Leaked source code of windows server 2003
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//-----------------------------------------------------------------------------
//
// File: _blobfile.h
// Copyright (C) 1994-1997 Microsoft Corporation
// All rights reserved.
//
//
//
//-----------------------------------------------------------------------------
#ifndef ESPUTIL_BLOBFILE_H
#define ESPUTIL_BLOBFILE_H
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// Class CBlobFile is similar to CMemFile, except that it is implemented
// with a CLocCOWBlob
//------------------------------------------------------------------------------
//
// The compiler worries when you export a class that has a base class
// that is not exported. Since I *know* that CFile is exported
// tell the compliler that this really isn't a problem right here.
//
#pragma warning(disable : 4275)
class LTAPIENTRY CBlobFile : public CFile{ DECLARE_DYNAMIC(CBlobFile)
public: // Constructor
CBlobFile(UINT nGrowBytes = 0); CBlobFile(const CLocCOWBlob &, UINT nGrowBytes = 0); virtual ~CBlobFile();
virtual void AssertValid() const; UINT GetBlobSize(void) const;
virtual DWORD GetPosition() const; BOOL GetStatus(CFileStatus& rStatus) const; virtual LONG Seek(LONG lOff, UINT nFrom); virtual DWORD GetLength() const; virtual void SetLength(DWORD dwNewLen); virtual UINT Read(void* lpBuf, UINT nCount); virtual void Write(const void* lpBuf, UINT nCount); virtual void Abort(); virtual void Flush(); virtual void Close(); virtual UINT GetBufferPtr(UINT nCommand, UINT nCount = 0, void** ppBufStart = NULL, void** ppBufMax = NULL);
//
// These operators can't work on const objects, since they
// 'fix up' the blob size.
//
operator const CLocCOWBlob &(void); const CLocCOWBlob &GetBlob(void); // Unsupported APIs
virtual CFile* Duplicate() const; virtual void LockRange(DWORD dwPos, DWORD dwCount); virtual void UnlockRange(DWORD dwPos, DWORD dwCount);
protected: // Advanced Overridables
virtual BYTE* Memcpy(BYTE* lpMemTarget, const BYTE* lpMemSource, UINT nBytes); virtual void GrowFile(DWORD dwNewLen);
protected: // Implementation
UINT m_nGrowBytes; //unit of growth of 'm_blobData'
const UINT cm_nDefaultGrowth; //default unit of growth
DWORD m_nPosition; //current position within file
DWORD m_nFileSize; //actual number of bytes written to the file
CLocCOWBlob m_blobData; //file data
BYTE * m_pBuffer; //pointer to buffer in blob
};
#pragma warning(default : 4275)
#if !defined(_DEBUG) || defined(IMPLEMENT)
#include "blobfile.inl"
#endif
#endif // BLOBFILE_H_
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