/* Simple case mapping for Unicode characters.

   Copyright (C) 2002, 2006, 2009-2025 Free Software Foundation, Inc.

   Written by Bruno Haible <bruno@clisp.org>, 2009.

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

   it under the terms of the GNU Lesser General Public License as

   published by the Free Software Foundation; either version 2.1 of the

   License, or (at your option) any later version.

   This file 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 Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License

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

ucs4_t

FUNC (ucs4_t uc)

{

  unsigned int index1 = uc >> mapping_header_0;

  if (index1 < mapping_header_1)

    {

      int lookup1 = u_mapping.level1[index1];

      if (lookup1 >= 0)

        {

          unsigned int index2 = (uc >> mapping_header_2) & mapping_header_3;

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

          if (lookup2 >= 0)

            {

              unsigned int index3 = (uc & mapping_header_4);

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

              return uc + lookup3;

            }

        }

    }

  return uc;

}