pub fn update(checksum: [u8; 2], old: &[u8], new: &[u8]) -> [u8; 2]Expand description
Updates bytes in an existing checksum.
update updates a checksum to reflect that the already-checksummed bytes
old have been updated to contain the values in new. It implements the
algorithm described in Equation 3 in RFC 1624. The first byte must be at
an even number offset in the original input. If an odd number offset byte
needs to be updated, the caller should simply include the preceding byte as
well. If an odd number of bytes is given, it is assumed that these are the
last bytes of the input. If an odd number of bytes in the middle of the
input needs to be updated, the preceding or following byte of the input
should be added to make an even number of bytes.
ยงPanics
update panics if old.len() != new.len().