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diff --git a/sal/textenc/unichars.hxx b/sal/textenc/unichars.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SAL_TEXTENC_UNICHARS_HXX
+#define INCLUDED_SAL_TEXTENC_UNICHARS_HXX
+
+#include <sal/config.h>
+
+#include <cassert>
+
+#include <rtl/character.hxx>
+#include <sal/types.h>
+
+#define RTL_TEXTENC_UNICODE_REPLACEMENT_CHARACTER 0xFFFD
+
+bool ImplIsControlOrFormat(sal_uInt32 nUtf32);
+
+inline bool ImplIsHighSurrogate(sal_uInt32 nUtf32)
+{ return nUtf32 >= 0xD800 && nUtf32 <= 0xDBFF; }
+    // All code points that are high-surrogates, as of Unicode 3.1.1.
+
+inline bool ImplIsLowSurrogate(sal_uInt32 nUtf32)
+{ return nUtf32 >= 0xDC00 && nUtf32 <= 0xDFFF; }
+    // All code points that are low-surrogates, as of Unicode 3.1.1.
+
+bool ImplIsPrivateUse(sal_uInt32 nUtf32);
+
+bool ImplIsZeroWidth(sal_uInt32 nUtf32);
+
+inline sal_uInt32 ImplGetHighSurrogate(sal_uInt32 nUtf32)
+{
+    assert(nUtf32 >= 0x10000);
+    return ((nUtf32 - 0x10000) >> 10) | 0xD800;
+}
+
+inline sal_uInt32 ImplGetLowSurrogate(sal_uInt32 nUtf32)
+{
+    assert(nUtf32 >= 0x10000);
+    return ((nUtf32 - 0x10000) & 0x3FF) | 0xDC00;
+}
+
+inline sal_uInt32 ImplCombineSurrogates(sal_uInt32 nHigh, sal_uInt32 nLow)
+{
+    assert(ImplIsHighSurrogate(nHigh) && ImplIsLowSurrogate(nLow));
+    return (((nHigh & 0x3FF) << 10) | (nLow & 0x3FF)) + 0x10000;
+}
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */