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diff --git a/Source/JavaScriptCore/wtf/url/src/URLComponent.h b/Source/JavaScriptCore/wtf/url/src/URLComponent.h
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+// Copyright 2010, Google 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:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * 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.
+//     * Neither the name of Google Inc. 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+// OWNER 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 URLComponent_h
+#define URLComponent_h
+
+namespace WTF {
+
+// Represents a substring for URL parsing.
+class URLComponent {
+public:
+    URLComponent() : m_begin(0), m_length(-1) { }
+    URLComponent(int begin, int length) : m_begin(begin), m_length(length) { }
+
+    // Helper that returns a component created with the given begin and ending
+    // points. The ending point is non-inclusive.
+    static inline URLComponent fromRange(int begin, int end)
+    {
+        return URLComponent(begin, end - begin);
+    }
+
+    // Returns true if this component is valid, meaning the length is given. Even
+    // valid components may be empty to record the fact that they exist.
+    bool isValid() const { return m_length != -1; }
+
+    bool isNonEmpty() const { return m_length > 0; }
+    bool isEmptyOrInvalid() const { return m_length <= 0; }
+
+    void reset()
+    {
+        m_begin = 0;
+        m_length = -1;
+    }
+
+    bool operator==(const URLComponent& other) const { return m_begin == other.m_begin && m_length == other.m_length; }
+
+    int begin() const { return m_begin; }
+    void setBegin(int begin) { m_begin = begin; }
+
+    int length() const { return m_length; }
+    void setLength(int length) { m_length = length; }
+
+    int end() const { return m_begin + m_length; }
+
+private:
+    int m_begin; // Byte offset in the string of this component.
+    int m_length; // Will be -1 if the component is unspecified.
+};
+
+} // namespace WTF
+
+#endif // URLComponent_h