/* -*- 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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