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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 THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_PIECE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_PIECE_H_
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/typed_arrays/dom_array_buffer.h"
namespace blink {
class ArrayBufferOrArrayBufferView;
class DOMArrayBufferView;
// This class is for passing around un-owned bytes as a pointer + length.
// It supports implicit conversion from several other data types.
//
// DOMArrayPiece 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 DOMArrayPiece is NOT OWNED, so caution must
// be taken to ensure it is kept alive.
class CORE_EXPORT DOMArrayPiece {
DISALLOW_NEW();
public:
DOMArrayPiece();
DOMArrayPiece(DOMArrayBuffer* buffer);
DOMArrayPiece(DOMArrayBufferView* view);
DOMArrayPiece(const ArrayBufferOrArrayBufferView&);
bool operator==(const DOMArrayBuffer& other) const {
return ByteLengthAsSizeT() == other.ByteLengthAsSizeT() &&
memcmp(Data(), other.Data(), ByteLengthAsSizeT()) == 0;
}
bool IsNull() const;
bool IsDetached() const;
void* Data() const;
unsigned char* Bytes() const;
size_t ByteLengthAsSizeT() const;
private:
void InitWithArrayBuffer(DOMArrayBuffer*);
void InitWithArrayBufferView(DOMArrayBufferView*);
void InitWithData(void* data, size_t byte_length);
void InitNull();
void* data_;
size_t byte_length_;
bool is_null_;
bool is_detached_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_TYPED_ARRAYS_DOM_ARRAY_PIECE_H_