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diff --git a/Source/JavaScriptCore/API/OpaqueJSString.h b/Source/JavaScriptCore/API/OpaqueJSString.h
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+++ b/Source/JavaScriptCore/API/OpaqueJSString.h
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+/*
+ * Copyright (C) 2008 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. 
+ */
+
+#ifndef OpaqueJSString_h
+#define OpaqueJSString_h
+
+#include <runtime/UString.h>
+
+namespace JSC {
+    class Identifier;
+    class JSGlobalData;
+}
+
+struct OpaqueJSString : public ThreadSafeShared<OpaqueJSString> {
+
+    static PassRefPtr<OpaqueJSString> create() // null
+    {
+        return adoptRef(new OpaqueJSString);
+    }
+
+    static PassRefPtr<OpaqueJSString> create(const UChar* characters, unsigned length)
+    {
+        return adoptRef(new OpaqueJSString(characters, length));
+    }
+
+    static PassRefPtr<OpaqueJSString> create(const JSC::UString&);
+
+    UChar* characters() { return this ? m_characters : 0; }
+    unsigned length() { return this ? m_length : 0; }
+
+    JSC::UString ustring() const;
+    JSC::Identifier identifier(JSC::JSGlobalData*) const;
+
+private:
+    friend class WTF::ThreadSafeShared<OpaqueJSString>;
+
+    OpaqueJSString()
+        : m_characters(0)
+        , m_length(0)
+    {
+    }
+
+    OpaqueJSString(const UChar* characters, unsigned length)
+        : m_length(length)
+    {
+        m_characters = new UChar[length];
+        memcpy(m_characters, characters, length * sizeof(UChar));
+    }
+
+    ~OpaqueJSString()
+    {
+        delete[] m_characters;
+    }
+
+    UChar* m_characters;
+    unsigned m_length;
+};
+
+#endif