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diff --git a/src/latin1literal.h b/src/latin1literal.h
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+/***************************************************************************
+    copyright            : (C) 2003-2006 by Robby Stephenson
+    email                : robby@periapsis.org
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This file has been modified to match the requirements of KBibTeX.     *
+ *   In case of problems or bugs arising from this implementation, please  *
+ *   contact the KBibTeX team first.                                       *
+ *                             Thomas Fischer <fischer@unix-ag.uni-kl.de>  *
+ *                                                                         *
+ ***************************************************************************/
+
+/***************************************************************************
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of version 2 of the GNU General Public License as  *
+ *   published by the Free Software Foundation;                            *
+ *                                                                         *
+ ***************************************************************************/
+
+// this code was original published to the kde-core-devel email list
+// copyright 2003 Harri Porten <porten@kde.org>
+// Originally licensed under LGPL, included here under GPL v2
+
+#ifndef LATIN1LITERAL_H
+#define LATIN1LITERAL_H
+
+#include <qstring.h>
+
+namespace KBibTeX {
+
+/**
+ * A class for explicit marking of string literals encoded in the ISO
+ * 8859-1 character set. Allows for efficient, still (in terms of the
+ * chosen encoding) safe comparison with QString instances. To be used
+ * like this:
+ *
+ * \code
+ *     QString s = .....
+ *     if (s == Latin1Literal("o")) { ..... }
+ * \endcode
+ *
+ */
+#define Latin1Literal(s) \
+    KBibTeX::Latin1LiteralInternal((s), sizeof(s)/sizeof(char)-1)
+
+class Latin1LiteralInternal {
+
+public:
+  Latin1LiteralInternal(const char* s, size_t l)
+    : str(s), len(s ? l : (size_t)-1) { }
+
+  // this is lazy, leave these public since I can't figure out
+  // how to declare a friend function that works for gcc 2.95
+  const char* str;
+  size_t len;
+};
+
+} // end namespace
+
+inline
+bool operator==(const QString& s1, const KBibTeX::Latin1LiteralInternal& s2) {
+  const QChar* uc = s1.unicode();
+  const char* c = s2.str;
+  if(!c || !uc) {
+    return (!c && !uc);
+  }
+
+  const size_t& l = s2.len;
+  if(s1.length() != l) {
+    return false;
+  }
+
+  for(size_t i = 0; i < l; ++i, ++uc, ++c) {
+    if(uc->unicode() != static_cast<uchar>(*c)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+inline
+bool operator!=(const QString& s1, const KBibTeX::Latin1LiteralInternal& s2) {
+  return !(s1 == s2);
+}
+
+inline
+bool operator==(const KBibTeX::Latin1LiteralInternal& s1, const QString& s2) {
+  return s2 == s1;
+}
+
+inline
+bool operator!=(const KBibTeX::Latin1LiteralInternal& s1, const QString& s2) {
+  return !(s2 == s1);
+}
+
+#endif