49 lines
1.7 KiB
C
49 lines
1.7 KiB
C
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/* Three-level bitmap lookup.
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Copyright (C) 2000-2002, 2005-2007, 2009-2023 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2000-2002.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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static inline int bitmap_lookup (const void *table, ucs4_t uc);
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/* These values are currently hardcoded into gen-uni-tables.c, function
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output_predicate(). */
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#define header_0 16
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#define header_2 9
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#define header_3 127
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#define header_4 15
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static inline int
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bitmap_lookup (const void *table, ucs4_t uc)
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{
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unsigned int index1 = uc >> header_0;
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if (index1 < ((const int *) table)[0])
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{
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int lookup1 = ((const int *) table)[1 + index1];
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if (lookup1 >= 0)
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{
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unsigned int index2 = (uc >> header_2) & header_3;
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int lookup2 = ((const short *) table)[lookup1 + index2];
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if (lookup2 >= 0)
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{
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unsigned int index3 = (uc >> 5) & header_4;
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unsigned int lookup3 = ((const unsigned int *) table)[lookup2 + index3];
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return (lookup3 >> (uc & 0x1f)) & 1;
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}
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}
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}
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return 0;
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}
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