--  To hexadecimal conversions.
--  Copyright (C) 2006 Tristan Gingold
--
--  GHDL 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, or (at your option) any later
--  version.
--
--  GHDL 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 GCC; see the file COPYING.  If not, write to the Free
--  Software Foundation, 59 Temple Place - Suite 330, Boston, MA
--  02111-1307, USA.
with Ada.Unchecked_Conversion;

package body Hex_Images is
   type Hex_Str_Type is array (0 .. 15) of Character;
   Hexdigits : constant Hex_Str_Type := "0123456789abcdef";

   function Hex_Image (B : Unsigned_8) return String is
      Res : String (1 .. 2);
   begin
      for I in 1 .. 2 loop
         Res (I) := Hexdigits
           (Natural (Shift_Right (B, 8 - 4 * I) and 16#0f#));
      end loop;
      return Res;
   end Hex_Image;

   function Conv is new Ada.Unchecked_Conversion
     (Source => Integer_32, Target => Unsigned_32);

   function Hex_Image (W : Unsigned_32) return String is
      Res : String (1 .. 8);
   begin
      for I in 1 .. 8 loop
         Res (I) := Hexdigits
           (Natural (Shift_Right (W, 32 - 4 * I) and 16#0f#));
      end loop;
      return Res;
   end Hex_Image;

   function Hex_Image (W : Unsigned_64) return String is
      Res : String (1 .. 16);
   begin
      for I in 1 .. 16 loop
         Res (I) := Hexdigits
           (Natural (Shift_Right (W, 64 - 4 * I) and 16#0f#));
      end loop;
      return Res;
   end Hex_Image;

   function Hex_Image (W : Unsigned_16) return String is
      Res : String (1 .. 4);
   begin
      for I in 1 .. 4 loop
         Res (I) := Hexdigits
           (Natural (Shift_Right (W, 16 - 4 * I) and 16#0f#));
      end loop;
      return Res;
   end Hex_Image;

   function Hex_Image (W : Integer_32) return String is
   begin
      return Hex_Image (Conv (W));
   end Hex_Image;
end Hex_Images;