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Function Definition: function To_Bits is new Ada.Unchecked_Conversion (Address, Bits);
Function Body: LE : constant := Standard'Default_Bit_Order;
-- Static constant set to 0 for big-endian, 1 for little-endian
-- The following is an array of masks used to mask the final byte, either
-- at the high end (big-endian case) or the low end (little-endian case).
Masks : constant array (1 .. 7) of Packed_Byte := (
(1 - LE) * 2#1000_0000# + LE * 2#0000_0001#,
(1 - LE) * 2#1100_0000# + LE * 2#0000_0011#,
(1 - LE) * 2#1110_0000# + LE * 2#0000_0111#,
(1 - LE) * 2#1111_0000# + LE * 2#0000_1111#,
(1 - LE) * 2#1111_1000# + LE * 2#0001_1111#,
(1 - LE) * 2#1111_1100# + LE * 2#0011_1111#,
(1 - LE) * 2#1111_1110# + LE * 2#0111_1111#);
-----------------------
-- Local Subprograms --
-----------------------
procedure Raise_Error;
-- Raise Constraint_Error, complaining about unequal lengths
-------------
-- Bit_And --
-------------
procedure Bit_And
(Left : Address;
Llen : Natural;
Right : Address;
Rlen : Natural;
Result : Address)
is
-- LeftB : constant Bits := To_Bits (Left);
-- RightB : constant Bits := To_Bits (Right);
-- ResultB : constant Bits := To_Bits (Result);
-- pragma Unreferenced (Llen);
pragma Unreferenced (Rlen);
begin
-- for the time being we don't provide dynamic range checks
-- if Llen /= Rlen then
-- Raise_Error;
-- end if;
-- this routine is called only for 1, 2, or 4 byte lengths.
-- The Rlen/Llen parameter is either, 8, 16, or 32.
if Llen = 8 then
declare
use Interfaces;
Left_Byte : Unsigned_8;
for Left_Byte'Address use Left;
Right_Byte : Unsigned_8;
for Right_Byte'Address use Right;
Result_Byte : Unsigned_8;
for Result_Byte'Address use Result;
begin
Result_Byte := Left_Byte and Right_Byte;
Function Definition: function To_Bits is new Ada.Unchecked_Conversion (Address, Bits);
Function Body: LE : constant := Standard'Default_Bit_Order;
-- Static constant set to 0 for big-endian, 1 for little-endian
-- The following is an array of masks used to mask the final byte, either
-- at the high end (big-endian case) or the low end (little-endian case).
Masks : constant array (1 .. 7) of Packed_Byte := (
(1 - LE) * 2#1000_0000# + LE * 2#0000_0001#,
(1 - LE) * 2#1100_0000# + LE * 2#0000_0011#,
(1 - LE) * 2#1110_0000# + LE * 2#0000_0111#,
(1 - LE) * 2#1111_0000# + LE * 2#0000_1111#,
(1 - LE) * 2#1111_1000# + LE * 2#0001_1111#,
(1 - LE) * 2#1111_1100# + LE * 2#0011_1111#,
(1 - LE) * 2#1111_1110# + LE * 2#0111_1111#);
-----------------------
-- Local Subprograms --
-----------------------
procedure Raise_Error;
-- Raise Constraint_Error, complaining about unequal lengths
-------------
-- Bit_And --
-------------
procedure Bit_And
(Left : Address;
Llen : Natural;
Right : Address;
Rlen : Natural;
Result : Address)
is
-- LeftB : constant Bits := To_Bits (Left);
-- RightB : constant Bits := To_Bits (Right);
-- ResultB : constant Bits := To_Bits (Result);
-- pragma Unreferenced (Llen);
pragma Unreferenced (Rlen);
begin
-- for the time being we don't provide dynamic range checks