bytestreambuf.hpp

ncbi源码

/*
 * ===========================================================================
 * PRODUCTION $Log: bytestreambuf.hpp,v $
 * PRODUCTION Revision 1000.1  2004/04/21 14:47:46  gouriano
 * PRODUCTION PRODUCTION: UPGRADED [CATCHUP_003] Dev-tree R1.3
 * PRODUCTION
 * ===========================================================================
 */

#ifndef _BYTESTREAMBUF_HPP_
#define _BYTESTREAMBUF_HPP_

/* $Id: bytestreambuf.hpp,v 1000.1 2004/04/21 14:47:46 gouriano Exp $
* ===========================================================================
*
*                            PUBLIC DOMAIN NOTICE                          
*               National Center for Biotechnology Information
*                                                                          
*  This software/database is a "United States Government Work" under the   
*  terms of the United States Copyright Act.  It was written as part of    
*  the author's official duties as a United States Government employee and 
*  thus cannot be copyrighted.  This software/database is freely available 
*  to the public for use. The National Library of Medicine and the U.S.    
*  Government have not placed any restriction on its use or reproduction.  
*                                                                          
*  Although all reasonable efforts have been taken to ensure the accuracy  
*  and reliability of the software and data, the NLM and the U.S.          
*  Government do not and cannot warrant the performance or results that    
*  may be obtained by using this software or data. The NLM and the U.S.    
*  Government disclaim all warranties, express or implied, including       
*  warranties of performance, merchantability or fitness for any particular
*  purpose.                                                                
*                                                                          
*  Please cite the author in any work or product based on this material.   
*
* ===========================================================================
*
* File Name:  $Id: bytestreambuf.hpp,v 1000.1 2004/04/21 14:47:46 gouriano Exp $
*
* Author:  Michael Kholodov
*   
* File Description:  streambuf implementation for BLOBs
*
*
* $Log: bytestreambuf.hpp,v $
* Revision 1000.1  2004/04/21 14:47:46  gouriano
* PRODUCTION: UPGRADED [CATCHUP_003] Dev-tree R1.3
*
* Revision 1.3  2002/05/14 19:51:48  kholodov
* Fixed: incorrect column no handling for detecting end of column
*
* Revision 1.2  2002/05/13 19:11:53  kholodov
* Modified: added proper handling of EOFs while reading column data using CDB_Result::CurrentItemNo().
*
* Revision 1.1  2002/01/30 14:51:22  kholodov
* User DBAPI implementation, first commit
*
*
*
*/

#include <corelib/ncbistd.hpp>
#include <corelib/ncbistre.hpp>
//#include <iostream>
#include <dbapi/driver/interfaces.hpp>

BEGIN_NCBI_SCOPE

class CByteStreamBuf : public streambuf
{
public:
    CByteStreamBuf(streamsize bufsize);
    virtual ~CByteStreamBuf();

    void SetCmd(CDB_SendDataCmd* cmd);
    void SetRs(CDB_Result* rs);

protected:
    virtual streambuf* setbuf(CT_CHAR_TYPE* p, streamsize n);
    virtual CT_INT_TYPE underflow();
    virtual streamsize showmanyc();

    virtual CT_INT_TYPE overflow(CT_INT_TYPE c);
    virtual int sync();
  

private:

    CT_CHAR_TYPE* getGBuf();
    CT_CHAR_TYPE* getPBuf();

    CT_CHAR_TYPE* m_buf;
    streamsize m_size;
    streamsize m_len;
    class CDB_Result* m_rs;
    class CDB_SendDataCmd* m_cmd;
    int m_column;

};

END_NCBI_SCOPE
//=================================================================
#endif // _BYTESTREAMBUF_HPP_