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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 <algorithm> | |
| 32 #include <limits.h> | |
| 33 #include <wtf/PassRefPtr.h> | |
| 34 #include <wtf/RefCounted.h> | |
| 35 #include <wtf/RefPtr.h> | |
| 36 | |
| 37 namespace WTF { | |
| 38 | |
| 39 class WTF_EXPORT_PRIVATE_RTTI ArrayBufferView : public RefCounted<ArrayBufferVie
w> { | |
| 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 getType() const = 0; | |
| 54 | |
| 55 PassRefPtr<ArrayBuffer> buffer() const | |
| 56 { | |
| 57 return m_buffer; | |
| 58 } | |
| 59 | |
| 60 void* baseAddress() const | |
| 61 { | |
| 62 return m_baseAddress; | |
| 63 } | |
| 64 | |
| 65 unsigned byteOffset() const | |
| 66 { | |
| 67 return m_byteOffset; | |
| 68 } | |
| 69 | |
| 70 virtual unsigned byteLength() const = 0; | |
| 71 | |
| 72 WTF_EXPORT_PRIVATE_NO_RTTI virtual ~ArrayBufferView(); | |
| 73 | |
| 74 protected: | |
| 75 WTF_EXPORT_PRIVATE_NO_RTTI ArrayBufferView(PassRefPtr<ArrayBuffer>, unsigned
byteOffset); | |
| 76 | |
| 77 inline bool setImpl(ArrayBufferView*, unsigned byteOffset); | |
| 78 | |
| 79 inline bool setRangeImpl(const char* data, size_t dataByteLength, unsigned b
yteOffset); | |
| 80 | |
| 81 inline bool zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength); | |
| 82 | |
| 83 static inline void calculateOffsetAndLength(int start, int end, unsigned arr
aySize, | |
| 84 unsigned* offset, unsigned* length); | |
| 85 | |
| 86 // Helper to verify that a given sub-range of an ArrayBuffer is | |
| 87 // within range. | |
| 88 template <typename T> | |
| 89 static bool verifySubRange(PassRefPtr<ArrayBuffer> buffer, | |
| 90 unsigned byteOffset, | |
| 91 unsigned numElements) | |
| 92 { | |
| 93 if (!buffer) | |
| 94 return false; | |
| 95 if (sizeof(T) > 1 && byteOffset % sizeof(T)) | |
| 96 return false; | |
| 97 if (byteOffset > buffer->byteLength()) | |
| 98 return false; | |
| 99 unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeo
f(T); | |
| 100 if (numElements > remainingElements) | |
| 101 return false; | |
| 102 return true; | |
| 103 } | |
| 104 | |
| 105 // Input offset is in number of elements from this array's view; | |
| 106 // output offset is in number of bytes from the underlying buffer's view. | |
| 107 template <typename T> | |
| 108 static void clampOffsetAndNumElements(PassRefPtr<ArrayBuffer> buffer, | |
| 109 unsigned arrayByteOffset, | |
| 110 unsigned *offset, | |
| 111 unsigned *numElements) | |
| 112 { | |
| 113 unsigned maxOffset = (UINT_MAX - arrayByteOffset) / sizeof(T); | |
| 114 if (*offset > maxOffset) { | |
| 115 *offset = buffer->byteLength(); | |
| 116 *numElements = 0; | |
| 117 return; | |
| 118 } | |
| 119 *offset = arrayByteOffset + *offset * sizeof(T); | |
| 120 *offset = std::min(buffer->byteLength(), *offset); | |
| 121 unsigned remainingElements = (buffer->byteLength() - *offset) / sizeof(T
); | |
| 122 *numElements = std::min(remainingElements, *numElements); | |
| 123 } | |
| 124 | |
| 125 WTF_EXPORT_PRIVATE_NO_RTTI virtual void neuter(); | |
| 126 | |
| 127 // This is the address of the ArrayBuffer's storage, plus the byte offset. | |
| 128 void* m_baseAddress; | |
| 129 | |
| 130 unsigned m_byteOffset; | |
| 131 | |
| 132 private: | |
| 133 friend class ArrayBuffer; | |
| 134 RefPtr<ArrayBuffer> m_buffer; | |
| 135 ArrayBufferView* m_prevView; | |
| 136 ArrayBufferView* m_nextView; | |
| 137 }; | |
| 138 | |
| 139 bool ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset) | |
| 140 { | |
| 141 if (byteOffset > byteLength() | |
| 142 || byteOffset + array->byteLength() > byteLength() | |
| 143 || byteOffset + array->byteLength() < byteOffset) { | |
| 144 // Out of range offset or overflow | |
| 145 return false; | |
| 146 } | |
| 147 | |
| 148 char* base = static_cast<char*>(baseAddress()); | |
| 149 memmove(base + byteOffset, array->baseAddress(), array->byteLength()); | |
| 150 return true; | |
| 151 } | |
| 152 | |
| 153 bool ArrayBufferView::setRangeImpl(const char* data, size_t dataByteLength, unsi
gned byteOffset) | |
| 154 { | |
| 155 if (byteOffset > byteLength() | |
| 156 || byteOffset + dataByteLength > byteLength() | |
| 157 || byteOffset + dataByteLength < byteOffset) { | |
| 158 // Out of range offset or overflow | |
| 159 return false; | |
| 160 } | |
| 161 | |
| 162 char* base = static_cast<char*>(baseAddress()); | |
| 163 memmove(base + byteOffset, data, dataByteLength); | |
| 164 return true; | |
| 165 } | |
| 166 | |
| 167 bool ArrayBufferView::zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength) | |
| 168 { | |
| 169 if (byteOffset > byteLength() | |
| 170 || byteOffset + rangeByteLength > byteLength() | |
| 171 || byteOffset + rangeByteLength < byteOffset) { | |
| 172 // Out of range offset or overflow | |
| 173 return false; | |
| 174 } | |
| 175 | |
| 176 char* base = static_cast<char*>(baseAddress()); | |
| 177 memset(base + byteOffset, 0, rangeByteLength); | |
| 178 return true; | |
| 179 } | |
| 180 | |
| 181 void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arra
ySize, | |
| 182 unsigned* offset, unsigned* lengt
h) | |
| 183 { | |
| 184 if (start < 0) | |
| 185 start += arraySize; | |
| 186 if (start < 0) | |
| 187 start = 0; | |
| 188 if (end < 0) | |
| 189 end += arraySize; | |
| 190 if (end < 0) | |
| 191 end = 0; | |
| 192 if (static_cast<unsigned>(end) > arraySize) | |
| 193 end = arraySize; | |
| 194 if (end < start) | |
| 195 end = start; | |
| 196 *offset = static_cast<unsigned>(start); | |
| 197 *length = static_cast<unsigned>(end - start); | |
| 198 } | |
| 199 | |
| 200 } // namespace WTF | |
| 201 | |
| 202 using WTF::ArrayBufferView; | |
| 203 | |
| 204 #endif // ArrayBufferView_h | |
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Issue 14238015:
Move Source/WTF/wtf to Source/wtf (Closed)
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