CSharpUtils.Streams.MapStream._Transfer C# (CSharp) Метод

		private long _Transfer(byte[] Buffer, long Offset, long Count, Func<byte[], long, long, long> Method)
		{
			if (Count == 0) return 0;

			_PrepareCurrentStream();
			if (_CurrentStream == null) throw (new InvalidOperationException(String.Format("Invalid/Unmapped MapStream position {0}", Position)));

			var AvailableCount = GetAvailableBytesOnCurrentStream();

			if (Count > AvailableCount)
			{
				// Read from current Stream.
				var Readed1 = _Transfer(Buffer, Offset, AvailableCount, Method);

				if (Readed1 == 0)
				{
					return 0;
				}
				else
				{
					// Try to read from the next Stream.
					var Readed2 = _Transfer(Buffer, Offset + AvailableCount, Count - AvailableCount, Method);

					return Readed1 + Readed2;
				}
			}
			else
			{
				long ActualReaded = 0;

				//_PrepareCurrentStream();
				_CurrentStream.PreservePositionAndLock(() =>
				{
					_CurrentStream.Position = _CurrentStreamPosition;
					ActualReaded = Method(Buffer, Offset, Count);
				});

				Position += ActualReaded;

				return ActualReaded;
			}
		}