1 files changed, 47 insertions, 0 deletions
diff --git a/lib/unictype/bitmap.h b/lib/unictype/bitmap.h
new file mode 100644
index 0000000..280b298
--- /dev/null
+++ b/lib/unictype/bitmap.h
@@ -0,0 +1,47 @@
+/* Three-level bitmap lookup.
+   Copyright (C) 2000-2002, 2005-2007 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2000-2002.
+
+   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/>.  */
+
+static inline int bitmap_lookup (const void *table, ucs4_t uc);
+
+/* These values are currently hardcoded into gen-ctype.c.  */
+#define header_0 16
+#define header_2 9
+#define header_3 127
+#define header_4 15
+
+static inline int
+bitmap_lookup (const void *table, ucs4_t uc)
+{
+  unsigned int index1 = uc >> header_0;
+  if (index1 < ((const int *) table)[0])
+    {
+      int lookup1 = ((const int *) table)[1 + index1];
+      if (lookup1 >= 0)
+	{
+	  unsigned int index2 = (uc >> header_2) & header_3;
+	  int lookup2 = ((const short *) table)[lookup1 + index2];
+	  if (lookup2 >= 0)
+	    {
+	      unsigned int index3 = (uc >> 5) & header_4;
+	      unsigned int lookup3 = ((const int *) table)[lookup2 + index3];
+
+	      return (lookup3 >> (uc & 0x1f)) & 1;
+	    }
+	}
+    }
+  return 0;
+}