diff options
Diffstat (limited to 'lib/asn1/src/asn1ct_imm.erl')
| -rw-r--r-- | lib/asn1/src/asn1ct_imm.erl | 92 |
1 files changed, 63 insertions, 29 deletions
diff --git a/lib/asn1/src/asn1ct_imm.erl b/lib/asn1/src/asn1ct_imm.erl index 4b2c3b1b65..bf362db843 100644 --- a/lib/asn1/src/asn1ct_imm.erl +++ b/lib/asn1/src/asn1ct_imm.erl @@ -25,6 +25,7 @@ per_dec_length/3,per_dec_named_integer/3, per_dec_octet_string/2,per_dec_open_type/1,per_dec_real/1, per_dec_restricted_string/1]). +-export([per_dec_constrained/3,per_dec_normally_small_number/1]). -export([optimize_alignment/1,optimize_alignment/2, dec_slim_cg/2,dec_code_gen/2]). -export([effective_constraint/2]). @@ -85,7 +86,7 @@ per_dec_enumerated(BaseNamedList, NamedListExt0, Aligned) -> bit_case(Base, Ext). per_dec_extension_map(Aligned) -> - Len = {add,per_dec_normally_small_number(Aligned),1}, + Len = per_dec_normally_small_length(Aligned), {get_bits,Len,[1,bitstring]}. per_dec_integer(Constraint0, Aligned) -> @@ -94,18 +95,16 @@ per_dec_integer(Constraint0, Aligned) -> per_dec_length(SingleValue, _, _Aligned) when is_integer(SingleValue) -> {value,SingleValue}; -per_dec_length({S,S}, _, _Aligned) when is_integer(S) -> - {value,S}; -per_dec_length({{_,_}=Constr,_}, AllowZero, Aligned) -> +per_dec_length({{Fixed,Fixed},[]}, AllowZero, Aligned) -> + bit_case(per_dec_length(Fixed, AllowZero, Aligned), + per_dec_length(no, AllowZero, Aligned)); +per_dec_length({{_,_}=Constr,[]}, AllowZero, Aligned) -> bit_case(per_dec_length(Constr, AllowZero, Aligned), - per_dec_length(undefined, AllowZero, Aligned)); + per_dec_length(no, AllowZero, Aligned)); per_dec_length({Lb,Ub}, _AllowZero, Aligned) when is_integer(Lb), - is_integer(Lb), - Ub =< 65535 -> + is_integer(Lb) -> per_dec_constrained(Lb, Ub, Aligned); -per_dec_length({_,_}, AllowZero, Aligned) -> - decode_unconstrained_length(AllowZero, Aligned); -per_dec_length(undefined, AllowZero, Aligned) -> +per_dec_length(no, AllowZero, Aligned) -> decode_unconstrained_length(AllowZero, Aligned). per_dec_named_integer(Constraint, NamedList0, Aligned) -> @@ -114,17 +113,27 @@ per_dec_named_integer(Constraint, NamedList0, Aligned) -> {map,Int,NamedList}. per_dec_k_m_string(StringType, Constraint, Aligned) -> - SzConstr = get_constraint(Constraint, 'SizeConstraint'), + SzConstr = effective_constraint(bitstring, Constraint), N = string_num_bits(StringType, Constraint, Aligned), - Imm = dec_string(SzConstr, N, Aligned), + %% X.691 (07/2002) 27.5.7 says if the upper bound times the number + %% of bits is greater than or equal to 16, then the bit field should + %% be aligned. + Imm = dec_string(SzConstr, N, Aligned, fun(_, Ub) -> Ub >= 16 end), Chars = char_tab(Constraint, StringType, N), convert_string(N, Chars, Imm). per_dec_octet_string(Constraint, Aligned) -> - dec_string(Constraint, 8, Aligned). + dec_string(Constraint, 8, Aligned, + %% Aligned unless the size is fixed and =< 16. + fun(Sv, Sv) -> Sv > 16; + (_, _) -> true + end). per_dec_raw_bitstring(Constraint, Aligned) -> - dec_string(Constraint, 1, Aligned). + dec_string(Constraint, 1, Aligned, + fun(Sv, Sv) -> Sv > 16; + (_, _) -> true + end). per_dec_open_type(Aligned) -> {get_bits,decode_unconstrained_length(true, Aligned), @@ -148,21 +157,21 @@ per_dec_restricted_string(Aligned) -> %%% Local functions. %%% -dec_string(Sv, U, _Aligned) when is_integer(Sv), U*Sv =< 16 -> - {get_bits,Sv,[U,binary]}; -dec_string(Sv, U, Aligned) when is_integer(Sv), Sv < 16#10000 -> +dec_string(Sv, U, Aligned0, AF) when is_integer(Sv) -> + Bits = U*Sv, + Aligned = Aligned0 andalso AF(Bits, Bits), {get_bits,Sv,[U,binary,{align,Aligned}]}; -dec_string([_|_]=C, U, Aligned) when is_list(C) -> - dec_string({hd(C),lists:max(C)}, U, Aligned); -dec_string({Sv,Sv}, U, Aligned) -> - dec_string(Sv, U, Aligned); -dec_string({{_,_}=C,_}, U, Aligned) -> - bit_case(dec_string(C, U, Aligned), - dec_string(no, U, Aligned)); -dec_string({Lb,Ub}, U, Aligned) when Ub < 16#10000 -> - Len = per_dec_constrained(Lb, Ub, Aligned), +dec_string({{Sv,Sv},[]}, U, Aligned, AF) -> + bit_case(dec_string(Sv, U, Aligned, AF), + dec_string(no, U, Aligned, AF)); +dec_string({{_,_}=C,[]}, U, Aligned, AF) -> + bit_case(dec_string(C, U, Aligned, AF), + dec_string(no, U, Aligned, AF)); +dec_string({Lb,Ub}, U, Aligned0, AF) -> + Len = per_dec_constrained(Lb, Ub, Aligned0), + Aligned = Aligned0 andalso AF(Lb*U, Ub*U), {get_bits,Len,[U,binary,{align,Aligned}]}; -dec_string(_, U, Aligned) -> +dec_string(_, U, Aligned, _AF) -> Al = [{align,Aligned}], DecRest = fun(V, Buf) -> asn1ct_func:call(per_common, @@ -189,7 +198,7 @@ per_dec_enumerated_fix_list([], Tail, _) -> Tail. per_dec_integer_1([{'SingleValue',Value}], _Aligned) -> {value,Value}; per_dec_integer_1([{'ValueRange',{Lb,'MAX'}}], Aligned) when is_integer(Lb) -> - per_dec_unconstrained(Aligned); + per_decode_semi_constrained(Lb, Aligned); per_dec_integer_1([{'ValueRange',{Lb,Ub}}], Aligned) when is_integer(Lb), is_integer(Ub) -> per_dec_constrained(Lb, Ub, Aligned); @@ -231,6 +240,11 @@ per_dec_normally_small_number(Aligned) -> Unlimited = per_decode_semi_constrained(0, Aligned), bit_case(Small, Unlimited). +per_dec_normally_small_length(Aligned) -> + Small = {add,{get_bits,6,[1]},1}, + Unlimited = decode_unconstrained_length(false, Aligned), + bit_case(Small, Unlimited). + per_decode_semi_constrained(Lb, Aligned) -> add_lb(Lb, {get_bits,decode_unconstrained_length(false, Aligned),[8]}). @@ -700,7 +714,27 @@ effective_constraint(integer, C) -> VR = effective_constr('ValueRange', VRs), greatest_common_range(SV, VR); effective_constraint(bitstring, C) -> - get_constraint(C, 'SizeConstraint'). + case get_constraint(C, 'SizeConstraint') of + {{Lb,Ub},[]}=Range when is_integer(Lb) -> + if + is_integer(Ub), Ub < 16#10000 -> + Range; + true -> + no + end; + {Lb,Ub}=Range when is_integer(Lb) -> + if + is_integer(Ub), Ub < 16#10000 -> + if + Lb =:= Ub -> Lb; + true -> Range + end; + true -> + no + end; + no -> + no + end. effective_constr(_, []) -> []; effective_constr('SingleValue', List) -> |