ConversionResult convertUTF8ToUTF16(
const char** sourceStart, const char* sourceEnd,
UChar** targetStart, UChar* targetEnd, bool strict)
{
ConversionResult result = conversionOK;
const char* source = *sourceStart;
UChar* target = *targetStart;
while (source < sourceEnd) {
int utf8SequenceLength = inlineUTF8SequenceLength(*source);
if (sourceEnd - source < utf8SequenceLength) {
result = sourceExhausted;
break;
}
// Do this check whether lenient or strict
if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(source), utf8SequenceLength)) {
result = sourceIllegal;
break;
}
UChar32 character = readUTF8Sequence(source, utf8SequenceLength);
if (target >= targetEnd) {
source -= utf8SequenceLength; // Back up source pointer!
result = targetExhausted;
break;
}
if (U_IS_BMP(character)) {
// UTF-16 surrogate values are illegal in UTF-32
if (U_IS_SURROGATE(character)) {
if (strict) {
source -= utf8SequenceLength; // return to the illegal value itself
result = sourceIllegal;
break;
} else
*target++ = replacementCharacter;
} else
*target++ = character; // normal case
} else if (U_IS_SUPPLEMENTARY(character)) {
// target is a character in range 0xFFFF - 0x10FFFF
if (target + 1 >= targetEnd) {
source -= utf8SequenceLength; // Back up source pointer!
result = targetExhausted;
break;
}
*target++ = U16_LEAD(character);
*target++ = U16_TRAIL(character);
} else {
if (strict) {
source -= utf8SequenceLength; // return to the start
result = sourceIllegal;
break; // Bail out; shouldn't continue
} else
*target++ = replacementCharacter;
}
}
*sourceStart = source;
*targetStart = target;
return result;
}
unsigned calculateStringHashAndLengthFromUTF8MaskingTop8Bits(const char* data, const char* dataEnd, unsigned& dataLength, unsigned& utf16Length)
{
if (!data)
return 0;
StringHasher stringHasher;
dataLength = 0;
utf16Length = 0;
while (data < dataEnd || (!dataEnd && *data)) {
if (isASCII(*data)) {
stringHasher.addCharacter(*data++);
dataLength++;
utf16Length++;
continue;
}
int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*data);
dataLength += utf8SequenceLength;
if (!dataEnd) {
for (int i = 1; i < utf8SequenceLength; ++i) {
if (!data[i])
return 0;
}
} else if (dataEnd - data < utf8SequenceLength) {
return 0;
}
if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(data), utf8SequenceLength))
return 0;
UChar32 character = readUTF8Sequence(data, utf8SequenceLength);
ASSERT(!isASCII(character));
if (U_IS_BMP(character)) {
// UTF-16 surrogate values are illegal in UTF-32
if (U_IS_SURROGATE(character))
return 0;
stringHasher.addCharacter(static_cast<UChar>(character)); // normal case
utf16Length++;
} else if (U_IS_SUPPLEMENTARY(character)) {
stringHasher.addCharacters(static_cast<UChar>(U16_LEAD(character)), static_cast<UChar>(U16_TRAIL(character)));
utf16Length += 2;
} else {
return 0;
}
}
return stringHasher.hashWithTop8BitsMasked();
}
unsigned calculateStringHashFromUTF8(const char* data, const char* dataEnd, unsigned& utf16Length)
{
if (!data)
return 0;
WTF::StringHasher stringHasher;
utf16Length = 0;
while (data < dataEnd) {
if (isASCII(*data)) {
stringHasher.addCharacter(*data++);
utf16Length++;
continue;
}
int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*data);
if (dataEnd - data < utf8SequenceLength)
return false;
if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(data), utf8SequenceLength))
return 0;
UChar32 character = readUTF8Sequence(data, utf8SequenceLength);
ASSERT(!isASCII(character));
if (U_IS_BMP(character)) {
// UTF-16 surrogate values are illegal in UTF-32
if (U_IS_SURROGATE(character))
return 0;
stringHasher.addCharacter(static_cast<UChar>(character)); // normal case
utf16Length++;
} else if (U_IS_SUPPLEMENTARY(character)) {
stringHasher.addCharacters(static_cast<UChar>(U16_LEAD(character)),
static_cast<UChar>(U16_TRAIL(character)));
utf16Length += 2;
} else
return 0;
}
return stringHasher.hash();
}
ALWAYS_INLINE bool equalWithUTF8Internal(const CharType* a, const CharType* aEnd, const char* b, const char* bEnd)
{
while (b < bEnd) {
if (isASCII(*b)) {
if (*a++ != *b++)
return false;
continue;
}
int utf8SequenceLength = inlineUTF8SequenceLengthNonASCII(*b);
if (bEnd - b < utf8SequenceLength)
return false;
if (!isLegalUTF8(reinterpret_cast<const unsigned char*>(b), utf8SequenceLength))
return 0;
UChar32 character = readUTF8Sequence(b, utf8SequenceLength);
ASSERT(!isASCII(character));
if (U_IS_BMP(character)) {
// UTF-16 surrogate values are illegal in UTF-32
if (U_IS_SURROGATE(character))
return false;
if (*a++ != character)
return false;
} else if (U_IS_SUPPLEMENTARY(character)) {
if (*a++ != U16_LEAD(character))
return false;
if (*a++ != U16_TRAIL(character))
return false;
} else {
return false;
}
}
return a == aEnd;
}
