Convert internal time format to Windows 1601 epoch on Linux & Mac....

chrome/browser/history/history_database.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef CHROME_BROWSER_HISTORY_HISTORY_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_DATABASE_H_
 
+#include "build/build_config.h"
 #include "chrome/browser/history/download_database.h"
 #include "chrome/browser/history/history_types.h"
 #include "chrome/browser/history/starred_url_database.h"
 #include "chrome/browser/history/url_database.h"
 #include "chrome/browser/history/visit_database.h"
 #include "chrome/browser/history/visitsegment_database.h"
 #include "chrome/browser/meta_table_helper.h"
 
 struct sqlite3;
 
@@ skipping 85 matching lines @@
   //
   // This will also recreate the supplementary URL indices, since these
   // indices won't be created automatically when using the temporary URL
   // table (what the caller does right before calling this).
   bool RecreateAllTablesButURL();
 
   // Vacuums the database. This will cause sqlite to defragment and collect
   // unused space in the file. It can be VERY SLOW.
   void Vacuum();
 
+  // Returns true if the history backend should erase the full text search
+  // and archived history files as part of version 16 -> 17 migration. The
+  // time format changed in this revision, and these files would be much slower
+  // to migrate. Since the data is less important, they should be deleted.
+  //
+  // This flag will be valid after Init() is called. It will always be false
+  // when running on Windows.
+  bool needs_version_17_migration() const {
+    return needs_version_17_migration_;
+  }
+
   // Visit table functions ----------------------------------------------------
 
   // Update the segment id of a visit. Return true on success.
   bool SetSegmentID(VisitID visit_id, SegmentID segment_id);
 
   // Query the segment ID for the provided visit. Return 0 on failure or if the
   // visit id wasn't found.
   SegmentID GetSegmentID(VisitID visit_id);
 
   // Retrieves/Updates early expiration threshold, which specifies the earliest
@@ skipping 14 matching lines @@
 
   // Makes sure the version is up-to-date, updating if necessary. If the
   // database is too old to migrate, the user will be notified. In this case, or
   // for other errors, false will be returned. True means it is up-to-date and
   // ready for use.
   //
   // This assumes it is called from the init function inside a transaction. It
   // may commit the transaction and start a new one if migration requires it.
   InitStatus EnsureCurrentVersion(const FilePath& tmp_bookmarks_path);
 
+#if !defined(OS_WIN)
+  // Converts the time epoch in the database from being 1970-based to being
+  // 1601-based which corresponds to the change in Time.internal_value_.
+  void MigrateTimeEpoch();
+#endif
+
   // ---------------------------------------------------------------------------
 
   // How many nested transactions are pending? When this gets to 0, we commit.
   int transaction_nesting_;
 
   // The database. The closer automatically closes the deletes the db and the
   // statement cache. These must be done in a specific order, so we don't want
   // to rely on C++'s implicit destructors for the individual objects.
   //
   // The close scoper will free the database and delete the statement cache in
   // the correct order automatically when we are destroyed.
   DBCloseScoper db_closer_;
   sqlite3* db_;
   SqliteStatementCache* statement_cache_;
 
   MetaTableHelper meta_table_;
   base::Time cached_early_expiration_threshold_;
 
+  // See the getter above.
+  bool needs_version_17_migration_;
+
   DISALLOW_COPY_AND_ASSIGN(HistoryDatabase);
 };
 
 }  // history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_DATABASE_H_