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diff --git a/Source/WebKit2/Shared/Plugins/NPVariantData.h b/Source/WebKit2/Shared/Plugins/NPVariantData.h
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+++ b/Source/WebKit2/Shared/Plugins/NPVariantData.h
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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.
+ */
+
+#ifndef NPVariantData_h
+#define NPVariantData_h
+
+#if ENABLE(PLUGIN_PROCESS)
+
+#include <wtf/text/CString.h>
+
+namespace CoreIPC {
+    class ArgumentDecoder;
+    class ArgumentEncoder;
+}
+
+namespace WebKit {
+
+// The CoreIPC representation of an NPVariant.
+
+class NPVariantData {
+public:
+    enum Type {
+        Void,
+        Null,
+        Bool,
+        Int32,
+        Double,
+        String,
+        LocalNPObjectID,
+        RemoteNPObjectID,
+    };
+    NPVariantData();
+
+    static NPVariantData makeVoid();
+    static NPVariantData makeNull();
+    static NPVariantData makeBool(bool value);
+    static NPVariantData makeInt32(int32_t value);
+    static NPVariantData makeDouble(double value);
+    static NPVariantData makeString(const char* string, unsigned length);
+    static NPVariantData makeLocalNPObjectID(uint64_t value);
+    static NPVariantData makeRemoteNPObjectID(uint64_t value);
+
+    Type type() const { return static_cast<Type>(m_type); }
+
+    bool boolValue() const
+    {
+        ASSERT(type() == NPVariantData::Bool);
+        return m_boolValue;
+    }
+
+    int32_t int32Value() const
+    {
+        ASSERT(type() == NPVariantData::Int32);
+        return m_int32Value;
+    }
+
+    double doubleValue() const
+    {
+        ASSERT(type() == NPVariantData::Double);
+        return m_doubleValue;
+    }
+
+    const CString& stringValue() const
+    {
+        ASSERT(type() == NPVariantData::String);
+        return m_stringValue;
+    }
+
+    uint64_t localNPObjectIDValue() const
+    {
+        ASSERT(type() == NPVariantData::LocalNPObjectID);
+        return m_localNPObjectIDValue;
+    }
+
+    uint64_t remoteNPObjectIDValue() const
+    {
+        ASSERT(type() == NPVariantData::RemoteNPObjectID);
+        return m_remoteNPObjectIDValue;
+    }
+
+    void encode(CoreIPC::ArgumentEncoder*) const;
+    static bool decode(CoreIPC::ArgumentDecoder*, NPVariantData&);
+
+private:
+    uint32_t m_type;
+    bool m_boolValue;
+    int32_t m_int32Value;
+    double m_doubleValue;
+    CString m_stringValue;
+    uint64_t m_localNPObjectIDValue;
+    uint64_t m_remoteNPObjectIDValue;
+};
+
+} // namespace WebKit
+
+#endif // ENABLE(PLUGIN_PROCESS)
+    
+#endif // NPVariantData_h