%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(asn1rtt_ext).
-export([transform_to_EXTERNAL1990/1,transform_to_EXTERNAL1994/1]).
transform_to_EXTERNAL1990({_,_,_,_}=Val) ->
transform_to_EXTERNAL1990(tuple_to_list(Val), []);
transform_to_EXTERNAL1990(Val) when is_tuple(Val) ->
%% Data already in ASN1 1990 format
Val.
transform_to_EXTERNAL1990(['EXTERNAL'|Rest], Acc) ->
transform_to_EXTERNAL1990(Rest, ['EXTERNAL'|Acc]);
transform_to_EXTERNAL1990([{syntax,Syntax}|Rest], Acc) ->
transform_to_EXTERNAL1990(Rest, [asn1_NOVALUE,Syntax|Acc]);
transform_to_EXTERNAL1990([{'presentation-context-id',PCid}|Rest], Acc) ->
transform_to_EXTERNAL1990(Rest, [PCid,asn1_NOVALUE|Acc]);
transform_to_EXTERNAL1990([{'context-negotiation',Context_negot}|Rest], Acc) ->
{_,Presentation_Cid,Transfer_syntax} = Context_negot,
transform_to_EXTERNAL1990(Rest, [Presentation_Cid,Transfer_syntax|Acc]);
transform_to_EXTERNAL1990([asn1_NOVALUE|Rest], Acc) ->
transform_to_EXTERNAL1990(Rest, [asn1_NOVALUE|Acc]);
transform_to_EXTERNAL1990([Data_val_desc,Data_value], Acc)
when is_list(Data_value)->
list_to_tuple(lists:reverse([{'octet-aligned',Data_value},
Data_val_desc|Acc]));
transform_to_EXTERNAL1990([Data_val_desc,Data_value], Acc)
when is_binary(Data_value) ->
list_to_tuple(lists:reverse([{'single-ASN1-type',Data_value},
Data_val_desc|Acc]));
transform_to_EXTERNAL1990([Data_value], Acc)
when is_list(Data_value); is_binary(Data_value) ->
list_to_tuple(lists:reverse([{'octet-aligned',Data_value}|Acc])).
transform_to_EXTERNAL1994({'EXTERNAL',DRef,IndRef,Data_v_desc,Encoding}=V) ->
Identification =
case {DRef,IndRef} of
{DRef,asn1_NOVALUE} ->
{syntax,DRef};
{asn1_NOVALUE,IndRef} ->
{'presentation-context-id',IndRef};
_ ->
{'context-negotiation',
{'EXTERNAL_identification_context-negotiation',IndRef,DRef}}
end,
case Encoding of
{'octet-aligned',Val} when is_list(Val); is_binary(Val) ->
%% Transform to the EXTERNAL 1994 definition.
{'EXTERNAL',Identification,Data_v_desc,Val};
_ ->
%% Keep the EXTERNAL 1990 definition to avoid losing
%% information.
V
end.
