From 40736c5763bf61337c8c14e16d8587db021a87d4 Mon Sep 17 00:00:00 2001 From: Simon Hausmann Date: Fri, 6 Jan 2012 14:44:00 +0100 Subject: Imported WebKit commit 2ea9d364d0f6efa8fa64acf19f451504c59be0e4 (http://svn.webkit.org/repository/webkit/trunk@104285) --- Source/JavaScriptCore/wtf/ArrayBufferView.h | 198 ++++++++++++++++++++++++++++ 1 file changed, 198 insertions(+) create mode 100644 Source/JavaScriptCore/wtf/ArrayBufferView.h (limited to 'Source/JavaScriptCore/wtf/ArrayBufferView.h') diff --git a/Source/JavaScriptCore/wtf/ArrayBufferView.h b/Source/JavaScriptCore/wtf/ArrayBufferView.h new file mode 100644 index 000000000..ccb7fd348 --- /dev/null +++ b/Source/JavaScriptCore/wtf/ArrayBufferView.h @@ -0,0 +1,198 @@ +/* + * 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 "ArrayBuffer.h" + +#include +#include +#include +#include +#include + +namespace WTF { + +class ArrayBufferView : public RefCounted { + public: + virtual bool isByteArray() const { return false; } + virtual bool isUnsignedByteArray() const { return false; } + virtual bool isShortArray() const { return false; } + virtual bool isUnsignedShortArray() const { return false; } + virtual bool isIntArray() const { return false; } + virtual bool isUnsignedIntArray() const { return false; } + virtual bool isFloatArray() const { return false; } + virtual bool isDoubleArray() const { return false; } + virtual bool isDataView() const { return false; } + + PassRefPtr buffer() const + { + return m_buffer; + } + + void* baseAddress() const + { + return m_baseAddress; + } + + unsigned byteOffset() const + { + return m_byteOffset; + } + + virtual unsigned byteLength() const = 0; + + virtual ~ArrayBufferView(); + + protected: + ArrayBufferView(PassRefPtr, 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 + static bool verifySubRange(PassRefPtr 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 + static void clampOffsetAndNumElements(PassRefPtr 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); + } + + 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 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(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(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(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 (end < start) + end = start; + *offset = static_cast(start); + *length = static_cast(end - start); +} + +} // namespace WTF + +using WTF::ArrayBufferView; + +#endif // ArrayBufferView_h -- cgit v1.2.1