1 /* 2 * Copyright (C) 2009 Apple Inc. All rights reserved. 3 * Copyright (C) 2013 Google Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef ArrayBufferContents_h 28 #define ArrayBufferContents_h 29 30 #include "wtf/ArrayBufferDeallocationObserver.h" 31 #include "wtf/Noncopyable.h" 32 #include "wtf/WTFExport.h" 33 34 namespace WTF { 35 36 class WTF_EXPORT ArrayBufferContents { 37 WTF_MAKE_NONCOPYABLE(ArrayBufferContents); 38 public: 39 enum InitializationPolicy { 40 ZeroInitialize, 41 DontInitialize 42 }; 43 44 ArrayBufferContents(); 45 ArrayBufferContents(unsigned numElements, unsigned elementByteSize, ArrayBufferContents::InitializationPolicy); 46 47 // Use with care. data must be allocated with allocateMemory. 48 // ArrayBufferContents will take ownership of the data and free it (using freeMemorY) 49 // upon destruction. 50 // This constructor will not call observer->StartObserving(), so it is a responsibility 51 // of the caller to make sure JS knows about external memory. 52 ArrayBufferContents(void* data, unsigned sizeInBytes, ArrayBufferDeallocationObserver*); 53 54 ~ArrayBufferContents(); 55 56 void clear(); 57 data()58 void* data() const { return m_data; } sizeInBytes()59 unsigned sizeInBytes() const { return m_sizeInBytes; } 60 setDeallocationObserver(ArrayBufferDeallocationObserver * observer)61 void setDeallocationObserver(ArrayBufferDeallocationObserver* observer) 62 { 63 if (!m_deallocationObserver) { 64 m_deallocationObserver = observer; 65 m_deallocationObserver->blinkAllocatedMemory(m_sizeInBytes); 66 } 67 } 68 69 void transfer(ArrayBufferContents& other); 70 void copyTo(ArrayBufferContents& other); 71 72 static void allocateMemory(size_t, InitializationPolicy, void*&); 73 static void freeMemory(void*, size_t); 74 75 private: 76 void* m_data; 77 unsigned m_sizeInBytes; 78 ArrayBufferDeallocationObserver* m_deallocationObserver; 79 }; 80 81 } // namespace WTF 82 83 #endif // ArrayBufferContents_h 84