/*
   Bacula® - The Network Backup Solution

   Copyright (C) 2006-2007 Free Software Foundation Europe e.V.

   The main author of Bacula is Kern Sibbald, with contributions from
   many others, a complete list can be found in the file AUTHORS.
   This program is Free Software; you can redistribute it and/or
   modify it under the terms of version two of the GNU General Public
   License as published by the Free Software Foundation and included
   in the file LICENSE.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.

   Bacula® is a registered trademark of John Walker.
   The licensor of Bacula is the Free Software Foundation Europe
   (FSFE), Fiduciary Program, Sumatrastrasse 25, 8006 Zürich,
   Switzerland, email:ftf@fsfeurope.org.
*/
/*                               -*- Mode: C -*-
 * vss.h --
 */
//
// Copyright transferred from MATRIX-Computer GmbH to
//   Kern Sibbald by express permission.
/*
 *
 * Author          : Thorsten Engel
 * Created On      : Fri May 06 21:44:00 2006 
 */

#ifndef __VSS_H_
#define __VSS_H_

#ifndef b_errno_win32
#define b_errno_win32 (1<<29)
#endif
 
#ifdef WIN32_VSS

// some forward declarations
struct IVssAsync;

class VSSClient
{
public:
    VSSClient();
    virtual ~VSSClient();

    // Backup Process
    BOOL InitializeForBackup();
    virtual BOOL CreateSnapshots(char* szDriveLetters) = 0;
    virtual BOOL CloseBackup() = 0;
    virtual const char* GetDriverName() = 0;
    BOOL GetShadowPath  (const char* szFilePath, char* szShadowPath, int nBuflen);
    BOOL GetShadowPathW (const wchar_t* szFilePath, wchar_t* szShadowPath, int nBuflen); /* nBuflen in characters */

    const size_t GetWriterCount();
    const char* GetWriterInfo(int nIndex);
    const int   GetWriterState(int nIndex);
    void DestroyWriterInfo();
    void AppendWriterInfo(int nState, const char* pszInfo);
    const BOOL  IsInitialized() { return m_bBackupIsInitialized; };
         
private:
    virtual BOOL Initialize(DWORD dwContext, BOOL bDuringRestore = FALSE) = 0;
    virtual BOOL WaitAndCheckForAsyncOperation(IVssAsync*  pAsync) = 0;
    virtual void QuerySnapshotSet(GUID snapshotSetID) = 0;

protected:
    HMODULE                         m_hLib;

    BOOL                            m_bCoInitializeCalled;
    BOOL                            m_bCoInitializeSecurityCalled;
    DWORD                           m_dwContext;

    IUnknown*                       m_pVssObject;
    GUID                            m_uidCurrentSnapshotSet;
    // TRUE if we are during restore
    BOOL                            m_bDuringRestore;
    BOOL                            m_bBackupIsInitialized;

    // drive A will be stored on position 0,Z on pos. 25
    wchar_t                           m_wszUniqueVolumeName[26][MAX_PATH]; // approx. 7 KB
    wchar_t                           m_szShadowCopyName[26][MAX_PATH]; // approx. 7 KB
    
    void*                           m_pAlistWriterState;
    void*                           m_pAlistWriterInfoText;
};

class VSSClientXP:public VSSClient
{
public:
   VSSClientXP();
   virtual ~VSSClientXP();
   virtual BOOL CreateSnapshots(char* szDriveLetters);
   virtual BOOL CloseBackup();
   virtual const char* GetDriverName() { return "VSS WinXP"; };
private:
   virtual BOOL Initialize(DWORD dwContext, BOOL bDuringRestore);
   virtual BOOL WaitAndCheckForAsyncOperation(IVssAsync* pAsync);
   virtual void QuerySnapshotSet(GUID snapshotSetID);
   BOOL CheckWriterStatus();   
};

class VSSClient2003:public VSSClient
{
public:
   VSSClient2003();
   virtual ~VSSClient2003();
   virtual BOOL CreateSnapshots(char* szDriveLetters);
   virtual BOOL CloseBackup();   
   virtual const char* GetDriverName() { return "VSS Win 2003"; };
private:
   virtual BOOL Initialize(DWORD dwContext, BOOL bDuringRestore);
   virtual BOOL WaitAndCheckForAsyncOperation(IVssAsync*  pAsync);
   virtual void QuerySnapshotSet(GUID snapshotSetID);
   BOOL CheckWriterStatus();
};

class VSSClientVista:public VSSClient
{
public:
   VSSClientVista();
   virtual ~VSSClientVista();
   virtual BOOL CreateSnapshots(char* szDriveLetters);
   virtual BOOL CloseBackup();   
   virtual const char* GetDriverName() { return "VSS Vista"; };
private:
   virtual BOOL Initialize(DWORD dwContext, BOOL bDuringRestore);
   virtual BOOL WaitAndCheckForAsyncOperation(IVssAsync*  pAsync);
   virtual void QuerySnapshotSet(GUID snapshotSetID);
   BOOL CheckWriterStatus();
};


extern VSSClient *g_pVSSClient;

#endif /* WIN32_VSS */

#endif /* __VSS_H_ */