scala – 如何在ByteString中获取迭代器的当前位置？

我读了一些数据,然后我决定创建一个视图(一些数据块的独立迭代器).

我不能使用原始迭代器的slice(),因为这会使它无法使用,因为docs说：

After calling this method,one should discard the iterator it was called on,and use only the iterator that was returned. Using the old
iterator is undefined,subject to change,and may result in changes to
the new iterator as well.

所以,似乎我需要在ByteString上调用slice().但是slice()有from和until参数,我不知道.我需要这样的东西：

ByteString originalByteString = ...; // <-- This is my input data
ByteIterator originalIterator = originalByteString .iterator();
...
read some data from originalIterator
...
int length = 100; // < -- Size of the view
int from = originalIterator.currentPosition(); // <-- I need this
int until = from + length;
ByteString viewOfOriginalByteString = originalByteString.slice(from,until);
ByteIterator iteratorForView = viewOfOriginalByteString.iterator(); // <-- This is my goal

更新：

尝试使用duplicate()执行此操作：

ByteIterator iteratorForView = originalIterator.duplicate()._2.take(length);