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/ArrayBuffer.h | 220 ++++++++++++++++++++++++++++++++ 1 file changed, 220 insertions(+) create mode 100644 Source/JavaScriptCore/wtf/ArrayBuffer.h (limited to 'Source/JavaScriptCore/wtf/ArrayBuffer.h') diff --git a/Source/JavaScriptCore/wtf/ArrayBuffer.h b/Source/JavaScriptCore/wtf/ArrayBuffer.h new file mode 100644 index 000000000..ee95f5bc6 --- /dev/null +++ b/Source/JavaScriptCore/wtf/ArrayBuffer.h @@ -0,0 +1,220 @@ +/* + * 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 ArrayBuffer_h +#define ArrayBuffer_h + +#include +#include +#include +#include + +namespace WTF { + +class ArrayBuffer; +class ArrayBufferView; + +class ArrayBufferContents { + WTF_MAKE_NONCOPYABLE(ArrayBufferContents); +public: + ArrayBufferContents() + : m_data(0) + , m_sizeInBytes(0) + { } + + inline ~ArrayBufferContents(); + + void* data() { return m_data; } + unsigned sizeInBytes() { return m_sizeInBytes; } + +private: + ArrayBufferContents(void* data, unsigned sizeInBytes) + : m_data(data) + , m_sizeInBytes(sizeInBytes) + { } + + friend class ArrayBuffer; + + static inline void tryAllocate(unsigned numElements, unsigned elementByteSize, ArrayBufferContents&); + void transfer(ArrayBufferContents& other) + { + ASSERT(!other.m_data); + other.m_data = m_data; + other.m_sizeInBytes = m_sizeInBytes; + m_data = 0; + m_sizeInBytes = 0; + } + + void* m_data; + unsigned m_sizeInBytes; +}; + +class ArrayBuffer : public RefCounted { +public: + static inline PassRefPtr create(unsigned numElements, unsigned elementByteSize); + static inline PassRefPtr create(ArrayBuffer*); + static inline PassRefPtr create(const void* source, unsigned byteLength); + static inline PassRefPtr create(ArrayBufferContents&); + + inline void* data(); + inline const void* data() const; + inline unsigned byteLength() const; + + inline PassRefPtr slice(int begin, int end) const; + inline PassRefPtr slice(int begin) const; + + void addView(ArrayBufferView*); + void removeView(ArrayBufferView*); + + bool transfer(ArrayBufferContents&, Vector >& neuteredViews); + bool isNeutered() { return !m_contents.m_data; } + + ~ArrayBuffer() { } + +private: + inline ArrayBuffer(ArrayBufferContents&); + inline PassRefPtr sliceImpl(unsigned begin, unsigned end) const; + inline unsigned clampIndex(int index) const; + static inline int clampValue(int x, int left, int right); + + ArrayBufferContents m_contents; + ArrayBufferView* m_firstView; +}; + +int ArrayBuffer::clampValue(int x, int left, int right) +{ + ASSERT(left <= right); + if (x < left) + x = left; + if (right < x) + x = right; + return x; +} + +PassRefPtr ArrayBuffer::create(unsigned numElements, unsigned elementByteSize) +{ + ArrayBufferContents contents; + ArrayBufferContents::tryAllocate(numElements, elementByteSize, contents); + if (!contents.m_data) + return 0; + return adoptRef(new ArrayBuffer(contents)); +} + +PassRefPtr ArrayBuffer::create(ArrayBuffer* other) +{ + return ArrayBuffer::create(other->data(), other->byteLength()); +} + +PassRefPtr ArrayBuffer::create(const void* source, unsigned byteLength) +{ + ArrayBufferContents contents; + ArrayBufferContents::tryAllocate(byteLength, 1, contents); + if (!contents.m_data) + return 0; + RefPtr buffer = adoptRef(new ArrayBuffer(contents)); + memcpy(buffer->data(), source, byteLength); + return buffer.release(); +} + +PassRefPtr ArrayBuffer::create(ArrayBufferContents& contents) +{ + return adoptRef(new ArrayBuffer(contents)); +} + +ArrayBuffer::ArrayBuffer(ArrayBufferContents& contents) + : m_firstView(0) +{ + contents.transfer(m_contents); +} + +void* ArrayBuffer::data() +{ + return m_contents.m_data; +} + +const void* ArrayBuffer::data() const +{ + return m_contents.m_data; +} + +unsigned ArrayBuffer::byteLength() const +{ + return m_contents.m_sizeInBytes; +} + +PassRefPtr ArrayBuffer::slice(int begin, int end) const +{ + return sliceImpl(clampIndex(begin), clampIndex(end)); +} + +PassRefPtr ArrayBuffer::slice(int begin) const +{ + return sliceImpl(clampIndex(begin), byteLength()); +} + +PassRefPtr ArrayBuffer::sliceImpl(unsigned begin, unsigned end) const +{ + unsigned size = begin <= end ? end - begin : 0; + return ArrayBuffer::create(static_cast(data()) + begin, size); +} + +unsigned ArrayBuffer::clampIndex(int index) const +{ + unsigned currentLength = byteLength(); + if (index < 0) + index = currentLength + index; + return clampValue(index, 0, currentLength); +} + +void ArrayBufferContents::tryAllocate(unsigned numElements, unsigned elementByteSize, ArrayBufferContents& result) +{ + // Do not allow 32-bit overflow of the total size. + // FIXME: Why not? The tryFastCalloc function already checks its arguments, + // and will fail if there is any overflow, so why should we include a + // redudant unnecessarily restrictive check here? + if (numElements) { + unsigned totalSize = numElements * elementByteSize; + if (totalSize / numElements != elementByteSize) { + result.m_data = 0; + return; + } + } + if (WTF::tryFastCalloc(numElements, elementByteSize).getValue(result.m_data)) { + result.m_sizeInBytes = numElements * elementByteSize; + return; + } + result.m_data = 0; +} + +ArrayBufferContents::~ArrayBufferContents() +{ + WTF::fastFree(m_data); +} + +} // namespace WTF + +using WTF::ArrayBuffer; + +#endif // ArrayBuffer_h -- cgit v1.2.1