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diff --git a/extensions/spellcheck/hunspell/src/csutil.hxx b/extensions/spellcheck/hunspell/src/csutil.hxx
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+++ b/extensions/spellcheck/hunspell/src/csutil.hxx
@@ -0,0 +1,327 @@
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * Copyright (C) 2002-2017 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 ***** */
+/*
+ * Copyright 2002 Kevin B. Hendricks, Stratford, Ontario, Canada
+ * And Contributors.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. All modifications to the source code must be clearly marked as
+ *    such.  Binary redistributions based on modified source code
+ *    must be clearly marked as modified versions in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY KEVIN B. HENDRICKS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
+ * KEVIN B. HENDRICKS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef CSUTIL_HXX_
+#define CSUTIL_HXX_
+
+#include "hunvisapi.h"
+
+// First some base level utility routines
+
+#include <fstream>
+#include <string>
+#include <vector>
+#include <string.h>
+#include "w_char.hxx"
+#include "htypes.hxx"
+
+#ifdef MOZILLA_CLIENT
+#include "nscore.h"  // for mozalloc headers
+#endif
+
+// casing
+#define NOCAP 0
+#define INITCAP 1
+#define ALLCAP 2
+#define HUHCAP 3
+#define HUHINITCAP 4
+
+// default encoding and keystring
+#define SPELL_ENCODING "ISO8859-1"
+#define SPELL_KEYSTRING "qwertyuiop|asdfghjkl|zxcvbnm"
+
+// default morphological fields
+#define MORPH_STEM "st:"
+#define MORPH_ALLOMORPH "al:"
+#define MORPH_POS "po:"
+#define MORPH_DERI_PFX "dp:"
+#define MORPH_INFL_PFX "ip:"
+#define MORPH_TERM_PFX "tp:"
+#define MORPH_DERI_SFX "ds:"
+#define MORPH_INFL_SFX "is:"
+#define MORPH_TERM_SFX "ts:"
+#define MORPH_SURF_PFX "sp:"
+#define MORPH_FREQ "fr:"
+#define MORPH_PHON "ph:"
+#define MORPH_HYPH "hy:"
+#define MORPH_PART "pa:"
+#define MORPH_FLAG "fl:"
+#define MORPH_HENTRY "_H:"
+#define MORPH_TAG_LEN strlen(MORPH_STEM)
+
+#define MSEP_FLD ' '
+#define MSEP_REC '\n'
+#define MSEP_ALT '\v'
+
+// default flags
+#define DEFAULTFLAGS 65510
+#define FORBIDDENWORD 65510
+#define ONLYUPCASEFLAG 65511
+
+// fix long pathname problem of WIN32 by using w_char std::fstream::open override
+LIBHUNSPELL_DLL_EXPORTED void myopen(std::ifstream& stream, const char* path,
+                                     std::ios_base::openmode mode);
+
+// convert UTF-16 characters to UTF-8
+LIBHUNSPELL_DLL_EXPORTED std::string& u16_u8(std::string& dest,
+                                             const std::vector<w_char>& src);
+
+// convert UTF-8 characters to UTF-16
+LIBHUNSPELL_DLL_EXPORTED int u8_u16(std::vector<w_char>& dest,
+                                    const std::string& src);
+
+// remove end of line char(s)
+LIBHUNSPELL_DLL_EXPORTED void mychomp(std::string& s);
+
+// duplicate string
+LIBHUNSPELL_DLL_EXPORTED char* mystrdup(const char* s);
+
+// parse into tokens with char delimiter
+LIBHUNSPELL_DLL_EXPORTED std::string::const_iterator mystrsep(const std::string &str,
+                                                              std::string::const_iterator& start);
+
+// replace pat by rep in word and return word
+LIBHUNSPELL_DLL_EXPORTED std::string& mystrrep(std::string& str,
+                                               const std::string& search,
+                                               const std::string& replace);
+
+// append s to ends of every lines in text
+LIBHUNSPELL_DLL_EXPORTED std::string& strlinecat(std::string& str,
+                                                 const std::string& apd);
+
+// tokenize into lines with new line
+LIBHUNSPELL_DLL_EXPORTED std::vector<std::string> line_tok(const std::string& text,
+                                                           char breakchar);
+
+// tokenize into lines with new line and uniq in place
+LIBHUNSPELL_DLL_EXPORTED void line_uniq(std::string& text, char breakchar);
+
+LIBHUNSPELL_DLL_EXPORTED void line_uniq_app(std::string& text, char breakchar);
+
+// reverse word
+LIBHUNSPELL_DLL_EXPORTED size_t reverseword(std::string& word);
+
+// reverse word
+LIBHUNSPELL_DLL_EXPORTED size_t reverseword_utf(std::string&);
+
+// remove duplicates
+LIBHUNSPELL_DLL_EXPORTED void uniqlist(std::vector<std::string>& list);
+
+// character encoding information
+struct cs_info {
+  unsigned char ccase;
+  unsigned char clower;
+  unsigned char cupper;
+};
+
+LIBHUNSPELL_DLL_EXPORTED void initialize_utf_tbl();
+LIBHUNSPELL_DLL_EXPORTED void free_utf_tbl();
+LIBHUNSPELL_DLL_EXPORTED unsigned short unicodetoupper(unsigned short c,
+                                                       int langnum);
+LIBHUNSPELL_DLL_EXPORTED w_char upper_utf(w_char u, int langnum);
+LIBHUNSPELL_DLL_EXPORTED w_char lower_utf(w_char u, int langnum);
+LIBHUNSPELL_DLL_EXPORTED unsigned short unicodetolower(unsigned short c,
+                                                       int langnum);
+LIBHUNSPELL_DLL_EXPORTED int unicodeisalpha(unsigned short c);
+
+LIBHUNSPELL_DLL_EXPORTED struct cs_info* get_current_cs(const std::string& es);
+
+// get language identifiers of language codes
+LIBHUNSPELL_DLL_EXPORTED int get_lang_num(const std::string& lang);
+
+// get characters of the given 8bit encoding with lower- and uppercase forms
+LIBHUNSPELL_DLL_EXPORTED std::string get_casechars(const char* enc);
+
+// convert std::string to all caps
+LIBHUNSPELL_DLL_EXPORTED std::string& mkallcap(std::string& s,
+                                               const struct cs_info* csconv);
+
+// convert null terminated string to all little
+LIBHUNSPELL_DLL_EXPORTED std::string& mkallsmall(std::string& s,
+                                                 const struct cs_info* csconv);
+
+// convert first letter of string to little
+LIBHUNSPELL_DLL_EXPORTED std::string& mkinitsmall(std::string& s,
+                                                 const struct cs_info* csconv);
+
+// convert first letter of string to capital
+LIBHUNSPELL_DLL_EXPORTED std::string& mkinitcap(std::string& s,
+                                                const struct cs_info* csconv);
+
+// convert first letter of UTF-8 string to capital
+LIBHUNSPELL_DLL_EXPORTED std::vector<w_char>&
+mkinitcap_utf(std::vector<w_char>& u, int langnum);
+
+// convert UTF-8 string to little
+LIBHUNSPELL_DLL_EXPORTED std::vector<w_char>&
+mkallsmall_utf(std::vector<w_char>& u, int langnum);
+
+// convert first letter of UTF-8 string to little
+LIBHUNSPELL_DLL_EXPORTED std::vector<w_char>&
+mkinitsmall_utf(std::vector<w_char>& u, int langnum);
+
+// convert UTF-8 string to capital
+LIBHUNSPELL_DLL_EXPORTED std::vector<w_char>&
+mkallcap_utf(std::vector<w_char>& u, int langnum);
+
+// get type of capitalization
+LIBHUNSPELL_DLL_EXPORTED int get_captype(const std::string& q, cs_info*);
+
+// get type of capitalization (UTF-8)
+LIBHUNSPELL_DLL_EXPORTED int get_captype_utf8(const std::vector<w_char>& q, int langnum);
+
+// strip all ignored characters in the string
+LIBHUNSPELL_DLL_EXPORTED size_t remove_ignored_chars_utf(
+    std::string& word,
+    const std::vector<w_char>& ignored_chars);
+
+// strip all ignored characters in the string
+LIBHUNSPELL_DLL_EXPORTED size_t remove_ignored_chars(
+    std::string& word,
+    const std::string& ignored_chars);
+
+LIBHUNSPELL_DLL_EXPORTED bool parse_string(const std::string& line,
+                                           std::string& out,
+                                           int ln);
+
+LIBHUNSPELL_DLL_EXPORTED bool parse_array(const std::string& line,
+                                          std::string& out,
+                                          std::vector<w_char>& out_utf16,
+                                          int utf8,
+                                          int ln);
+
+LIBHUNSPELL_DLL_EXPORTED int fieldlen(const char* r);
+
+LIBHUNSPELL_DLL_EXPORTED bool copy_field(std::string& dest,
+                                         const std::string& morph,
+                                         const std::string& var);
+
+// conversion function for protected memory
+LIBHUNSPELL_DLL_EXPORTED void store_pointer(char* dest, char* source);
+
+// conversion function for protected memory
+LIBHUNSPELL_DLL_EXPORTED char* get_stored_pointer(const char* s);
+
+
+// to avoid unnecessary string copies and Unicode conversions
+// we simply check the ignored_chars characters in the word
+// (in the case of UTF-8 encoded strings, "false" means
+// "likely false", if ignored_chars characters are not ASCII)
+inline bool has_no_ignored_chars(const std::string& word,
+                            const std::string& ignored_chars) {
+  for (std::string::const_iterator it = ignored_chars.begin(), end = ignored_chars.end(); it != end; ++it)
+    if (word.find(*it) != std::string::npos)
+      return false;
+  return true;
+}
+
+// hash entry macros
+inline char* HENTRY_DATA(struct hentry* h) {
+  char* ret;
+  if (!(h->var & H_OPT))
+    ret = NULL;
+  else if (h->var & H_OPT_ALIASM)
+    ret = get_stored_pointer(HENTRY_WORD(h) + h->blen + 1);
+  else
+    ret = HENTRY_WORD(h) + h->blen + 1;
+  return ret;
+}
+
+inline const char* HENTRY_DATA(
+    const struct hentry* h) {
+  const char* ret;
+  if (!(h->var & H_OPT))
+    ret = NULL;
+  else if (h->var & H_OPT_ALIASM)
+    ret = get_stored_pointer(HENTRY_WORD(h) + h->blen + 1);
+  else
+    ret = HENTRY_WORD(h) + h->blen + 1;
+  return ret;
+}
+
+// NULL-free version for warning-free OOo build
+inline const char* HENTRY_DATA2(
+    const struct hentry* h) {
+  const char* ret;
+  if (!(h->var & H_OPT))
+    ret = "";
+  else if (h->var & H_OPT_ALIASM)
+    ret = get_stored_pointer(HENTRY_WORD(h) + h->blen + 1);
+  else
+    ret = HENTRY_WORD(h) + h->blen + 1;
+  return ret;
+}
+
+inline char* HENTRY_FIND(struct hentry* h,
+                                                  const char* p) {
+  return (HENTRY_DATA(h) ? strstr(HENTRY_DATA(h), p) : NULL);
+}
+
+#endif