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diff --git a/package/inc/ByteGrabber.hxx b/package/inc/ByteGrabber.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_PACKAGE_INC_BYTEGRABBER_HXX
+#define INCLUDED_PACKAGE_INC_BYTEGRABBER_HXX
+
+#include <com/sun/star/uno/Sequence.h>
+#include <com/sun/star/uno/Reference.h>
+
+#include <mutex>
+
+namespace com::sun::star {
+    namespace io { class XSeekable; class XInputStream; }
+}
+class ByteGrabber final
+{
+    std::mutex m_aMutex;
+
+    css::uno::Reference < css::io::XInputStream > xStream;
+    css::uno::Reference < css::io::XSeekable > xSeek;
+    css::uno::Sequence < sal_Int8 > aSequence;
+    const sal_Int8 *pSequence;
+
+public:
+    ByteGrabber (css::uno::Reference < css::io::XInputStream > const & xIstream);
+    ~ByteGrabber();
+
+    void setInputStream (const css::uno::Reference < css::io::XInputStream >& xNewStream);
+    // XInputStream
+    /// @throws css::io::NotConnectedException
+    /// @throws css::io::BufferSizeExceededException
+    /// @throws css::io::IOException
+    /// @throws css::uno::RuntimeException
+    sal_Int32 readBytes( css::uno::Sequence< sal_Int8 >& aData, sal_Int32 nBytesToRead );
+    // XSeekable
+    /// @throws css::lang::IllegalArgumentException
+    /// @throws css::io::IOException
+    /// @throws css::uno::RuntimeException
+    void seek( sal_Int64 location );
+    /// @throws css::io::IOException
+    /// @throws css::uno::RuntimeException
+    sal_Int64 getPosition(  );
+    /// @throws css::io::IOException
+    /// @throws css::uno::RuntimeException
+    sal_Int64 getLength(  );
+
+    sal_uInt16 ReadUInt16();
+    sal_uInt32 ReadUInt32();
+    sal_Int16 ReadInt16()
+    {
+        return static_cast<sal_Int16>(ReadUInt16());
+    }
+    sal_Int32 ReadInt32()
+    {
+        return static_cast<sal_Int32>(ReadUInt32());
+    }
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */