internal void MarkKeyAsDeleted(KeyIdentity identity) { try { string[] subkeys = identity.SplitPath(); int existingLevels, nonRemovableLevels; CalcNonRemovableLevels(null, identity, out existingLevels, out nonRemovableLevels); if (subkeys.Length <= nonRemovableLevels) { // We can't mark root keys as deleted return; } using (HGlobalPtr pData = new HGlobalPtr(Marshal.SizeOf(typeof(int)))) { Marshal.WriteInt32(pData.Ptr, 1); // Conciously suppressing errors OffRegKey key = null; try { key = new OffRegKey(this, hive_, KeyIdentity.Build(identity.BaseKey, subkeys, subkeys.Length - 1), null, Win32Api.RegOption.REG_OPTION_NON_VOLATILE, IntPtr.Zero, IntPtr.Zero); key.SetValue(DELETED_PREFIX + subkeys[subkeys.Length - 1], Win32Api.RegValueType.REG_DWORD, pData.Ptr, Marshal.SizeOf(typeof(int))); } catch (Win32Exception) { // Suppressing errors because there might be access issues // or may be other stuff if (key != null) { key.Close(); } } } } catch (FileNotFoundException) { // We don't know anything about the key, so we can't mark it as deleted return; } }
private DoesntExistOrMarkedAsDeletedState DoesntExistOrMarkedAsDeleted(KeyIdentity existingBase, KeyIdentity identity, IntPtr allocatedpData, IntPtr allocatedpcbData) { string[] subkeys = identity.SplitPath(); int existingLevels, nonRemovableLevels; CalcNonRemovableLevels(existingBase, identity, out existingLevels, out nonRemovableLevels); if (subkeys.Length <= nonRemovableLevels) { return(DoesntExistOrMarkedAsDeletedState.Exists); } for (int level = existingLevels; level < subkeys.Length; level++) { KeyIdentity curLevelIdentity = KeyIdentity.Build(identity.BaseKey, subkeys, level); KeyImplHolder holder; lock (this) { IKeyImpl keyImpl = null; if (level <= nonRemovableLevels) { keyImpl = cacheForDeletedMarks_.TryGet(curLevelIdentity, KeyDisposition.DIFF_HIVE, cacheSecurity_); } if (keyImpl != null) { holder = new NotOwningKeyImplHolder(keyImpl); } else { OffregLib.OffregKey key; OffregLib.Win32Result result; if (!hive_.Root.TryOpenSubKey(OffRegKey.GetMainOffRegPath(curLevelIdentity), out key, out result)) { return(DoesntExistOrMarkedAsDeletedState.DoesntExist); } holder = new KeyImplHolder(new OffRegKey(this, key, curLevelIdentity)); if (level <= nonRemovableLevels) { // Adding to cache only the lowest, non removable level holder = cacheForDeletedMarks_.Add( curLevelIdentity, KeyDisposition.DIFF_HIVE, holder); } } } using (holder) { Marshal.WriteInt32(allocatedpcbData, Marshal.SizeOf(typeof(int))); if (holder.GetKeyImpl().TryQueryValue( DELETED_PREFIX + subkeys[level], IntPtr.Zero, IntPtr.Zero, allocatedpData, allocatedpcbData)) { if (Marshal.ReadInt32(allocatedpcbData) == Marshal.SizeOf(typeof(int)) && Marshal.ReadInt32(allocatedpData) != 0) { // There is a special value marking key as deleted return(DoesntExistOrMarkedAsDeletedState.MarkedAsDeleted); } } } } return(DoesntExistOrMarkedAsDeletedState.Exists); }