1/* 2 * Copyright (C) 2010 Apple Inc. All rights reserved. 3 * Copyright (c) 2010, 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 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 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 TypedArrayBase_h 28#define TypedArrayBase_h 29 30#include "ArrayBuffer.h" 31#include "ArrayBufferView.h" 32 33namespace JSC { 34 35template <typename T> 36class TypedArrayBase : public ArrayBufferView { 37public: 38 T* data() const { return static_cast<T*>(baseAddress()); } 39 40 bool set(TypedArrayBase<T>* array, unsigned offset) 41 { 42 return setImpl(array, offset * sizeof(T)); 43 } 44 45 bool setRange(const T* data, size_t dataLength, unsigned offset) 46 { 47 return setRangeImpl(reinterpret_cast<const char*>(data), dataLength * sizeof(T), offset * sizeof(T)); 48 } 49 50 bool zeroRange(unsigned offset, size_t length) 51 { 52 return zeroRangeImpl(offset * sizeof(T), length * sizeof(T)); 53 } 54 55 // Overridden from ArrayBufferView. This must be public because of 56 // rules about inheritance of members in template classes, and 57 // because it is accessed via pointers to subclasses. 58 unsigned length() const 59 { 60 return m_length; 61 } 62 63 virtual unsigned byteLength() const 64 { 65 return m_length * sizeof(T); 66 } 67 68 // Invoked by the indexed getter. Does not perform range checks; caller 69 // is responsible for doing so and returning undefined as necessary. 70 T item(unsigned index) const 71 { 72 ASSERT_WITH_SECURITY_IMPLICATION(index < TypedArrayBase<T>::m_length); 73 return TypedArrayBase<T>::data()[index]; 74 } 75 76 bool checkInboundData(unsigned offset, unsigned pos) const 77 { 78 return (offset <= m_length 79 && offset + pos <= m_length 80 // check overflow 81 && offset + pos >= offset); 82 } 83 84protected: 85 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length) 86 : ArrayBufferView(buffer, byteOffset) 87 , m_length(length) 88 { 89 } 90 91 template <class Subclass> 92 static PassRefPtr<Subclass> create(unsigned length) 93 { 94 RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T)); 95 if (!buffer.get()) 96 return 0; 97 return create<Subclass>(buffer, 0, length); 98 } 99 100 template <class Subclass> 101 static PassRefPtr<Subclass> create(const T* array, unsigned length) 102 { 103 RefPtr<Subclass> a = create<Subclass>(length); 104 if (a) 105 for (unsigned i = 0; i < length; ++i) 106 a->set(i, array[i]); 107 return a; 108 } 109 110 template <class Subclass> 111 static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length) 112 { 113 RefPtr<ArrayBuffer> buf(buffer); 114 if (!verifySubRange<T>(buf, byteOffset, length)) 115 return 0; 116 117 return adoptRef(new Subclass(buf, byteOffset, length)); 118 } 119 120 template <class Subclass> 121 static PassRefPtr<Subclass> createUninitialized(unsigned length) 122 { 123 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T)); 124 if (!buffer.get()) 125 return 0; 126 return create<Subclass>(buffer, 0, length); 127 } 128 129 template <class Subclass> 130 PassRefPtr<Subclass> subarrayImpl(int start, int end) const 131 { 132 unsigned offset, length; 133 calculateOffsetAndLength(start, end, m_length, &offset, &length); 134 clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length); 135 return create<Subclass>(buffer(), offset, length); 136 } 137 138 virtual void neuter() 139 { 140 ArrayBufferView::neuter(); 141 m_length = 0; 142 } 143 144 // We do not want to have to access this via a virtual function in subclasses, 145 // which is why it is protected rather than private. 146 unsigned m_length; 147}; 148 149} // namespace JSC 150 151using JSC::TypedArrayBase; 152 153#endif // TypedArrayBase_h 154