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/*
* Copyright (C) 2013-2021 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.
*/
#include "config.h"
#include "DataView.h"
#include "HeapInlines.h"
#include "JSDataView.h"
#include "JSGlobalObjectInlines.h"
namespace JSC {
DataView::DataView(RefPtr<ArrayBuffer>&& buffer, size_t byteOffset, std::optional<size_t> byteLength)
: ArrayBufferView(TypeDataView, WTFMove(buffer), byteOffset, byteLength)
{
}
Ref<DataView> DataView::create(RefPtr<ArrayBuffer>&& buffer, size_t byteOffset, std::optional<size_t> byteLength)
{
return adoptRef(*new DataView(WTFMove(buffer), byteOffset, byteLength));
}
Ref<DataView> DataView::create(RefPtr<ArrayBuffer>&& buffer)
{
size_t byteLength = buffer->byteLength();
return create(WTFMove(buffer), 0, byteLength);
}
RefPtr<DataView> DataView::wrappedAs(Ref<ArrayBuffer>&& buffer, size_t byteOffset, std::optional<size_t> byteLength)
{
ASSERT(byteLength || buffer->isResizableOrGrowableShared());
// We do not check verifySubRangeLength for resizable buffer case since this function is only called from already created JS DataViews.
// It is possible that verifySubRangeLength fails when underlying ArrayBuffer is resized, but it is OK since it will be just recognized as OOB DataView.
if (!buffer->isResizableOrGrowableShared()) {
if (!ArrayBufferView::verifySubRangeLength(buffer->byteLength(), byteOffset, byteLength.value_or(0), 1))
return nullptr;
} else if (buffer->isGrowableShared()) {
// For growable buffer, we extra-check whether byteOffset and length are within maxByteLength.
// This does not hit in normal condition, just extra hardening.
if (!ArrayBufferView::verifySubRangeLength(buffer->maxByteLength().value(), byteOffset, byteLength.value_or(0), 1))
return nullptr;
}
return adoptRef(*new DataView(WTFMove(buffer), byteOffset, byteLength));
}
JSArrayBufferView* DataView::wrapImpl(JSGlobalObject* lexicalGlobalObject, JSGlobalObject* globalObject)
{
return JSDataView::create(
lexicalGlobalObject, globalObject->typedArrayStructure(TypeDataView, isResizableOrGrowableShared()), possiblySharedBuffer(), byteOffsetRaw(),
isAutoLength() ? std::nullopt : std::optional { byteLengthRaw() });
}
} // namespace JSC
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