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672 | -- --
-- package Copyright (c) Dmitry A. Kazakov --
-- GNAT.Sockets.Connection_State_Machine. Luebeck --
-- ASN1.Bit_Strings.Implicit Spring, 2019 --
-- Implementation --
-- Last revision : 13:37 03 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 GNAT.Sockets.Connection_State_Machine.ASN1.Lengths;
use GNAT.Sockets.Connection_State_Machine.ASN1.Lengths;
with Ada.Unchecked_Conversion;
with System.Address_To_Access_Conversions;
package body GNAT.Sockets.Connection_State_Machine.ASN1.Bit_Strings.
Implicit is
type Embedded_Length is mod 2**24;
type Unused_Bits is mod 8;
type Embedding_Mode is
( Bit_String_Body,
Unused_Bits_Count,
Bit_String_Type,
Length_Lookahead,
Null_Contents,
End_Of_Content
);
type Status_Type is record
Length : Embedded_Length;
Unused : Unused_Bits;
Mode : Embedding_Mode;
end record;
for Status_Type use record
Length at 0 range 0..23;
Unused at 0 range 24..26;
Mode at 0 range 27..29;
end record;
for Status_Type'Size use Unsigned_32'Size;
procedure Check_Length
( Item : Implicit_Bit_String_Data_Item;
Length : Natural
) is
begin
if Item.Size < Length then
Raise_Exception (Constraint_Error'Identity, Too_Large);
end if;
end Check_Length;
procedure Check_Length
( Item : Implicit_External_Bit_String_Data_Item;
Length : Natural
) is
begin
if ( Item.Buffer = null
or else
Item.Buffer.Size - Item.Buffer.Length < (Length + 7) / 8
) then
Raise_Exception (Storage_Error'Identity, Too_Large);
end if;
end Check_Length;
procedure Store
( Item : in out Implicit_Bit_String_Data_Item;
Bit : Boolean
) is
begin
Item.Length := Item.Length + 1;
Item.Value (Item.Length) := Bit;
end Store;
procedure Store
( Item : in out Implicit_Bit_String_Data_Item;
Byte : Stream_Element
) is
begin
Item.Value (Item.Length + 1..Item.Length + 8) :=
( 0 /= (Byte and 2#1000_0000#),
0 /= (Byte and 2#0100_0000#),
0 /= (Byte and 2#0010_0000#),
0 /= (Byte and 2#0001_0000#),
0 /= (Byte and 2#0000_1000#),
0 /= (Byte and 2#0000_0100#),
0 /= (Byte and 2#0000_0010#),
0 /= (Byte and 2#0000_0001#)
);
Item.Length := Item.Length + 8;
end Store;
procedure Store
( Item : in out Implicit_External_Bit_String_Data_Item;
Bit : Boolean
) is
begin
if Item.Length mod 8 = 0 then
Item.Buffer.Length := Item.Buffer.Length + 1;
Item.Buffer.Buffer (Item.Buffer.Length) := Character'Val (0);
end if;
if Bit then
declare
Octet : Character renames
Item.Buffer.Buffer (Item.Buffer.Length);
begin
Octet :=
Character'Val
( Character'Pos (Octet) + 2**(7 - Item.Length mod 8)
);
end;
end if;
Item.Length := Item.Length + 1;
end Store;
procedure Store
( Item : in out Implicit_External_Bit_String_Data_Item;
Byte : Stream_Element
) is
begin
Item.Buffer.Length := Item.Buffer.Length + 1;
Item.Buffer.Buffer (Item.Buffer.Length) := Character'Val (Byte);
Item.Length := Item.Length + 8;
end Store;
function From_State
( State : Stream_Element_Offset
) return Status_Type is
function Convert is
new Ada.Unchecked_Conversion (Unsigned_32, Status_Type);
begin
return Convert (Unsigned_32 (State));
end From_State;
function To_State
( Status : Status_Type
) return Stream_Element_Offset is
function Convert is
new Ada.Unchecked_Conversion (Status_Type, Unsigned_32);
begin
return Stream_Element_Offset (Convert (Status));
end To_State;
procedure Uninitialized (Item : ASN1_Data_Item'Class) is
begin
Raise_Exception
( Use_Error'Identity,
( "ASN.1 bit string "
& Expanded_Name (Item'Tag)
& " was not properly initialized"
) );
end Uninitialized;
procedure Explicit_Put is new Generic_Put (Boolean_Array);
procedure Encode
( Item : Implicit_Bit_String_Data_Item;
Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
Put (Data, Pointer, Item.Value (1..Item.Length));
end Encode;
procedure Encode
( Item : Implicit_External_Bit_String_Data_Item;
Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
Put (Data, Pointer, Get_Value (Item));
end Encode;
procedure Enumerate
( Stream : access Root_Stream_Type'Class;
Item : Implicit_External_Bit_String_Data_Item
) is
procedure Find
( Object : in out
Implicit_External_Bit_String_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 bit string"
) );
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 Generic_Feed
( Parent : in out Data_Item;
Item : in out Bit_String_Data;
Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Client : in out State_Machine'Class;
State : in out Stream_Element_Offset
) is
Status : Status_Type;
begin
if State = 0 then
if Item.Definite then
declare
Length : Stream_Element_Offset := Item.Last;
begin
if Item.Primitive then -- Primitive bit string
if Length = 0 then
Raise_Exception
( Data_Error'Identity,
Invalid_Length
);
end if;
Length := Length - 1;
if Length = 0 then
Status.Mode := End_Of_Content;
else
Status.Mode := Unused_Bits_Count;
Status.Unused := 0;
Status.Length := Embedded_Length (Length);
end if;
else -- The total length is here
Item.Last := Pointer + Length - 1;
Status.Mode := Bit_String_Type;
end if;
end;
else
if Item.Primitive then
Raise_Exception (Data_Error'Identity, Wrong_Length);
end if;
Item.Nested := True;
Status.Length := 0;
Status.Unused := 0;
Status.Mode := Bit_String_Type;
end if;
Item.Nested := True;
State := To_State (Status);
end if;
while Pointer <= Data'Last loop
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
if Item.Primitive then
Raise_Exception (Data_Error'Identity, Wrong_Length);
elsif Item.Nested then
Raise_Exception (Data_Error'Identity, Nested);
end if;
Item.Definite := False;
Item.Nested := True;
Status.Length := 0;
Status.Unused := 0;
Status.Mode := Bit_String_Type;
else
declare
Length : Stream_Element_Offset := Get_Length (State);
begin
if Item.Primitive then -- Primitive bit string
if Length = 0 then
Raise_Exception
( Data_Error'Identity,
Invalid_Length
);
end if;
Length := Length - 1;
if Length = 0 then
Status.Mode := End_Of_Content;
else
Status.Mode := Unused_Bits_Count;
Status.Unused := 0;
Status.Length := Embedded_Length (Length);
end if;
elsif Item.Nested then -- Constructor bit string
if Item.Definite and then Pointer > Item.Last then
Raise_Exception
( Data_Error'Identity,
"ASN.1 bit string data overrun"
);
elsif Length = 0 then
Raise_Exception
( Data_Error'Identity,
Invalid_Length
);
end if;
Length := Length - 1;
if Length = 0 then
Status.Mode := Null_Contents;
else
Status.Mode := Unused_Bits_Count;
Status.Unused := 0;
Status.Length := Embedded_Length (Length);
end if;
else -- Not nested, the total length is here
Item.Last := Pointer + Length - 1;
Item.Definite := True;
Item.Nested := True;
Status.Mode := Bit_String_Type;
end if;
end;
end if;
State := To_State (Status);
else
Status := From_State (State);
declare
Mask : Stream_Element;
Octet : Stream_Element;
begin
loop
case Status.Mode is
when Unused_Bits_Count =>
if Data (Pointer) > 7 then
Raise_Exception
( Data_Error'Identity,
Wrong_Unused_Count
);
end if;
Status.Mode := Bit_String_Body;
Status.Unused := Unused_Bits (Data (Pointer));
Check_Length
( Parent,
( Integer (Status.Length) * 8
- Integer (Data (Pointer))
) );
Pointer := Pointer + 1;
when Bit_String_Body =>
loop
Mask := 2**7;
Octet := Data (Pointer);
Pointer := Pointer + 1;
if Status.Length = 1 then
for Bit in 1
.. 8 - Integer (Status.Unused)
loop
Store (Parent, 0 /= (Octet and Mask));
Mask := Mask / 2;
end loop;
if ( Item.Primitive
or else
( Item.Definite
and then
Pointer > Item.Last
) ) then
State := 0;
return;
end if;
Status.Mode := Bit_String_Type;
exit;
end if;
Store (Parent, Octet);
Status.Length := Status.Length - 1;
if Pointer > Data'Last then
State := To_State (Status);
return;
end if;
end loop;
when Bit_String_Type =>
if ( Item.Definite
and then
Pointer > Item.Last
) then
State := 0;
return;
end if;
case Data (Pointer) is
when ASN1_Type'Pos (Bit_String_Tag) =>
Status.Mode := Length_Lookahead;
when 0 =>
Status.Mode := End_Of_Content;
when others =>
Raise_Exception
( Data_Error'Identity,
Bit_String_Invalid_EOC
);
end case;
Pointer := Pointer + 1;
when Length_Lookahead => -- Checking zero string
case Data (Pointer) is
when 0 => -- Empty bit string
Status.Mode := Null_Contents;
Pointer := Pointer + 1;
when 1..127 => -- Non-empty bit string
State := Start_Length;
exit;
when 128..255 =>
Raise_Exception
( Data_Error'Identity,
Nested
);
end case;
when Null_Contents => -- Checking zero string
if Data (Pointer) /= 0 then
Raise_Exception
( Data_Error'Identity,
Bit_String_Invalid_EOC
);
end if;
Status.Mode := Bit_String_Type;
Pointer := Pointer + 1;
if ( Item.Definite
and then
Pointer > Item.Last
) then
State := 0;
return;
end if;
when End_Of_Content =>
if Data (Pointer) /= 0 then
Raise_Exception
( Data_Error'Identity,
Bit_String_Invalid_EOC
);
end if;
Pointer := Pointer + 1;
State := 0;
return;
end case;
if Pointer > Data'Last then
State := To_State (Status);
return;
end if;
end loop;
end;
end if;
end loop;
end Generic_Feed;
procedure Internal_Feed is
new Generic_Feed (Implicit_Bit_String_Data_Item);
procedure External_Feed is
new Generic_Feed (Implicit_External_Bit_String_Data_Item);
procedure Feed
( Item : in out Implicit_Bit_String_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
Item.Length := 0;
end if;
Internal_Feed (Item, Item.Data, Data, Pointer, Client, State);
end Feed;
procedure Feed
( Item : in out Implicit_External_Bit_String_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.Buffer = null then
Uninitialized (Item);
end if;
Item.Length := 0;
Item.Start := Item.Buffer.Length + 1;
end if;
External_Feed (Item, Item.Data, Data, Pointer, Client, State);
end Feed;
function Get_ASN1_Type
( Item : Implicit_External_Bit_String_Data_Item
) return ASN1_Type is
begin
return Bit_String_Tag;
end Get_ASN1_Type;
function Get_Buffer
( Item : Implicit_External_Bit_String_Data_Item
) return External_String_Buffer_Ptr is
begin
return Item.Buffer;
end Get_Buffer;
function Get_Length
( Item : Implicit_External_Bit_String_Data_Item
) return Natural is
begin
return Item.Length;
end Get_Length;
function Get_Value
( Item : Implicit_External_Bit_String_Data_Item
) return Boolean_Array is
Result : Boolean_Array (1..Item.Length);
Current : Integer := Item.Start;
Octet : Stream_Element;
Mask : Stream_Element := 0;
begin
if Item.Buffer = null then
return (1..0 => False);
end if;
for Index in Result'Range loop
if Mask = 0 then
Mask := 2**7;
Octet := Character'Pos (Item.Buffer.Buffer (Current));
Current := Current + 1;
end if;
Result (Index) := 0 /= (Octet and Mask);
Mask := Mask / 2;
end loop;
return Result;
end Get_Value;
function Is_Implicit (Item : Implicit_Bit_String_Data_Item)
return Boolean is
begin
return True;
end Is_Implicit;
function Is_Implicit (Item : Implicit_External_Bit_String_Data_Item)
return Boolean is
begin
return True;
end Is_Implicit;
procedure Reset_Feed
( Item : in out Implicit_Bit_String_Data_Item;
Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
Item.Data.Primitive := 0 = (Data (Pointer) and 16#20#);
Item.Data.Nested := False;
end Reset_Feed;
procedure Reset_Feed
( Item : in out Implicit_External_Bit_String_Data_Item;
Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset
) is
begin
if Item.Buffer = null then
Uninitialized (Item);
end if;
Item.Data.Primitive := 0 = (Data (Pointer) and 16#20#);
Item.Data.Nested := False;
Item.Length := 0;
Item.Start := Item.Buffer.Length + 1;
end Reset_Feed;
function Self
( Item : Implicit_External_Bit_String_Data_Item'Class
) return Implicit_External_Bit_String_Data_Item_Ptr is
package From_Address is
new System.Address_To_Access_Conversions
( Implicit_External_Bit_String_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_Bit_String_Data_Item;
Tag : Tag_Type;
Length : Stream_Element_Offset
) is
begin
if Length > 0 then
Item.Data.Definite := True;
Item.Data.Last := Length;
elsif Length = 0 then
Raise_Exception (Data_Error'Identity, Invalid_Length);
else
Item.Data.Definite := False;
end if;
end Set_Implicit_Tag;
procedure Set_Implicit_Tag
( Item : in out Implicit_External_Bit_String_Data_Item;
Tag : Tag_Type;
Length : Stream_Element_Offset
) is
begin
if Length > 0 then
Item.Data.Definite := True;
Item.Data.Last := Length;
elsif Length = 0 then
Raise_Exception (Data_Error'Identity, Invalid_Length);
else
Item.Data.Definite := False;
end if;
end Set_Implicit_Tag;
procedure Set_Value
( Item : in out Implicit_External_Bit_String_Data_Item;
Value : Boolean_Array
) is
Size : constant Natural := (Value'Length + 7) / 8;
Mask : Stream_Element := 0;
begin
if Item.Buffer = null then
Uninitialized (Item);
elsif Item.Buffer.Size - Item.Buffer.Length < Size then
Raise_Exception (Constraint_Error'Identity, Too_Large);
end if;
declare
Buffer : String renames Item.Buffer.Buffer;
Length : Integer renames Item.Buffer.Length;
begin
Item.Start := Length + 1;
for Index in Value'Range loop
if Mask = 0 then
Mask := 2**7;
Length := Length + 1;
Buffer (Length) := Character'Val (0);
end if;
if Value (Index) then
Buffer (Length) :=
Character'Val
( Character'Pos (Buffer (Length)) or Mask
);
end if;
Mask := Mask / 2;
end loop;
end;
end Set_Value;
end GNAT.Sockets.Connection_State_Machine.ASN1.Bit_Strings.Implicit;
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