149 lines
2.3 KiB
C++
149 lines
2.3 KiB
C++
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/*++
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Copyright (c) 1990 Microsoft Corporation
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Module Name:
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hmem.hxx
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Abstract:
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The class HMEM is an implementation of the class MEM which uses the
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memory resources of the heap.
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After the first call to Acquire that succeeds, all successive calls
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will return the same memory that was returned by the first call
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provided that the size requested is within the bounds of the first call.
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The common buffer which was created upon the first successful call to
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Acquire will be available along with its size by calling GetBuf and
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QuerySize.
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Calling Destroy will put the object back in its initial state thus
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invalidating any pointers to its memory and enabling future calls
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to Acquire to succeed regardless of the size specicified.
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--*/
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#if !defined(HMEM_DEFN)
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#define HMEM_DEFN
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#include "mem.hxx"
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DECLARE_CLASS( HMEM );
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class HMEM : public MEM {
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public:
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ULIB_EXPORT
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DECLARE_CONSTRUCTOR( HMEM );
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VIRTUAL
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ULIB_EXPORT
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~HMEM(
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);
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NONVIRTUAL
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ULIB_EXPORT
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BOOLEAN
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Initialize(
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);
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VIRTUAL
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ULIB_EXPORT
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PVOID
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Acquire(
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IN ULONG Size,
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IN ULONG AlignmentMask DEFAULT 0
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);
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NONVIRTUAL
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PVOID
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GetBuf(
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) CONST;
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NONVIRTUAL
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ULONG
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QuerySize(
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) CONST;
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NONVIRTUAL
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ULIB_EXPORT
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BOOLEAN
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Resize(
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IN ULONG NewSize,
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IN ULONG AlignmentMask DEFAULT 0
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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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ULONG _size;
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PVOID _real_buf;
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PVOID _buf;
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};
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INLINE
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PVOID
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HMEM::GetBuf(
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) CONST
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/*++
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Routine Description:
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This routine returns the memory that was previously 'Acquired'.
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Arguments:
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None.
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Return Value:
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A pointer to the beginning of the memory buffer.
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--*/
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{
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return _buf;
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}
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INLINE
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ULONG
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HMEM::QuerySize(
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) CONST
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/*++
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Routine Description:
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This routine returns the size of the memory that was previously
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'Acquired'.
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Arguments:
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None.
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Return Value:
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The size of the memory returned by 'GetBuf'.
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--*/
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{
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return _size;
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}
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#endif // HMEM_DEFN
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