Read, alter and write PDF files.
At the moment, you can only read PDF files.
One easy way you can contribute is to add different PDF files to tests/files and see if they pass the tests (cargo test).
Feel free to contribute with ideas, issues or code! You can also join the discussion on #rust-pdf on irc.mozilla.org.
There is a tool for visualizing a PDF file as an interactive hierarchy of primitives at inspect-prim. Just clone and cargo run.