/* -*- 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_COMPHELPER_STREAMSECTION_HXX
#define INCLUDED_COMPHELPER_STREAMSECTION_HXX

#include <config_options.h>
#include <com/sun/star/uno/Reference.h>
#include <comphelper/comphelperdllapi.h>

namespace com::sun::star::io
{
class XDataInputStream;
}
namespace com::sun::star::io
{
class XDataOutputStream;
}
namespace com::sun::star::io
{
class XMarkableStream;
}

namespace comphelper
{
/** 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 UNLESS_MERGELIBS(COMPHELPER_DLLPUBLIC) 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
    */
    OStreamSection(const css::uno::Reference<css::io::XDataOutputStream>& _rxOutput);

    /** 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 comphelper

#endif // INCLUDED_COMPHELPER_STREAMSECTION_HXX

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