Rewrite the code for testing DEFAULT for DER

The old code for testing DEFAULT values is messy, inefficient, and
causes dialyzer warnings.

1 files changed, 271 insertions, 0 deletions

diff --git a/lib/asn1/src/asn1ct_gen_check.erl b/lib/asn1/src/asn1ct_gen_check.erl
new file mode 100644
index 0000000000..d80a02dfbf
--- /dev/null
+++ b/lib/asn1/src/asn1ct_gen_check.erl
@@ -0,0 +1,271 @@
+%% vim: tabstop=8:shiftwidth=4
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2014. All Rights Reserved.
+%%
+%% The contents of this file are subject to the Erlang Public License,
+%% Version 1.1, (the "License"); you may not use this file except in
+%% compliance with the License. You should have received a copy of the
+%% Erlang Public License along with this software. If not, it can be
+%% retrieved online at http://www.erlang.org/.
+%%
+%% Software distributed under the License is distributed on an "AS IS"
+%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+%% the License for the specific language governing rights and limitations
+%% under the License.
+%%
+%% %CopyrightEnd%
+%%
+%%
+
+-module(asn1ct_gen_check).
+-export([emit/3]).
+
+-import(asn1ct_gen, [emit/1]).
+-include("asn1_records.hrl").
+
+emit(Type, Default, Value) ->
+    Key = {Type,Default},
+    Gen = fun(Fd, Name) ->
+		  file:write(Fd, gen(Name, Type, Default))
+	  end,
+    emit(" case "),
+    asn1ct_func:call_gen("is_default_", Key, Gen, [Value]),
+    emit([" of",nl,
+	  "true -> {[],0};",nl,
+	  "false ->",nl]).
+
+gen(Name, #type{def=T}, Default) ->
+    NameStr = atom_to_list(Name),
+    [NameStr,"(asn1_DEFAULT) ->\n",
+     "true;\n"|case do_gen(T, Default) of
+		   {literal,Literal} ->
+		       [NameStr,"(",term2str(Literal),") ->\n","true;\n",
+			NameStr,"(_) ->\n","false.\n\n"];
+		   {exception,Func,Args} ->
+		       [NameStr,"(Value) ->\n",
+			"try ",Func,"(Value",arg2str(Args),") of\n",
+			"_ -> true\n"
+			"catch throw:false -> false\n"
+			"end.\n\n"]
+	       end].
+
+do_gen(_, asn1_NOVALUE) ->
+    {literal,asn1_NOVALUE};
+do_gen(#'Externaltypereference'{module=M,type=T}, Default) ->
+    #typedef{typespec=#type{def=Td}} = asn1_db:dbget(M, T),
+    do_gen(Td, Default);
+do_gen('BOOLEAN', Default) ->
+    {literal,Default};
+do_gen({'BIT STRING',[]}, Default) ->
+    true = is_bitstring(Default),		%Assertion.
+    case asn1ct:use_legacy_types() of
+	false ->
+	    {literal,Default};
+	true ->
+	    {exception,need(check_legacy_bitstring, 2),[Default]}
+    end;
+do_gen({'BIT STRING',[_|_]=NBL}, Default) ->
+    do_named_bitstring(NBL, Default);
+do_gen({'ENUMERATED',_}, Default) ->
+    {literal,Default};
+do_gen('INTEGER', Default) ->
+    {literal,Default};
+do_gen({'INTEGER',NNL}, Default) ->
+    {exception,need(check_int, 3),[Default,NNL]};
+do_gen('NULL', Default) ->
+    {literal,Default};
+do_gen('OCTET STRING', Default) ->
+    true = is_binary(Default),			%Assertion.
+    case asn1ct:use_legacy_types() of
+	false ->
+	    {literal,Default};
+	true ->
+	    {exception,need(check_octetstring, 2),[Default]}
+    end;
+do_gen('OBJECT IDENTIFIER', Default0) ->
+    Default = pre_process_oid(Default0),
+    {exception,need(check_objectidentifier, 2),[Default]};
+do_gen({'CHOICE',Cs}, Default) ->
+    {Tag,Value} = Default,
+    [Type] = [Type || #'ComponentType'{name=T,typespec=Type} <- Cs,
+		      T =:= Tag],
+    case do_gen(Type#type.def, Value) of
+	{literal,Lit} ->
+	    {literal,{Tag,Lit}};
+	{exception,Func0,Args} ->
+	    Key = {Tag,Func0,Args},
+	    Gen = fun(Fd, Name) ->
+			  S = gen_choice(Name, Tag, Func0, Args),
+			  ok = file:write(Fd, S)
+		  end,
+	    Func = asn1ct_func:call_gen("is_default_choice", Key, Gen),
+	    {exception,atom_to_list(Func),[]}
+    end;
+do_gen(#'SEQUENCE'{components=Cs}, Default) ->
+    do_seq_set(Cs, Default);
+do_gen({'SEQUENCE OF',Type}, Default) ->
+    do_sof(Type, Default);
+do_gen(#'SET'{components=Cs}, Default) ->
+    do_seq_set(Cs, Default);
+do_gen({'SET OF',Type}, Default) ->
+    do_sof(Type, Default);
+do_gen(Type, Default) ->
+    case asn1ct_gen:unify_if_string(Type) of
+	restrictedstring ->
+	    {exception,need(check_restrictedstring, 2),[Default]};
+	_ ->
+	    %% Open type. Do our best.
+	    {literal,Default}
+    end.
+
+do_named_bitstring(NBL, Default0) when is_list(Default0) ->
+    Default = lists:sort(Default0),
+    Bs = asn1ct_gen:named_bitstring_value(Default, NBL),
+    Func = case asn1ct:use_legacy_types() of
+	       false -> check_named_bitstring;
+	       true -> check_legacy_named_bitstring
+	   end,
+    {exception,need(Func, 4),[Default,Bs,bit_size(Bs)]};
+do_named_bitstring(_, Default) when is_bitstring(Default) ->
+    Func = case asn1ct:use_legacy_types() of
+	       false -> check_named_bitstring;
+	       true -> check_legacy_named_bitstring
+	   end,
+    {exception,need(Func, 3),[Default,bit_size(Default)]}.
+
+do_seq_set(Cs0, Default) ->
+    Tag = element(1, Default),
+    Cs1 = [T || #'ComponentType'{typespec=T} <- Cs0],
+    Cs = components(Cs1, tl(tuple_to_list(Default))),
+    case are_all_literals(Cs) of
+	true ->
+	    Literal = list_to_tuple([Tag|[L || {literal,L} <- Cs]]),
+	    {literal,Literal};
+	false ->
+	    Key = {Cs,Default},
+	    Gen = fun(Fd, Name) ->
+			  S = gen_components(Name, Tag, Cs),
+			  ok = file:write(Fd, S)
+		  end,
+	    Func = asn1ct_func:call_gen("is_default_cs_", Key, Gen),
+	    {exception,atom_to_list(Func),[]}
+    end.
+
+do_sof(Type, Default0) ->
+    Default = lists:sort(Default0),
+    Cs0 = lists:duplicate(length(Default), Type),
+    Cs = components(Cs0, Default),
+    case are_all_literals(Cs) of
+	true ->
+	    Literal = [Lit || {literal,Lit} <- Cs],
+	    {exception,need(check_literal_sof, 2),[Literal]};
+	false ->
+	    Key = Cs,
+	    Gen = fun(Fd, Name) ->
+			  S = gen_sof(Name, Cs),
+			  ok = file:write(Fd, S)
+		  end,
+	    Func = asn1ct_func:call_gen("is_default_sof", Key, Gen),
+	    {exception,atom_to_list(Func),[]}
+    end.
+
+are_all_literals([{literal,_}|T]) ->
+    are_all_literals(T);
+are_all_literals([_|_]) ->
+    false;
+are_all_literals([]) -> true.
+
+gen_components(Name, Tag, Cs) ->
+    [atom_to_list(Name),"(Value) ->\n",
+     "case Value of\n",
+     "{",term2str(Tag)|gen_cs_1(Cs, 1, [])].
+
+gen_cs_1([{literal,Lit}|T], I, Acc) ->
+    [",\n",term2str(Lit)|gen_cs_1(T, I, Acc)];
+gen_cs_1([H|T], I, Acc) ->
+    Var = "E"++integer_to_list(I),
+    [",\n",Var|gen_cs_1(T, I+1, [{Var,H}|Acc])];
+gen_cs_1([], _, Acc) ->
+    ["} ->\n"|gen_cs_2(Acc, "")].
+
+gen_cs_2([{Var,{exception,Func,Args}}|T], Sep) ->
+    [Sep,Func,"(",Var,arg2str(Args),")"|gen_cs_2(T, ",\n")];
+gen_cs_2([], _) ->
+    [";\n",
+     "_ ->\n"
+     "throw(false)\n"
+     "end.\n"].
+
+gen_sof(Name, Cs) ->
+    [atom_to_list(Name),"(Value) ->\n",
+     "case length(Value) of\n",
+     integer_to_list(length(Cs))," -> ok;\n"
+     "_ -> throw(false)\n"
+     "end,\n"
+     "T0 = lists:sort(Value)"|gen_sof_1(Cs, 1)].
+
+gen_sof_1([{exception,Func,Args}|Cs], I) ->
+    NumStr = integer_to_list(I),
+    H = "H" ++ NumStr,
+    T = "T" ++ NumStr,
+    Prev = "T" ++ integer_to_list(I-1),
+    [",\n",
+     "[",H,case Cs of
+	       [] -> [];
+	       [_|_] -> ["|",T]
+	   end,"] = ",Prev,",\n",
+     Func,"(",H,arg2str(Args),")"|gen_sof_1(Cs, I+1)];
+gen_sof_1([], _) ->
+    ".\n".
+
+components([#type{def=Def}|Ts], [V|Vs]) ->
+    [do_gen(Def, V)|components(Ts, Vs)];
+components([], []) -> [].
+
+gen_choice(Name, Tag, Func, Args) ->
+    NameStr = atom_to_list(Name),
+    [NameStr,"({",term2str(Tag),",Value}) ->\n"
+     " ",Func,"(Value",arg2str(Args),");\n",
+     NameStr,"(_) ->\n"
+     " throw(false).\n"].
+
+pre_process_oid(Oid) ->
+    Reserved = reserved_oid(),
+    pre_process_oid(tuple_to_list(Oid), Reserved, []).
+
+pre_process_oid([H|T]=Tail, Res0, Acc) ->
+    case lists:keyfind(H, 2, Res0) of
+	false ->
+	    {lists:reverse(Acc),Tail};
+	{Names0,H,Res} ->
+	    Names = case is_list(Names0) of
+			false -> [Names0];
+			true -> Names0
+		    end,
+	    Keys = [H|Names],
+	    pre_process_oid(T, Res, [Keys|Acc])
+    end.
+
+reserved_oid() ->
+    [{['itu-t',ccitt],0,
+      [{recommendation,0,[]},
+       {question,1,[]},
+       {administration,2,[]},
+       {'network-operator',3,[]},
+       {'identified-organization',4,[]}]},
+     {iso,1,[{standard,0,[]},
+	     {'member-body',2,[]},
+	     {'identified-organization',3,[]}]},
+     {['joint-iso-itu-t','joint-iso-ccitt'],2,[]}].
+
+arg2str(Args) ->
+    [", "++term2str(Arg) || Arg <- Args].
+
+term2str(T) ->
+    io_lib:format("~w", [T]).
+
+need(F, A) ->
+    asn1ct_func:need({check,F,A}),
+    atom_to_list(F).