bufferdatasource.h

Go to the documentation of this file.

/* This software and supporting documentation are distributed by
 *     Institut Federatif de Recherche 49
 *     CEA/NeuroSpin, Batiment 145,
 *     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".
 *
 * As a counterpart to the access to the source code and  rights to copy,
 * modify and redistribute granted by the license, users are provided only
 * with a limited warranty  and the software's author,  the holder of the
 * economic rights,  and the successive licensors  have only  limited
 * liability.
 *
 * In this respect, the user's attention is drawn to the risks associated
 * with loading,  using,  modifying and/or developing or reproducing the
 * software by the user in light of its specific status of free software,
 * that may mean  that it is complicated to manipulate,  and  that  also
 * therefore means  that it is reserved for developers  and  experienced
 * professionals having in-depth computer knowledge. Users are therefore
 * encouraged to load and test the software's suitability as regards their
 * requirements in conditions enabling the security of their systems and/or
 * data to be ensured and,  more generally, to use and operate it in the
 * same conditions as regards security.
 *
 * The fact that you are presently reading this means that you have had
 * knowledge of the CeCILL-B license and that you accept its terms.
 */
 
#ifndef SOMAIO_DATASOURCE_BUFFERDATASOURCE_H
#define SOMAIO_DATASOURCE_BUFFERDATASOURCE_H
//--- soma-io ----------------------------------------------------------------
#include <soma-io/config/soma_config.h>
#include <soma-io/datasource/datasource.h>                       // base class
//----------------------------------------------------------------------------
 
namespace soma
{
 
  class BufferDataSource : public DataSource
  {
  public:
    BufferDataSource( char* ptr = 0, unsigned long size = 0, int mode = Read );
    virtual ~BufferDataSource();
 
    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;
 
    const char *buffer() const;
    char *buffer();
    void setBuffer( char* ptr, unsigned long size, int mode );
 
  private:
    char                *_buffer;
    unsigned long       _size;
    unsigned long       _pos;
  };
 
}
 
#endif