[Box Backup] Experimental questions on boxbackup

[Noah yan]

Dear All,

I am doing some experiment on boxbackup for its performance. Several
questions about the rollingchecksum of rsync: thanks in advance for
answering
1. What the block size of each file are splited to calculate its
checksum? Or what is the range if it is fixed
2. What if there are overflow when calcualting the sum, such as the a
and b in rollingchecksum algorithm. I noticed that a is 16bit as sum
for 8bit data, how overflow is handled if have in the algorithm, or
other ways to avoid this?

Thanks very much for answering
Noah Yan