81 lines
3.4 KiB
C++
81 lines
3.4 KiB
C++
// --------------------------------------------------------------------------------
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// Vstream.h
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// Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
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// Ronald E. Gray
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// --------------------------------------------------------------------------------
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#ifndef __VSTREAM_H
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#define __VSTREAM_H
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// --------------------------------------------------------------------------------
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// CVirtualStream
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// --------------------------------------------------------------------------------
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class CVirtualStream : public IStream
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{
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private:
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ULONG m_cRef; // Reference count
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DWORD m_cbSize; // Current size of the stream
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DWORD m_cbCommitted; // Amount of virtual space committed
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DWORD m_cbAlloc; // Amount of virtual space reserved
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DWORD m_dwOffset; // Current location in stream
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IStream * m_pstm; // File backed stream for overflow
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LPBYTE m_pb; // pointer to memory part of stream
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BOOL m_fFileErr; // the pointer in the file stream may not
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// be in sync with our pointer. Try to sync
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// before any other operation.
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CRITICAL_SECTION m_cs; // Thread Safety
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// -------------------------------------------------------------------------
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// Utilities
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// -------------------------------------------------------------------------
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HRESULT SyncFileStream();
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public:
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// -------------------------------------------------------------------------
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// Construction
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// -------------------------------------------------------------------------
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CVirtualStream(void);
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~CVirtualStream(void);
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// -------------------------------------------------------------------------
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// IUnknown
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// -------------------------------------------------------------------------
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STDMETHODIMP QueryInterface(REFIID, LPVOID *);
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STDMETHODIMP_(ULONG) AddRef(void);
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STDMETHODIMP_(ULONG) Release(void);
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// -------------------------------------------------------------------------
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// IStream
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// -------------------------------------------------------------------------
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#ifndef WIN16
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STDMETHODIMP Read(LPVOID, ULONG, ULONG *);
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#else
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STDMETHODIMP Read (VOID HUGEP *, ULONG, ULONG*);
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#endif // !WIN16
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STDMETHODIMP Seek(LARGE_INTEGER, DWORD, ULARGE_INTEGER *);
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#ifndef WIN16
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STDMETHODIMP Write(const void *, ULONG, ULONG *);
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#else
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STDMETHODIMP Write (const void HUGEP *, ULONG, ULONG*);
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#endif // !WIN16
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STDMETHODIMP Stat(STATSTG *, DWORD);
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STDMETHODIMP Commit(DWORD) {
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return S_OK; }
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STDMETHODIMP SetSize(ULARGE_INTEGER);
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STDMETHODIMP CopyTo(LPSTREAM, ULARGE_INTEGER, ULARGE_INTEGER *, ULARGE_INTEGER *);
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STDMETHODIMP Revert(void) {
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return E_NOTIMPL; }
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STDMETHODIMP LockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) {
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return E_NOTIMPL; }
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STDMETHODIMP UnlockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) {
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return E_NOTIMPL; }
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STDMETHODIMP Clone(LPSTREAM *) {
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return E_NOTIMPL; }
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// -------------------------------------------------------------------------
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// CVirtualStream
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// -------------------------------------------------------------------------
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void QueryStat(ULARGE_INTEGER *puliOffset, ULARGE_INTEGER *pulSize);
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};
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#endif // __VSTREAM_H
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