diff -r 000000000000 -r 4f2f89ce4247 WebCore/html/canvas/ArrayBuffer.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/ArrayBuffer.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,90 @@
+/*
+ * 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)
+
+#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)
+{
+    void* data = tryAllocate(other->byteLength(), 1);
+    if (!data)
+        return 0;
+    RefPtr<ArrayBuffer> buffer = adoptRef(new ArrayBuffer(data, other->byteLength()));
+    memcpy(buffer->data(), other->data(), other->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
+    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)