filedatasource.h

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/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
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 *     91191 Gif-sur-Yvette cedex
 *     France
 *
 * 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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 * economic rights,  and the successive licensors  have only  limited
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#ifndef SOMAIO_DATASOURCE_FILEDATASOURCE_H
#define SOMAIO_DATASOURCE_FILEDATASOURCE_H
 
#ifndef _WIN32
  #define CARTO_FILEDS_AS_FD
#endif
//--- soma-io ----------------------------------------------------------------
#include <soma-io/config/soma_config.h>
#ifdef CARTO_FILEDS_AS_FD
  #include <soma-io/datasource/fddatasource.h>                   // base class
#else
  #include <soma-io/datasource/cstreamdatasource.h>              // base class
#endif
//--- system -----------------------------------------------------------------
#include <string>
//----------------------------------------------------------------------------
 
namespace soma
{
 
  class FileDataSource : 
    #ifdef CARTO_FILEDS_AS_FD
      public FDDataSource
    #else
      public CStreamDataSource
    #endif
  {
  public:
    FileDataSource( const std::string & filename, offset_t offset = 0, 
                    int mode = Read );
    virtual ~FileDataSource();
    virtual std::string url() const;
    offset_t initialOffset() const;
 
    virtual DataSource* clone() const;
    virtual bool open( int mode );
    virtual bool allowsMemoryMapping() const;
    virtual offset_t size() const;
    virtual offset_t at() const;
    virtual bool at( offset_t pos );
 
  private:
    std::string _url;
    offset_t    _offset;
  };
 
}
 
#endif