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273 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- GNAT.Sockets.Connection_State_Machine. Luebeck --
-- ASN1.Tagged_Values Spring, 2019 --
-- Implementation --
-- Last revision : 18:41 01 Aug 2019 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 of --
-- the License, or (at your option) any later version. This library --
-- is distributed in the hope that it will be useful, but WITHOUT --
-- ANY WARRANTY; without even the implied warranty of --
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with Ada.Exceptions; use Ada.Exceptions;
with Ada.IO_Exceptions; use Ada.IO_Exceptions;
with Ada.Tags; use Ada.Tags;
with Strings_Edit; use Strings_Edit;
with Strings_Edit.Integers; use Strings_Edit.Integers;
with GNAT.Sockets.Connection_State_Machine.ASN1.Choices;
use GNAT.Sockets.Connection_State_Machine.ASN1.Choices;
with Ada.Unchecked_Conversion;
with System.Address_To_Access_Conversions;
package body GNAT.Sockets.Connection_State_Machine.ASN1.Tagged_Values is
Invalid_EOC : constant String := "Invalid indefinite ASN.1 " &
"sequence termination";
Invalid_Length : constant String := "Invalid ASN.1 sequence length";
Wrong_Class : constant String := "Wrong ASN.1 value class";
Type_Error : constant String := "ASN.1 tag does not match " &
"the object type";
procedure Check (Item : Tagged_Data_Item) is
begin
if not Item.Initialized then
Raise_Exception
( Use_Error'Identity,
( "ASN.1 sequence "
& Expanded_Name (Data_Item'Class (Item)'Tag)
& " was not properly initialized"
) );
end if;
end Check;
function Always_Constructed (Item : Tagged_Data_Item)
return Boolean is
begin
Check (Item);
return Always_Constructed (Item.Value.all);
end Always_Constructed;
procedure Encode
( Item : Tagged_Data_Item;
Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
Index : Stream_Element_Offset := Pointer;
begin
Check (Item);
if Item.Tag.Class = Universal_Tag and then Item.Tag.Value = 0 then
declare
Selected : Abstract_ASN1_Data_Item'Class renames
Resolve_Selected (Item.Value.all).all;
begin
Put
( Data,
Index,
( Universal_Tag,
Get_ASN1_Type (ASN1_Data_Item'Class (Selected)),
False
),
Always_Constructed (Selected)
);
end;
else
Put
( Data,
Index,
Item.Tag,
( Always_Constructed (Item.Value.all)
or else
( Item.Tag.Class /= Universal_Tag
and then
not Is_Implicit (Item.Value.all)
) ) );
end if;
Definite_Encode (Item.Value.all, Data, Index);
Pointer := Index;
end Encode;
procedure Enumerate
( Stream : access Root_Stream_Type'Class;
Item : Tagged_Data_Item
) is
begin
Check_Initialization_Stream (Item, Stream.all);
declare
Count : Data_Item_Offset := 0;
This : Initialization_Stream'Class renames
Initialization_Stream'Class (Stream.all);
begin
if not Item.Initialized then
declare
Counter : aliased Initialization_Stream;
Object : Tagged_Data_Item'Class renames
Self (Item).all;
begin
if This.Parent = null then
Counter.Parent := This.Shared'Access;
else
Counter.Parent := This.Parent;
end if;
Object.Initialized := True;
Tagged_Data_Item'Class'Write
( Counter'Access,
Tagged_Data_Item'Class (Item)
);
if Counter.Count <= 1 then
Raise_Exception
( Use_Error'Identity,
( "ASN.1 tagged value "
& Expanded_Name
( Tagged_Data_Item'Class (Item)'Tag
)
& " contains no values"
) );
elsif Counter.Count > 2 then
Raise_Exception
( Use_Error'Identity,
( "ASN.1 tagged value "
& Expanded_Name
( Tagged_Data_Item'Class (Item)'Tag
)
& " contains more than one value"
) );
elsif Counter.Data.Vector (2).all not in
Abstract_ASN1_Data_Item'Class then
Raise_Exception
( Use_Error'Identity,
( "ASN.1 tagged value "
& Expanded_Name
( Counter.Data.Vector (2)'Tag
)
& " is not an ASN.1 object"
) );
end if;
Object.Value :=
Abstract_ASN1_Data_Item'Class
( Counter.Data.Vector (2).all
) 'Unchecked_Access;
Count := Data_Item_Offset (Get_Size (Item));
Initialized (Object);
end;
end if;
Add (This, Item, Count);
end;
end Enumerate;
procedure Feed
( Item : in out Tagged_Data_Item;
Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Client : in out State_Machine'Class;
State : in out Stream_Element_Offset
) is
begin
if State = 0 then
case ASN1_Tag (Data (Pointer)) and 2#1100_0000# is
when Application_Class =>
Item.Tag.Class := Application_Tag;
when Context_Specific_Class =>
Item.Tag.Class := Context_Specific_Tag;
when Private_Class =>
Item.Tag.Class := Private_Tag;
when others =>
Item.Tag.Class := Universal_Tag;
end case;
Item.Tag.Optional := False;
Item.Tag.Value := ASN1_Type (Data (Pointer) and 16#1F#);
Pointer := Pointer + 1;
if Item.Tag.Value < 31 then
Call
( Item => Item.Selected,
Callee => Item.Value.all,
Tag => Item.Tag,
Pointer => Pointer,
Client => Client,
State => State
);
State := 0;
return;
end if;
State := 1;
Item.Tag.Value := 0;
if Pointer > Data'Last then
return;
end if;
end if;
loop
begin
if Data (Pointer) > 127 then
Item.Tag.Value :=
( Item.Tag.Value * 128
+ (ASN1_Type (Data (Pointer)) - 128)
);
Pointer := Pointer + 1;
else
Item.Tag.Value :=
Item.Tag.Value * 128 + ASN1_Type (Data (Pointer));
Pointer := Pointer + 1;
Call
( Item => Item.Selected,
Callee => Item.Value.all,
Tag => Item.Tag,
Pointer => Pointer,
Client => Client,
State => State
);
State := 0;
return;
end if;
exception
when Constraint_Error =>
Raise_Exception (Data_Error'Identity, Tag_Too_Large);
end;
exit when Pointer > Data'Last;
end loop;
end Feed;
function Get_Size (Item : Tagged_Data_Item) return Natural is
begin
Check (Item);
return Get_Size (Item.Value.all);
end Get_Size;
procedure Initialized (Item : in out Tagged_Data_Item) is
begin
null;
end Initialized;
function Is_Implicit (Item : Tagged_Data_Item) return Boolean is
begin
return False;
end Is_Implicit;
function Self (Item : Tagged_Data_Item'Class)
return Tagged_Data_Item_Ptr is
package From_Sequence_Address is
new System.Address_To_Access_Conversions
( Tagged_Data_Item'Class
);
use From_Sequence_Address;
begin
return To_Pointer (Item'Address).all'Unchecked_Access;
end Self;
end GNAT.Sockets.Connection_State_Machine.ASN1.Tagged_Values;
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