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/* Decomposition of Unicode characters.
Copyright (C) 2001-2003, 2009-2022 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/>. */
#include "unitypes.h"
/* The decomposition table is made of two parts:
- A table containing the actual arrays of decomposed equivalents.
(This table is separate because the maximum length of a decomposition
is 18, much larger than the average length 1.497 of a decomposition).
- A 3-level table of indices into this array. */
#include "decomposition-table1.h"
static inline unsigned short
decomp_index (ucs4_t uc)
{
unsigned int index1 = uc >> decomp_header_0;
if (index1 < decomp_header_1)
{
int lookup1 = gl_uninorm_decomp_index_table.level1[index1];
if (lookup1 >= 0)
{
unsigned int index2 = (uc >> decomp_header_2) & decomp_header_3;
int lookup2 = gl_uninorm_decomp_index_table.level2[lookup1 + index2];
if (lookup2 >= 0)
{
unsigned int index3 = uc & decomp_header_4;
return gl_uninorm_decomp_index_table.level3[lookup2 + index3];
}
}
}
return (unsigned short)(-1);
}
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