//
// LDASTools frameCPP - A library implementing the LIGO/Virgo frame
// specification
//
// Copyright (C) 2018 California Institute of Technology
//
// LDASTools frameCPP is free software; you may redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 (GPLv2) of the
// License or at your discretion, any later version.
//
// LDASTools frameCPP is distributed in the hope that it will be useful, but
// without any warranty or even the implied warranty of merchantability
// or fitness for a particular purpose. See the GNU General Public
// License (GPLv2) for more details.
//
// Neither the names of the California Institute of Technology (Caltech),
// The Massachusetts Institute of Technology (M.I.T), The Laser
// Interferometer Gravitational-Wave Observatory (LIGO), nor the names
// of its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// You should have received a copy of the licensing terms for this
// software included in the file LICENSE located in the top-level
// directory of this package. If you did not, you can view a copy at
// http://dcc.ligo.org/M1500244/LICENSE
//

#include <framecpp_config.h>

#include "framecpp/Common/CheckSumFilter.hh"

namespace FrameCPP
{
    namespace Common
    {
        CheckSumFilter::CheckSumFilter( CheckSum::kind_type Type )
        {
            m_checksum.reset( CheckSum::Create( Type ) );
        }

        void
        CheckSumFilter::filter( const char* Buffer, INT_8U Size )
        {
            if ( m_checksum.get( ) )
            {
                m_checksum->calc( Buffer, CheckSum::size_type( Size ) );
            }
        }

        CheckSum::self_ptr_type
        CheckSumFilter::SaveState( ) const
        {
            if ( m_checksum.get( ) )
            {
                return m_checksum->Clone( );
            }
            return CheckSum::self_ptr_type( );
        }

        void
        CheckSumFilter::RestoreState( CheckSum::self_ptr_type saved )
        {
            // Use move assignment for cleaner ownership transfer
            m_checksum = std::move( saved );
        }
    } // namespace Common
} // namespace FrameCPP
