SafeBrowising: Read and write V4Store from/to disk

components/safe_browsing_db/v4_database.cc

 // Copyright 2016 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.
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/debug/leak_annotations.h"
+#include "base/files/file_util.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "components/safe_browsing_db/v4_database.h"
 #include "content/public/browser/browser_thread.h"
 
 using content::BrowserThread;
 
 namespace safe_browsing {
 
 // static
@@ skipping 23 matching lines @@
     const StoreFileNameMap& store_file_name_map,
     const scoped_refptr<base::SingleThreadTaskRunner>& callback_task_runner,
     NewDatabaseReadyCallback new_db_callback) {
   DCHECK(db_task_runner->RunsTasksOnCurrentThread());
 
   if (!factory_) {
     factory_ = new V4StoreFactory();
     ANNOTATE_LEAKING_OBJECT_PTR(factory_);
   }
 
+  if (!base::CreateDirectory(base_path)) {
+    NOTREACHED();
+  }
+
   std::unique_ptr<StoreMap> store_map = base::MakeUnique<StoreMap>();
   for (const auto& store_info : store_file_name_map) {
     const UpdateListIdentifier& update_list_identifier = store_info.first;
     const base::FilePath store_path = base_path.AppendASCII(store_info.second);
     (*store_map)[update_list_identifier].reset(
         factory_->CreateV4Store(db_task_runner, store_path));
   }
   std::unique_ptr<V4Database> v4_database(
       new V4Database(db_task_runner, std::move(store_map)));
 
@@ skipping 90 matching lines @@
 std::unique_ptr<StoreStateMap> V4Database::GetStoreStateMap() {
   std::unique_ptr<StoreStateMap> store_state_map =
       base::MakeUnique<StoreStateMap>();
   for (const auto& store_map_iter : *store_map_) {
     (*store_state_map)[store_map_iter.first] = store_map_iter.second->state();
   }
   return store_state_map;
 }
 
 }  // namespace safe_browsing