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%%%----------------------------------------------------------------------
%%% File : stringprep.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Interface to stringprep_drv
%%% Created : 16 Feb 2003 by Alexey Shchepin <alexey@proces-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2013 ProcessOne
%%%
%%% This program is free software; you can redistribute it and/or
%%% modify it under the terms of the GNU General Public License as
%%% published by the Free Software Foundation; either version 2 of the
%%% License, or (at your option) any later version.
%%%
%%% This program is distributed in the hope that it will be useful,
%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
%%% General Public License for more details.
%%%
%%% You should have received a copy of the GNU General Public License
%%% along with this program; if not, write to the Free Software
%%% Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
%%% 02111-1307 USA
%%%
%%%----------------------------------------------------------------------
-module(stringprep).
-author('alexey@process-one.net').
-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', Port, Reason}, Port) ->
{stop, {port_died, Reason}, Port};
handle_info({'EXIT', _Pid, _Reason}, Port) ->
{noreply, Port};
handle_info(_, State) -> {noreply, State}.
code_change(_OldVsn, State, _Extra) -> {ok, State}.
terminate(_Reason, Port) -> Port ! {self, close}, ok.
-spec tolower(binary()) -> binary() | error.
tolower(String) -> control(0, String).
-spec nameprep(binary()) -> binary() | error.
nameprep(String) -> control(?NAMEPREP_COMMAND, String).
-spec nodeprep(binary()) -> binary() | error.
nodeprep(String) -> control(?NODEPREP_COMMAND, String).
-spec resourceprep(binary()) -> binary() | error.
resourceprep(String) ->
control(?RESOURCEPREP_COMMAND, String).
control(Command, String) ->
case port_control(?STRINGPREP_PORT, Command, String) of
<<0, _/binary>> -> error;
<<1, Res/binary>> -> Res
end.
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