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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                       S Y S T E M . W C H _ C N V                        --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2009, 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 3,  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.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------
 
pragma Compiler_Unit;
 
with Interfaces;     use Interfaces;
with System.WCh_Con; use System.WCh_Con;
with System.WCh_JIS; use System.WCh_JIS;
 
package body System.WCh_Cnv is
 
   -----------------------------
   -- Char_Sequence_To_UTF_32 --
   -----------------------------
 
   function Char_Sequence_To_UTF_32
     (C  : Character;
      EM : System.WCh_Con.WC_Encoding_Method) return UTF_32_Code
   is
      B1 : Unsigned_32;
      C1 : Character;
      U  : Unsigned_32;
      W  : Unsigned_32;
 
      procedure Get_Hex (N : Character);
      --  If N is a hex character, then set B1 to 16 * B1 + character N.
      --  Raise Constraint_Error if character N is not a hex character.
 
      procedure Get_UTF_Byte;
      pragma Inline (Get_UTF_Byte);
      --  Used to interpret a 2#10xxxxxx# continuation byte in UTF-8 mode.
      --  Reads a byte, and raises CE if the first two bits are not 10.
      --  Otherwise shifts W 6 bits left and or's in the 6 xxxxxx bits.
 
      -------------
      -- Get_Hex --
      -------------
 
      procedure Get_Hex (N : Character) is
         B2 : constant Unsigned_32 := Character'Pos (N);
      begin
         if B2 in Character'Pos ('0') .. Character'Pos ('9') then
            B1 := B1 * 16 + B2 - Character'Pos ('0');
         elsif B2 in Character'Pos ('A') .. Character'Pos ('F') then
            B1 := B1 * 16 + B2 - (Character'Pos ('A') - 10);
         elsif B2 in Character'Pos ('a') .. Character'Pos ('f') then
            B1 := B1 * 16 + B2 - (Character'Pos ('a') - 10);
         else
            raise Constraint_Error;
         end if;
      end Get_Hex;
 
      ------------------
      -- Get_UTF_Byte --
      ------------------
 
      procedure Get_UTF_Byte is
      begin
         U := Unsigned_32 (Character'Pos (In_Char));
 
         if (U and 2#11000000#) /= 2#10_000000# then
            raise Constraint_Error;
         end if;
 
         W := Shift_Left (W, 6) or (U and 2#00111111#);
      end Get_UTF_Byte;
 
   --  Start of processing for Char_Sequence_To_Wide
 
   begin
      case EM is
 
         when WCEM_Hex =>
            if C /= ASCII.ESC then
               return Character'Pos (C);
 
            else
               B1 := 0;
               Get_Hex (In_Char);
               Get_Hex (In_Char);
               Get_Hex (In_Char);
               Get_Hex (In_Char);
 
               return UTF_32_Code (B1);
            end if;
 
         when WCEM_Upper =>
            if C > ASCII.DEL then
               return 256 * Character'Pos (C) + Character'Pos (In_Char);
            else
               return Character'Pos (C);
            end if;
 
         when WCEM_Shift_JIS =>
            if C > ASCII.DEL then
               return Wide_Character'Pos (Shift_JIS_To_JIS (C, In_Char));
            else
               return Character'Pos (C);
            end if;
 
         when WCEM_EUC =>
            if C > ASCII.DEL then
               return Wide_Character'Pos (EUC_To_JIS (C, In_Char));
            else
               return Character'Pos (C);
            end if;
 
         when WCEM_UTF8 =>
 
            --  Note: for details of UTF8 encoding see RFC 3629
 
            U := Unsigned_32 (Character'Pos (C));
 
            --  16#00_0000#-16#00_007F#: 0xxxxxxx
 
            if (U and 2#10000000#) = 2#00000000# then
               return Character'Pos (C);
 
            --  16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx
 
            elsif (U and 2#11100000#) = 2#110_00000# then
               W := U and 2#00011111#;
               Get_UTF_Byte;
               return UTF_32_Code (W);
 
            --  16#00_0800#-16#00_ffff#: 1110xxxx 10xxxxxx 10xxxxxx
 
            elsif (U and 2#11110000#) = 2#1110_0000# then
               W := U and 2#00001111#;
               Get_UTF_Byte;
               Get_UTF_Byte;
               return UTF_32_Code (W);
 
            --  16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
 
            elsif (U and 2#11111000#) = 2#11110_000# then
               W := U and 2#00000111#;
 
               for K in 1 .. 3 loop
                  Get_UTF_Byte;
               end loop;
 
               return UTF_32_Code (W);
 
            --  16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx
            --                               10xxxxxx 10xxxxxx
 
            elsif (U and 2#11111100#) = 2#111110_00# then
               W := U and 2#00000011#;
 
               for K in 1 .. 4 loop
                  Get_UTF_Byte;
               end loop;
 
               return UTF_32_Code (W);
 
            --  16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx
            --                               10xxxxxx 10xxxxxx 10xxxxxx
 
            elsif (U and 2#11111110#) = 2#1111110_0# then
               W := U and 2#00000001#;
 
               for K in 1 .. 5 loop
                  Get_UTF_Byte;
               end loop;
 
               return UTF_32_Code (W);
 
            else
               raise Constraint_Error;
            end if;
 
         when WCEM_Brackets =>
            if C /= '[' then
               return Character'Pos (C);
            end if;
 
            if In_Char /= '"' then
               raise Constraint_Error;
            end if;
 
            B1 := 0;
            Get_Hex (In_Char);
            Get_Hex (In_Char);
 
            C1 := In_Char;
 
            if C1 /= '"' then
               Get_Hex (C1);
               Get_Hex (In_Char);
 
               C1 := In_Char;
 
               if C1 /= '"' then
                  Get_Hex (C1);
                  Get_Hex (In_Char);
 
                  C1 := In_Char;
 
                  if C1 /= '"' then
                     Get_Hex (C1);
                     Get_Hex (In_Char);
 
                     if B1 > Unsigned_32 (UTF_32_Code'Last) then
                        raise Constraint_Error;
                     end if;
 
                     if In_Char /= '"' then
                        raise Constraint_Error;
                     end if;
                  end if;
               end if;
            end if;
 
            if In_Char /= ']' then
               raise Constraint_Error;
            end if;
 
            return UTF_32_Code (B1);
 
      end case;
   end Char_Sequence_To_UTF_32;
 
   --------------------------------
   -- Char_Sequence_To_Wide_Char --
   --------------------------------
 
   function Char_Sequence_To_Wide_Char
     (C  : Character;
      EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character
   is
      function Char_Sequence_To_UTF is new Char_Sequence_To_UTF_32 (In_Char);
 
      U : constant UTF_32_Code := Char_Sequence_To_UTF (C, EM);
 
   begin
      if U > 16#FFFF# then
         raise Constraint_Error;
      else
         return Wide_Character'Val (U);
      end if;
   end Char_Sequence_To_Wide_Char;
 
   -----------------------------
   -- UTF_32_To_Char_Sequence --
   -----------------------------
 
   procedure UTF_32_To_Char_Sequence
     (Val : UTF_32_Code;
      EM  : System.WCh_Con.WC_Encoding_Method)
   is
      Hexc : constant array (UTF_32_Code range 0 .. 15) of Character :=
               "0123456789ABCDEF";
 
      C1, C2 : Character;
      U      : Unsigned_32;
 
   begin
      --  Raise CE for invalid UTF_32_Code
 
      if not Val'Valid then
         raise Constraint_Error;
      end if;
 
      --  Processing depends on encoding mode
 
      case EM is
 
         when WCEM_Hex =>
            if Val < 256 then
               Out_Char (Character'Val (Val));
            elsif Val <= 16#FFFF# then
               Out_Char (ASCII.ESC);
               Out_Char (Hexc (Val / (16**3)));
               Out_Char (Hexc ((Val / (16**2)) mod 16));
               Out_Char (Hexc ((Val / 16) mod 16));
               Out_Char (Hexc (Val mod 16));
            else
               raise Constraint_Error;
            end if;
 
         when WCEM_Upper =>
            if Val < 128 then
               Out_Char (Character'Val (Val));
            elsif Val < 16#8000# or else Val > 16#FFFF# then
               raise Constraint_Error;
            else
               Out_Char (Character'Val (Val / 256));
               Out_Char (Character'Val (Val mod 256));
            end if;
 
         when WCEM_Shift_JIS =>
            if Val < 128 then
               Out_Char (Character'Val (Val));
            elsif Val <= 16#FFFF# then
               JIS_To_Shift_JIS (Wide_Character'Val (Val), C1, C2);
               Out_Char (C1);
               Out_Char (C2);
            else
               raise Constraint_Error;
            end if;
 
         when WCEM_EUC =>
            if Val < 128 then
               Out_Char (Character'Val (Val));
            elsif Val <= 16#FFFF# then
               JIS_To_EUC (Wide_Character'Val (Val), C1, C2);
               Out_Char (C1);
               Out_Char (C2);
            else
               raise Constraint_Error;
            end if;
 
         when WCEM_UTF8 =>
 
            --  Note: for details of UTF8 encoding see RFC 3629
 
            U := Unsigned_32 (Val);
 
            --  16#00_0000#-16#00_007F#: 0xxxxxxx
 
            if U <= 16#00_007F# then
               Out_Char (Character'Val (U));
 
            --  16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx
 
            elsif U <= 16#00_07FF# then
               Out_Char (Character'Val (2#11000000# or Shift_Right (U, 6)));
               Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
 
            --  16#00_0800#-16#00_FFFF#: 1110xxxx 10xxxxxx 10xxxxxx
 
            elsif U <= 16#00_FFFF# then
               Out_Char (Character'Val (2#11100000# or Shift_Right (U, 12)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
 
            --  16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
 
            elsif U <= 16#10_FFFF# then
               Out_Char (Character'Val (2#11110000# or Shift_Right (U, 18)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
 
            --  16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx
            --                               10xxxxxx 10xxxxxx
 
            elsif U <= 16#03FF_FFFF# then
               Out_Char (Character'Val (2#11111000# or Shift_Right (U, 24)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
 
            --  16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx
            --                               10xxxxxx 10xxxxxx 10xxxxxx
 
            elsif U <= 16#7FFF_FFFF# then
               Out_Char (Character'Val (2#11111100# or Shift_Right (U, 30)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 24)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)
                                                          and 2#00111111#)));
               Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
 
            else
               raise Constraint_Error;
            end if;
 
         when WCEM_Brackets =>
 
            --  Values in the range 0-255 are directly output. Note that there
            --  is some issue with [ (16#5B#] since this will cause confusion
            --  if the resulting string is interpreted using brackets encoding.
 
            --  One possibility would be to always output [ as ["5B"] but in
            --  practice this is undesirable, since for example normal use of
            --  Wide_Text_IO for output (much more common than input), really
            --  does want to be able to say something like
 
            --     Put_Line ("Start of output [first run]");
 
            --  and have it come out as intended, rather than contaminated by
            --  a ["5B"] sequence in place of the left bracket.
 
            if Val < 256 then
               Out_Char (Character'Val (Val));
 
            --  Otherwise use brackets notation for vales greater than 255
 
            else
               Out_Char ('[');
               Out_Char ('"');
 
               if Val > 16#FFFF# then
                  if Val > 16#00FF_FFFF# then
                     Out_Char (Hexc (Val / 16 ** 7));
                     Out_Char (Hexc ((Val / 16 ** 6) mod 16));
                  end if;
 
                  Out_Char (Hexc ((Val / 16 ** 5) mod 16));
                  Out_Char (Hexc ((Val / 16 ** 4) mod 16));
               end if;
 
               Out_Char (Hexc ((Val / 16 ** 3) mod 16));
               Out_Char (Hexc ((Val / 16 ** 2) mod 16));
               Out_Char (Hexc ((Val / 16) mod 16));
               Out_Char (Hexc (Val mod 16));
 
               Out_Char ('"');
               Out_Char (']');
            end if;
      end case;
   end UTF_32_To_Char_Sequence;
 
   --------------------------------
   -- Wide_Char_To_Char_Sequence --
   --------------------------------
 
   procedure Wide_Char_To_Char_Sequence
     (WC : Wide_Character;
      EM : System.WCh_Con.WC_Encoding_Method)
   is
      procedure UTF_To_Char_Sequence is new UTF_32_To_Char_Sequence (Out_Char);
   begin
      UTF_To_Char_Sequence (Wide_Character'Pos (WC), EM);
   end Wide_Char_To_Char_Sequence;
 
end System.WCh_Cnv;

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Subversion Repositories openrisc_2011-10-31

[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [ada/] [s-wchcnv.adb] - Blame information for rev 404

Line No.	Rev	Author	Line
1	281	jeremybenn	`------------------------------------------------------------------------------`
2			`-- --`
3			`-- GNAT RUN-TIME COMPONENTS --`
4			`-- --`
5			`-- S Y S T E M . W C H _ C N V --`
6			`-- --`
7			`-- B o d y --`
8			`-- --`
9			`-- Copyright (C) 1992-2009, 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			`pragma Compiler_Unit;`
33
34			`with Interfaces; use Interfaces;`
35			`with System.WCh_Con; use System.WCh_Con;`
36			`with System.WCh_JIS; use System.WCh_JIS;`
37
38			`package body System.WCh_Cnv is`
39
40			`-----------------------------`
41			`-- Char_Sequence_To_UTF_32 --`
42			`-----------------------------`
43
44			`function Char_Sequence_To_UTF_32`
45			`(C : Character;`
46			`EM : System.WCh_Con.WC_Encoding_Method) return UTF_32_Code`
47			`is`
48			`B1 : Unsigned_32;`
49			`C1 : Character;`
50			`U : Unsigned_32;`
51			`W : Unsigned_32;`
52
53			`procedure Get_Hex (N : Character);`
54			`-- If N is a hex character, then set B1 to 16 * B1 + character N.`
55			`-- Raise Constraint_Error if character N is not a hex character.`
56
57			`procedure Get_UTF_Byte;`
58			`pragma Inline (Get_UTF_Byte);`
59			`-- Used to interpret a 2#10xxxxxx# continuation byte in UTF-8 mode.`
60			`-- Reads a byte, and raises CE if the first two bits are not 10.`
61			`-- Otherwise shifts W 6 bits left and or's in the 6 xxxxxx bits.`
62
63			`-------------`
64			`-- Get_Hex --`
65			`-------------`
66
67			`procedure Get_Hex (N : Character) is`
68			`B2 : constant Unsigned_32 := Character'Pos (N);`
69			`begin`
70			`if B2 in Character'Pos ('0') .. Character'Pos ('9') then`
71			`B1 := B1 * 16 + B2 - Character'Pos ('0');`
72			`elsif B2 in Character'Pos ('A') .. Character'Pos ('F') then`
73			`B1 := B1 * 16 + B2 - (Character'Pos ('A') - 10);`
74			`elsif B2 in Character'Pos ('a') .. Character'Pos ('f') then`
75			`B1 := B1 * 16 + B2 - (Character'Pos ('a') - 10);`
76			`else`
77			`raise Constraint_Error;`
78			`end if;`
79			`end Get_Hex;`
80
81			`------------------`
82			`-- Get_UTF_Byte --`
83			`------------------`
84
85			`procedure Get_UTF_Byte is`
86			`begin`
87			`U := Unsigned_32 (Character'Pos (In_Char));`
88
89			`if (U and 2#11000000#) /= 2#10_000000# then`
90			`raise Constraint_Error;`
91			`end if;`
92
93			`W := Shift_Left (W, 6) or (U and 2#00111111#);`
94			`end Get_UTF_Byte;`
95
96			`-- Start of processing for Char_Sequence_To_Wide`
97
98			`begin`
99			`case EM is`
100
101			`when WCEM_Hex =>`
102			`if C /= ASCII.ESC then`
103			`return Character'Pos (C);`
104
105			`else`
106			`B1 := 0;`
107			`Get_Hex (In_Char);`
108			`Get_Hex (In_Char);`
109			`Get_Hex (In_Char);`
110			`Get_Hex (In_Char);`
111
112			`return UTF_32_Code (B1);`
113			`end if;`
114
115			`when WCEM_Upper =>`
116			`if C > ASCII.DEL then`
117			`return 256 * Character'Pos (C) + Character'Pos (In_Char);`
118			`else`
119			`return Character'Pos (C);`
120			`end if;`
121
122			`when WCEM_Shift_JIS =>`
123			`if C > ASCII.DEL then`
124			`return Wide_Character'Pos (Shift_JIS_To_JIS (C, In_Char));`
125			`else`
126			`return Character'Pos (C);`
127			`end if;`
128
129			`when WCEM_EUC =>`
130			`if C > ASCII.DEL then`
131			`return Wide_Character'Pos (EUC_To_JIS (C, In_Char));`
132			`else`
133			`return Character'Pos (C);`
134			`end if;`
135
136			`when WCEM_UTF8 =>`
137
138			`-- Note: for details of UTF8 encoding see RFC 3629`
139
140			`U := Unsigned_32 (Character'Pos (C));`
141
142			`-- 16#00_0000#-16#00_007F#: 0xxxxxxx`
143
144			`if (U and 2#10000000#) = 2#00000000# then`
145			`return Character'Pos (C);`
146
147			`-- 16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx`
148
149			`elsif (U and 2#11100000#) = 2#110_00000# then`
150			`W := U and 2#00011111#;`
151			`Get_UTF_Byte;`
152			`return UTF_32_Code (W);`
153
154			`-- 16#00_0800#-16#00_ffff#: 1110xxxx 10xxxxxx 10xxxxxx`
155
156			`elsif (U and 2#11110000#) = 2#1110_0000# then`
157			`W := U and 2#00001111#;`
158			`Get_UTF_Byte;`
159			`Get_UTF_Byte;`
160			`return UTF_32_Code (W);`
161
162			`-- 16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx`
163
164			`elsif (U and 2#11111000#) = 2#11110_000# then`
165			`W := U and 2#00000111#;`
166
167			`for K in 1 .. 3 loop`
168			`Get_UTF_Byte;`
169			`end loop;`
170
171			`return UTF_32_Code (W);`
172
173			`-- 16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx`
174			`-- 10xxxxxx 10xxxxxx`
175
176			`elsif (U and 2#11111100#) = 2#111110_00# then`
177			`W := U and 2#00000011#;`
178
179			`for K in 1 .. 4 loop`
180			`Get_UTF_Byte;`
181			`end loop;`
182
183			`return UTF_32_Code (W);`
184
185			`-- 16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx`
186			`-- 10xxxxxx 10xxxxxx 10xxxxxx`
187
188			`elsif (U and 2#11111110#) = 2#1111110_0# then`
189			`W := U and 2#00000001#;`
190
191			`for K in 1 .. 5 loop`
192			`Get_UTF_Byte;`
193			`end loop;`
194
195			`return UTF_32_Code (W);`
196
197			`else`
198			`raise Constraint_Error;`
199			`end if;`
200
201			`when WCEM_Brackets =>`
202			`if C /= '[' then`
203			`return Character'Pos (C);`
204			`end if;`
205
206			`if In_Char /= '"' then`
207			`raise Constraint_Error;`
208			`end if;`
209
210			`B1 := 0;`
211			`Get_Hex (In_Char);`
212			`Get_Hex (In_Char);`
213
214			`C1 := In_Char;`
215
216			`if C1 /= '"' then`
217			`Get_Hex (C1);`
218			`Get_Hex (In_Char);`
219
220			`C1 := In_Char;`
221
222			`if C1 /= '"' then`
223			`Get_Hex (C1);`
224			`Get_Hex (In_Char);`
225
226			`C1 := In_Char;`
227
228			`if C1 /= '"' then`
229			`Get_Hex (C1);`
230			`Get_Hex (In_Char);`
231
232			`if B1 > Unsigned_32 (UTF_32_Code'Last) then`
233			`raise Constraint_Error;`
234			`end if;`
235
236			`if In_Char /= '"' then`
237			`raise Constraint_Error;`
238			`end if;`
239			`end if;`
240			`end if;`
241			`end if;`
242
243			`if In_Char /= ']' then`
244			`raise Constraint_Error;`
245			`end if;`
246
247			`return UTF_32_Code (B1);`
248
249			`end case;`
250			`end Char_Sequence_To_UTF_32;`
251
252			`--------------------------------`
253			`-- Char_Sequence_To_Wide_Char --`
254			`--------------------------------`
255
256			`function Char_Sequence_To_Wide_Char`
257			`(C : Character;`
258			`EM : System.WCh_Con.WC_Encoding_Method) return Wide_Character`
259			`is`
260			`function Char_Sequence_To_UTF is new Char_Sequence_To_UTF_32 (In_Char);`
261
262			`U : constant UTF_32_Code := Char_Sequence_To_UTF (C, EM);`
263
264			`begin`
265			`if U > 16#FFFF# then`
266			`raise Constraint_Error;`
267			`else`
268			`return Wide_Character'Val (U);`
269			`end if;`
270			`end Char_Sequence_To_Wide_Char;`
271
272			`-----------------------------`
273			`-- UTF_32_To_Char_Sequence --`
274			`-----------------------------`
275
276			`procedure UTF_32_To_Char_Sequence`
277			`(Val : UTF_32_Code;`
278			`EM : System.WCh_Con.WC_Encoding_Method)`
279			`is`
280			`Hexc : constant array (UTF_32_Code range 0 .. 15) of Character :=`
281			`"0123456789ABCDEF";`
282
283			`C1, C2 : Character;`
284			`U : Unsigned_32;`
285
286			`begin`
287			`-- Raise CE for invalid UTF_32_Code`
288
289			`if not Val'Valid then`
290			`raise Constraint_Error;`
291			`end if;`
292
293			`-- Processing depends on encoding mode`
294
295			`case EM is`
296
297			`when WCEM_Hex =>`
298			`if Val < 256 then`
299			`Out_Char (Character'Val (Val));`
300			`elsif Val <= 16#FFFF# then`
301			`Out_Char (ASCII.ESC);`
302			`Out_Char (Hexc (Val / (16**3)));`
303			`Out_Char (Hexc ((Val / (16**2)) mod 16));`
304			`Out_Char (Hexc ((Val / 16) mod 16));`
305			`Out_Char (Hexc (Val mod 16));`
306			`else`
307			`raise Constraint_Error;`
308			`end if;`
309
310			`when WCEM_Upper =>`
311			`if Val < 128 then`
312			`Out_Char (Character'Val (Val));`
313			`elsif Val < 16#8000# or else Val > 16#FFFF# then`
314			`raise Constraint_Error;`
315			`else`
316			`Out_Char (Character'Val (Val / 256));`
317			`Out_Char (Character'Val (Val mod 256));`
318			`end if;`
319
320			`when WCEM_Shift_JIS =>`
321			`if Val < 128 then`
322			`Out_Char (Character'Val (Val));`
323			`elsif Val <= 16#FFFF# then`
324			`JIS_To_Shift_JIS (Wide_Character'Val (Val), C1, C2);`
325			`Out_Char (C1);`
326			`Out_Char (C2);`
327			`else`
328			`raise Constraint_Error;`
329			`end if;`
330
331			`when WCEM_EUC =>`
332			`if Val < 128 then`
333			`Out_Char (Character'Val (Val));`
334			`elsif Val <= 16#FFFF# then`
335			`JIS_To_EUC (Wide_Character'Val (Val), C1, C2);`
336			`Out_Char (C1);`
337			`Out_Char (C2);`
338			`else`
339			`raise Constraint_Error;`
340			`end if;`
341
342			`when WCEM_UTF8 =>`
343
344			`-- Note: for details of UTF8 encoding see RFC 3629`
345
346			`U := Unsigned_32 (Val);`
347
348			`-- 16#00_0000#-16#00_007F#: 0xxxxxxx`
349
350			`if U <= 16#00_007F# then`
351			`Out_Char (Character'Val (U));`
352
353			`-- 16#00_0080#-16#00_07FF#: 110xxxxx 10xxxxxx`
354
355			`elsif U <= 16#00_07FF# then`
356			`Out_Char (Character'Val (2#11000000# or Shift_Right (U, 6)));`
357			`Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));`
358
359			`-- 16#00_0800#-16#00_FFFF#: 1110xxxx 10xxxxxx 10xxxxxx`
360
361			`elsif U <= 16#00_FFFF# then`
362			`Out_Char (Character'Val (2#11100000# or Shift_Right (U, 12)));`
363			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)`
364			`and 2#00111111#)));`
365			`Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));`
366
367			`-- 16#01_0000#-16#10_FFFF#: 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx`
368
369			`elsif U <= 16#10_FFFF# then`
370			`Out_Char (Character'Val (2#11110000# or Shift_Right (U, 18)));`
371			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)`
372			`and 2#00111111#)));`
373			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)`
374			`and 2#00111111#)));`
375			`Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));`
376
377			`-- 16#0020_0000#-16#03FF_FFFF#: 111110xx 10xxxxxx 10xxxxxx`
378			`-- 10xxxxxx 10xxxxxx`
379
380			`elsif U <= 16#03FF_FFFF# then`
381			`Out_Char (Character'Val (2#11111000# or Shift_Right (U, 24)));`
382			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)`
383			`and 2#00111111#)));`
384			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)`
385			`and 2#00111111#)));`
386			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)`
387			`and 2#00111111#)));`
388			`Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));`
389
390			`-- 16#0400_0000#-16#7FFF_FFFF#: 1111110x 10xxxxxx 10xxxxxx`
391			`-- 10xxxxxx 10xxxxxx 10xxxxxx`
392
393			`elsif U <= 16#7FFF_FFFF# then`
394			`Out_Char (Character'Val (2#11111100# or Shift_Right (U, 30)));`
395			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 24)`
396			`and 2#00111111#)));`
397			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 18)`
398			`and 2#00111111#)));`
399			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 12)`
400			`and 2#00111111#)));`
401			`Out_Char (Character'Val (2#10000000# or (Shift_Right (U, 6)`
402			`and 2#00111111#)));`
403			`Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));`
404
405			`else`
406			`raise Constraint_Error;`
407			`end if;`
408
409			`when WCEM_Brackets =>`
410
411			`-- Values in the range 0-255 are directly output. Note that there`
412			`-- is some issue with [ (16#5B#] since this will cause confusion`
413			`-- if the resulting string is interpreted using brackets encoding.`
414
415			`-- One possibility would be to always output [ as ["5B"] but in`
416			`-- practice this is undesirable, since for example normal use of`
417			`-- Wide_Text_IO for output (much more common than input), really`
418			`-- does want to be able to say something like`
419
420			`-- Put_Line ("Start of output [first run]");`
421
422			`-- and have it come out as intended, rather than contaminated by`
423			`-- a ["5B"] sequence in place of the left bracket.`
424
425			`if Val < 256 then`
426			`Out_Char (Character'Val (Val));`
427
428			`-- Otherwise use brackets notation for vales greater than 255`
429
430			`else`
431			`Out_Char ('[');`
432			`Out_Char ('"');`
433
434			`if Val > 16#FFFF# then`
435			`if Val > 16#00FF_FFFF# then`
436			`Out_Char (Hexc (Val / 16 ** 7));`
437			`Out_Char (Hexc ((Val / 16 ** 6) mod 16));`
438			`end if;`
439
440			`Out_Char (Hexc ((Val / 16 ** 5) mod 16));`
441			`Out_Char (Hexc ((Val / 16 ** 4) mod 16));`
442			`end if;`
443
444			`Out_Char (Hexc ((Val / 16 ** 3) mod 16));`
445			`Out_Char (Hexc ((Val / 16 ** 2) mod 16));`
446			`Out_Char (Hexc ((Val / 16) mod 16));`
447			`Out_Char (Hexc (Val mod 16));`
448
449			`Out_Char ('"');`
450			`Out_Char (']');`
451			`end if;`
452			`end case;`
453			`end UTF_32_To_Char_Sequence;`
454
455			`--------------------------------`
456			`-- Wide_Char_To_Char_Sequence --`
457			`--------------------------------`
458
459			`procedure Wide_Char_To_Char_Sequence`
460			`(WC : Wide_Character;`
461			`EM : System.WCh_Con.WC_Encoding_Method)`
462			`is`
463			`procedure UTF_To_Char_Sequence is new UTF_32_To_Char_Sequence (Out_Char);`
464			`begin`
465			`UTF_To_Char_Sequence (Wide_Character'Pos (WC), EM);`
466			`end Wide_Char_To_Char_Sequence;`
467
468			`end System.WCh_Cnv;`