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diff --git a/Source/WebKit2/Platform/CoreIPC/Attachment.cpp b/Source/WebKit2/Platform/CoreIPC/Attachment.cpp
new file mode 100644
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+++ b/Source/WebKit2/Platform/CoreIPC/Attachment.cpp
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+/*
+ * Copyright (C) 2010 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 INC. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "Attachment.h"
+
+#include "ArgumentDecoder.h"
+#include "ArgumentEncoder.h"
+
+namespace CoreIPC {
+
+Attachment::Attachment()
+    : m_type(Uninitialized)
+{
+}
+
+#if PLATFORM(MAC)
+Attachment::Attachment(mach_port_name_t port, mach_msg_type_name_t disposition)
+    : m_type(MachPortType)
+{
+    m_port.port = port;
+    m_port.disposition = disposition;
+}
+
+Attachment::Attachment(void* address, mach_msg_size_t size, mach_msg_copy_options_t copyOptions, bool deallocate)
+    : m_type(MachOOLMemoryType)
+{
+    m_oolMemory.address = address;
+    m_oolMemory.size = size;
+    m_oolMemory.copyOptions = copyOptions;
+    m_oolMemory.deallocate = deallocate;
+}
+
+void Attachment::release()
+{
+    m_type = Uninitialized;
+}
+#endif
+
+void Attachment::encode(ArgumentEncoder* encoder) const
+{
+    encoder->addAttachment(*this);
+}
+
+bool Attachment::decode(ArgumentDecoder* decoder, Attachment& attachment)
+{
+    if (!decoder->removeAttachment(attachment))
+        return false;
+    return true;
+}
+
+} // namespace CoreIPC