1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
|
------------------------------------------------------------------------------
-- --
-- GNAT RUNTIME COMPONENTS --
-- --
-- S Y S T E M . W C H _ C N V --
-- --
-- B o d y --
-- --
-- $Revision: 1.8 $
-- --
-- Copyright (C) 1992-2001 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. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
-- This package contains generic subprograms used for converting between
-- sequences of Character and Wide_Character. All access to wide character
-- sequences is isolated in this 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_Wide_Char --
--------------------------------
function Char_Sequence_To_Wide_Char
(C : Character;
EM : WC_Encoding_Method)
return Wide_Character
is
B1 : Integer;
C1 : Character;
U : Unsigned_16;
W : Unsigned_16;
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.
-------------
-- Get_Hex --
-------------
procedure Get_Hex (N : Character) is
B2 : constant Integer := 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;
-- Start of processing for Char_Sequence_To_Wide_Char
begin
case EM is
when WCEM_Hex =>
if C /= ASCII.ESC then
return Wide_Character'Val (Character'Pos (C));
else
B1 := 0;
Get_Hex (In_Char);
Get_Hex (In_Char);
Get_Hex (In_Char);
Get_Hex (In_Char);
return Wide_Character'Val (B1);
end if;
when WCEM_Upper =>
if C > ASCII.DEL then
return
Wide_Character'Val
(Integer (256 * Character'Pos (C)) +
Character'Pos (In_Char));
else
return Wide_Character'Val (Character'Pos (C));
end if;
when WCEM_Shift_JIS =>
if C > ASCII.DEL then
return Shift_JIS_To_JIS (C, In_Char);
else
return Wide_Character'Val (Character'Pos (C));
end if;
when WCEM_EUC =>
if C > ASCII.DEL then
return EUC_To_JIS (C, In_Char);
else
return Wide_Character'Val (Character'Pos (C));
end if;
when WCEM_UTF8 =>
if C > ASCII.DEL then
-- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx#
-- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx#
U := Unsigned_16 (Character'Pos (C));
if (U and 2#11100000#) = 2#11000000# then
W := Shift_Left (U and 2#00011111#, 6);
U := Unsigned_16 (Character'Pos (In_Char));
if (U and 2#11000000#) /= 2#10000000# then
raise Constraint_Error;
end if;
W := W or (U and 2#00111111#);
elsif (U and 2#11110000#) = 2#11100000# then
W := Shift_Left (U and 2#00001111#, 12);
U := Unsigned_16 (Character'Pos (In_Char));
if (U and 2#11000000#) /= 2#10000000# then
raise Constraint_Error;
end if;
W := W or Shift_Left (U and 2#00111111#, 6);
U := Unsigned_16 (Character'Pos (In_Char));
if (U and 2#11000000#) /= 2#10000000# then
raise Constraint_Error;
end if;
W := W or (U and 2#00111111#);
else
raise Constraint_Error;
end if;
return Wide_Character'Val (W);
else
return Wide_Character'Val (Character'Pos (C));
end if;
when WCEM_Brackets =>
if C /= '[' then
return Wide_Character'Val (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
raise Constraint_Error;
end if;
end if;
if In_Char /= ']' then
raise Constraint_Error;
end if;
return Wide_Character'Val (B1);
end case;
end Char_Sequence_To_Wide_Char;
--------------------------------
-- Wide_Char_To_Char_Sequence --
--------------------------------
procedure Wide_Char_To_Char_Sequence
(WC : Wide_Character;
EM : WC_Encoding_Method)
is
Val : constant Natural := Wide_Character'Pos (WC);
Hexc : constant array (0 .. 15) of Character := "0123456789ABCDEF";
C1, C2 : Character;
U : Unsigned_16;
begin
case EM is
when WCEM_Hex =>
if Val < 256 then
Out_Char (Character'Val (Val));
else
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));
end if;
when WCEM_Upper =>
if Val < 128 then
Out_Char (Character'Val (Val));
elsif Val < 16#8000# 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));
else
JIS_To_Shift_JIS (WC, C1, C2);
Out_Char (C1);
Out_Char (C2);
end if;
when WCEM_EUC =>
if Val < 128 then
Out_Char (Character'Val (Val));
else
JIS_To_EUC (WC, C1, C2);
Out_Char (C1);
Out_Char (C2);
end if;
when WCEM_UTF8 =>
U := Unsigned_16 (Val);
-- 16#0000#-16#007f#: 2#0xxxxxxx#
-- 16#0080#-16#07ff#: 2#110xxxxx# 2#10xxxxxx#
-- 16#0800#-16#ffff#: 2#1110xxxx# 2#10xxxxxx# 2#10xxxxxx#
if U < 16#80# then
Out_Char (Character'Val (U));
elsif U < 16#0800# then
Out_Char (Character'Val (2#11000000# or Shift_Right (U, 6)));
Out_Char (Character'Val (2#10000000# or (U and 2#00111111#)));
else
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#)));
end if;
when WCEM_Brackets =>
if Val < 256 then
Out_Char (Character'Val (Val));
else
Out_Char ('[');
Out_Char ('"');
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));
Out_Char ('"');
Out_Char (']');
end if;
end case;
end Wide_Char_To_Char_Sequence;
end System.WCh_Cnv;
|
