1/* Mirrored Unicode characters.
2   Copyright (C) 2002, 2006, 2009-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2002.
4
5   This program is free software: you can redistribute it and/or modify it
6   under the terms of the GNU Lesser General Public License as published
7   by the Free Software Foundation; either version 3 of the License, or
8   (at your option) any later version.
9
10   This program is distributed in the hope that it will be useful,
11   but WITHOUT ANY WARRANTY; without even the implied warranty of
12   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13   Lesser General Public License for more details.
14
15   You should have received a copy of the GNU Lesser General Public License
16   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
17
18#include <config.h>
19
20/* Specification.  */
21#include "unictype.h"
22
23/* Define u_mirror table.  */
24#include "mirror.h"
25
26bool
27uc_mirror_char (ucs4_t uc, ucs4_t *puc)
28{
29  unsigned int index1 = uc >> mirror_header_0;
30  if (index1 < mirror_header_1)
31    {
32      int lookup1 = u_mirror.level1[index1];
33      if (lookup1 >= 0)
34        {
35          unsigned int index2 = (uc >> mirror_header_2) & mirror_header_3;
36          int lookup2 = u_mirror.level2[lookup1 + index2];
37          if (lookup2 >= 0)
38            {
39              unsigned int index3 = (uc & mirror_header_4);
40              int lookup3 = u_mirror.level3[lookup2 + index3];
41
42              *puc = uc + lookup3;
43              return (lookup3 != 0);
44            }
45        }
46    }
47  *puc = uc;
48  return false;
49}
50