%%%----------------------------------------------------------------------
%%% File : stringprep.erl
%%% Author : Alexey Shchepin <alexey@sevcom.net>
%%% Purpose : Interface to stringprep_drv
%%% Created : 16 Feb 2003 by Alexey Shchepin <alexey@sevcom.net>
%%% Id : $Id$
%%%----------------------------------------------------------------------
-module(stringprep).
-author('alexey@sevcom.net').
-vsn('$Revision$ ').
-behaviour(gen_server).
-export([start/0, start_link/0,
tolower/1,
nameprep/1,
nodeprep/1,
resourceprep/1]).
%% Internal exports, call-back functions.
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
code_change/3,
terminate/2]).
-define(STRINGPREP_PORT, stringprep_port).
-define(NAMEPREP_COMMAND, 1).
-define(NODEPREP_COMMAND, 2).
-define(RESOURCEPREP_COMMAND, 3).
start() ->
gen_server:start({local, ?MODULE}, ?MODULE, [], []).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
case erl_ddll:load_driver(ejabberd:get_so_path(), stringprep_drv) of
ok -> ok;
{error, already_loaded} -> ok
end,
Port = open_port({spawn, stringprep_drv}, []),
register(?STRINGPREP_PORT, Port),
{ok, Port}.
%%% --------------------------------------------------------
%%% The call-back functions.
%%% --------------------------------------------------------
handle_call(_, _, State) ->
{noreply, State}.
handle_cast(_, State) ->
{noreply, State}.
handle_info({'EXIT', Pid, Reason}, Port) ->
{noreply, Port};
handle_info({'EXIT', Port, Reason}, Port) ->
{stop, {port_died, Reason}, Port};
handle_info(_, State) ->
{noreply, State}.
code_change(OldVsn, State, Extra) ->
{ok, State}.
terminate(_Reason, Port) ->
Port ! {self, close},
ok.
tolower(String) ->
control(0, String).
nameprep(String) ->
control(?NAMEPREP_COMMAND, String).
nodeprep(String) ->
control(?NODEPREP_COMMAND, String).
resourceprep(String) ->
control(?RESOURCEPREP_COMMAND, String).
control(Command, String) ->
case port_control(?STRINGPREP_PORT, Command, String) of
[0 | _] -> error;
[1 | Res] -> Res
end.
