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/* Arabic joining group of Unicode characters.
Copyright (C) 2011-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2011.
This program 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 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
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 <http://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 =
((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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