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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
commitfa095a4504cbe668e4244547e2c141597bea4ecf (patch)
tree06135820a286ffec47804e75fbf8a147e92acd2e /lib/uninorm/decomposition-table.h
Imported Upstream version 0.9.1upstream/0.9.1
Diffstat (limited to 'lib/uninorm/decomposition-table.h')
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1 files changed, 48 insertions, 0 deletions
diff --git a/lib/uninorm/decomposition-table.h b/lib/uninorm/decomposition-table.h
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+/* Decomposition of Unicode characters.
+ Copyright (C) 2001-2003, 2009 Free Software Foundation, Inc.
+ Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+ 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 "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 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);
+}