/* -*- 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 .

 */

#include "filrec.hxx"

namespace fileaccess {

void ReconnectingFile::disconnect()

{

    m_aFile.close();

    m_bDisconnect = true;

}

bool ReconnectingFile::reconnect()

{

    bool bResult = false;

    if ( m_bFlagsSet )

    {

        disconnect();

        if ( m_aFile.open( m_nFlags ) == ::osl::FileBase::E_None

          || m_aFile.open( osl_File_OpenFlag_Read ) == ::osl::FileBase::E_None )

        {

            m_bDisconnect = false;

            bResult = true;

        }

    }

    return bResult;

}

::osl::FileBase::RC ReconnectingFile::open( sal_uInt32 uFlags )

{

    ::osl::FileBase::RC nResult = m_aFile.open( uFlags );

    if ( nResult == ::osl::FileBase::E_None )

    {

        if ( uFlags & osl_File_OpenFlag_Create )

            m_nFlags = (uFlags & ( ~osl_File_OpenFlag_Create )) | osl_File_OpenFlag_Write;

        else

            m_nFlags = uFlags;

        m_bFlagsSet = true;

    }

    return nResult;

}

::osl::FileBase::RC ReconnectingFile::close()

{

    m_nFlags = 0;

    m_bFlagsSet = false;

    m_bDisconnect = false;

    return m_aFile.close();

}

::osl::FileBase::RC ReconnectingFile::setPos( sal_uInt32 uHow, sal_Int64 uPos )

{

    ::osl::FileBase::RC nRes = ::osl::FileBase::E_NETWORK;

    if ( uHow == osl_Pos_Absolut && uPos > 0 )

    {

        if ( m_bDisconnect )

        {

            if ( reconnect() )

                nRes = m_aFile.setPos( uHow, uPos );

        }

        else

        {

            // E_INVAL error code means in this case that

            // the file handler is invalid

            nRes = m_aFile.setPos( uHow, uPos );

            if ( ( nRes == ::osl::FileBase::E_NETWORK

                || nRes == ::osl::FileBase::E_INVAL )

              && reconnect() )

                nRes = m_aFile.setPos( uHow, uPos );

        }

    }

    else

    {

        if ( !m_bDisconnect )

            nRes = m_aFile.setPos( uHow, uPos );

    }

    return nRes;

}

::osl::FileBase::RC ReconnectingFile::getPos( sal_uInt64& uPos )

{

    if ( m_bDisconnect )

        return ::osl::FileBase::E_NETWORK;

    return m_aFile.getPos( uPos );

}

::osl::FileBase::RC ReconnectingFile::setSize( sal_uInt64 uSize )

{

    ::osl::FileBase::RC nRes = ::osl::FileBase::E_NETWORK;

    if ( uSize == 0 )

    {

        if ( m_bDisconnect )

        {

            if ( reconnect() )

                nRes = m_aFile.setSize( uSize );

        }

        else

        {

            // E_INVAL error code means in this case that

            // the file handler is invalid

            nRes = m_aFile.setSize( uSize );

            if ( ( nRes == ::osl::FileBase::E_NETWORK

                || nRes == ::osl::FileBase::E_INVAL )

              && reconnect() )

                nRes = m_aFile.setSize( uSize );

        }

    }

    else

    {

        if ( !m_bDisconnect )

            nRes = m_aFile.setSize( uSize );

    }

    return nRes;

}

::osl::FileBase::RC ReconnectingFile::getSize( sal_uInt64 &rSize )

{

    ::osl::FileBase::RC nRes = ::osl::FileBase::E_NETWORK;

    if ( !m_bDisconnect )

        nRes = m_aFile.getSize( rSize );

    // E_INVAL error code means in this case that

    // the file handler is invalid

    if ( ( nRes == ::osl::FileBase::E_NETWORK

        || nRes == ::osl::FileBase::E_INVAL )

      && reconnect() )

    {

        nRes = m_aFile.getSize( rSize );

        // the repairing should be disconnected, since the position might be wrong

        // but the result should be retrieved

        disconnect();

    }

    return nRes;

}

::osl::FileBase::RC ReconnectingFile::read( void *pBuffer, sal_uInt64 uBytesRequested, sal_uInt64& rBytesRead )

{

    if ( m_bDisconnect )

        return ::osl::FileBase::E_NETWORK;

    return m_aFile.read( pBuffer, uBytesRequested, rBytesRead );

}

::osl::FileBase::RC ReconnectingFile::write(const void *pBuffer, sal_uInt64 uBytesToWrite, sal_uInt64& rBytesWritten)

{

    if ( m_bDisconnect )

        return ::osl::FileBase::E_NETWORK;

    return m_aFile.write( pBuffer, uBytesToWrite, rBytesWritten );

}

::osl::FileBase::RC ReconnectingFile::sync() const

{

    if ( m_bDisconnect )

        return ::osl::FileBase::E_NETWORK;

    return m_aFile.sync();

}

} // namespace fileaccess

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