185 lines
5.2 KiB
C++
185 lines
5.2 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996 - 1998
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//
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// File: FatNot.hxx
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//
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// Contents: Downlevel notification.
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//
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// Classes: CGenericNotify
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//
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// History: 2-23-96 KyleP Lifed from DLNotify.?xx
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//
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//----------------------------------------------------------------------------
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#pragma once
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class CImpersonateRemoteAccess;
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class PCatalog;
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//+---------------------------------------------------------------------------
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//
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// Class: CGenericNotify
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//
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// Purpose: A single scope to watch for notifications.
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//
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// History: 1-17-96 srikants Created
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//
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//----------------------------------------------------------------------------
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class CGenericNotify : public CDoubleLink
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{
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//
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// size of the buffer used for retrieving notifications. Too small
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// a buffer can cause overflows requiring expensive full scans of the
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// scope.
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//
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enum { CB_NOTIFYBUFFER = 32 * 1024,
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CB_REMOTENOTIFYBUFFER = 64 * 1024, // start big
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CB_DELTAINCR = 4 * 1024,
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CB_MAXSIZE = 64 * 1024 };
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friend class CRemoteNotifications;
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friend class CStartRemoteNotifications;
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friend class COpenRemoteNotifications;
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public:
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//
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// Constructors, Destructors, and Initializers
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//
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CGenericNotify( PCatalog * pCatalog,
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WCHAR const * wcsScope,
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unsigned cwcScope,
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BOOL fDeep = TRUE,
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BOOL fLogEvents = FALSE );
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virtual ~CGenericNotify();
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//
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// The magic API
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//
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virtual void DoIt() = 0;
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virtual void ClearNotifyEnabled()
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{
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//
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// override if necessary to set the flag. MUST be done under some
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// kind of lock to prevent races.
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//
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}
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//
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// Refcounting
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//
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void AddRef();
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void Release();
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//
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// Member variable access
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//
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WCHAR const * GetScope() const { return _wcsScope; }
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unsigned ScopeLength() const { return _cwcScope; }
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BOOL LokIsNotifyEnabled() const { return _fNotifyActive; }
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void LokClearNotifyEnabled() { _fNotifyActive = FALSE; }
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void LokStartIf()
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{
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if ( !_fNotifyActive )
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StartNotification();
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}
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void LokEnableIf()
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{
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if ( 0 == _hNotify )
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{
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EnableNotification();
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}
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else if ( !_fNotifyActive )
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{
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StartNotification();
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}
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}
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protected:
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void StartNotification( NTSTATUS * pStatus = 0 );
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void EnableNotification();
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void DisableNotification();
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BYTE * GetBuf() { return _pbBuffer; }
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unsigned BufLength() { return (unsigned)_iosNotify.Information; }
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BOOL BufferOverflow() { return _fOverflow; }
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void LogNoNotifications( DWORD dwError ) const;
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void LogNotificationsFailed( DWORD dwError ) const;
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void LogDfsShare() const;
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const BOOL _fLogEvents; // Set to TRUE if events should be logged on
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// serious failures.
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BOOL _fAbort; // Set to TRUE when an abort is in
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// progress.
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PCatalog * GetCatalog() { return _pCat; }
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static BOOL IsDfsShare( WCHAR const * wszPath, ULONG len );
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static BOOL IsFixedDrive( WCHAR const * wszPath, ULONG len );
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# ifdef CIEXTMODE
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void CiExtDump(void *ciExtSelf) const;
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# endif
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private:
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static void WINAPI APC( void * ApcContext,
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IO_STATUS_BLOCK * IoStatusBlock,
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ULONG Reserved );
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void AdjustForOverflow();
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NTSTATUS OpenDirectory( OBJECT_ATTRIBUTES & objAttr );
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void CloseDirectory();
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static DWORD GetNotifyFlags()
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{
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return FILE_NOTIFY_CHANGE_FILE_NAME |
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FILE_NOTIFY_CHANGE_DIR_NAME |
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FILE_NOTIFY_CHANGE_SIZE |
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FILE_NOTIFY_CHANGE_LAST_WRITE |
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FILE_NOTIFY_CHANGE_ATTRIBUTES |
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FILE_NOTIFY_CHANGE_SECURITY;
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}
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long _refCount;
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PCatalog * _pCat;
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WCHAR _wcsScope[MAX_PATH]; // Notification scope
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ULONG _cwcScope; // Length of the path - for quick compare
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BOOL _fNotifyActive; // Set to TRUE if notifications are active
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BOOL _fDeep; // Set to TRUE if deep scope notifications
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// are being used
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BOOL _fRemoteDrive; // Set to TRUE if this is a remote
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// drive.
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// NtIoApi related data members
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HANDLE _hNotify; // Handle of the root for notifications
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IO_STATUS_BLOCK _iosNotify;
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BOOL _fOverflow; // TRUE if notification overflowed buffer
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unsigned _cbBuffer; // Size of buffer in use (smaller for net drives)
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BYTE * _pbBuffer; // Buffer for storing the notifications
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};
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