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//+-------------------------------------------------------------------
//
// Microsoft Windows
// Copyright (C) Microsoft Corporation, 1992 - 1992.
//
// File: stream.hxx
//
// Contents: Stream header for mstream project
//
// Classes: CSStream - single linear stream for MSF
//
// History: 18-Jul-91 Philipla Created.
//
//--------------------------------------------------------------------
#ifndef __STREAM_HXX__
#define __STREAM_HXX__
#include <msf.hxx>
#include <handle.hxx>
#include <tset.hxx>
#include <psstream.hxx>
#include <dfbasis.hxx>
#include <cache.hxx>
#include <dl.hxx>
//+----------------------------------------------------------------------
//
// Class: CDirectStream (ds)
//
// Purpose: Direct stream class
//
// History: 18-Jul-91 PhilipLa Created.
//
// Notes:
//
//-----------------------------------------------------------------------
class CDirectStream: public PSStream, public CMallocBased
{
public:
inline void *operator new(size_t size, IMalloc * const pMalloc);
inline void *operator new(size_t size, CDFBasis * const pdfb);
inline void ReturnToReserve(CDFBasis * const pdfb);
inline static SCODE Reserve(UINT cItems, CDFBasis * const pdfb);
inline static void Unreserve(UINT cItems, CDFBasis * const pdfb);
CDirectStream(DFLUID dl);
~CDirectStream(void);
void InitSystem(CMStream *pms,
SID sid,
ULONG cbSize);
SCODE Init(CStgHandle *pstgh,
CDfName const *pdfn,
BOOL const fCreate);
virtual void AddRef(VOID);
inline void DecRef(VOID);
virtual void Release(VOID);
virtual SCODE BeginCommitFromChild(
ULONG ulSize,
CDeltaList *pDelta,
CTransactedStream *pstChild);
virtual void EndCommitFromChild(DFLAGS df,
CTransactedStream *pstChild);
virtual CDeltaList * GetDeltaList(void);
virtual SCODE ReadAt(
ULONG ulOffset,
VOID HUGEP *pBuffer,
ULONG ulCount,
ULONG STACKBASED *pulRetval);
virtual SCODE WriteAt(
ULONG ulOffset,
VOID const HUGEP *pBuffer,
ULONG ulCount,
ULONG STACKBASED *pulRetval);
virtual SCODE SetSize(ULONG ulNewSize);
virtual void GetSize(ULONG *pulSize);
// PBasicEntry
inline CStmHandle *GetHandle(void);
private:
#ifdef SECURE_STREAMS
void ClearSects(ULONG ulStartOffset, ULONG ulEndOffset);
ULONG _ulHighWater;
#endif
CStmHandle _stmh;
CStreamCache _stmc;
ULONG _ulSize;
ULONG _ulOldSize;
LONG _cReferences;
CBasedDeltaListPtr _pdlHolder;
};
//+--------------------------------------------------------------
//
// Member: CDirectStream::operator new, public
//
// Synopsis: Unreserved object allocator
//
// Arguments: [size] -- byte count to allocate
// [pMalloc] -- allocator
//
// History: 25-May-93 AlexT Created
//
//---------------------------------------------------------------
inline void *CDirectStream::operator new(size_t size, IMalloc * const pMalloc)
{
return(CMallocBased::operator new(size, pMalloc));
}
//+--------------------------------------------------------------
//
// Member: CDirectStream::operator new, public
//
// Synopsis: Reserved object allocator
//
// Arguments: [size] -- byte count to allocate
// [pdfb] -- basis
//
// History: 25-May-93 AlexT Created
//
//---------------------------------------------------------------
inline void *CDirectStream::operator new(size_t size, CDFBasis * const pdfb)
{
olAssert(size == sizeof(CDirectStream));
return pdfb->GetFreeList(CDFB_DIRECTSTREAM)->GetReserved();
}
//+--------------------------------------------------------------
//
// Member: CDirectStream::ReturnToReserve, public
//
// Synopsis: Reserved object return
//
// Arguments: [pdfb] -- basis
//
// History: 25-May-93 AlexT Created
//
//---------------------------------------------------------------
#ifdef CODESEGMENTS
#pragma code_seg(SEG_CDirectStream_ReturnToReserve)
#endif
inline void CDirectStream::ReturnToReserve(CDFBasis * const pdfb)
{
CDirectStream::~CDirectStream();
pdfb->GetFreeList(CDFB_DIRECTSTREAM)->ReturnToReserve(this);
}
#ifdef CODESEGMENTS
#pragma code_seg()
#endif
//+--------------------------------------------------------------
//
// Member: CDirectStream::Reserve, public
//
// Synopsis: Reserve instances
//
// Arguments: [cItems] -- count of items
// [pdfb] -- basis
//
// History: 25-May-93 AlexT Created
//
//---------------------------------------------------------------
inline SCODE CDirectStream::Reserve(UINT cItems, CDFBasis * const pdfb)
{
return pdfb->Reserve(cItems, CDFB_DIRECTSTREAM);
}
//+--------------------------------------------------------------
//
// Member: CDirectStream::Unreserve, public
//
// Synopsis: Unreserve instances
//
// Arguments: [cItems] -- count of items
// [pdfb] -- basis
//
// History: 25-May-93 AlexT Created
//
//---------------------------------------------------------------
inline void CDirectStream::Unreserve(UINT cItems, CDFBasis * const pdfb)
{
pdfb->Unreserve(cItems, CDFB_DIRECTSTREAM);
}
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::GetHandle, public
//
// Synopsis: Returns a pointer to the stream handle
//
// History: 25-Jun-92 DrewB Created
//
//----------------------------------------------------------------------------
inline CStmHandle *CDirectStream::GetHandle(void)
{
return &_stmh;
}
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::DecRef, public
//
// Synopsis: Decrements the ref count
//
// History: 25-Nov-92 DrewB Created
//
//----------------------------------------------------------------------------
inline void CDirectStream::DecRef(void)
{
AtomicDec(&_cReferences);
}
#endif //__SSTREAM_HXX__
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