$bufferStream : \GuzzleHttp\Stream\StreamInterface
Provides a buffer stream that can be written to to fill a buffer, and read from to remove bytes from the buffer.
This stream returns a "hwm" metadata value that tells upstream consumers what the configured high water mark of the stream is, or the maximum preferred size of the buffer.
__construct(\GuzzleHttp\Stream\StreamInterface $stream, \Pydio\Access\Core\Model\AJXP_Node $node, integer $hwm = -1)
High water mark, representing the preferred maximum buffer size. If the size of the buffer exceeds the high water mark, then calls to write will continue to succeed but will return false to inform writers to slow down until the buffer has been drained by reading from it.