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| 1 /* | |
| 2 * Copyright (C) 2009 Apple Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions | |
| 6 * are met: | |
| 7 * 1. Redistributions of source code must retain the above copyright | |
| 8 * notice, this list of conditions and the following disclaimer. | |
| 9 * 2. Redistributions in binary form must reproduce the above copyright | |
| 10 * notice, this list of conditions and the following disclaimer in the | |
| 11 * documentation and/or other materials provided with the distribution. | |
| 12 * | |
| 13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY | |
| 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
| 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR | |
| 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
| 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY | |
| 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 24 */ | |
| 25 | |
| 26 #ifndef ArrayBufferView_h | |
| 27 #define ArrayBufferView_h | |
| 28 | |
| 29 #include "wtf/ArrayBuffer.h" | |
| 30 | |
| 31 #include "wtf/PassRefPtr.h" | |
| 32 #include "wtf/RefCounted.h" | |
| 33 #include "wtf/RefPtr.h" | |
| 34 #include "wtf/WTFExport.h" | |
| 35 #include <limits.h> | |
| 36 | |
| 37 namespace WTF { | |
| 38 | |
| 39 class WTF_EXPORT ArrayBufferView : public RefCounted<ArrayBufferView> { | |
| 40 public: | |
| 41 enum ViewType { | |
| 42 TypeInt8, | |
| 43 TypeUint8, | |
| 44 TypeUint8Clamped, | |
| 45 TypeInt16, | |
| 46 TypeUint16, | |
| 47 TypeInt32, | |
| 48 TypeUint32, | |
| 49 TypeFloat32, | |
| 50 TypeFloat64, | |
| 51 TypeDataView | |
| 52 }; | |
| 53 virtual ViewType type() const = 0; | |
| 54 const char* typeName(); | |
| 55 | |
| 56 PassRefPtr<ArrayBuffer> buffer() const | |
| 57 { | |
| 58 return m_buffer; | |
| 59 } | |
| 60 | |
| 61 void* baseAddress() const | |
| 62 { | |
| 63 return m_baseAddress; | |
| 64 } | |
| 65 | |
| 66 unsigned byteOffset() const | |
| 67 { | |
| 68 return m_byteOffset; | |
| 69 } | |
| 70 | |
| 71 virtual unsigned byteLength() const = 0; | |
| 72 | |
| 73 void setNeuterable(bool flag) { m_isNeuterable = flag; } | |
| 74 bool isNeuterable() const { return m_isNeuterable; } | |
| 75 bool isShared() const { return m_buffer ? m_buffer->isShared() : false; } | |
| 76 | |
| 77 virtual ~ArrayBufferView(); | |
| 78 | |
| 79 protected: | |
| 80 ArrayBufferView(PassRefPtr<ArrayBuffer>, unsigned byteOffset); | |
| 81 | |
| 82 inline bool setImpl(ArrayBufferView*, unsigned byteOffset); | |
| 83 | |
| 84 // Helper to verify that a given sub-range of an ArrayBuffer is | |
| 85 // within range. | |
| 86 template <typename T> | |
| 87 static bool verifySubRange(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffs
et, unsigned numElements) | |
| 88 { | |
| 89 if (!buffer) | |
| 90 return false; | |
| 91 if (sizeof(T) > 1 && byteOffset % sizeof(T)) | |
| 92 return false; | |
| 93 if (byteOffset > buffer->byteLength()) | |
| 94 return false; | |
| 95 unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeo
f(T); | |
| 96 if (numElements > remainingElements) | |
| 97 return false; | |
| 98 return true; | |
| 99 } | |
| 100 | |
| 101 virtual void neuter(); | |
| 102 | |
| 103 // This is the address of the ArrayBuffer's storage, plus the byte offset. | |
| 104 void* m_baseAddress; | |
| 105 | |
| 106 unsigned m_byteOffset : 31; | |
| 107 bool m_isNeuterable : 1; | |
| 108 | |
| 109 private: | |
| 110 friend class ArrayBuffer; | |
| 111 RefPtr<ArrayBuffer> m_buffer; | |
| 112 ArrayBufferView* m_prevView; | |
| 113 ArrayBufferView* m_nextView; | |
| 114 }; | |
| 115 | |
| 116 bool ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset) | |
| 117 { | |
| 118 if (byteOffset > byteLength() | |
| 119 || byteOffset + array->byteLength() > byteLength() | |
| 120 || byteOffset + array->byteLength() < byteOffset) { | |
| 121 // Out of range offset or overflow | |
| 122 return false; | |
| 123 } | |
| 124 | |
| 125 char* base = static_cast<char*>(baseAddress()); | |
| 126 memmove(base + byteOffset, array->baseAddress(), array->byteLength()); | |
| 127 return true; | |
| 128 } | |
| 129 | |
| 130 } // namespace WTF | |
| 131 | |
| 132 using WTF::ArrayBufferView; | |
| 133 | |
| 134 #endif // ArrayBufferView_h | |
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Chromium Code Reviews
Issue 1875343002:
Move WTF classes related to typed arrays to wtf/typed_arrays (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master