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410 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- GNAT.Sockets.Connection_State_Machine. Luebeck --
-- ASN1.Indefinite_Unsigned Spring, 2019 --
-- Implementation --
-- Last revision : 10:13 29 Nov 2020 --
-- --
-- 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 GNAT.Sockets.Connection_State_Machine.ASN1.Lengths;
use GNAT.Sockets.Connection_State_Machine.ASN1.Lengths;
with System.Address_To_Access_Conversions;
package body GNAT.Sockets.Connection_State_Machine.
ASN1.Indefinite_Unsigneds is
pragma Assert (Character'Size = Stream_Element'Size);
procedure Uninitialized (Item : ASN1_Data_Item'Class) is
begin
Raise_Exception
( Use_Error'Identity,
( "ASN.1 indefinite unsigned "
& Expanded_Name (Item'Tag)
& " was not properly initialized"
) );
end Uninitialized;
procedure Encode
( Item : Implicit_Indefinite_Unsigned_Data_Item;
Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - Data'Last /= 1
) ) then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
declare
Content : Stream_Element_Array
( 1
.. Stream_Element_Count (Item.Length)
);
pragma Import (Ada, Content);
for Content'Address use
Item.Buffer.Buffer (Item.Start)'Address;
begin
Put (Data, Pointer, Content);
end;
end Encode;
procedure Explicit_Encode is
new Generic_Explicit_Encode
( Implicit_Indefinite_Unsigned_Data_Item
);
procedure Encode
( Item : Indefinite_Unsigned_Data_Item;
Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
Explicit_Encode
( Implicit_Indefinite_Unsigned_Data_Item (Item),
Data,
Pointer
);
end Encode;
procedure Enumerate
( Stream : access Root_Stream_Type'Class;
Item : Implicit_Indefinite_Unsigned_Data_Item
) is
procedure Find
( Object : in out
Implicit_Indefinite_Unsigned_Data_Item'Class;
Shared : Shared_Data_Item_Ptr
) is
This : Shared_Data_Item_Ptr := Shared;
begin
loop
if This = null then
Raise_Exception
( Use_Error'Identity,
( "Missing buffer for externally buffered "
& "ASN.1 indefinite unsigned"
) );
end if;
exit when This.all in External_String_Buffer'Class;
This := This.Previous;
end loop;
Object.Buffer :=
External_String_Buffer'Class (This.all)'Unchecked_Access;
end Find;
begin
Check_Initialization_Stream (Item, Stream.all);
declare
This : Initialization_Stream'Class renames
Initialization_Stream'Class (Stream.all);
begin
if Item.Buffer = null then
if This.Parent = null then
Find (Self (Item).all, This.Shared);
else
Find (Self (Item).all, This.Parent.all);
end if;
end if;
Enumerate (Stream, ASN1_Data_Item (Item));
end;
end Enumerate;
procedure Feed
( Item : in out Indefinite_Unsigned_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
Check (Data (Pointer), (1 => Integer_Tag), True);
Pointer := Pointer + 1;
Item.Start := Item.Buffer.Length + 1;
Item.Length := 0;
State := Start_Length;
if Pointer > Data'Last then
return;
end if;
end if;
if State < 0 then
while not Is_Length_Ready (State) loop
if Pointer > Data'Last then
return;
end if;
Embedded_Feed (Data, Pointer, State);
end loop;
if Is_Indefinite (State) then
Raise_Exception (Data_Error'Identity, Invalid_Length);
end if;
State := Get_Length (State);
if State = 0 then
Raise_Exception (Data_Error'Identity, Invalid_Length);
end if;
Item.Length := 0;
Item.Start := Item.Buffer.Length + 1;
if Pointer > Data'Last then
return;
end if;
end if;
Feed
( Item => Implicit_Indefinite_Unsigned_Data_Item (Item),
Data => Data,
Pointer => Pointer,
Client => Client,
State => State
);
end Feed;
procedure Feed
( Item : in out Implicit_Indefinite_Unsigned_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
if Item.Length = 0 then
Raise_Exception (Data_Error'Identity, Invalid_Length);
end if;
State := Stream_Element_Offset (Item.Length);
Item.Start := Item.Buffer.Length + 1;
Item.Length := 0;
if Pointer > Data'Last then
return;
end if;
end if;
while Pointer <= Data'Last loop
if Item.Buffer.Length >= Item.Buffer.Size then
Raise_Exception (Storage_Error'Identity, Too_Large);
end if;
Item.Buffer.Length := Item.Buffer.Length + 1;
Item.Buffer.Buffer (Item.Buffer.Length) :=
Character'Val (Data (Pointer));
State := State - 1;
Pointer := Pointer + 1;
Item.Length := Item.Length + 1;
exit when State = 0;
end loop;
end Feed;
procedure Get
( Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : out Stream_Element_Array
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - Data'Last /= 1
) ) then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
elsif Data'Last - Pointer < Value'Length - 1 then
Raise_Exception (End_Error'Identity, Non_Terminated);
else
Value := Data (Pointer..Pointer + Value'Length - 1);
Pointer := Pointer + Value'Length;
end if;
end Get;
function Get_ASN1_Type
( Item : Implicit_Indefinite_Unsigned_Data_Item
) return ASN1_Type is
begin
return Integer_Tag;
end Get_ASN1_Type;
function Get_Buffer
( Item : Implicit_Indefinite_Unsigned_Data_Item
) return External_String_Buffer_Ptr is
begin
return Item.Buffer;
end Get_Buffer;
function Get_Length
( Item : Implicit_Indefinite_Unsigned_Data_Item
) return Natural is
begin
return Item.Length;
end Get_Length;
function Get_Value
( Item : Implicit_Indefinite_Unsigned_Data_Item
) return Stream_Element_Array is
begin
if Item.Buffer = null then
return (1..0 => 0);
else
declare
Content : Stream_Element_Array
( 1
.. Stream_Element_Count (Item.Length)
);
pragma Import (Ada, Content);
for Content'Address use
Item.Buffer.Buffer (Item.Start)'Address;
begin
return Content;
end;
end if;
end Get_Value;
function Is_Implicit (Item : Indefinite_Unsigned_Data_Item)
return Boolean is
begin
return False;
end Is_Implicit;
function Is_Implicit (Item : Implicit_Indefinite_Unsigned_Data_Item)
return Boolean is
begin
return True;
end Is_Implicit;
procedure Put_Unchecked
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Stream_Element_Array
) is
Length : Stream_Element_Offset := Value'Length;
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - Data'Last /= 1
) ) then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
if Value'Length = 0 or else Value (Value'First) > 127 then
Length := Length + 1;
end if;
if Data'Last - Pointer < Length - 1 then
Raise_Exception (End_Error'Identity, No_Room);
end if;
if Value'Length = 0 or else Value (Value'First) > 127 then
Data (Pointer) := 0; -- The higher-order bit is not 0
Pointer := Pointer + 1;
end if;
Data (Pointer..Pointer + Value'Length - 1) := Value;
Pointer := Pointer + Value'Length;
end Put_Unchecked;
procedure Put
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Stream_Element_Array
) is
begin
if Value'Length > 0 then
for Index in Value'Range loop
if Value (Index) /= 0 then
Put_Unchecked (Data, Pointer, Value (Index..Value'Last));
return;
end if;
end loop;
end if;
Put_Unchecked (Data, Pointer, (1..0 => 0));
end Put;
function Self
( Item : Implicit_Indefinite_Unsigned_Data_Item'Class
) return Implicit_Indefinite_Unsigned_Data_Item_Ptr is
package From_Address is
new System.Address_To_Access_Conversions
( Implicit_Indefinite_Unsigned_Data_Item'Class
);
use From_Address;
begin
return To_Pointer (Item'Address).all'Unchecked_Access;
end Self;
procedure Set_Implicit_Tag
( Item : in out Implicit_Indefinite_Unsigned_Data_Item;
Tag : Tag_Type;
Length : Stream_Element_Offset
) is
begin
if Length < 1 then
if Length < 0 then
Set_Implicit_Tag (ASN1_Data_Item (Item), Tag, Length);
else
Raise_Exception (Data_Error'Identity, Invalid_Length);
end if;
else
Item.Length := Natural (Length);
end if;
end Set_Implicit_Tag;
procedure Set_Value
( Item : in out Implicit_Indefinite_Unsigned_Data_Item;
Value : Stream_Element_Array
) is
begin
if Item.Buffer = null then
Uninitialized (Item);
end if;
declare
Buffer : String renames Item.Buffer.Buffer;
Length : Integer renames Item.Buffer.Length;
First : Stream_Element_Offset;
begin
Item.Start := Length + 1;
if Value'Length = 0 then
Item.Length := 0; -- Zero value
return;
end if;
First := Value'First;
while Value (First) = 0 loop
if First = Value'Last then
Item.Length := 0; -- Zero value
return;
end if;
First := First + 1;
end loop;
if ( Stream_Element_Offset
( Item.Buffer.Size
- Item.Buffer.Length
)
< Value'Last - First + 1
) then
Raise_Exception (Constraint_Error'Identity, Too_Large);
end if;
Item.Length := Integer (Value'Last - First + 1);
for Index in First..Value'Last loop
Buffer (Length) := Character'Val (Value (Index));
Length := Length + 1;
end loop;
end;
end Set_Value;
end GNAT.Sockets.Connection_State_Machine.ASN1.Indefinite_Unsigneds;
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