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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,#ifdef LARGE_STREAMS
ULONGLONG cbSize);#else
ULONG cbSize);#endif
SCODE Init(CStgHandle *pstgh, CDfName const *pdfn, BOOL const fCreate); inline void DecRef(VOID); SCODE BeginCommitFromChild(#ifdef LARGE_STREAMS
ULONGLONG ulSize,#else
ULONG ulSize,#endif
CDeltaList *pDelta, CTransactedStream *pstChild); void EndCommitFromChild(DFLAGS df, CTransactedStream *pstChild); CDeltaList * GetDeltaList(void); SCODE ReadAt(#ifdef LARGE_STREAMS
ULONGLONG ulOffset,#else
ULONG ulOffset,#endif
VOID *pBuffer, ULONG ulCount, ULONG STACKBASED *pulRetval); SCODE WriteAt(#ifdef LARGE_STREAMS
ULONGLONG ulOffset,#else
ULONG ulOffset,#endif
VOID const *pBuffer, ULONG ulCount, ULONG STACKBASED *pulRetval); #ifdef LARGE_STREAMS
SCODE SetSize(ULONGLONG ulNewSize); void GetSize(ULONGLONG *pulSize);#else
SCODE SetSize(ULONG ulNewSize);
void GetSize(ULONG *pulSize);#endif
// PBasicEntry
inline CStmHandle *GetHandle(void); inline void EmptyCache (void);
private:#ifdef SECURE_STREAMS
#ifdef LARGE_STREAMS
void ClearSects(ULONGLONG ulStartOffset, ULONGLONG ulEndOffset);
ULONGLONG _ulHighWater;#else
void ClearSects(ULONG ulStartOffset, ULONG ulEndOffset);
ULONG _ulHighWater;#endif
#endif
CStmHandle _stmh; CStreamCache _stmc;#ifdef LARGE_STREAMS
ULONGLONG _ulSize; ULONGLONG _ulOldSize;#else
ULONG _ulSize; ULONG _ulOldSize;#endif
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
//
//---------------------------------------------------------------
inline void CDirectStream::ReturnToReserve(CDFBasis * const pdfb){ CDirectStream::~CDirectStream(); pdfb->GetFreeList(CDFB_DIRECTSTREAM)->ReturnToReserve(this);}
//+--------------------------------------------------------------
//
// 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);}
//+---------------------------------------------------------------------------
//
// Member: CDirectStream::EmptyCache, public
//
// Synopsis: Empties the stream cache
//
// History: 27-Jul-1999 HenryLee Created
//
//----------------------------------------------------------------------------
inline void CDirectStream::EmptyCache (void){ _stmc.Empty();}
#endif //__SSTREAM_HXX__
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