Zopfli in Rust
This is a reimplementation of the Zopfli compression tool in Rust.
I have totally ignored zopflipng.
More info about why and how I did this can be found in the slides for a talk I gave about it.
How to build
To build the code, run:
$ cargo build --release
and the executable will be in
This should work on stable or beta Rust.
You can also run
make zopfli, which will run
cargo build and then symlink
target/release/zopfli to just
zopfli in the project root; this is what the C library does and it was useful for scripting purposes during the rewrite process to keep the command and resulting artifacts the same.
Running the tests
There are some unit tests, mostly around the boundary package merge algorithm implementation in katajainen.rs, that can be run with:
$ cargo test
Golden master tests, to check that compressed files are exactly the same as the C implementation would generate, can be run using:
and then checking that git reports no changes to the files in
Or you can run
make test, which will run
cargo test, then
./test/run.sh, and then will fail if there are any changed files according to git. Note that if you have uncommitted changes and you run this, your changes will cause this command to fail, but the tests actually passed.