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-rw-r--r--lib/asn1/src/asn1rtt_per_common.erl24
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/asn1/src/asn1rtt_per_common.erl b/lib/asn1/src/asn1rtt_per_common.erl
index 3309e6a4ca..e84fa581df 100644
--- a/lib/asn1/src/asn1rtt_per_common.erl
+++ b/lib/asn1/src/asn1rtt_per_common.erl
@@ -37,7 +37,8 @@
bitstring_from_positions/1,bitstring_from_positions/2,
to_bitstring/1,to_bitstring/2,
to_named_bitstring/1,to_named_bitstring/2,
- is_default_bitstring/5,
+ bs_drop_trailing_zeroes/1,adjust_trailing_zeroes/2,
+ is_default_bitstring/3,is_default_bitstring/5,
extension_bitmap/3]).
-define('16K',16384).
@@ -272,6 +273,25 @@ to_named_bitstring(Val, Lb) ->
%% for correctness, not speed.
adjust_trailing_zeroes(to_bitstring(Val), Lb).
+is_default_bitstring(asn1_DEFAULT, _, _) ->
+ true;
+is_default_bitstring(Named, Named, _) ->
+ true;
+is_default_bitstring(Bs, _, Bs) ->
+ true;
+is_default_bitstring(Val, _, Def) when is_bitstring(Val) ->
+ Sz = bit_size(Def),
+ case Val of
+ <<Def:Sz/bitstring,T/bitstring>> ->
+ NumZeroes = bit_size(T),
+ case T of
+ <<0:NumZeroes>> -> true;
+ _ -> false
+ end;
+ _ ->
+ false
+ end.
+
is_default_bitstring(asn1_DEFAULT, _, _, _, _) ->
true;
is_default_bitstring({Unused,Bin}, V0, V1, V2, V3) when is_integer(Unused) ->
@@ -438,6 +458,8 @@ adjust_trailing_zeroes(Bs0, Lb) ->
bs_drop_trailing_zeroes(Bs) ->
bs_drop_trailing_zeroes(Bs, bit_size(Bs)).
+bs_drop_trailing_zeroes(Bs, 0) ->
+ Bs;
bs_drop_trailing_zeroes(Bs0, Sz0) when Sz0 < 8 ->
<<Byte:Sz0>> = Bs0,
Sz = Sz0 - ntz(Byte),