167 lines
2.7 KiB
C++
167 lines
2.7 KiB
C++
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/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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dcache.hxx
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Abstract:
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This class models a general cache for reading and writing.
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The actual implementation of this base class is to not have
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any cache at all.
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Author:
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Norbert Kusters (norbertk) 23-Apr-92
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--*/
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#if !defined(_DRIVE_CACHE_DEFN_)
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#define _DRIVE_CACHE_DEFN_
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#include "bigint.hxx"
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#include "drive.hxx"
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DECLARE_CLASS(DRIVE_CACHE);
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class DRIVE_CACHE : public OBJECT {
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public:
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DECLARE_CONSTRUCTOR( DRIVE_CACHE );
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VIRTUAL
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~DRIVE_CACHE(
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);
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NONVIRTUAL
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BOOLEAN
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Initialize(
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IN OUT PIO_DP_DRIVE Drive
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);
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VIRTUAL
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BOOLEAN
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Read(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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OUT PVOID Buffer
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);
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VIRTUAL
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BOOLEAN
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Write(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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IN PVOID Buffer
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);
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VIRTUAL
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BOOLEAN
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Flush(
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);
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protected:
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NONVIRTUAL
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BOOLEAN
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HardRead(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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OUT PVOID Buffer
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);
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NONVIRTUAL
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BOOLEAN
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HardWrite(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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IN PVOID Buffer
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);
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private:
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NONVIRTUAL
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VOID
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Construct(
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);
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NONVIRTUAL
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VOID
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Destroy(
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);
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PIO_DP_DRIVE _drive;
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};
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INLINE
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BOOLEAN
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DRIVE_CACHE::HardRead(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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OUT PVOID Buffer
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)
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/*++
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Routine Description:
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This routine reads the requested sectors directly from the disk.
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Arguments:
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StartingSector - Supplies the first sector to be read.
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NumberOfSectors - Supplies the number of sectors to be read.
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Buffer - Supplies the buffer to read the run of sectors to.
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Return Value:
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FALSE - Failure.
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TRUE - Success.
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--*/
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{
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return DRIVE_CACHE::Read(StartingSector, NumberOfSectors, Buffer);
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}
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INLINE
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BOOLEAN
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DRIVE_CACHE::HardWrite(
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IN BIG_INT StartingSector,
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IN SECTORCOUNT NumberOfSectors,
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IN PVOID Buffer
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)
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/*++
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Routine Description:
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This routine writes the requested sectors directly to the disk.
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Arguments:
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StartingSector - Supplies the first sector to be written.
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NumberOfSectors - Supplies the number of sectors to be written.
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Buffer - Supplies the buffer to write the run of sectors from.
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Return Value:
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FALSE - Failure.
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TRUE - Success.
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--*/
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{
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return DRIVE_CACHE::Write(StartingSector, NumberOfSectors, Buffer);
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}
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#endif // _DRIVE_CACHE_DEFN_
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