XPSTREAM.H

/////////////////////////////////////////////////////////////////////////////// 
// 
//  File Name  
//      XPSTREAM.H 
// 
//  Description 
//      Interface declaraction file for CCachedStream. 
// 
//  Author 
//      Irving De la Cruz 
// 
//  Note: This file is the C++ version of the buffered IStream wrapper 
//        developed originally for the C-based MSPEER transport in 
//        the MAPI SDK samples. 
// 
//  Revision: 1.7 
// 
// Written for Microsoft Windows Developer Support 
// Copyright (c) 1995-1996 Microsoft Corporation. All rights reserved. 
// 
#ifndef _XPSTREAM_H 
#define _XPSTREAM_H 
 
#define STRICT 
#include <WINDOWS.H> 
#include <MAPIWIN.H> 
#include <MAPISPI.H> 
#include <MAPIUTIL.H> 
 
#define XPSOF_BUFF_MAX      4096 
#define XPSOF_READ          0x00000001 
#define XPSOF_WRITE         0x00000002 
#define XPSOF_READWRITE     (XPSOF_WRITE | XPSOF_READ) 
 
class CCachedStream : public IStream 
{ 
public: 
/////////////////////////////////////////////////////////////////////////////// 
// IUnknown virtual member functions 
// 
    inline STDMETHODIMP QueryInterface 
                    (REFIID                     riid, 
                     LPVOID *                   ppvObj) 
                    { *ppvObj = NULL; 
                      if (riid == IID_IStream || riid == IID_IUnknown) 
                      { 
                          *ppvObj = (LPVOID)this; 
                          // Increase usage count of this object 
                          AddRef(); 
                          return S_OK; 
                      } 
                      return E_NOINTERFACE; 
                    }; 
    inline STDMETHODIMP_(ULONG) AddRef 
                    () { ++m_cRef; return m_cRef; }; 
    inline STDMETHODIMP_(ULONG) Release 
                    () { ULONG ulCount = --m_cRef; 
                         if (!ulCount) { delete this; } 
                         return ulCount;}; 
/////////////////////////////////////////////////////////////////////////////// 
// IStream virtual member functions 
// 
    STDMETHODIMP Read 
                    (void *                     pv, 
                     ULONG                      cb, 
                     ULONG *                    pcbRead); 
    STDMETHODIMP Write 
                    (const void *               pv, 
                     ULONG                      cb, 
                     ULONG *                    pcbWritten); 
    STDMETHODIMP Seek 
                    (LARGE_INTEGER              dlibMove, 
                     DWORD                      dwOrigin, 
                     ULARGE_INTEGER *           plibNewPosition); 
    STDMETHODIMP CopyTo 
                    (IStream *                  pstm, 
                     ULARGE_INTEGER cb, 
                     ULARGE_INTEGER *           pcbRead, 
                     ULARGE_INTEGER *           pcbWritten); 
    STDMETHODIMP Commit 
                    (DWORD                      grfCommitFlags); 
    inline STDMETHODIMP SetSize 
                    (ULARGE_INTEGER             libNewSize) 
                     { return m_pImpStream->SetSize (libNewSize); }; 
    inline STDMETHODIMP Revert 
                    () 
                     { return m_pImpStream->Revert(); }; 
    inline STDMETHODIMP LockRegion 
                    (ULARGE_INTEGER             libOffset, 
                     ULARGE_INTEGER             cb, 
                     DWORD                      dwLockType) 
                     { return m_pImpStream->LockRegion (libOffset, cb, dwLockType); }; 
    inline STDMETHODIMP UnlockRegion 
                    (ULARGE_INTEGER             libOffset, 
                     ULARGE_INTEGER             cb, 
                     DWORD                      dwLockType) 
                     { return m_pImpStream->UnlockRegion (libOffset, cb, dwLockType); }; 
    inline STDMETHODIMP Stat 
                    (STATSTG *                  pstatstg, 
                     DWORD                      grfStatFlag) 
                     { return m_pImpStream->Stat (pstatstg, grfStatFlag); }; 
    inline STDMETHODIMP Clone 
                    (IStream **                 ppstm) 
                     { return m_pImpStream->Clone (ppstm); }; 
 
/////////////////////////////////////////////////////////////////////////////// 
// Other member functions specific to this class 
// 
private: 
    HRESULT WINAPI RewindStream 
                    (ULONG                      ib); 
     
/////////////////////////////////////////////////////////////////////////////// 
// Constructors and destructors 
public : 
    CCachedStream   (LPSTREAM                   pImpStream, 
                     DWORD                      ulFlags); 
    ~CCachedStream  (); 
 
/////////////////////////////////////////////////////////////////////////////// 
// Data members 
public : 
    ULONG               m_cRef; 
    BOOL                m_fDirty; 
    LPSTREAM            m_pImpStream; 
    ULONG               m_ulFlags; 
    LPVOID              m_pvCache; 
    ULONG               m_libBuff; 
    ULONG               m_cbBuffMac; 
}; 
 
#endif // _XPSTREAM_H 
 
// End of file for XPSTREAM.H