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diff --git a/Source/JavaScriptCore/wtf/Decoder.h b/Source/JavaScriptCore/wtf/Decoder.h
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+/*
+ * Copyright (C) 2011 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. ``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
+ * 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 Decoder_h
+#define Decoder_h
+
+#include <wtf/Vector.h>
+
+namespace WTF {
+
+class String;
+
+class Decoder {
+protected:
+    Decoder() { }
+    virtual ~Decoder() { }
+    
+public:
+    virtual bool decodeBytes(Vector<uint8_t>&) = 0;
+
+    virtual bool decodeBool(bool&) = 0;
+    virtual bool decodeUInt32(uint32_t&) = 0;
+    virtual bool decodeUInt64(uint64_t&) = 0;
+    virtual bool decodeInt32(int32_t&) = 0;
+    virtual bool decodeInt64(int64_t&) = 0;
+    virtual bool decodeFloat(float&) = 0;
+    virtual bool decodeDouble(double&) = 0;
+    virtual bool decodeString(String&) = 0;
+};
+
+} // namespace WTF
+
+using WTF::Decoder;
+
+#endif // Decoder_h