String TextCodecLatin1::decode(const char* bytes, size_t length, bool, bool, bool&)
{
UChar* characters;
String result = String::createUninitialized(length, characters);
const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
const uint8_t* end = reinterpret_cast<const uint8_t*>(bytes + length);
const uint8_t* alignedEnd = alignToMachineWord(end);
UChar* destination = characters;
while (source < end) {
if (isASCII(*source)) {
// Fast path for ASCII. Most Latin-1 text will be ASCII.
if (isAlignedToMachineWord(source)) {
while (source < alignedEnd) {
MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
if (!isAllASCII<LChar>(chunk))
goto useLookupTable;
copyASCIIMachineWord(destination, source);
source += sizeof(MachineWord);
destination += sizeof(MachineWord);
}
if (source == end)
break;
}
*destination = *source;
} else {
useLookupTable:
*destination = table[*source];
}
++source;
++destination;
}
return result;
}
String TextCodecLatin1::decode(const char* bytes, size_t length, bool, bool, bool&)
{
LChar* characters;
if (!length)
return emptyString();
String result = String::createUninitialized(length, characters);
const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
const uint8_t* end = reinterpret_cast<const uint8_t*>(bytes + length);
const uint8_t* alignedEnd = alignToMachineWord(end);
LChar* destination = characters;
while (source < end) {
if (isASCII(*source)) {
// Fast path for ASCII. Most Latin-1 text will be ASCII.
if (isAlignedToMachineWord(source)) {
while (source < alignedEnd) {
MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
if (!isAllASCII<LChar>(chunk))
goto useLookupTable;
copyASCIIMachineWord(destination, source);
source += sizeof(MachineWord);
destination += sizeof(MachineWord);
}
if (source == end)
break;
}
*destination = *source;
} else {
useLookupTable:
if (table[*source] > 0xff)
goto upConvertTo16Bit;
*destination = table[*source];
}
++source;
++destination;
}
return result;
upConvertTo16Bit:
UChar* characters16;
String result16 = String::createUninitialized(length, characters16);
UChar* destination16 = characters16;
// Zero extend and copy already processed 8 bit data
LChar* ptr8 = characters;
LChar* endPtr8 = destination;
while (ptr8 < endPtr8)
*destination16++ = *ptr8++;
// Handle the character that triggered the 16 bit path
*destination16 = table[*source];
++source;
++destination16;
while (source < end) {
if (isASCII(*source)) {
// Fast path for ASCII. Most Latin-1 text will be ASCII.
if (isAlignedToMachineWord(source)) {
while (source < alignedEnd) {
MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
if (!isAllASCII<LChar>(chunk))
goto useLookupTable16;
copyASCIIMachineWord(destination16, source);
source += sizeof(MachineWord);
destination16 += sizeof(MachineWord);
}
if (source == end)
break;
}
*destination16 = *source;
} else {
useLookupTable16:
*destination16 = table[*source];
}
++source;
++destination16;
}
return result16;
}
String TextCodecUTF8::decode(const char* bytes, size_t length, bool flush, bool stopOnError, bool& sawError)
{
// Each input byte might turn into a character.
// That includes all bytes in the partial-sequence buffer because
// each byte in an invalid sequence will turn into a replacement character.
StringBuffer<LChar> buffer(m_partialSequenceSize + length);
const uint8_t* source = reinterpret_cast<const uint8_t*>(bytes);
const uint8_t* end = source + length;
const uint8_t* alignedEnd = alignToMachineWord(end);
LChar* destination = buffer.characters();
do {
if (m_partialSequenceSize) {
// Explicitly copy destination and source pointers to avoid taking pointers to the
// local variables, which may harm code generation by disabling some optimizations
// in some compilers.
LChar* destinationForHandlePartialSequence = destination;
const uint8_t* sourceForHandlePartialSequence = source;
if (handlePartialSequence(destinationForHandlePartialSequence, sourceForHandlePartialSequence, end, flush, stopOnError, sawError)) {
source = sourceForHandlePartialSequence;
goto upConvertTo16Bit;
}
destination = destinationForHandlePartialSequence;
source = sourceForHandlePartialSequence;
if (m_partialSequenceSize)
break;
}
while (source < end) {
if (isASCII(*source)) {
// Fast path for ASCII. Most UTF-8 text will be ASCII.
if (isAlignedToMachineWord(source)) {
while (source < alignedEnd) {
MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
if (!isAllASCII<LChar>(chunk))
break;
copyASCIIMachineWord(destination, source);
source += sizeof(MachineWord);
destination += sizeof(MachineWord);
}
if (source == end)
break;
if (!isASCII(*source))
continue;
}
*destination++ = *source++;
continue;
}
int count = nonASCIISequenceLength(*source);
int character;
if (!count)
character = nonCharacter;
else {
if (count > end - source) {
ASSERT_WITH_SECURITY_IMPLICATION(end - source < static_cast<ptrdiff_t>(sizeof(m_partialSequence)));
ASSERT(!m_partialSequenceSize);
m_partialSequenceSize = end - source;
memcpy(m_partialSequence, source, m_partialSequenceSize);
source = end;
break;
}
character = decodeNonASCIISequence(source, count);
}
if (character == nonCharacter) {
sawError = true;
if (stopOnError)
break;
goto upConvertTo16Bit;
}
if (character > 0xff)
goto upConvertTo16Bit;
source += count;
*destination++ = character;
}
} while (flush && m_partialSequenceSize);
buffer.shrink(destination - buffer.characters());
return String::adopt(buffer);
upConvertTo16Bit:
StringBuffer<UChar> buffer16(m_partialSequenceSize + length);
UChar* destination16 = buffer16.characters();
// Copy the already converted characters
for (LChar* converted8 = buffer.characters(); converted8 < destination;)
*destination16++ = *converted8++;
do {
if (m_partialSequenceSize) {
// Explicitly copy destination and source pointers to avoid taking pointers to the
// local variables, which may harm code generation by disabling some optimizations
// in some compilers.
UChar* destinationForHandlePartialSequence = destination16;
const uint8_t* sourceForHandlePartialSequence = source;
handlePartialSequence(destinationForHandlePartialSequence, sourceForHandlePartialSequence, end, flush, stopOnError, sawError);
destination16 = destinationForHandlePartialSequence;
source = sourceForHandlePartialSequence;
if (m_partialSequenceSize)
break;
}
while (source < end) {
if (isASCII(*source)) {
// Fast path for ASCII. Most UTF-8 text will be ASCII.
if (isAlignedToMachineWord(source)) {
while (source < alignedEnd) {
MachineWord chunk = *reinterpret_cast_ptr<const MachineWord*>(source);
if (!isAllASCII<LChar>(chunk))
break;
copyASCIIMachineWord(destination16, source);
source += sizeof(MachineWord);
destination16 += sizeof(MachineWord);
}
if (source == end)
break;
if (!isASCII(*source))
continue;
}
*destination16++ = *source++;
continue;
}
int count = nonASCIISequenceLength(*source);
int character;
if (!count)
character = nonCharacter;
else {
if (count > end - source) {
ASSERT_WITH_SECURITY_IMPLICATION(end - source < static_cast<ptrdiff_t>(sizeof(m_partialSequence)));
ASSERT(!m_partialSequenceSize);
m_partialSequenceSize = end - source;
memcpy(m_partialSequence, source, m_partialSequenceSize);
source = end;
break;
}
character = decodeNonASCIISequence(source, count);
}
if (character == nonCharacter) {
sawError = true;
if (stopOnError)
break;
// Each error generates a replacement character and consumes one byte.
*destination16++ = replacementCharacter;
++source;
continue;
}
source += count;
destination16 = appendCharacter(destination16, character);
}
} while (flush && m_partialSequenceSize);
buffer16.shrink(destination16 - buffer16.characters());
return String::adopt(buffer16);
}
