1 /* Mirrored Unicode characters.
2 Copyright (C) 2002, 2006, 2009-2021 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
4
5 This file is free software.
6 It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
7 You can redistribute it and/or modify it under either
8 - the terms of the GNU Lesser General Public License as published
9 by the Free Software Foundation; either version 3, or (at your
10 option) any later version, or
11 - the terms of the GNU General Public License as published by the
12 Free Software Foundation; either version 2, or (at your option)
13 any later version, or
14 - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
15
16 This file is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License and the GNU General Public License
20 for more details.
21
22 You should have received a copy of the GNU Lesser General Public
23 License and of the GNU General Public License along with this
24 program. If not, see <https://www.gnu.org/licenses/>. */
25
26 #include <config.h>
27
28 /* Specification. */
29 #include "unictype.h"
30
31 /* Define u_mirror table. */
32 #include "mirror.h"
33
34 bool
uc_mirror_char(ucs4_t uc,ucs4_t * puc)35 uc_mirror_char (ucs4_t uc, ucs4_t *puc)
36 {
37 unsigned int index1 = uc >> mirror_header_0;
38 if (index1 < mirror_header_1)
39 {
40 int lookup1 = u_mirror.level1[index1];
41 if (lookup1 >= 0)
42 {
43 unsigned int index2 = (uc >> mirror_header_2) & mirror_header_3;
44 int lookup2 = u_mirror.level2[lookup1 + index2];
45 if (lookup2 >= 0)
46 {
47 unsigned int index3 = (uc & mirror_header_4);
48 int lookup3 = u_mirror.level3[lookup2 + index3];
49
50 *puc = uc + lookup3;
51 return (lookup3 != 0);
52 }
53 }
54 }
55 *puc = uc;
56 return false;
57 }
58