439 lines
10 KiB
C++
439 lines
10 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 - 1996.
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//
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// File: fat.hxx
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//
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// Contents: Header file for fat classes
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//
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// Classes: CFatSect - sector sized array of sector info
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// CFatVector - resizable array of CFatSect
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// CFat - Grouping of FatSect
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//
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//--------------------------------------------------------------------
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#ifndef __FAT_HXX__
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#define __FAT_HXX__
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#include "vect.hxx"
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#define DEB_FAT (DEB_ITRACE|0x00010000)
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//+----------------------------------------------------------------------
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//
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// Class: CFatSect (fs)
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//
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// Purpose: Holds one sector worth of FAT data
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//
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// Interface: getsize - Returns the size of the FAT (in sectors)
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// contents - Returns contents of any given FAT entry
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//
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// Notes:
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//
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//-----------------------------------------------------------------------
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class CFatSect
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{
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public:
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SCODE Init(FSOFFSET uEntries);
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SCODE InitCopy(USHORT uSize, CFatSect& fsOld);
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inline SECT GetSect(const FSOFFSET sect) const;
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inline void SetSect(const FSOFFSET sect,const SECT sectNew);
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inline SECT GetNextFat(USHORT uSize) const;
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inline void SetNextFat(USHORT uSize, const SECT sect);
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inline void ByteSwap(USHORT cbSector);
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private:
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#ifdef _MSC_VER
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#pragma warning(disable: 4200)
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SECT _asectEntry[];
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#pragma warning(default: 4200)
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#endif
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#ifdef __GNUC__
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SECT _asectEntry[0];
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#endif
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};
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inline SECT CFatSect::GetSect(const FSOFFSET sect) const
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{
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return _asectEntry[sect];
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}
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inline void CFatSect::SetSect(const FSOFFSET sect,
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const SECT sectNew)
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{
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_asectEntry[sect] = sectNew;
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}
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inline SECT CFatSect::GetNextFat(USHORT uSize) const
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{
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return _asectEntry[uSize];
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}
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inline void CFatSect::SetNextFat(USHORT uSize, const SECT sect)
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{
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_asectEntry[uSize] = sect;
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}
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inline void CFatSect::ByteSwap(FSOFFSET cbSector)
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{
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// swap all sectors in the sector
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for (FSOFFSET i=0; i < cbSector; i++)
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::ByteSwap(&(_asectEntry[i]));
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}
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//+-------------------------------------------------------------------------
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//
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// Class: CFatVector (fv)
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//
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// Purpose: *finish this*
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//
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// Interface:
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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class CFatVector: public CPagedVector
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{
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public:
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inline CFatVector( const SID sid,
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FSOFFSET csectBlock,
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FSOFFSET csectTable);
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SCODE InitPage(FSINDEX iPage);
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inline FSOFFSET GetSectBlock() const;
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inline FSOFFSET GetSectTable() const;
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inline SCODE GetTable( const FSINDEX iTable,
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const DWORD dwFlags,
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CFatSect **pfs);
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private:
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FSOFFSET const _csectTable;
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FSOFFSET const _csectBlock;
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inline void operator = (const CFatVector &that);
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#ifdef _MSC_VER
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#pragma warning(disable:4512)
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// since there is a const member, there should be no assignment operator
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#endif // _MSC_VER
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};
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#ifdef _MSC_VER
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#pragma warning(default:4512)
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#endif // _MSC_VER
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inline CFatVector::CFatVector(
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const SID sid,
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FSOFFSET csectBlock,
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FSOFFSET csectTable)
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: CPagedVector(sid),
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_csectTable(csectTable),
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_csectBlock(csectBlock)
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{
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CFatVector::GetSectTable, public
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//
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// Synopsis: Returns count of sector entries per table
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//
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// Returns: count of sector entries per table
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//
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//--------------------------------------------------------------------------
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inline FSOFFSET CFatVector::GetSectTable() const
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{
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return _csectTable;
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CFatVector::GetSectTable, public
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//
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// Synopsis: Returns count of sector entries per block
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//
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// Returns: count of sector entries per block
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//
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//--------------------------------------------------------------------------
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inline FSOFFSET CFatVector::GetSectBlock() const
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{
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return _csectBlock;
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}
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//+-------------------------------------------------------------------------
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//
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// Method: CFatVector::GetTable, public
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//
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// Synopsis: Return a pointer to a FatSect for the given index
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// into the vector.
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//
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// Arguments: [iTable] -- index into vector
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//
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// Returns: Pointer to CFatSect indicated by index
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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inline SCODE CFatVector::GetTable(
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const FSINDEX iTable,
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const DWORD dwFlags,
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CFatSect **ppfs)
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{
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SCODE sc;
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sc = CPagedVector::GetTable(iTable, dwFlags, (void **)ppfs);
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if (sc == STG_S_NEWPAGE)
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{
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(*ppfs)->Init(_csectBlock);
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}
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return sc;
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}
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//CSEG determines the maximum number of segments that will be
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//returned by a single Contig call.
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#define CSEG 32
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//+-------------------------------------------------------------------------
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//
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// Class: SSegment (seg)
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//
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// Purpose: Used for contiguity tables for multi-sector reads and
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// writes.
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//
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// Interface: None.
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//
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// Notes:
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//
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//--------------------------------------------------------------------------
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struct SSegment {
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public:
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SECT sectStart;
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ULONG cSect;
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};
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class CMStream;
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//+----------------------------------------------------------------------
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//
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// Class: CFat (fat)
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//
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// Purpose: Main interface to allocation routines
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//
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// Interface: Allocate - allocates new chain in the FAT
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// Extend - Extends an existing FAT chain
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// GetNext - Returns next sector in a chain
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// GetSect - Returns nth sector in a chain
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// GetESect - Returns nth sector in a chain, extending
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// if necessary
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// GetLength - Returns the # of sectors in a chain
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// setup - Initializes for an existing stream
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// setupnew - Initializes for a new stream
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//
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// checksanity - Debugging routine
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//
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// Notes:
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//
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//-----------------------------------------------------------------------
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class CFat
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{
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public:
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CFat(SID sid, USHORT cbSector, USHORT uSectorShift);
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~CFat();
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VOID Empty(VOID);
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inline SCODE Allocate(ULONG ulSize, SECT *psectFirst);
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SCODE GetNext(const SECT sect, SECT * psRet);
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SCODE GetSect(
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SECT sectStart,
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ULONG ulOffset,
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SECT *psectReturn);
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SCODE GetESect(
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SECT sectStart,
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ULONG ulOffset,
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SECT *psectReturn);
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SCODE SetNext(SECT sectFirst, SECT sectNext);
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SCODE GetFree(ULONG ulCount, SECT *sect);
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SCODE GetLength(SECT sect, ULONG * pulRet);
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SCODE SetChainLength(SECT,ULONG);
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SCODE Init(
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CMStream *pmsParent,
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FSINDEX cFatSect,
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BOOL fConvert);
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SCODE InitNew(CMStream *pmsParent);
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SCODE InitConvert(
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CMStream *pmsParent,
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ULONG cbSize);
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SCODE FindLast(SECT *psectRet);
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SCODE FindMaxSect(SECT *psectRet);
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inline SCODE GetMaxSect(SECT *psectRet);
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SCODE Contig(
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SSegment STACKBASED *aseg,
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SECT sect,
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ULONG ulLength);
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inline SCODE Flush(VOID);
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inline void SetParent(CMStream *pms);
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private:
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CFatVector _fv;
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CMStream * _pmsParent;
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const SID _sid;
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const USHORT _uFatShift;
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const USHORT _uFatMask;
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FSINDEX _cfsTable;
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ULONG _ulFreeSects;
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SECT _sectFirstFree;
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SECT _sectMax;
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SCODE CountFree(ULONG * ulRet);
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SCODE Resize(ULONG);
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SCODE Extend(SECT,ULONG);
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inline VOID SectToPair(
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SECT sect,
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FSINDEX *pipfs,
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FSOFFSET *pisect) const;
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inline SECT PairToSect(FSINDEX ipfs, FSOFFSET isect) const;
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friend class CDIFat;
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#ifdef _MSC_VER
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#pragma warning(disable:4512)
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// since there is a const member, there should be no assignment operator
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#endif // _MSC_VER
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};
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#ifdef _MSC_VER
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#pragma warning(default:4512)
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#endif // _MSC_VER
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inline VOID CFat::SectToPair(SECT sect,FSINDEX *pipfs,FSOFFSET *pisect) const
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{
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*pipfs = (FSINDEX)(sect >> _uFatShift);
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*pisect = (FSOFFSET)(sect & _uFatMask);
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}
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inline SECT CFat::PairToSect(FSINDEX ipfs, FSOFFSET isect) const
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{
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return (ipfs << _uFatShift) + isect;
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}
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inline SCODE CFat::GetMaxSect(SECT *psectRet)
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{
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SCODE sc;
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msfChk(FindMaxSect(&_sectMax));
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*psectRet = _sectMax;
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Err:
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return sc;
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}
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inline void CFat::SetParent(CMStream *pms)
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{
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_pmsParent = pms;
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_fv.SetParent(pms);
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFat::Flush, public
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//
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// Synposis: Write all modified FatSects out to stream
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//
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// Effects: Resets all dirty bit fields on FatSects
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//
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// Arguments: Void
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//
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// Returns: S_OK if call completed OK.
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// Error code of parent write otherwise.
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//
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// Algorithm: Linearly scan through FatSects, writing any sector
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// that has the dirty bit set. Reset all dirty bits.
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//
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// Notes:
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//
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//---------------------------------------------------------------------------
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inline SCODE CFat::Flush(VOID)
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{
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return _fv.Flush();
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}
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//+-------------------------------------------------------------------------
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//
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// Member: CFat::Allocate, public
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//
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// Synposis: Allocates a chain within a FAT
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//
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// Effects: Modifies a single sector within the fat. Causes a
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// one sector stream write.
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//
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// Arguments: [ulSize] -- Number of sectors to allocate in chain
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//
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// Returns: Sector ID of first sector in chain
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//
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// Algorithm: Use repetitive calls to GetFree to construct a new chain
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//
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// Notes:
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//
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//---------------------------------------------------------------------------
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inline SCODE CFat::Allocate(ULONG ulSize, SECT * psectFirst)
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{
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return GetFree(ulSize, psectFirst);
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}
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#endif //__FAT_HXX__
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