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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef ArrayPiece_h |
| 6 #define ArrayPiece_h |
| 7 |
| 8 #include "wtf/Forward.h" |
| 9 #include "wtf/WTFExport.h" |
| 10 |
| 11 namespace WTF { |
| 12 |
| 13 // This class is for passing around un-owned bytes as a pointer + length. |
| 14 // It supports implicit conversion from several other data types. |
| 15 // |
| 16 // ArrayPiece has the concept of being "null". This is different from an empty |
| 17 // byte range. It is invalid to call methods other than isNull() on such |
| 18 // instances. |
| 19 // |
| 20 // IMPORTANT: The data contained by ArrayPiece is NOT OWNED, so caution must be |
| 21 // taken to ensure it is kept alive. |
| 22 class WTF_EXPORT ArrayPiece { |
| 23 public: |
| 24 // Constructs a "null" ArrayPiece object. |
| 25 ArrayPiece(); |
| 26 |
| 27 ArrayPiece(void* data, unsigned byteLength); |
| 28 |
| 29 // Constructs an ArrayPiece from the given ArrayBuffer. If the input is a |
| 30 // nullptr, then the constructed instance will be isNull(). |
| 31 ArrayPiece(ArrayBuffer*); |
| 32 ArrayPiece(ArrayBufferView*); |
| 33 |
| 34 bool isNull() const; |
| 35 void* data() const; |
| 36 unsigned char* bytes() const; |
| 37 unsigned byteLength() const; |
| 38 |
| 39 private: |
| 40 void initWithData(void* data, unsigned byteLength); |
| 41 void initNull(); |
| 42 |
| 43 void* m_data; |
| 44 unsigned m_byteLength; |
| 45 bool m_isNull; |
| 46 }; |
| 47 |
| 48 } // namespace WTF |
| 49 |
| 50 using WTF::ArrayPiece; |
| 51 |
| 52 #endif // ArrayPiece_h |
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