| /* |
| * Copyright (C) 2009 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef ArrayBufferView_h |
| #define ArrayBufferView_h |
| |
| #include <wtf/ArrayBuffer.h> |
| |
| #include <algorithm> |
| #include <limits.h> |
| #include <wtf/PassRefPtr.h> |
| #include <wtf/RefCounted.h> |
| #include <wtf/RefPtr.h> |
| |
| namespace WTF { |
| |
| class WTF_EXPORT_PRIVATE_RTTI ArrayBufferView : public RefCounted<ArrayBufferView> { |
| public: |
| enum ViewType { |
| TypeInt8, |
| TypeUint8, |
| TypeUint8Clamped, |
| TypeInt16, |
| TypeUint16, |
| TypeInt32, |
| TypeUint32, |
| TypeFloat32, |
| TypeFloat64, |
| TypeDataView |
| }; |
| virtual ViewType getType() const = 0; |
| |
| PassRefPtr<ArrayBuffer> buffer() const |
| { |
| return m_buffer; |
| } |
| |
| void* baseAddress() const |
| { |
| return m_baseAddress; |
| } |
| |
| unsigned byteOffset() const |
| { |
| return m_byteOffset; |
| } |
| |
| virtual unsigned byteLength() const = 0; |
| |
| WTF_EXPORT_PRIVATE_NO_RTTI virtual ~ArrayBufferView(); |
| |
| protected: |
| WTF_EXPORT_PRIVATE_NO_RTTI ArrayBufferView(PassRefPtr<ArrayBuffer>, unsigned byteOffset); |
| |
| inline bool setImpl(ArrayBufferView*, unsigned byteOffset); |
| |
| inline bool setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset); |
| |
| inline bool zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength); |
| |
| static inline void calculateOffsetAndLength(int start, int end, unsigned arraySize, |
| unsigned* offset, unsigned* length); |
| |
| // Helper to verify that a given sub-range of an ArrayBuffer is |
| // within range. |
| template <typename T> |
| static bool verifySubRange(PassRefPtr<ArrayBuffer> buffer, |
| unsigned byteOffset, |
| unsigned numElements) |
| { |
| if (!buffer) |
| return false; |
| if (sizeof(T) > 1 && byteOffset % sizeof(T)) |
| return false; |
| if (byteOffset > buffer->byteLength()) |
| return false; |
| unsigned remainingElements = (buffer->byteLength() - byteOffset) / sizeof(T); |
| if (numElements > remainingElements) |
| return false; |
| return true; |
| } |
| |
| // Input offset is in number of elements from this array's view; |
| // output offset is in number of bytes from the underlying buffer's view. |
| template <typename T> |
| static void clampOffsetAndNumElements(PassRefPtr<ArrayBuffer> buffer, |
| unsigned arrayByteOffset, |
| unsigned *offset, |
| unsigned *numElements) |
| { |
| unsigned maxOffset = (UINT_MAX - arrayByteOffset) / sizeof(T); |
| if (*offset > maxOffset) { |
| *offset = buffer->byteLength(); |
| *numElements = 0; |
| return; |
| } |
| *offset = arrayByteOffset + *offset * sizeof(T); |
| *offset = std::min(buffer->byteLength(), *offset); |
| unsigned remainingElements = (buffer->byteLength() - *offset) / sizeof(T); |
| *numElements = std::min(remainingElements, *numElements); |
| } |
| |
| WTF_EXPORT_PRIVATE_NO_RTTI virtual void neuter(); |
| |
| // This is the address of the ArrayBuffer's storage, plus the byte offset. |
| void* m_baseAddress; |
| |
| unsigned m_byteOffset; |
| |
| private: |
| friend class ArrayBuffer; |
| RefPtr<ArrayBuffer> m_buffer; |
| ArrayBufferView* m_prevView; |
| ArrayBufferView* m_nextView; |
| }; |
| |
| bool ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset) |
| { |
| if (byteOffset > byteLength() |
| || byteOffset + array->byteLength() > byteLength() |
| || byteOffset + array->byteLength() < byteOffset) { |
| // Out of range offset or overflow |
| return false; |
| } |
| |
| char* base = static_cast<char*>(baseAddress()); |
| memmove(base + byteOffset, array->baseAddress(), array->byteLength()); |
| return true; |
| } |
| |
| bool ArrayBufferView::setRangeImpl(const char* data, size_t dataByteLength, unsigned byteOffset) |
| { |
| if (byteOffset > byteLength() |
| || byteOffset + dataByteLength > byteLength() |
| || byteOffset + dataByteLength < byteOffset) { |
| // Out of range offset or overflow |
| return false; |
| } |
| |
| char* base = static_cast<char*>(baseAddress()); |
| memmove(base + byteOffset, data, dataByteLength); |
| return true; |
| } |
| |
| bool ArrayBufferView::zeroRangeImpl(unsigned byteOffset, size_t rangeByteLength) |
| { |
| if (byteOffset > byteLength() |
| || byteOffset + rangeByteLength > byteLength() |
| || byteOffset + rangeByteLength < byteOffset) { |
| // Out of range offset or overflow |
| return false; |
| } |
| |
| char* base = static_cast<char*>(baseAddress()); |
| memset(base + byteOffset, 0, rangeByteLength); |
| return true; |
| } |
| |
| void ArrayBufferView::calculateOffsetAndLength(int start, int end, unsigned arraySize, |
| unsigned* offset, unsigned* length) |
| { |
| if (start < 0) |
| start += arraySize; |
| if (start < 0) |
| start = 0; |
| if (end < 0) |
| end += arraySize; |
| if (end < 0) |
| end = 0; |
| if (static_cast<unsigned>(end) > arraySize) |
| end = arraySize; |
| if (end < start) |
| end = start; |
| *offset = static_cast<unsigned>(start); |
| *length = static_cast<unsigned>(end - start); |
| } |
| |
| } // namespace WTF |
| |
| using WTF::ArrayBufferView; |
| |
| #endif // ArrayBufferView_h |