NULL;
+// make the constructor available for unit testing
+WXDLLIMPEXP_BASE wxMBConv* new_wxMBConv_iconv( const wxChar* name )
+{
+    wxMBConv_iconv* result = new wxMBConv_iconv( name );
+    if ( !result->IsOk() )
+    {
+        delete result;
+        return 0;
+    }
+    return result;
+}
+
+wxString wxMBConv_iconv::ms_wcCharsetName;
 bool wxMBConv_iconv::ms_wcNeedsSwap = false;
 
 wxMBConv_iconv::wxMBConv_iconv(const wxChar *name)
 {
-    // Do it the hard way
-    char cname[100];
-    for (size_t i = 0; i < wxStrlen(name)+1; i++)
-        cname[i] = (char) name[i];
+    m_nulLen = (size_t)-2;
+
+    // iconv operates with chars, not wxChars, but luckily it uses only ASCII
+    // names for the charsets
+    const wxCharBuffer cname(wxString(name).ToAscii());
 
     // check for charset that represents wchar_t:
-    if (ms_wcCharsetName == NULL)
+    if ( ms_wcCharsetName.empty() )
     {
-        ms_wcNeedsSwap = false;
+        wxLogTrace(TRACE_STRCONV, _T("Looking for wide char codeset:"));
 
-        // try charset with explicit bytesex info (e.g. "UCS-4LE"):
-        ms_wcCharsetName = WC_NAME_BEST;
-        m2w = iconv_open(ms_wcCharsetName, cname);
+#if wxUSE_FONTMAP
+        const wxChar **names = wxFontMapperBase::GetAllEncodingNames(WC_ENC);
+#else // !wxUSE_FONTMAP
+        static const wxChar *names[] =
+        {
+#if SIZEOF_WCHAR_T == 4
+            _T("UCS-4"),
+#elif SIZEOF_WCHAR_T = 2
+            _T("UCS-2"),
+#endif
+            NULL
+        };
+#endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
 
-        if (m2w == (iconv_t)-1)
+        for ( ; *names && ms_wcCharsetName.empty(); ++names )
         {
-            // try charset w/o bytesex info (e.g. "UCS4")
-            // and check for bytesex ourselves:
-            ms_wcCharsetName = WC_NAME;
-            m2w = iconv_open(ms_wcCharsetName, cname);
+            const wxString nameCS(*names);
 
-            // last bet, try if it knows WCHAR_T pseudo-charset
-            if (m2w == (iconv_t)-1)
-            {
-                ms_wcCharsetName = "WCHAR_T";
-                m2w = iconv_open(ms_wcCharsetName, cname);
-            }
+            // first try charset with explicit bytesex info (e.g. "UCS-4LE"):
+            wxString nameXE(nameCS);
+            #ifdef WORDS_BIGENDIAN
+                nameXE += _T("BE");
+            #else // little endian
+                nameXE += _T("LE");
+            #endif
+
+            wxLogTrace(TRACE_STRCONV, _T("  trying charset \"%s\""),
+                       nameXE.c_str());
 
-            if (m2w != (iconv_t)-1)
+            m2w = iconv_open(nameXE.ToAscii(), cname);
+            if ( m2w == ICONV_T_INVALID )
             {
-                char    buf[2], *bufPtr;
-                wchar_t wbuf[2], *wbufPtr;
-                size_t  insz, outsz;
-                size_t  res;
-
-                buf[0] = 'A';
-                buf[1] = 0;
-                wbuf[0] = 0;
-                insz = 2;
-                outsz = SIZEOF_WCHAR_T * 2;
-                wbufPtr = wbuf;
-                bufPtr = buf;
-
-                res = iconv(m2w, ICONV_CHAR_CAST(&bufPtr), &insz,
-                            (char**)&wbufPtr, &outsz);
-
-                if (ICONV_FAILED(res, insz))
-                {
-                    ms_wcCharsetName = NULL;
-                    wxLogLastError(wxT("iconv"));
-                    wxLogError(_("Conversion to charset '%s' doesn't work."), name);
-                }
-                else
+                // try charset w/o bytesex info (e.g. "UCS4")
+                wxLogTrace(TRACE_STRCONV, _T("  trying charset \"%s\""),
+                           nameCS.c_str());
+                m2w = iconv_open(nameCS.ToAscii(), cname);
+
+                // and check for bytesex ourselves:
+                if ( m2w != ICONV_T_INVALID )
                 {
-                    ms_wcNeedsSwap = wbuf[0] != (wchar_t)buf[0];
+                    char    buf[2], *bufPtr;
+                    wchar_t wbuf[2], *wbufPtr;
+                    size_t  insz, outsz;
+                    size_t  res;
+
+                    buf[0] = 'A';
+                    buf[1] = 0;
+                    wbuf[0] = 0;
+                    insz = 2;
+                    outsz = SIZEOF_WCHAR_T * 2;
+                    wbufPtr = wbuf;
+                    bufPtr = buf;
+
+                    res = iconv(m2w, ICONV_CHAR_CAST(&bufPtr), &insz,
+                                (char**)&wbufPtr, &outsz);
+
+                    if (ICONV_FAILED(res, insz))
+                    {
+                        wxLogLastError(wxT("iconv"));
+                        wxLogError(_("Conversion to charset '%s' doesn't work."),
+                                   nameCS.c_str());
+                    }
+                    else // ok, can convert to this encoding, remember it
+                    {
+                        ms_wcCharsetName = nameCS;
+                        ms_wcNeedsSwap = wbuf[0] != (wchar_t)buf[0];
+                    }
                 }
             }
-            else
+            else // use charset not requiring byte swapping
             {
-                ms_wcCharsetName = NULL;
-
-                // VS: we must not output an error here, since wxWidgets will safely
-                //     fall back to using wxEncodingConverter.
-                wxLogTrace(wxT("strconv"), wxT("Impossible to convert to/from charset '%s' with iconv, falling back to wxEncodingConverter."), name);
-                //wxLogError(
+                ms_wcCharsetName = nameXE;
             }
         }
-        wxLogTrace(wxT("strconv"), wxT("wchar_t charset is '%s', needs swap: %i"), ms_wcCharsetName, ms_wcNeedsSwap);
+
+        wxLogTrace(TRACE_STRCONV,
+                   wxT("iconv wchar_t charset is \"%s\"%s"),
+                   ms_wcCharsetName.empty() ? _T("<none>")
+                                            : ms_wcCharsetName.c_str(),
+                   ms_wcNeedsSwap ? _T(" (needs swap)")
+                                  : _T(""));
     }
     else // we already have ms_wcCharsetName
     {
-        m2w = iconv_open(ms_wcCharsetName, cname);
+        m2w = iconv_open(ms_wcCharsetName.ToAscii(), cname);
     }
 
-    // NB: don't ever pass NULL to iconv_open(), it may crash!
-    if ( ms_wcCharsetName )
+    if ( ms_wcCharsetName.empty() )
     {
-        w2m = iconv_open( cname, ms_wcCharsetName);
+        w2m = ICONV_T_INVALID;
     }
     else
     {
-        w2m = (iconv_t)-1;
+        w2m = iconv_open(cname, ms_wcCharsetName.ToAscii());
+        if ( w2m == ICONV_T_INVALID )
+        {
+            wxLogTrace(TRACE_STRCONV,
+                       wxT("\"%s\" -> \"%s\" works but not the converse!?"),
+                       ms_wcCharsetName.c_str(), cname.data());
+        }
     }
 }
 
 wxMBConv_iconv::~wxMBConv_iconv()
 {
-    if ( m2w != (iconv_t)-1 )
+    if ( m2w != ICONV_T_INVALID )
         iconv_close(m2w);
-    if ( w2m != (iconv_t)-1 )
+    if ( w2m != ICONV_T_INVALID )
         iconv_close(w2m);
 }
 
 size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 {
+#if wxUSE_THREADS
+    // NB: iconv() is MT-safe, but each thread must use it's own iconv_t handle.
+    //     Unfortunately there is a couple of global wxCSConv objects such as
+    //     wxConvLocal that are used all over wx code, so we have to make sure
+    //     the handle is used by at most one thread at the time. Otherwise
+    //     only a few wx classes would be safe to use from non-main threads
+    //     as MB<->WC conversion would fail "randomly".
+    wxMutexLocker lock(wxConstCast(this, wxMBConv_iconv)->m_iconvMutex);
+#endif
+
     size_t inbuf = strlen(psz);
     size_t outbuf = n * SIZEOF_WCHAR_T;
     size_t res, cres;
@@ -1011,7 +1536,8 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
         if (ms_wcNeedsSwap)
         {
             // convert to native endianness
-            WC_BSWAP(buf /* _not_ bufPtr */, res)
+            for ( unsigned i = 0; i < res; i++ )
+                buf[n] = WC_BSWAP(buf[i]);
         }
 
         // NB: iconv was given only strlen(psz) characters on input, and so
@@ -1041,7 +1567,7 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
     if (ICONV_FAILED(cres, inbuf))
     {
         //VS: it is ok if iconv fails, hence trace only
-        wxLogTrace(wxT("strconv"), wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
+        wxLogTrace(TRACE_STRCONV, wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
         return (size_t)-1;
     }
 
@@ -1050,7 +1576,13 @@ size_t wxMBConv_iconv::MB2WC(wchar_t *buf, const char *psz, size_t n) const
 
 size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 {
-    size_t inbuf = wxWcslen(psz) * SIZEOF_WCHAR_T;
+#if wxUSE_THREADS
+    // NB: explained in MB2WC
+    wxMutexLocker lock(wxConstCast(this, wxMBConv_iconv)->m_iconvMutex);
+#endif
+
+    size_t inlen = wxWcslen(psz);
+    size_t inbuf = inlen * SIZEOF_WCHAR_T;
     size_t outbuf = n;
     size_t res, cres;
 
@@ -1059,13 +1591,13 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     if (ms_wcNeedsSwap)
     {
         // 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
+        // (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)
-        tmpbuf=(wchar_t*)malloc((inbuf+1)*SIZEOF_WCHAR_T);
-        memcpy(tmpbuf,psz,(inbuf+1)*SIZEOF_WCHAR_T);
-        WC_BSWAP(tmpbuf, inbuf)
-        psz=tmpbuf;
+        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;
     }
 
     if (buf)
@@ -1103,12 +1635,41 @@ size_t wxMBConv_iconv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
 
     if (ICONV_FAILED(cres, inbuf))
     {
-        //VS: it is ok if iconv fails, hence trace only
-        wxLogTrace(wxT("strconv"), wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
+        wxLogTrace(TRACE_STRCONV, wxT("iconv failed: %s"), wxSysErrorMsg(wxSysErrorCode()));
         return (size_t)-1;
     }
 
-    return res;
+    return res;
+}
+
+const char *wxMBConv_iconv::GetMBNul(size_t *nulLen) const
+{
+    if ( m_nulLen == (size_t)-2 )
+    {
+        wxMBConv_iconv * const self = wxConstCast(this, wxMBConv_iconv);
+
+#if wxUSE_THREADS
+        // NB: explained in MB2WC
+        wxMutexLocker lock(self->m_iconvMutex);
+#endif
+
+        wchar_t *wnul = L"";
+        size_t inLen = sizeof(wchar_t),
+               outLen = WXSIZEOF(m_nulBuf);
+        const char *in = (char *)wnul;
+        char *out = self->m_nulBuf;
+        if ( iconv(w2m, &in, &inLen, &out, &outLen) == (size_t)-1 )
+        {
+            self->m_nulLen = (size_t)-1;
+        }
+        else // ok
+        {
+            self->m_nulLen = out - m_nulBuf;
+        }
+    }
+
+    *nulLen = m_nulLen;
+    return m_nulBuf;
 }
 
 #endif // HAVE_ICONV
@@ -1132,19 +1693,22 @@ public:
     wxMBConv_win32()
     {
         m_CodePage = CP_ACP;
+        m_nulLen = (size_t)-2;
     }
 
 #if wxUSE_FONTMAP
     wxMBConv_win32(const wxChar* name)
     {
         m_CodePage = wxCharsetToCodepage(name);
+        m_nulLen = (size_t)-2;
     }
 
     wxMBConv_win32(wxFontEncoding encoding)
     {
         m_CodePage = wxEncodingToCodepage(encoding);
+        m_nulLen = (size_t)-2;
     }
-#endif
+#endif // wxUSE_FONTMAP
 
     size_t MB2WC(wchar_t *buf, const char *psz, size_t n) const
     {
@@ -1153,20 +1717,81 @@ public:
         // and break the library itself, e.g. wxTextInputStream::NextChar()
         // 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:
+        //     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() )
+        {
+            flags = MB_ERR_INVALID_CHARS;
+        }
+        else if ( m_CodePage == CP_UTF8 )
+        {
+            // Avoid round-trip in the special case of UTF-8 by using our
+            // own UTF-8 conversion code:
+            return wxMBConvUTF8().MB2WC(buf, psz, n);
+        }
+
         const size_t len = ::MultiByteToWideChar
                              (
                                 m_CodePage,     // code page
-                                MB_ERR_INVALID_CHARS, // flags: fall on error
+                                flags,          // flags: fall on error
                                 psz,            // input string
                                 -1,             // its length (NUL-terminated)
                                 buf,            // output string
                                 buf ? n : 0     // size of output buffer
                              );
+        if ( !len )
+        {
+            // function totally failed
+            return (size_t)-1;
+        }
+
+        // if we were really converting and didn't use MB_ERR_INVALID_CHARS,
+        // check if we succeeded, by doing a double trip:
+        if ( !flags && buf )
+        {
+            const size_t mbLen = strlen(psz);
+            wxCharBuffer mbBuf(mbLen);
+            if ( ::WideCharToMultiByte
+                   (
+                      m_CodePage,
+                      0,
+                      buf,
+                      -1,
+                      mbBuf.data(),
+                      mbLen + 1,        // size in bytes, not length
+                      NULL,
+                      NULL
+                   ) == 0 ||
+                  strcmp(mbBuf, psz) != 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;
+            }
+        }
 
         // note that it returns count of written chars for buf != NULL and size
         // of the needed buffer for buf == NULL so in either case the length of
         // the string (which never includes the terminating NUL) is one less
-        return len ? len - 1 : (size_t)-1;
+        return len 1;
     }
 
     size_t WC2MB(char *buf, const wchar_t *pwz, size_t n) const
@@ -1281,7 +1906,62 @@ private:
         return s_isWin98Or2k == 1;
     }
 
+    static bool IsAtLeastWin2kSP4()
+    {
+#ifdef __WXWINCE__
+        return false;
+#else
+        static int s_isAtLeastWin2kSP4 = -1;
+
+        if ( s_isAtLeastWin2kSP4 == -1 )
+        {
+            OSVERSIONINFOEX ver;
+
+            memset(&ver, 0, sizeof(ver));
+            ver.dwOSVersionInfoSize = sizeof(ver);
+            GetVersionEx((OSVERSIONINFO*)&ver);
+
+            s_isAtLeastWin2kSP4 =
+              ((ver.dwMajorVersion > 5) || // Vista+
+               (ver.dwMajorVersion == 5 && ver.dwMinorVersion > 0) || // XP/2003
+               (ver.dwMajorVersion == 5 && ver.dwMinorVersion == 0 &&
+               ver.wServicePackMajor >= 4)) // 2000 SP4+
+              ? 1 : 0;
+        }
+
+        return s_isAtLeastWin2kSP4 == 1;
+#endif
+    }
+
+    virtual const char *GetMBNul(size_t *nulLen) const
+    {
+        if ( m_nulLen == (size_t)-2 )
+        {
+            wxMBConv_win32 * const self = wxConstCast(this, wxMBConv_win32);
+
+            self->m_nulLen = ::WideCharToMultiByte
+                               (
+                                    m_CodePage,         // code page
+                                    0,                  // no flags
+                                    L"",                // input string
+                                    1,                  // translate just NUL
+                                    self->m_nulBuf,     // output buffer
+                                    WXSIZEOF(m_nulBuf), // and its size
+                                    NULL,               // "replacement" char
+                                    NULL                // [out] was it used?
+                               );
+
+            if ( m_nulLen == 0 )
+                self->m_nulLen = (size_t)-1;
+        }
+
+        *nulLen = m_nulLen;
+        return m_nulBuf;
+    }
+
     long m_CodePage;
+    size_t m_nulLen;
+    char m_nulBuf[8];
 };
 
 #endif // wxHAVE_WIN32_MB2WC
@@ -1301,14 +1981,10 @@ private:
 
 CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
 {
-    CFStringEncoding enc = 0 ;
+    CFStringEncoding enc = kCFStringEncodingInvalidId ;
     if ( encoding == wxFONTENCODING_DEFAULT )
     {
-#if wxUSE_GUI
-        encoding = wxFont::GetDefaultEncoding() ;
-#else
-        encoding = wxLocale::GetSystemEncoding() ;
-#endif
+        enc = CFStringGetSystemEncoding();
     }
     else switch( encoding)
     {
@@ -1396,7 +2072,6 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
         case wxFONTENCODING_CP950 :
             enc = kCFStringEncodingDOSChineseTrad;
             break ;
-
         case wxFONTENCODING_CP1250 :
             enc = kCFStringEncodingWindowsLatin2;
             break ;
@@ -1421,9 +2096,10 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
         case wxFONTENCODING_CP1257 :
             enc = kCFStringEncodingWindowsBalticRim;
             break ;
-        case wxFONTENCODING_UTF7 :
-            enc = kCFStringEncodingNonLossyASCII ;
-            break ;
+//   This only really encodes to UTF7 (if that) evidently
+//        case wxFONTENCODING_UTF7 :
+//            enc = kCFStringEncodingNonLossyASCII ;
+//            break ;
         case wxFONTENCODING_UTF8 :
             enc = kCFStringEncodingUTF8 ;
             break ;
@@ -1560,245 +2236,6 @@ CFStringEncoding wxCFStringEncFromFontEnc(wxFontEncoding encoding)
     return enc ;
 }
 
-wxFontEncoding wxFontEncFromCFStringEnc(CFStringEncoding encoding)
-{
-    wxFontEncoding enc = wxFONTENCODING_DEFAULT ;
-
-    switch( encoding)
-    {
-        case kCFStringEncodingISOLatin1  :
-            enc = wxFONTENCODING_ISO8859_1 ;
-            break ;
-        case kCFStringEncodingISOLatin2 :
-            enc = wxFONTENCODING_ISO8859_2;
-            break ;
-        case kCFStringEncodingISOLatin3 :
-            enc = wxFONTENCODING_ISO8859_3 ;
-            break ;
-        case kCFStringEncodingISOLatin4 :
-            enc = wxFONTENCODING_ISO8859_4;
-            break ;
-        case kCFStringEncodingISOLatinCyrillic :
-            enc = wxFONTENCODING_ISO8859_5;
-            break ;
-        case kCFStringEncodingISOLatinArabic :
-            enc = wxFONTENCODING_ISO8859_6;
-            break ;
-        case kCFStringEncodingISOLatinGreek :
-            enc = wxFONTENCODING_ISO8859_7;
-            break ;
-        case kCFStringEncodingISOLatinHebrew :
-            enc = wxFONTENCODING_ISO8859_8;
-            break ;
-        case kCFStringEncodingISOLatin5 :
-            enc = wxFONTENCODING_ISO8859_9;
-            break ;
-        case kCFStringEncodingISOLatin6 :
-            enc = wxFONTENCODING_ISO8859_10;
-            break ;
-        case kCFStringEncodingISOLatin7 :
-            enc = wxFONTENCODING_ISO8859_13;
-            break ;
-        case kCFStringEncodingISOLatin8 :
-            enc = wxFONTENCODING_ISO8859_14;
-            break ;
-        case kCFStringEncodingISOLatin9 :
-            enc =wxFONTENCODING_ISO8859_15 ;
-            break ;
-
-        case kCFStringEncodingKOI8_R :
-            enc = wxFONTENCODING_KOI8;
-            break ;
-
-//      case  :
-//          enc = wxFONTENCODING_BULGARIAN;
-//          break ;
-
-        case kCFStringEncodingDOSLatinUS :
-            enc = wxFONTENCODING_CP437;
-            break ;
-        case kCFStringEncodingDOSLatin1 :
-            enc = wxFONTENCODING_CP850;
-            break ;
-        case kCFStringEncodingDOSLatin2 :
-            enc =wxFONTENCODING_CP852 ;
-            break ;
-        case kCFStringEncodingDOSCyrillic :
-            enc = wxFONTENCODING_CP855;
-            break ;
-        case kCFStringEncodingDOSRussian :
-            enc = wxFONTENCODING_CP866;
-            break ;
-        case kCFStringEncodingDOSThai :
-            enc =wxFONTENCODING_CP874 ;
-            break ;
-        case kCFStringEncodingDOSJapanese :
-            enc = wxFONTENCODING_CP932;
-            break ;
-        case kCFStringEncodingDOSChineseSimplif :
-            enc = wxFONTENCODING_CP936;
-            break ;
-        case kCFStringEncodingDOSKorean :
-            enc = wxFONTENCODING_CP949;
-            break ;
-        case kCFStringEncodingDOSChineseTrad :
-            enc = wxFONTENCODING_CP950;
-            break ;
-
-        case kCFStringEncodingWindowsLatin2 :
-            enc = wxFONTENCODING_CP1250;
-            break ;
-        case kCFStringEncodingWindowsCyrillic :
-            enc = wxFONTENCODING_CP1251;
-            break ;
-        case kCFStringEncodingWindowsLatin1 :
-            enc = wxFONTENCODING_CP1252;
-            break ;
-        case kCFStringEncodingWindowsGreek :
-            enc = wxFONTENCODING_CP1253;
-            break ;
-        case kCFStringEncodingWindowsLatin5 :
-            enc = wxFONTENCODING_CP1254;
-            break ;
-        case kCFStringEncodingWindowsHebrew :
-            enc = wxFONTENCODING_CP1255;
-            break ;
-        case kCFStringEncodingWindowsArabic :
-            enc = wxFONTENCODING_CP1256;
-            break ;
-        case kCFStringEncodingWindowsBalticRim :
-            enc =wxFONTENCODING_CP1257 ;
-            break ;
-        case kCFStringEncodingEUC_JP :
-            enc = wxFONTENCODING_EUC_JP;
-            break ;
-        case kCFStringEncodingUnicode :
-            enc = wxFONTENCODING_UTF16;
-            break;
-        case kCFStringEncodingMacRoman :
-            enc = wxFONTENCODING_MACROMAN ;
-            break ;
-        case kCFStringEncodingMacJapanese :
-            enc = wxFONTENCODING_MACJAPANESE ;
-            break ;
-        case kCFStringEncodingMacChineseTrad :
-            enc = wxFONTENCODING_MACCHINESETRAD ;
-            break ;
-        case kCFStringEncodingMacKorean :
-            enc = wxFONTENCODING_MACKOREAN ;
-            break ;
-        case kCFStringEncodingMacArabic :
-            enc =wxFONTENCODING_MACARABIC ;
-            break ;
-        case kCFStringEncodingMacHebrew :
-            enc = wxFONTENCODING_MACHEBREW ;
-            break ;
-        case kCFStringEncodingMacGreek :
-            enc = wxFONTENCODING_MACGREEK ;
-            break ;
-        case kCFStringEncodingMacCyrillic :
-            enc = wxFONTENCODING_MACCYRILLIC ;
-            break ;
-        case kCFStringEncodingMacDevanagari :
-            enc = wxFONTENCODING_MACDEVANAGARI ;
-            break ;
-        case kCFStringEncodingMacGurmukhi :
-            enc = wxFONTENCODING_MACGURMUKHI ;
-            break ;
-        case kCFStringEncodingMacGujarati :
-            enc = wxFONTENCODING_MACGUJARATI ;
-            break ;
-        case kCFStringEncodingMacOriya :
-            enc =wxFONTENCODING_MACORIYA ;
-            break ;
-        case kCFStringEncodingMacBengali :
-            enc =wxFONTENCODING_MACBENGALI ;
-            break ;
-        case kCFStringEncodingMacTamil :
-            enc = wxFONTENCODING_MACTAMIL ;
-            break ;
-        case kCFStringEncodingMacTelugu :
-            enc = wxFONTENCODING_MACTELUGU ;
-            break ;
-        case kCFStringEncodingMacKannada :
-            enc = wxFONTENCODING_MACKANNADA ;
-            break ;
-        case kCFStringEncodingMacMalayalam :
-            enc = wxFONTENCODING_MACMALAJALAM ;
-            break ;
-        case kCFStringEncodingMacSinhalese :
-            enc = wxFONTENCODING_MACSINHALESE ;
-            break ;
-        case kCFStringEncodingMacBurmese :
-            enc = wxFONTENCODING_MACBURMESE ;
-            break ;
-        case kCFStringEncodingMacKhmer :
-            enc = wxFONTENCODING_MACKHMER ;
-            break ;
-        case kCFStringEncodingMacThai :
-            enc = wxFONTENCODING_MACTHAI ;
-            break ;
-        case kCFStringEncodingMacLaotian :
-            enc = wxFONTENCODING_MACLAOTIAN ;
-            break ;
-        case kCFStringEncodingMacGeorgian :
-            enc = wxFONTENCODING_MACGEORGIAN ;
-            break ;
-        case kCFStringEncodingMacArmenian :
-            enc = wxFONTENCODING_MACARMENIAN ;
-            break ;
-        case kCFStringEncodingMacChineseSimp :
-            enc = wxFONTENCODING_MACCHINESESIMP ;
-            break ;
-        case kCFStringEncodingMacTibetan :
-            enc = wxFONTENCODING_MACTIBETAN ;
-            break ;
-        case kCFStringEncodingMacMongolian :
-            enc = wxFONTENCODING_MACMONGOLIAN ;
-            break ;
-        case kCFStringEncodingMacEthiopic :
-            enc = wxFONTENCODING_MACETHIOPIC ;
-            break ;
-        case kCFStringEncodingMacCentralEurRoman:
-            enc = wxFONTENCODING_MACCENTRALEUR  ;
-            break ;
-        case kCFStringEncodingMacVietnamese:
-            enc = wxFONTENCODING_MACVIATNAMESE  ;
-            break ;
-        case kCFStringEncodingMacExtArabic :
-            enc = wxFONTENCODING_MACARABICEXT ;
-            break ;
-        case kCFStringEncodingMacSymbol :
-            enc = wxFONTENCODING_MACSYMBOL ;
-            break ;
-        case kCFStringEncodingMacDingbats :
-            enc = wxFONTENCODING_MACDINGBATS ;
-            break ;
-        case kCFStringEncodingMacTurkish :
-            enc = wxFONTENCODING_MACTURKISH ;
-            break ;
-        case kCFStringEncodingMacCroatian :
-            enc = wxFONTENCODING_MACCROATIAN ;
-            break ;
-        case kCFStringEncodingMacIcelandic :
-            enc = wxFONTENCODING_MACICELANDIC ;
-            break ;
-        case kCFStringEncodingMacRomanian :
-            enc = wxFONTENCODING_MACROMANIAN ;
-            break ;
-        case kCFStringEncodingMacCeltic :
-            enc = wxFONTENCODING_MACCELTIC ;
-            break ;
-        case kCFStringEncodingMacGaelic :
-            enc = wxFONTENCODING_MACGAELIC ;
-            break ;
-//        case kCFStringEncodingMacKeyboardGlyphs :
-//            enc = wxFONTENCODING_MACKEYBOARD ;
-//            break ;
-    } ;
-    return enc ;
-}
-
 class wxMBConv_cocoa : public wxMBConv
 {
 public:
@@ -1807,10 +2244,12 @@ public:
         Init(CFStringGetSystemEncoding()) ;
     }
 
+#if wxUSE_FONTMAP
     wxMBConv_cocoa(const wxChar* name)
     {
-        Init( wxCFStringEncFromFontEnc(wxFontMapper::Get()->CharsetToEncoding(name, false) ) ) ;
+        Init( wxCFStringEncFromFontEnc(wxFontMapperBase::Get()->CharsetToEncoding(name, false) ) ) ;
     }
+#endif
 
     wxMBConv_cocoa(wxFontEncoding encoding)
     {
@@ -1823,160 +2262,118 @@ public:
 
     void Init( CFStringEncoding encoding)
     {
-        m_char_encoding = encoding ;
-        m_unicode_encoding = kCFStringEncodingUnicode;
+        m_encoding = encoding ;
     }
 
     size_t MB2WC(wchar_t * szOut, const char * szUnConv, size_t nOutSize) const
     {
         wxASSERT(szUnConv);
 
-        size_t nBufSize = strlen(szUnConv) + 1;
-        size_t nRealOutSize;
-
-        UniChar* szUniCharBuffer    = (UniChar*) szOut;
-        wchar_t* szConvBuffer       = szOut;
-
-        if (szConvBuffer == NULL && nOutSize != 0)
-        {
-            szConvBuffer = new wchar_t[nOutSize] ;
-        }
-
-#if SIZEOF_WCHAR_T == 4
-        szUniCharBuffer = new UniChar[nOutSize];
-#endif
-
-        CFDataRef theData = CFDataCreateWithBytesNoCopy (
-                                            NULL,     //allocator
-                                            (const UInt8*)szUnConv,
-                                            nBufSize - 1,
-                                            NULL      //deallocator
-                                            );
-
-        wxASSERT(theData);
-
-        CFStringRef theString = CFStringCreateFromExternalRepresentation (
-                                                NULL,
-                                                theData,
-                                                m_char_encoding
+        CFStringRef theString = CFStringCreateWithBytes (
+                                                NULL, //the allocator
+                                                (const UInt8*)szUnConv,
+                                                strlen(szUnConv),
+                                                m_encoding,
+                                                false //no BOM/external representation
                                                 );
 
         wxASSERT(theString);
 
-        if (nOutSize == 0)
+        size_t nOutLength = CFStringGetLength(theString);
+
+        if (szOut == NULL)
         {
-            nRealOutSize = CFStringGetLength(theString) + 1;
             CFRelease(theString);
-            return nRealOutSize - 1;
+            return nOutLength;
         }
 
-        CFRange theRange = { 0, CFStringGetLength(theString) };
-
-        CFStringGetCharacters(theString, theRange, szUniCharBuffer);
+        CFRange theRange = { 0, nOutSize };
 
+#if SIZEOF_WCHAR_T == 4
+        UniChar* szUniCharBuffer = new UniChar[nOutSize];
+#endif
 
-        nRealOutSize = (CFStringGetLength(theString) + 1);
+        CFStringGetCharacters(theString, theRange, szUniCharBuffer);
 
         CFRelease(theString);
 
-        szUniCharBuffer[nRealOutSize-1] = '\0' ;
+        szUniCharBuffer[nOutLength] = '\0' ;
 
 #if SIZEOF_WCHAR_T == 4
         wxMBConvUTF16 converter ;
-        converter.MB2WC(szConvBuffer  , (const char*)szUniCharBuffer , nRealOutSize ) ;
+        converter.MB2WC(szOut, (const char*)szUniCharBuffer , nOutSize ) ;
         delete[] szUniCharBuffer;
 #endif
-        if ( szOut == NULL )
-            delete [] szConvBuffer;
 
-        return nRealOutSize ;
+        return nOutLength;
     }
 
     size_t WC2MB(char *szOut, const wchar_t *szUnConv, size_t nOutSize) const
     {
-        size_t nBufSize = wxWcslen(szUnConv) + 1;
+        wxASSERT(szUnConv);
+
         size_t nRealOutSize;
-        char* szBuffer = szOut;
+        size_t nBufSize = wxWcslen(szUnConv);
         UniChar* szUniBuffer = (UniChar*) szUnConv;
 
-        if (szOut == NULL)
-        {
-            // worst case
-            nRealOutSize = ((nBufSize - 1) << 2)+1 ;
-            szBuffer = new char[ nRealOutSize ] ;
-        }
-        else
-            nRealOutSize = nOutSize;
-
 #if SIZEOF_WCHAR_T == 4
-        wxMBConvUTF16BE converter ;
+        wxMBConvUTF16 converter ;
         nBufSize = converter.WC2MB( NULL , szUnConv , 0 );
         szUniBuffer = new UniChar[ (nBufSize / sizeof(UniChar)) + 1] ;
         converter.WC2MB( (char*) szUniBuffer , szUnConv, nBufSize + sizeof(UniChar)) ;
         nBufSize /= sizeof(UniChar);
-        ++nBufSize;
 #endif
 
         CFStringRef theString = CFStringCreateWithCharactersNoCopy(
                                 NULL, //allocator
                                 szUniBuffer,
                                 nBufSize,
-                                NULL //deallocator
+                                kCFAllocatorNull //deallocator - we want to deallocate it ourselves
                             );
 
         wxASSERT(theString);
 
         //Note that CER puts a BOM when converting to unicode
-        //so we may want to check and use getchars instead in that case
-        CFDataRef theData = CFStringCreateExternalRepresentation(
-                                NULL, //allocator
-                                theString,
-                                m_char_encoding,
-                                0 //what to put in characters that can't be converted -
-                                    //0 tells CFString to return NULL if it meets such a character
-                        );
-
-        if(!theData)
-            return (size_t)-1;
-
-        CFRelease(theString);
-
-        nRealOutSize = CFDataGetLength(theData);
-
-        if ( szOut == NULL )
-            delete[] szBuffer;
+        //so we  check and use getchars instead in that case
+        if (m_encoding == kCFStringEncodingUnicode)
+        {
+            if (szOut != NULL)
+                CFStringGetCharacters(theString, CFRangeMake(0, nOutSize - 1), (UniChar*) szOut);
 
-        if(nOutSize == 0)
+            nRealOutSize = CFStringGetLength(theString) + 1;
+        }
+        else
         {
-//TODO: This gets flagged as a non-malloced address by the debugger...
-//#if SIZEOF_WCHAR_T == 4
-//        delete[] szUniBuffer;
-//#endif
-            CFRelease(theData);
-            return nRealOutSize - 1;
+            CFStringGetBytes(
+                theString,
+                CFRangeMake(0, CFStringGetLength(theString)),
+                m_encoding,
+                0, //what to put in characters that can't be converted -
+                    //0 tells CFString to return NULL if it meets such a character
+                false, //not an external representation
+                (UInt8*) szOut,
+                nOutSize,
+                (CFIndex*) &nRealOutSize
+                        );
         }
 
-        CFRange theRange = {0, CFDataGetLength(theData) };
-        CFDataGetBytes(theData, theRange, (UInt8*) szBuffer);
+        CFRelease(theString);
 
-        CFRelease(theData);
+#if SIZEOF_WCHAR_T == 4
+        delete[] szUniBuffer;
+#endif
 
-//TODO: This gets flagged as a non-malloced address by the debugger...
-//#if SIZEOF_WCHAR_T == 4
-//        delete[] szUniBuffer;
-//#endif
         return  nRealOutSize - 1;
     }
 
     bool IsOk() const
     {
-        //TODO: check for invalid en/de/coding
-        return true;
+        return m_encoding != kCFStringEncodingInvalidId &&
+              CFStringIsEncodingAvailable(m_encoding);
     }
 
 private:
-    CFStringEncoding m_char_encoding ;
-    CFStringEncoding m_unicode_encoding ;
+    CFStringEncoding m_encoding ;
 };
 
 #endif // defined(__WXCOCOA__)
@@ -1995,10 +2392,12 @@ public:
         Init(CFStringGetSystemEncoding()) ;
     }
 
+#if wxUSE_FONTMAP
     wxMBConv_mac(const wxChar* name)
     {
-        Init( wxMacGetSystemEncFromFontEnc(wxFontMapper::Get()->CharsetToEncoding(name, false) ) ) ;
+        Init( wxMacGetSystemEncFromFontEnc(wxFontMapperBase::Get()->CharsetToEncoding(name, false) ) ) ;
     }
+#endif
 
     wxMBConv_mac(wxFontEncoding encoding)
     {
@@ -2038,7 +2437,8 @@ public:
 
         if (buf == NULL)
         {
-            n = byteInLen ;
+            //apple specs say at least 32
+            n = wxMax( 32 , byteInLen ) ;
             tbuf = (wchar_t*) malloc( n * SIZEOF_WCHAR_T) ;
         }
         ByteCount byteBufferLen = n * sizeof( UniChar ) ;
@@ -2053,7 +2453,7 @@ public:
         // 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 ;
-        wxMBConvUTF16BE converter ;
+        wxMBConvUTF16 converter ;
         res = converter.MB2WC( (buf ? buf : tbuf) , (const char*)ubuf , n ) ;
         free( ubuf ) ;
 #else
@@ -2078,15 +2478,15 @@ public:
 
         if (buf == NULL)
         {
-            // worst case
-            n = byteInLen << 1 ;
+            //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
-        wxMBConvUTF16BE converter ;
+        wxMBConvUTF16 converter ;
         size_t unicharlen = converter.WC2MB( NULL , psz , 0 ) ;
         byteInLen = unicharlen ;
         ubuf = (UniChar*) malloc( byteInLen + 2 ) ;
@@ -2104,8 +2504,23 @@ public:
 
         size_t res = byteOutLen ;
         if ( buf  && res < n)
+        {
             buf[res] = 0;
 
+            //we need to double-trip to verify it didn't insert any ? in place
+            //of bogus characters
+            wxWCharBuffer wcBuf(n);
+            size_t pszlen = wxWcslen(psz);
+            if ( MB2WC(wcBuf.data(), buf, n) == (size_t)-1 ||
+                        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 res ;
     }
 
@@ -2143,7 +2558,7 @@ public:
     wxMBConv_wxwin(const wxChar* name)
     {
         if (name)
-            m_enc = wxFontMapper::Get()->CharsetToEncoding(name, false);
+            m_enc = wxFontMapperBase::Get()->CharsetToEncoding(name, false);
         else
             m_enc = wxFONTENCODING_SYSTEM;
 
@@ -2161,7 +2576,10 @@ public:
     {
         size_t inbuf = strlen(psz);
         if (buf)
-            m2w.Convert(psz,buf);
+        {
+            if (!m2w.Convert(psz,buf))
+                return (size_t)-1;
+        }
         return inbuf;
     }
 
@@ -2169,7 +2587,10 @@ public:
     {
         const size_t inbuf = wxWcslen(psz);
         if (buf)
-            w2m.Convert(psz,buf);
+        {
+            if (!w2m.Convert(psz,buf))
+                return (size_t)-1;
+        }
 
         return inbuf;
     }
@@ -2180,12 +2601,45 @@ public:
     wxFontEncoding m_enc;
     wxEncodingConverter m2w, w2m;
 
+private:
+    virtual const char *GetMBNul(size_t *nulLen) const
+    {
+        switch ( m_enc )
+        {
+            case wxFONTENCODING_UTF16BE:
+            case wxFONTENCODING_UTF16LE:
+                *nulLen = 2;
+                return "\0";
+
+            case wxFONTENCODING_UTF32BE:
+            case wxFONTENCODING_UTF32LE:
+                *nulLen = 4;
+                return "\0\0\0";
+
+            default:
+                *nulLen = 1;
+                return "";
+        }
+    }
+
     // were we initialized successfully?
     bool m_ok;
 
     DECLARE_NO_COPY_CLASS(wxMBConv_wxwin)
 };
 
+// make the constructors available for unit testing
+WXDLLIMPEXP_BASE wxMBConv* new_wxMBConv_wxwin( const wxChar* name )
+{
+    wxMBConv_wxwin* result = new wxMBConv_wxwin( name );
+    if ( !result->IsOk() )
+    {
+        delete result;
+        return 0;
+    }
+    return result;
+}
+
 #endif // wxUSE_FONTMAP
 
 // ============================================================================
@@ -2208,7 +2662,11 @@ wxCSConv::wxCSConv(const wxChar *charset)
         SetName(charset);
     }
 
+#if wxUSE_FONTMAP
+    m_encoding = wxFontMapperBase::GetEncodingFromName(charset);
+#else
     m_encoding = wxFONTENCODING_SYSTEM;
+#endif
 }
 
 wxCSConv::wxCSConv(wxFontEncoding encoding)
@@ -2267,12 +2725,29 @@ void wxCSConv::SetName(const wxChar *charset)
     }
 }
 
+#if wxUSE_FONTMAP
+#include "wx/hashmap.h"
+
+WX_DECLARE_HASH_MAP( wxFontEncoding, wxString, wxIntegerHash, wxIntegerEqual,
+                     wxEncodingNameCache );
+
+static wxEncodingNameCache gs_nameCache;
+#endif
+
 wxMBConv *wxCSConv::DoCreate() const
 {
+#if wxUSE_FONTMAP
+    wxLogTrace(TRACE_STRCONV,
+               wxT("creating conversion for %s"),
+               (m_name ? m_name
+                       : wxFontMapperBase::GetEncodingName(m_encoding).c_str()));
+#endif // wxUSE_FONTMAP
+
     // check for the special case of ASCII or ISO8859-1 charset: as we have
     // special knowledge of it anyhow, we don't need to create a special
     // conversion object
-    if ( m_encoding == wxFONTENCODING_ISO8859_1 )
+    if ( m_encoding == wxFONTENCODING_ISO8859_1 ||
+            m_encoding == wxFONTENCODING_DEFAULT )
     {
         // don't convert at all
         return NULL;
@@ -2293,17 +2768,53 @@ wxMBConv *wxCSConv::DoCreate() const
 #endif // !wxUSE_FONTMAP
     {
         wxString name(m_name);
+        wxFontEncoding encoding(m_encoding);
+
+        if ( !name.empty() )
+        {
+            wxMBConv_iconv *conv = new wxMBConv_iconv(name);
+            if ( conv->IsOk() )
+                return conv;
+
+            delete conv;
 
 #if wxUSE_FONTMAP
-        if ( name.empty() )
-            name = wxFontMapper::Get()->GetEncodingName(m_encoding);
+            encoding =
+                wxFontMapperBase::Get()->CharsetToEncoding(name, false);
 #endif // wxUSE_FONTMAP
+        }
+#if wxUSE_FONTMAP
+        {
+            const wxEncodingNameCache::iterator it = gs_nameCache.find(encoding);
+            if ( it != gs_nameCache.end() )
+            {
+                if ( it->second.empty() )
+                    return NULL;
 
-        wxMBConv_iconv *conv = new wxMBConv_iconv(name);
-        if ( conv->IsOk() )
-            return conv;
+                wxMBConv_iconv *conv = new wxMBConv_iconv(it->second);
+                if ( conv->IsOk() )
+                    return conv;
 
-        delete conv;
+                delete conv;
+            }
+
+            const wxChar** names = wxFontMapperBase::GetAllEncodingNames(encoding);
+
+            for ( ; *names; ++names )
+            {
+                wxMBConv_iconv *conv = new wxMBConv_iconv(*names);
+                if ( conv->IsOk() )
+                {
+                    gs_nameCache[encoding] = *names;
+                    return conv;
+                }
+
+                delete conv;
+            }
+
+            gs_nameCache[encoding] = _T(""); // cache the failure
+        }
+#endif // wxUSE_FONTMAP
     }
 #endif // HAVE_ICONV
 
@@ -2323,11 +2834,17 @@ wxMBConv *wxCSConv::DoCreate() const
 #endif // wxHAVE_WIN32_MB2WC
 #if defined(__WXMAC__)
     {
-        if ( m_name || ( m_encoding < wxFONTENCODING_UTF16BE ) )
+        // 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);
+#else
+            wxMBConv_mac *conv = new wxMBConv_mac(m_encoding);
+#endif
             if ( conv->IsOk() )
                  return conv;
 
@@ -2340,8 +2857,12 @@ wxMBConv *wxCSConv::DoCreate() const
         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;
 
@@ -2357,7 +2878,7 @@ wxMBConv *wxCSConv::DoCreate() const
         // use "false" to suppress interactive dialogs -- we can be called from
         // anywhere and popping up a dialog from here is the last thing we want to
         // do
-        enc = wxFontMapper::Get()->CharsetToEncoding(m_name, false);
+        enc = wxFontMapperBase::Get()->CharsetToEncoding(m_name, false);
     }
 #endif // wxUSE_FONTMAP
 
@@ -2413,7 +2934,7 @@ wxMBConv *wxCSConv::DoCreate() const
                    m_name ? m_name
                       :
 #if wxUSE_FONTMAP
-                         wxFontMapper::GetEncodingDescription(m_encoding).c_str()
+                         wxFontMapperBase::GetEncodingDescription(m_encoding).c_str()
 #else // !wxUSE_FONTMAP
                          wxString::Format(_("encoding %s"), m_encoding).c_str()
 #endif // wxUSE_FONTMAP/!wxUSE_FONTMAP
@@ -2493,6 +3014,20 @@ size_t wxCSConv::WC2MB(char *buf, const wchar_t *psz, size_t n) const
     return len;
 }
 
+const char *wxCSConv::GetMBNul(size_t *nulLen) const
+{
+    CreateConvIfNeeded();
+
+    if ( m_convReal )
+    {
+        // cast needed just to call private function of m_convReal
+        return ((wxCSConv *)m_convReal)->GetMBNul(nulLen);
+    }
+
+    *nulLen = 1;
+    return "";
+}
+
 // ----------------------------------------------------------------------------
 // globals
 // ----------------------------------------------------------------------------
@@ -2510,13 +3045,19 @@ static wxCSConv wxConvISO8859_1Obj(wxFONTENCODING_ISO8859_1);
 static wxMBConvUTF7 wxConvUTF7Obj;
 static wxMBConvUTF8 wxConvUTF8Obj;
 
-
 WXDLLIMPEXP_DATA_BASE(wxMBConv&) wxConvLibc = wxConvLibcObj;
 WXDLLIMPEXP_DATA_BASE(wxCSConv&) wxConvLocal = wxConvLocalObj;
 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 *) wxConvFileName = &
+#ifdef __WXOSX__
+                                    wxConvUTF8Obj;
+#else
+                                    wxConvLibcObj;
+#endif
+
 
 #else // !wxUSE_WCHAR_T
 
@@ -2527,5 +3068,3 @@ WXDLLIMPEXP_DATA_BASE(wxMBConv) wxConvLibc,
                                 wxConvUTF8;
 
 #endif // wxUSE_WCHAR_T/!wxUSE_WCHAR_T
-
-