diff options
Diffstat (limited to 'lib/asn1/src/asn1rt_per_bin.erl')
| -rw-r--r-- | lib/asn1/src/asn1rt_per_bin.erl | 46 |
1 files changed, 23 insertions, 23 deletions
diff --git a/lib/asn1/src/asn1rt_per_bin.erl b/lib/asn1/src/asn1rt_per_bin.erl index a124c7553d..85988aa21d 100644 --- a/lib/asn1/src/asn1rt_per_bin.erl +++ b/lib/asn1/src/asn1rt_per_bin.erl @@ -18,7 +18,6 @@ %% %% -module(asn1rt_per_bin). - %% encoding / decoding of PER aligned -include("asn1_records.hrl"). @@ -57,7 +56,7 @@ encode_NumericString/2, decode_NumericString/2, encode_ObjectDescriptor/2, decode_ObjectDescriptor/1 ]). --export([complete_bytes/1, getbits/2, getoctets/2]). +-export([complete_bytes/1, getbits/2, getoctets/2, minimum_bits/1]). -define('16K',16384). -define('32K',32768). @@ -695,21 +694,28 @@ encode_constrained_number({Lb,Ub},Val) when Val >= Lb, Ub >= Val -> {octets,[Val2]}; Range =< 65536 -> {octets,<<Val2:16>>}; - Range =< 16#1000000 -> - Octs = eint_positive(Val2), - [{bits,2,length(Octs)-1},{octets,Octs}]; - Range =< 16#100000000 -> - Octs = eint_positive(Val2), - [{bits,2,length(Octs)-1},{octets,Octs}]; - Range =< 16#10000000000 -> - Octs = eint_positive(Val2), - [{bits,3,length(Octs)-1},{octets,Octs}]; + Range =< (1 bsl (255*8)) -> + Octs = binary:encode_unsigned(Val2), + RangeOcts = binary:encode_unsigned(Range - 1), + OctsLen = erlang:byte_size(Octs), + RangeOctsLen = erlang:byte_size(RangeOcts), + LengthBitsNeeded = minimum_bits(RangeOctsLen - 1), + [{bits, LengthBitsNeeded, OctsLen - 1}, {octets, Octs}]; true -> exit({not_supported,{integer_range,Range}}) end; encode_constrained_number(Range,Val) -> exit({error,{asn1,{integer_range,Range,value,Val}}}). +%% For some reason the minimum bits needed in the length field in encoding of +%% constrained whole numbers must always be atleast 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. decode_constrained_number(Buffer,{Lb,Ub}) -> Range = Ub - Lb + 1, @@ -738,18 +744,12 @@ decode_constrained_number(Buffer,{Lb,Ub}) -> getoctets(Buffer,1); Range =< 65536 -> getoctets(Buffer,2); - Range =< 16#1000000 -> - {Len,Bytes2} = decode_length(Buffer,{1,3}), - {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), - {dec_pos_integer(Octs),Bytes3}; - Range =< 16#100000000 -> - {Len,Bytes2} = decode_length(Buffer,{1,4}), - {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), - {dec_pos_integer(Octs),Bytes3}; - Range =< 16#10000000000 -> - {Len,Bytes2} = decode_length(Buffer,{1,5}), - {Octs,Bytes3} = getoctets_as_list(Bytes2,Len), - {dec_pos_integer(Octs),Bytes3}; + 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_list(Bytes, Len), + {binary:decode_unsigned(binary:list_to_bin(Octs)), RestBytes}; true -> exit({not_supported,{integer_range,Range}}) end, |