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Diffstat (limited to 'lib/asn1/src/asn1rtt_uper.erl')
| -rw-r--r-- | lib/asn1/src/asn1rtt_uper.erl | 1379 |
1 files changed, 1379 insertions, 0 deletions
diff --git a/lib/asn1/src/asn1rtt_uper.erl b/lib/asn1/src/asn1rtt_uper.erl new file mode 100644 index 0000000000..bcc11da63a --- /dev/null +++ b/lib/asn1/src/asn1rtt_uper.erl @@ -0,0 +1,1379 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2012. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% +%% +%% +-module(asn1rtt_uper). + +-export([setext/1, fixoptionals/3, + fixextensions/2, + skipextensions/3, getbit/1, getchoice/3 ]). +-export([set_choice/3, encode_integer/2, encode_integer/3]). +-export([encode_small_number/1, encode_boolean/1, + encode_length/1, encode_length/2, + decode_compact_bit_string/3]). +-export([encode_bit_string/3, decode_bit_string/3]). +-export([encode_octet_string/2, + encode_relative_oid/1, decode_relative_oid/1, + encode_object_identifier/1, decode_object_identifier/1, + complete/1, complete_NFP/1]). + + -export([encode_open_type/1]). + + -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 + ]). + +-define('16K',16384). +-define('32K',32768). +-define('64K',65536). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% setext(true|false) -> CompleteList +%% + +setext(false) -> + <<0:1>>; +setext(true) -> + <<1:1>>. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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>>}; + +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. + + +fixextensions({ext,ExtPos,ExtNum},Val) -> + case fixextensions(ExtPos,ExtNum+ExtPos,Val,0) of + 0 -> []; + ExtBits -> + [encode_small_length(ExtNum),<<ExtBits:ExtNum>>] + 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(Bytes0, Nr, ExtensionBitstr) when is_bitstring(ExtensionBitstr) -> + Prev = Nr - 1, + case ExtensionBitstr of + <<_:Prev,1:1,_/bitstring>> -> + {Len,Bytes1} = decode_length(Bytes0, undefined), + <<_:Len/binary,Bytes2/bitstring>> = Bytes1, + skipextensions(Bytes2, Nr+1, ExtensionBitstr); + <<_:Prev,0:1,_/bitstring>> -> + skipextensions(Bytes0, Nr+1, ExtensionBitstr); + _ -> + Bytes0 + 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}). + + +%% 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_bitstring(Bytes) -> + <<BS:Num/bitstring,Rest/bitstring>> = Bytes, + {BS,Rest}. + +getbits_as_list(Num, Bytes) when is_bitstring(Bytes) -> + <<BitStr:Num/bitstring,Rest/bitstring>> = Bytes, + {[B || <<B:1>> <= BitStr],Rest}. + +getbit(Buffer) -> + <<B:1,Rest/bitstring>> = Buffer, + {B,Rest}. + +getbits(Buffer, Num) when is_bitstring(Buffer) -> + <<Bs:Num,Rest/bitstring>> = Buffer, + {Bs,Rest}. + + +%% Pick the first Num octets. +%% Returns octets as an integer with bit significance as in buffer. +getoctets(Buffer, Num) when is_bitstring(Buffer) -> + <<Val:Num/integer-unit:8,RestBitStr/bitstring>> = Buffer, + {Val,RestBitStr}. + +%% Pick the first Num octets. +%% Returns octets as a binary +getoctets_as_bin(Bin,Num) when is_bitstring(Bin) -> + <<Octets:Num/binary,RestBin/bitstring>> = Bin, + {Octets,RestBin}. + +%% 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 -> + [<<0:1>>, % the value is in the root set + encode_integer([{'ValueRange',{0,Len1-1}}],N)]; + N when is_integer(N) -> + <<0:1>>; % no encoding if only 0 or 1 alternative + false -> + [<<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(Buffer,C) -> + decode_fragmented_bits(Buffer,C,[]). +decode_fragmented_bits(<<3:2,Len:6,BitStr/bitstring>>,C,Acc) -> + FragLen = (Len*?'16K') div 8, + <<Value:FragLen/binary,BitStr2/bitstring>> = BitStr, + decode_fragmented_bits(BitStr2,C,[Value|Acc]); +decode_fragmented_bits(<<0:1,0:7,BitStr/bitstring>>,C,Acc) -> + BinBits = list_to_binary(lists:reverse(Acc)), + case C of + Int when is_integer(Int),C =:= byte_size(BinBits) -> + {BinBits,BitStr}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,BinBits}}}) + end; +decode_fragmented_bits(<<0:1,Len:7,BitStr/bitstring>>,C,Acc) -> + <<Val:Len/bitstring,Rest/bitstring>> = BitStr, + ResBitStr = list_to_bitstring(lists:reverse([Val|Acc])), + case C of + Int when is_integer(Int),C == bit_size(ResBitStr) -> + {ResBitStr,Rest}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,ResBitStr}}}) + 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(Val) when is_list(Val) -> + encode_open_type(list_to_binary(Val)); +encode_open_type(Val) when is_binary(Val) -> + [encode_length(byte_size(Val)),Val]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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:keyfind(V, 1, NamedNumberList) of + {_,NewV} -> + encode_integer(C, NewV); + false -> + exit({error,{asn1,{namednumber,V}}}) + end; +encode_integer(C, V, _NamedNumberList) when is_integer(V) -> + encode_integer(C, V). + +encode_integer([{Rc,_Ec}],Val) when is_tuple(Rc) -> + try + [<<0:1>>,encode_integer([Rc], Val)] + catch + _:{error,{asn1,_}} -> + [<<1:1>>,encode_unconstrained_number(Val)] + 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. + +%% 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(Val) when Val < 64 -> + <<Val:7>>; +encode_small_number(Val) -> + [<<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) + end. + +%% X.691:10.7 Encoding of a semi-constrained whole number +encode_semi_constrained_number(Lb, Val) -> + %% encoding in minimum number of octets preceeded by a length + Val2 = Val - Lb, + Bin = eint_bin_positive(Val2), + Size = byte_size(Bin), + if + Size < 128 -> + [<<Size>>,Bin]; + Size < 16384 -> + [<<2:2,Size:14>>,Bin]; + true -> + [encode_length(Size),Bin] + end. + +decode_semi_constrained_number(Bytes) -> + {Len,Bytes2} = decode_length(Bytes, undefined), + {V,Bytes3} = getoctets(Bytes2,Len), + {V,Bytes3}. + +encode_constrained_number({Lb,Ub}, Val) when Val >= Lb, Ub >= Val -> + Range = Ub - Lb + 1, + Val2 = Val - Lb, + NumBits = num_bits(Range), + <<Val2:NumBits>>; +encode_constrained_number(Range,Val) -> + exit({error,{asn1,{integer_range,Range,value,Val}}}). + + +decode_constrained_number(Buffer, {Lb,Ub}) -> + Range = Ub - Lb + 1, + NumBits = num_bits(Range), + {Val,Remain} = getbits(Buffer,NumBits), + {Val+Lb,Remain}. + +%% X.691:10.8 Encoding of an unconstrained whole number + +encode_unconstrained_number(Val) when Val >= 0 -> + Oct = eint_bin_2Cs(Val), + Len = byte_size(Oct), + if + Len < 128 -> + [<<Len>>,Oct]; % equiv with encode_length(undefined,Len) but faster + Len < 16384 -> + [<<2:2,Len:14>>,Oct]; + true -> + [encode_length(Len),<<Len:16>>,Oct] + end; +encode_unconstrained_number(Val) -> % negative + Oct = enint(Val,[]), + Len = byte_size(Oct), + if + Len < 128 -> + [<<Len>>,Oct]; % equiv with encode_length(undefined,Len) but faster + Len < 16384 -> + [<<2:2,Len:14>>,Oct]; + true -> + [encode_length(Len),Oct] + end. + + +eint_bin_2Cs(Int) -> + case eint_bin_positive(Int) of + <<B,_/binary>> = Bin when B > 16#7f -> + <<0,Bin/binary>>; + Bin -> Bin + end. + +%% returns the integer as a binary +eint_bin_positive(Val) when Val < 16#100 -> + <<Val>>; +eint_bin_positive(Val) when Val < 16#10000 -> + <<Val:16>>; +eint_bin_positive(Val) when Val < 16#1000000 -> + <<Val:24>>; +eint_bin_positive(Val) when Val < 16#100000000 -> + <<Val:32>>; +eint_bin_positive(Val) -> + list_to_binary([eint_bin_positive2(Val bsr 32),<<Val:32>>]). + +eint_bin_positive2(Val) when Val < 16#100 -> + <<Val>>; +eint_bin_positive2(Val) when Val < 16#10000 -> + <<Val:16>>; +eint_bin_positive2(Val) when Val < 16#1000000 -> + <<Val:24>>; +eint_bin_positive2(Val) when Val < 16#100000000 -> + <<Val:32>>; +eint_bin_positive2(Val) -> + [eint_bin_positive2(Val bsr 32),<<Val:32>>]. + + + + +enint(-1, [B1|T]) when B1 > 127 -> + list_to_binary([B1|T]); +enint(N, Acc) -> + enint(N bsr 8, [N band 16#ff|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(Len) -> % un-constrained + if + Len < 128 -> + <<Len>>; + Len < 16384 -> + <<2:2,Len:14>>; + true -> % should be able to endode length >= 16384 + error({error,{asn1,{encode_length,{nyi,above_16k}}}}) + end. + +encode_length(undefined, Len) -> % unconstrained + encode_length(Len); +encode_length({0,'MAX'},Len) -> + encode_length(undefined, Len); +encode_length({Lb,Ub}=Vr, 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(Len); +encode_length({{Lb,Ub}=Vr,Ext},Len) + when Ub =< 65535, Lb >= 0, Len =< Ub, is_list(Ext) -> + %% constrained extensible + [<<0:1>>,encode_constrained_number(Vr,Len)]; +encode_length({{Lb,_Ub},Ext}, Len) when is_list(Ext) -> + [<<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 -> + <<(Len-1):7>>; +encode_small_length(Len) -> + [<<1:1>>,encode_length(Len)]. + + +%% un-constrained +decode_length(<<0:1,Oct:7,Rest/bitstring>>,undefined) -> + {Oct,Rest}; +decode_length(<<2:2,Val:14,Rest/bitstring>>,undefined) -> + {Val,Rest}; +decode_length(<<3:2,_:14,_Rest/bitstring>>,undefined) -> + exit({error,{asn1,{decode_length,{nyi,above_16k}}}}); + +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) -> + {0,Buffer2} = getbit(Buffer), + decode_length(Buffer2, VR); + + +%When does this case occur with {_,_Lb,Ub} ?? +% X.691:10.9.3.5 +decode_length(Bin,{_,_Lb,_Ub}) -> %when Len =< 127 -> % Unconstrained or large Ub NOTE! this case does not cover case when Ub > 65535 + case Bin of + <<0:1,Val:7,Rest/bitstring>> -> + {Val,Rest}; + <<2:2,Val:14,Rest/bitstring>> -> + {Val,Rest}; + <<3:2,_:14,_Rest/bitstring>> -> + exit({error,{asn1,{decode_length,{nyi,length_above_64K}}}}) + end; +decode_length(Buffer,SingleValue) when is_integer(SingleValue) -> + {SingleValue,Buffer}. + + + % X.691:11 +encode_boolean(true) -> + <<1:1>>; +encode_boolean(false) -> + <<0:1>>; +encode_boolean(Val) -> + exit({error,{asn1,{encode_boolean,Val}}}). + + +%%============================================================================ +%%============================================================================ +%% 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 are present + + +%% when the value is a list of {Unused,BinBits}, where +%% Unused = integer(), +%% BinBits = binary(). + +encode_bit_string(C, {Unused,BinBits}=Bin, NamedBitList) + when is_integer(Unused), is_binary(BinBits) -> + encode_bin_bit_string(get_constraint(C,'SizeConstraint'),Bin,NamedBitList); + +encode_bit_string(C, BitListVal, NamedBitList) -> + encode_bit_string1(get_constraint(C, 'SizeConstraint'), BitListVal, NamedBitList). + +%% when the value is a list of named bits +encode_bit_string1(C, [FirstVal|_RestVal]=LoNB, NamedBitList) + when is_atom(FirstVal) -> + ToSetPos = get_all_bitposes(LoNB, NamedBitList, []), + BitList = make_and_set_list(ToSetPos, 0), + encode_bit_string1(C, BitList, NamedBitList); +encode_bit_string1(C, [{bit,_No}|_RestVal]=BL, NamedBitList) -> + ToSetPos = get_all_bitposes(BL, NamedBitList, []), + BitList = make_and_set_list(ToSetPos, 0), + encode_bit_string1(C, BitList, NamedBitList); +%% when the value is a list of ones and zeroes +encode_bit_string1(Int, BitListValue, _) + when is_list(BitListValue), is_integer(Int) -> + %% The type is constrained by a single value size constraint + bit_list2bitstr(Int, BitListValue); +encode_bit_string1(no, BitListValue, []) + when is_list(BitListValue) -> + Len = length(BitListValue), + [encode_length(Len),bit_list2bitstr(Len,BitListValue)]; +encode_bit_string1(C, BitListValue,[]) + when is_list(BitListValue) -> + Len = length(BitListValue), + [encode_length(C, Len),bit_list2bitstr(Len,BitListValue)]; +encode_bit_string1(no, BitListValue,_NamedBitList) + when is_list(BitListValue) -> + NewBitLVal = lists:reverse(lists:dropwhile(fun(0)->true;(1)->false end, + lists:reverse(BitListValue))), + Len = length(NewBitLVal), + [encode_length(Len),bit_list2bitstr(Len,NewBitLVal)]; +encode_bit_string1(C, BitListValue, _NamedBitList) + when is_list(BitListValue) ->% C = {_,'MAX'} + NewBitStr = bitstr_trailing_zeros(BitListValue, C), + [encode_length(C, bit_size(NewBitStr)),NewBitStr]; + + +%% when the value is an integer +encode_bit_string1(C, IntegerVal, NamedBitList) when is_integer(IntegerVal)-> + BitList = int_to_bitlist(IntegerVal), + encode_bit_string1(C, BitList, NamedBitList). + +bit_list2bitstr(Len,BitListValue) -> + case length(BitListValue) of + Len -> + << <<B:1>> || B <- BitListValue>>; + L when L > Len -> % truncate + <<(<< <<B:1>> || B <- BitListValue>>):Len/bitstring>>; + L -> % Len > L -> pad + <<(<< <<B:1>> || B <- BitListValue>>)/bitstring,0:(Len-L)>> + end. + +adjust_trailing_zeros(Len, Bin) when Len =:= bit_size(Bin) -> + Bin; +adjust_trailing_zeros(Len, Bin) when Len > bit_size(Bin) -> + <<Bin/bitstring,0:(Len-bit_size(Bin))>>; +adjust_trailing_zeros(Len,Bin) -> + <<Bin:Len/bitstring>>. + +bitstr_trailing_zeros(BitList, C) when is_integer(C) -> + bitstr_trailing_zeros1(BitList, C, C); +bitstr_trailing_zeros(BitList, {Lb,Ub}) when is_integer(Lb) -> + bitstr_trailing_zeros1(BitList,Lb,Ub); +bitstr_trailing_zeros(BitList, {{Lb,Ub},_}) when is_integer(Lb) -> + bitstr_trailing_zeros1(BitList, Lb, Ub); +bitstr_trailing_zeros(BitList, _) -> + bit_list2bitstr(length(BitList), BitList). + +bitstr_trailing_zeros1(BitList, Lb, Ub) -> + case length(BitList) of + Lb -> bit_list2bitstr(Lb, BitList); + B when B < Lb -> bit_list2bitstr(Lb, BitList); + D -> F = fun(L,LB,LB,_,_)->bit_list2bitstr(LB,lists:reverse(L)); + ([0|R],L1,LB,UB,Fun)->Fun(R,L1-1,LB,UB,Fun); + (L,L1,_,UB,_)when L1 =< UB -> + bit_list2bitstr(L1,lists:reverse(L)); + (_,_L1,_,_,_) ->exit({error,{list_length_BIT_STRING, + BitList}}) end, + F(lists:reverse(BitList),D,Lb,Ub,F) + end. + +%% 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, {_,BinBits}, _NamedBitList) + when is_integer(C), C =< 16 -> + adjust_trailing_zeros(C, BinBits); +encode_bin_bit_string(C, {_Unused,BinBits}, _NamedBitList) + when is_integer(C) -> + adjust_trailing_zeros(C, BinBits); +encode_bin_bit_string(C, {_,_}=UnusedAndBin, NamedBitList) -> + %% removes all trailing bits if NamedBitList is not empty + BitStr = remove_trailing_bin(NamedBitList, UnusedAndBin), + case C of + {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> + [encode_length({Lb,Ub},bit_size(BitStr)),BitStr]; + no -> + [encode_length(bit_size(BitStr)),BitStr]; + Sc -> + [encode_length(Sc,bit_size(BitStr)),BitStr] + end. + + +remove_trailing_bin([], {Unused,Bin}) -> + BS = bit_size(Bin)-Unused, + <<BitStr:BS/bitstring,_:Unused>> = Bin, + BitStr; +remove_trailing_bin(_NamedNumberList, {_Unused,<<>>}) -> + <<>>; +remove_trailing_bin(NamedNumberList, {_Unused,Bin}) -> + Size = byte_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}); + _ -> + BS = bit_size(Bin) - Unused2, + <<BitStr:BS/bitstring,_:Unused2>> = Bin, + BitStr + 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. + +%%%%%%%%%%%%%%% +%% 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 + compact_bit_string(Buffer,V,NamedNumberList); + V when is_integer(V) -> % V > 65536 => fragmented value + {Bin,Buffer2} = decode_fragmented_bits(Buffer,V), + PadLen = (8 - (bit_size(Bin) rem 8)) rem 8, + {{PadLen,<<Bin/bitstring,0:PadLen>>},Buffer2}; + {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}), + compact_bit_string(Bytes2,Len,NamedNumberList); + no -> + %% This case may demand decoding of fragmented length/value + {Len,Bytes2} = decode_length(Buffer,undefined), + compact_bit_string(Bytes2,Len,NamedNumberList); + Sc -> + {Len,Bytes2} = decode_length(Buffer,Sc), + compact_bit_string(Bytes2,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}), + bit_list_or_named(Bytes2,Len,NamedNumberList); + no -> + {Len,Bytes2} = decode_length(Buffer,undefined), + bit_list_or_named(Bytes2,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 -> + bit_list_or_named(Buffer,V,NamedNumberList); + V when is_integer(V) -> + {BinBits,_} = decode_fragmented_bits(Buffer,V), + bit_list_or_named(BinBits,V,NamedNumberList); + Sc -> % extension marker + {Len,Bytes2} = decode_length(Buffer,Sc), + bit_list_or_named(Bytes2,Len,NamedNumberList) + end. + + +%% if no named bits are declared we will return a +%% {Unused,Bits}. Unused = integer(), +%% Bits = binary(). +compact_bit_string(Buffer, Len, []) -> + {BitStr,Rest} = getbits_as_binary(Len,Buffer), % {{Unused,BinBits},NewBuffer} + PadLen = (8 - (bit_size(BitStr) rem 8)) rem 8, + {{PadLen,<<BitStr/bitstring,0:PadLen>>},Rest}; +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:keyfind(Pos, 2, Names) of + {Name,_} -> + bit_list_or_named1(Pos+1,Bt,Names,[Name|Acc]); + false -> + 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:keyfind(Val, 1, NamedBitList) of + {_ValName, ValPos} -> + get_all_bitposes(Rest, NamedBitList, [ValPos | Ack]); + false -> + 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([], _) -> + []. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% X.691:16 +%% encode_octet_string(Constraint,Val) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +encode_octet_string(C,Val) -> + case get_constraint(C,'SizeConstraint') of + 0 -> + <<>>; + 1 -> + list_to_binary(Val); + 2 -> + list_to_binary(Val); + {_,_}=VR -> + try + [encode_length(VR, length(Val)),list_to_binary(Val)] + catch + error:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end; + Sv when is_integer(Sv), Sv =:= length(Val) -> % fixed length + if + Sv =< 65535 -> + list_to_binary(Val); + true -> + encode_fragmented_octet_string(Val) + end; + Sv when is_list(Sv) -> + try + [encode_length({hd(Sv),lists:max(Sv)}, + length(Val)),list_to_binary(Val)] + catch + error:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end; + no -> + try + [encode_length(length(Val)),list_to_binary(Val)] + catch + error:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end + end. + +encode_fragmented_octet_string(Val) -> + Bin = list_to_binary(Val), + efos_1(Bin). + +efos_1(<<B:16#10000/binary,T/binary>>) -> + [<<3:2,4:6>>,B|efos_1(T)]; +efos_1(<<B:16#C000/binary,T/binary>>) -> + [<<3:2,3:6>>,B|efos_1(T)]; +efos_1(<<B:16#8000/binary,T/binary>>) -> + [<<3:2,2:6>>,B|efos_1(T)]; +efos_1(<<B:16#4000/binary,T/binary>>) -> + [<<3:2,1:6>>,B|efos_1(T)]; +efos_1(<<B/bitstring>>) -> + Len = byte_size(B), + [encode_length(Len),B]. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Restricted char string types +%% (NumericString, PrintableString,VisibleString,IA5String,BMPString,UniversalString) +%% X.691:26 and X.680:34-36 +%%encode_restricted_string('BMPString',Constraints,Extension,Val) + + +encode_restricted_string(Val) when is_list(Val)-> + [encode_length(length(Val)),list_to_binary(Val)]. + +encode_known_multiplier_string(StringType, C, 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 + Result; + {Ub,Lb} -> + [encode_length({Ub,Lb}, length(Val)),Result]; + Vl when is_list(Vl) -> + [encode_length({lists:min(Vl),lists:max(Vl)}, length(Val)),Result]; + no -> + [encode_length(length(Val)),Result] + end. + +decode_restricted_string(Bytes) -> + {Len,Bytes2} = decode_length(Bytes, undefined), + getoctets_as_list(Bytes2,Len). + +decode_known_multiplier_string(Bytes, 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 + chars_decode(Bytes,NumBits,StringType,C,Ub); + 0 -> + {[],Bytes}; + Vl when is_list(Vl) -> + {Len,Bytes1} = decode_length(Bytes,{hd(Vl),lists:max(Vl)}), + chars_decode(Bytes1,NumBits,StringType,C,Len); + no -> + {Len,Bytes1} = decode_length(Bytes,undefined), + chars_decode(Bytes1,NumBits,StringType,C,Len); + {Lb,Ub}-> + {Len,Bytes1} = decode_length(Bytes,{Lb,Ub}), + chars_decode(Bytes1,NumBits,StringType,C,Len) + end. + + +encode_NumericString(C,Val) -> + encode_known_multiplier_string('NumericString',C,Val). +decode_NumericString(Bytes,C) -> + decode_known_multiplier_string(Bytes,'NumericString',C,false). + +encode_PrintableString(C,Val) -> + encode_known_multiplier_string('PrintableString',C,Val). +decode_PrintableString(Bytes,C) -> + decode_known_multiplier_string(Bytes,'PrintableString',C,false). + +encode_VisibleString(C,Val) -> % equivalent with ISO646String + encode_known_multiplier_string('VisibleString',C,Val). +decode_VisibleString(Bytes,C) -> + decode_known_multiplier_string(Bytes,'VisibleString',C,false). + +encode_IA5String(C,Val) -> + encode_known_multiplier_string('IA5String',C,Val). +decode_IA5String(Bytes,C) -> + decode_known_multiplier_string(Bytes,'IA5String',C,false). + +encode_BMPString(C,Val) -> + encode_known_multiplier_string('BMPString',C,Val). +decode_BMPString(Bytes,C) -> + decode_known_multiplier_string(Bytes,'BMPString',C,false). + +encode_UniversalString(C,Val) -> + encode_known_multiplier_string('UniversalString',C,Val). +decode_UniversalString(Bytes,C) -> + decode_known_multiplier_string(Bytes,'UniversalString',C,false). + + +%% end of known-multiplier strings for which PER visible constraints are +%% applied + +encode_GeneralString(_C,Val) -> + encode_restricted_string(Val). +decode_GeneralString(Bytes,_C) -> + decode_restricted_string(Bytes). + +encode_GraphicString(_C,Val) -> + encode_restricted_string(Val). +decode_GraphicString(Bytes,_C) -> + decode_restricted_string(Bytes). + +encode_ObjectDescriptor(_C,Val) -> + encode_restricted_string(Val). +decode_ObjectDescriptor(Bytes) -> + decode_restricted_string(Bytes). + +encode_TeletexString(_C,Val) -> % equivalent with T61String + encode_restricted_string(Val). +decode_TeletexString(Bytes,_C) -> + decode_restricted_string(Bytes). + +encode_VideotexString(_C,Val) -> + encode_restricted_string(Val). +decode_VideotexString(Bytes,_C) -> + decode_restricted_string(Bytes). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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 -> + [<<(H-Min):NumBits>>|chars_encode2(T,NumBits,{Min,Max,notab})]; +chars_encode2([H|T],NumBits,{Min,Max,Tab}) when H =< Max, H >= Min -> + Ch = exit_if_false(H,element(H-Min+1,Tab)), + [<<Ch:NumBits>>|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) + Ch = ((((((A bsl 8)+B) bsl 8)+C) bsl 8)+D)-Min, + [<<Ch:NumBits>>|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) + Ch = exit_if_false({A,B,C,D},element(((((((A bsl 8)+B) bsl 8)+C) bsl 8)+D)-Min,Tab)), + [<<Ch:NumBits>>|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)); + no -> + case StringType of + 'IA5String' -> + charbits(128); % 16#00..16#7F + 'VisibleString' -> + charbits(95); % 16#20..16#7E + 'PrintableString' -> + charbits(74); % [$\s,$',$(,$),$+,$,,$-,$.,$/,"0123456789",$:,$=,$?,$A..$Z,$a..$z + 'NumericString' -> + charbits(11); % $ ,"0123456789" + 'UniversalString' -> + 32; + 'BMPString' -> + 16 + 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)]. + +%% See Table 20.3 in Dubuisson +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) -> + {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(byte_size(Val)),Val]; +encode_UTF8String(Val) -> + Bin = list_to_binary(Val), + encode_UTF8String(Bin). + +decode_UTF8String(Bytes) -> + {Len,Bytes2} = decode_length(Bytes, undefined), + getoctets_as_bin(Bytes2,Len). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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 -> [binary()|bitstring()|list()] +%% +encode_object_identifier(Val) -> + OctetList = e_object_identifier(Val), + Octets = list_to_binary(OctetList), % performs a flatten at the same time + [encode_length(byte_size(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(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(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(byte_size(Octets)),Octets]. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_relative_oid(Val) -> CompleteList +%% decode_relative_oid({Name,Val}) -> CompleteList +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}. + + +get_constraint([{Key,V}],Key) -> + V; +get_constraint([],_Key) -> + no; +get_constraint(C,Key) -> + case lists:keyfind(Key, 1, C) of + false -> + no; + {_,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 is_list(InList) -> + case complete1(InList) of + <<>> -> + <<0>>; + Res -> + case bit_size(Res) band 7 of + 0 -> Res; + Bits -> <<Res/bitstring,0:(8-Bits)>> + end + end; +complete(InList) when is_binary(InList) -> + InList; +complete(InList) when is_bitstring(InList) -> + PadLen = 8 - (bit_size(InList) band 7), + <<InList/bitstring,0:PadLen>>. + +complete1(L) when is_list(L) -> + list_to_bitstring(L). + +%% Special version of complete that does not align the completed message. +complete_NFP(InList) when is_list(InList) -> + list_to_bitstring(InList); +complete_NFP(InList) when is_bitstring(InList) -> + InList. + +%% unaligned helpers + +%% 10.5.6 NOTE: If "range" satisfies the inequality 2^m < "range" =< +%% 2^(m+1) then the number of bits = m + 1 + +num_bits(N) -> num_bits(N, 1, 0). + +num_bits(N,T,B) when N =< T -> B; +num_bits(N,T,B) -> num_bits(N, T bsl 1, B+1). |