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author | Steve Block <steveblock@google.com> | 2011-05-06 11:45:16 +0100 |
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committer | Steve Block <steveblock@google.com> | 2011-05-12 13:44:10 +0100 |
commit | cad810f21b803229eb11403f9209855525a25d57 (patch) | |
tree | 29a6fd0279be608e0fe9ffe9841f722f0f4e4269 /Source/WebCore/html/canvas/ArrayBuffer.cpp | |
parent | 121b0cf4517156d0ac5111caf9830c51b69bae8f (diff) | |
download | external_webkit-cad810f21b803229eb11403f9209855525a25d57.zip external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.gz external_webkit-cad810f21b803229eb11403f9209855525a25d57.tar.bz2 |
Merge WebKit at r75315: Initial merge by git.
Change-Id: I570314b346ce101c935ed22a626b48c2af266b84
Diffstat (limited to 'Source/WebCore/html/canvas/ArrayBuffer.cpp')
-rw-r--r-- | Source/WebCore/html/canvas/ArrayBuffer.cpp | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/Source/WebCore/html/canvas/ArrayBuffer.cpp b/Source/WebCore/html/canvas/ArrayBuffer.cpp new file mode 100644 index 0000000..2136f64 --- /dev/null +++ b/Source/WebCore/html/canvas/ArrayBuffer.cpp @@ -0,0 +1,104 @@ +/* + * 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. + */ + +#include "config.h" + +#if ENABLE(3D_CANVAS) || ENABLE(BLOB) + +#include "ArrayBuffer.h" + +#include <wtf/RefPtr.h> + +namespace WebCore { + +PassRefPtr<ArrayBuffer> ArrayBuffer::create(unsigned numElements, unsigned elementByteSize) +{ + void* data = tryAllocate(numElements, elementByteSize); + if (!data) + return 0; + return adoptRef(new ArrayBuffer(data, numElements * elementByteSize)); +} + +PassRefPtr<ArrayBuffer> ArrayBuffer::create(ArrayBuffer* other) +{ + return ArrayBuffer::create(other->data(), other->byteLength()); +} + +PassRefPtr<ArrayBuffer> ArrayBuffer::create(void* source, unsigned byteLength) +{ + void* data = tryAllocate(byteLength, 1); + if (!data) + return 0; + RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(data, byteLength)); + memcpy(buffer->data(), source, byteLength); + return buffer.release(); +} + +ArrayBuffer::ArrayBuffer(void* data, unsigned sizeInBytes) + : m_sizeInBytes(sizeInBytes) + , m_data(data) +{ +} + +void* ArrayBuffer::data() +{ + return m_data; +} + +const void* ArrayBuffer::data() const +{ + return m_data; +} + +unsigned ArrayBuffer::byteLength() const +{ + return m_sizeInBytes; +} + +ArrayBuffer::~ArrayBuffer() +{ + WTF::fastFree(m_data); +} + +void* ArrayBuffer::tryAllocate(unsigned numElements, unsigned elementByteSize) +{ + void* 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) + return 0; + } + if (WTF::tryFastCalloc(numElements, elementByteSize).getValue(result)) + return result; + return 0; +} + +} + +#endif // ENABLE(3D_CANVAS) || ENABLE(BLOB) |