146 lines
2 KiB
C++
146 lines
2 KiB
C++
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 1991 Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
cache.hxx
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
This class models a cache of equal sized blocks.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
|
||
|
|
#if !defined(_CACHE_DEFN_)
|
||
|
|
|
||
|
|
#define _CACHE_DEFN_
|
||
|
|
|
||
|
|
|
||
|
|
#include "bigint.hxx"
|
||
|
|
|
||
|
|
|
||
|
|
DECLARE_CLASS(CACHE);
|
||
|
|
|
||
|
|
|
||
|
|
class CACHE : public OBJECT {
|
||
|
|
|
||
|
|
public:
|
||
|
|
|
||
|
|
DECLARE_CONSTRUCTOR( CACHE );
|
||
|
|
|
||
|
|
VIRTUAL
|
||
|
|
~CACHE(
|
||
|
|
);
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
BOOLEAN
|
||
|
|
Initialize(
|
||
|
|
IN ULONG BlockSize,
|
||
|
|
IN ULONG MaximumNumberOfBlocks
|
||
|
|
);
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
BOOLEAN
|
||
|
|
Read(
|
||
|
|
IN BIG_INT BlockNumber,
|
||
|
|
OUT PVOID Buffer
|
||
|
|
) CONST;
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
VOID
|
||
|
|
AddBlock(
|
||
|
|
IN BIG_INT BlockNumber,
|
||
|
|
IN PCVOID Buffer
|
||
|
|
);
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
VOID
|
||
|
|
Empty(
|
||
|
|
);
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
ULONG
|
||
|
|
QueryMaxNumBlocks(
|
||
|
|
) CONST;
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
ULONG
|
||
|
|
QueryBlockSize(
|
||
|
|
) CONST;
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
VOID
|
||
|
|
Construct(
|
||
|
|
);
|
||
|
|
|
||
|
|
NONVIRTUAL
|
||
|
|
VOID
|
||
|
|
Destroy(
|
||
|
|
);
|
||
|
|
|
||
|
|
PVOID* _buffer;
|
||
|
|
PBIG_INT _block_number;
|
||
|
|
PLONG _inuse;
|
||
|
|
ULONG _num_blocks;
|
||
|
|
ULONG _block_size;
|
||
|
|
ULONG _next_add;
|
||
|
|
LONG _next_add_inuse;
|
||
|
|
LARGE_INTEGER _timeout;
|
||
|
|
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
INLINE
|
||
|
|
ULONG
|
||
|
|
CACHE::QueryMaxNumBlocks(
|
||
|
|
) CONST
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This routine returns the number of cache blocks used by this object.
|
||
|
|
|
||
|
|
Arguments:
|
||
|
|
|
||
|
|
None.
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
The maximum number of cache blocks.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
{
|
||
|
|
return _num_blocks;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
INLINE
|
||
|
|
ULONG
|
||
|
|
CACHE::QueryBlockSize(
|
||
|
|
) CONST
|
||
|
|
/*++
|
||
|
|
|
||
|
|
Routine Description:
|
||
|
|
|
||
|
|
This routine returns the number of bytes per block.
|
||
|
|
|
||
|
|
Arguments:
|
||
|
|
|
||
|
|
None.
|
||
|
|
|
||
|
|
Return Value:
|
||
|
|
|
||
|
|
The number of bytes per block.
|
||
|
|
|
||
|
|
--*/
|
||
|
|
{
|
||
|
|
return _block_size;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
#endif // _CACHE_DEFN_
|