static CFStringRef getPostScriptName(CFStringRef faceName, HDC dc)
{
const DWORD cMaxNameTableSize = 1024 * 1024;
static HashMap<String, RetainPtr<CFStringRef> > nameMap;
// Check our hash first.
String faceString(faceName);
RetainPtr<CFStringRef> result = nameMap.get(faceString);
if (result)
return result.get();
// We need to obtain the PostScript name from the name table and use it instead,.
DWORD bufferSize = GetFontData(dc, 'eman', 0, NULL, 0); // "name" backwards
if (bufferSize == 0 || bufferSize == GDI_ERROR || bufferSize > cMaxNameTableSize)
return NULL;
Vector<BYTE> bufferVector(bufferSize);
BYTE* buffer = bufferVector.data();
if (GetFontData(dc, 'eman', 0, buffer, bufferSize) == GDI_ERROR)
return NULL;
if (bufferSize < 6)
return NULL;
USHORT numberOfRecords = readBigEndianWord(buffer + 2);
UINT stringsOffset = readBigEndianWord(buffer + 4);
if (bufferSize < stringsOffset)
return NULL;
BYTE* strings = buffer + stringsOffset;
// Now walk each name record looking for a Mac or Windows PostScript name.
UINT offset = 6;
for (int i = 0; i < numberOfRecords; i++) {
if (bufferSize < offset + 12)
return NULL;
USHORT platformID = readBigEndianWord(buffer + offset);
USHORT encodingID = readBigEndianWord(buffer + offset + 2);
USHORT languageID = readBigEndianWord(buffer + offset + 4);
USHORT nameID = readBigEndianWord(buffer + offset + 6);
USHORT length = readBigEndianWord(buffer + offset + 8);
USHORT nameOffset = readBigEndianWord(buffer + offset + 10);
if (platformID == 3 && encodingID == 1 && languageID == 0x409 && nameID == 6) {
// This is a Windows PostScript name and is therefore UTF-16.
// Pass Big Endian as the encoding.
if (bufferSize < stringsOffset + nameOffset + length)
return NULL;
result.adoptCF(CFStringCreateWithBytes(NULL, strings + nameOffset, length, kCFStringEncodingUTF16BE, false));
break;
} else if (platformID == 1 && encodingID == 0 && languageID == 0 && nameID == 6) {
// This is a Mac PostScript name and is therefore ASCII.
// See http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
if (bufferSize < stringsOffset + nameOffset + length)
return NULL;
result.adoptCF(CFStringCreateWithBytes(NULL, strings + nameOffset, length, kCFStringEncodingASCII, false));
break;
}
offset += 12;
}
if (result)
nameMap.set(faceString, result);
return result.get();
}
CString String::utf8(UTF8ConversionMode mode) const
{
unsigned length = this->length();
if (!length)
return CString("", 0);
// Allocate a buffer big enough to hold all the characters
// (an individual UTF-16 UChar can only expand to 3 UTF-8 bytes).
// Optimization ideas, if we find this function is hot:
// * We could speculatively create a CStringBuffer to contain 'length'
// characters, and resize if necessary (i.e. if the buffer contains
// non-ascii characters). (Alternatively, scan the buffer first for
// ascii characters, so we know this will be sufficient).
// * We could allocate a CStringBuffer with an appropriate size to
// have a good chance of being able to write the string into the
// buffer without reallocing (say, 1.5 x length).
if (length > std::numeric_limits<unsigned>::max() / 3)
return CString();
Vector<char, 1024> bufferVector(length * 3);
char* buffer = bufferVector.data();
if (is8Bit()) {
const LChar* characters = this->characters8();
ConversionResult result = convertLatin1ToUTF8(&characters, characters + length, &buffer, buffer + bufferVector.size());
ASSERT_UNUSED(result, result != targetExhausted); // (length * 3) should be sufficient for any conversion
} else {
const UChar* characters = this->characters16();
if (mode == StrictUTF8ConversionReplacingUnpairedSurrogatesWithFFFD) {
const UChar* charactersEnd = characters + length;
char* bufferEnd = buffer + bufferVector.size();
while (characters < charactersEnd) {
// Use strict conversion to detect unpaired surrogates.
ConversionResult result = convertUTF16ToUTF8(&characters, charactersEnd, &buffer, bufferEnd, true);
ASSERT(result != targetExhausted);
// Conversion fails when there is an unpaired surrogate. Put
// replacement character (U+FFFD) instead of the unpaired
// surrogate.
if (result != conversionOK) {
ASSERT((0xD800 <= *characters && *characters <= 0xDFFF));
// There should be room left, since one UChar hasn't been
// converted.
ASSERT((buffer + 3) <= bufferEnd);
putUTF8Triple(buffer, replacementCharacter);
++characters;
}
}
} else {
bool strict = mode == StrictUTF8Conversion;
ConversionResult result = convertUTF16ToUTF8(&characters, characters + length, &buffer, buffer + bufferVector.size(), strict);
ASSERT(result != targetExhausted); // (length * 3) should be sufficient for any conversion
// Only produced from strict conversion.
if (result == sourceIllegal) {
ASSERT(strict);
return CString();
}
// Check for an unconverted high surrogate.
if (result == sourceExhausted) {
if (strict)
return CString();
// This should be one unpaired high surrogate. Treat it the same
// was as an unpaired high surrogate would have been handled in
// the middle of a string with non-strict conversion - which is
// to say, simply encode it to UTF-8.
ASSERT((characters + 1) == (this->characters16() + length));
ASSERT((*characters >= 0xD800) && (*characters <= 0xDBFF));
// There should be room left, since one UChar hasn't been
// converted.
ASSERT((buffer + 3) <= (buffer + bufferVector.size()));
putUTF8Triple(buffer, *characters);
}
}
}
return CString(bufferVector.data(), buffer - bufferVector.data());
}
