Leaked source code of windows server 2003
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//-----------------------------------------------------------------------------
//
// File: cowblob.h
// Copyright (C) 1994-1997 Microsoft Corporation
// All rights reserved.
//
// Copy-On-Write (COW) blob class. Hold binary information, but only copies
// the data when it's written to.
//
// Owner: MHotchin
//
// Code Review Status: Reviewed
//
//-----------------------------------------------------------------------------
#ifndef COWBLOB_H
#define COWBLOB_H
class LTAPIENTRY CLocCOWBlob {public: CLocCOWBlob(); CLocCOWBlob(const CLocCOWBlob &);
void AssertValid(void) const;
LTASSERTONLY(UINT GetWriteCount(void) const); UINT GetBlobSize(void) const; void SetBlobSize(UINT); void ReallocBlob(UINT); void SetGrowSize(UINT); void *GetPointer(void); void ReleasePointer(void); void SetBuffer(const void *, size_t); operator const void *(void) const;
const CLocCOWBlob &operator=(const CLocCOWBlob &); void Serialize(CArchive &ar); void Load(CArchive &ar); void Store(CArchive &ar) const; ~CLocCOWBlob();
// Comparison operators
//
NOTHROW int operator==(const CLocCOWBlob &) const; NOTHROW int operator!=(const CLocCOWBlob &) const;
protected:
private: typedef struct { DWORD RefCount; DWORD AllocSize; DWORD RequestedSize; } BlobHeader;
NOTHROW void Attach(const CLocCOWBlob &); NOTHROW void Detach(void); NOTHROW void MakeWritable(void); NOTHROW BYTE * DataPointer(void) const; NOTHROW BlobHeader * GetBlobHeader(void); NOTHROW const BlobHeader * GetBlobHeader(void) const; NOTHROW DWORD & GetRefCount(void); NOTHROW DWORD GetAllocatedSize(void) const; NOTHROW DWORD GetRequestedSize(void) const; NOTHROW DWORD CalcNewSize(DWORD) const; BOOL Compare(const CLocCOWBlob &) const; BYTE *m_pBuffer; DWORD m_WriteCount; UINT m_uiGrowSize; static const UINT m_uiDefaultGrowSize;
#ifdef _DEBUG
static CCounter m_UsageCounter; void FillEndZone(void); void CheckEndZone();#endif
};
#if !defined(_DEBUG) || defined(IMPLEMENT)
#include "cowblob.inl"
#endif
#endif // COWBLOB_H
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