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-------------------------------------------------------------------------------
--- --
--- GNAT RUNTIME COMPONENTS --
--- --
--- S Y S T E M . W C H _ J I S --
--- --
--- B o d y --
--- --
--- $Revision: 1.1.16.2 $
--- --
--- Copyright (C) 1992,1993,1994 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, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, 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, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
-package body System.WCh_JIS is
-
- type Byte is mod 256;
-
- EUC_Hankaku_Kana : constant Byte := 16#8E#;
- -- Prefix byte in EUC for Hankaku Kana (small Katakana). Such characters
- -- in EUC are represented by a prefix byte followed by the code, which
- -- is in the upper half (the corresponding JIS internal code is in the
- -- range 16#0080# - 16#00FF#).
-
- function EUC_To_JIS (EUC1, EUC2 : Character) return Wide_Character is
- EUC1B : constant Byte := Character'Pos (EUC1);
- EUC2B : constant Byte := Character'Pos (EUC2);
-
- begin
- if EUC2B not in 16#A0# .. 16#FE# then
- raise Constraint_Error;
- end if;
-
- if EUC1B = EUC_Hankaku_Kana then
- return Wide_Character'Val (EUC2B);
-
- else
- if EUC1B not in 16#A0# .. 16#FE# then
- raise Constraint_Error;
- else
- return Wide_Character'Val
- (256 * Natural (EUC1B and 16#7F#) + Natural (EUC2B and 16#7F#));
- end if;
- end if;
- end EUC_To_JIS;
-
- ----------------
- -- JIS_To_EUC --
- ----------------
-
- procedure JIS_To_EUC
- (J : in Wide_Character;
- EUC1 : out Character;
- EUC2 : out Character)
- is
- JIS1 : constant Natural := Wide_Character'Pos (J) / 256;
- JIS2 : constant Natural := Wide_Character'Pos (J) rem 256;
-
- begin
- if JIS1 = 0 then
- EUC1 := Character'Val (EUC_Hankaku_Kana);
- EUC2 := Character'Val (JIS2);
-
- else
- EUC1 := Character'Val (JIS1 + 16#80#);
- EUC2 := Character'Val (JIS2 + 16#80#);
- end if;
- end JIS_To_EUC;
-
- ----------------------
- -- JIS_To_Shift_JIS --
- ----------------------
-
- procedure JIS_To_Shift_JIS
- (J : in Wide_Character;
- SJ1 : out Character;
- SJ2 : out Character)
- is
- JIS1 : Byte;
- JIS2 : Byte;
-
- begin
- -- The following is the required algorithm, it's hard to make any
- -- more intelligent comments! This was copied from a public domain
- -- C program called etos.c (author unknown).
-
- JIS1 := Byte (Natural (Wide_Character'Pos (J) / 256));
- JIS2 := Byte (Natural (Wide_Character'Pos (J) rem 256));
-
- if JIS1 > 16#5F# then
- JIS1 := JIS1 + 16#80#;
- end if;
-
- if (JIS1 mod 2) = 0 then
- SJ1 := Character'Val ((JIS1 - 16#30#) / 2 + 16#88#);
- SJ2 := Character'Val (JIS2 + 16#7E#);
-
- else
- if JIS2 >= 16#60# then
- JIS2 := JIS2 + 16#01#;
- end if;
-
- SJ1 := Character'Val ((JIS1 - 16#31#) / 2 + 16#89#);
- SJ2 := Character'Val (JIS2 + 16#1F#);
- end if;
- end JIS_To_Shift_JIS;
-
- ----------------------
- -- Shift_JIS_To_JIS --
- ----------------------
-
- function Shift_JIS_To_JIS (SJ1, SJ2 : Character) return Wide_Character is
- SJIS1 : Byte;
- SJIS2 : Byte;
- JIS1 : Byte;
- JIS2 : Byte;
-
- begin
- -- The following is the required algorithm, it's hard to make any
- -- more intelligent comments! This was copied from a public domain
- -- C program called stoj.c written by shige@csk.JUNET.
-
- SJIS1 := Character'Pos (SJ1);
- SJIS2 := Character'Pos (SJ2);
-
- if SJIS1 >= 16#E0# then
- SJIS1 := SJIS1 - 16#40#;
- end if;
-
- if SJIS2 >= 16#9F# then
- JIS1 := (SJIS1 - 16#88#) * 2 + 16#30#;
- JIS2 := SJIS2 - 16#7E#;
-
- else
- if SJIS2 >= 16#7F# then
- SJIS2 := SJIS2 - 16#01#;
- end if;
-
- JIS1 := (SJIS1 - 16#89#) * 2 + 16#31#;
- JIS2 := SJIS2 - 16#1F#;
- end if;
-
- if JIS1 not in 16#20# .. 16#7E#
- or else JIS2 not in 16#20# .. 16#7E#
- then
- raise Constraint_Error;
- else
- return Wide_Character'Val (256 * Natural (JIS1) + Natural (JIS2));
- end if;
- end Shift_JIS_To_JIS;
-
-end System.WCh_JIS;
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