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/* Arabic joining group of Unicode characters.
Copyright (C) 2011-2022 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2011.
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/>. */
#include <config.h>
/* Specification. */
#include "unictype.h"
/* Define u_joining_group table. */
#include "joininggroup_of.h"
int
uc_joining_group (ucs4_t uc)
{
unsigned int index1 = uc >> joining_group_header_0;
if (index1 < joining_group_header_1)
{
int lookup1 = u_joining_group.level1[index1];
if (lookup1 >= 0)
{
unsigned int index2 = (uc >> joining_group_header_2) & joining_group_header_3;
int lookup2 = u_joining_group.level2[lookup1 + index2];
if (lookup2 >= 0)
{
unsigned int index3 = ((uc & joining_group_header_4) + lookup2) * 7;
/* level3 contains 7-bit values, packed into 16-bit words. */
unsigned int lookup3 =
(((unsigned int) u_joining_group.level3[index3>>4]
| ((unsigned int) u_joining_group.level3[(index3>>4)+1] << 16))
>> (index3 % 16))
& 0x7f;
return lookup3;
}
}
}
return UC_JOINING_GROUP_NONE;
}
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