dns_erlang

%% Generated by the Erlang ASN.1 BER compiler. Version: 5.0.7
%% Purpose: Encoding and decoding of the types in DNS-ASN1.

-module('DNS-ASN1').
-compile(nowarn_unused_vars).
-dialyzer(no_improper_lists).
-include("DNS-ASN1.hrl").
-asn1_info([{vsn,'5.0.7'},
            {module,'DNS-ASN1'},
            {options,[{i,"/Users/anthonyeden/Development/dnsimple/dns_erlang/asngen"},
 ber,
 {outdir,"/Users/anthonyeden/Development/dnsimple/dns_erlang/asngen"},
 {i,"."},
 {i,"/Users/anthonyeden/Development/dnsimple/dns_erlang/asn1"}]}]).

-export([encoding_rule/0,maps/0,bit_string_format/0,
         legacy_erlang_types/0]).
-export(['dialyzer-suppressions'/1]).
-export([
'enc_DSS-Sig'/2
]).

-export([
'dec_DSS-Sig'/2
]).

-export([info/0]).

-export([encode/2,decode/2]).

encoding_rule() -> ber.

maps() -> false.

bit_string_format() -> bitstring.

legacy_erlang_types() -> false.

encode(Type, Data) ->
try iolist_to_binary(element(1, encode_disp(Type, Data))) of
  Bytes ->
    {ok,Bytes}
  catch
    Class:Exception:Stk when Class =:= error; Class =:= exit ->
      case Exception of
        {error,{asn1,Reason}} ->
          {error,{asn1,{Reason,Stk}}};
        Reason ->
         {error,{asn1,{Reason,Stk}}}
      end
end.

decode(Type, Data) ->
try
   Result = decode_disp(Type, element(1, ber_decode_nif(Data))),
   {ok,Result}
  catch
    Class:Exception:Stk when Class =:= error; Class =:= exit ->
      case Exception of
        {error,{asn1,Reason}} ->
          {error,{asn1,{Reason,Stk}}};
        Reason ->
         {error,{asn1,{Reason,Stk}}}
      end
end.

encode_disp('DSS-Sig', Data) -> 'enc_DSS-Sig'(Data);
encode_disp(Type, _Data) -> exit({error,{asn1,{undefined_type,Type}}}).

decode_disp('DSS-Sig', Data) -> 'dec_DSS-Sig'(Data);
decode_disp(Type, _Data) -> exit({error,{asn1,{undefined_type,Type}}}).

info() ->
   case ?MODULE:module_info(attributes) of
     Attributes when is_list(Attributes) ->
       case lists:keyfind(asn1_info, 1, Attributes) of
         {_,Info} when is_list(Info) ->
           Info;
         _ ->
           []
       end;
     _ ->
       []
   end.


%%================================
%%  DSS-Sig
%%================================
'enc_DSS-Sig'(Val) ->
    'enc_DSS-Sig'(Val, [<<48>>]).

'enc_DSS-Sig'(Val, TagIn) ->
{_,Cindex1,Cindex2} = Val,

%%-------------------------------------------------
%% attribute r(1) with type INTEGER
%%-------------------------------------------------
   {EncBytes1,EncLen1} = encode_integer(Cindex1, [<<2>>]),

%%-------------------------------------------------
%% attribute s(2) with type INTEGER
%%-------------------------------------------------
   {EncBytes2,EncLen2} = encode_integer(Cindex2, [<<2>>]),

   BytesSoFar = [EncBytes1, EncBytes2],
LenSoFar = EncLen1 + EncLen2,
encode_tags(TagIn, BytesSoFar, LenSoFar).


'dec_DSS-Sig'(Tlv) ->
   'dec_DSS-Sig'(Tlv, [16]).

'dec_DSS-Sig'(Tlv, TagIn) ->
   %%-------------------------------------------------
   %% decode tag and length 
   %%-------------------------------------------------
Tlv1 = match_tags(Tlv, TagIn),

%%-------------------------------------------------
%% attribute r(1) with type INTEGER
%%-------------------------------------------------
[V1|Tlv2] = Tlv1, 
Term1 = decode_integer(V1, [2]),

%%-------------------------------------------------
%% attribute s(2) with type INTEGER
%%-------------------------------------------------
[V2|Tlv3] = Tlv2, 
Term2 = decode_integer(V2, [2]),

case Tlv3 of
[] -> true;_ -> exit({error,{asn1, {unexpected,Tlv3}}}) % extra fields not allowed
end,
Res1 = {'DSS-Sig',Term1,Term2},
Res1.

%%%
%%% Run-time functions.
%%%

'dialyzer-suppressions'(Arg) ->
    ok.

ber_decode_nif(B) ->
    asn1rt_nif:decode_ber_tlv(B).

decode_integer(Tlv, TagIn) ->
    Bin = match_tags(Tlv, TagIn),
    Len = byte_size(Bin),
    <<Int:Len/signed-unit:8>> = Bin,
    Int.

encode_integer(Val) ->
    Bytes =
        if
            Val >= 0 ->
                encode_integer_pos(Val, []);
            true ->
                encode_integer_neg(Val, [])
        end,
    {Bytes,length(Bytes)}.

encode_integer(Val, Tag) when is_integer(Val) ->
    encode_tags(Tag, encode_integer(Val));
encode_integer(Val, _Tag) ->
    exit({error,{asn1,{encode_integer,Val}}}).

encode_integer_neg(- 1, [B1|_T] = L) when B1 > 127 ->
    L;
encode_integer_neg(N, Acc) ->
    encode_integer_neg(N bsr 8, [N band 255|Acc]).

encode_integer_pos(0, [B|_Acc] = L) when B < 128 ->
    L;
encode_integer_pos(N, Acc) ->
    encode_integer_pos(N bsr 8, [N band 255|Acc]).

encode_length(L) when L =< 127 ->
    {[L],1};
encode_length(L) ->
    Oct = minimum_octets(L),
    Len = length(Oct),
    if
        Len =< 126 ->
            {[128 bor Len|Oct],Len + 1};
        true ->
            exit({error,{asn1,too_long_length_oct,Len}})
    end.

encode_tags(TagIn, {BytesSoFar,LenSoFar}) ->
    encode_tags(TagIn, BytesSoFar, LenSoFar).

encode_tags([Tag|Trest], BytesSoFar, LenSoFar) ->
    {Bytes2,L2} = encode_length(LenSoFar),
    encode_tags(Trest,
                [Tag,Bytes2|BytesSoFar],
                LenSoFar + byte_size(Tag) + L2);
encode_tags([], BytesSoFar, LenSoFar) ->
    {BytesSoFar,LenSoFar}.

match_tags({T,V}, [T]) ->
    V;
match_tags({T,V}, [T|Tt]) ->
    match_tags(V, Tt);
match_tags([{T,V}], [T|Tt]) ->
    match_tags(V, Tt);
match_tags([{T,_V}|_] = Vlist, [T]) ->
    Vlist;
match_tags(Tlv, []) ->
    Tlv;
match_tags({Tag,_V} = Tlv, [T|_Tt]) ->
    exit({error,{asn1,{wrong_tag,{{expected,T},{got,Tag,Tlv}}}}}).

minimum_octets(0, Acc) ->
    Acc;
minimum_octets(Val, Acc) ->
    minimum_octets(Val bsr 8, [Val band 255|Acc]).

minimum_octets(Val) ->
    minimum_octets(Val, []).