roduces a no-copy setup mechanism,
  in which the working stream references the dictionary stream in-place.

  Several assumptions are made about the state of the dictionary stream.
  Currently, only streams which have been prepared by LZ4_loadDict() should
  be expected to work.

  Alternatively, the provided dictionary stream pointer may be NULL, in which
  case any existing dictionary stream is unset.

  If a dictionary is provided, it replaces any pre-existing stream history.
  The dictionary contents a