//+-------------------------------------------------------------------------
//
//  Microsoft Windows
//  Copyright (C) Microsoft Corporation, 1992 - 1996.
//
//  File:	ilbmem.hxx
//
//  Contents:	ILockBytes memory implementation
//
//  Classes:	CMapBytes
//
//--------------------------------------------------------------------------

#ifndef __ILB_HXX__

#include "../../h/ref.hxx"

#define ULISetLow(li, v) ((li).u.LowPart = (v))
#define ULISetHigh(li, v) ((li).u.HighPart = (v))
#define ULIGetLow(li)  ((li).u.LowPart)
#define ULIGetHigh(li) ((li).u.HighPart)

#ifdef _WIN32
#define AtomicInc(lp) InterlockedIncrement(lp)
#define AtomicDec(lp) InterlockedDecrement(lp)
#else
inline void AtomicInc(long *lp) { (*lp)++; }
inline void AtomicDec(long *lp) { (*lp)--; }
#endif

#if DBG == 1

DECLARE_DEBUG(ol);

#define olDebugOut(parms)	olInlineDebugOut parms
#include <assert.h>
#define olAssert(exp)		assert(exp)

#else  // DBG != 1

#define olDebugOut(parms)
#define olAssert(exp)

#endif // DBG == 1

class CMapBytes : public ILockBytes
{
public:
    CMapBytes(void);

    STDMETHOD(QueryInterface) (REFIID riid, LPVOID FAR* ppvObj);
    STDMETHOD_(ULONG,AddRef) (void);
    STDMETHOD_(ULONG,Release) (void);

    STDMETHOD(ReadAt) (ULARGE_INTEGER ulOffset,
             VOID HUGEP *pv,
             ULONG cb,
             ULONG FAR *pcbRead);
    STDMETHOD(WriteAt) (ULARGE_INTEGER ulOffset,
              VOID const HUGEP *pv,
              ULONG cb,
              ULONG FAR *pcbWritten);
    STDMETHOD(Flush) (void);
    STDMETHOD(GetSize) (ULARGE_INTEGER FAR *pcb);
    STDMETHOD(SetSize) (ULARGE_INTEGER cb);
    STDMETHOD(LockRegion) (ULARGE_INTEGER libOffset,
                 ULARGE_INTEGER cb,
                 DWORD dwLockType);
    STDMETHOD(UnlockRegion) (ULARGE_INTEGER libOffset,
                   ULARGE_INTEGER cb,
                 DWORD dwLockType);

    STDMETHOD(Stat) (STATSTG FAR *pstatstg, DWORD grfStatFlag);

private:
    LONG _ulRef;	//  reference count
    ULONG _ulSize;	//  memory map size
    void FAR *_pv;		//  memory map
};

#endif // #ifndef __ILB_HXX__