1 files changed, 47 insertions, 0 deletions
diff --git a/lib/unicase/simple-mapping.h b/lib/unicase/simple-mapping.h
new file mode 100644
index 0000000..d3a8013
--- /dev/null
+++ b/lib/unicase/simple-mapping.h
@@ -0,0 +1,47 @@
+/* Simple case mapping for Unicode characters.
+   Copyright (C) 2002, 2006, 2009-2022 Free Software Foundation, Inc.
+   Written by Bruno Haible <bruno@clisp.org>, 2009.
+
+   This file is free software.
+   It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
+   You can redistribute it and/or modify it under either
+     - the terms of the GNU Lesser General Public License as published
+       by the Free Software Foundation, either version 3, or (at your
+       option) any later version, or
+     - the terms of the GNU General Public License as published by the
+       Free Software Foundation; either version 2, or (at your option)
+       any later version, or
+     - the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
+
+   This file 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 and the GNU General Public License
+   for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License and of the GNU General Public License along with this
+   program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+ucs4_t
+FUNC (ucs4_t uc)
+{
+  unsigned int index1 = uc >> mapping_header_0;
+  if (index1 < mapping_header_1)
+    {
+      int lookup1 = u_mapping.level1[index1];
+      if (lookup1 >= 0)
+        {
+          unsigned int index2 = (uc >> mapping_header_2) & mapping_header_3;
+          int lookup2 = u_mapping.level2[lookup1 + index2];
+          if (lookup2 >= 0)
+            {
+              unsigned int index3 = (uc & mapping_header_4);
+              int lookup3 = u_mapping.level3[lookup2 + index3];
+
+              return uc + lookup3;
+            }
+        }
+    }
+  return uc;
+}