ocation; mbs presumed valid */<b>
</b><p>  Note : in a ring buffer scenario (optional),
  blocks are presumed decompressed next to each other
  up to the moment there is not enough remaining space for next block (remainingSize < maxBlockSize),
  at which stage it resumes from beginning of ring buffer.
  When setting such a ring buffer for streaming decompression,
  provides the minimum size of this ring buffer
  to be compatible with any source respecting maxBlockSize condition.
 @return : minimum ring buff