gcc/ada/s-wchjis.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUNTIME COMPONENTS                          --
   4 --                                                                          --
   5 --                       S Y S T E M . W C H _ J I S                        --
   6 --                                                                          --
   7 --                                 S p e c                                  --
   8 --                                                                          --
   9 --        Copyright (C) 1992,1993,1994 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 2,  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.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 --  This package contains routines used for converting between internal
  35 --  JIS codes and the two external forms we support (EUC and Shift-JIS)
  36
  37 package System.WCh_JIS is
  38 pragma Pure (WCh_JIS);
  39
  40    function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character;
  41    --  Given the two bytes of a EUC representation, return the
  42    --  corresponding JIS code wide character. Raises Constraint_Error
  43    --  if the two characters are not a valid EUC encoding.
  44
  45    procedure JIS_To_EUC
  46      (J    : in Wide_Character;
  47       EUC1 : out Character;
  48       EUC2 : out Character);
  49
  50    --  Given a wide character in JIS form, produce the corresponding
  51    --  two bytes of the EUC representation of this character. This is
  52    --  only used if J is not in the normal ASCII range, i.e. on entry
  53    --  we know that Wide_Character'Pos (J) >= 16#0080# and that we
  54    --  thus require a two byte EUC representation (ASCII codes appear
  55    --  unchanged as a single byte in EUC). No error checking is performed,
  56    --  the input code is assumed to be in an appropriate range.
  57
  58    procedure JIS_To_Shift_JIS
  59      (J   : in Wide_Character;
  60       SJ1 : out Character;
  61       SJ2 : out Character);
  62    --  Given a wide character code in JIS form, produce the corresponding
  63    --  two bytes of the Shift-JIS representation of this character. This
  64    --  is only used if J is not in the normal ASCII range, i.e. on entry
  65    --  we know that Wide_Character'Pos (J) >= 16#0080# and that we
  66    --  thus require a two byte EUC representation (ASCII codes appear
  67    --  unchanged as a single byte in EUC). No error checking is performed,
  68    --  the input code is assumed to be in an appropriate range (note in
  69    --  particular that input codes in the range 16#0080#-16#00FF#, i.e.
  70    --  Hankaku Kana, do not appear, since Shift JIS has no representation
  71    --  for such codes.
  72
  73    function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character;
  74    --  Given the two bytes of a Shift-JIS representation, return the
  75    --  corresponding JIS code wide character. Raises Constraint_Error if
  76    --  the two characters are not a valid shift-JIS encoding.
  77
  78 end System.WCh_JIS;