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 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 TypedArrayBase_h 28 #define TypedArrayBase_h 29 30 #include "wtf/ArrayBuffer.h" 31 #include "wtf/ArrayBufferView.h" 32 33 namespace WTF { 34 35 template <typename T> 36 class TypedArrayBase : public ArrayBufferView { 37 public: data()38 T* data() const { return static_cast<T*>(baseAddress()); } 39 set(TypedArrayBase<T> * array,unsigned offset)40 bool set(TypedArrayBase<T>* array, unsigned offset) 41 { 42 return setImpl(array, offset * sizeof(T)); 43 } 44 setRange(const T * data,size_t dataLength,unsigned offset)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 zeroRange(unsigned offset,size_t length)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. length()58 unsigned length() const 59 { 60 return m_length; 61 } 62 byteLength()63 virtual unsigned byteLength() const OVERRIDE FINAL 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. item(unsigned index)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 checkInboundData(unsigned offset,unsigned pos)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 84 protected: TypedArrayBase(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)85 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length) 86 : ArrayBufferView(buffer, byteOffset) 87 , m_length(length) 88 { 89 } 90 91 template <class Subclass> create(unsigned length)92 static PassRefPtr<Subclass> create(unsigned length) 93 { 94 RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T)); 95 if (!buffer.get()) 96 return nullptr; 97 return create<Subclass>(buffer, 0, length); 98 } 99 100 template <class Subclass> create(const T * array,unsigned length)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> create(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)111 static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer, 112 unsigned byteOffset, 113 unsigned length) 114 { 115 RefPtr<ArrayBuffer> buf(buffer); 116 if (!verifySubRange<T>(buf, byteOffset, length)) 117 return nullptr; 118 119 return adoptRef(new Subclass(buf, byteOffset, length)); 120 } 121 122 template <class Subclass> createUninitialized(unsigned length)123 static PassRefPtr<Subclass> createUninitialized(unsigned length) 124 { 125 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, sizeof(T)); 126 if (!buffer.get()) 127 return nullptr; 128 return create<Subclass>(buffer, 0, length); 129 } 130 131 template <class Subclass> subarrayImpl(int start,int end)132 PassRefPtr<Subclass> subarrayImpl(int start, int end) const 133 { 134 unsigned offset, length; 135 calculateOffsetAndLength(start, end, m_length, &offset, &length); 136 clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length); 137 return create<Subclass>(buffer(), offset, length); 138 } 139 neuter()140 virtual void neuter() OVERRIDE FINAL 141 { 142 ArrayBufferView::neuter(); 143 m_length = 0; 144 } 145 146 // We do not want to have to access this via a virtual function in subclasses, 147 // which is why it is protected rather than private. 148 unsigned m_length; 149 }; 150 151 } // namespace WTF 152 153 using WTF::TypedArrayBase; 154 155 #endif // TypedArrayBase_h 156