store: optimize _pathencode by checking the length of the unencoded path If the input path is already longer than _maxstorepathlen, then we can skip doing the basic encoding (encodedir, _encodefname and _auxencode) and directly proceed to the hashed encoding. Those encodings, if at all, will make the path only longer.

pathencode: skip encoding if input is already longer than maxstorepathlen Calling basicencode may make the path longer, never shorter. If it's already too long before, then we don't even need to basicencode it.

pathencode: simplify basicencode