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+// Copyright (c) 2006, 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.
+
+// address_map.h: Address maps.
+//
+// An address map contains a set of objects keyed by address.  Objects are
+// retrieved from the map by returning the object with the highest key less
+// than or equal to the lookup key.
+//
+// Author: Mark Mentovai
+
+#ifndef PROCESSOR_ADDRESS_MAP_H__
+#define PROCESSOR_ADDRESS_MAP_H__
+
+#include <map>
+
+namespace google_breakpad {
+
+// Forward declarations (for later friend declarations).
+template<class, class> class AddressMapSerializer;
+
+template<typename AddressType, typename EntryType>
+class AddressMap {
+ public:
+  AddressMap() : map_() {}
+
+  // Inserts an entry into the map.  Returns false without storing the entry
+  // if an entry is already stored in the map at the same address as specified
+  // by the address argument.
+  bool Store(const AddressType &address, const EntryType &entry);
+
+  // Locates the entry stored at the highest address less than or equal to
+  // the address argument.  If there is no such range, returns false.  The
+  // entry is returned in entry, which is a required argument.  If
+  // entry_address is not NULL, it will be set to the address that the entry
+  // was stored at.
+  bool Retrieve(const AddressType &address,
+                EntryType *entry, AddressType *entry_address) const;
+
+  // Empties the address map, restoring it to the same state as when it was
+  // initially created.
+  void Clear();
+
+ private:
+  friend class AddressMapSerializer<AddressType, EntryType>;
+  friend class ModuleComparer;
+
+  // Convenience types.
+  typedef std::map<AddressType, EntryType> AddressToEntryMap;
+  typedef typename AddressToEntryMap::const_iterator MapConstIterator;
+  typedef typename AddressToEntryMap::value_type MapValue;
+
+  // Maps the address of each entry to an EntryType.
+  AddressToEntryMap map_;
+};
+
+}  // namespace google_breakpad
+
+#endif  // PROCESSOR_ADDRESS_MAP_H__