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Package chunks provides the basic structure for a pair of the weak and strong checksums.

package filechecksum provides the FileChecksumGenerator, whose main responsibility is to read a file, and generate both weak and strong checksums for every block.

Package index provides the functionality to describe a reference 'file' and its contents in terms of the weak and strong checksums, in such a way that you can check if a weak checksum is present, then check if there is a strong checksum that matches.

rollsum provides an implementation of a rolling checksum - a checksum that's efficient to advance a byte or more at a time.