Implement support for importing favorites from Edge on Windows 10.

chrome/utility/importer/edge_database_reader_win.h

+// Copyright 2015 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_UTILITY_IMPORTER_EDGE_DATABASE_READER_WIN_H_
+#define CHROME_UTILITY_IMPORTER_EDGE_DATABASE_READER_WIN_H_
+
+#define JET_UNICODE
+#include <esent.h>
+#undef JET_UNICODE
+
+#include <map>
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+
+class EdgeErrorObject {
+ public:
+  EdgeErrorObject() : last_error_(JET_errSuccess) {}
+
+  // Get the last error converted to a descriptive string.
+  base::string16 GetErrorMessage() const;
+  // Get the last error value.
+  JET_ERR last_error() const { return last_error_; }
+
+ protected:
+  // This function returns true if the passed error parameter is equal
+  // to JET_errSuccess
+  bool SetLastError(JET_ERR error);
+
+ private:
+  JET_ERR last_error_;
+
+  DISALLOW_COPY_AND_ASSIGN(EdgeErrorObject);
+};
+
+class EdgeDatabaseTableEnumerator : public EdgeErrorObject {
+ public:
+  EdgeDatabaseTableEnumerator(const base::string16& table_name,
+                              JET_SESID session_id,
+                              JET_TABLEID table_id);
+
+  ~EdgeDatabaseTableEnumerator();
+
+  const base::string16& table_name() { return table_name_; }
+
+  // Reset the enumerator to the start of the table. Returns true if successful.
+  bool Reset();
+  // Move to the next row in the table. Returns false on error or no more rows.
+  bool Next();
+
+  // Retrieve a column's data value. If a NULL is encountered in the column the
+  // default value for the template type is placed in |value|.
+  template <typename T>
+  bool RetrieveColumn(const base::string16& column_name, T* value);
+
+ private:
+  const JET_COLUMNBASE& GetColumnByName(const base::string16& column_name);
+
+  std::map<const base::string16, JET_COLUMNBASE> columns_by_name_;
+  JET_TABLEID table_id_;
+  base::string16 table_name_;
+  JET_SESID session_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(EdgeDatabaseTableEnumerator);
+};
+
+class EdgeDatabaseReader : public EdgeErrorObject {
+ public:
+  EdgeDatabaseReader()
+      : db_id_(JET_dbidNil),
+        instance_id_(JET_instanceNil),
+        session_id_(JET_sesidNil) {}
+
+  ~EdgeDatabaseReader();
+
+  // Open the database from a file path. Returns true on success.
+  bool OpenDatabase(const base::string16& database_file);
+
+  // Open a row enumerator for a specified table. Returns a nullptr on error.
+  scoped_ptr<EdgeDatabaseTableEnumerator> OpenTableEnumerator(
+      const base::string16& table_name);
+
+ private:
+  bool IsOpen() { return instance_id_ != JET_instanceNil; }
+
+  JET_DBID db_id_;
+  JET_INSTANCE instance_id_;
+  JET_SESID session_id_;
+
+  DISALLOW_COPY_AND_ASSIGN(EdgeDatabaseReader);
+};
+
+#endif  // CHROME_UTILITY_IMPORTER_EDGE_DATABASE_READER_WIN_H_