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80 lines
1.9 KiB
80 lines
1.9 KiB
//+---------------------------------------------------------------------------
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//
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// Copyright (c) 1997, Microsoft Corporation.
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//
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// File: mmistrm.hxx
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//
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// Contents: Memory Mapped IStream
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//
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// Classes: CMmIStream
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//
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// History: 11-Feb-97 KyleP Created
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//
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//----------------------------------------------------------------------------
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#pragma once
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#include <pmmstrm.hxx>
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//+---------------------------------------------------------------------------
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//
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// Class: CMmIStream
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//
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// Purpose: Memory Mapped Stream, based on IStream
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//
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// History: 11-Feb-97 KyleP Created
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//
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//----------------------------------------------------------------------------
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class CMmIStream: INHERIT_VIRTUAL_UNWIND, public PMmStream
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{
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friend class CMmStreamBuf;
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INLINE_UNWIND(CMmIStream)
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public:
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CMmIStream();
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BOOL Ok() { return _pStream != 0; }
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virtual ~CMmIStream();
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void Open( IStream * pStream );
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void Close();
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void SetSize( PStorage& storage, ULONG newSizeLow, ULONG newSizeHigh ) {}
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BOOL isEmpty() { return _statstg.cbSize.HighPart == 0 && _statstg.cbSize.LowPart == 0; }
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ULONG SizeLow() { return _statstg.cbSize.LowPart; }
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ULONG SizeHigh() { return _statstg.cbSize.HighPart; }
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LONGLONG Size() { return _statstg.cbSize.QuadPart; }
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BOOL isWritable() { return FALSE; }
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void MapAll ( CMmStreamBuf& sbuf );
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void Map ( CMmStreamBuf& sbuf,
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ULONG cb = 0,
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ULONG offLow = 0,
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ULONG offHigh = 0,
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BOOL fMapForWrite = FALSE );
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void Unmap ( CMmStreamBuf& sbuf );
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void Flush ( CMmStreamBuf& sbuf, ULONG cb, BOOL fThrowOnFailure = TRUE );
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void FlushMetaData ( BOOL fThrowOnFailure = TRUE );
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protected:
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IStream * _pStream; // Stream
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BYTE * _pBuf; // Stream is 'mapped' (buffered) here
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STATSTG _statstg; // Stream size, etc.
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};
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