This is an assignment of cs course, but it works quite good, I think. If you upload 2 files with similar content, a lot of space can be saved (deduplicated).

Remote storage is not implemented yet.

java -jar program_name upload <min_chunk> <avg_chunk> <max_chunk> <prime d> <local_file_name> <local|remote>
java -jar program_name download <remote_file_name>
java -jar program_name delete <remote_file_name>

There is a handy command java -jar program_name list <local|remote> to show what files are stored.

maven is used for project management. Make sure have maven installed. mapdb (pure java database) is included as dependency. It will be downloaded automatically.

compile: mvn compile

run junit tests: mvn test

make a jar: mvn package

There are some unit test, but the coverage is not very good. Better than nothing.