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