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diff --git a/Source/JavaScriptCore/wtf/text/StringBuffer.h b/Source/JavaScriptCore/wtf/text/StringBuffer.h
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+++ b/Source/JavaScriptCore/wtf/text/StringBuffer.h
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+/*
+ * Copyright (C) 2008, 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. 
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE 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 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 StringBuffer_h
+#define StringBuffer_h
+
+#include <wtf/Assertions.h>
+#include <wtf/Noncopyable.h>
+#include <wtf/unicode/Unicode.h>
+#include <limits>
+
+namespace WTF {
+
+class StringBuffer : public Noncopyable {
+public:
+    explicit StringBuffer(unsigned length)
+        : m_length(length)
+    {
+        if (m_length > std::numeric_limits<unsigned>::max() / sizeof(UChar))
+            CRASH();
+        m_data = static_cast<UChar*>(fastMalloc(m_length * sizeof(UChar)));
+    }
+
+    ~StringBuffer()
+    {
+        fastFree(m_data);
+    }
+
+    void shrink(unsigned newLength)
+    {
+        ASSERT(newLength <= m_length);
+        m_length = newLength;
+    }
+
+    void resize(unsigned newLength)
+    {
+        if (newLength > m_length) {
+            if (newLength > std::numeric_limits<unsigned>::max() / sizeof(UChar))
+                CRASH();
+            m_data = static_cast<UChar*>(fastRealloc(m_data, newLength * sizeof(UChar)));
+        }
+        m_length = newLength;
+    }
+
+    unsigned length() const { return m_length; }
+    UChar* characters() { return m_data; }
+
+    UChar& operator[](unsigned i) { ASSERT(i < m_length); return m_data[i]; }
+
+    UChar* release() { UChar* data = m_data; m_data = 0; return data; }
+
+private:
+    unsigned m_length;
+    UChar* m_data;
+};
+
+} // namespace WTF
+
+using WTF::StringBuffer;
+
+#endif // StringBuffer_h