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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2012-2017. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(asn1rtt_ext).
-export([transform_to_EXTERNAL1990/1,transform_to_EXTERNAL1990_maps/1,
transform_to_EXTERNAL1994/1,transform_to_EXTERNAL1994_maps/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); is_binary(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_EXTERNAL1990_maps(#{identification:=Id,'data-value':=Value}=V) ->
M0 = case Id of
{syntax,DRef} ->
#{'direct-reference'=>DRef};
{'presentation-context-id',IndRef} ->
#{'indirect-reference'=>IndRef};
{'context-negotiation',
#{'presentation-context-id':=IndRef,
'transfer-syntax':=DRef}} ->
#{'direct-reference'=>DRef,
'indirect-reference'=>IndRef}
end,
M = case V of
#{'data-value-descriptor':=Dvd} ->
M0#{'data-value-descriptor'=>Dvd};
#{} ->
M0
end,
M#{encoding=>{'octet-aligned',Value}};
transform_to_EXTERNAL1990_maps(#{encoding:=_}=V) ->
%% Already in the EXTERNAL 1990 format.
V.
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.
transform_to_EXTERNAL1994_maps(V0) ->
Identification =
case V0 of
#{'direct-reference':=DRef,
'indirect-reference':=asn1_NOVALUE} ->
{syntax,DRef};
#{'direct-reference':=asn1_NOVALUE,
'indirect-reference':=IndRef} ->
{'presentation-context-id',IndRef};
#{'direct-reference':=DRef,
'indirect-reference':=IndRef} ->
{'context-negotiation',
#{'transfer-syntax'=>DRef,
'presentation-context-id'=>IndRef}}
end,
case V0 of
#{encoding:={'octet-aligned',Val}}
when is_list(Val); is_binary(Val) ->
%% Transform to the EXTERNAL 1994 definition.
V = #{identification=>Identification,
'data-value'=>Val},
case V0 of
#{'data-value-descriptor':=asn1_NOVALUE} ->
V;
#{'data-value-descriptor':=Dvd} ->
V#{'data-value-descriptor'=>Dvd}
end;
_ ->
%% Keep the EXTERNAL 1990 definition to avoid losing
%% information.
V = [{K,V} || {K,V} <- maps:to_list(V0),
V =/= asn1_NOVALUE],
maps:from_list(V)
end.
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