Check that all the hashes ids in the model are valid.

chrome/browser/safe_browsing/client_side_detection_service.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Helper class which handles communication with the SafeBrowsing backends for
 // client-side phishing detection.  This class is used to fetch the client-side
 // model and send it to all renderers.  This class is also used to send a ping
 // back to Google to verify if a particular site is really phishing or not.
 //
 // This class is not thread-safe and expects all calls to be made on the UI
@@ skipping 112 matching lines @@
   // Enum used to keep stats about why we fail to get the client model.
   enum ClientModelStatus {
     MODEL_SUCCESS,
     MODEL_NOT_CHANGED,
     MODEL_FETCH_FAILED,
     MODEL_EMPTY,
     MODEL_TOO_LARGE,
     MODEL_PARSE_ERROR,
     MODEL_MISSING_FIELDS,
     MODEL_INVALID_VERSION_NUMBER,
+    MODEL_BAD_HASH_IDS,
     MODEL_STATUS_MAX  // Always add new values before this one.
   };
 
   // Starts fetching the model from the network or the cache.  This method
   // is called periodically to check whether a new client model is available
   // for download.
   void StartFetchModel();
 
   // This method is called when we're done fetching the model either because
   // we hit an error somewhere or because we're actually done fetch and
   // validating the model.
   virtual void EndFetchModel(ClientModelStatus status);  // Virtual for testing.
 
  private:
   friend class ClientSideDetectionServiceTest;
   FRIEND_TEST_ALL_PREFIXES(ClientSideDetectionServiceTest, FetchModelTest);
   FRIEND_TEST_ALL_PREFIXES(ClientSideDetectionServiceTest, SetBadSubnets);
   FRIEND_TEST_ALL_PREFIXES(ClientSideDetectionServiceTest, IsBadIpAddress);
+  FRIEND_TEST_ALL_PREFIXES(ClientSideDetectionServiceTest,
+                           ModelHasValidHashIds);
 
   // CacheState holds all information necessary to respond to a caller without
   // actually making a HTTP request.
   struct CacheState {
     bool is_phishing;
     base::Time timestamp;
 
     CacheState(bool phish, base::Time time);
   };
   typedef std::map<GURL, linked_ptr<CacheState> > PhishingCache;
@@ skipping 56 matching lines @@
 
   // Same as above but sends the model to all rendereres.
   void SendModelToRenderers();
 
   // Reads the bad subnets from the client model and inserts them into
   // |bad_subnets| for faster lookups.  This method is static to simplify
   // testing.
   static void SetBadSubnets(const ClientSideModel& model,
                             BadSubnetMap* bad_subnets);
 
+
+  // Returns true iff all the hash id's in the client-side model point to
+  // valid hashes in the model.
+  static bool ModelHasValidHashIds(const ClientSideModel& model);
+
   std::string model_str_;
   scoped_ptr<ClientSideModel> model_;
   scoped_ptr<base::TimeDelta> model_max_age_;
   scoped_ptr<URLFetcher> model_fetcher_;
 
   // Map of client report phishing request to the corresponding callback that
   // has to be invoked when the request is done.
   struct ClientReportInfo;
   std::map<const URLFetcher*, ClientReportInfo*> client_phishing_reports_;
 
@@ skipping 24 matching lines @@
   // this map to speed up lookups.
   BadSubnetMap bad_subnets_;
 
   NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(ClientSideDetectionService);
 };
 }  // namepsace safe_browsing
 
 #endif  // CHROME_BROWSER_SAFE_BROWSING_CLIENT_SIDE_DETECTION_SERVICE_H_