/* Mirrored Unicode characters.

   Copyright (C) 2002, 2006, 2009-2017 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2002.

   This program is free software: you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published

   by the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT 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

   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */

#include "unictype.h"

/* Define u_mirror table.  */

#include "mirror.h"

bool

uc_mirror_char (ucs4_t uc, ucs4_t *puc)

{

  unsigned int index1 = uc >> mirror_header_0;

  if (index1 < mirror_header_1)

    {

      int lookup1 = u_mirror.level1[index1];

      if (lookup1 >= 0)

        {

          unsigned int index2 = (uc >> mirror_header_2) & mirror_header_3;

          int lookup2 = u_mirror.level2[lookup1 + index2];

          if (lookup2 >= 0)

            {

              unsigned int index3 = (uc & mirror_header_4);

              int lookup3 = u_mirror.level3[lookup2 + index3];

              *puc = uc + lookup3;

              return (lookup3 != 0);

            }

        }

    }

  *puc = uc;

  return false;

}