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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef DOMArrayPiece_h
#define DOMArrayPiece_h
#include "core/typed_arrays/DOMArrayBuffer.h"
#include "core/typed_arrays/DOMArrayBufferView.h"
#include "platform/wtf/typed_arrays/ArrayPiece.h"
namespace blink {
class ArrayBufferOrArrayBufferView;
// This class is for passing around un-owned bytes as a pointer + length.
// It supports implicit conversion from several other data types.
// ArrayPiece has the concept of being "null". This is different from an empty
// byte range. It is invalid to call methods other than isNull() on such
// instances.
// IMPORTANT: The data contained by ArrayPiece is NOT OWNED, so caution must be
// taken to ensure it is kept alive.
class CORE_EXPORT DOMArrayPiece : public WTF::ArrayPiece {
enum InitWithUnionOption {
// Initialize this object as "null" when initialized with an union which
// holds null.
// Initialize this object so this points to null pointer with zero size
// when initialized with an union which holds null.
DOMArrayPiece() = default;
DOMArrayPiece(DOMArrayBuffer* buffer) : ArrayPiece(buffer->Buffer()) {}
DOMArrayPiece(DOMArrayBufferView* view) : ArrayPiece(view->View()) {}
DOMArrayPiece(const ArrayBufferOrArrayBufferView&,
InitWithUnionOption = kTreatNullAsNull);
bool operator==(const DOMArrayBuffer& other) const {
return ByteLength() == other.ByteLength() &&
memcmp(Data(), other.Data(), ByteLength()) == 0;
bool operator==(const DOMArrayBufferView& other) const {
return ByteLength() == other.byteLength() &&
memcmp(Data(), other.BaseAddress(), ByteLength()) == 0;
} // namespace blink
#endif // DOMArrayPiece_h