third_party/WebKit/Source/core/dom/DecodedDataDocumentParser.cpp

/*
 * Copyright (C) 2010 Google, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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#include "core/dom/DecodedDataDocumentParser.h"

#include "core/dom/Document.h"
#include "core/dom/DocumentEncodingData.h"
#include "core/html/parser/TextResourceDecoder.h"
#include <memory>

namespace blink {

DecodedDataDocumentParser::DecodedDataDocumentParser(Document& document)
    : DocumentParser(&document), m_needsDecoder(true) {}

DecodedDataDocumentParser::~DecodedDataDocumentParser() {}

void DecodedDataDocumentParser::setDecoder(
    std::unique_ptr<TextResourceDecoder> decoder) {
  // If the decoder is explicitly unset rather than having ownership
  // transferred away by takeDecoder(), we need to make sure it's recreated
  // next time data is appended.
  m_needsDecoder = !decoder;
  m_decoder = std::move(decoder);
}

TextResourceDecoder* DecodedDataDocumentParser::decoder() {
  return m_decoder.get();
}

std::unique_ptr<TextResourceDecoder> DecodedDataDocumentParser::takeDecoder() {
  return std::move(m_decoder);
}

void DecodedDataDocumentParser::appendBytes(const char* data, size_t length) {
  if (!length)
    return;

  // This should be checking isStopped(), but XMLDocumentParser prematurely
  // stops parsing when handling an XSLT processing instruction and still
  // needs to receive decoded bytes.
  if (isDetached())
    return;

  String decoded = m_decoder->decode(data, length);
  updateDocument(decoded);
}

void DecodedDataDocumentParser::flush() {
  // This should be checking isStopped(), but XMLDocumentParser prematurely
  // stops parsing when handling an XSLT processing instruction and still
  // needs to receive decoded bytes.
  if (isDetached())
    return;

  // null decoder indicates there is no data received.
  // We have nothing to do in that case.
  if (!m_decoder)
    return;

  String remainingData = m_decoder->flush();
  updateDocument(remainingData);
}

void DecodedDataDocumentParser::updateDocument(String& decodedData) {
  document()->setEncodingData(DocumentEncodingData(*m_decoder.get()));

  if (!decodedData.isEmpty())
    append(decodedData);
}

}  // namespace blink