Compile with LTO in release builds
Allow compilation without visual_data feature enabled
Fix default features for dependencies


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Physis is a framework for interacting with FFXIV data. Designed for reading (and writing) the relevant game formats of FFXIV, as well as making documentation readily accessible for other developers hoping to do the same. Although this library works best as a Rust crate, libphysis is a C API wrapper designed for other languages.


  • Make it easy for people to tinker around with game data.
  • Documenting game formats for other people to develop their own libraries and applications for.
  • Parsing data should be safe, and unit tested vigorously.
  • Aim to have minimal dependencies, and those dependencies should be checked via cargo deny.


  • Easily extract game data from SqPack files.
  • Apply game and boot updates, enabling custom launchers to patch the game easily.
  • Blockfish ciphers for encrypting and decrypting SqexArg.
  • Parse various game formats:
    • SqPack index and dat files
    • ZiPatch files
    • All three Excel data types (EXD, EXH, EXL)
    • Models
    • Havok Packfile/TexTool skeletons
    • Textures
    • Materials
    • and more!


Warning: The API will not be truly stable until 1.0. However, the API is stable between patch versions.

If you intend to use this in your Rust project, you can simply include this crate directly.

physis = "0.1"

You can view the documentation at docs.xiv.zone! It's automatically updated as new commits are pushed to the main branch.

For other use in languages I maintain libphysis, which is a C wrapper around the same functionality. I use these bindings in other projects.


If you're interested to see how these formats work in more detail, see xiv.dev and docs.xiv.zone! They explain the file formats in more detail, but I also encourage reading the ibrary code as well if you can.


One of the main goals of Physis is to avoid accidental regressions, this is especially important when handling game data that might take hours to redownload.

#Unit Testing

There are a set of basic unit tests you can run via cargo test. You can also find the relevant test resources in resources/tests. This does NOT contain copyrighted material, but actually fake game data created by physis itself. These tests are run automatically by the CI.

#Retail Testing

There are some tests and benchmarks require the environment variable FFXIV_GAME_DIR to be set. By default, these are disabled since they require a legitimate copy of the retail game data. These tests can be turned on via the retail_game_testing feature.

#Patch Testing

Patching is an extremely sensitive operation since it is not easily reversible if done wrong. Repairing the game files is an option, but it's time-consuming and not yet implemented in physis. To prevent regressions in patching the game, I have set up a testing bed for cross-checking our implementation with others. Currently, this is limited to XIVLauncher's implementation, but I will eventually adopt a way to test the retail patch installer as well.

  1. Enable the patch_testing feature.
  2. Set a couple of environment variables:
    • FFXIV_PATCH_DIR is the directory of patches to install. It should be structured as $FFXIV_PATCH_DIR/game/D2017.07.11.0000.0001.patch.
    • FFXIV_XIV_LAUNCHER_PATCHER should be the path to the XIVLauncher patcher executable. If you're running on Linux, we will handle running Wine for you.
    • FFXIV_INSTALLER is the path to the installer executable. This will be installed using the usual InstallShield emulation physis already includes.

As you can see, you must have the previous patches downloaded first as well as the installer before running the tests. This is left up to the developer to figure out how to download them legally.

Note: These tests create the game_test and game_test_xivlauncher folders in $HOME and does not delete them on exit, in case you want to check on the results. You may want to remove these folders as they are full game installations and take up a considerable amount of space.

#Semver and Dependency Checks

Even though package management in Rust is easier, it's a double edged sword. I try to prevent getting carried away from including crates - but the ones we do include, have to get checked often. I use cargo deny to check my dependencies for mismatched versions, deprecation warnings, updates and more. This is also run on the CI!

Making sure that the library is semver-compliant is also important, and I use cargo semver for this task. This is to ensure the API does not break when moving between patch versions.

#Contributing & Support

The best way you can help is by monetarily supporting me or by submitting patches to help fix bugs or add functionality.


  • goatcorp (XIVQuickLauncher, docs.xiv.dev, and even more)
  • Ioncannon (FFXIV Data Explorer) for the first documenting the file formats
  • binrw team for an awesome Rust library!
  • sha1-smol for a dependency-free SHA1 implementation

And everyone else who writes FFXIV tools!