diff options
author | Björn Gustavsson <bjorn@erlang.org> | 2014-04-15 08:24:51 +0200 |
---|---|---|
committer | Björn Gustavsson <bjorn@erlang.org> | 2014-04-29 06:24:19 +0200 |
commit | 1e8f50885a6faf95d8780cacd918b9084eba8b49 (patch) | |
tree | 5c6c589bbc8d8d4733878560fa17867314be25c8 /lib/asn1 | |
parent | c3c7dce82e3fd309f89e91a1e52109e5373ffd71 (diff) | |
download | otp-1e8f50885a6faf95d8780cacd918b9084eba8b49.tar.gz otp-1e8f50885a6faf95d8780cacd918b9084eba8b49.tar.bz2 otp-1e8f50885a6faf95d8780cacd918b9084eba8b49.zip |
BER: Inline testing of constraints when decoding
Calling library routines for validation of constraints may cause
dialyzer warnings if some type of constraints handled by the library
routine are not used in a specific ASN.1 module. To avoid those
warnings (and slightly speed up the decoding), inline the constraint
checking.
Diffstat (limited to 'lib/asn1')
-rw-r--r-- | lib/asn1/src/asn1ct_gen_ber_bin_v2.erl | 157 | ||||
-rw-r--r-- | lib/asn1/src/asn1rtt_ber.erl | 102 |
2 files changed, 134 insertions, 125 deletions
diff --git a/lib/asn1/src/asn1ct_gen_ber_bin_v2.erl b/lib/asn1/src/asn1ct_gen_ber_bin_v2.erl index 09cb7c0628..6db31c5ea2 100644 --- a/lib/asn1/src/asn1ct_gen_ber_bin_v2.erl +++ b/lib/asn1/src/asn1ct_gen_ber_bin_v2.erl @@ -492,6 +492,11 @@ gen_dec_prim(Att, BytesVar, DoTag) -> 'ObjectDescriptor'-> restricted_string; 'UTCTime' -> restricted_string; 'GeneralizedTime' -> restricted_string; + 'OCTET STRING' -> + case asn1ct:use_legacy_types() of + true -> restricted_string; + false -> Typename + end; _ -> Typename end, TagStr = case DoTag of @@ -502,26 +507,23 @@ gen_dec_prim(Att, BytesVar, DoTag) -> 'BOOLEAN'-> call(decode_boolean, [BytesVar,TagStr]); 'INTEGER' -> - case IntConstr of - [] -> - call(decode_integer, [BytesVar,TagStr]); - {_,_} -> - call(decode_integer, [BytesVar,{asis,IntConstr},TagStr]) - end; - {'INTEGER',NamedNumberList} -> - case IntConstr of - [] -> - call(decode_named_integer, - [BytesVar, - {asis,NamedNumberList}, - TagStr]); - {_,_} -> - call(decode_named_integer, - [BytesVar, - {asis,IntConstr}, - {asis,NamedNumberList}, - TagStr]) - end; + check_constraint(decode_integer, [BytesVar,TagStr], + IntConstr, + identity, + identity); + {'INTEGER',NNL} -> + check_constraint(decode_integer, + [BytesVar,TagStr], + IntConstr, + identity, + fun(Val) -> + asn1ct_name:new(val), + emit([{curr,val}," = "]), + Val(), + emit([com,nl, + {call,ber,number2name, + [{curr,val},{asis,NNL}]}]) + end); {'ENUMERATED',NNL} -> call(decode_enumerated, [BytesVar,{asis,NNL},TagStr]); 'REAL' -> @@ -540,32 +542,25 @@ gen_dec_prim(Att, BytesVar, DoTag) -> 'RELATIVE-OID' -> call(decode_relative_oid, [BytesVar,TagStr]); 'OCTET STRING' -> - F = case asn1ct:use_legacy_types() of - false -> decode_octet_string; - true -> decode_restricted_string - end, - case Constraint of - [] -> - call(F, [BytesVar,TagStr]); - _ -> - call(F, [BytesVar,{asis,Constraint},TagStr]) - end; + check_constraint(decode_octet_string, [BytesVar,TagStr], + Constraint, {erlang,byte_size}, identity); restricted_string -> - case Constraint of - [] -> - call(decode_restricted_string, - [BytesVar,TagStr]); - _ -> - call(decode_restricted_string, - [BytesVar,{asis,Constraint},TagStr]) - end; + check_constraint(decode_restricted_string, [BytesVar,TagStr], + Constraint, + {erlang,byte_size}, + fun(Val) -> + emit("binary_to_list("), + Val(), + emit(")") + end); 'UniversalString' -> - call(decode_universal_string, - [BytesVar,{asis,Constraint},TagStr]); + check_constraint(decode_universal_string, [BytesVar,TagStr], + Constraint, {erlang,length}, identity); 'UTF8String' -> call(decode_UTF8_string, [BytesVar,TagStr]); 'BMPString' -> - call(decode_BMP_string, [BytesVar,{asis,Constraint},TagStr]); + check_constraint(decode_BMP_string, [BytesVar,TagStr], + Constraint, {erlang,length}, identity); 'ASN1_OPEN_TYPE' -> call(decode_open_type_as_binary, [BytesVar,TagStr]) end. @@ -583,7 +578,7 @@ int_constr(C) -> [{'ValueRange',{_,_}=Range}] -> Range; [{'SingleValue',Sv}] -> - {Sv,Sv}; + Sv; [] -> [] end. @@ -594,16 +589,82 @@ gen_dec_bit_string(BytesVar, _Constraint, [_|_]=NNL, TagStr) -> gen_dec_bit_string(BytesVar, Constraint, [], TagStr) -> case asn1ct:get_bit_string_format() of compact -> - call(decode_compact_bit_string, - [BytesVar,{asis,Constraint},TagStr]); + check_constraint(decode_compact_bit_string, + [BytesVar,TagStr], + Constraint, + {ber,compact_bit_string_size}, + identity); legacy -> - call(decode_legacy_bit_string, - [BytesVar,{asis,Constraint},TagStr]); + check_constraint(decode_native_bit_string, + [BytesVar,TagStr], + Constraint, + {erlang,bit_size}, + fun(Val) -> + asn1ct_name:new(val), + emit([{curr,val}," = "]), + Val(), + emit([com,nl, + {call,ber,native_to_legacy_bit_string, + [{curr,val}]}]) + end); bitstring -> - call(decode_native_bit_string, - [BytesVar,{asis,Constraint},TagStr]) + check_constraint(decode_native_bit_string, + [BytesVar,TagStr], + Constraint, + {erlang,bit_size}, + identity) end. +check_constraint(F, Args, Constr, PreConstr0, ReturnVal0) -> + PreConstr = case PreConstr0 of + identity -> + fun(V) -> V end; + {Mod,Name} -> + fun(V) -> + asn1ct_name:new(c), + emit([{curr,c}," = ", + {call,Mod,Name,[V]},com,nl]), + {curr,c} + end + end, + ReturnVal = case ReturnVal0 of + identity -> fun(Val) -> Val() end; + _ -> ReturnVal0 + end, + case Constr of + [] when ReturnVal0 =:= identity -> + %% No constraint, no complications. + call(F, Args); + [] -> + %% No constraint, but the return value could consist + %% of more than one statement. + emit(["begin",nl]), + ReturnVal(fun() -> call(F, Args) end), + emit([nl, + "end",nl]); + _ -> + %% There is a constraint. + asn1ct_name:new(val), + emit(["begin",nl, + {curr,val}," = ",{call,ber,F,Args},com,nl]), + PreVal0 = asn1ct_gen:mk_var(asn1ct_name:curr(val)), + PreVal = PreConstr(PreVal0), + emit("if "), + case Constr of + {Min,Max} -> + emit([{asis,Min}," =< ",PreVal,", ", + PreVal," =< ",{asis,Max}]); + Sv when is_integer(Sv) -> + emit([PreVal," =:= ",{asis,Sv}]) + end, + emit([" ->",nl]), + ReturnVal(fun() -> emit(PreVal0) end), + emit([";",nl, + "true ->",nl, + "exit({error,{asn1,bad_range}})",nl, + "end",nl, + "end"]) + end. %% Object code generating for encoding and decoding %% ------------------------------------------------ diff --git a/lib/asn1/src/asn1rtt_ber.erl b/lib/asn1/src/asn1rtt_ber.erl index 4bd814769f..c65e7dea11 100644 --- a/lib/asn1/src/asn1rtt_ber.erl +++ b/lib/asn1/src/asn1rtt_ber.erl @@ -26,25 +26,25 @@ skip_ExtensionAdditions/2]). -export([encode_boolean/2,decode_boolean/2, encode_integer/2,encode_integer/3, - decode_integer/2,decode_integer/3, - decode_named_integer/3,decode_named_integer/4, + decode_integer/2, + number2name/2, encode_enumerated/2,decode_enumerated/3, encode_unnamed_bit_string/2,encode_unnamed_bit_string/3, encode_named_bit_string/3,encode_named_bit_string/4, encode_bit_string/4, decode_named_bit_string/3, - decode_compact_bit_string/3, - decode_legacy_bit_string/3, - decode_native_bit_string/3, + decode_compact_bit_string/2,compact_bit_string_size/1, + decode_native_bit_string/2, + native_to_legacy_bit_string/1, encode_null/2,decode_null/2, encode_relative_oid/2,decode_relative_oid/2, encode_object_identifier/2,decode_object_identifier/2, encode_restricted_string/2, - decode_octet_string/2,decode_octet_string/3, - decode_restricted_string/2,decode_restricted_string/3, - encode_universal_string/2,decode_universal_string/3, + decode_octet_string/2, + decode_restricted_string/2, + encode_universal_string/2,decode_universal_string/2, encode_UTF8_string/2,decode_UTF8_string/2, - encode_BMP_string/2,decode_BMP_string/3]). + encode_BMP_string/2,decode_BMP_string/2]). -export([encode_open_type/2,decode_open_type/2, decode_open_type_as_binary/2]). @@ -697,41 +697,17 @@ encode_integer_neg(N, Acc) -> %%=============================================================================== %% decode integer -%% (Buffer, Range, HasTag, TotalLen) -> {Integer, Remain, RemovedBytes} -%% (Buffer, Range, NamedNumberList, HasTag, TotalLen) -> {Integer, Remain, RemovedBytes} %%=============================================================================== -decode_named_integer(Tlv, NamedNumberList, TagIn) -> - V = match_tags(Tlv, TagIn), - Int = decode_integer(V), - number2name(Int, NamedNumberList). - -decode_named_integer(Tlv, Range, NamedNumberList, TagIn) -> - V = match_tags(Tlv, TagIn), - Int = range_check_integer(decode_integer(V), Range), - number2name(Int, NamedNumberList). - decode_integer(Tlv, TagIn) -> V = match_tags(Tlv, TagIn), decode_integer(V). -decode_integer(Tlv, Range, TagIn) -> - V = match_tags(Tlv, TagIn), - Int = decode_integer(V), - range_check_integer(Int, Range). - decode_integer(Bin) -> Len = byte_size(Bin), <<Int:Len/signed-unit:8>> = Bin, Int. -range_check_integer(Int, {Lb,Ub}) when Lb =< Int, Int =< Ub -> - Int; -range_check_integer(Int, Range) -> - exit({error,{asn1,{integer_range,Range,Int}}}). - -number2name(Int, []) -> - Int; number2name(Int, NamedNumberList) -> case lists:keyfind(Int, 2, NamedNumberList) of {NamedVal,_} -> @@ -1098,33 +1074,23 @@ unused_bitlist([Bit | Rest], Trail, Ack) -> %% decode bitstring value %%============================================================================ -decode_compact_bit_string(Buffer, Range, Tags) -> +decode_compact_bit_string(Buffer, Tags) -> case match_and_collect(Buffer, Tags) of - <<0>> -> - check_restricted_string({0,<<>>}, 0, Range); - <<Unused,Bits/binary>> -> - Val = {Unused,Bits}, - Len = bit_size(Bits) - Unused, - check_restricted_string(Val, Len, Range) + <<0>> -> {0,<<>>}; + <<Unused,Bits/binary>> -> {Unused,Bits} end. -decode_legacy_bit_string(Buffer, Range, Tags) -> - Val = case match_and_collect(Buffer, Tags) of - <<0>> -> - []; - <<Unused,Bits/binary>> -> - decode_bitstring2(byte_size(Bits), Unused, Bits) - end, - check_restricted_string(Val, length(Val), Range). +compact_bit_string_size({Unused,Bits}) -> + bit_size(Bits) - Unused. -decode_native_bit_string(Buffer, Range, Tags) -> +decode_native_bit_string(Buffer, Tags) -> case match_and_collect(Buffer, Tags) of <<0>> -> - check_restricted_string(<<>>, 0, Range); + <<>>; <<Unused,Bits/binary>> -> Size = bit_size(Bits) - Unused, <<Val:Size/bitstring,_:Unused/bitstring>> = Bits, - check_restricted_string(Val, Size, Range) + Val end. decode_named_bit_string(Buffer, NamedNumberList, Tags) -> @@ -1147,6 +1113,9 @@ decode_bitstring2(Len, Unused, [B7,B6,B5,B4,B3,B2,B1,B0| decode_bitstring2(Len - 1, Unused, Buffer)]. +native_to_legacy_bit_string(Bits) -> + [B || <<B:1>> <= Bits]. + %%---------------------------------------- %% Decode the bitlist to names %%---------------------------------------- @@ -1310,31 +1279,12 @@ decode_octet_string(Tlv, TagsIn) -> Bin = match_and_collect(Tlv, TagsIn), binary:copy(Bin). -decode_octet_string(Tlv, Range, TagsIn) -> - Bin0 = match_and_collect(Tlv, TagsIn), - Bin = binary:copy(Bin0), - check_restricted_string(Bin, byte_size(Bin), Range). - %%============================================================================ %% decode Numeric Printable Teletex Videotex Visible IA5 Graphic General strings %%============================================================================ decode_restricted_string(Tlv, TagsIn) -> - Bin = match_and_collect(Tlv, TagsIn), - binary_to_list(Bin). - -decode_restricted_string(Tlv, Range, TagsIn) -> - Bin = match_and_collect(Tlv, TagsIn), - check_restricted_string(binary_to_list(Bin), byte_size(Bin), Range). - -check_restricted_string(Val, _Len, []) -> - Val; -check_restricted_string(Val, Len, {Lb,Ub}) when Lb =< Len, Len =< Ub -> - Val; -check_restricted_string(Val, Len, Len) -> - Val; -check_restricted_string(Val, _Len, Range) -> - exit({error,{asn1,{length,Range,Val}}}). + match_and_collect(Tlv, TagsIn). %%============================================================================ %% encode Universal string @@ -1360,10 +1310,9 @@ mk_uni_list([H|T],List) -> %% {String, Remain, RemovedBytes} %%=========================================================================== -decode_universal_string(Buffer, Range, Tags) -> +decode_universal_string(Buffer, Tags) -> Bin = match_and_collect(Buffer, Tags), - Val = mk_universal_string(binary_to_list(Bin)), - check_restricted_string(Val, length(Val), Range). + mk_universal_string(binary_to_list(Bin)). mk_universal_string(In) -> mk_universal_string(In, []). @@ -1423,10 +1372,9 @@ mk_BMP_list([H|T], List) -> %% (Buffer, Range, StringType, HasTag, TotalLen) -> %% {String, Remain, RemovedBytes} %%============================================================================ -decode_BMP_string(Buffer, Range, Tags) -> +decode_BMP_string(Buffer, Tags) -> Bin = match_and_collect(Buffer, Tags), - Val = mk_BMP_string(binary_to_list(Bin)), - check_restricted_string(Val, length(Val), Range). + mk_BMP_string(binary_to_list(Bin)). mk_BMP_string(In) -> mk_BMP_string(In,[]). |