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%%%----------------------------------------------------------------------
%%% File : iconv.erl
%%% Author : Alexey Shchepin <alexey@process-one.net>
%%% Purpose : Interface to libiconv
%%% Created : 16 Feb 2003 by Alexey Shchepin <alexey@process-one.net>
%%%
%%%
%%% ejabberd, Copyright (C) 2002-2011 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(iconv).
-author('alexey@process-one.net').
-behaviour(gen_server).
-export([start/0, start_link/0, convert/3]).
%% 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([]) ->
case erl_ddll:load_driver(get_so_path(), iconv_drv) of
ok -> ok;
{error, already_loaded} -> ok
end,
Port = open_port({spawn, "iconv_drv"}, []),
ets:new(iconv_table, [set, public, named_table]),
ets:insert(iconv_table, {port, Port}),
{ok, Port}.
get_so_path() ->
case code:priv_dir(iconv) of
{error, _} -> "./priv";
Path -> Path
end.
%%% --------------------------------------------------------
%%% 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.
convert(From, To, String) ->
[{port, Port} | _] = ets:lookup(iconv_table, port),
Bin = term_to_binary({From, To, String}),
BRes = port_control(Port, 1, Bin),
binary_to_list(BRes).