77 lines
3.6 KiB
C++
77 lines
3.6 KiB
C++
// --------------------------------------------------------------------------------
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// Bytestm.h
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// Copyright (c)1993-1995 Microsoft Corporation, All Rights Reserved
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// Steven J. Bailey
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// --------------------------------------------------------------------------------
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#ifndef __BYTESTM_H
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#define __BYTESTM_H
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// -----------------------------------------------------------------------------
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// Acquire Byte Stream Data Types
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// -----------------------------------------------------------------------------
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typedef enum tagACQUIRETYPE {
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ACQ_COPY, // Don't reset the object (CByteStream will free m_pbData)
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ACQ_DISPLACE // ResetObject after acquire, the caller owns the bits
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} ACQUIRETYPE;
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// -----------------------------------------------------------------------------
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// CByteStream
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// -----------------------------------------------------------------------------
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class CByteStream : public IStream
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{
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public:
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// -------------------------------------------------------------------------
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// Construction
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// -------------------------------------------------------------------------
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CByteStream(LPBYTE pb=NULL, ULONG cb=0);
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~CByteStream(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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STDMETHODIMP Read(LPVOID, ULONG, ULONG *);
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STDMETHODIMP Seek(LARGE_INTEGER, DWORD, ULARGE_INTEGER *);
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STDMETHODIMP Stat(STATSTG *, DWORD);
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STDMETHODIMP Write(const void *, ULONG, ULONG *);
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STDMETHODIMP SetSize(ULARGE_INTEGER);
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STDMETHODIMP Commit(DWORD) { return S_OK; }
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STDMETHODIMP CopyTo(LPSTREAM, ULARGE_INTEGER, ULARGE_INTEGER *, ULARGE_INTEGER *) { return E_NOTIMPL; }
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STDMETHODIMP Revert(void) { return E_NOTIMPL; }
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STDMETHODIMP LockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) { return E_NOTIMPL; }
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STDMETHODIMP UnlockRegion(ULARGE_INTEGER, ULARGE_INTEGER, DWORD) { return E_NOTIMPL; }
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STDMETHODIMP Clone(LPSTREAM *) { return E_NOTIMPL; }
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// -------------------------------------------------------------------------
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// CByteStream Methods
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// -------------------------------------------------------------------------
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void AcquireBytes(ULONG *pcb, LPBYTE *ppb, ACQUIRETYPE actype);
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HRESULT HrAcquireStringA(ULONG *pcch, LPSTR *ppszStringA, ACQUIRETYPE actype);
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HRESULT HrAcquireStringW(ULONG *pcch, LPWSTR *ppszStringW, ACQUIRETYPE actype);
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private:
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// -------------------------------------------------------------------------
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// Private Methods
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// -------------------------------------------------------------------------
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void ResetObject(void);
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HRESULT _HrGrowBuffer(ULONG cbNeeded, ULONG cbExtra);
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private:
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// -------------------------------------------------------------------------
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// Private Data
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// -------------------------------------------------------------------------
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ULONG m_cRef; // Reference count
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ULONG m_cbData; // Number of valid bytes in m_pbData
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ULONG m_cbAlloc; // Current allocated size of m_pbData
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ULONG m_iData; // Current data index
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LPBYTE m_pbData; // Pointer to data buffer
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};
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#endif // __BYTESTM_H
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