111 lines
2.4 KiB
C++
111 lines
2.4 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: cache.hxx
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//
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// Contents: Stream cache code
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//
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// Classes: CStreamCache
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//
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// Functions:
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//
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// History: 26-May-93 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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#ifndef __CACHE_HXX__
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#define __CACHE_HXX__
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class CDirectStream;
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class CDirectory;
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class CFat;
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#define CACHESIZE 9
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struct SCacheEntry
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{
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ULONG ulOffset;
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SECT sect;
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ULONG ulRunLength;
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inline SCacheEntry();
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};
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inline SCacheEntry::SCacheEntry()
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{
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ulOffset = MAX_ULONG;
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sect = ENDOFCHAIN;
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ulRunLength = 0;
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}
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SAFE_DFBASED_PTR(CBasedDirectStreamPtr, CDirectStream);
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//+---------------------------------------------------------------------------
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//
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// Class: CStreamCache (stmc)
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//
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// Purpose: Cache for stream optimization
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//
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// Interface: See below.
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//
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// History: 14-Dec-92 PhilipLa Created
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//
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//----------------------------------------------------------------------------
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class CStreamCache
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{
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public:
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CStreamCache();
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~CStreamCache();
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void Init(CMStream *pmsParent, SID sid, CDirectStream *pds);
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void Empty(void);
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SCODE GetSect(ULONG ulOffset, SECT *psect);
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SCODE GetESect(ULONG ulOffset, SECT *psect);
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SCODE EmptyRegion(ULONG oStart, ULONG oEnd);
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SCODE Allocate(CFat *pfat, ULONG cSect, SECT *psectStart);
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SCODE Contig(
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ULONG ulOffset,
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BOOL fWrite,
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SSegment STACKBASED *aseg,
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ULONG ulLength,
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ULONG *pcSeg);
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private:
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inline CDirectory *GetDir(void);
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inline CFat * GetFat(void);
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inline CFat * GetMiniFat(void);
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#ifdef LARGE_STREAMS
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inline ULONGLONG GetSize(void);
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#else
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inline ULONG GetSize(void);
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#endif
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inline SID GetSid(void);
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inline CFat * SelectFat(void);
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SCODE GetStart(SECT *psectStart);
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inline BOOL CheckSegment(ULONG ulOffset,
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SCacheEntry sce,
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ULONG *pulCount,
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SECT *psectCache,
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ULONG *pulCacheOffset);
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void CacheSegment(SSegment *pseg);
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SCacheEntry _ase[CACHESIZE];
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CBasedDirectStreamPtr _pds;
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CBasedMStreamPtr _pmsParent;
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SID _sid;
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USHORT _uHighCacheIndex;
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USHORT _uNextCacheIndex;
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USHORT _uCacheState;
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};
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#endif // #ifndef __CACHE_HXX__
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