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-module(dlink_data_msgpack).
-compile(export_all).
-record(st, {opts = [{allow_atom, pack},
{enable_str, true},
jsx],
buf = <<>>}).
port_options() ->
[binary, {packet, 0}].
init(_CS) ->
#st{}.
decode(Msg0, #st{buf = Prev, opts = Opts} = St) ->
Msg = append(Prev, Msg0),
case msgpack:unpack_stream(Msg, Opts) of
{error, incomplete} ->
{more, St#st{buf = Msg}};
{error, E} ->
{error, E, St};
{Decoded, Rest} when is_binary(Rest) ->
{ok, Decoded, St#st{buf = Rest}}
end.
encode({struct, Elems}, #st{opts = Opts} = St) ->
{ok, msgpack:pack(to_jsx(Elems), Opts), St};
encode({array, Elems}, #st{opts = Opts} = St) ->
{ok, msgpack:pack(to_jsx(Elems), Opts), St};
encode([{_,_}|_] = Data, #st{opts = Opts} = St) ->
{ok, msgpack:pack(Data, Opts), St}.
append(<<>>, Msg) ->
Msg;
append(Prev, Msg) ->
<<Prev/binary, Msg/binary>>.
to_jsx({struct, Elems}) ->
{[to_jsx(E) || E <- Elems]};
to_jsx({array, Elems}) ->
[to_jsx(E) || E <- Elems];
to_jsx({K,V}) ->
{K, to_jsx(V)};
to_jsx(X) ->
X.
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