1 /* Three-level bitmap lookup.
2 Copyright (C) 2000-2002, 2005-2007, 2009-2014 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2000-2002.
5 This program is free software: you can redistribute it and/or modify it
6 under the terms of the GNU Lesser General Public License as published
7 by the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
18 static inline int identsyntax_lookup (ucs4_t uc);
21 identsyntax_lookup (ucs4_t uc)
23 unsigned int index1 = uc >> identsyntax_header_0;
24 if (index1 < identsyntax_header_1)
26 int lookup1 = TABLE.level1[index1];
29 unsigned int index2 = (uc >> identsyntax_header_2) & identsyntax_header_3;
30 int lookup2 = TABLE.level2[lookup1 + index2];
33 unsigned int index3 = (uc & identsyntax_header_4) + lookup2;
34 /* level3 contains 2-bit values. */
35 unsigned int lookup3 = TABLE.level3[index3 >> 3];
37 return (lookup3 >> (2 * (index3 & 7))) & 3;
41 return UC_IDENTIFIER_INVALID;