Example #1
0
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);
    }
}
Example #3
0
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);
    }
}