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/*
* Copyright (C) 2020 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 "TextEncoderStreamEncoder.h"
#include <JavaScriptCore/GenericTypedArrayViewInlines.h>
#include <JavaScriptCore/JSCInlines.h>
#include <JavaScriptCore/JSGenericTypedArrayViewInlines.h>
#include <wtf/unicode/CharacterNames.h>
namespace WebCore {
RefPtr<Uint8Array> TextEncoderStreamEncoder::encode(const String& input)
{
StringView view(input);
if (!view.length())
return nullptr;
Vector<uint8_t> bytes(WTF::checkedProduct<size_t>(view.length() + 1, 3));
size_t bytesWritten = 0;
for (size_t cptr = 0; cptr < view.length(); cptr++) {
// https://encoding.spec.whatwg.org/#convert-code-unit-to-scalar-value
auto token = view[cptr];
if (m_pendingLeadSurrogate) {
auto leadSurrogate = *std::exchange(m_pendingLeadSurrogate, std::nullopt);
if (U16_IS_TRAIL(token)) {
auto codePoint = U16_GET_SUPPLEMENTARY(leadSurrogate, token);
U8_APPEND_UNSAFE(bytes.data(), bytesWritten, codePoint);
continue;
}
U8_APPEND_UNSAFE(bytes.data(), bytesWritten, replacementCharacter);
}
if (U16_IS_LEAD(token)) {
m_pendingLeadSurrogate = token;
continue;
}
if (U16_IS_TRAIL(token)) {
U8_APPEND_UNSAFE(bytes.data(), bytesWritten, replacementCharacter);
continue;
}
U8_APPEND_UNSAFE(bytes.data(), bytesWritten, token);
}
if (!bytesWritten)
return nullptr;
bytes.shrink(bytesWritten);
return Uint8Array::tryCreate(bytes.data(), bytesWritten);
}
RefPtr<Uint8Array> TextEncoderStreamEncoder::flush()
{
if (!m_pendingLeadSurrogate)
return nullptr;
constexpr uint8_t byteSequence[] = { 0xEF, 0xBF, 0xBD };
return Uint8Array::tryCreate(byteSequence, std::size(byteSequence));
}
}
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