/*
 * 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

