Fix file and logger reference ownership

Handle/BNFileMetadata.cs

@@ -46,6 +46,26 @@ internal static FileMetadata MustTakeHandle(IntPtr handle)
 
 			return new FileMetadata(handle, true);
 		}
+
+		internal static FileMetadata? NewFromHandle(IntPtr handle)
+		{
+			if (IntPtr.Zero == handle)
+			{
+				return null;
+			}
+
+			return new FileMetadata(NativeMethods.BNNewFileReference(handle), true);
+		}
+
+		internal static FileMetadata MustNewFromHandle(IntPtr handle)
+		{
+			if (IntPtr.Zero == handle)
+			{
+				throw new ArgumentNullException(nameof(handle));
+			}
+
+			return new FileMetadata(NativeMethods.BNNewFileReference(handle), true);
+		}
 
 		internal static FileMetadata? BorrowHandle(IntPtr handle)
 		{
@@ -77,6 +97,12 @@ public static FileMetadata FromFile(string filename)
 			return file;
 		}
 
+		/// <summary>Acquires an independent native reference to this file metadata object.</summary>
+		public FileMetadata Duplicate()
+		{
+			return FileMetadata.MustNewFromHandle(this.handle);
+		}
+
 		protected override bool ReleaseHandle()
 		{
 			if (!this.IsInvalid)
@@ -87,7 +113,6 @@ protected override bool ReleaseHandle()
 					this.navigationHandler = null;
 				}
 
-				NativeMethods.BNCloseFile(this.handle);
 				NativeMethods.BNFreeFileMetadata(this.handle);
 				this.SetHandleAsInvalid();
 			}

Handle/BNLogger.cs

@@ -38,6 +38,26 @@ internal static Logger MustTakeHandle(IntPtr handle)
 
 		    return new Logger(handle, true);
 	    }
+
+	    internal static Logger? NewFromHandle(IntPtr handle)
+	    {
+		    if (IntPtr.Zero == handle)
+		    {
+			    return null;
+		    }
+
+		    return new Logger(NativeMethods.BNNewLoggerReference(handle), true);
+	    }
+
+	    internal static Logger MustNewFromHandle(IntPtr handle)
+	    {
+		    if (IntPtr.Zero == handle)
+		    {
+			    throw new ArgumentNullException(nameof(handle));
+		    }
+
+		    return new Logger(NativeMethods.BNNewLoggerReference(handle), true);
+	    }
 
 	    public static Logger? GetLogger(string name , ulong sessionId = 0)
 	    {
@@ -81,6 +101,12 @@ public static Logger GetOrCreateLogger(string name , ulong sessionId = 0)
 		    );
 	    }
 
+	    /// <summary>Acquires an independent native reference to this logger.</summary>
+	    public Logger Duplicate()
+	    {
+		    return Logger.MustNewFromHandle(this.handle);
+	    }
+
 	    public static string[] GetLoggerNames()
 	    {
 		    IntPtr arrayPointer = NativeMethods.BNLogGetLoggerNames(out ulong arrayLength);
@@ -161,4 +187,4 @@ public void LogAlert(string format , params object[] args)
 		    this.LogString( LogLevel.AlertLog ,  text );
 	    }
 	}
-}
+}