TextResourceDecoder* DocumentWriter::createDecoderIfNeeded()
{
if (!m_decoder) {
if (Settings* settings = m_frame->settings()) {
m_decoder = TextResourceDecoder::create(m_mimeType,
settings->defaultTextEncodingName(),
settings->usesEncodingDetector());
Frame* parentFrame = m_frame->tree()->parent();
// Set the hint encoding to the parent frame encoding only if
// the parent and the current frames share the security origin.
// We impose this condition because somebody can make a child frame
// containing a carefully crafted html/javascript in one encoding
// that can be mistaken for hintEncoding (or related encoding) by
// an auto detector. When interpreted in the latter, it could be
// an attack vector.
// FIXME: This might be too cautious for non-7bit-encodings and
// we may consider relaxing this later after testing.
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setHintEncoding(parentFrame->document()->decoder());
} else
m_decoder = TextResourceDecoder::create(m_mimeType, String());
Frame* parentFrame = m_frame->tree()->parent();
if (m_encoding.isEmpty()) {
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setEncoding(parentFrame->document()->inputEncoding(), TextResourceDecoder::EncodingFromParentFrame);
} else {
m_decoder->setEncoding(m_encoding,
m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
}
m_frame->document()->setDecoder(m_decoder.get());
}
return m_decoder.get();
}
inline void TextResourceDecoderBuilder::setupEncoding(TextResourceDecoder* decoder, Document* document)
{
LocalFrame* frame = document->frame();
LocalFrame* parentFrame = frame ? frame->tree().parent() : 0;
if (!m_encoding.isEmpty())
decoder->setEncoding(m_encoding.string(), m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
// Set the hint encoding to the parent frame encoding only if
// the parent and the current frames share the security origin.
// We impose this condition because somebody can make a child frameg63
// containing a carefully crafted html/javascript in one encoding
// that can be mistaken for hintEncoding (or related encoding) by
// an auto detector. When interpreted in the latter, it could be
// an attack vector.
// FIXME: This might be too cautious for non-7bit-encodings and
// we may consider relaxing this later after testing.
if (frame && canReferToParentFrameEncoding(frame, parentFrame)) {
if (parentFrame->document()->encodingWasDetectedHeuristically())
decoder->setHintEncoding(parentFrame->document()->encoding());
if (m_encoding.isEmpty())
decoder->setEncoding(parentFrame->document()->inputEncoding().string(), TextResourceDecoder::EncodingFromParentFrame);
}
}
void DocumentWriter::addData(const char* str, int len, bool flush)
{
if (len == 0 && !flush)
return;
if (len == -1)
len = strlen(str);
Tokenizer* tokenizer = m_frame->document()->tokenizer();
if (tokenizer && tokenizer->wantsRawData()) {
if (len > 0)
tokenizer->writeRawData(str, len);
return;
}
if (!m_decoder) {
if (Settings* settings = m_frame->settings()) {
m_decoder = TextResourceDecoder::create(m_mimeType,
settings->defaultTextEncodingName(),
settings->usesEncodingDetector());
Frame* parentFrame = m_frame->tree()->parent();
// Set the hint encoding to the parent frame encoding only if
// the parent and the current frames share the security origin.
// We impose this condition because somebody can make a child frame
// containing a carefully crafted html/javascript in one encoding
// that can be mistaken for hintEncoding (or related encoding) by
// an auto detector. When interpreted in the latter, it could be
// an attack vector.
// FIXME: This might be too cautious for non-7bit-encodings and
// we may consider relaxing this later after testing.
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setHintEncoding(parentFrame->document()->decoder());
} else
m_decoder = TextResourceDecoder::create(m_mimeType, String());
Frame* parentFrame = m_frame->tree()->parent();
if (m_encoding.isEmpty()) {
if (canReferToParentFrameEncoding(m_frame, parentFrame))
m_decoder->setEncoding(parentFrame->document()->inputEncoding(), TextResourceDecoder::EncodingFromParentFrame);
} else {
m_decoder->setEncoding(m_encoding,
m_encodingWasChosenByUser ? TextResourceDecoder::UserChosenEncoding : TextResourceDecoder::EncodingFromHTTPHeader);
}
m_frame->document()->setDecoder(m_decoder.get());
}
String decoded = m_decoder->decode(str, len);
if (flush)
decoded += m_decoder->flush();
if (decoded.isEmpty())
return;
if (!m_receivedData) {
m_receivedData = true;
if (m_decoder->encoding().usesVisualOrdering())
m_frame->document()->setVisuallyOrdered();
m_frame->document()->recalcStyle(Node::Force);
}
if (tokenizer) {
ASSERT(!tokenizer->wantsRawData());
tokenizer->write(decoded, true);
}
}
