bckR.h

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/* This software and supporting documentation are distributed by
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 *
 * This software is governed by the CeCILL-B license under
 * French law and abiding by the rules of distribution of free software.
 * You can  use, modify and/or redistribute the software under the
 * terms of the CeCILL-B license as circulated by CEA, CNRS
 * and INRIA at the following URL "http://www.cecill.info".
 *
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 * modify and redistribute granted by the license, users are provided only
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 * economic rights,  and the successive licensors  have only  limited
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 */

/*
 *  Bucket reader class
 */
#ifndef AIMS_IO_BCKR_H
#define AIMS_IO_BCKR_H

#include <aims/config/aimsdata_config.h>
#include <aims/io/bckItemR.h>
#include <aims/bucket/bucket.h>
#include <aims/io/bckheader.h>
#include <cartobase/exception/ioexcept.h>
#include <soma-io/utilities/asciidatasourcetraits.h>


namespace aims
{

  template<class T> class AIMSDATA_API BckReader
  {
  public:
    BckReader( const std::string& name ) : _name(name), _itemr( 0 ) {}
    ~BckReader() { delete _itemr; }

    void read( AimsBucket<T> & thing, int frame = -1 );
    void setItemReader( ItemReader<T>* ir )
      { delete _itemr; _itemr = ir; }

  private:
    std::string                         _name;
    ItemReader<AimsBucketItem<T> >      *_itemr;
  };


  template<class T> inline 
  void BckReader<T>::read( AimsBucket<T> & thing, int frame )
  {
    if ( frame >= 0 )
      std::cerr 
        << "Warning : .bck single frame reading not implemented yet -\n" 
        << "reading whole bucket\n";

    BckHeader   hdr( _name );
    uint32_t    buf;
    hdr.read( &buf );
    std::ifstream::off_type offset = buf; // ## does not support large files!

    std::string         fname = hdr.filename();
    bool ascii = ( hdr.openMode() == "ascii" );
    std::ifstream       is( fname.c_str(), std::ios::in | std::ios::binary );
    if ( !is )
      carto::io_error::launchErrnoExcept( fname );
    is.unsetf( std::ios::skipws );
    is.seekg( offset );
    if ( !is )
      carto::io_error::launchErrnoExcept( fname );

    if ( !ascii )
      is.unsetf( std::ios::skipws );
    if ( !_itemr )
      _itemr = new DefaultItemReader<AimsBucketItem<T> >;
    std::unique_ptr< ItemReader<AimsBucketItem<T> > > ir( _itemr->reader( hdr.openMode(), hdr.byteOrder() != AIMS_MAGIC_NUMBER ) );
    DefaultItemReader<uint32_t> sr1;
    std::unique_ptr< ItemReader<uint32_t> > sr( sr1.reader( hdr.openMode(), hdr.byteOrder() != AIMS_MAGIC_NUMBER ) );

    thing.clear();
    thing.setHeader( hdr );

    int size = hdr.dimT();
    uint32_t time=0, nitem=0;
    std::string tmp;

    for ( int t=0; t<size; ++t )
      {
        if ( ascii )
          {
            carto::StreamUtil::skip( is );
            is >> tmp;
            if ( tmp != "-time" )
              throw carto::invalid_format_error( fname );
          }
        sr->read( is, time );
        if ( ascii )
          {
            carto::StreamUtil::skip( is );
            is >> tmp;
            if ( tmp != "-dim" )
              throw carto::invalid_format_error( fname );
          }
        sr->read( is, nitem );
        if ( !is )
          carto::io_error::launchErrnoExcept( fname );
        std::list<AimsBucketItem<T> >   & items = thing[ time ];
        AimsBucketItem<T>               item;

        for ( uint32_t n=0; n<nitem; ++n )
          {
            ir->read( is, item );
            items.push_back(item);
          }
        if ( !is )
          carto::io_error::launchErrnoExcept( fname );
      }
  }

}


template<class T> inline 
aims::BckReader<T> & operator >> ( aims::BckReader<T> & reader, 
                                   AimsBucket<T> & thing )
{
  reader.read( thing );
  return reader;
}


#endif