MNFileSourceSH.h

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/* Copyright (C) 2000 KOM/Darmstadt University of Technology
 *
 * You are allowed to use all other parts of the code under the following terms:
 *
 * For non-commercial use, code may be used in unmodified form provided
 * that this copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * This software is provided "as is" and without any express or implied
 * warranties, including, without limitation, the implied warranty of
 * fitness for a particular purpose.
 *
 * The code may be subjected to the GNU General Public License, Version 2,
 * and re-distributed under the terms of this license.
 * As a special exception, permission is granted to link this code
 * with the Qt library and distribute executables, as long as you
 * follow the requirements of the GNU GPL in regard to all of the
 * software in the executable aside from Qt.
 *
 * Commercial use other than under the terms of the GNU General Public
 * License is allowed only after express negotiation of conditions
 * with the authors.
 */
#ifndef MN_FILE_SOURCE_STREAM_HANDLER_H
#define MN_FILE_SOURCE_STREAM_HANDLER_H

#include <sys/types.h>
#include <stdio.h>

#include "SH.h"
#include "SHEndpoint.h"
#include "SHEndpointSpec.h"
#include "var_type.h"

class MNRope;

namespace SH
{

class FileSourceSH;

/**********************************************************************/
/* FileSourceEndpoint                                                 */
/**********************************************************************/

class FileSourceEndpoint
    : public SourceEndpoint
{
public:
    FileSourceEndpoint( FileSourceSH* mySH );
    virtual ~FileSourceEndpoint( );

    virtual SH_RC pull( DataPtr&   item,
                        SourceUnit su,
                        size_t     amount );

    FileSourceSH* fsh();
};

/**********************************************************************/
/* FileSourceSH                                                       */
/**********************************************************************/

class FileSourceSH
    : public Base
{
public:
    FileSourceSH( SHGraphManager* mgr,
                  u_int32_t       runtimeId,
                  MNSelector&     sel );

    virtual ~FileSourceSH();

private:

    FileSourceSH( const FileSourceSH& );

    FileSourceSH& operator=( const FileSourceSH& );

public:
    virtual SH_RC initSH();
    virtual SH_RC uninitSH();

    virtual SH_RC startStreaming();

    SH_RC changePos ( u_int64 pos );

    long  getPos( );
    SH_RC getPos ( long &pos );

    SH_RC pull_from_file( DataPtr&   item,
                          SourceUnit su,
                          size_t     amount );

    /******************************************************************/
    /* additional attributes for the set() functions                  */
    /******************************************************************/
public:
    SA_FILE_NAME             _filename;
private:
    int                      _file_handle;
    FILE*                    _file_stream;

    SA_FILESRC_DEFAULT_UNIT  _default_unit;
public:
    SA_FILESRC_START_POS     _start_pos;
    SA_FILESRC_STOP_POS      _stop_pos;

private:
    long _actual_position;

    // Attributes haved been moved to SH.h

    /******************************************************************/
    /* functions required for SH::Spec                                */
    /******************************************************************/
protected:
    friend class FileSourceEndpoint;

    SourceEndpoint*        _out_ep_a[1];
    FileSourceEndpoint     _outEP;

public:
    virtual SinkEndpoint**   getSinkSpecs();
    virtual SourceEndpoint** getSourceSpecs();

    /******************************************************************/
    /* functions required for SHStatus                                */
    /******************************************************************/
    virtual bool isConnected() const;
};


}; // namespace SH

#endif /* MN_FILE_SOURCE_STREAM_HANDLER_H */

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