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diff --git a/extensions/spellcheck/hunspell/src/htypes.hxx b/extensions/spellcheck/hunspell/src/htypes.hxx
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+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * Copyright (C) 2002-2022 Németh László
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * Hunspell is based on MySpell which is Copyright (C) 2002 Kevin Hendricks.
+ *
+ * Contributor(s): David Einstein, Davide Prina, Giuseppe Modugno,
+ * Gianluca Turconi, Simon Brouwer, Noll János, Bíró Árpád,
+ * Goldman Eleonóra, Sarlós Tamás, Bencsáth Boldizsár, Halácsy Péter,
+ * Dvornik László, Gefferth András, Nagy Viktor, Varga Dániel, Chris Halls,
+ * Rene Engelhard, Bram Moolenaar, Dafydd Jones, Harri Pitkänen
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#ifndef HTYPES_HXX_
+#define HTYPES_HXX_
+
+#define ROTATE_LEN 5
+
+#define ROTATE(v, q) \
+  (v) = ((v) << (q)) | (((v) >> (32 - q)) & ((1 << (q)) - 1));
+
+// hentry options
+#define H_OPT (1 << 0)          // is there optional morphological data?
+#define H_OPT_ALIASM (1 << 1)   // using alias compression?
+#define H_OPT_PHON (1 << 2)     // is there ph: field in the morphological data?
+#define H_OPT_INITCAP (1 << 3)  // is dictionary word capitalized?
+
+// see also csutil.hxx
+#define HENTRY_WORD(h) &(h->word[0])
+
+// approx. number  of user defined words
+#define USERWORD 1000
+
+#if __cplusplus >= 201103L || (defined(_MSC_VER) && _MSC_VER >= 1900)
+#  define HUNSPELL_THREAD_LOCAL thread_local
+#else
+#  define HUNSPELL_THREAD_LOCAL static
+#endif
+
+struct hentry {
+  unsigned char blen;    // word length in bytes
+  unsigned char clen;    // word length in characters (different for UTF-8 enc.)
+  short alen;            // length of affix flag vector
+  unsigned short* astr;  // affix flag vector
+  struct hentry* next;   // next word with same hash code
+  struct hentry* next_homonym;  // next homonym word (with same hash code)
+  char var;      // bit vector of H_OPT hentry options
+  char word[1];  // variable-length word (8-bit or UTF-8 encoding)
+};
+
+#endif