EXTBUFF.H

//-------------------------------------------------------------------- 
// Microsoft OLE DB Sample Provider 
// (C) Copyright 1994 - 1996 Microsoft Corporation.  All Rights Reserved. 
// 
// @doc 
// 
// @module EXTBUFF.H | Class Definitions for CExtBuffer Class 
// 
// 
#ifndef _EXTBUFF_H_ 
#define _EXTBUFF_H_ 
 
// Forward Declaration 
class FAR CExtBuffer; 
typedef CExtBuffer FAR *LPEXTBUFFER; 
 
 
//-------------------------------------------------------------------- 
// @class Allocates and manages fixed sized block memory routines 
//  
// @hungarian ext or pext 
// 
class FAR CExtBuffer 
{ 
private: //@access private 
//@cmember Current count of items 
ULONG    m_cbItem; 
//@cmember Item size, in bytes 
ULONG    m_cItem; 
//@cmember Reserved byte count 
ULONG    m_cbReserved; 
//@cmember Allocated byte count 
ULONG    m_cbAlloc; 
//@cmember increment value 
ULONG    m_dbAlloc; 
//@cmember Ptr to beginning of buffer 
BYTE     *m_rgItem; 
 
 
private: 
// Not implemented; private so dcl prevents generation. 
CExtBuffer( const CExtBuffer & p); 
CExtBuffer& operator=(const CExtBuffer & p); 
 
public://@access public 
//@cmember Construcutor 
CExtBuffer ( void ); 
//@cmember Destructor 
~CExtBuffer ( void ); 
//@cmember Calculated data pointer from index value 
void * operator[] (ULONG nIndex); 
//@cmember Initialize the fixed size buffer 
STDMETHODIMP FInit (ULONG cItemMax, ULONG cbItem, ULONG cbPage); 
//@cmember Add new items to the buffer 
STDMETHODIMP InsertIntoExtBuffer (VOID* pvItem, ULONG &hItem); 
//cmember Retrieve items from buffer 
STDMETHODIMP    GetItemOfExtBuffer (ULONG hItem,VOID* pvItem); 
//@cmember Get usage extent indexes 
STDMETHODIMP    GetFirstLastItemH (ULONG &hItemFirst, ULONG &hItemLast); 
}; 
 
#endif