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diff --git a/sal/textenc/convertsinglebytetobmpunicode.hxx b/sal/textenc/convertsinglebytetobmpunicode.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_CONVERTSINGLEBYTETOBMPUNICODE_HXX
+#define INCLUDED_SAL_TEXTENC_CONVERTSINGLEBYTETOBMPUNICODE_HXX
+
+#include <sal/config.h>
+
+#include <cstddef>
+
+#include <sal/types.h>
+
+
+/// @HTML
+
+namespace rtl::textenc {
+
+/**
+   Maps a range of BMP Unicode code points to individual bytes.
+
+   @see rtl::textenc::BmpUnicodeToSingleByteConverterData
+ */
+struct BmpUnicodeToSingleByteRange {
+    /**
+       The start of the range of BMP Unicode code points.
+     */
+    sal_Unicode unicode;
+
+    /**
+       The extend of the range of BMP Unicode code points.
+
+       <p>The range covers <code>unicode</code> to <code>unicode + range</code>,
+       inclusive.  It is an error if <code>unicode + range</code> is greater
+       than <code>0xFFFF</code>.</p>
+     */
+    sal_uInt8 range;
+
+    /**
+       The start of the corresponding range of individual bytes.
+
+       <p>It is an error if <code>byte + range</code> is greater than
+       <code>0xFF</code>.</p>
+     */
+    sal_uInt8 byte;
+};
+
+/**
+   Data to convert between BMP Unicode and a single-byte character set.
+
+   <p>Only supports conversions where each legal unit from the single-byte
+   character set has one or more mappings to individual BMP Unicode code points
+   that are neither noncharacters nor surrogates.</p>
+
+   @see rtl_textenc_convertSingleByteToBmpUnicode
+   @see rtl_textenc_convertBmpUnicodeToSingleByte
+ */
+struct BmpUnicodeToSingleByteConverterData {
+    /**
+       Mapping from the single-byte character set to BMP Unicode code points.
+
+       <p>Illegal units from the single-byte character set are mapped to
+       <code>0xFFFF</code>.</p>
+     */
+    sal_Unicode byteToUnicode[256];
+
+    /**
+       The number of Unicode-to-byte conversion ranges.
+     */
+    std::size_t unicodeToByteEntries;
+
+    /**
+       The array of Unicode-to-byte conversion ranges, sorted by increasing
+       <code>unicode</code> values.
+
+       <p>The ranges may not overlap.</p>
+     */
+    BmpUnicodeToSingleByteRange const * unicodeToByte;
+};
+
+}
+
+/**
+   Function to convert from a single-byte character set to BMP Unicode.
+
+   @see ImplConvertToUnicodeProc
+ */
+sal_Size rtl_textenc_convertSingleByteToBmpUnicode(
+    void const * data, void * context, char const * srcBuf,
+    sal_Size srcBytes, sal_Unicode * destBuf, sal_Size destChars,
+    sal_uInt32 flags, sal_uInt32 * info, sal_Size * srcCvtBytes);
+
+/**
+   Function to convert from BMP Unicode to a single-byte character set.
+
+   @see ImplConvertToTextProc
+ */
+sal_Size rtl_textenc_convertBmpUnicodeToSingleByte(
+    void const * data, void * context,
+    sal_Unicode const * srcBuf, sal_Size srcChars, char * destBuf,
+    sal_Size destBytes, sal_uInt32 flags, sal_uInt32 * info,
+    sal_Size * srcCvtChars);
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */