FEZRepacker

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Tool and library for unpacking and repacking FEZ assets

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# FEZ Repacker

## Overview

**FEZ Repacker** is a tool created for unpacking and packing FEZ's `.pak` asset packages. It allows two-way conversion of game assets into easily modifiable file formats, which makes modding of FEZ more accessible.

## Assets conversion description

![Flowchart showing conversion process](https://raw.githubusercontent.com/FEZModding/FEZRepacker/main/Docs/diagram.png)

FEZ stores its game assets in four `.pak` package files: `Essentials.pak`, `Music.pak`, `Other.pak` and `Updates.pak`. These packages can contain three different file types:

- **Ogg** - digital multimedia container. Stores music.
- **Effect files** - `FXC` effect files containing compiled XNA effect shaders.
- **XNB** - Microsoft XNA Game Studio 4.0 compiled content containers. Stores textures, sound effects, triles, levels, scripts and other miscellaneous data.

In addition to directly unpacking Ogg and effect files, Repacker is capable of converting specific XNB assets types into other intermediate formats and vice-versa, allowing much easier data manipulation.

Here's a list of all 13 asset types handled by FEZ and file types Repacker converts them to:

You can read about conversion formats in detail [here](https://fezmodding.github.io/wiki/content/content_conversion).

If you want to learn more about the technical process of reading PAK packages and XNB files, read [this page on the wiki.](https://fezmodding.github.io/wiki/game/content_formats).

## Usage

As of right now, FEZ Repacker is a command line tool. In order to see a list of available commands, use `FEZRepacker.exe --help`. Launching executable with no parameters will start an interactive mode.

To make the usage of the tool easier, you can put it within `Content` directory of your FEZ installation.

Here's a list of currently defined commands:

- `[--unpack, -u] [pak-path] [destination-folder]`
Unpacks entire .PAK package into specified directory (creates one if doesn't exist) and attempts to convert XNB assets into their corresponding format in the process.

- `--unpack-raw [pak-path] [destination-folder]`
Unpacks entire .PAK package into specified directory (creates one if doesn't exist) leaving XNB assets in their original form.

- `--unpack-decompressed [pak-path] [destination-folder]`
Unpacks entire .PAK package into specified directory (creates one if doesn't exist).and attempts to decompress all XNB assets, but does not convert them.

- `[--unpack-fez-content, -g] [fez-content-directory] [destination-folder]`
Unpacks and converts all game assets into specified directory (creates one if doesn't exist).

- `[--pack, -p] [input-directory-path] [destination-pak-path] <include-pak-path>`
Loads files from given input directory path, tries to deconvert them and pack into a destination .PAK file with given path. If include .PAK path is provided, it'll add its content into the new .PAK package.

- `[--list, -l] [pak-path]`
Lists all files contained withing given .PAK package.

- `[--convert-from-xnb, -x] [xnb-input] [file-output]`
Attempts to convert given XNB input (this can be a path to a single asset or an entire directory) and save it at given output (if input is a directory, converts all files within it recursively and dumps all converted files in specified path).

- `[--convert-to-xnb, -X] [file-input] [xnb-output]`
Attempts to convert given input (this can be a path to a single file or an entire directory) into XNB file(s) and save it at given output (if input is a directory, converts all files within it recursively and dumps all converted files in specified path).

Commands that convert XNB assets can take optional conversion flags:

- `--use-trixel-art-bundle` - converts trixel art based assets (ArtObjects and TrileSets) into a bundle of JSON, OBJ and PNG files instead of encoding it into binary glTF file.
- `--use-animation-sheets` - converts AnimatedTextures into a `.fezanim.*` bundle of JSON and PNG atlas texture instead of encoding it in GIF, ensuring round-trip conversion of that asset.

## Examples

Here are some examples how you can use these commands:

- To unpack every game asset from the game into `Unpacked` directory (assuming your working directory is `Content`), use:
`FEZRepacker.exe --unpack-fez-content . Unpacked`
- To unpack `Other.pak` into a directory called `Other unpacked`, use:
`FEZRepacker.exe --unpack Other.pak "Other unpacked"`
- To repack files contained in `Other unpacked` directory into a package named `Other.pak` while also including the contents of `Other_old.pak`, use:
`FEZRepacker.exe --pack "Other unpacked" Other.pak Other_old.pak`
- To convert all file bundles located in the `files_in` directory into XNB assets, and then store them in `files_out` directory, use:
`FEZRepacker.exe --convert-to-xnb files_in files_out`

## Game modding remarks

It is recommended to use mod loader like [HAT](https://github.com/FEZModding/HAT) to swap original assets, but if you're trying to do it manually by recompiling them into one of the archives and your changes didn't affect the game, here's a couple of things to keep in mind:

- directory tree created in unpacking process **does matter** - putting modified files in the main directory after changing them doesn't give them their original location and name in PAK file after repacking, preventing the game from finding the new asset.
- Packages are loaded in this order: `Essentials.pak`, `Updates.pak` and `Other.pak`. If you're trying to override an existing file, it has to be in the same package or in a package that's loaded sooner.
- Music is handled separately and has to be packed in `Music.pak`.

## Building

Most of the work with building is handled by MSBuild.

The solution is separated into two projects: `Core` and `Interface`.

`Core` contains nearly all the logic, and is meant to be a stand-alone binary that can be used by other software (most notably, HAT mod loader).

`Interface` contains console line interface layer and can be used as a reference for interacting with `Core` library. It is distributed as a self-contained executable using the following command:
`dotnet publish -c Release -r win-x86 --self-contained`

## Credits

This project uses:

* [ImageSharp](https://github.com/SixLabors/ImageSharp) for image-based assets in the conversion step.
* [SharpGTLF](https://github.com/vpenades/SharpGLTF) for 3D-based assets in the conversion step.

## Sources

Sources used in a process of writing this tool and documentation:

- [.pak structure reverse-engineering by Mathias Panzenböck (panzi)](http://hackworthy.blogspot.com/2017/08/reverse-engineering-simple-game-archive.html)
- [Official XNB format documentation by Microsoft Corporation](https://docplayer.net/49383763-Microsoft-xna-game-studio-4-0-compiled-xnb-content-format.html)
- [XNB reader code from open source implementation of MonoGame](https://github.com/labnation/MonoGame/blob/d270be3e800a3955886e817cdd06133743a7e043/MonoGame.Framework/Content/ContentManager.cs#L405)
- [xnb_parse repository by fesh0r](https://github.com/fesh0r/xnb_parse/)
- My own decompilation of the latest FEZ release (as of 2022)

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