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diff --git a/include/unotools/streamhelper.hxx b/include/unotools/streamhelper.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_UNOTOOLS_STREAMHELPER_HXX
+#define INCLUDED_UNOTOOLS_STREAMHELPER_HXX
+
+#include <unotools/unotoolsdllapi.h>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <cppuhelper/implbase.hxx>
+#include <tools/stream.hxx>
+#include <mutex>
+#include <utility>
+
+namespace utl
+{
+
+/**
+ * The helper implementation for a using input streams based on SvLockBytes.
+ */
+class UNOTOOLS_DLLPUBLIC OInputStreamHelper final : public cppu::WeakImplHelper<css::io::XInputStream, css::io::XSeekable>
+{
+    std::mutex      m_aMutex;
+    SvLockBytesRef  m_xLockBytes;
+    sal_uInt64      m_nActPos;
+    sal_Int32       m_nAvailable;   // this is typically the chunk(buffer) size
+
+public:
+    OInputStreamHelper(SvLockBytesRef _xLockBytes,
+                       sal_uInt32 _nAvailable)
+        :m_xLockBytes(std::move(_xLockBytes))
+        ,m_nActPos(0)
+        ,m_nAvailable(_nAvailable){}
+
+// css::io::XInputStream
+    virtual sal_Int32 SAL_CALL readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead ) override;
+    virtual sal_Int32 SAL_CALL readSomeBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nMaxBytesToRead ) override;
+    virtual void SAL_CALL skipBytes( sal_Int32 nBytesToSkip ) override;
+    virtual sal_Int32 SAL_CALL available(  ) override;
+    virtual void SAL_CALL closeInput(  ) override;
+
+    virtual void SAL_CALL seek( sal_Int64 location ) override;
+    virtual sal_Int64 SAL_CALL getPosition(  ) override;
+    virtual sal_Int64 SAL_CALL getLength(  ) override;
+
+    // workaround for Ubuntu 18.04 / Fedora 31 (Coverity VM) build with std::mutex; must not be inline!
+    virtual void SAL_CALL acquire() SAL_NOEXCEPT override;
+};
+
+}   // namespace utl
+
+#endif // _UNOTOOLS_STREAM_WRAPPER_HXX_
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */