diff options
Diffstat (limited to 'lib/asn1/src/asn1ct_imm.erl')
| -rw-r--r-- | lib/asn1/src/asn1ct_imm.erl | 43 |
1 files changed, 27 insertions, 16 deletions
diff --git a/lib/asn1/src/asn1ct_imm.erl b/lib/asn1/src/asn1ct_imm.erl index 2c5620d5c8..e0e4a5a451 100644 --- a/lib/asn1/src/asn1ct_imm.erl +++ b/lib/asn1/src/asn1ct_imm.erl @@ -117,15 +117,25 @@ per_dec_named_integer(Constraint, NamedList0, Aligned) -> per_dec_k_m_string(StringType, Constraint, Aligned) -> SzConstr = get_constraint(Constraint, 'SizeConstraint'), 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), @@ -149,21 +159,22 @@ 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), Sv < 16#10000 -> + 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([_|_]=C, U, Aligned, AF) when is_list(C) -> + dec_string({hd(C),lists:max(C)}, U, Aligned, AF); +dec_string({Sv,Sv}, U, Aligned, AF) -> + dec_string(Sv, 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) when Ub < 16#10000 -> + 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, |