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-rw-r--r--lib/asn1/src/asn1ct_constructed_per.erl160
1 files changed, 116 insertions, 44 deletions
diff --git a/lib/asn1/src/asn1ct_constructed_per.erl b/lib/asn1/src/asn1ct_constructed_per.erl
index 7fc904ec16..c3067e53be 100644
--- a/lib/asn1/src/asn1ct_constructed_per.erl
+++ b/lib/asn1/src/asn1ct_constructed_per.erl
@@ -1322,8 +1322,7 @@ gen_dec_component_no_val({ext,_,_},mandatory) ->
emit({"asn1_NOVALUE"}).
-gen_dec_choice_line(Erule, TopType, Comp, Pos, Ext) ->
- Pre = gen_dec_line_open_type(Erule, Ext, Pos),
+gen_dec_choice_line(Erule, TopType, Comp, Pre) ->
Imm0 = gen_dec_line_imm(Erule, TopType, Comp, false, Pre),
Init = {ignore,fun(_) -> {[],[]} end},
Imm = [{group,[Init|Imm0]}],
@@ -1638,62 +1637,135 @@ gen_enc_choice2(Erule, TopType, [H|T], Pos, Sep0, Ext) ->
gen_enc_choice2(Erule, TopType, T, Pos+1, Sep, Ext);
gen_enc_choice2(_, _, [], _, _, _) -> ok.
-gen_dec_choice(Erule,TopType,CompList,{ext,Pos,NumExt}) ->
- emit(["{Ext,",{curr,bytes},"} = ",
- {call,Erule,getbit,["Bytes"]},com,nl]),
+%% Generate the code for CHOICE. If the CHOICE is extensible,
+%% the structure of the generated code is as follows:
+%%
+%% case Bytes of
+%% <<0:1,Bytes1/bitstring>> ->
+%% Choice = <Decode INTEGER (0..LastRootChoice) from Bytes1>
+%% case Choice of
+%% 0 -> <Decode>;
+%% :
+%% LastRootChoice -> <Decode>
+%% end;
+%% <<1:1,Bytes1/bitstring>> ->
+%% Choice = <Decode normally small number from Bytes1>
+%% TmpVal = <Decode open type>
+%% case Choice of
+%% 0 -> <Decode TmpVal>;
+%% :
+%% LastExtension -> <Decode TmpVal>;
+%% _ -> <Return TmpVal since the type is unknown>
+%% end
+%% end
+%%
+%% The return value from the generated function always looks like:
+%% {{ChoiceTag,Value},RemainingBuffer}
+%% where ChoiceTag will be 'asn1_ExtAlt' for an unknown extension.
+%%
+%% If the CHOICE is not extensible, the top-level case is omitted
+%% and only the code in the first case arm is generated.
+
+gen_dec_choice(Erule, TopType, CompList, {ext,_,_}=Ext) ->
+ {RootList,ExtList} = split_complist(CompList),
+ emit(["case Bytes of",nl]),
+ case RootList of
+ [] ->
+ ok;
+ [_|_] ->
+ emit(["<<0:1,Bytes1/bitstring>> ->",nl]),
+ asn1ct_name:new(bytes),
+ gen_dec_choice1(Erule, TopType, RootList, noext),
+ emit([";",nl,nl])
+ end,
+ emit(["<<1:1,Bytes1/bitstring>> ->",nl]),
+ asn1ct_name:clear(),
+ asn1ct_name:new(bytes),
asn1ct_name:new(bytes),
- gen_dec_choice1(Erule,TopType,CompList,{ext,Pos,NumExt});
-gen_dec_choice(Erule,TopType,CompList,noext) ->
- gen_dec_choice1(Erule,TopType,CompList,noext).
-
-gen_dec_choice1(Erule,TopType,CompList,noext) ->
- emit(["{Choice,",{curr,bytes},
- "} = ",{call,Erule,getchoice,
- [{prev,bytes},length(CompList),"0"]},com,nl,
- "{Cname,{Val,NewBytes}} = case Choice of",nl]),
- gen_dec_choice2(Erule,TopType,CompList,noext),
- emit({nl,"end,",nl}),
- emit({nl,"{{Cname,Val},NewBytes}"});
-gen_dec_choice1(Erule,TopType,{RootList,ExtList},Ext) ->
- NewList = RootList ++ ExtList,
- gen_dec_choice1(Erule,TopType, NewList, Ext);
-gen_dec_choice1(Erule,TopType,{RootList,ExtList,RootList2},Ext) ->
- NewList = RootList ++ RootList2 ++ ExtList,
- gen_dec_choice1(Erule,TopType, NewList, Ext);
-gen_dec_choice1(Erule,TopType,CompList,{ext,ExtPos,ExtNum}) ->
- emit(["{Choice,",{curr,bytes},"} = ",
- {call,Erule,getchoice,
- [{prev,bytes},length(CompList)-ExtNum,"Ext"]},com,nl]),
- emit({"{Cname,{Val,NewBytes}} = case Choice + Ext*",ExtPos-1," of",nl}),
- gen_dec_choice2(Erule,TopType,CompList,{ext,ExtPos,ExtNum}),
+ gen_dec_choice1(Erule, TopType, ExtList, Ext),
+ emit([nl,"end"]);
+gen_dec_choice(Erule, TopType, CompList, noext) ->
+ gen_dec_choice1(Erule, TopType, CompList, noext).
+
+split_complist({Root1,Ext,Root2}) ->
+ {Root1++Root2,Ext};
+split_complist({_,_}=CompList) ->
+ CompList.
+
+gen_dec_choice1(Erule, TopType, CompList, noext=Ext) ->
+ emit_getchoice(Erule, CompList, Ext),
+ emit(["case Choice of",nl]),
+ Pre = {safe,fun(St) ->
+ {asn1ct_gen:mk_var(asn1ct_name:curr(bytes)),
+ fun() -> St end}
+ end},
+ gen_dec_choice2(Erule, TopType, CompList, Pre),
+ emit([nl,"end"]);
+gen_dec_choice1(Erule, TopType, CompList, {ext,_,_}=Ext) ->
+ emit_getchoice(Erule, CompList, Ext),
Imm = asn1ct_imm:per_dec_open_type(is_aligned(Erule)),
+ emit(["begin",nl]),
BytesVar = asn1ct_gen:mk_var(asn1ct_name:curr(bytes)),
- emit([";",nl,
- "_ ->",nl]),
- {TmpTerm,TmpBuf} = asn1ct_imm:dec_slim_cg(Imm, BytesVar),
- emit([com,nl,
- "{asn1_ExtAlt,{",TmpTerm,com,TmpBuf,"}}",nl,
- "end,",nl,nl,
- "{{Cname,Val},NewBytes}"]).
-
+ {Dst,DstBuf} = asn1ct_imm:dec_slim_cg(Imm, BytesVar),
+ emit([nl,
+ "end,",nl,
+ "case Choice of",nl]),
+ Pre = {safe,fun(St) ->
+ emit(["{TmpVal,_} = "]),
+ {Dst,
+ fun() ->
+ emit([",",nl,
+ "{TmpVal,",DstBuf,"}"]),
+ St
+ end}
+ end},
+ gen_dec_choice2(Erule, TopType, CompList, Pre),
+ case CompList of
+ [] -> ok;
+ [_|_] -> emit([";",nl])
+ end,
+ emit(["_ ->",nl,
+ "{{asn1_ExtAlt,",Dst,"},",DstBuf,"}",nl,
+ "end"]).
+
+emit_getchoice(Erule, CompList, Ext) ->
+ Al = is_aligned(Erule),
+ Imm = case {Ext,CompList} of
+ {noext,[_]} ->
+ {value,0};
+ {noext,_} ->
+ asn1ct_imm:per_dec_constrained(0, length(CompList)-1, Al);
+ {{ext,_,_},_} ->
+ asn1ct_imm:per_dec_normally_small_number(Al)
+ end,
+ emit(["{Choice,",{curr,bytes},"} = ",nl]),
+ BytesVar = asn1ct_gen:mk_var(asn1ct_name:prev(bytes)),
+ asn1ct_imm:dec_code_gen(Imm, BytesVar),
+ emit([com,nl]).
gen_dec_choice2(Erule,TopType,L,Ext) ->
gen_dec_choice2(Erule, TopType, L, 0, [], Ext).
-gen_dec_choice2(Erule, TopType, [H0|T], Pos, Sep0, Ext) ->
+gen_dec_choice2(Erule, TopType, [H0|T], Pos, Sep0, Pre) ->
#'ComponentType'{name=Cname,typespec=Type} = H0,
H = H0#'ComponentType'{prop=mandatory},
+ emit([Sep0,Pos," ->",nl]),
case Type#type.def of
#'ObjectClassFieldType'{type={typefield,_}} ->
- emit([Sep0,Pos," ->",nl]),
- gen_dec_choice_line(Erule, TopType, H, Pos+1, Ext);
+ emit("{Cname,{Val,NewBytes}} = begin\n"),
+ gen_dec_choice_line(Erule, TopType, H, Pre),
+ emit([nl,
+ "end,",nl,
+ "{{Cname,Val},NewBytes}"]);
_ ->
- emit([Sep0,Pos," -> {",{asis,Cname},",",nl]),
- gen_dec_choice_line(Erule, TopType, H, Pos+1, Ext),
- emit("}")
+ emit("{Val,NewBytes} = begin\n"),
+ gen_dec_choice_line(Erule, TopType, H, Pre),
+ emit([nl,
+ "end,",nl,
+ "{{",{asis,Cname},",Val},NewBytes}"])
end,
Sep = [";",nl],
- gen_dec_choice2(Erule, TopType, T, Pos+1, Sep, Ext);
+ gen_dec_choice2(Erule, TopType, T, Pos+1, Sep, Pre);
gen_dec_choice2(_, _, [], _, _, _) -> ok.
indent(N) ->
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-08 05:15:23 +0000