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/*
* Copyright (C) 2013 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:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "modules/encoding/TextDecoder.h"
#include "bindings/core/v8/ExceptionState.h"
#include "core/dom/DOMArrayBuffer.h"
#include "core/dom/DOMArrayBufferView.h"
#include "core/dom/ExceptionCode.h"
#include "wtf/StringExtras.h"
#include "wtf/text/TextEncodingRegistry.h"
namespace blink {
TextDecoder* TextDecoder::create(const String& label, const TextDecoderOptions& options, ExceptionState& exceptionState)
{
WTF::TextEncoding encoding(label);
// The replacement encoding is not valid, but the Encoding API also
// rejects aliases of the replacement encoding.
if (!encoding.isValid() || !strcasecmp(encoding.name(), "replacement")) {
exceptionState.throwRangeError("The encoding label provided ('" + label + "') is invalid.");
return 0;
}
return new TextDecoder(encoding, options.fatal(), options.ignoreBOM());
}
TextDecoder::TextDecoder(const WTF::TextEncoding& encoding, bool fatal, bool ignoreBOM)
: m_encoding(encoding)
, m_codec(newTextCodec(encoding))
, m_fatal(fatal)
, m_ignoreBOM(ignoreBOM)
, m_bomSeen(false)
{
}
TextDecoder::~TextDecoder()
{
}
String TextDecoder::encoding() const
{
String name = String(m_encoding.name()).lower();
// Where possible, encoding aliases should be handled by changes to Chromium's ICU or Blink's WTF.
// The same codec is used, but WTF maintains a different name/identity for these.
if (name == "iso-8859-1" || name == "us-ascii")
return "windows-1252";
return name;
}
String TextDecoder::decode(const BufferSource& input, const TextDecodeOptions& options, ExceptionState& exceptionState)
{
ASSERT(!input.isNull());
if (input.isArrayBufferView()) {
const char* start = static_cast<const char*>(input.getAsArrayBufferView()->baseAddress());
size_t length = input.getAsArrayBufferView()->byteLength();
return decode(start, length, options, exceptionState);
}
ASSERT(input.isArrayBuffer());
const char* start = static_cast<const char*>(input.getAsArrayBuffer()->data());
size_t length = input.getAsArrayBuffer()->byteLength();
return decode(start, length, options, exceptionState);
}
String TextDecoder::decode(const char* start, size_t length, const TextDecodeOptions& options, ExceptionState& exceptionState)
{
WTF::FlushBehavior flush = options.stream() ? WTF::DoNotFlush : WTF::DataEOF;
bool sawError = false;
String s = m_codec->decode(start, length, flush, m_fatal, sawError);
if (m_fatal && sawError) {
exceptionState.throwTypeError("The encoded data was not valid.");
return String();
}
if (!m_ignoreBOM && !m_bomSeen && !s.isEmpty()) {
m_bomSeen = true;
String name(m_encoding.name());
if ((name == "UTF-8" || name == "UTF-16LE" || name == "UTF-16BE") && s[0] == 0xFEFF)
s.remove(0);
}
if (flush)
m_bomSeen = false;
return s;
}
String TextDecoder::decode(ExceptionState& exceptionState)
{
TextDecodeOptions options;
return decode(nullptr, 0, options, exceptionState);
}
} // namespace blink
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