with System.Storage_Elements;
with System.Unsigned_Types;
with Unchecked_Conversion;
package body System.Pack_03 is
subtype Ofs is System.Storage_Elements.Storage_Offset;
subtype Uns is System.Unsigned_Types.Unsigned;
subtype N07 is System.Unsigned_Types.Unsigned range 0 .. 7;
use type System.Storage_Elements.Storage_Offset;
use type System.Unsigned_Types.Unsigned;
type Cluster is record
E0, E1, E2, E3, E4, E5, E6, E7 : Bits_03;
end record;
for Cluster use record
E0 at 0 range 0 * Bits .. 0 * Bits + Bits - 1;
E1 at 0 range 1 * Bits .. 1 * Bits + Bits - 1;
E2 at 0 range 2 * Bits .. 2 * Bits + Bits - 1;
E3 at 0 range 3 * Bits .. 3 * Bits + Bits - 1;
E4 at 0 range 4 * Bits .. 4 * Bits + Bits - 1;
E5 at 0 range 5 * Bits .. 5 * Bits + Bits - 1;
E6 at 0 range 6 * Bits .. 6 * Bits + Bits - 1;
E7 at 0 range 7 * Bits .. 7 * Bits + Bits - 1;
end record;
for Cluster'Size use Bits * 8;
for Cluster'Alignment use Integer'Min (Standard'Maximum_Alignment,
1 +
1 * Boolean'Pos (Bits mod 2 = 0) +
2 * Boolean'Pos (Bits mod 4 = 0));
type Cluster_Ref is access Cluster;
function To_Ref is new
Unchecked_Conversion (System.Address, Cluster_Ref);
function Get_03 (Arr : System.Address; N : Natural) return Bits_03 is
C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
begin
case N07 (Uns (N) mod 8) is
when 0 => return C.E0;
when 1 => return C.E1;
when 2 => return C.E2;
when 3 => return C.E3;
when 4 => return C.E4;
when 5 => return C.E5;
when 6 => return C.E6;
when 7 => return C.E7;
end case;
end Get_03;
procedure Set_03 (Arr : System.Address; N : Natural; E : Bits_03) is
C : constant Cluster_Ref := To_Ref (Arr + Bits * Ofs (Uns (N) / 8));
begin
case N07 (Uns (N) mod 8) is
when 0 => C.E0 := E;
when 1 => C.E1 := E;
when 2 => C.E2 := E;
when 3 => C.E3 := E;
when 4 => C.E4 := E;
when 5 => C.E5 := E;
when 6 => C.E6 := E;
when 7 => C.E7 := E;
end case;
end Set_03;
end System.Pack_03;