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53 lines
1.5 KiB
C++
53 lines
1.5 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_ENGINE_WTF_ARRAYPIECE_H_
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#define SKY_ENGINE_WTF_ARRAYPIECE_H_
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#include "sky/engine/wtf/Forward.h"
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#include "sky/engine/wtf/WTFExport.h"
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namespace WTF {
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// This class is for passing around un-owned bytes as a pointer + length.
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// It supports implicit conversion from several other data types.
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//
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// ArrayPiece has the concept of being "null". This is different from an empty
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// byte range. It is invalid to call methods other than isNull() on such
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// instances.
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//
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// IMPORTANT: The data contained by ArrayPiece is NOT OWNED, so caution must be
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// taken to ensure it is kept alive.
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class WTF_EXPORT ArrayPiece {
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public:
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// Constructs a "null" ArrayPiece object.
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ArrayPiece();
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ArrayPiece(void* data, unsigned byteLength);
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// Constructs an ArrayPiece from the given ArrayBuffer. If the input is a
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// nullptr, then the constructed instance will be isNull().
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ArrayPiece(ArrayBuffer*);
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ArrayPiece(ArrayBufferView*);
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bool isNull() const;
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void* data() const;
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unsigned char* bytes() const;
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unsigned byteLength() const;
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private:
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void initWithData(void* data, unsigned byteLength);
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void initNull();
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void* m_data;
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unsigned m_byteLength;
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bool m_isNull;
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};
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} // namespace WTF
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using WTF::ArrayPiece;
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#endif // SKY_ENGINE_WTF_ARRAYPIECE_H_
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