code: def readInfo(stream):
          
          try:
              for line in stream:
                  (toUUID, fromUUID, size) = line.split()
                  try:
                      size = int(size)
                  except Exception:
                      logger.warning("Bad size: %s", size)
                      continue
                  logger.debug("diff info: %s %s %d", toUUID, fromUUID, size)
                  Diff.theKnownSizes[toUUID][fromUUID] = size
          except Exception as error:
              logger.warn("Can't read .bs info file (%s)", error)
docs: Read previously-written information about diffs.