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%%%----------------------------------------------------------------------
%%% 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]).
%% Internal exports, call-back functions.
-export([init/1,
handle_call/3,
handle_cast/2,
handle_info/2,
code_change/3,
terminate/2]).
start() ->
gen_server:start({local, ?MODULE}, ?MODULE, [], []).
start_link() ->
gen_server:start_link({local, ?MODULE}, ?MODULE, [], []).
init([]) ->
ok = erl_ddll:load_driver(".", stringprep_drv),
Port = open_port({spawn, stringprep_drv}, []),
ets:new(stringprep_table, [set, public, named_table]),
ets:insert(stringprep_table, {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) ->
[{port, Port} | _] = ets:lookup(stringprep_table, port),
Res = port_control(Port, 1, String),
binary_to_list(Res).
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