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Wraps any bytes-based receive stream and uses a buffer to provide sophisticated
receiving capabilities in the form of a byte stream.
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Read exactly the given amount of bytes from the stream.
:param nbytes: the number of bytes to read
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:raises ~anyio.IncompleteRead: if the stream was closed before the requested
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Read from the stream until the delimiter is found or max_bytes have been read.
:param delimiter: the marker to look for in the stream
:param max_bytes: maximum number of bytes that will be read before raising
:exc:`~anyio.DelimiterNotFound`
:return: the bytes read (not including the delimiter)
:raises ~anyio.IncompleteRead: if the stream was closed before the delimiter
was found
:raises ~anyio.DelimiterNotFound: if the delimiter is not found within the
bytes read up to the maximum allowed
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