Source code of Windows XP (NT5)
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///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Microsoft WMIOLE DB Provider
// (C) Copyright 1999 Microsoft Corporation. All Rights Reserved.
//
// Class Definitions for CExtBuffer Class
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
#ifndef _EXTBUFF_H_
#define _EXTBUFF_H_
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Forward Declaration
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class FAR CExtBuffer;typedef CExtBuffer FAR *LPEXTBUFFER;
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//
// Allocates and manages fixed sized block memory routines
//
// ext or pext
//
///////////////////////////////////////////////////////////////////////////////////////////////////////////////////
class FAR CExtBuffer{ private: ULONG m_cbItem; // Current count of items
ULONG m_cItem; // Item size, in bytes
ULONG m_cbReserved; // Reserved byte count
ULONG m_cbAlloc; // Allocated byte count
ULONG m_dbAlloc; // increment value
BYTE *m_rgItem; // Ptr to beginning of buffer
private: CExtBuffer( const CExtBuffer & p); // Not implemented; private so dcl prevents generation.
CExtBuffer& operator=(const CExtBuffer & p);
public: CExtBuffer ( void ); ~CExtBuffer ( void ); void * operator[] (ULONG nIndex); // Calculated data pointer from index value
STDMETHODIMP FInit (ULONG cItemMax, ULONG cbItem, ULONG cbPage); // Initialize the fixed size buffer
STDMETHODIMP InsertIntoExtBuffer (VOID* pvItem, ULONG &hItem); // Add new items to the buffer
STDMETHODIMP GetItemOfExtBuffer (HACCESSOR hItem, VOID* pvItem); // Retrieve items from buffer
STDMETHODIMP GetFirstLastItemH (HACCESSOR &hItemFirst, HACCESSOR &hItemLast);// Get usage extent indexes
};
#endif
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