1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--                       S Y S T E M . P A C K _ 4 8                        --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT was originally developed  by the GNAT team at  New York University. --
28-- Extensive contributions were provided by Ada Core Technologies Inc.      --
29--                                                                          --
30------------------------------------------------------------------------------
31
32--  Handling of packed arrays with Component_Size = 48
33
34package System.Pack_48 is
35   pragma Preelaborate;
36
37   Bits : constant := 48;
38
39   type Bits_48 is mod 2 ** Bits;
40   for Bits_48'Size use Bits;
41
42   function Get_48 (Arr : System.Address; N : Natural) return Bits_48;
43   --  Arr is the address of the packed array, N is the zero-based
44   --  subscript. This element is extracted and returned.
45
46   procedure Set_48 (Arr : System.Address; N : Natural; E : Bits_48);
47   --  Arr is the address of the packed array, N is the zero-based
48   --  subscript. This element is set to the given value.
49
50   function GetU_48 (Arr : System.Address; N : Natural) return Bits_48;
51   --  Arr is the address of the packed array, N is the zero-based
52   --  subscript. This element is extracted and returned. This version
53   --  is used when Arr may represent an unaligned address.
54
55   procedure SetU_48 (Arr : System.Address; N : Natural; E : Bits_48);
56   --  Arr is the address of the packed array, N is the zero-based
57   --  subscript. This element is set to the given value. This version
58   --  is used when Arr may represent an unaligned address
59
60end System.Pack_48;
61