Handle overflow, underflow in XPath substring position, length.

third_party/WebKit/Source/core/xml/XPathValue.h

 /*
  * Copyright 2005 Frerich Raabe <raabe@kde.org>
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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 THE AUTHOR ``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 AUTHOR 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 XPathValue_h
 #define XPathValue_h
 
+#include "core/CoreExport.h"
 #include "core/xml/XPathNodeSet.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 namespace XPath {
 
 struct EvaluationContext;
 
 class ValueData : public GarbageCollectedFinalized<ValueData> {
@@ skipping 17 matching lines @@
       : m_nodeSet(NodeSet::create(nodeSet)) {}
   explicit ValueData(NodeSet* nodeSet) : m_nodeSet(nodeSet) {}
   explicit ValueData(const String& string)
       : m_string(string), m_nodeSet(NodeSet::create()) {}
 
   Member<NodeSet> m_nodeSet;
 };
 
 // Copying Value objects makes their data partially shared, so care has to be
 // taken when dealing with copies.
-class Value {
+class CORE_EXPORT Value {
   DISALLOW_NEW();
 
  public:
   enum Type { NodeSetValue, BooleanValue, NumberValue, StringValue };
 
   Value(unsigned value) : m_type(NumberValue), m_bool(false), m_number(value) {}
   Value(unsigned long value)
       : m_type(NumberValue), m_bool(false), m_number(value) {}
   Value(double value) : m_type(NumberValue), m_bool(false), m_number(value) {}
 
@@ skipping 58 matching lines @@
 
 template <>
 inline Value::Value(bool value)
     : m_type(BooleanValue), m_bool(value), m_number(0) {}
 
 }  // namespace XPath
 
 }  // namespace blink
 
 #endif  // XPathValue_h