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| 1 /* | 1 /* |
| 2 * Copyright (C) 2010 Apple Inc. All rights reserved. | 2 * Copyright (C) 2010 Apple Inc. All rights reserved. |
| 3 * Copyright (c) 2010, Google Inc. All rights reserved. | 3 * Copyright (c) 2010, Google Inc. All rights reserved. |
| 4 * | 4 * |
| 5 * Redistribution and use in source and binary forms, with or without | 5 * Redistribution and use in source and binary forms, with or without |
| 6 * modification, are permitted provided that the following conditions | 6 * modification, are permitted provided that the following conditions |
| 7 * are met: | 7 * are met: |
| 8 * 1. Redistributions of source code must retain the above copyright | 8 * 1. Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * 2. Redistributions in binary form must reproduce the above copyright | 10 * 2. Redistributions in binary form must reproduce the above copyright |
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| 68 } | 68 } |
| 69 | 69 |
| 70 // Invoked by the indexed getter. Does not perform range checks; caller | 70 // Invoked by the indexed getter. Does not perform range checks; caller |
| 71 // is responsible for doing so and returning undefined as necessary. | 71 // is responsible for doing so and returning undefined as necessary. |
| 72 T item(unsigned index) const | 72 T item(unsigned index) const |
| 73 { | 73 { |
| 74 ASSERT_WITH_SECURITY_IMPLICATION(index < TypedArrayBase<T>::m_length); | 74 ASSERT_WITH_SECURITY_IMPLICATION(index < TypedArrayBase<T>::m_length); |
| 75 return TypedArrayBase<T>::data()[index]; | 75 return TypedArrayBase<T>::data()[index]; |
| 76 } | 76 } |
| 77 | 77 |
| 78 bool checkInboundData(unsigned offset, unsigned pos) const | |
| 79 { | |
| 80 return (offset <= m_length | |
| 81 && offset + pos <= m_length | |
| 82 // check overflow | |
| 83 && offset + pos >= offset); | |
| 84 } | |
| 85 | |
| 86 protected: | 78 protected: |
| 87 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned
length) | 79 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned
length) |
| 88 : ArrayBufferView(buffer, byteOffset) | 80 : ArrayBufferView(buffer, byteOffset) |
| 89 , m_length(length) | 81 , m_length(length) |
| 90 { | 82 { |
| 91 } | 83 } |
| 92 | 84 |
| 93 template <class Subclass> | 85 template <class Subclass> |
| 94 static PassRefPtr<Subclass> create(unsigned length) | 86 static PassRefPtr<Subclass> create(unsigned length) |
| 95 { | 87 { |
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| 119 | 111 |
| 120 template <class Subclass> | 112 template <class Subclass> |
| 121 static PassRefPtr<Subclass> createOrNull(unsigned length) | 113 static PassRefPtr<Subclass> createOrNull(unsigned length) |
| 122 { | 114 { |
| 123 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createOrNull(length, sizeof(T)
); | 115 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createOrNull(length, sizeof(T)
); |
| 124 if (!buffer) | 116 if (!buffer) |
| 125 return nullptr; | 117 return nullptr; |
| 126 return create<Subclass>(buffer.release(), 0, length); | 118 return create<Subclass>(buffer.release(), 0, length); |
| 127 } | 119 } |
| 128 | 120 |
| 129 template <class Subclass> | |
| 130 static PassRefPtr<Subclass> createUninitialized(unsigned length) | |
| 131 { | |
| 132 RefPtr<ArrayBuffer> buffer = ArrayBuffer::createUninitialized(length, si
zeof(T)); | |
| 133 return create<Subclass>(buffer.release(), 0, length); | |
| 134 } | |
| 135 | |
| 136 template <class Subclass> | |
| 137 PassRefPtr<Subclass> subarrayImpl(int start, int end) const | |
| 138 { | |
| 139 unsigned offset, length; | |
| 140 calculateOffsetAndLength(start, end, m_length, &offset, &length); | |
| 141 clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length); | |
| 142 return create<Subclass>(buffer(), offset, length); | |
| 143 } | |
| 144 | |
| 145 virtual void neuter() override final | 121 virtual void neuter() override final |
| 146 { | 122 { |
| 147 ArrayBufferView::neuter(); | 123 ArrayBufferView::neuter(); |
| 148 m_length = 0; | 124 m_length = 0; |
| 149 } | 125 } |
| 150 | 126 |
| 151 // We do not want to have to access this via a virtual function in subclasse
s, | 127 // We do not want to have to access this via a virtual function in subclasse
s, |
| 152 // which is why it is protected rather than private. | 128 // which is why it is protected rather than private. |
| 153 unsigned m_length; | 129 unsigned m_length; |
| 154 }; | 130 }; |
| 155 | 131 |
| 156 } // namespace WTF | 132 } // namespace WTF |
| 157 | 133 |
| 158 using WTF::TypedArrayBase; | 134 using WTF::TypedArrayBase; |
| 159 | 135 |
| 160 #endif // TypedArrayBase_h | 136 #endif // TypedArrayBase_h |
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