--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/canvas/ArrayBufferView.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,80 @@
+/*
+ * 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 "ArrayBufferView.h"
+#include "ArrayBuffer.h"
+
+namespace WebCore {
+
+ArrayBufferView::ArrayBufferView(PassRefPtr<ArrayBuffer> buffer,
+                       unsigned byteOffset)
+        : m_byteOffset(byteOffset)
+        , m_buffer(buffer)
+{
+    m_baseAddress = m_buffer ? (static_cast<char*>(m_buffer->data()) + m_byteOffset) : 0;
+}
+
+ArrayBufferView::~ArrayBufferView()
+{
+}
+
+void ArrayBufferView::setImpl(ArrayBufferView* array, unsigned byteOffset, ExceptionCode& ec)
+{
+    if (byteOffset > byteLength() ||
+        byteOffset + array->byteLength() > byteLength() ||
+        byteOffset + array->byteLength() < byteOffset) {
+        // Out of range offset or overflow
+        ec = INDEX_SIZE_ERR;
+        return;
+    }
+
+    char* base = static_cast<char*>(baseAddress());
+    memmove(base + byteOffset, array->baseAddress(), array->byteLength());
+}
+
+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<unsigned>(start);
+    *length = static_cast<unsigned>(end - start);
+}
+
+}
+
+#endif // ENABLE(3D_CANVAS)