fddatasource.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
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 * 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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#ifndef SOMAIO_DATASOURCE_FDDATASOURCE_H
#define SOMAIO_DATASOURCE_FDDATASOURCE_H
//--- soma-io ----------------------------------------------------------------
#include <soma-io/config/soma_config.h>
#include <soma-io/datasource/datasource.h>                       // base class
//----------------------------------------------------------------------------
 
namespace soma
{
 
  class FDDataSource : public DataSource
  {
  public:
    FDDataSource( int fd = -1, int mode = Read );
    virtual ~FDDataSource();
 
    virtual DataSource* clone() const;
    virtual int iterateMode() const;
    virtual bool isOpen() const;
    virtual bool open ( int mode );
    virtual void close();
    virtual offset_t size() const;
    virtual offset_t at() const;
    virtual bool at( offset_t pos );
    virtual long readBlock( char* data, unsigned long maxlen );
    virtual long writeBlock( const char* data, unsigned long len );
    virtual int getch();
    virtual int putch( int ch );
    virtual bool ungetch( int ch );
    virtual bool allowsMemoryMapping() const;
 
    int descriptor() const;     // should it be non-const ?
    void setDescriptor( int fd );
    bool isFile() const;
 
  protected:
    int _fd;
  };
 
}
 
#endif