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Diffstat (limited to 'lib/dialyzer/test/r9c_SUITE_data/src/asn1/asn1rt_per_v1.erl')
| -rw-r--r-- | lib/dialyzer/test/r9c_SUITE_data/src/asn1/asn1rt_per_v1.erl | 1827 |
1 files changed, 1827 insertions, 0 deletions
diff --git a/lib/dialyzer/test/r9c_SUITE_data/src/asn1/asn1rt_per_v1.erl b/lib/dialyzer/test/r9c_SUITE_data/src/asn1/asn1rt_per_v1.erl new file mode 100644 index 0000000000..90ffb0cb1c --- /dev/null +++ b/lib/dialyzer/test/r9c_SUITE_data/src/asn1/asn1rt_per_v1.erl @@ -0,0 +1,1827 @@ +%% ``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 via the world wide web 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. +%% +%% The Initial Developer of the Original Code is Ericsson Utvecklings AB. +%% Portions created by Ericsson are Copyright 1999, Ericsson Utvecklings +%% AB. All Rights Reserved.'' +%% +%% $Id: asn1rt_per_v1.erl,v 1.1 2008/12/17 09:53:31 mikpe Exp $ +%% +-module(asn1rt_per_v1). + +%% encoding / decoding of PER aligned + +-include("asn1_records.hrl"). + +-export([dec_fixup/3, cindex/3, list_to_record/2]). +-export([setchoiceext/1, setext/1, fixoptionals/2, fixextensions/2, + setoptionals/1, fixoptionals2/3, getext/1, getextension/2, + skipextensions/3, getbit/1, getchoice/3 ]). +-export([getoptionals/2, getoptionals/3, set_choice/3, + getoptionals2/2, + encode_integer/2, encode_integer/3 ]). +-export([decode_integer/2, decode_integer/3, encode_small_number/1, + encode_boolean/1, decode_boolean/1, encode_length/2, + decode_length/1, decode_length/2, + encode_small_length/1, decode_small_length/1, + decode_compact_bit_string/3]). +-export([encode_enumerated/3, decode_enumerated/3, + encode_bit_string/3, decode_bit_string/3 ]). +-export([encode_octet_string/2, decode_octet_string/2, + encode_null/1, decode_null/1, + encode_object_identifier/1, decode_object_identifier/1, + complete/1]). + +-export([encode_open_type/2, decode_open_type/2]). + +-export([encode_UniversalString/2, decode_UniversalString/2, + encode_PrintableString/2, decode_PrintableString/2, + encode_GeneralString/2, decode_GeneralString/2, + encode_GraphicString/2, decode_GraphicString/2, + encode_TeletexString/2, decode_TeletexString/2, + encode_VideotexString/2, decode_VideotexString/2, + encode_VisibleString/2, decode_VisibleString/2, + encode_BMPString/2, decode_BMPString/2, + encode_IA5String/2, decode_IA5String/2, + encode_NumericString/2, decode_NumericString/2, + encode_ObjectDescriptor/2, decode_ObjectDescriptor/1 + ]). + + +dec_fixup(Terms,Cnames,RemBytes) -> + dec_fixup(Terms,Cnames,RemBytes,[]). + +dec_fixup([novalue|T],[_Hc|Tc],RemBytes,Acc) -> + dec_fixup(T,Tc,RemBytes,Acc); +dec_fixup([{_Name,novalue}|T],[_Hc|Tc],RemBytes,Acc) -> + dec_fixup(T,Tc,RemBytes,Acc); +dec_fixup([H|T],[Hc|Tc],RemBytes,Acc) -> + dec_fixup(T,Tc,RemBytes,[{Hc,H}|Acc]); +dec_fixup([],_Cnames,RemBytes,Acc) -> + {lists:reverse(Acc),RemBytes}. + +cindex(Ix,Val,Cname) -> + case element(Ix,Val) of + {Cname,Val2} -> Val2; + X -> X + end. + +% converts a list to a record if necessary +list_to_record(Name,List) when list(List) -> + list_to_tuple([Name|List]); +list_to_record(_Name,Tuple) when tuple(Tuple) -> + Tuple. + +%%-------------------------------------------------------- +%% setchoiceext(InRootSet) -> [{bit,X}] +%% X is set to 1 when InRootSet==false +%% X is set to 0 when InRootSet==true +%% +setchoiceext(true) -> + [{debug,choiceext},{bit,0}]; +setchoiceext(false) -> + [{debug,choiceext},{bit,1}]. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% setext(true|false) -> CompleteList +%% + +setext(true) -> + [{debug,ext},{bit,1}]; +setext(false) -> + [{debug,ext},{bit,0}]. + +%% + +fixoptionals2(OptList,OptLength,Val) when tuple(Val) -> + Bits = fixoptionals2(OptList,Val,0), + {Val,{bits,OptLength,Bits}}; + +fixoptionals2([],_Val,Acc) -> + %% Optbits + Acc; +fixoptionals2([Pos|Ot],Val,Acc) -> + case element(Pos,Val) of + asn1_NOVALUE -> fixoptionals2(Ot,Val,Acc bsl 1); + asn1_DEFAULT -> fixoptionals2(Ot,Val,Acc bsl 1); + _ -> fixoptionals2(Ot,Val,(Acc bsl 1) + 1) + end. + + +%% +%% fixoptionals remains only for backward compatibility purpose +fixoptionals(OptList,Val) when tuple(Val) -> + fixoptionals(OptList,Val,[]); + +fixoptionals(OptList,Val) when list(Val) -> + fixoptionals(OptList,Val,1,[],[]). + +fixoptionals([],Val,Acc) -> + % return {Val,Opt} + {Val,lists:reverse(Acc)}; +fixoptionals([{_,Pos}|Ot],Val,Acc) -> + case element(Pos+1,Val) of + asn1_NOVALUE -> fixoptionals(Ot,Val,[0|Acc]); + asn1_DEFAULT -> fixoptionals(Ot,Val,[0|Acc]); + _ -> fixoptionals(Ot,Val,[1|Acc]) + end. + + +%setoptionals(OptList,Val) -> +% Vlist = tuple_to_list(Val), +% setoptionals(OptList,Vlist,1,[]). + +fixoptionals([{Name,Pos}|Ot],[{Name,Val}|Vt],_Opt,Acc1,Acc2) -> + fixoptionals(Ot,Vt,Pos+1,[1|Acc1],[{Name,Val}|Acc2]); +fixoptionals([{_Name,Pos}|Ot],V,Pos,Acc1,Acc2) -> + fixoptionals(Ot,V,Pos+1,[0|Acc1],[asn1_NOVALUE|Acc2]); +fixoptionals(O,[Vh|Vt],Pos,Acc1,Acc2) -> + fixoptionals(O,Vt,Pos+1,Acc1,[Vh|Acc2]); +fixoptionals([],[Vh|Vt],Pos,Acc1,Acc2) -> + fixoptionals([],Vt,Pos+1,Acc1,[Vh|Acc2]); +fixoptionals([],[],_,Acc1,Acc2) -> + % return {Val,Opt} + {list_to_tuple([asn1_RECORDNAME|lists:reverse(Acc2)]),lists:reverse(Acc1)}. + +setoptionals([H|T]) -> + [{bit,H}|setoptionals(T)]; +setoptionals([]) -> + [{debug,optionals}]. + +getext(Bytes) when tuple(Bytes) -> + getbit(Bytes); +getext(Bytes) when list(Bytes) -> + getbit({0,Bytes}). + +getextension(0, Bytes) -> + {{},Bytes}; +getextension(1, Bytes) -> + {Len,Bytes2} = decode_small_length(Bytes), + {Blist, Bytes3} = getbits_as_list(Len,Bytes2), + {list_to_tuple(Blist),Bytes3}. + +fixextensions({ext,ExtPos,ExtNum},Val) -> + case fixextensions(ExtPos,ExtNum+ExtPos,Val,0) of + 0 -> []; + ExtBits -> + [encode_small_length(ExtNum),{bits,ExtNum,ExtBits}] + end. + +fixextensions(Pos,MaxPos,_,Acc) when Pos >= MaxPos -> + Acc; +fixextensions(Pos,ExtPos,Val,Acc) -> + Bit = case catch(element(Pos+1,Val)) of + asn1_NOVALUE -> + 0; + asn1_NOEXTVALUE -> + 0; + {'EXIT',_} -> + 0; + _ -> + 1 + end, + fixextensions(Pos+1,ExtPos,Val,(Acc bsl 1)+Bit). + +skipextensions(Bytes,Nr,ExtensionBitPattern) -> + case (catch element(Nr,ExtensionBitPattern)) of + 1 -> + {_,Bytes2} = decode_open_type(Bytes,[]), + skipextensions(Bytes2, Nr+1, ExtensionBitPattern); + 0 -> + skipextensions(Bytes, Nr+1, ExtensionBitPattern); + {'EXIT',_} -> % badarg, no more extensions + Bytes + end. + + +getchoice(Bytes,1,0) -> % only 1 alternative is not encoded + {0,Bytes}; +getchoice(Bytes,_NumChoices,1) -> + decode_small_number(Bytes); +getchoice(Bytes,NumChoices,0) -> + decode_integer(Bytes,[{'ValueRange',{0,NumChoices-1}}]). + +getoptionals2(Bytes,NumOpt) -> + getbits(Bytes,NumOpt). + +%% getoptionals is kept only for bakwards compatibility +getoptionals(Bytes,NumOpt) -> + {Blist,Bytes1} = getbits_as_list(NumOpt,Bytes), + {list_to_tuple(Blist),Bytes1}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% getoptionals/3 is only here for compatibility from 1.3.2 +%% the codegenerator uses getoptionals/2 + +getoptionals(Bytes,L,NumComp) when list(L) -> + {Blist,Bytes1} = getbits_as_list(length(L),Bytes), + {list_to_tuple(comptuple(Blist,L,NumComp,1)),Bytes1}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% comptuple is only here for compatibility not used from 1.3.2 +comptuple([Bh|Bt],[{_Name,Nr}|T],NumComp,Nr) -> + [Bh|comptuple(Bt,T,NumComp-1,Nr+1)]; +comptuple(Bl,[{Name,Tnr}|Tl],NumComp,Nr) -> + [0|comptuple(Bl,[{Name,Tnr}|Tl],NumComp-1,Nr+1)]; +comptuple(_B,_L,0,_Nr) -> + []; +comptuple(B,O,N,Nr) -> + [0|comptuple(B,O,N-1,Nr+1)]. + +%% getbits_as_binary(Num,Bytes) -> {{Unused,BinBits},RestBytes}, +%% Num = integer(), +%% Bytes = list() | tuple(), +%% Unused = integer(), +%% BinBits = binary(), +%% RestBytes = tuple() +getbits_as_binary(Num,Bytes) when list(Bytes) -> + getbits_as_binary(Num,{0,Bytes}); +getbits_as_binary(_Num,{Used,[]}) -> + {{0,<<>>},{Used,[]}}; +getbits_as_binary(Num,{Used,Bits=[H|T]}) -> + B1 = case (Num+Used) =< 8 of + true -> Num; + _ -> 8-Used + end, + B2 = Num - B1, + Pad = (8 - ((B1+B2) rem 8)) rem 8,% Pad /= 8 + RestBits = lists:nthtail((B1+B2) div 8,Bits), + Int = integer_from_list(B2,T,0), + NewUsed = (Used + Num) rem 8, + {{Pad,<<(H bsr (8-(Used+B1))):B1,Int:B2,0:Pad>>},{NewUsed,RestBits}}. + +integer_from_list(_Int,[],BigInt) -> + BigInt; +integer_from_list(Int,[H|_T],BigInt) when Int < 8 -> + (BigInt bsl Int) bor (H bsr (8-Int)); +integer_from_list(Int,[H|T],BigInt) -> + integer_from_list(Int-8,T,(BigInt bsl 8) bor H). + +getbits_as_list(Num,Bytes) -> + getbits_as_list(Num,Bytes,[]). + +getbits_as_list(0,Bytes,Acc) -> + {lists:reverse(Acc),Bytes}; +getbits_as_list(Num,Bytes,Acc) -> + {Bit,NewBytes} = getbit(Bytes), + getbits_as_list(Num-1,NewBytes,[Bit|Acc]). + +getbit(Bytes) -> +% io:format("getbit:~p~n",[Bytes]), + getbit1(Bytes). + +getbit1({7,[H|T]}) -> + {H band 1,{0,T}}; +getbit1({Pos,[H|T]}) -> + {(H bsr (7-Pos)) band 1,{(Pos+1) rem 8,[H|T]}}; +getbit1(Bytes) when list(Bytes) -> + getbit1({0,Bytes}). + +%% This could be optimized +getbits(Buffer,Num) -> +% io:format("getbits:Buffer = ~p~nNum=~p~n",[Buffer,Num]), + getbits(Buffer,Num,0). + +getbits(Buffer,0,Acc) -> + {Acc,Buffer}; +getbits(Buffer,Num,Acc) -> + {B,NewBuffer} = getbit(Buffer), + getbits(NewBuffer,Num-1,B + (Acc bsl 1)). + + +getoctet(Bytes) when list(Bytes) -> + getoctet({0,Bytes}); +getoctet(Bytes) -> +% io:format("getoctet:Buffer = ~p~n",[Bytes]), + getoctet1(Bytes). + +getoctet1({0,[H|T]}) -> + {H,{0,T}}; +getoctet1({_Pos,[_,H|T]}) -> + {H,{0,T}}. + +align({0,L}) -> + {0,L}; +align({_Pos,[_H|T]}) -> + {0,T}; +align(Bytes) -> + {0,Bytes}. + +getoctets(Buffer,Num) -> +% io:format("getoctets:Buffer = ~p~nNum = ~p~n",[Buffer,Num]), + getoctets(Buffer,Num,0). + +getoctets(Buffer,0,Acc) -> + {Acc,Buffer}; +getoctets(Buffer,Num,Acc) -> + {Oct,NewBuffer} = getoctet(Buffer), + getoctets(NewBuffer,Num-1,(Acc bsl 8)+Oct). + +getoctets_as_list(Buffer,Num) -> + getoctets_as_list(Buffer,Num,[]). + +getoctets_as_list(Buffer,0,Acc) -> + {lists:reverse(Acc),Buffer}; +getoctets_as_list(Buffer,Num,Acc) -> + {Oct,NewBuffer} = getoctet(Buffer), + getoctets_as_list(NewBuffer,Num-1,[Oct|Acc]). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% set_choice(Alt,Choices,Altnum) -> ListofBitSettings +%% Alt = atom() +%% Altnum = integer() | {integer(),integer()}% number of alternatives +%% Choices = [atom()] | {[atom()],[atom()]} +%% When Choices is a tuple the first list is the Rootset and the +%% second is the Extensions and then Altnum must also be a tuple with the +%% lengths of the 2 lists +%% +set_choice(Alt,{L1,L2},{Len1,_Len2}) -> + case set_choice_tag(Alt,L1) of + N when integer(N), Len1 > 1 -> + [{bit,0}, % the value is in the root set + encode_integer([{'ValueRange',{0,Len1-1}}],N)]; + N when integer(N) -> + [{bit,0}]; % no encoding if only 0 or 1 alternative + false -> + [{bit,1}, % extension value + case set_choice_tag(Alt,L2) of + N2 when integer(N2) -> + encode_small_number(N2); + false -> + unknown_choice_alt + end] + end; +set_choice(Alt,L,Len) -> + case set_choice_tag(Alt,L) of + N when integer(N), Len > 1 -> + encode_integer([{'ValueRange',{0,Len-1}}],N); + N when integer(N) -> + []; % no encoding if only 0 or 1 alternative + false -> + [unknown_choice_alt] + end. + +set_choice_tag(Alt,Choices) -> + set_choice_tag(Alt,Choices,0). + +set_choice_tag(Alt,[Alt|_Rest],Tag) -> + Tag; +set_choice_tag(Alt,[_H|Rest],Tag) -> + set_choice_tag(Alt,Rest,Tag+1); +set_choice_tag(_Alt,[],_Tag) -> + false. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_open_type(Constraint, Value) -> CompleteList +%% Value = list of bytes of an already encoded value (the list must be flat) +%% | binary +%% Contraint = not used in this version +%% +encode_open_type(_Constraint, Val) when list(Val) -> + [encode_length(undefined,length(Val)),align, + {octets,Val}]; +encode_open_type(_Constraint, Val) when binary(Val) -> + [encode_length(undefined,size(Val)),align, + {octets,binary_to_list(Val)}]. +%% the binary_to_list is not optimal but compatible with the current solution + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_open_type(Buffer,Constraint) -> Value +%% Constraint is not used in this version +%% Buffer = [byte] with PER encoded data +%% Value = [byte] with decoded data (which must be decoded again as some type) +%% +decode_open_type(Bytes, _Constraint) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + Bytes3 = align(Bytes2), + getoctets_as_list(Bytes3,Len). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_integer(Constraint,Value,NamedNumberList) -> CompleteList +%% encode_integer(Constraint,Value) -> CompleteList +%% encode_integer(Constraint,{Name,Value}) -> CompleteList +%% +%% +encode_integer(C,V,NamedNumberList) when atom(V) -> + case lists:keysearch(V,1,NamedNumberList) of + {value,{_,NewV}} -> + encode_integer(C,NewV); + _ -> + exit({error,{asn1,{namednumber,V}}}) + end; +encode_integer(C,V,_) when integer(V) -> + encode_integer(C,V); +encode_integer(C,{Name,V},NamedNumberList) when atom(Name) -> + encode_integer(C,V,NamedNumberList). + +encode_integer(C,{Name,Val}) when atom(Name) -> + encode_integer(C,Val); + +encode_integer({Rc,_Ec},Val) -> + case (catch encode_integer(Rc,Val)) of + {'EXIT',{error,{asn1,_}}} -> + [{bit,1},encode_unconstrained_number(Val)]; + Encoded -> + [{bit,0},Encoded] + end; +encode_integer(C,Val ) when list(C) -> + case get_constraint(C,'SingleValue') of + no -> + encode_integer1(C,Val); + V when integer(V),V == Val -> + []; % a type restricted to a single value encodes to nothing + V when list(V) -> + case lists:member(Val,V) of + true -> + encode_integer1(C,Val); + _ -> + exit({error,{asn1,{illegal_value,Val}}}) + end; + _ -> + exit({error,{asn1,{illegal_value,Val}}}) + end. + +encode_integer1(C, Val) -> + case VR = get_constraint(C,'ValueRange') of + no -> + encode_unconstrained_number(Val); + {Lb,'MAX'} -> + encode_semi_constrained_number(Lb,Val); + %% positive with range + {Lb,Ub} when Val >= Lb, + Ub >= Val -> + encode_constrained_number(VR,Val); + _ -> + exit({error,{asn1,{illegal_value,VR,Val}}}) + end. + +decode_integer(Buffer,Range,NamedNumberList) -> + {Val,Buffer2} = decode_integer(Buffer,Range), + case lists:keysearch(Val,2,NamedNumberList) of + {value,{NewVal,_}} -> {NewVal,Buffer2}; + _ -> {Val,Buffer2} + end. + +decode_integer(Buffer,{Rc,_Ec}) -> + {Ext,Buffer2} = getext(Buffer), + case Ext of + 0 -> decode_integer(Buffer2,Rc); + 1 -> decode_unconstrained_number(Buffer2) + end; +decode_integer(Buffer,undefined) -> + decode_unconstrained_number(Buffer); +decode_integer(Buffer,C) -> + case get_constraint(C,'SingleValue') of + V when integer(V) -> + {V,Buffer}; + V when list(V) -> + {Val,Buffer2} = decode_integer1(Buffer,C), + case lists:member(Val,V) of + true -> + {Val,Buffer2}; + _ -> + exit({error,{asn1,{illegal_value,Val}}}) + end; + _ -> + decode_integer1(Buffer,C) + end. + +decode_integer1(Buffer,C) -> + case VR = get_constraint(C,'ValueRange') of + no -> + decode_unconstrained_number(Buffer); + {Lb, 'MAX'} -> + decode_semi_constrained_number(Buffer,Lb); + {_,_} -> + decode_constrained_number(Buffer,VR) + end. + +% X.691:10.6 Encoding of a normally small non-negative whole number +% Use this for encoding of CHOICE index if there is an extension marker in +% the CHOICE +encode_small_number({Name,Val}) when atom(Name) -> + encode_small_number(Val); +encode_small_number(Val) when Val =< 63 -> + [{bit,0},{bits,6,Val}]; +encode_small_number(Val) -> + [{bit,1},encode_semi_constrained_number(0,Val)]. + +decode_small_number(Bytes) -> + {Bit,Bytes2} = getbit(Bytes), + case Bit of + 0 -> + getbits(Bytes2,6); + 1 -> + decode_semi_constrained_number(Bytes2,{0,'MAX'}) + end. + +% X.691:10.7 Encoding of a semi-constrained whole number +%% might be an optimization encode_semi_constrained_number(0,Val) -> +encode_semi_constrained_number(C,{Name,Val}) when atom(Name) -> + encode_semi_constrained_number(C,Val); +encode_semi_constrained_number({Lb,'MAX'},Val) -> + encode_semi_constrained_number(Lb,Val); +encode_semi_constrained_number(Lb,Val) -> + Val2 = Val - Lb, + Octs = eint_positive(Val2), + [encode_length(undefined,length(Octs)),{octets,Octs}]. + +decode_semi_constrained_number(Bytes,{Lb,_}) -> + decode_semi_constrained_number(Bytes,Lb); +decode_semi_constrained_number(Bytes,Lb) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + {V,Bytes3} = getoctets(Bytes2,Len), + {V+Lb,Bytes3}. + +encode_constrained_number(Range,{Name,Val}) when atom(Name) -> + encode_constrained_number(Range,Val); +encode_constrained_number({Lb,Ub},Val) when Val >= Lb, Ub >= Val -> + Range = Ub - Lb + 1, + Val2 = Val - Lb, + if + Range == 2 -> + {bits,1,Val2}; + Range =< 4 -> + {bits,2,Val2}; + Range =< 8 -> + {bits,3,Val2}; + Range =< 16 -> + {bits,4,Val2}; + Range =< 32 -> + {bits,5,Val2}; + Range =< 64 -> + {bits,6,Val2}; + Range =< 128 -> + {bits,7,Val2}; + Range =< 255 -> + {bits,8,Val2}; + Range =< 256 -> + {octets,1,Val2}; + Range =< 65536 -> + {octets,2,Val2}; + Range =< 16#1000000 -> + Octs = eint_positive(Val2), + [encode_length({1,3},length(Octs)),{octets,Octs}]; + Range =< 16#100000000 -> + Octs = eint_positive(Val2), + [encode_length({1,4},length(Octs)),{octets,Octs}]; + Range =< 16#10000000000 -> + Octs = eint_positive(Val2), + [encode_length({1,5},length(Octs)),{octets,Octs}]; + true -> + exit({not_supported,{integer_range,Range}}) + end. + +decode_constrained_number(Buffer,{Lb,Ub}) -> + Range = Ub - Lb + 1, +% Val2 = Val - Lb, + {Val,Remain} = + if + Range == 2 -> + getbits(Buffer,1); + Range =< 4 -> + getbits(Buffer,2); + Range =< 8 -> + getbits(Buffer,3); + Range =< 16 -> + getbits(Buffer,4); + Range =< 32 -> + getbits(Buffer,5); + Range =< 64 -> + getbits(Buffer,6); + Range =< 128 -> + getbits(Buffer,7); + Range =< 255 -> + getbits(Buffer,8); + Range =< 256 -> + getoctets(Buffer,1); + Range =< 65536 -> + getoctets(Buffer,2); + Range =< 16#1000000 -> + {Len,Bytes2} = decode_length(Buffer,{1,3}), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + {dec_pos_integer(Octs),Bytes3}; + Range =< 16#100000000 -> + {Len,Bytes2} = decode_length(Buffer,{1,4}), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + {dec_pos_integer(Octs),Bytes3}; + Range =< 16#10000000000 -> + {Len,Bytes2} = decode_length(Buffer,{1,5}), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + {dec_pos_integer(Octs),Bytes3}; + true -> + exit({not_supported,{integer_range,Range}}) + end, + {Val+Lb,Remain}. + +% X.691:10.8 Encoding of an unconstrained whole number + +encode_unconstrained_number(Val) when Val >= 0 -> + Oct = eint(Val,[]), + [{debug,unconstrained_number}, + encode_length({0,'MAX'},length(Oct)), + {octets,Oct}]; +encode_unconstrained_number(Val) -> % negative + Oct = enint(Val,[]), + [{debug,unconstrained_number}, + encode_length({0,'MAX'},length(Oct)), + {octets,Oct}]. + +%% used for positive Values which don't need a sign bit +eint_positive(Val) -> + case eint(Val,[]) of + [0,B1|T] -> + [B1|T]; + T -> + T + end. + +eint(0, [B|Acc]) when B < 128 -> + [B|Acc]; +eint(N, Acc) -> + eint(N bsr 8, [N band 16#ff| Acc]). + +enint(-1, [B1|T]) when B1 > 127 -> + [B1|T]; +enint(N, Acc) -> + enint(N bsr 8, [N band 16#ff|Acc]). + +%% used for signed positive values + +%eint(Val, Ack) -> +% X = Val band 255, +% Next = Val bsr 8, +% if +% Next == 0, X >= 127 -> +% [0,X|Ack]; +% Next == 0 -> +% [X|Ack]; +% true -> +% eint(Next,[X|Ack]) +% end. + +%%% used for signed negative values +%enint(Val, Acc) -> +% NumOctets = if +% -Val < 16#80 -> 1; +% -Val < 16#8000 ->2; +% -Val < 16#800000 ->3; +% -Val < 16#80000000 ->4; +% -Val < 16#8000000000 ->5; +% -Val < 16#800000000000 ->6; +% -Val < 16#80000000000000 ->7; +% -Val < 16#8000000000000000 ->8; +% -Val < 16#800000000000000000 ->9 +% end, +% enint(Val,Acc,NumOctets). + +%enint(Val, Acc,0) -> +% Acc; +%enint(Val, Acc,NumOctets) -> +% enint(Val bsr 8,[Val band 255|Acc],NumOctets-1). + + +decode_unconstrained_number(Bytes) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + {Ints,Bytes3} = getoctets_as_list(Bytes2,Len), + {dec_integer(Ints),Bytes3}. + +dec_pos_integer(Ints) -> + decpint(Ints, 8 * (length(Ints) - 1)). +dec_integer(Ints) when hd(Ints) band 255 =< 127 -> %% Positive number + decpint(Ints, 8 * (length(Ints) - 1)); +dec_integer(Ints) -> %% Negative + decnint(Ints, 8 * (length(Ints) - 1)). + +decpint([Byte|Tail], Shift) -> + (Byte bsl Shift) bor decpint(Tail, Shift-8); +decpint([], _) -> 0. + +decnint([Byte|Tail], Shift) -> + (-128 + (Byte band 127) bsl Shift) bor decpint(Tail, Shift-8). + +minimum_octets(Val) -> + minimum_octets(Val,[]). + +minimum_octets(Val,Acc) when Val > 0 -> + minimum_octets((Val bsr 8),[Val band 16#FF|Acc]); +minimum_octets(0,Acc) -> + Acc. + + +%% X.691:10.9 Encoding of a length determinant +%%encode_small_length(undefined,Len) -> % null means no UpperBound +%% encode_small_number(Len). + +%% X.691:10.9.3.5 +%% X.691:10.9.3.7 +encode_length(undefined,Len) -> % un-constrained + if + Len < 128 -> + {octet,Len band 16#7F}; + Len < 16384 -> + {octets,2,2#1000000000000000 bor Len}; + true -> + exit({error,{asn1,{encode_length,{nyi,above_16k}}}}) + end; + +encode_length({0,'MAX'},Len) -> + encode_length(undefined,Len); +encode_length({Lb,Ub},Len) when Ub =< 65535 ,Lb >= 0 -> % constrained + encode_constrained_number({Lb,Ub},Len); +encode_length({{Lb,Ub},[]},Len) when Ub =< 65535 ,Lb >= 0 -> + %% constrained extensible + [{bit,0},encode_constrained_number({Lb,Ub},Len)]; +encode_length(SingleValue,_) when integer(SingleValue) -> + []. + +encode_small_length(Len) when Len =< 64 -> + [{bit,0},{bits,6,Len-1}]; +encode_small_length(Len) -> + [{bit,1},encode_length(undefined,Len)]. + +decode_small_length(Buffer) -> + case getbit(Buffer) of + {0,Remain} -> + {Bits,Remain2} = getbits(Remain,6), + {Bits+1,Remain2}; + {1,Remain} -> + decode_length(Remain,undefined) + end. + +decode_length(Buffer) -> + decode_length(Buffer,undefined). + +decode_length(Buffer,undefined) -> % un-constrained + Buffer2 = align(Buffer), + {Bits,_} = getbits(Buffer2,2), + case Bits of + 2 -> + {Val,Bytes3} = getoctets(Buffer2,2), + {(Val band 16#3FFF),Bytes3}; + 3 -> + exit({error,{asn1,{decode_length,{nyi,above_16k}}}}); + _ -> + {Val,Bytes3} = getoctet(Buffer2), + {Val band 16#7F,Bytes3} + end; + +decode_length(Buffer,{Lb,Ub}) when Ub =< 65535 ,Lb >= 0 -> % constrained + decode_constrained_number(Buffer,{Lb,Ub}); + +decode_length(Buffer,{{Lb,Ub},[]}) -> + case getbit(Buffer) of + {0,Buffer2} -> + decode_length(Buffer2, {Lb,Ub}) + end; + % X.691:10.9.3.5 +decode_length(Buffer,{_,_Lb,_Ub}) -> %when Len =< 127 -> % Unconstrained or large Ub + case getbit(Buffer) of + {0,Remain} -> + getbits(Remain,7); + {1,_Remain} -> + {Val,Remain2} = getoctets(Buffer,2), + {Val band 2#0111111111111111, Remain2} + end; +decode_length(Buffer,SingleValue) when integer(SingleValue) -> + {SingleValue,Buffer}. + + +% X.691:11 +encode_boolean({Name,Val}) when atom(Name) -> + encode_boolean(Val); +encode_boolean(true) -> + {bit,1}; +encode_boolean(false) -> + {bit,0}; +encode_boolean(Val) -> + exit({error,{asn1,{encode_boolean,Val}}}). + + +decode_boolean(Buffer) -> %when record(Buffer,buffer) + case getbit(Buffer) of + {1,Remain} -> {true,Remain}; + {0,Remain} -> {false,Remain} + end. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% X.691:12 +%% ENUMERATED +%% +%% encode_enumerated(C,Value,NamedNumberTup) -> CompleteList +%% +%% + +encode_enumerated(C,{Name,Value},NamedNumberList) when + atom(Name),list(NamedNumberList) -> + encode_enumerated(C,Value,NamedNumberList); + +%% ENUMERATED with extension mark +encode_enumerated(_C,{asn1_enum,Value},{_Nlist1,Nlist2}) when Value >= length(Nlist2) -> + [{bit,1},encode_small_number(Value)]; +encode_enumerated(C,Value,{Nlist1,Nlist2}) -> + case enum_search(Value,Nlist1,0) of + NewV when integer(NewV) -> + [{bit,0},encode_integer(C,NewV)]; + false -> + case enum_search(Value,Nlist2,0) of + ExtV when integer(ExtV) -> + [{bit,1},encode_small_number(ExtV)]; + false -> + exit({error,{asn1,{encode_enumerated,Value}}}) + end + end; + +encode_enumerated(C,Value,NamedNumberList) when list(NamedNumberList) -> + case enum_search(Value,NamedNumberList,0) of + NewV when integer(NewV) -> + encode_integer(C,NewV); + false -> + exit({error,{asn1,{encode_enumerated,Value}}}) + end. + +%% returns the ordinal number from 0 ,1 ... in the list where Name is found +%% or false if not found +%% +enum_search(Name,[Name|_NamedNumberList],Acc) -> + Acc; +enum_search(Name,[_H|T],Acc) -> + enum_search(Name,T,Acc+1); +enum_search(_,[],_) -> + false. % name not found !error + +%% ENUMERATED with extension marker +decode_enumerated(Buffer,C,{Ntup1,Ntup2}) when tuple(Ntup1), tuple(Ntup2) -> + {Ext,Buffer2} = getext(Buffer), + case Ext of + 0 -> % not an extension value + {Val,Buffer3} = decode_integer(Buffer2,C), + case catch (element(Val+1,Ntup1)) of + NewVal when atom(NewVal) -> {NewVal,Buffer3}; + _Error -> exit({error,{asn1,{decode_enumerated,{Val,[Ntup1,Ntup2]}}}}) + end; + 1 -> % this an extension value + {Val,Buffer3} = decode_small_number(Buffer2), + case catch (element(Val+1,Ntup2)) of + NewVal when atom(NewVal) -> {NewVal,Buffer3}; + _ -> {{asn1_enum,Val},Buffer3} + end + end; + +decode_enumerated(Buffer,C,NamedNumberTup) when tuple(NamedNumberTup) -> + {Val,Buffer2} = decode_integer(Buffer,C), + case catch (element(Val+1,NamedNumberTup)) of + NewVal when atom(NewVal) -> {NewVal,Buffer2}; + _Error -> exit({error,{asn1,{decode_enumerated,{Val,NamedNumberTup}}}}) + end. + +%%=============================================================================== +%%=============================================================================== +%%=============================================================================== +%% Bitstring value, ITU_T X.690 Chapter 8.5 +%%=============================================================================== +%%=============================================================================== +%%=============================================================================== + +%%=============================================================================== +%% encode bitstring value +%%=============================================================================== + + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% bitstring NamedBitList +%% Val can be of: +%% - [identifiers] where only named identifers are set to one, +%% the Constraint must then have some information of the +%% bitlength. +%% - [list of ones and zeroes] all bits +%% - integer value representing the bitlist +%% C is constraint Len, only valid when identifiers + + +%% when the value is a list of {Unused,BinBits}, where +%% Unused = integer(), +%% BinBits = binary(). +encode_bit_string(C,Bin={Unused,BinBits},NamedBitList) when integer(Unused), + binary(BinBits) -> + encode_bin_bit_string(C,Bin,NamedBitList); + +%% when the value is a list of named bits +encode_bit_string(C, [FirstVal | RestVal], NamedBitList) when atom(FirstVal) -> + ToSetPos = get_all_bitposes([FirstVal | RestVal], NamedBitList, []), + BitList = make_and_set_list(ToSetPos,0), + encode_bit_string(C,BitList,NamedBitList); + +encode_bit_string(C, [{bit,No} | RestVal], NamedBitList) -> + ToSetPos = get_all_bitposes([{bit,No} | RestVal], NamedBitList, []), + BitList = make_and_set_list(ToSetPos,0), + encode_bit_string(C,BitList,NamedBitList); + +%% when the value is a list of ones and zeroes + +encode_bit_string(C, BitListValue, NamedBitList) when list(BitListValue) -> + Bl1 = + case NamedBitList of + [] -> % dont remove trailing zeroes + BitListValue; + _ -> % first remove any trailing zeroes + lists:reverse(lists:dropwhile(fun(0)->true;(1)->false end, + lists:reverse(BitListValue))) + end, + BitList = [{bit,X} || X <- Bl1], + BListLen = length(BitList), + case get_constraint(C,'SizeConstraint') of + 0 -> % fixed length + []; % nothing to encode + V when integer(V),V=<16 -> % fixed length 16 bits or less + pad_list(V,BitList); + V when integer(V) -> % fixed length 16 bits or less + [align,pad_list(V,BitList)]; + {Lb,Ub} when integer(Lb),integer(Ub),BListLen<Lb -> + %% padding due to OTP-4353 + [encode_length({Lb,Ub},Lb),align,pad_list(Lb,BitList)]; + {Lb,Ub} when integer(Lb),integer(Ub) -> + [encode_length({Lb,Ub},length(BitList)),align,BitList]; + no -> + [encode_length(undefined,length(BitList)),align,BitList]; + Sc={{Lb,Ub},_} when integer(Lb),integer(Ub),BListLen<Lb -> + %% padding due to OTP-4353 + [encode_length(Sc,Lb),align,pad_list(Lb,BitList)]; + Sc -> % extension marker + [encode_length(Sc,length(BitList)),align,BitList] + end; + +%% when the value is an integer +encode_bit_string(C, IntegerVal, NamedBitList) when integer(IntegerVal)-> + BitList = int_to_bitlist(IntegerVal), + encode_bit_string(C,BitList,NamedBitList); + +%% when the value is a tuple +encode_bit_string(C,{Name,Val}, NamedBitList) when atom(Name) -> + encode_bit_string(C,Val,NamedBitList). + + +%% encode_bin_bit_string/3, when value is a tuple of Unused and BinBits. +%% Unused = integer(), +%% BinBits = binary(). + +encode_bin_bit_string(C,{Unused,BinBits},NamedBitList) -> + RemoveZerosIfNNL = + fun({NNL,BitList}) -> + case NNL of + [] -> BitList; + _ -> + lists:reverse( + lists:dropwhile(fun(0)->true;(1)->false end, + lists:reverse(BitList))) + end + end, + {OctetList,OLSize,LastBits} = + case size(BinBits) of + N when N>1 -> + IntList = binary_to_list(BinBits), + [H|T] = lists:reverse(IntList), + Bl1 = RemoveZerosIfNNL({NamedBitList,lists:reverse(int_to_bitlist(H,8-Unused))}),% lists:sublist obsolete if trailing bits are zero ! + {[{octet,X} || X <- lists:reverse(T)],size(BinBits)-1, + [{bit,X} || X <- Bl1]}; + 1 -> + <<B7:1,B6:1,B5:1,B4:1,B3:1,B2:1,B1:1,B0:1>> = BinBits, + {[],0,[{bit,X} || X <- lists:sublist([B7,B6,B5,B4,B3,B2,B1,B0],8-Unused)]}; + _ -> + {[],0,[]} + end, + case get_constraint(C,'SizeConstraint') of + 0 -> + []; + V when integer(V),V=<16 -> + [OctetList, pad_list(V,LastBits)]; + V when integer(V) -> +% [OctetList, align, pad_list(V rem 8,LastBits)]; + [align,OctetList, pad_list(V rem 8,LastBits)]; + {Lb,Ub} when integer(Lb),integer(Ub) -> + NewLastBits = maybe_pad(Lb,length(LastBits)+(OLSize*8),LastBits,NamedBitList), + [encode_length({Lb,Ub},length(NewLastBits)+(OLSize*8)), +% OctetList,align,LastBits]; + align,OctetList,NewLastBits]; + no -> + [encode_length(undefined,length(LastBits)+(OLSize*8)), +% OctetList,align,LastBits]; + align,OctetList,LastBits]; + Sc={{Lb,_},_} when integer(Lb) -> + NewLastBits = maybe_pad(Lb,length(LastBits)+(OLSize*8),LastBits,NamedBitList), + [encode_length(Sc,length(NewLastBits)+(OLSize*8)), + align,OctetList,NewLastBits]; + Sc -> + [encode_length(Sc,length(LastBits)+(OLSize*8)), +% OctetList,align,LastBits] + align,OctetList,LastBits] + end. + +maybe_pad(_,_,Bits,[]) -> + Bits; +maybe_pad(Lb,LenBits,Bits,_) when Lb>LenBits -> + pad_list(Lb,Bits); +maybe_pad(_,_,Bits,_) -> + Bits. + +%%%%%%%%%%%%%%% +%% The result is presented as a list of named bits (if possible) +%% else as a tuple {Unused,Bits}. Unused is the number of unused +%% bits, least significant bits in the last byte of Bits. Bits is +%% the BIT STRING represented as a binary. +%% +decode_compact_bit_string(Buffer, C, NamedNumberList) -> + case get_constraint(C,'SizeConstraint') of + 0 -> % fixed length + {{0,<<>>},Buffer}; + V when integer(V),V=<16 -> %fixed length 16 bits or less + compact_bit_string(Buffer,V,NamedNumberList); + V when integer(V) -> %fixed length > 16 bits + Bytes2 = align(Buffer), + compact_bit_string(Bytes2,V,NamedNumberList); + {Lb,Ub} when integer(Lb),integer(Ub) -> + {Len,Bytes2} = decode_length(Buffer,{Lb,Ub}), + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + no -> + {Len,Bytes2} = decode_length(Buffer,undefined), + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + Sc -> + {Len,Bytes2} = decode_length(Buffer,Sc), + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList) + end. + + +%%%%%%%%%%%%%%% +%% The result is presented as a list of named bits (if possible) +%% else as a list of 0 and 1. +%% +decode_bit_string(Buffer, C, NamedNumberList) -> + case get_constraint(C,'SizeConstraint') of + 0 -> % fixed length + {[],Buffer}; % nothing to encode + V when integer(V),V=<16 -> % fixed length 16 bits or less + bit_list_to_named(Buffer,V,NamedNumberList); + V when integer(V) -> % fixed length 16 bits or less + Bytes2 = align(Buffer), + bit_list_to_named(Bytes2,V,NamedNumberList); + {Lb,Ub} when integer(Lb),integer(Ub) -> + {Len,Bytes2} = decode_length(Buffer,{Lb,Ub}), + Bytes3 = align(Bytes2), + bit_list_to_named(Bytes3,Len,NamedNumberList); + no -> + {Len,Bytes2} = decode_length(Buffer,undefined), + Bytes3 = align(Bytes2), + bit_list_to_named(Bytes3,Len,NamedNumberList); + Sc -> % extension marker + {Len,Bytes2} = decode_length(Buffer,Sc), + Bytes3 = align(Bytes2), + bit_list_to_named(Bytes3,Len,NamedNumberList) + end. + + +%% if no named bits are declared we will return a +%% {Unused,Bits}. Unused = integer(), +%% Bits = binary(). +compact_bit_string(Buffer,Len,[]) -> + getbits_as_binary(Len,Buffer); % {{Unused,BinBits},NewBuffer} +compact_bit_string(Buffer,Len,NamedNumberList) -> + bit_list_to_named(Buffer,Len,NamedNumberList). + + +%% if no named bits are declared we will return a +%% BitList = [0 | 1] + +bit_list_to_named(Buffer,Len,[]) -> + getbits_as_list(Len,Buffer); + +%% if there are named bits declared we will return a named +%% BitList where the names are atoms and unnamed bits represented +%% as {bit,Pos} +%% BitList = [atom() | {bit,Pos}] +%% Pos = integer() + +bit_list_to_named(Buffer,Len,NamedNumberList) -> + {BitList,Rest} = getbits_as_list(Len,Buffer), + {bit_list_to_named1(0,BitList,NamedNumberList,[]), Rest}. + +bit_list_to_named1(Pos,[0|Bt],Names,Acc) -> + bit_list_to_named1(Pos+1,Bt,Names,Acc); +bit_list_to_named1(Pos,[1|Bt],Names,Acc) -> + case lists:keysearch(Pos,2,Names) of + {value,{Name,_}} -> + bit_list_to_named1(Pos+1,Bt,Names,[Name|Acc]); + _ -> + bit_list_to_named1(Pos+1,Bt,Names,[{bit,Pos}|Acc]) + end; +bit_list_to_named1(_Pos,[],_Names,Acc) -> + lists:reverse(Acc). + + + +%%%%%%%%%%%%%%% +%% + +int_to_bitlist(0) -> + []; +int_to_bitlist(Int) when integer(Int), Int >= 0 -> + [Int band 1 | int_to_bitlist(Int bsr 1)]. + +int_to_bitlist(_Int,0) -> + []; +int_to_bitlist(0,N) -> + [0|int_to_bitlist(0,N-1)]; +int_to_bitlist(Int,N) -> + [Int band 1 | int_to_bitlist(Int bsr 1, N-1)]. + + +%%%%%%%%%%%%%%%%%% +%% get_all_bitposes([list of named bits to set], named_bit_db, []) -> +%% [sorted_list_of_bitpositions_to_set] + +get_all_bitposes([{bit,ValPos}|Rest], NamedBitList, Ack) -> + get_all_bitposes(Rest, NamedBitList, [ValPos | Ack ]); + +get_all_bitposes([Val | Rest], NamedBitList, Ack) -> + case lists:keysearch(Val, 1, NamedBitList) of + {value, {_ValName, ValPos}} -> + get_all_bitposes(Rest, NamedBitList, [ValPos | Ack]); + _ -> + exit({error,{asn1, {bitstring_namedbit, Val}}}) + end; +get_all_bitposes([], _NamedBitList, Ack) -> + lists:sort(Ack). + +%%%%%%%%%%%%%%%%%% +%% make_and_set_list([list of positions to set to 1])-> +%% returns list with all in SetPos set. +%% in positioning in list the first element is 0, the second 1 etc.., but +%% + +make_and_set_list([XPos|SetPos], XPos) -> + [1 | make_and_set_list(SetPos, XPos + 1)]; +make_and_set_list([Pos|SetPos], XPos) -> + [0 | make_and_set_list([Pos | SetPos], XPos + 1)]; +make_and_set_list([], _XPos) -> + []. + +%%%%%%%%%%%%%%%%% +%% pad_list(N,BitList) -> PaddedList +%% returns a padded (with trailing {bit,0} elements) list of length N +%% if Bitlist contains more than N significant bits set an exit asn1_error +%% is generated + +pad_list(0,BitList) -> + case BitList of + [] -> []; + _ -> exit({error,{asn1,{range_error,{bit_string,BitList}}}}) + end; +pad_list(N,[Bh|Bt]) -> + [Bh|pad_list(N-1,Bt)]; +pad_list(N,[]) -> + [{bit,0},pad_list(N-1,[])]. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% X.691:16 +%% encode_octet_string(Constraint,ExtensionMarker,Val) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +encode_octet_string(C,{Name,Val}) when atom(Name) -> + encode_octet_string(C,false,Val); +encode_octet_string(C,Val) -> + encode_octet_string(C,false,Val). + +encode_octet_string(C,Bool,{_Name,Val}) -> + encode_octet_string(C,Bool,Val); +encode_octet_string(_,true,_) -> + exit({error,{asn1,{'not_supported',extensionmarker}}}); +encode_octet_string(C,false,Val) -> + case get_constraint(C,'SizeConstraint') of + 0 -> + []; + 1 -> + [V] = Val, + {bits,8,V}; + 2 -> + [V1,V2] = Val, + [{bits,8,V1},{bits,8,V2}]; + Sv when Sv =<65535, Sv == length(Val) -> % fixed length + [align,{octets,Val}]; + {Lb,Ub} -> + [encode_length({Lb,Ub},length(Val)),align, + {octets,Val}]; + Sv when list(Sv) -> + [encode_length({hd(Sv),lists:max(Sv)},length(Val)),align, + {octets,Val}]; + no -> + [encode_length(undefined,length(Val)),align, + {octets,Val}] + end. + +decode_octet_string(Bytes,Range) -> + decode_octet_string(Bytes,Range,false). + +decode_octet_string(Bytes,C,false) -> + case get_constraint(C,'SizeConstraint') of + 0 -> + {[],Bytes}; + 1 -> + {B1,Bytes2} = getbits(Bytes,8), + {[B1],Bytes2}; + 2 -> + {B1,Bytes2}= getbits(Bytes,8), + {B2,Bytes3}= getbits(Bytes2,8), + {[B1,B2],Bytes3}; + {_,0} -> + {[],Bytes}; + Sv when integer(Sv), Sv =<65535 -> % fixed length + Bytes2 = align(Bytes), + getoctets_as_list(Bytes2,Sv); + {Lb,Ub} -> + {Len,Bytes2} = decode_length(Bytes,{Lb,Ub}), + Bytes3 = align(Bytes2), + getoctets_as_list(Bytes3,Len); + Sv when list(Sv) -> + {Len,Bytes2} = decode_length(Bytes,{hd(Sv),lists:max(Sv)}), + Bytes3 = align(Bytes2), + getoctets_as_list(Bytes3,Len); + no -> + {Len,Bytes2} = decode_length(Bytes,undefined), + Bytes3 = align(Bytes2), + getoctets_as_list(Bytes3,Len) + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Restricted char string types +%% (NumericString, PrintableString,VisibleString,IA5String,BMPString,UniversalString) +%% X.691:26 and X.680:34-36 +%%encode_restricted_string(aligned,'BMPString',Constraints,Extension,Val) + + +encode_restricted_string(aligned,{Name,Val}) when atom(Name) -> + encode_restricted_string(aligned,Val); + +encode_restricted_string(aligned,Val) when list(Val)-> + [encode_length(undefined,length(Val)),align, + {octets,Val}]. + +encode_known_multiplier_string(aligned,StringType,C,_Ext,{Name,Val}) when atom(Name) -> + encode_known_multiplier_string(aligned,StringType,C,false,Val); + +encode_known_multiplier_string(aligned,StringType,C,_Ext,Val) -> + Result = chars_encode(C,StringType,Val), + NumBits = get_NumBits(C,StringType), + case get_constraint(C,'SizeConstraint') of + Ub when integer(Ub), Ub*NumBits =< 16 -> + case {StringType,Result} of + {'BMPString',{octets,Ol}} -> + [{bits,8,Oct}||Oct <- Ol]; + _ -> + Result + end; + 0 -> + []; + Ub when integer(Ub),Ub =<65535 -> % fixed length + [align,Result]; + {Ub,Lb} -> + [encode_length({Ub,Lb},length(Val)),align,Result]; + Vl when list(Vl) -> + [encode_length({lists:min(Vl),lists:max(Vl)},length(Val)),align,Result]; + no -> + [encode_length(undefined,length(Val)),align,Result] + end. + +decode_restricted_string(Bytes,aligned) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + Bytes3 = align(Bytes2), + getoctets_as_list(Bytes3,Len). + +decode_known_multiplier_string(Bytes,aligned,StringType,C,_Ext) -> + NumBits = get_NumBits(C,StringType), + case get_constraint(C,'SizeConstraint') of + Ub when integer(Ub), Ub*NumBits =< 16 -> + chars_decode(Bytes,NumBits,StringType,C,Ub); + Ub when integer(Ub),Ub =<65535 -> % fixed length + Bytes1 = align(Bytes), + chars_decode(Bytes1,NumBits,StringType,C,Ub); + 0 -> + {[],Bytes}; + Vl when list(Vl) -> + {Len,Bytes1} = decode_length(Bytes,{hd(Vl),lists:max(Vl)}), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,C,Len); + no -> + {Len,Bytes1} = decode_length(Bytes,undefined), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,C,Len); + {Lb,Ub}-> + {Len,Bytes1} = decode_length(Bytes,{Lb,Ub}), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,C,Len) + end. + + +encode_NumericString(C,Val) -> + encode_known_multiplier_string(aligned,'NumericString',C,false,Val). +decode_NumericString(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'NumericString',C,false). + +encode_PrintableString(C,Val) -> + encode_known_multiplier_string(aligned,'PrintableString',C,false,Val). +decode_PrintableString(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'PrintableString',C,false). + +encode_VisibleString(C,Val) -> % equivalent with ISO646String + encode_known_multiplier_string(aligned,'VisibleString',C,false,Val). +decode_VisibleString(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'VisibleString',C,false). + +encode_IA5String(C,Val) -> + encode_known_multiplier_string(aligned,'IA5String',C,false,Val). +decode_IA5String(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'IA5String',C,false). + +encode_BMPString(C,Val) -> + encode_known_multiplier_string(aligned,'BMPString',C,false,Val). +decode_BMPString(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'BMPString',C,false). + +encode_UniversalString(C,Val) -> + encode_known_multiplier_string(aligned,'UniversalString',C,false,Val). +decode_UniversalString(Bytes,C) -> + decode_known_multiplier_string(Bytes,aligned,'UniversalString',C,false). + +%% end of known-multiplier strings for which PER visible constraints are +%% applied + +encode_GeneralString(_C,Val) -> + encode_restricted_string(aligned,Val). +decode_GeneralString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_GraphicString(_C,Val) -> + encode_restricted_string(aligned,Val). +decode_GraphicString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_ObjectDescriptor(_C,Val) -> + encode_restricted_string(aligned,Val). +decode_ObjectDescriptor(Bytes) -> + decode_restricted_string(Bytes,aligned). + +encode_TeletexString(_C,Val) -> % equivalent with T61String + encode_restricted_string(aligned,Val). +decode_TeletexString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_VideotexString(_C,Val) -> + encode_restricted_string(aligned,Val). +decode_VideotexString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + + + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% getBMPChars(Bytes,Len) ->{BMPcharList,RemainingBytes} +%% +getBMPChars(Bytes,1) -> + {O1,Bytes2} = getbits(Bytes,8), + {O2,Bytes3} = getbits(Bytes2,8), + if + O1 == 0 -> + {[O2],Bytes3}; + true -> + {[{0,0,O1,O2}],Bytes3} + end; +getBMPChars(Bytes,Len) -> + getBMPChars(Bytes,Len,[]). + +getBMPChars(Bytes,0,Acc) -> + {lists:reverse(Acc),Bytes}; +getBMPChars(Bytes,Len,Acc) -> + {Octs,Bytes1} = getoctets_as_list(Bytes,2), + case Octs of + [0,O2] -> + getBMPChars(Bytes1,Len-1,[O2|Acc]); + [O1,O2]-> + getBMPChars(Bytes1,Len-1,[{0,0,O1,O2}|Acc]) + end. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% chars_encode(C,StringType,Value) -> ValueList +%% +%% encodes chars according to the per rules taking the constraint PermittedAlphabet +%% into account. +%% This function does only encode the value part and NOT the length + +chars_encode(C,StringType,Value) -> + case {StringType,get_constraint(C,'PermittedAlphabet')} of + {'UniversalString',{_,_Sv}} -> + exit({error,{asn1,{'not implemented',"UniversalString with PermittedAlphabet constraint"}}}); + {'BMPString',{_,_Sv}} -> + exit({error,{asn1,{'not implemented',"BMPString with PermittedAlphabet constraint"}}}); + _ -> + {NumBits,CharOutTab} = {get_NumBits(C,StringType),get_CharOutTab(C,StringType)}, + chars_encode2(Value,NumBits,CharOutTab) + end. + +chars_encode2([H|T],NumBits,{Min,Max,notab}) when H =< Max, H >= Min -> + [{bits,NumBits,H-Min}|chars_encode2(T,NumBits,{Min,Max,notab})]; +chars_encode2([H|T],NumBits,{Min,Max,Tab}) when H =< Max, H >= Min -> + [{bits,NumBits,element(H-Min+1,Tab)}|chars_encode2(T,NumBits,{Min,Max,Tab})]; +chars_encode2([{A,B,C,D}|T],NumBits,{Min,Max,notab}) -> + %% no value range check here (ought to be, but very expensive) +% [{bits,NumBits,(A*B*C*D)-Min}|chars_encode2(T,NumBits,{Min,Max,notab})]; + [{bits,NumBits,((((((A bsl 8) + B) bsl 8) + C) bsl 8) + D)-Min}|chars_encode2(T,NumBits,{Min,Max,notab})]; +chars_encode2([{A,B,C,D}|T],NumBits,{Min,Max,Tab}) -> + %% no value range check here (ought to be, but very expensive) +% [{bits,NumBits,element((A*B*C*D)-Min,Tab)}|chars_encode2(T,NumBits,{Min,Max,notab})]; + [{bits,NumBits,element(((((((A bsl 8)+B) bsl 8)+C) bsl 8)+D)-Min,Tab)}|chars_encode2(T,NumBits,{Min,Max,notab})]; +chars_encode2([H|_T],_,{_,_,_}) -> + exit({error,{asn1,{illegal_char_value,H}}}); +chars_encode2([],_,_) -> + []. + + +get_NumBits(C,StringType) -> + case get_constraint(C,'PermittedAlphabet') of + {'SingleValue',Sv} -> + charbits(length(Sv),aligned); + no -> + case StringType of + 'IA5String' -> + charbits(128,aligned); % 16#00..16#7F + 'VisibleString' -> + charbits(95,aligned); % 16#20..16#7E + 'PrintableString' -> + charbits(74,aligned); % [$\s,$',$(,$),$+,$,,$-,$.,$/,"0123456789",$:,$=,$?,$A..$Z,$a..$z + 'NumericString' -> + charbits(11,aligned); % $ ,"0123456789" + 'UniversalString' -> + 32; + 'BMPString' -> + 16 + end + end. + +%%Maybe used later +%%get_MaxChar(C,StringType) -> +%% case get_constraint(C,'PermittedAlphabet') of +%% {'SingleValue',Sv} -> +%% lists:nth(length(Sv),Sv); +%% no -> +%% case StringType of +%% 'IA5String' -> +%% 16#7F; % 16#00..16#7F +%% 'VisibleString' -> +%% 16#7E; % 16#20..16#7E +%% 'PrintableString' -> +%% $z; % [$\s,$',$(,$),$+,$,,$-,$.,$/,"0123456789",$:,$=,$?,$A..$Z,$a..$z +%% 'NumericString' -> +%% $9; % $ ,"0123456789" +%% 'UniversalString' -> +%% 16#ffffffff; +%% 'BMPString' -> +%% 16#ffff +%% end +%% end. + +%%Maybe used later +%%get_MinChar(C,StringType) -> +%% case get_constraint(C,'PermittedAlphabet') of +%% {'SingleValue',Sv} -> +%% hd(Sv); +%% no -> +%% case StringType of +%% 'IA5String' -> +%% 16#00; % 16#00..16#7F +%% 'VisibleString' -> +%% 16#20; % 16#20..16#7E +%% 'PrintableString' -> +%% $\s; % [$\s,$',$(,$),$+,$,,$-,$.,$/,"0123456789",$:,$=,$?,$A..$Z,$a..$z +%% 'NumericString' -> +%% $\s; % $ ,"0123456789" +%% 'UniversalString' -> +%% 16#00; +%% 'BMPString' -> +%% 16#00 +%% end +%% end. + +get_CharOutTab(C,StringType) -> + get_CharTab(C,StringType,out). + +get_CharInTab(C,StringType) -> + get_CharTab(C,StringType,in). + +get_CharTab(C,StringType,InOut) -> + case get_constraint(C,'PermittedAlphabet') of + {'SingleValue',Sv} -> + get_CharTab2(C,StringType,hd(Sv),lists:max(Sv),Sv,InOut); + no -> + case StringType of + 'IA5String' -> + {0,16#7F,notab}; + 'VisibleString' -> + get_CharTab2(C,StringType,16#20,16#7F,notab,InOut); + 'PrintableString' -> + Chars = lists:sort( + " '()+,-./0123456789:=?ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"), + get_CharTab2(C,StringType,hd(Chars),lists:max(Chars),Chars,InOut); + 'NumericString' -> + get_CharTab2(C,StringType,16#20,$9," 0123456789",InOut); + 'UniversalString' -> + {0,16#FFFFFFFF,notab}; + 'BMPString' -> + {0,16#FFFF,notab} + end + end. + +get_CharTab2(C,StringType,Min,Max,Chars,InOut) -> + BitValMax = (1 bsl get_NumBits(C,StringType))-1, + if + Max =< BitValMax -> + {0,Max,notab}; + true -> + case InOut of + out -> + {Min,Max,create_char_tab(Min,Chars)}; + in -> + {Min,Max,list_to_tuple(Chars)} + end + end. + +create_char_tab(Min,L) -> + list_to_tuple(create_char_tab(Min,L,0)). +create_char_tab(Min,[Min|T],V) -> + [V|create_char_tab(Min+1,T,V+1)]; +create_char_tab(_Min,[],_V) -> + []; +create_char_tab(Min,L,V) -> + [false|create_char_tab(Min+1,L,V)]. + +%% This very inefficient and should be moved to compiletime +charbits(NumOfChars,aligned) -> + case charbits(NumOfChars) of + 1 -> 1; + 2 -> 2; + B when B > 2, B =< 4 -> 4; + B when B > 4, B =< 8 -> 8; + B when B > 8, B =< 16 -> 16; + B when B > 16, B =< 32 -> 32 + end. + +charbits(NumOfChars) when NumOfChars =< 2 -> 1; +charbits(NumOfChars) when NumOfChars =< 4 -> 2; +charbits(NumOfChars) when NumOfChars =< 8 -> 3; +charbits(NumOfChars) when NumOfChars =< 16 -> 4; +charbits(NumOfChars) when NumOfChars =< 32 -> 5; +charbits(NumOfChars) when NumOfChars =< 64 -> 6; +charbits(NumOfChars) when NumOfChars =< 128 -> 7; +charbits(NumOfChars) when NumOfChars =< 256 -> 8; +charbits(NumOfChars) when NumOfChars =< 512 -> 9; +charbits(NumOfChars) when NumOfChars =< 1024 -> 10; +charbits(NumOfChars) when NumOfChars =< 2048 -> 11; +charbits(NumOfChars) when NumOfChars =< 4096 -> 12; +charbits(NumOfChars) when NumOfChars =< 8192 -> 13; +charbits(NumOfChars) when NumOfChars =< 16384 -> 14; +charbits(NumOfChars) when NumOfChars =< 32768 -> 15; +charbits(NumOfChars) when NumOfChars =< 65536 -> 16; +charbits(NumOfChars) when integer(NumOfChars) -> + 16 + charbits1(NumOfChars bsr 16). + +charbits1(0) -> + 0; +charbits1(NumOfChars) -> + 1 + charbits1(NumOfChars bsr 1). + + +chars_decode(Bytes,_,'BMPString',C,Len) -> + case get_constraint(C,'PermittedAlphabet') of + no -> + getBMPChars(Bytes,Len); + _ -> + exit({error,{asn1, + {'not implemented', + "BMPString with PermittedAlphabet constraint"}}}) + end; +chars_decode(Bytes,NumBits,StringType,C,Len) -> + CharInTab = get_CharInTab(C,StringType), + chars_decode2(Bytes,CharInTab,NumBits,Len). + + +chars_decode2(Bytes,CharInTab,NumBits,Len) -> + chars_decode2(Bytes,CharInTab,NumBits,Len,[]). + +chars_decode2(Bytes,_CharInTab,_NumBits,0,Acc) -> + {lists:reverse(Acc),Bytes}; +chars_decode2(Bytes,{Min,Max,notab},NumBits,Len,Acc) when NumBits > 8 -> + {Char,Bytes2} = getbits(Bytes,NumBits), + Result = case minimum_octets(Char+Min) of + [NewChar] -> NewChar; + [C1,C2] -> {0,0,C1,C2}; + [C1,C2,C3] -> {0,C1,C2,C3}; + [C1,C2,C3,C4] -> {C1,C2,C3,C4} + end, + chars_decode2(Bytes2,{Min,Max,notab},NumBits,Len -1,[Result|Acc]); +chars_decode2(Bytes,{Min,Max,notab},NumBits,Len,Acc) -> + {Char,Bytes2} = getbits(Bytes,NumBits), + chars_decode2(Bytes2,{Min,Max,notab},NumBits,Len -1,[Char+Min|Acc]); + +%% BMPString and UniversalString with PermittedAlphabet is currently not supported +chars_decode2(Bytes,{Min,Max,CharInTab},NumBits,Len,Acc) -> + {Char,Bytes2} = getbits(Bytes,NumBits), + chars_decode2(Bytes2,{Min,Max,CharInTab},NumBits,Len -1,[element(Char+1,CharInTab)|Acc]). + + + % X.691:17 +encode_null({Name,Val}) when atom(Name) -> + encode_null(Val); +encode_null(_) -> []. % encodes to nothing + +decode_null(Bytes) -> + {'NULL',Bytes}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_object_identifier(Val) -> CompleteList +%% encode_object_identifier({Name,Val}) -> CompleteList +%% Val -> {Int1,Int2,...,IntN} % N >= 2 +%% Name -> atom() +%% Int1 -> integer(0..2) +%% Int2 -> integer(0..39) when Int1 (0..1) else integer() +%% Int3-N -> integer() +%% CompleteList -> [{bits,8,Val}|{octets,Ol}|align|...] +%% +encode_object_identifier({Name,Val}) when atom(Name) -> + encode_object_identifier(Val); +encode_object_identifier(Val) -> + Octets = e_object_identifier(Val,notag), + [{debug,object_identifier},encode_length(undefined,length(Octets)),{octets,Octets}]. + +%% This code is copied from asn1_encode.erl (BER) and corrected and modified + +e_object_identifier({'OBJECT IDENTIFIER',V},DoTag) -> + e_object_identifier(V,DoTag); +e_object_identifier({Cname,V},DoTag) when atom(Cname),tuple(V) -> + e_object_identifier(tuple_to_list(V),DoTag); +e_object_identifier({Cname,V},DoTag) when atom(Cname),list(V) -> + e_object_identifier(V,DoTag); +e_object_identifier(V,DoTag) when tuple(V) -> + e_object_identifier(tuple_to_list(V),DoTag); + +% E1 = 0|1|2 and (E2 < 40 when E1 = 0|1) +e_object_identifier([E1,E2|Tail],_DoTag) when E1 =< 2 -> + Head = 40*E1 + E2, % weird + Res = e_object_elements([Head|Tail]), +% dotag(DoTag,[6],elength(length(Res)+1),[Head|Res]), + Res. + +e_object_elements([]) -> + []; +e_object_elements([H|T]) -> + lists:append(e_object_element(H),e_object_elements(T)). + +e_object_element(Num) when Num < 128 -> + [Num]; +% must be changed to handle more than 2 octets +e_object_element(Num) -> %% when Num < ??? + Left = ((Num band 2#11111110000000) bsr 7) bor 2#10000000, + Right = Num band 2#1111111 , + [Left,Right]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_object_identifier(Bytes) -> {ObjId,RemainingBytes} +%% ObjId -> {integer(),integer(),...} % at least 2 integers +%% RemainingBytes -> [integer()] when integer() (0..255) +decode_object_identifier(Bytes) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + [First|Rest] = dec_subidentifiers(Octs,0,[]), + Idlist = if + First < 40 -> + [0,First|Rest]; + First < 80 -> + [1,First - 40|Rest]; + true -> + [2,First - 80|Rest] + end, + {list_to_tuple(Idlist),Bytes3}. + +dec_subidentifiers([H|T],Av,Al) when H >=16#80 -> + dec_subidentifiers(T,(Av bsl 7) + (H band 16#7F),Al); +dec_subidentifiers([H|T],Av,Al) -> + dec_subidentifiers(T,0,[(Av bsl 7) + H |Al]); +dec_subidentifiers([],_Av,Al) -> + lists:reverse(Al). + +get_constraint(C,Key) -> + case lists:keysearch(Key,1,C) of + false -> + no; + {value,{_,V}} -> + V + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% complete(InList) -> ByteList +%% Takes a coded list with bits and bytes and converts it to a list of bytes +%% Should be applied as the last step at encode of a complete ASN.1 type +%% +complete(InList) when list(InList) -> + complete(InList,[],0); +complete(InList) -> + complete([InList],[],0). + +complete([{debug,_}|T], Acc, Acclen) -> + complete(T,Acc,Acclen); +complete([H|T],Acc,Acclen) when list(H) -> + complete(lists:concat([H,T]),Acc,Acclen); + + +complete([{octets,N,Val}|T],Acc,Acclen) when N =< 4 ,integer(Val) -> + Newval = case N of + 1 -> + Val4 = Val band 16#FF, + [Val4]; + 2 -> + Val3 = (Val bsr 8) band 16#FF, + Val4 = Val band 16#FF, + [Val3,Val4]; + 3 -> + Val2 = (Val bsr 16) band 16#FF, + Val3 = (Val bsr 8) band 16#FF, + Val4 = Val band 16#FF, + [Val2,Val3,Val4]; + 4 -> + Val1 = (Val bsr 24) band 16#FF, + Val2 = (Val bsr 16) band 16#FF, + Val3 = (Val bsr 8) band 16#FF, + Val4 = Val band 16#FF, + [Val1,Val2,Val3,Val4] + end, + complete([{octets,Newval}|T],Acc,Acclen); + +complete([{octets,Oct}|T],[],_Acclen) when list(Oct) -> + complete(T,lists:reverse(Oct),0); +complete([{octets,Oct}|T],[Hacc|Tacc],Acclen) when list(Oct) -> + Rest = 8 - Acclen, + if + Rest == 8 -> + complete(T,lists:concat([lists:reverse(Oct),[Hacc|Tacc]]),0); + true -> + complete(T,lists:concat([lists:reverse(Oct),[Hacc bsl Rest|Tacc]]),0) + end; + +complete([{bit,Val}|T], Acc, Acclen) -> + complete([{bits,1,Val}|T],Acc,Acclen); +complete([{octet,Val}|T], Acc, Acclen) -> + complete([{octets,1,Val}|T],Acc,Acclen); + +complete([{bits,N,Val}|T], Acc, 0) when N =< 8 -> + complete(T,[Val|Acc],N); +complete([{bits,N,Val}|T], [Hacc|Tacc], Acclen) when N =< 8 -> + Rest = 8 - Acclen, + if + Rest >= N -> + complete(T,[(Hacc bsl N) + Val|Tacc],(Acclen+N) rem 8); + true -> + Diff = N - Rest, + NewHacc = (Hacc bsl Rest) + (Val bsr Diff), + Mask = element(Diff,{1,3,7,15,31,63,127,255}), + complete(T,[(Val band Mask),NewHacc|Tacc],(Acclen+N) rem 8) + end; +complete([{bits,N,Val}|T], Acc, Acclen) -> % N > 8 + complete([{bits,N-8,Val bsr 8},{bits,8,Val band 255}|T],Acc,Acclen); + +complete([align|T],Acc,0) -> + complete(T,Acc,0); +complete([align|T],[Hacc|Tacc],Acclen) -> + Rest = 8 - Acclen, + complete(T,[Hacc bsl Rest|Tacc],0); +complete([{octets,_N,Val}|T],Acc,Acclen) when list(Val) -> % no security check here + complete([{octets,Val}|T],Acc,Acclen); + +complete([],[],0) -> + [0]; % a complete encoding must always be at least 1 byte +complete([],Acc,0) -> + lists:reverse(Acc); +complete([],[Hacc|Tacc],Acclen) when Acclen > 0-> + Rest = 8 - Acclen, + NewHacc = Hacc bsl Rest, + lists:reverse([NewHacc|Tacc]). |