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Diffstat (limited to 'lib/asn1/src/asn1rtt_per.erl')
| -rw-r--r-- | lib/asn1/src/asn1rtt_per.erl | 1334 |
1 files changed, 1334 insertions, 0 deletions
diff --git a/lib/asn1/src/asn1rtt_per.erl b/lib/asn1/src/asn1rtt_per.erl new file mode 100644 index 0000000000..d545c8a854 --- /dev/null +++ b/lib/asn1/src/asn1rtt_per.erl @@ -0,0 +1,1334 @@ +%% +%% %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_per). + +-export([setext/1, fixextensions/2, + skipextensions/3, getbit/1, getchoice/3, + set_choice/3,encode_integer/2, + encode_small_number/1, + encode_length/1, + encode_length/2, + decode_compact_bit_string/3, + encode_bit_string/3, decode_bit_string/3, + encode_object_identifier/1, decode_object_identifier/1, + encode_relative_oid/1, decode_relative_oid/1, + complete/1, + encode_open_type/1, + 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_ObjectDescriptor/2, decode_ObjectDescriptor/1, + encode_UTF8String/1,decode_UTF8String/1, + encode_octet_string/3, + encode_known_multiplier_string/4, + decode_known_multiplier_string/5, + octets_to_complete/2]). + +-define('16K',16384). +-define('32K',32768). +-define('64K',65536). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% setext(true|false) -> CompleteList +%% + +setext(false) -> + [0]; +setext(true) -> + [1]. + +fixextensions({ext,ExtPos,ExtNum},Val) -> + case fixextensions(ExtPos,ExtNum+ExtPos,Val,0) of + 0 -> []; + ExtBits -> + [encode_small_length(ExtNum)|pre_complete_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(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) -> {Bin,Rest} +%% Num = integer(), +%% Bytes = bitstring(), +%% Bin = bitstring(), +%% Rest = bitstring() +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}. + +align(Bin) when is_binary(Bin) -> + Bin; +align(BitStr) when is_bitstring(BitStr) -> + AlignBits = bit_size(BitStr) rem 8, + <<_:AlignBits,Rest/binary>> = BitStr, + Rest. + + +%% First align buffer, then pick the first Num octets. +%% Returns octets as an integer with bit significance as in buffer. +getoctets(Buffer, Num) when is_binary(Buffer) -> + <<Val:Num/integer-unit:8,RestBin/binary>> = Buffer, + {Val,RestBin}; +getoctets(Buffer, Num) when is_bitstring(Buffer) -> + AlignBits = bit_size(Buffer) rem 8, + <<_:AlignBits,Val:Num/integer-unit:8,RestBin/binary>> = Buffer, + {Val,RestBin}. + + +%% First align buffer, then pick the first Num octets. +%% Returns octets as a binary +getoctets_as_bin(Bin,Num) when is_binary(Bin) -> + <<Octets:Num/binary,RestBin/binary>> = Bin, + {Octets,RestBin}; +getoctets_as_bin(Bin,Num) when is_bitstring(Bin) -> + AlignBits = bit_size(Bin) rem 8, + <<_:AlignBits,Val:Num/binary,RestBin/binary>> = Bin, + {Val,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, % the value is in the root set + encode_constrained_number({0,Len1-1},N)]; + N when is_integer(N) -> + [0]; % no encoding if only 0 or 1 alternative + false -> + [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_constrained_number({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 binary(). +%% C is the constrained length. +%% If the buffer is not aligned, this function does that. +decode_fragmented_bits(Buffer, C) when is_binary(Buffer) -> + decode_fragmented_bits(Buffer, C, []); +decode_fragmented_bits(Buffer,C) when is_bitstring(Buffer) -> + AlignBits = bit_size(Buffer) rem 8, + <<_:AlignBits,Rest/binary>> = Buffer, + decode_fragmented_bits(Rest,C,[]). + +decode_fragmented_bits(<<3:2,Len:6,Bin/binary>>, C, Acc) -> + {Value,Bin2} = split_binary(Bin, Len * ?'16K'), % Len = 1 | 2 | 3 | 4 + decode_fragmented_bits(Bin2,C,[Value|Acc]); +decode_fragmented_bits(<<0:1,0:7,Bin/binary>>, C, Acc) -> + BinBits = erlang:list_to_bitstring(lists:reverse(Acc)), + case C of + Int when is_integer(Int), C =:= bit_size(BinBits) -> + {BinBits,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) -> + <<Value:Len/bitstring,Rest/bitstring>> = Bin, + BinBits = erlang:list_to_bitstring([Value|Acc]), + case C of + Int when is_integer(Int), C =:= bit_size(BinBits) -> + {BinBits,Rest}; + Int when is_integer(Int) -> + exit({error,{asn1,{illegal_value,C,BinBits}}}) + 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) -> + Bin = list_to_binary(Val), + case byte_size(Bin) of + Size when Size > 255 -> + [encode_length(Size),21,<<Size:16>>,Bin]; + Size -> + [encode_length(Size),20,Size,Bin] + end; +encode_open_type(Val) when is_binary(Val) -> + case byte_size(Val) of + Size when Size > 255 -> + [encode_length(Size),21,<<Size:16>>,Val]; % octets implies align + Size -> + [encode_length(Size),20,Size,Val] + end. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_integer(Constraint, Value) -> CompleteList +%% +encode_integer([{Rc,_Ec}],Val) when is_tuple(Rc) -> + try + [0|encode_integer([Rc], Val)] + catch + _:{error,{asn1,_}} -> + [1|encode_unconstrained_number(Val)] + end; +encode_integer([], Val) -> + encode_unconstrained_number(Val); +%% The constraint is the effective constraint, and in this case is a number +encode_integer([{'SingleValue',V}], V) -> + []; +encode_integer([{'ValueRange',{Lb,Ub}=VR,Range,PreEnc}],Val) + when Val >= Lb, Ub >= Val -> + %% this case when NamedNumberList + encode_constrained_number(VR, Range, PreEnc, Val); +encode_integer([{'ValueRange',{Lb,'MAX'}}], Val) -> + encode_semi_constrained_number(Lb, Val); +encode_integer([{'ValueRange',{'MIN',_}}], Val) -> + encode_unconstrained_number(Val); +encode_integer([{'ValueRange',VR={_Lb,_Ub}}], Val) -> + encode_constrained_number(VR, Val); +encode_integer(_,Val) -> + exit({error,{asn1,{illegal_value,Val}}}). + + +%% 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 -> + [10,7,Val]; +encode_small_number(Val) -> + [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) -> + Val2 = Val - Lb, + Oct = eint_positive(Val2), + Len = length(Oct), + if + Len < 128 -> + [20,Len+1,Len|Oct]; + Len < 256 -> + [encode_length(Len),20,Len|Oct]; + true -> + [encode_length(Len),21,<<Len:16>>|Oct] + end. + +decode_semi_constrained_number(Bytes) -> + {Len,Bytes2} = decode_length(Bytes, undefined), + getoctets(Bytes2, Len). + +encode_constrained_number({Lb,_Ub},_Range,{bits,N},Val) -> + Val2 = Val-Lb, + [10,N,Val2]; +encode_constrained_number({Lb,_Ub},_Range,{octets,N},Val) when N < 256-> + %% N is 8 or 16 (1 or 2 octets) + Val2 = Val-Lb, + [20,N,Val2]; +encode_constrained_number({Lb,_Ub},_Range,{octets,N},Val) -> % N>255 + %% N is 8 or 16 (1 or 2 octets) + Val2 = Val-Lb, + [21,<<N:16>>,Val2]; +encode_constrained_number({Lb,_Ub},Range,_,Val) -> + Val2 = Val-Lb, + if + Range =< 16#1000000 -> % max 3 octets + Octs = eint_positive(Val2), + L = length(Octs), + [encode_length({1,3},L),[20,L,Octs]]; + Range =< 16#100000000 -> % max 4 octets + Octs = eint_positive(Val2), + L = length(Octs), + [encode_length({1,4},L),[20,L,Octs]]; + Range =< 16#10000000000 -> % max 5 octets + Octs = eint_positive(Val2), + L = length(Octs), + [encode_length({1,5},L),[20,L,Octs]]; + true -> + exit({not_supported,{integer_range,Range}}) + end. + +encode_constrained_number({Lb,Ub}, Val) when Val >= Lb, Ub >= Val -> + Range = Ub - Lb + 1, + Val2 = Val - Lb, + if + Range == 1 -> []; + Range == 2 -> + [Val2]; + Range =< 4 -> + [10,2,Val2]; + Range =< 8 -> + [10,3,Val2]; + Range =< 16 -> + [10,4,Val2]; + Range =< 32 -> + [10,5,Val2]; + Range =< 64 -> + [10,6,Val2]; + Range =< 128 -> + [10,7,Val2]; + Range =< 255 -> + [10,8,Val2]; + Range =< 256 -> + [20,1,Val2]; + Range =< 65536 -> + [20,2,<<Val2:16>>]; + Range =< (1 bsl (255*8)) -> + Octs = binary:encode_unsigned(Val2), + RangeOcts = binary:encode_unsigned(Range - 1), + OctsLen = byte_size(Octs), + RangeOctsLen = byte_size(RangeOcts), + LengthBitsNeeded = minimum_bits(RangeOctsLen - 1), + [10,LengthBitsNeeded,OctsLen-1,20,OctsLen,Octs]; + true -> + exit({not_supported,{integer_range,Range}}) + end; +encode_constrained_number({_,_},Val) -> + exit({error,{asn1,{illegal_value,Val}}}). + +decode_constrained_number(Buffer,VR={Lb,Ub}) -> + Range = Ub - Lb + 1, + decode_constrained_number(Buffer,VR,Range). + +decode_constrained_number(Buffer,{Lb,_Ub},Range) -> + % 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 =< (1 bsl (255*8)) -> + OList = binary:bin_to_list(binary:encode_unsigned(Range - 1)), + RangeOctLen = length(OList), + {Len, Bytes} = decode_length(Buffer, {1, RangeOctLen}), + {Octs, RestBytes} = getoctets_as_bin(Bytes, Len), + {binary:decode_unsigned(Octs), RestBytes}; + true -> + exit({not_supported,{integer_range,Range}}) + end, + {Val+Lb,Remain}. + +%% For some reason the minimum bits needed in the length field in +%% the encoding of constrained whole numbers must always be at least 2? +minimum_bits(N) when N < 4 -> 2; +minimum_bits(N) when N < 8 -> 3; +minimum_bits(N) when N < 16 -> 4; +minimum_bits(N) when N < 32 -> 5; +minimum_bits(N) when N < 64 -> 6; +minimum_bits(N) when N < 128 -> 7; +minimum_bits(_N) -> 8. + +%% X.691:10.8 Encoding of an unconstrained whole number + +encode_unconstrained_number(Val) -> + Oct = if + Val >= 0 -> + eint(Val, []); + true -> + enint(Val, []) + end, + Len = length(Oct), + if + Len < 128 -> + [20,Len + 1,Len|Oct]; + Len < 256 -> + [20,Len + 2,<<2:2,Len:14>>|Oct]; + true -> + [encode_length(Len),21,<<Len:16>>|Oct] + end. + +%% used for positive Values which don't need a sign bit +%% returns a list +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]). + +%% 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) -> % unconstrained + if + Len < 128 -> + [20,1,Len]; + Len < 16384 -> + <<20,2,2:2,Len:14>>; + true -> % should be able to endode length >= 16384 i.e. fragmented length + exit({error,{asn1,{encode_length,{nyi,above_16k}}}}) + end. + +encode_length(undefined, Len) -> % un-constrained + 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|encode_constrained_number(Vr,Len)]; +encode_length({{Lb,_},Ext},Len) when is_list(Ext) -> + [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 -> + [10,7,Len-1]; +encode_small_length(Len) -> + [1,encode_length(Len)]. + + +decode_length(Buffer, undefined) -> % un-constrained + case align(Buffer) of + <<0:1,Oct:7,Rest/binary>> -> + {Oct,Rest}; + <<2:2,Val:14,Rest/binary>> -> + {Val,Rest}; + <<3:2,_Val:14,_Rest/binary>> -> + %% this case should be fixed + exit({error,{asn1,{decode_length,{nyi,above_16k}}}}) + end; + +decode_length(Buffer, {Lb,Ub}) when Ub =< 65535 ,Lb >= 0 -> % constrained + decode_constrained_number(Buffer, {Lb,Ub}); +decode_length(Buffer, {Lb,_Ub}) when is_integer(Lb), Lb >= 0 -> % Ub > 65535 + decode_length(Buffer,undefined); +decode_length(Buffer, {{Lb,Ub},Ext}) when is_list(Ext) -> + case getbit(Buffer) of + {0,Buffer2} -> + decode_length(Buffer2, {Lb,Ub}); + {1,Buffer2} -> + decode_length(Buffer2, undefined) + end; + +%When does this case occur with {_,_Lb,Ub} ?? +% X.691:10.9.3.5 +decode_length(Bin, {_,_Lb,_Ub}) -> % 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}; + _ -> + case align(Bin) of + <<2:2,Val:14,Rest/binary>> -> + {Val,Rest}; + <<3:2,_:14,_Rest/binary>> -> + exit({error,{asn1,{decode_length,{nyi,length_above_64K}}}}) + end + end; +decode_length(Buffer, SingleValue) when is_integer(SingleValue) -> + {SingleValue,Buffer}. + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% 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, {Unused,BinBits}=Bin, 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);% consider the constraint + +encode_bit_string(C, BL=[{bit,_} | _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(Int, BitListValue, _) + when is_list(BitListValue),is_integer(Int),Int =< 16 -> + %% The type is constrained by a single value size constraint + %% range_check(Int,length(BitListValue)), + [40,Int,length(BitListValue),BitListValue]; +encode_bit_string(Int, BitListValue, _) + when is_list(BitListValue),is_integer(Int), Int =< 255 -> + %% The type is constrained by a single value size constraint + %% range_check(Int,length(BitListValue)), + [2,40,Int,length(BitListValue),BitListValue]; +encode_bit_string(Int, BitListValue, _) + when is_list(BitListValue),is_integer(Int), Int < ?'64K' -> + {Code,DesiredLength,Length} = + case length(BitListValue) of + B1 when B1 > Int -> + exit({error,{'BIT_STRING_length_greater_than_SIZE', + Int,BitListValue}}); + B1 when B1 =< 255,Int =< 255 -> + {40,Int,B1}; + B1 when B1 =< 255 -> + {42,<<Int:16>>,B1}; + B1 -> + {43,<<Int:16>>,<<B1:16>>} + end, + %% The type is constrained by a single value size constraint + [2,Code,DesiredLength,Length,BitListValue]; +encode_bit_string(no, BitListValue,[]) + when is_list(BitListValue) -> + [encode_length(length(BitListValue)), + 2|BitListValue]; +encode_bit_string({{Fix,Fix},Ext}, BitListValue,[]) + when is_integer(Fix), is_list(Ext) -> + case length(BitListValue) of + Len when Len =< Fix -> + [0|encode_bit_string(Fix, BitListValue, [])]; + _ -> + [1|encode_bit_string(no, BitListValue, [])] + end; +encode_bit_string(C, BitListValue,[]) + when is_list(BitListValue) -> + [encode_length(C, length(BitListValue)), + 2|BitListValue]; +encode_bit_string(no, BitListValue,_NamedBitList) + when is_list(BitListValue) -> + %% this case with an unconstrained BIT STRING can be made more efficient + %% if the complete driver can take a special code so the length field + %% is encoded there. + NewBitLVal = lists:reverse(lists:dropwhile(fun(0)->true;(1)->false end, + lists:reverse(BitListValue))), + [encode_length(length(NewBitLVal)),2|NewBitLVal]; +encode_bit_string({{Fix,Fix},Ext}, BitListValue, NamedBitList) + when is_integer(Fix), is_list(Ext) -> + case length(BitListValue) of + Len when Len =< Fix -> + [0|encode_bit_string(Fix, BitListValue, NamedBitList)]; + _ -> + [1|encode_bit_string(no, BitListValue, NamedBitList)] + end; +encode_bit_string(C, BitListValue, _NamedBitList) + when is_list(BitListValue) -> % C = {_,'MAX'} + NewBitLVal = bit_string_trailing_zeros(BitListValue, C), + [encode_length(C, length(NewBitLVal)),2|NewBitLVal]; + + +%% 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). + +bit_string_trailing_zeros(BitList,C) when is_integer(C) -> + bit_string_trailing_zeros1(BitList,C,C); +bit_string_trailing_zeros(BitList,{Lb,Ub}) when is_integer(Lb) -> + bit_string_trailing_zeros1(BitList,Lb,Ub); +bit_string_trailing_zeros(BitList,{{Lb,Ub},_}) when is_integer(Lb) -> + bit_string_trailing_zeros1(BitList,Lb,Ub); +bit_string_trailing_zeros(BitList,_) -> + BitList. + +bit_string_trailing_zeros1(BitList,Lb,Ub) -> + case length(BitList) of + Lb -> BitList; + B when B < Lb -> BitList++lists:duplicate(Lb-B, 0); + D -> F = fun(L,LB,LB,_,_)->lists:reverse(L); + ([0|R],L1,LB,UB,Fun)->Fun(R,L1-1,LB,UB,Fun); + (L,L1,_,UB,_)when L1 =< UB -> 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, {Unused,BinBits}, _NamedBitList) + when is_integer(C),C=<16 -> + range_check(C, bit_size(BinBits) - Unused), + [45,C,size(BinBits),BinBits]; +encode_bin_bit_string(C, {Unused,BinBits}, _NamedBitList) + when is_integer(C), C =< 255 -> + range_check(C, bit_size(BinBits) - Unused), + [2,45,C,size(BinBits),BinBits]; +encode_bin_bit_string(C, {Unused,BinBits}, _NamedBitList) + when is_integer(C), C =< 65535 -> + range_check(C, bit_size(BinBits) - Unused), + case byte_size(BinBits) of + Size when Size =< 255 -> + [2,46,<<C:16>>,Size,BinBits]; + Size -> + [2,47,<<C:16>>,<<Size:16>>,BinBits] + end; +encode_bin_bit_string(C,UnusedAndBin={_,_},NamedBitList) -> + {Unused1,Bin1} = + %% removes all trailing bits if NamedBitList is not empty + remove_trailing_bin(NamedBitList,UnusedAndBin), + case C of + {Lb,Ub} when is_integer(Lb),is_integer(Ub) -> + Size = byte_size(Bin1), + [encode_length({Lb,Ub}, Size*8 - Unused1), + 2,octets_unused_to_complete(Unused1,Size,Bin1)]; + no -> + Size = byte_size(Bin1), + [encode_length(Size*8 - Unused1), + 2|octets_unused_to_complete(Unused1, Size, Bin1)]; + {{Fix,Fix},Ext} when is_integer(Fix),is_list(Ext) -> + case byte_size(Bin1)*8 - Unused1 of + Size when Size =< Fix -> + [0|encode_bin_bit_string(Fix,UnusedAndBin,NamedBitList)]; + _Size -> + [1|encode_bin_bit_string(no,UnusedAndBin,NamedBitList)] + end; + Sc -> + Size = byte_size(Bin1), + [encode_length(Sc, Size*8 - Unused1), + 2|octets_unused_to_complete(Unused1,Size,Bin1)] + end. + +range_check(C,C) when is_integer(C) -> + ok; +range_check(C1,C2) when is_integer(C1) -> + exit({error,{asn1,{bit_string_out_of_range,{C1,C2}}}}). + +remove_trailing_bin([], {Unused,Bin}) -> + {Unused,Bin}; +remove_trailing_bin(_NamedNumberList,{_Unused,<<>>}) -> + {0,<<>>}; +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}); + _ -> + {Unused2,Bin} + 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 + Bytes2 = align(Buffer), + compact_bit_string(Bytes2,V,NamedNumberList); + V when is_integer(V) -> % V > 65536 => fragmented value + {BitStr,Buffer2} = decode_fragmented_bits(Buffer,V), + case bit_size(BitStr) band 7 of + 0 -> {{0,BitStr},Buffer2}; + N -> {{8-N,<<BitStr/bitstring,0:(8-N)>>},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},Ext} = Sc when is_integer(Fix), is_list(Ext) -> + case decode_length(Buffer,Sc) of + {Len,Bytes2} when Len > Fix -> + Bytes3 = align(Bytes2), + compact_bit_string(Bytes3,Len,NamedNumberList); + {Len,Bytes2} when Len > 16 -> + 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,_Bytes3} = decode_fragmented_bits(Bytes2,V), + bit_list_or_named(BinBits,V,NamedNumberList); + {{Fix,Fix},Ext} =Sc when is_integer(Fix), is_list(Ext) -> + 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 -> % 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,[]) -> + {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(_Pos,[],_Names,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,ExtensionMarker,Val) +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% + +encode_octet_string(_C, true, _Val) -> + exit({error,{asn1,{'not_supported',extensionmarker}}}); +encode_octet_string({_,_}=SZ, false, Val) -> + Len = length(Val), + try + [encode_length(SZ, Len),2|octets_to_complete(Len, Val)] + catch + exit:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end; +encode_octet_string(SZ, false, Val) when is_list(SZ) -> + Len = length(Val), + try + [encode_length({hd(SZ),lists:max(SZ)},Len),2| + octets_to_complete(Len,Val)] + catch + exit:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end; +encode_octet_string(Sv, false, Val) when is_integer(Sv) -> + encode_fragmented_octet_string(Val); +encode_octet_string(no, false, Val) -> + Len = length(Val), + try + [encode_length(Len),2|octets_to_complete(Len, Val)] + catch + exit:{error,{asn1,{encode_length,_}}} -> + encode_fragmented_octet_string(Val) + end; +encode_octet_string(C, _, _) -> + exit({error,{not_implemented,C}}). + +encode_fragmented_octet_string(Val) -> + Bin = iolist_to_binary(Val), + efos_1(Bin). + +efos_1(<<B1:16#C000/binary,B2:16#4000/binary,T/binary>>) -> + [20,1,<<3:2,4:6>>, + octets_to_complete(16#C000, B1), + octets_to_complete(16#4000, B2)|efos_1(T)]; +efos_1(<<B:16#C000/binary,T/binary>>) -> + [20,1,<<3:2,3:6>>,octets_to_complete(16#C000, B)|efos_1(T)]; +efos_1(<<B:16#8000/binary,T/binary>>) -> + [20,1,<<3:2,2:6>>,octets_to_complete(16#8000, B)|efos_1(T)]; +efos_1(<<B:16#4000/binary,T/binary>>) -> + [20,1,<<3:2,1:6>>,octets_to_complete(16#4000, B)|efos_1(T)]; +efos_1(<<>>) -> + [20,1,0]; +efos_1(<<B/bitstring>>) -> + Len = byte_size(B), + [encode_length(Len)|octets_to_complete(Len, B)]. + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% Restricted char string types +%% (NumericString, PrintableString,VisibleString,IA5String,BMPString,UniversalString) +%% X.691:26 and X.680:34-36 + +encode_restricted_string(Val) when is_list(Val)-> + Len = length(Val), + [encode_length(Len)|octets_to_complete(Len, Val)]. + +encode_known_multiplier_string(SizeC, NumBits, CharOutTab, Val) -> + Result = chars_encode2(Val, NumBits, CharOutTab), + case SizeC of + Ub when is_integer(Ub), Ub*NumBits =< 16 -> + Result; + Ub when is_integer(Ub), Ub =<65535 -> % fixed length + [2,Result]; + {Ub,Lb} -> + [encode_length({Ub,Lb},length(Val)),2,Result]; + no -> + [encode_length(length(Val)),2,Result] + end. + +decode_restricted_string(Bytes,aligned) -> + {Len,Bytes2} = decode_length(Bytes,undefined), + getoctets_as_list(Bytes2,Len). + +decode_known_multiplier_string(StringType,SizeC,NumBits,CharInTab,Bytes) -> + case SizeC of + Ub when is_integer(Ub), Ub*NumBits =< 16 -> + chars_decode(Bytes,NumBits,StringType,CharInTab,Ub); + Ub when is_integer(Ub),Ub =<65535 -> % fixed length + Bytes1 = align(Bytes), + chars_decode(Bytes1,NumBits,StringType,CharInTab,Ub); + Vl when is_list(Vl) -> + {Len,Bytes1} = decode_length(Bytes,{hd(Vl),lists:max(Vl)}), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,CharInTab,Len); + no -> + {Len,Bytes1} = decode_length(Bytes,undefined), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,CharInTab,Len); + {Lb,Ub}-> + {Len,Bytes1} = decode_length(Bytes,{Lb,Ub}), + Bytes2 = align(Bytes1), + chars_decode(Bytes2,NumBits,StringType,CharInTab,Len) + end. + +encode_GeneralString(_C,Val) -> + encode_restricted_string(Val). +decode_GeneralString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_GraphicString(_C,Val) -> + encode_restricted_string(Val). +decode_GraphicString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_ObjectDescriptor(_C,Val) -> + encode_restricted_string(Val). +decode_ObjectDescriptor(Bytes) -> + decode_restricted_string(Bytes,aligned). + +encode_TeletexString(_C,Val) -> % equivalent with T61String + encode_restricted_string(Val). +decode_TeletexString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + +encode_VideotexString(_C,Val) -> + encode_restricted_string(Val). +decode_VideotexString(Bytes,_C) -> + decode_restricted_string(Bytes,aligned). + + + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% getBMPChars(Bytes,Len) ->{BMPcharList,RemainingBytes} +%% +getBMPChars(<<T/binary>>, 0, Acc) -> + {lists:reverse(Acc),T}; +getBMPChars(<<0,O2,Bytes1/bitstring>>, Len, Acc) -> + getBMPChars(Bytes1,Len-1,[O2|Acc]); +getBMPChars(<<O1,O2,Bytes1/bitstring>>, Len, Acc) -> + getBMPChars(Bytes1,Len-1,[{0,0,O1,O2}|Acc]). + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% chars_encode(C,StringType,Value) -> ValueList +%% +%% encodes chars according to the per rules taking the constraint +%% PermittedAlphabet into account. +%% +%% This function only encodes the value part and NOT the length. + +chars_encode2([H|T],NumBits,T1={Min,Max,notab}) when H =< Max, H >= Min -> + [pre_complete_bits(NumBits,H-Min)|chars_encode2(T,NumBits,T1)]; +chars_encode2([H|T],NumBits,T1={Min,Max,Tab}) when H =< Max, H >= Min -> + [pre_complete_bits(NumBits,exit_if_false(H,element(H-Min+1,Tab)))| + chars_encode2(T,NumBits,T1)]; +chars_encode2([{A,B,C,D}|T],NumBits,T1={Min,_Max,notab}) -> + %% no value range check here (ought to be, but very expensive) + [pre_complete_bits(NumBits, + ((((((A bsl 8)+B) bsl 8)+C) bsl 8)+D)-Min)| + chars_encode2(T,NumBits,T1)]; +chars_encode2([H={A,B,C,D}|T],NumBits,{Min,Max,Tab}) -> + %% no value range check here (ought to be, but very expensive) + [pre_complete_bits(NumBits,exit_if_false(H,element(((((((A bsl 8)+B) bsl 8)+C) bsl 8)+D)-Min,Tab)))|chars_encode2(T,NumBits,{Min,Max,notab})]; +chars_encode2([H|_T],_NumBits,{_Min,_Max,_Tab}) -> + 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. + +pre_complete_bits(NumBits,Val) when NumBits =< 8 -> + [10,NumBits,Val]; +pre_complete_bits(NumBits,Val) when NumBits =< 16 -> + [10,NumBits-8,Val bsr 8,10,8,(Val band 255)]; +pre_complete_bits(NumBits,Val) when NumBits =< 2040 -> % 255 * 8 + Unused = (8 - (NumBits rem 8)) rem 8, + Len = NumBits + Unused, + [30,Unused,Len div 8,<<(Val bsl Unused):Len>>]. + + +chars_decode(Bytes,_,'BMPString',_,Len) -> + getBMPChars(Bytes,Len,[]); +chars_decode(Bytes,NumBits,_StringType,CharInTab,Len) -> + 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]). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% encode_UTF8String(Val) -> CompleteList +%% Val -> <<utf8encoded binary>> +%% CompleteList -> [apropriate codes and values for driver complete] +%% +encode_UTF8String(Val) when is_binary(Val) -> + Sz = byte_size(Val), + [encode_length(Sz),octets_to_complete(Sz, Val)]; +encode_UTF8String(Val) -> + encode_UTF8String(list_to_binary(Val)). + + +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% +%% decode_UTF8String(Bytes) -> {Utf8Binary,RemainingBytes} +%% Utf8Binary -> <<utf8 encoded binary>> +%% RemainingBytes -> <<buffer>> +decode_UTF8String(Bytes) -> + {Len,Bytes2} = decode_length(Bytes, undefined), + {_Bin,_Bytes3} = 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 -> [{bits,8,Val}|{octets,Ol}|align|...] +%% +encode_object_identifier(Val) -> + OctetList = e_object_identifier(Val), + Octets = list_to_binary(OctetList), + Sz = byte_size(Octets), + [encode_length(Sz), + octets_to_complete(Sz, Octets)]. + +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]), + Sz = byte_size(Octets), + [encode_length(Sz)|octets_to_complete(Sz, 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([],_) -> + 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(L) -> + case asn1rt_nif:encode_per_complete(L) of + {error, Reason} -> handle_error(Reason, L); + Else when is_binary(Else) -> Else + end. + +handle_error([],_)-> + exit({error,{asn1,{"memory allocation problem in driver"}}}); +handle_error($1,L) -> % error in complete in driver + exit({error,{asn1,L}}); +handle_error(ErrL,L) -> + exit({error,{asn1,ErrL,L}}). + +octets_to_complete(Len,Val) when Len < 256 -> + [20,Len,Val]; +octets_to_complete(Len,Val) -> + [21,<<Len:16>>,Val]. + +octets_unused_to_complete(Unused,Len,Val) when Len < 256 -> + [30,Unused,Len,Val]; +octets_unused_to_complete(Unused,Len,Val) -> + [31,Unused,<<Len:16>>,Val]. |