Drop unused header

Found while cleaning up unotools with IWYU
The same OStreamSection class is is implemented in comphelper
about since 2c23e695 (this was in 2000!)

Change-Id: I464ece9ff84536d5332caa0f285856d3fe358e5b
Reviewed-on: https://gerrit.libreoffice.org/62470
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>

include/unotools/streamsection.hxx

-/* -*- 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_STREAMSECTION_HXX
-#define INCLUDED_UNOTOOLS_STREAMSECTION_HXX
-
-#include <com/sun/star/io/XMarkableStream.hpp>
-#include <com/sun/star/io/XDataInputStream.hpp>
-#include <com/sun/star/io/XDataOutputStream.hpp>
-
-namespace utl
-{
-
-/** implements handling for compatibly reading/writing data from/into an input/output stream.
-    data written in a block secured by this class should be readable by older versions which
-    use the same mechanism.
-*/
-
-class OStreamSection
-{
-    css::uno::Reference< css::io::XMarkableStream >       m_xMarkStream;
-    css::uno::Reference< css::io::XDataInputStream >      m_xInStream;
-    css::uno::Reference< css::io::XDataOutputStream >     m_xOutStream;
-
-    sal_Int32   m_nBlockStart;
-    sal_Int32   m_nBlockLen;
-
-public:
-    /** starts reading of a "skippable" section of data within the given input stream<BR>
-        @param      _rxInput    the stream to read from. Must support the
-                                css::io::XMarkableStream interface
-    */
-    OStreamSection(const css::uno::Reference< css::io::XDataInputStream >& _rxInput);
-
-    /** starts writing of a "skippable" section of data into the given output stream
-        @param      _rxOutput           the stream the stream to write to. Must support the
-                                        css::io::XMarkableStream interface
-        @param      _nPresumedLength    estimation for the length of the upcoming section. If greater 0, this
-                                        value will be written as section length and corrected (in the dtor) only if
-                                        needed. If you know how much bytes you are about to write, you may
-                                        want to use this param, saving some stream operations this way.
-    */
-    OStreamSection(const css::uno::Reference< css::io::XDataOutputStream >& _rxOutput, sal_Int32 _nPresumedLength = 0);
-
-    /** dtor. <BR>If constructed for writing, the section "opened" by this object will be "closed".<BR>
-        If constructed for reading, any remaining bytes 'til the end of the section will be skipped.
-    */
-    ~OStreamSection();
-};
-
-}   // namespace utl
-
-#endif // INCLUDED_UNOTOOLS_STREAMSECTION_HXX
-
-/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

solenv/clang-format/blacklist

@@ -7859,7 +7859,6 @@ include/unotools/searchopt.hxx
 include/unotools/securityoptions.hxx
 include/unotools/sharedunocomponent.hxx
 include/unotools/streamhelper.hxx
-include/unotools/streamsection.hxx
 include/unotools/streamwrap.hxx
 include/unotools/syslocale.hxx
 include/unotools/syslocaleoptions.hxx