gcc/ada/libgnat/s-wchjis.ads

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT RUN-TIME 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) 1992-2023, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This package contains routines used for converting between internal
  33 --  JIS codes and the two external forms we support (EUC and Shift-JIS)
  34
  35 package System.WCh_JIS is
  36    pragma Pure;
  37
  38    function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character;
  39    --  Given the two bytes of a EUC representation, return the
  40    --  corresponding JIS code wide character. Raises Constraint_Error
  41    --  if the two characters are not a valid EUC encoding.
  42
  43    procedure JIS_To_EUC
  44      (J    : Wide_Character;
  45       EUC1 : out Character;
  46       EUC2 : out Character);
  47
  48    --  Given a wide character in JIS form, produce the corresponding
  49    --  two bytes of the EUC representation of this character. This is
  50    --  only used if J is not in the normal ASCII range, i.e. on entry
  51    --  we know that Wide_Character'Pos (J) >= 16#0080# and that we
  52    --  thus require a two byte EUC representation (ASCII codes appear
  53    --  unchanged as a single byte in EUC). No error checking is performed,
  54    --  the input code is assumed to be in an appropriate range.
  55
  56    procedure JIS_To_Shift_JIS
  57      (J   : Wide_Character;
  58       SJ1 : out Character;
  59       SJ2 : out Character);
  60    --  Given a wide character code in JIS form, produce the corresponding
  61    --  two bytes of the Shift-JIS representation of this character. This
  62    --  is only used if J is not in the normal ASCII range, i.e. on entry
  63    --  we know that Wide_Character'Pos (J) >= 16#0080# and that we
  64    --  thus require a two byte EUC representation (ASCII codes appear
  65    --  unchanged as a single byte in EUC). No error checking is performed,
  66    --  the input code is assumed to be in an appropriate range (note in
  67    --  particular that input codes in the range 16#0080#-16#00FF#, i.e.
  68    --  Hankaku Kana, do not appear, since Shift JIS has no representation
  69    --  for such codes.
  70
  71    function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character;
  72    --  Given the two bytes of a Shift-JIS representation, return the
  73    --  corresponding JIS code wide character. Raises Constraint_Error if
  74    --  the two characters are not a valid shift-JIS encoding.
  75
  76 end System.WCh_JIS;