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Diffstat (limited to 'lib/asn1/src/asn1rt_per_bin.erl')
| -rw-r--r-- | lib/asn1/src/asn1rt_per_bin.erl | 2287 |
1 files changed, 2287 insertions, 0 deletions
diff --git a/lib/asn1/src/asn1rt_per_bin.erl b/lib/asn1/src/asn1rt_per_bin.erl new file mode 100644 index 0000000000..6bbca26209 --- /dev/null +++ b/lib/asn1/src/asn1rt_per_bin.erl @@ -0,0 +1,2287 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2001-2009. 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(asn1rt_per_bin). + +%% 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, fixoptionals/3, + fixextensions/2, + getext/1, getextension/2, skipextensions/3, getbit/1, getchoice/3 ]). +-export([getoptionals/2, getoptionals2/2, set_choice/3, 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([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, + encode_real/1, decode_real/1, + encode_relative_oid/1, decode_relative_oid/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_UTF8String/1, decode_UTF8String/1, + encode_BMPString/2, decode_BMPString/2, + encode_IA5String/2, decode_IA5String/2, + encode_NumericString/2, decode_NumericString/2, + encode_ObjectDescriptor/2, decode_ObjectDescriptor/1 + ]). +-export([complete_bytes/1]). + +-define('16K',16384). +-define('32K',32768). +-define('64K',65536). + +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,Tuple) when is_tuple(Tuple) -> + Tuple; +list_to_record(Name,List) when is_list(List) -> + list_to_tuple([Name|List]). + +%%-------------------------------------------------------- +%% setchoiceext(InRootSet) -> [{bit,X}] +%% X is set to 1 when InRootSet==false +%% X is set to 0 when InRootSet==true +%% +setchoiceext(true) -> + [{debug,choiceext},{bits,1,0}]; +setchoiceext(false) -> + [{debug,choiceext},{bits,1,1}]. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% setext(true|false) -> CompleteList +%% + +setext(false) -> + [{debug,ext},{bits,1,0}]; +setext(true) -> + [{debug,ext},{bits,1,1}]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% This version of fixoptionals/2 are left only because of +%% backward compatibility with older generates + +fixoptionals(OptList,Val) when is_tuple(Val) -> + fixoptionals1(OptList,Val,[]); + +fixoptionals(OptList,Val) when is_list(Val) -> + fixoptionals1(OptList,Val,1,[],[]). + +fixoptionals1([],Val,Acc) -> + %% return {Val,Opt} + {Val,lists:reverse(Acc)}; +fixoptionals1([{_,Pos}|Ot],Val,Acc) -> + case element(Pos+1,Val) of + asn1_NOVALUE -> fixoptionals1(Ot,Val,[0|Acc]); + asn1_DEFAULT -> fixoptionals1(Ot,Val,[0|Acc]); + _ -> fixoptionals1(Ot,Val,[1|Acc]) + end. + + +fixoptionals1([{Name,Pos}|Ot],[{Name,Val}|Vt],_Opt,Acc1,Acc2) -> + fixoptionals1(Ot,Vt,Pos+1,[1|Acc1],[{Name,Val}|Acc2]); +fixoptionals1([{_Name,Pos}|Ot],V,Pos,Acc1,Acc2) -> + fixoptionals1(Ot,V,Pos+1,[0|Acc1],[asn1_NOVALUE|Acc2]); +fixoptionals1(O,[Vh|Vt],Pos,Acc1,Acc2) -> + fixoptionals1(O,Vt,Pos+1,Acc1,[Vh|Acc2]); +fixoptionals1([],[Vh|Vt],Pos,Acc1,Acc2) -> + fixoptionals1([],Vt,Pos+1,Acc1,[Vh|Acc2]); +fixoptionals1([],[],_,Acc1,Acc2) -> + % return {Val,Opt} + {list_to_tuple([asn1_RECORDNAME|lists:reverse(Acc2)]),lists:reverse(Acc1)}. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% This is the new fixoptionals/3 which is used by the new generates +%% +fixoptionals(OptList,OptLength,Val) when is_tuple(Val) -> + Bits = fixoptionals(OptList,Val,0), + {Val,{bits,OptLength,Bits}}; + +fixoptionals([],_Val,Acc) -> + %% Optbits + Acc; +fixoptionals([{Pos,DefVal}|Ot],Val,Acc) -> + case element(Pos,Val) of + asn1_DEFAULT -> fixoptionals(Ot,Val,Acc bsl 1); + DefVal -> fixoptionals(Ot,Val,Acc bsl 1); + _ -> fixoptionals(Ot,Val,(Acc bsl 1) + 1) + end; +fixoptionals([Pos|Ot],Val,Acc) -> + case element(Pos,Val) of + asn1_NOVALUE -> fixoptionals(Ot,Val,Acc bsl 1); + asn1_DEFAULT -> fixoptionals(Ot,Val,Acc bsl 1); + _ -> fixoptionals(Ot,Val,(Acc bsl 1) + 1) + end. + + +getext(Bytes) when is_tuple(Bytes) -> + getbit(Bytes); +getext(Bytes) when is_binary(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,_,1) -> + decode_small_number(Bytes); +getchoice(Bytes,NumChoices,0) -> + decode_constrained_number(Bytes,{0,NumChoices-1}). + +%% old version kept for backward compatibility with generates from R7B +getoptionals(Bytes,NumOpt) -> + {Blist,Bytes1} = getbits_as_list(NumOpt,Bytes), + {list_to_tuple(Blist),Bytes1}. + +%% new version used in generates from r8b_patch/3 and later +getoptionals2(Bytes,NumOpt) -> + getbits(Bytes,NumOpt). + + +%% 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 is_binary(Bytes) -> + getbits_as_binary(Num,{0,Bytes}); +getbits_as_binary(0,Buffer) -> + {{0,<<>>},Buffer}; +getbits_as_binary(Num,{0,Bin}) when Num > 16 -> + Used = Num rem 8, + Pad = (8 - Used) rem 8, +% Nbytes = Num div 8, + <<Bits:Num,_:Pad,RestBin/binary>> = Bin, + {{Pad,<<Bits:Num,0:Pad>>},RestBin}; +getbits_as_binary(Num,Buffer={_Used,_Bin}) -> % Unaligned buffer + %% Num =< 16, + {Bits2,Buffer2} = getbits(Buffer,Num), + Pad = (8 - (Num rem 8)) rem 8, + {{Pad,<<Bits2:Num,0:Pad>>},Buffer2}. + + +% 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) when is_binary(Bytes) -> + getbits_as_list(Num,{0,Bytes},[]); +getbits_as_list(Num,Bytes) -> + getbits_as_list(Num,Bytes,[]). + +%% If buffer is empty and nothing more will be picked. +getbits_as_list(0, B, Acc) -> + {lists:reverse(Acc),B}; +%% If first byte in buffer is full and at least one byte will be picked, +%% then pick one byte. +getbits_as_list(N,{0,Bin},Acc) when N >= 8 -> + <<B7:1,B6:1,B5:1,B4:1,B3:1,B2:1,B1:1,B0:1,Rest/binary>> = Bin, + getbits_as_list(N-8,{0,Rest},[B0,B1,B2,B3,B4,B5,B6,B7|Acc]); +getbits_as_list(N,{Used,Bin},Acc) when N >= 4, Used =< 4 -> + NewUsed = Used + 4, + Rem = 8 - NewUsed, + <<_:Used,B3:1,B2:1,B1:1,B0:1,_:Rem, Rest/binary>> = Bin, + NewRest = case Rem of 0 -> Rest; _ -> Bin end, + getbits_as_list(N-4,{NewUsed rem 8,NewRest},[B0,B1,B2,B3|Acc]); +getbits_as_list(N,{Used,Bin},Acc) when N >= 2, Used =< 6 -> + NewUsed = Used + 2, + Rem = 8 - NewUsed, + <<_:Used,B1:1,B0:1,_:Rem, Rest/binary>> = Bin, + NewRest = case Rem of 0 -> Rest; _ -> Bin end, + getbits_as_list(N-2,{NewUsed rem 8,NewRest},[B0,B1|Acc]); +getbits_as_list(N,{Used,Bin},Acc) when Used =< 7 -> + NewUsed = Used + 1, + Rem = 8 - NewUsed, + <<_:Used,B0:1,_:Rem, Rest/binary>> = Bin, + NewRest = case Rem of 0 -> Rest; _ -> Bin end, + getbits_as_list(N-1,{NewUsed rem 8,NewRest},[B0|Acc]). + + +getbit({7,<<_:7,B:1,Rest/binary>>}) -> + {B,{0,Rest}}; +getbit({0,Buffer = <<B:1,_:7,_/binary>>}) -> + {B,{1,Buffer}}; +getbit({Used,Buffer}) -> + Unused = (8 - Used) - 1, + <<_:Used,B:1,_:Unused,_/binary>> = Buffer, + {B,{Used+1,Buffer}}; +getbit(Buffer) when is_binary(Buffer) -> + getbit({0,Buffer}). + + +getbits({0,Buffer},Num) when (Num rem 8) == 0 -> + <<Bits:Num,Rest/binary>> = Buffer, + {Bits,{0,Rest}}; +getbits({Used,Bin},Num) -> + NumPlusUsed = Num + Used, + NewUsed = NumPlusUsed rem 8, + Unused = (8-NewUsed) rem 8, + case Unused of + 0 -> + <<_:Used,Bits:Num,Rest/binary>> = Bin, + {Bits,{0,Rest}}; + _ -> + Bytes = NumPlusUsed div 8, + <<_:Used,Bits:Num,_UBits:Unused,_/binary>> = Bin, + <<_:Bytes/binary,Rest/binary>> = Bin, + {Bits,{NewUsed,Rest}} + end; +getbits(Bin,Num) when is_binary(Bin) -> + getbits({0,Bin},Num). + + + +% getoctet(Bytes) when is_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/binary>>}) -> + {0,T}; +align(Bytes) -> + {0,Bytes}. + +%% First align buffer, then pick the first Num octets. +%% Returns octets as an integer with bit significance as in buffer. +getoctets({0,Buffer},Num) -> + <<Val:Num/integer-unit:8,RestBin/binary>> = Buffer, + {Val,{0,RestBin}}; +getoctets({U,<<_Padding,Rest/binary>>},Num) when U /= 0 -> + getoctets({0,Rest},Num); +getoctets(Buffer,Num) when is_binary(Buffer) -> + getoctets({0,Buffer},Num). +% 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]). + +%% First align buffer, then pick the first Num octets. +%% Returns octets as a binary +getoctets_as_bin({0,Bin},Num)-> + <<Octets:Num/binary,RestBin/binary>> = Bin, + {Octets,{0,RestBin}}; +getoctets_as_bin({_U,Bin},Num) -> + <<_Padding,Octets:Num/binary,RestBin/binary>> = Bin, + {Octets,{0,RestBin}}; +getoctets_as_bin(Bin,Num) when is_binary(Bin) -> + getoctets_as_bin({0,Bin},Num). + +%% same as above but returns octets as a List +getoctets_as_list(Buffer,Num) -> + {Bin,Buffer2} = getoctets_as_bin(Buffer,Num), + {binary_to_list(Bin),Buffer2}. +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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 is_integer(N), Len1 > 1 -> + [{bits,1,0}, % the value is in the root set + encode_integer([{'ValueRange',{0,Len1-1}}],N)]; + N when is_integer(N) -> + [{bits,1,0}]; % no encoding if only 0 or 1 alternative + false -> + [{bits,1,1}, % extension value + case set_choice_tag(Alt,L2) of + N2 when is_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 is_integer(N), Len > 1 -> + encode_integer([{'ValueRange',{0,Len-1}}],N); + N when is_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. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_fragmented_XXX; decode of values encoded fragmented according +%% to ITU-T X.691 clause 10.9.3.8. The unit (XXX) is either bits, octets, +%% characters or number of components (in a choice,sequence or similar). +%% Buffer is a buffer {Used, Bin}. +%% C is the constrained length. +%% If the buffer is not aligned, this function does that. +decode_fragmented_bits({0,Buffer},C) -> + decode_fragmented_bits(Buffer,C,[]); +decode_fragmented_bits({_N,<<_,Bs/binary>>},C) -> + decode_fragmented_bits(Bs,C,[]). + +decode_fragmented_bits(<<3:2,Len:6,Bin/binary>>,C,Acc) -> + {Value,Bin2} = split_binary(Bin, Len * ?'16K'), + decode_fragmented_bits(Bin2,C,[Value,Acc]); +decode_fragmented_bits(<<0:1,0:7,Bin/binary>>,C,Acc) -> + BinBits = list_to_binary(lists:reverse(Acc)), + case C of + Int when is_integer(Int),C == size(BinBits) -> + {BinBits,{0,Bin}}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,BinBits}}}) + end; +decode_fragmented_bits(<<0:1,Len:7,Bin/binary>>,C,Acc) -> + Result = {BinBits,{Used,_Rest}} = + case (Len rem 8) of + 0 -> + <<Value:Len/binary-unit:1,Bin2/binary>> = Bin, + {list_to_binary(lists:reverse([Value|Acc])),{0,Bin2}}; + Rem -> + Bytes = Len div 8, + U = 8 - Rem, + <<Value:Bytes/binary-unit:8,Bits1:Rem,Bits2:U,Bin2/binary>> = Bin, + {list_to_binary(lists:reverse([Bits1 bsl U,Value|Acc])), + {Rem,<<Bits2,Bin2/binary>>}} + end, + case C of + Int when is_integer(Int),C == (size(BinBits) - ((8 - Used) rem 8)) -> + Result; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,BinBits}}}) + end. + + +decode_fragmented_octets({0,Bin},C) -> + decode_fragmented_octets(Bin,C,[]). + +decode_fragmented_octets(<<3:2,Len:6,Bin/binary>>,C,Acc) -> + {Value,Bin2} = split_binary(Bin,Len * ?'16K'), + decode_fragmented_octets(Bin2,C,[Value,Acc]); +decode_fragmented_octets(<<0:1,0:7,Bin/binary>>,C,Acc) -> + Octets = list_to_binary(lists:reverse(Acc)), + case C of + Int when is_integer(Int), C == size(Octets) -> + {Octets,{0,Bin}}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,Octets}}}) + end; +decode_fragmented_octets(<<0:1,Len:7,Bin/binary>>,C,Acc) -> + <<Value:Len/binary-unit:8,Bin2/binary>> = Bin, + BinOctets = list_to_binary(lists:reverse([Value|Acc])), + case C of + Int when is_integer(Int),size(BinOctets) == Int -> + {BinOctets,Bin2}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,BinOctets}}}) + end. + + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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(_C, Val) when is_list(Val) -> + Bin = list_to_binary(Val), + [encode_length(undefined,size(Bin)),{octets,Bin}]; % octets implies align +encode_open_type(_C, Val) when is_binary(Val) -> + [encode_length(undefined,size(Val)),{octets,Val}]. % octets implies align +%% 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, _C) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + getoctets_as_bin(Bytes2,Len). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_integer(Constraint,Value,NamedNumberList) -> CompleteList +%% encode_integer(Constraint,Value) -> CompleteList +%% encode_integer(Constraint,{Name,Value}) -> CompleteList +%% +%% +encode_integer(C,V,NamedNumberList) when is_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,_NamedNumberList) when is_integer(V) -> + encode_integer(C,V); +encode_integer(C,{Name,V},NamedNumberList) when is_atom(Name) -> + encode_integer(C,V,NamedNumberList). + +encode_integer(C,{Name,Val}) when is_atom(Name) -> + encode_integer(C,Val); + +encode_integer([{Rc,_Ec}],Val) when is_tuple(Rc) -> % XXX when is this invoked? First argument most often a list,...Ok this is the extension case...but it doesn't work. + case (catch encode_integer([Rc],Val)) of + {'EXIT',{error,{asn1,_}}} -> + [{bits,1,1},encode_unconstrained_number(Val)]; + Encoded -> + [{bits,1,0},Encoded] + end; +encode_integer(C,Val ) when is_list(C) -> + case get_constraint(C,'SingleValue') of + no -> + encode_integer1(C,Val); + V when is_integer(V),V == Val -> + []; % a type restricted to a single value encodes to nothing + V when is_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}]) when is_tuple(Rc) -> + {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 is_integer(V) -> + {V,Buffer}; + V when is_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 is_atom(Name) -> + encode_small_number(Val); +encode_small_number(Val) when Val =< 63 -> +% [{bits,1,0},{bits,6,Val}]; + [{bits,7,Val}]; % same as above but more efficient +encode_small_number(Val) -> + [{bits,1,1},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) + 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 is_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, + Oct = eint_positive(Val2), + Len = length(Oct), + if + Len < 128 -> + {octets,[Len|Oct]}; % equiv with encode_length(undefined,Len) but faster + true -> + [encode_length(undefined,Len),{octets,Oct}] + end. + +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 is_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 == 1 -> + []; + 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,[Val2]}; + Range =< 65536 -> + {octets,<<Val2:16>>}; + Range =< 16#1000000 -> + Octs = eint_positive(Val2), + [{bits,2,length(Octs)-1},{octets,Octs}]; + Range =< 16#100000000 -> + Octs = eint_positive(Val2), + [{bits,2,length(Octs)-1},{octets,Octs}]; + Range =< 16#10000000000 -> + Octs = eint_positive(Val2), + [{bits,3,length(Octs)-1},{octets,Octs}]; + true -> + exit({not_supported,{integer_range,Range}}) + end; +encode_constrained_number(Range,Val) -> + exit({error,{asn1,{integer_range,Range,value,Val}}}). + + +decode_constrained_number(Buffer,{Lb,Ub}) -> + Range = Ub - Lb + 1, + % Val2 = Val - Lb, + {Val,Remain} = + if + Range == 1 -> + {0,Buffer}; + 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,[]), + Len = length(Oct), + if + Len < 128 -> + {octets,[Len|Oct]}; % equiv with encode_length(undefined,Len) but faster + true -> + [encode_length(undefined,Len),{octets,Oct}] + end; +encode_unconstrained_number(Val) -> % negative + Oct = enint(Val,[]), + Len = length(Oct), + if + Len < 128 -> + {octets,[Len|Oct]}; % equiv with encode_length(undefined,Len) but faster + true -> + [encode_length(undefined,Len),{octets,Oct}] + end. + + +%% used for positive Values which don't need a sign bit +%% returns a binary +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]). + +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 -> + {octets,[Len]}; + Len < 16384 -> + {octets,<<2:2,Len:14>>}; + true -> % should be able to endode length >= 16384 + exit({error,{asn1,{encode_length,{nyi,above_16k}}}}) + end; + +encode_length({0,'MAX'},Len) -> + encode_length(undefined,Len); +encode_length(Vr={Lb,Ub},Len) when Ub =< 65535 ,Lb >= 0 -> % constrained + encode_constrained_number(Vr,Len); +encode_length({Lb,_Ub},Len) when is_integer(Lb), Lb >= 0 -> % Ub > 65535 + encode_length(undefined,Len); +encode_length({Vr={Lb,Ub},Ext},Len) + when Ub =< 65535 ,Lb >= 0, Len=<Ub, is_list(Ext) -> + %% constrained extensible + [{bits,1,0},encode_constrained_number(Vr,Len)]; +encode_length({{Lb,_Ub},Ext},Len) when is_list(Ext) -> + [{bits,1,1},encode_semi_constrained_number(Lb,Len)]; +encode_length(SingleValue,_Len) when is_integer(SingleValue) -> + []. + +%% X.691 10.9.3.4 (only used for length of bitmap that prefixes extension +%% additions in a sequence or set +encode_small_length(Len) when Len =< 64 -> +%% [{bits,1,0},{bits,6,Len-1}]; + {bits,7,Len-1}; % the same as above but more efficient +encode_small_length(Len) -> + [{bits,1,1},encode_length(undefined,Len)]. + +% decode_small_length({Used,<<_:Used,0:1,Num:6,_:((8-Used+1) rem 8),Rest/binary>>}) -> +% case Buffer of +% <<_:Used,0:1,Num:6,_:((8-Used+1) rem 8),Rest/binary>> -> +% {Num, +% case getbit(Buffer) of +% {0,Remain} -> +% {Bits,Remain2} = getbits(Remain,6), +% {Bits+1,Remain2}; +% {1,Remain} -> +% decode_length(Remain,undefined) +% end. + +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 + {0,Buffer2} = align(Buffer), + case Buffer2 of + <<0:1,Oct:7,Rest/binary>> -> + {Oct,{0,Rest}}; + <<2:2,Val:14,Rest/binary>> -> + {Val,{0,Rest}}; + <<3:2,_:14,_Rest/binary>> -> + %% this case should be fixed + exit({error,{asn1,{decode_length,{nyi,above_16k}}}}) + end; +%% {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,_}) when is_integer(Lb), Lb >= 0 -> % Ub > 65535 + decode_length(Buffer,undefined); +decode_length(Buffer,{VR={_Lb,_Ub},Ext}) when is_list(Ext) -> + case getbit(Buffer) of + {0,Buffer2} -> + decode_length(Buffer2, VR); + {1,Buffer2} -> + decode_length(Buffer2, undefined) + end; +%% {0,Buffer2} = getbit(Buffer), +%% decode_length(Buffer2, VR); + + +%When does this case occur with {_,_Lb,Ub} ?? +% X.691:10.9.3.5 +decode_length({Used,Bin},{_,_Lb,_Ub}) -> %when Len =< 127 -> % Unconstrained or large Ub NOTE! this case does not cover case when Ub > 65535 + Unused = (8-Used) rem 8, + case Bin of + <<_:Used,0:1,Val:7,R:Unused,Rest/binary>> -> + {Val,{Used,<<R,Rest/binary>>}}; + <<_:Used,_:Unused,2:2,Val:14,Rest/binary>> -> + {Val, {0,Rest}}; + <<_:Used,_:Unused,3:2,_:14,_Rest/binary>> -> + exit({error,{asn1,{decode_length,{nyi,length_above_64K}}}}) + end; +% 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 is_integer(SingleValue) -> + {SingleValue,Buffer}. + + + % X.691:11 +encode_boolean(true) -> + {bits,1,1}; +encode_boolean(false) -> + {bits,1,0}; +encode_boolean({Name,Val}) when is_atom(Name) -> + encode_boolean(Val); +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. + + +%% ENUMERATED with extension marker +decode_enumerated(Buffer,C,{Ntup1,Ntup2}) when is_tuple(Ntup1), is_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 is_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 is_atom(NewVal) -> {NewVal,Buffer3}; + _ -> {{asn1_enum,Val},Buffer3} + end + end; + +decode_enumerated(Buffer,C,NamedNumberTup) when is_tuple(NamedNumberTup) -> + {Val,Buffer2} = decode_integer(Buffer,C), + case catch (element(Val+1,NamedNumberTup)) of + NewVal when is_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 is_integer(Unused), + is_binary(BinBits) -> + encode_bin_bit_string(C,Bin,NamedBitList); + +%% when the value is a list of named bits +encode_bit_string(C, LoNB=[FirstVal | _RestVal], NamedBitList) when is_atom(FirstVal) -> + ToSetPos = get_all_bitposes(LoNB, NamedBitList, []), + BitList = make_and_set_list(ToSetPos,0), + encode_bit_string(C,BitList,NamedBitList); + +encode_bit_string(C, BL=[{bit,_No} | _RestVal], NamedBitList) -> + ToSetPos = get_all_bitposes(BL, 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 is_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 is_integer(V),V=<16 -> % fixed length 16 bits or less +% pad_list(V,BitList); +% V when is_integer(V) -> % fixed length 16 bits or more +% [align,pad_list(V,BitList)]; % should be another case for V >= 65537 +% {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> +% [encode_length({Lb,Ub},length(BitList)),align,BitList]; +% no -> +% [encode_length(undefined,length(BitList)),align,BitList]; +% Sc -> % extension marker +% [encode_length(Sc,length(BitList)),align,BitList] +% end; +encode_bit_string(C, BitListValue, NamedBitList) when is_list(BitListValue) -> + BitListToBinary = + %% fun that transforms a list of 1 and 0 to a tuple: + %% {UnusedBitsInLastByte, Binary} + fun([1|T],Acc,N,Fun) -> + Fun(T,(Acc bsl 1)+1,N+1,Fun); + ([0|T],Acc,N,Fun) -> + Fun(T,(Acc bsl 1),N+1,Fun); + ([_H|_T],_,_,_) -> + exit({error,{asn1,{bitstring_bitlist,BitListValue}}}); + ([],Acc,N,_) -> + Unused = (8 - (N rem 8)) rem 8, + {Unused,<<Acc:N,0:Unused>>} + end, + UnusedAndBin = + case NamedBitList of + [] -> % dont remove trailing zeroes + BitListToBinary(BitListValue,0,0,BitListToBinary); + _ -> + BitListToBinary(lists:reverse( + lists:dropwhile(fun(0)->true;(_)->false end, + lists:reverse(BitListValue))), + 0,0,BitListToBinary) + end, + encode_bin_bit_string(C,UnusedAndBin,NamedBitList); + +%% when the value is an integer +encode_bit_string(C, IntegerVal, NamedBitList) when is_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 is_atom(Name) -> + encode_bit_string(C,Val,NamedBitList). + + +%% encode_bin_bit_string/3, when value is a tuple of Unused and BinBits. +%% Unused = integer(),i.e. number unused bits in least sign. byte of +%% BinBits = binary(). + + +encode_bin_bit_string(C,UnusedAndBin={_Unused,_BinBits},NamedBitList) -> + Constr = get_constraint(C,'SizeConstraint'), + UnusedAndBin1 = {Unused1,Bin1} = + remove_trailing_bin(NamedBitList,UnusedAndBin,lower_bound(Constr)), + case Constr of + 0 -> + []; + V when is_integer(V),V=<16 -> + {Unused2,Bin2} = pad_list(V,UnusedAndBin1), + <<BitVal:V,_:Unused2>> = Bin2, + {bits,V,BitVal}; + V when is_integer(V) -> + [align, pad_list(V, UnusedAndBin1)]; + {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> + [encode_length({Lb,Ub},size(Bin1)*8 - Unused1), + align,UnusedAndBin1]; + {{Fix,Fix},L} when is_integer(Fix),is_list(L) -> + %% X.691 � 15.6, the rest of this paragraph is covered by + %% the last, ie. Sc, clause in this case + case (size(Bin1)*8)-Unused1 of + Size when Size =< Fix, Fix =< 16 -> + {Unused2,Bin2} = pad_list(Fix,UnusedAndBin), + <<BitVal:Fix,_:Unused2>> = Bin2, + [{bits,1,0},{bits,Fix,BitVal}]; + Size when Size =< Fix -> + [{bits,1,0},align, pad_list(Fix, UnusedAndBin1)]; + Size -> + [{bits,1,1},encode_length(undefined,Size), + align,UnusedAndBin1] + end; + no -> + [encode_length(undefined,size(Bin1)*8 - Unused1), + align,UnusedAndBin1]; + Sc -> + [encode_length(Sc,size(Bin1)*8 - Unused1), + align,UnusedAndBin1] + end. + + +remove_trailing_bin([], {Unused,Bin},_) -> + {Unused,Bin}; +remove_trailing_bin(_NamedNumberList,{_Unused,<<>>},C) -> + case C of + Int when is_integer(Int),Int > 0 -> + %% this padding see OTP-4353 + pad_list(Int,{0,<<>>}); + _ -> {0,<<>>} + end; +remove_trailing_bin(NamedNumberList, {_Unused,Bin},C) -> + Size = size(Bin)-1, + <<Bfront:Size/binary, LastByte:8>> = Bin, + %% clear the Unused bits to be sure + Unused1 = trailingZeroesInNibble(LastByte band 15), + Unused2 = + case Unused1 of + 4 -> + 4 + trailingZeroesInNibble(LastByte bsr 4); + _ -> Unused1 + end, + case Unused2 of + 8 -> + remove_trailing_bin(NamedNumberList,{0,Bfront},C); + _ -> + case C of + Int when is_integer(Int),Int > ((size(Bin)*8)-Unused2) -> + %% this padding see OTP-4353 + pad_list(Int,{Unused2,Bin}); + _ -> {Unused2,Bin} + end + end. + + +trailingZeroesInNibble(0) -> + 4; +trailingZeroesInNibble(1) -> + 0; +trailingZeroesInNibble(2) -> + 1; +trailingZeroesInNibble(3) -> + 0; +trailingZeroesInNibble(4) -> + 2; +trailingZeroesInNibble(5) -> + 0; +trailingZeroesInNibble(6) -> + 1; +trailingZeroesInNibble(7) -> + 0; +trailingZeroesInNibble(8) -> + 3; +trailingZeroesInNibble(9) -> + 0; +trailingZeroesInNibble(10) -> + 1; +trailingZeroesInNibble(11) -> + 0; +trailingZeroesInNibble(12) -> %#1100 + 2; +trailingZeroesInNibble(13) -> + 0; +trailingZeroesInNibble(14) -> + 1; +trailingZeroesInNibble(15) -> + 0. + +lower_bound({{Lb,_},_}) when is_integer(Lb) -> + Lb; +lower_bound({Lb,_}) when is_integer(Lb) -> + Lb; +lower_bound(C) -> + C. + +%%%%%%%%%%%%%%% +%% 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 + {{8,0},Buffer}; + V when is_integer(V),V=<16 -> %fixed length 16 bits or less + compact_bit_string(Buffer,V,NamedNumberList); + V when is_integer(V),V=<65536 -> %fixed length > 16 bits + Bytes2 = align(Buffer), + compact_bit_string(Bytes2,V,NamedNumberList); + V when is_integer(V) -> % V > 65536 => fragmented value + {Bin,Buffer2} = decode_fragmented_bits(Buffer,V), + case Buffer2 of + {0,_} -> {{0,Bin},Buffer2}; + {U,_} -> {{8-U,Bin},Buffer2} + end; + {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> + %% This case may demand decoding of fragmented length/value + {Len,Bytes2} = decode_length(Buffer,{Lb,Ub}), + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + no -> + %% This case may demand decoding of fragmented length/value + {Len,Bytes2} = decode_length(Buffer,undefined), + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + {{Fix,Fix},L} = Sc when is_list(L), is_integer(Fix), Fix =< 16 -> + %% X.691 �15.6, special case of extension marker + case decode_length(Buffer,Sc) of + {Len,Bytes2} when Len > Fix -> + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + {Len,Bytes2} -> + compact_bit_string(Bytes2,Len,NamedNumberList) + end; + 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 + {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> + {Len,Bytes2} = decode_length(Buffer,{Lb,Ub}), + Bytes3 = align(Bytes2), + bit_list_or_named(Bytes3,Len,NamedNumberList); + no -> + {Len,Bytes2} = decode_length(Buffer,undefined), + Bytes3 = align(Bytes2), + bit_list_or_named(Bytes3,Len,NamedNumberList); + 0 -> % fixed length + {[],Buffer}; % nothing to encode + V when is_integer(V),V=<16 -> % fixed length 16 bits or less + bit_list_or_named(Buffer,V,NamedNumberList); + V when is_integer(V),V=<65536 -> + Bytes2 = align(Buffer), + bit_list_or_named(Bytes2,V,NamedNumberList); + V when is_integer(V) -> + Bytes2 = align(Buffer), + {BinBits,_} = decode_fragmented_bits(Bytes2,V), + bit_list_or_named(BinBits,V,NamedNumberList); + {{Fix,Fix},L} = Sc when is_list(L), is_integer(Fix), Fix =< 16 -> + %% X.691 �15.6, special case of extension marker + case decode_length(Buffer,Sc) of + {Len,Bytes2} when Len > Fix -> + Bytes3 = align(Bytes2), + bit_list_or_named(Bytes3,Len,NamedNumberList); + {Len,Bytes2} when Len > 16 -> + Bytes3 = align(Bytes2), + bit_list_or_named(Bytes3,Len,NamedNumberList); + {Len,Bytes2} -> + bit_list_or_named(Bytes2,Len,NamedNumberList) + end; + Sc -> %% X.691 �15.6, extension marker + {Len,Bytes2} = decode_length(Buffer,Sc), + Bytes3 = align(Bytes2), + bit_list_or_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_or_named(Buffer,Len,NamedNumberList). + + +%% if no named bits are declared we will return a +%% BitList = [0 | 1] + +bit_list_or_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_or_named(Buffer,Len,NamedNumberList) -> + {BitList,Rest} = getbits_as_list(Len,Buffer), + {bit_list_or_named1(0,BitList,NamedNumberList,[]), Rest}. + +bit_list_or_named1(Pos,[0|Bt],Names,Acc) -> + bit_list_or_named1(Pos+1,Bt,Names,Acc); +bit_list_or_named1(Pos,[1|Bt],Names,Acc) -> + case lists:keysearch(Pos,2,Names) of + {value,{Name,_}} -> + bit_list_or_named1(Pos+1,Bt,Names,[Name|Acc]); + _ -> + bit_list_or_named1(Pos+1,Bt,Names,[{bit,Pos}|Acc]) + end; +bit_list_or_named1(_,[],_,Acc) -> + lists:reverse(Acc). + + + +%%%%%%%%%%%%%%% +%% + +int_to_bitlist(Int) when is_integer(Int), Int > 0 -> + [Int band 1 | int_to_bitlist(Int bsr 1)]; +int_to_bitlist(0) -> + []. + + +%%%%%%%%%%%%%%%%%% +%% 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([], _) -> + []. + +%%%%%%%%%%%%%%%%% +%% 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(N,In={Unused,Bin}) -> + pad_list(N, size(Bin)*8 - Unused, In). + +pad_list(N,Size,In={_,_}) when N < Size -> + exit({error,{asn1,{range_error,{bit_string,In}}}}); +pad_list(N,Size,{Unused,Bin}) when N > Size, Unused > 0 -> + pad_list(N,Size+1,{Unused-1,Bin}); +pad_list(N,Size,{_Unused,Bin}) when N > Size -> + pad_list(N,Size+1,{7,<<Bin/binary,0>>}); +pad_list(N,N,In={_,_}) -> + In. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% X.691:16 +%% encode_octet_string(Constraint,ExtensionMarker,Val) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +encode_octet_string(C,Val) -> + encode_octet_string2(C,Val). + +encode_octet_string2(C,{_Name,Val}) -> + encode_octet_string2(C,Val); +encode_octet_string2(C,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 + {octets,Val}; + {Lb,Ub} -> + [encode_length({Lb,Ub},length(Val)),{octets,Val}]; + Sv when is_list(Sv) -> + [encode_length({hd(Sv),lists:max(Sv)},length(Val)),{octets,Val}]; + no -> + [encode_length(undefined,length(Val)),{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 -> + {Bs,Bytes2}= getbits(Bytes,16), + {binary_to_list(<<Bs:16>>),Bytes2}; + {_,0} -> + {[],Bytes}; + Sv when is_integer(Sv), Sv =<65535 -> % fixed length + getoctets_as_list(Bytes,Sv); + Sv when is_integer(Sv) -> % fragmented encoding + Bytes2 = align(Bytes), + decode_fragmented_octets(Bytes2,Sv); + {Lb,Ub} -> + {Len,Bytes2} = decode_length(Bytes,{Lb,Ub}), + getoctets_as_list(Bytes2,Len); + Sv when is_list(Sv) -> + {Len,Bytes2} = decode_length(Bytes,{hd(Sv),lists:max(Sv)}), + getoctets_as_list(Bytes2,Len); + no -> + {Len,Bytes2} = decode_length(Bytes,undefined), + getoctets_as_list(Bytes2,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 is_atom(Name) -> + encode_restricted_string(aligned,Val); + +encode_restricted_string(aligned,Val) when is_list(Val)-> + [encode_length(undefined,length(Val)),{octets,Val}]. + +encode_known_multiplier_string(aligned,StringType,C,_Ext,{Name,Val}) when is_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 is_integer(Ub), Ub*NumBits =< 16 -> + Result; + 0 -> + []; + Ub when is_integer(Ub),Ub =<65535 -> % fixed length + [align,Result]; + {Ub,Lb} -> + [encode_length({Ub,Lb},length(Val)),align,Result]; + Vl when is_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), + getoctets_as_list(Bytes2,Len). + +decode_known_multiplier_string(Bytes,aligned,StringType,C,_Ext) -> + NumBits = get_NumBits(C,StringType), + case get_constraint(C,'SizeConstraint') of + Ub when is_integer(Ub), Ub*NumBits =< 16 -> + chars_decode(Bytes,NumBits,StringType,C,Ub); + Ub when is_integer(Ub),Ub =<65535 -> % fixed length + Bytes1 = align(Bytes), + chars_decode(Bytes1,NumBits,StringType,C,Ub); + 0 -> + {[],Bytes}; + Vl when is_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,exit_if_false(H,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,exit_if_false({A,B,C,D},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([],_,_) -> + []. + +exit_if_false(V,false)-> + exit({error,{asn1,{"illegal value according to Permitted alphabet constraint",V}}}); +exit_if_false(_,V) ->V. + + +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 =< 4 -> 4; + B when B =< 8 -> 8; + B when B =< 16 -> 16; + B when 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 is_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 = + if + Char < 256 -> Char; + true -> + list_to_tuple(binary_to_list(<<Char:32>>)) + end, + chars_decode2(Bytes2,{Min,Max,notab},NumBits,Len -1,[Result|Acc]); +% 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]). + + +%% UTF8String +encode_UTF8String(Val) when is_binary(Val) -> + [encode_length(undefined,size(Val)),{octets,Val}]; +encode_UTF8String(Val) -> + Bin = list_to_binary(Val), + encode_UTF8String(Bin). + +decode_UTF8String(Bytes) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + {list_to_binary(Octs),Bytes3}. + + + % X.691:17 +encode_null(_) -> []. % encodes to nothing +%encode_null({Name,Val}) when is_atom(Name) -> +% encode_null(Val). + +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 is_atom(Name) -> + encode_object_identifier(Val); +encode_object_identifier(Val) -> + OctetList = e_object_identifier(Val), + Octets = list_to_binary(OctetList), % performs a flatten at the same time + [{debug,object_identifier},encode_length(undefined,size(Octets)),{octets,Octets}]. + +%% This code is copied from asn1_encode.erl (BER) and corrected and modified + +e_object_identifier({'OBJECT IDENTIFIER',V}) -> + e_object_identifier(V); +e_object_identifier({Cname,V}) when is_atom(Cname),is_tuple(V) -> + e_object_identifier(tuple_to_list(V)); +e_object_identifier({Cname,V}) when is_atom(Cname),is_list(V) -> + e_object_identifier(V); +e_object_identifier(V) when is_tuple(V) -> + e_object_identifier(tuple_to_list(V)); + +%% E1 = 0|1|2 and (E2 < 40 when E1 = 0|1) +e_object_identifier([E1,E2|Tail]) when E1 >= 0, E1 < 2, E2 < 40 ; E1==2 -> + Head = 40*E1 + E2, % weird + e_object_elements([Head|Tail],[]); +e_object_identifier(Oid=[_,_|_Tail]) -> + exit({error,{asn1,{'illegal_value',Oid}}}). + +e_object_elements([],Acc) -> + lists:reverse(Acc); +e_object_elements([H|T],Acc) -> + e_object_elements(T,[e_object_element(H)|Acc]). + +e_object_element(Num) when Num < 128 -> + [Num]; +e_object_element(Num) -> + [e_o_e(Num bsr 7)|[Num band 2#1111111]]. +e_o_e(Num) when Num < 128 -> + Num bor 2#10000000; +e_o_e(Num) -> + [e_o_e(Num bsr 7)|[(Num band 2#1111111) bor 2#10000000]]. + + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_relative_oid(Val) -> CompleteList +%% encode_relative_oid({Name,Val}) -> CompleteList +encode_relative_oid({Name,Val}) when is_atom(Name) -> + encode_relative_oid(Val); +encode_relative_oid(Val) when is_tuple(Val) -> + encode_relative_oid(tuple_to_list(Val)); +encode_relative_oid(Val) when is_list(Val) -> + Octets = list_to_binary([e_object_element(X)||X <- Val]), + [encode_length(undefined,size(Octets)),{octets,Octets}]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_relative_oid(Val) -> {ROID,Rest} +%% decode_relative_oid({Name,Val}) -> {ROID,Rest} +decode_relative_oid(Bytes) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), + ObjVals = dec_subidentifiers(Octs,0,[]), + {list_to_tuple(ObjVals),Bytes3}. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_real(Val) -> CompleteList +%% encode_real({Name,Val}) -> CompleteList +encode_real({Name,Val}) when is_atom(Name) -> + encode_real(Val); +encode_real(Real) -> + {EncVal,Len} = ?RT_COMMON:encode_real([],Real), + [encode_length(undefined,Len),{octets,EncVal}]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_real(Val) -> {REALvalue,Rest} +%% decode_real({Name,Val}) -> {REALvalue,Rest} +decode_real(Bytes) -> + {Len,{0,Bytes2}} = decode_length(Bytes,undefined), + {RealVal,Rest,Len} = ?RT_COMMON:decode_real(Bytes2,Len), + {RealVal,{0,Rest}}. + + +get_constraint([{Key,V}],Key) -> + V; +get_constraint([],_Key) -> + no; +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(L) -> +% case complete1(L) of +% {[],0} -> +% <<0>>; +% {Acc,0} -> +% lists:reverse(Acc); +% {[Hacc|Tacc],Acclen} -> % Acclen >0 +% Rest = 8 - Acclen, +% NewHacc = Hacc bsl Rest, +% lists:reverse([NewHacc|Tacc]) +% end. + + +% complete1(InList) when is_list(InList) -> +% complete1(InList,[]); +% complete1(InList) -> +% complete1([InList],[]). + +% complete1([{debug,_}|T], Acc) -> +% complete1(T,Acc); +% complete1([H|T],Acc) when is_list(H) -> +% {NewH,NewAcclen} = complete1(H,Acc), +% complete1(T,NewH,NewAcclen); + +% complete1([{0,Bin}|T],Acc,0) when is_binary(Bin) -> +% complete1(T,[Bin|Acc],0); +% complete1([{Unused,Bin}|T],Acc,0) when is_integer(Unused),is_binary(Bin) -> +% Size = size(Bin)-1, +% <<Bs:Size/binary,B>> = Bin, +% complete1(T,[(B bsr Unused),Bs|Acc],8-Unused); +% complete1([{Unused,Bin}|T],[Hacc|Tacc],Acclen) when is_integer(Unused),is_binary(Bin) -> +% Rest = 8 - Acclen, +% Used = 8 - Unused, +% case size(Bin) of +% 1 -> +% if +% Rest >= Used -> +% <<B:Used,_:Unused>> = Bin, +% complete1(T,[(Hacc bsl Used) + B|Tacc], +% (Acclen+Used) rem 8); +% true -> +% LeftOver = 8 - Rest - Unused, +% <<Val2:Rest,Val1:LeftOver,_:Unused>> = Bin, +% complete1(T,[Val1,(Hacc bsl Rest) + Val2|Tacc], +% (Acclen+Used) rem 8) +% end; +% N -> +% if +% Rest == Used -> +% N1 = N - 1, +% <<B:Rest,Bs:N1/binary,_:Unused>> = Bin, +% complete1(T,[Bs,(Hacc bsl Rest) + B|Tacc],0); +% Rest > Used -> +% N1 = N - 2, +% N2 = (8 - Rest) + Used, +% <<B1:Rest,Bytes:N1/binary,B2:N2,_:Unused>> = Bin, +% complete1(T,[B2,Bytes,(Hacc bsl Rest) + B1|Tacc], +% (Acclen + Used) rem 8); +% true -> % Rest < Used +% N1 = N - 1, +% N2 = Used - Rest, +% <<B1:Rest,Bytes:N1/binary,B2:N2,_:Unused>> = Bin, +% complete1(T,[B2,Bytes,(Hacc bsl Rest) + B1|Tacc], +% (Acclen + Used) rem 8) +% end +% end; + +% %complete1([{octets,N,Val}|T],Acc,Acclen) when N =< 4 ,is_integer(Val) -> +% % complete1([{octets,<<Val:N/unit:8>>}|T],Acc,Acclen); +% complete1([{octets,N,Val}|T],Acc,Acclen) when N =< 4 ,is_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, +% complete1([{octets,Newval}|T],Acc,Acclen); + +% complete1([{octets,Bin}|T],Acc,Acclen) when is_binary(Bin) -> +% Rest = 8 - Acclen, +% if +% Rest == 8 -> +% complete1(T,[Bin|Acc],0); +% true -> +% [Hacc|Tacc]=Acc, +% complete1(T,[Bin, Hacc bsl Rest|Tacc],0) +% end; + +% complete1([{octets,Oct}|T],Acc,Acclen) when is_list(Oct) -> +% Rest = 8 - Acclen, +% if +% Rest == 8 -> +% complete1(T,[list_to_binary(Oct)|Acc],0); +% true -> +% [Hacc|Tacc]=Acc, +% complete1(T,[list_to_binary(Oct), Hacc bsl Rest|Tacc],0) +% end; + +% complete1([{bit,Val}|T], Acc, Acclen) -> +% complete1([{bits,1,Val}|T],Acc,Acclen); +% complete1([{octet,Val}|T], Acc, Acclen) -> +% complete1([{octets,1,Val}|T],Acc,Acclen); + +% complete1([{bits,N,Val}|T], Acc, 0) when N =< 8 -> +% complete1(T,[Val|Acc],N); +% complete1([{bits,N,Val}|T], [Hacc|Tacc], Acclen) when N =< 8 -> +% Rest = 8 - Acclen, +% if +% Rest >= N -> +% complete1(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}), +% complete1(T,[(Val band Mask),NewHacc|Tacc],(Acclen+N) rem 8) +% end; +% complete1([{bits,N,Val}|T], Acc, Acclen) -> % N > 8 +% complete1([{bits,N-8,Val bsr 8},{bits,8,Val band 255}|T],Acc,Acclen); + +% complete1([align|T],Acc,0) -> +% complete1(T,Acc,0); +% complete1([align|T],[Hacc|Tacc],Acclen) -> +% Rest = 8 - Acclen, +% complete1(T,[Hacc bsl Rest|Tacc],0); +% complete1([{octets,N,Val}|T],Acc,Acclen) when is_list(Val) -> % no security check here +% complete1([{octets,Val}|T],Acc,Acclen); + +% complete1([],Acc,Acclen) -> +% {Acc,Acclen}. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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(L) -> + case complete1(L) of + {[],[]} -> + <<0>>; + {Acc,[]} -> + Acc; + {Acc,Bacc} -> + [Acc|complete_bytes(Bacc)] + end. + +%% this function builds the ugly form of lists [E1|E2] to avoid having to reverse it at the end. +%% this is done because it is efficient and that the result always will be sent on a port or +%% converted by means of list_to_binary/1 +complete1(InList) when is_list(InList) -> + complete1(InList,[],[]); +complete1(InList) -> + complete1([InList],[],[]). + +complete1([],Acc,Bacc) -> + {Acc,Bacc}; +complete1([H|T],Acc,Bacc) when is_list(H) -> + {NewH,NewBacc} = complete1(H,Acc,Bacc), + complete1(T,NewH,NewBacc); + +complete1([{octets,Bin}|T],Acc,[]) -> + complete1(T,[Acc|Bin],[]); + +complete1([{octets,Bin}|T],Acc,Bacc) -> + complete1(T,[Acc|[complete_bytes(Bacc),Bin]],[]); + +complete1([{debug,_}|T], Acc,Bacc) -> + complete1(T,Acc,Bacc); + +complete1([{bits,N,Val}|T],Acc,Bacc) -> + complete1(T,Acc,complete_update_byte(Bacc,Val,N)); + +complete1([{bit,Val}|T],Acc,Bacc) -> + complete1(T,Acc,complete_update_byte(Bacc,Val,1)); + +complete1([align|T],Acc,[]) -> + complete1(T,Acc,[]); +complete1([align|T],Acc,Bacc) -> + complete1(T,[Acc|complete_bytes(Bacc)],[]); +complete1([{0,Bin}|T],Acc,[]) when is_binary(Bin) -> + complete1(T,[Acc|Bin],[]); +complete1([{Unused,Bin}|T],Acc,[]) when is_integer(Unused),is_binary(Bin) -> + Size = size(Bin)-1, + <<Bs:Size/binary,B>> = Bin, + NumBits = 8-Unused, + complete1(T,[Acc|Bs],[[B bsr Unused]|NumBits]); +complete1([{Unused,Bin}|T],Acc,Bacc) when is_integer(Unused),is_binary(Bin) -> + Size = size(Bin)-1, + <<Bs:Size/binary,B>> = Bin, + NumBits = 8 - Unused, + Bf = complete_bytes(Bacc), + complete1(T,[Acc|[Bf,Bs]],[[B bsr Unused]|NumBits]). + + +complete_update_byte([],Val,Len) -> + complete_update_byte([[0]|0],Val,Len); +complete_update_byte([[Byte|Bacc]|NumBits],Val,Len) when NumBits + Len == 8 -> + [[0,((Byte bsl Len) + Val) band 255|Bacc]|0]; +complete_update_byte([[Byte|Bacc]|NumBits],Val,Len) when NumBits + Len > 8 -> + Rem = 8 - NumBits, + Rest = Len - Rem, + complete_update_byte([[0,((Byte bsl Rem) + (Val bsr Rest)) band 255 |Bacc]|0],Val,Rest); +complete_update_byte([[Byte|Bacc]|NumBits],Val,Len) -> + [[((Byte bsl Len) + Val) band 255|Bacc]|NumBits+Len]. + + +complete_bytes([[_Byte|Bacc]|0]) -> + lists:reverse(Bacc); +complete_bytes([[Byte|Bacc]|NumBytes]) -> + lists:reverse([(Byte bsl (8-NumBytes)) band 255|Bacc]); +complete_bytes([]) -> + []. + +% complete_bytes(L) -> +% complete_bytes1(lists:reverse(L),[],[],0,0). + +% complete_bytes1([H={V,B}|T],Acc,ReplyAcc,NumBits,NumFields) when ((NumBits+B) rem 8) == 0 -> +% NewReplyAcc = [complete_bytes2([H|Acc],0)|ReplyAcc], +% complete_bytes1(T,[],NewReplyAcc,0,0); +% complete_bytes1([H={V,B}|T],Acc,ReplyAcc,NumBits,NumFields) when NumFields == 7; (NumBits+B) div 8 > 0 -> +% Rem = (NumBits+B) rem 8, +% NewReplyAcc = [complete_bytes2([{V bsr Rem,B - Rem}|Acc],0)|ReplyAcc], +% complete_bytes1([{V,Rem}|T],[],NewReplyAcc,0,0); +% complete_bytes1([H={V,B}|T],Acc,ReplyAcc,NumBits,NumFields) -> +% complete_bytes1(T,[H|Acc],ReplyAcc,NumBits+B,NumFields+1); +% complete_bytes1([],[],ReplyAcc,_,_) -> +% lists:reverse(ReplyAcc); +% complete_bytes1([],Acc,ReplyAcc,NumBits,_) -> +% PadBits = case NumBits rem 8 of +% 0 -> 0; +% Rem -> 8 - Rem +% end, +% lists:reverse([complete_bytes2(Acc,PadBits)|ReplyAcc]). + + +% complete_bytes2([{V1,B1}],PadBits) -> +% <<V1:B1,0:PadBits>>; +% complete_bytes2([{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,0:PadBits>>; +% complete_bytes2([{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,0:PadBits>>; +% complete_bytes2([{V4,B4},{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,V4:B4,0:PadBits>>; +% complete_bytes2([{V5,B5},{V4,B4},{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,V4:B4,V5:B5,0:PadBits>>; +% complete_bytes2([{V6,B6},{V5,B5},{V4,B4},{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,V4:B4,V5:B5,V6:B6,0:PadBits>>; +% complete_bytes2([{V7,B7},{V6,B6},{V5,B5},{V4,B4},{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,V4:B4,V5:B5,V6:B6,V7:B7,0:PadBits>>; +% complete_bytes2([{V8,B8},{V7,B7},{V6,B6},{V5,B5},{V4,B4},{V3,B3},{V2,B2},{V1,B1}],PadBits) -> +% <<V1:B1,V2:B2,V3:B3,V4:B4,V5:B5,V6:B6,V7:B7,V8:B8,0:PadBits>>. + + + + + + |