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 "ArrayBuffer.h" 31 #include "ArrayBufferView.h" 32 33 namespace WebCore { 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,ExceptionCode & ec)40 void set(TypedArrayBase<T>* array, unsigned offset, ExceptionCode& ec) 41 { 42 setImpl(array, offset * sizeof(T), ec); 43 } 44 setRange(const T * data,size_t dataLength,unsigned offset,ExceptionCode & ec)45 void setRange(const T* data, size_t dataLength, unsigned offset, ExceptionCode& ec) 46 { 47 setRangeImpl(reinterpret_cast<const char*>(data), dataLength * sizeof(T), offset * sizeof(T), ec); 48 } 49 zeroRange(unsigned offset,size_t length,ExceptionCode & ec)50 void zeroRange(unsigned offset, size_t length, ExceptionCode& ec) 51 { 52 zeroRangeImpl(offset * sizeof(T), length * sizeof(T), ec); 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 64 { 65 return m_length * sizeof(T); 66 } 67 68 protected: TypedArrayBase(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)69 TypedArrayBase(PassRefPtr<ArrayBuffer> buffer, unsigned byteOffset, unsigned length) 70 : ArrayBufferView(buffer, byteOffset) 71 , m_length(length) 72 { 73 } 74 75 template <class Subclass> create(unsigned length)76 static PassRefPtr<Subclass> create(unsigned length) 77 { 78 RefPtr<ArrayBuffer> buffer = ArrayBuffer::create(length, sizeof(T)); 79 if (!buffer.get()) 80 return 0; 81 return create<Subclass>(buffer, 0, length); 82 } 83 84 template <class Subclass> create(const T * array,unsigned length)85 static PassRefPtr<Subclass> create(const T* array, unsigned length) 86 { 87 RefPtr<Subclass> a = create<Subclass>(length); 88 if (a) 89 for (unsigned i = 0; i < length; ++i) 90 a->set(i, array[i]); 91 return a; 92 } 93 94 template <class Subclass> create(PassRefPtr<ArrayBuffer> buffer,unsigned byteOffset,unsigned length)95 static PassRefPtr<Subclass> create(PassRefPtr<ArrayBuffer> buffer, 96 unsigned byteOffset, 97 unsigned length) 98 { 99 RefPtr<ArrayBuffer> buf(buffer); 100 if (!verifySubRange<T>(buf, byteOffset, length)) 101 return 0; 102 103 return adoptRef(new Subclass(buf, byteOffset, length)); 104 } 105 106 template <class Subclass> subarrayImpl(int start,int end)107 PassRefPtr<Subclass> subarrayImpl(int start, int end) const 108 { 109 unsigned offset, length; 110 calculateOffsetAndLength(start, end, m_length, &offset, &length); 111 clampOffsetAndNumElements<T>(buffer(), m_byteOffset, &offset, &length); 112 return create<Subclass>(buffer(), offset, length); 113 } 114 115 // We do not want to have to access this via a virtual function in subclasses, 116 // which is why it is protected rather than private. 117 unsigned m_length; 118 }; 119 120 } // namespace WebCore 121 122 #endif // TypedArrayBase_h 123