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/* Simple case mapping for Unicode characters.
Copyright (C) 2002, 2006, 2009-2023 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU 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;
}
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