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diff --git a/basic/source/inc/iosys.hxx b/basic/source/inc/iosys.hxx
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+++ b/basic/source/inc/iosys.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_BASIC_SOURCE_INC_IOSYS_HXX
+#define INCLUDED_BASIC_SOURCE_INC_IOSYS_HXX
+
+#include <memory>
+#include <tools/stream.hxx>
+#include <o3tl/typed_flags_set.hxx>
+
+class SvStream;
+
+// Global files (channel numbers 256 to 511) are not
+// implemented at the moment.
+
+#define CHANNELS 256
+
+enum class SbiStreamFlags
+{
+    NONE     = 0x0000,
+    Input    = 0x0001,
+    Output   = 0x0002,
+    Random   = 0x0004,
+    Append   = 0x0008,
+    Binary   = 0x0010,
+};
+namespace o3tl
+{
+    template<> struct typed_flags<SbiStreamFlags> : is_typed_flags<SbiStreamFlags, 0x1f> {};
+}
+
+class SbiStream
+{
+    std::unique_ptr<SvStream> pStrm;
+    sal_uInt64  nExpandOnWriteTo;  // during writing access expand the stream to this size
+    OString aLine;
+    sal_uInt64  nLine;
+    short  nLen;                    // buffer length
+    SbiStreamFlags  nMode;
+    ErrCode nError;
+    void   MapError();
+
+public:
+    SbiStream();
+   ~SbiStream();
+    ErrCode const & Open( const OString&, StreamMode, SbiStreamFlags, short );
+    ErrCode const & Close();
+    ErrCode Read(OString&, sal_uInt16 = 0, bool bForceReadingPerByte=false);
+    ErrCode const & Read( char& );
+    ErrCode Write( const OString& );
+
+    bool IsText() const     { return !bool(nMode & SbiStreamFlags::Binary); }
+    bool IsRandom() const   { return bool(nMode & SbiStreamFlags::Random); }
+    bool IsBinary() const   { return bool(nMode & SbiStreamFlags::Binary); }
+    bool IsSeq() const      { return !bool(nMode & SbiStreamFlags::Random); }
+    bool IsAppend() const   { return bool(nMode & SbiStreamFlags::Append); }
+    short GetBlockLen() const          { return nLen;           }
+    SbiStreamFlags GetMode() const              { return nMode;          }
+    sal_uInt64 GetLine() const            { return nLine;          }
+    void SetExpandOnWriteTo( sal_uInt64 n ) { nExpandOnWriteTo = n;    }
+    void ExpandFile();
+    SvStream* GetStrm()                { return pStrm.get();        }
+};
+
+class SbiIoSystem
+{
+    SbiStream* pChan[ CHANNELS ];
+    OString aPrompt;
+    OString aIn;
+    OUString aOut;
+    short     nChan;
+    ErrCode   nError;
+    void      ReadCon(OString&);
+    void      WriteCon(const OUString&);
+public:
+    SbiIoSystem();
+   ~SbiIoSystem() COVERITY_NOEXCEPT_FALSE;
+    ErrCode GetError();
+    void  Shutdown();
+    void  SetPrompt(const OString& r) { aPrompt = r; }
+    void  SetChannel( short n  )       { nChan = n;   }
+    short GetChannel() const           { return nChan;}
+    void  ResetChannel()               { nChan = 0;   }
+    void  Open( short, const OString&, StreamMode, SbiStreamFlags, short );
+    void  Close();
+    void  Read(OString&);
+    char  Read();
+    void  Write(const OUString&);
+    // 0 == bad channel or no SvStream (nChannel=0..CHANNELS-1)
+    SbiStream* GetStream( short nChannel ) const;
+    void  CloseAll(); // JSM
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */