anchor.diff:  	when
   		Result :: ok | {error, Reason},
   		Reason :: term().
  -%% @doc Open the authorization log for logging events.
  +%% @doc Open authorization log for logging events.
   auth_open() ->
   	{ok, Directory} = application:get_env(ocs, auth_log_dir),
   	case file:make_dir(Directory) of
  
positive.code: %% 	Filters out records before `Start' and after `End'.
  %% 	Returns filtered records.
  %% @private
  get_range(Log, Start, End, Cont) ->
  	get_range(Log, Start, End, [], disk_log:chunk(Log, Cont)).
  %% @hidden
  
negative.code: 		Reason :: term().
  %% @doc Binary tree search of multi file wrap disk_log.
  %% @private
  %% @hidden
  start_binary_tree(Log, Start, _End) ->
  	InfoList = disk_log:info(Log),
  	{size, {_MaxBytes, MaxFiles}} = lists:keyfind(size, 1, InfoList),
  