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diff --git a/Source/JavaScriptCore/wtf/text/CString.h b/Source/JavaScriptCore/wtf/text/CString.h
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+++ b/Source/JavaScriptCore/wtf/text/CString.h
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+/*
+ * Copyright (C) 2003, 2006, 2008, 2009, 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 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 CString_h
+#define CString_h
+
+#include "PassRefPtr.h"
+#include "RefCounted.h"
+#include "Vector.h"
+
+namespace WTF {
+
+class CStringBuffer : public RefCounted<CStringBuffer> {
+public:
+    const char* data() { return m_vector.data(); }
+    size_t length() { return m_vector.size(); }
+
+private:
+    friend class CString;
+
+    static PassRefPtr<CStringBuffer> create(size_t length) { return adoptRef(new CStringBuffer(length)); }
+    CStringBuffer(size_t length) : m_vector(length) { }
+    char* mutableData() { return m_vector.data(); }
+
+    Vector<char> m_vector;
+};
+
+// A container for a null-terminated char array supporting copy-on-write
+// assignment.  The contained char array may be null.
+class CString {
+public:
+    CString() { }
+    CString(const char*);
+    CString(const char*, size_t length);
+    CString(CStringBuffer* buffer) : m_buffer(buffer) { }
+    static CString newUninitialized(size_t length, char*& characterBuffer);
+
+    const char* data() const
+    {
+        return m_buffer ? m_buffer->data() : 0;
+    }
+    char* mutableData();
+    size_t length() const
+    {
+        return m_buffer ? m_buffer->length() - 1 : 0;
+    }
+
+    bool isNull() const { return !m_buffer; }
+
+    CStringBuffer* buffer() const { return m_buffer.get(); }
+
+private:
+    void copyBufferIfNeeded();
+    void init(const char*, size_t length);
+    RefPtr<CStringBuffer> m_buffer;
+};
+
+bool operator==(const CString& a, const CString& b);
+inline bool operator!=(const CString& a, const CString& b) { return !(a == b); }
+
+} // namespace WTF
+
+using WTF::CString;
+
+#endif // CString_h