1 files changed, 57 insertions, 0 deletions
diff --git a/lib/unistring/uninorm/decomposition-table.h b/lib/unistring/uninorm/decomposition-table.h
new file mode 100644
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+++ b/lib/unistring/uninorm/decomposition-table.h
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+/* Decomposition of Unicode characters.
+   Copyright (C) 2001-2003, 2009-2021 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 either:
+
+     * 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.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+   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 <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);
+}