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gnat-sockets-connection_state_machine-big_endian-unsigneds.adb
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-- --
-- package Copyright (c) Dmitry A. Kazakov --
-- GNAT.Sockets.Connection_State_Machine. Luebeck --
-- Big_Endian.Unsigneds Winter, 2012 --
-- Implementation --
-- Last revision : 14:07 11 Nov 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;
package body GNAT.Sockets.Connection_State_Machine.Big_Endian.
Unsigneds is
procedure Feed
( Item : in out Unsigned_8_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 > 1 then
Raise_Exception
( Data_Error'Identity,
"Protocol error reading 8-bit big endian unsigned"
);
elsif State = 0 then
Item.Value := 0;
State := 1;
end if;
if Pointer <= Data'Last then
Item.Value := Unsigned_8 (Data (Pointer));
Pointer := Pointer + 1;
State := 0;
end if;
end Feed;
procedure Feed
( Item : in out Unsigned_16_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 > 2 then
Raise_Exception
( Data_Error'Identity,
"Protocol error reading 16-bit big endian unsigned"
);
elsif State = 0 then
Item.Value := 0;
State := 2;
end if;
while Pointer <= Data'Last and then State > 0 loop
State := State - 1;
Item.Value :=
( Item.Value
or Shift_Left
( Unsigned_16 (Data (Pointer)),
8 * Natural (State)
) );
Pointer := Pointer + 1;
end loop;
end Feed;
procedure Feed
( Item : in out Unsigned_32_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 > 4 then
Raise_Exception
( Data_Error'Identity,
"Protocol error reading 32-bit big endian unsigned"
);
elsif State = 0 then
Item.Value := 0;
State := 4;
end if;
while Pointer <= Data'Last and then State > 0 loop
State := State - 1;
Item.Value :=
( Item.Value
or Shift_Left
( Unsigned_32 (Data (Pointer)),
8 * Natural (State)
) );
Pointer := Pointer + 1;
end loop;
end Feed;
procedure Feed
( Item : in out Unsigned_64_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 > 8 then
Raise_Exception
( Data_Error'Identity,
"Protocol error reading 64-bit big endian unsigned"
);
elsif State = 0 then
Item.Value := 0;
State := 8;
end if;
while Pointer <= Data'Last and then State > 0 loop
State := State - 1;
Item.Value :=
( Item.Value
or Shift_Left
( Unsigned_64 (Data (Pointer)),
8 * Natural (State)
) );
Pointer := Pointer + 1;
end loop;
end Feed;
procedure Get
( Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : out Unsigned_8
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - 1 > Data'Last
) )
then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
Value := Unsigned_8 (Data (Pointer));
Pointer := Pointer + 1;
end Get;
procedure Get
( Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : out Unsigned_16
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - 1 > Data'Last
) )
then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
elsif Pointer + 1 > Data'Last then
Raise_Exception (End_Error'Identity, "End of data");
end if;
Value :=
( Shift_Left (Unsigned_16 (Data (Pointer)), 8)
or Unsigned_16 (Data (Pointer + 1))
);
Pointer := Pointer + 2;
end Get;
procedure Get
( Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : out Unsigned_32
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - 1 > Data'Last
) )
then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
elsif Pointer + 3 > Data'Last then
Raise_Exception (End_Error'Identity, "End of data");
end if;
Value :=
( Shift_Left (Unsigned_32 (Data (Pointer )), 24)
or Shift_Left (Unsigned_32 (Data (Pointer + 1)), 16)
or Shift_Left (Unsigned_32 (Data (Pointer + 2)), 8)
or Unsigned_32 (Data (Pointer + 3))
);
Pointer := Pointer + 4;
end Get;
procedure Get
( Data : Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : out Unsigned_64
) is
begin
if ( Pointer < Data'First
or else
( Pointer > Data'Last
and then
Pointer - 1 > Data'Last
) )
then
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
elsif Pointer + 7 > Data'Last then
Raise_Exception (End_Error'Identity, "End of data");
end if;
Value :=
( Shift_Left (Unsigned_64 (Data (Pointer)), 56)
or Shift_Left (Unsigned_64 (Data (Pointer + 1)), 48)
or Shift_Left (Unsigned_64 (Data (Pointer + 2)), 40)
or Shift_Left (Unsigned_64 (Data (Pointer + 3)), 32)
or Shift_Left (Unsigned_64 (Data (Pointer + 4)), 24)
or Shift_Left (Unsigned_64 (Data (Pointer + 5)), 16)
or Shift_Left (Unsigned_64 (Data (Pointer + 6)), 8)
or Unsigned_64 (Data (Pointer + 7))
);
Pointer := Pointer + 8;
end Get;
procedure Put
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Unsigned_8
) is
begin
if Pointer < Data'First or else Data'Last - Pointer < 0 then
if Pointer >= Data'First and then Pointer - 1 <= Data'Last then
Raise_Exception (End_Error'Identity, No_Room);
else
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
end if;
Data (Pointer) := Stream_Element (Value);
Pointer := Pointer + 1;
end Put;
procedure Put
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Unsigned_16
) is
begin
if Pointer < Data'First or else Data'Last - Pointer < 1 then
if Pointer >= Data'First and then Pointer - 1 <= Data'Last then
Raise_Exception (End_Error'Identity, No_Room);
else
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
end if;
Data (Pointer) := Stream_Element (Shift_Right (Value, 8));
Data (Pointer + 1) := Stream_Element (Value and 16#FF#);
Pointer := Pointer + 2;
end Put;
procedure Put
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Unsigned_32
) is
Item : Unsigned_32 := Value;
begin
if Pointer < Data'First or else Data'Last - Pointer < 3 then
if Pointer >= Data'First and then Pointer - 1 <= Data'Last then
Raise_Exception (End_Error'Identity, No_Room);
else
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
end if;
for Byte in reverse Stream_Element_Offset range 0..3 loop
Data (Pointer + Byte) := Stream_Element (Item and 16#FF#);
Item := Shift_Right (Item, 8);
end loop;
Pointer := Pointer + 4;
end Put;
procedure Put
( Data : in out Stream_Element_Array;
Pointer : in out Stream_Element_Offset;
Value : Unsigned_64
) is
Item : Unsigned_64 := Value;
begin
if Pointer < Data'First or else Data'Last - Pointer < 7 then
if Pointer >= Data'First and then Pointer - 1 <= Data'Last then
Raise_Exception (End_Error'Identity, No_Room);
else
Raise_Exception (Layout_Error'Identity, Out_Of_Bounds);
end if;
end if;
for Byte in reverse Stream_Element_Offset range 0..7 loop
Data (Pointer + Byte) := Stream_Element (Item and 16#FF#);
Item := Shift_Right (Item, 8);
end loop;
Pointer := Pointer + 8;
end Put;
end GNAT.Sockets.Connection_State_Machine.Big_Endian.Unsigneds;