mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2025-04-08 18:01:37 +00:00
90 lines
3.2 KiB
C++
90 lines
3.2 KiB
C++
/*
|
|
* Copyright (C) 2013-2017 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 AND ITS 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 APPLE OR ITS 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.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "ArrayBufferView.h"
|
|
#include <wtf/FlipBytes.h>
|
|
|
|
namespace JSC {
|
|
|
|
class DataView final : public ArrayBufferView {
|
|
public:
|
|
JS_EXPORT_PRIVATE static Ref<DataView> create(RefPtr<ArrayBuffer>&&, unsigned byteOffset, unsigned length);
|
|
static Ref<DataView> create(RefPtr<ArrayBuffer>&&);
|
|
|
|
TypedArrayType getType() const final
|
|
{
|
|
return TypeDataView;
|
|
}
|
|
|
|
JSArrayBufferView* wrap(JSGlobalObject*, JSGlobalObject*) final;
|
|
|
|
template<typename T>
|
|
T get(unsigned offset, bool littleEndian, bool* status = nullptr)
|
|
{
|
|
if (status) {
|
|
if (offset + sizeof(T) > byteLength()) {
|
|
*status = false;
|
|
return T();
|
|
}
|
|
*status = true;
|
|
} else
|
|
RELEASE_ASSERT(offset + sizeof(T) <= byteLength());
|
|
return flipBytesIfLittleEndian(
|
|
*reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress.get(byteLength())) + offset),
|
|
littleEndian);
|
|
}
|
|
|
|
template<typename T>
|
|
T read(unsigned& offset, bool littleEndian, bool* status = nullptr)
|
|
{
|
|
T result = this->template get<T>(offset, littleEndian, status);
|
|
if (!status || *status)
|
|
offset += sizeof(T);
|
|
return result;
|
|
}
|
|
|
|
template<typename T>
|
|
void set(unsigned offset, T value, bool littleEndian, bool* status = nullptr)
|
|
{
|
|
if (status) {
|
|
if (offset + sizeof(T) > byteLength()) {
|
|
*status = false;
|
|
return;
|
|
}
|
|
*status = true;
|
|
} else
|
|
RELEASE_ASSERT(offset + sizeof(T) <= byteLength());
|
|
*reinterpret_cast<T*>(static_cast<uint8_t*>(m_baseAddress.get(byteLength())) + offset) =
|
|
flipBytesIfLittleEndian(value, littleEndian);
|
|
}
|
|
|
|
private:
|
|
DataView(RefPtr<ArrayBuffer>&&, unsigned byteOffset, unsigned byteLength);
|
|
};
|
|
|
|
} // namespace JSC
|