From 6baa1883a9c7f4d9b4be76d1375cf8b2cc614797 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20Gustavsson?= Date: Fri, 27 Sep 2013 14:11:54 +0200 Subject: Fix broken handling of default values for BIT STRINGs For DER/PER/UPER, a value equal to the DEFAULT is not supposed to be encoded. BIT STRINGs values can be represented as Erlang terms in four different ways: as an integer, as a list of zeroes and ones, as a {Unused,Binary} tuple, or as an Erlang bitstring. When encoding a BIT STRING, only certain representations of BIT STRINGs values were recognized. All representations must be recognized. When decoding a DEFAULT value for a BIT STRING, the actual value given in the decoding would be either an integer or a list of zeroes and one (depending on how the literal was written in the specification). We expect that the default value should be in the same representation as any other BIT STRING value (i.e. by default an Erlang bitstring, or a list if the 'legacy_bitstring' option has been given, or as compact bitstring if 'compact_bitstring' has been given). --- lib/asn1/test/testPrimStrings.erl | 41 +++++++++++++++++++++++++++++++++------ 1 file changed, 35 insertions(+), 6 deletions(-) (limited to 'lib/asn1/test/testPrimStrings.erl') diff --git a/lib/asn1/test/testPrimStrings.erl b/lib/asn1/test/testPrimStrings.erl index be5409aa92..2fe0780701 100644 --- a/lib/asn1/test/testPrimStrings.erl +++ b/lib/asn1/test/testPrimStrings.erl @@ -19,7 +19,7 @@ %% -module(testPrimStrings). --export([bit_string/1]). +-export([bit_string/2]). -export([octet_string/1]). -export([numeric_string/1]). -export([other_strings/1]). @@ -68,7 +68,7 @@ fragmented_lengths() -> K64-1,K64,K64+1,K64+(1 bsl 7)-1,K64+(1 bsl 7),K64+(1 bsl 7)+1, K64+K16-1,K64+K16,K64+K16+1]. -bit_string(Rules) -> +bit_string(Rules, Opts) -> %%========================================================== %% Bs1 ::= BIT STRING @@ -90,9 +90,10 @@ bit_string(Rules) -> bs_roundtrip('Bs1', [0,1,0,0,1,0]), bs_roundtrip('Bs1', [1,0,0,0,0,0,0,0,0]), bs_roundtrip('Bs1', [0,1,0,0,1,0,1,1,1,1,1,0,0,0,1,0,0,1,1]), - - case Rules of - ber -> + + + case {Rules,Opts} of + {ber,[]} -> bs_decode('Bs1', <<35,8,3,2,0,73,3,2,4,32>>, [0,1,0,0,1,0,0,1,0,0,1,0]), bs_decode('Bs1', <<35,9,3,2,0,234,3,3,7,156,0>>, @@ -100,7 +101,17 @@ bit_string(Rules) -> bs_decode('Bs1', <<35,128,3,2,0,234,3,3,7,156,0,0,0>>, [1,1,1,0,1,0,1,0,1,0,0,1,1,1,0,0,0]); _ -> - ok + %% DER, PER, UPER + consistent_def_enc('BsDef1', + [2#111101, + [1,0,1,1,1,1], + {2,<<2#101111:6,0:2>>}, + <<2#101111:6>>]), + consistent_def_enc('BsDef2', + [[1,1,0,1, 1,1,1,0, 1,0,1,0, 1,1,0,1, + 1,0,1,1, 1,1,1,0, 1,1,1,0, 1,1,1,1], + {0,<<16#DEADBEEF:4/unit:8>>}, + <<16#DEADBEEF:4/unit:8>>]) end, @@ -217,6 +228,24 @@ bit_string(Rules) -> _ -> per_bs_strings() end. +consistent_def_enc(Type, Vs) -> + M = 'PrimStrings', + {ok,Enc} = M:encode(Type, {Type,asn1_DEFAULT}), + {ok,Val} = M:decode(Type, Enc), + + %% Ensure that the value has the correct format. + case {M:bit_string_format(),Val} of + {bitstring,{_,Bs}} when is_bitstring(Bs) -> ok; + {compact,{_,{Unused,Bin}}} when is_integer(Unused), + is_binary(Bin) -> ok; + {legacy,{_,Bs}} when is_list(Bs) -> ok + end, + + %% All values should be recognized and encoded as the + %% the default value (i.e. not encoded at all). + _ = [{ok,Enc} = M:encode(Type, {Type,V}) || V <- Vs], + ok. + %% The PER encoding rules requires that a BIT STRING with %% named positions should never have any trailing zeroes %% (except to reach the minimum number of bits as given by -- cgit v1.2.3