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--                                                                          --

--                         GNAT RUN-TIME COMPONENTS                         --

--                                                                          --

--                       S Y S T E M . W C H _ J I S                        --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2005, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 2,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT;  see file COPYING.  If not, write --

-- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --

-- Boston, MA 02110-1301, 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, --

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-- however invalidate  any other reasons why  the executable file  might be --

-- covered by the  GNU Public License.                                      --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package contains routines used for converting between internal

--  JIS codes and the two external forms we support (EUC and Shift-JIS)

package System.WCh_JIS is

   pragma Pure;

   function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character;

   --  Given the two bytes of a EUC representation, return the

   --  corresponding JIS code wide character. Raises Constraint_Error

   --  if the two characters are not a valid EUC encoding.

   procedure JIS_To_EUC

     (J    : in Wide_Character;

      EUC1 : out Character;

      EUC2 : out Character);

   --  Given a wide character in JIS form, produce the corresponding

   --  two bytes of the EUC representation of this character. This is

   --  only used if J is not in the normal ASCII range, i.e. on entry

   --  we know that Wide_Character'Pos (J) >= 16#0080# and that we

   --  thus require a two byte EUC representation (ASCII codes appear

   --  unchanged as a single byte in EUC). No error checking is performed,

   --  the input code is assumed to be in an appropriate range.

   procedure JIS_To_Shift_JIS

     (J   : in Wide_Character;

      SJ1 : out Character;

      SJ2 : out Character);

   --  Given a wide character code in JIS form, produce the corresponding

   --  two bytes of the Shift-JIS representation of this character. This

   --  is only used if J is not in the normal ASCII range, i.e. on entry

   --  we know that Wide_Character'Pos (J) >= 16#0080# and that we

   --  thus require a two byte EUC representation (ASCII codes appear

   --  unchanged as a single byte in EUC). No error checking is performed,

   --  the input code is assumed to be in an appropriate range (note in

   --  particular that input codes in the range 16#0080#-16#00FF#, i.e.

   --  Hankaku Kana, do not appear, since Shift JIS has no representation

   --  for such codes.

   function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character;

   --  Given the two bytes of a Shift-JIS representation, return the

   --  corresponding JIS code wide character. Raises Constraint_Error if

   --  the two characters are not a valid shift-JIS encoding.

end System.WCh_JIS;