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/*
* Copyright (C) 2016-2024 Apple 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,
* 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 "TextDecoder.h"
#include <pal/text/TextCodec.h>
#include <pal/text/TextEncodingRegistry.h>
#include <wtf/text/MakeString.h>
namespace WebCore {
TextDecoder::TextDecoder(StringView label, Options options)
: m_textEncoding(label)
, m_options(options)
{
}
TextDecoder::~TextDecoder() = default;
ExceptionOr<Ref<TextDecoder>> TextDecoder::create(const String& label, Options options)
{
auto trimmedLabel = label.trim(isASCIIWhitespace);
const UChar nullCharacter = '\0';
if (trimmedLabel.contains(nullCharacter))
return Exception { ExceptionCode::RangeError };
auto decoder = adoptRef(*new TextDecoder(trimmedLabel, options));
if (!decoder->m_textEncoding.isValid() || decoder->m_textEncoding.name() == "replacement"_s)
return Exception { ExceptionCode::RangeError };
return decoder;
}
ExceptionOr<String> TextDecoder::decode(std::optional<BufferSource::VariantType> input, DecodeOptions options)
{
std::optional<BufferSource> inputBuffer;
std::span<const uint8_t> data;
if (input) {
inputBuffer = BufferSource(WTFMove(input.value()));
data = inputBuffer->span();
}
if (!m_codec) {
m_codec = newTextCodec(m_textEncoding);
if (!m_options.ignoreBOM)
m_codec->stripByteOrderMark();
}
m_decodedBytes += data.size();
if (m_decodedBytes > String::MaxLength)
return Exception { ExceptionCode::RangeError };
bool sawError = false;
String result = m_codec->decode(data, !options.stream, m_options.fatal, sawError);
if (!options.stream && !m_options.ignoreBOM)
m_codec->stripByteOrderMark();
if (sawError && m_options.fatal)
return Exception { ExceptionCode::TypeError };
return result;
}
String TextDecoder::encoding() const
{
return StringView(m_textEncoding.name()).convertToASCIILowercase();
}
}
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