minosoft/doc/Assets.md

Minecraft Assets

Assets are Game Files. For example:

• Textures
• Sounds
• Language Files
• (Icons)
• (Block models)
• ...

There are core assets (essential for the game), delivered in the client.jar (Textures, en_US language, models, etc) and there are "other assets", like sounds, all other languages, available on https://resources.download.minecraft.net/.

Minosoft downloads the current best available (hardcoded) client.jar and extracts the minecraft folder in it into a temporary one. Now the (sha1) hash is getting calculated and then the file will be gzipped and saved into %Dir%/assets/objects/<first 2 digs of hash>/<full hash>.gz. Next, a file called index.json will be created. It is a simple mapping: file name -> hash and looks like this:

{
 "minecraft/lang/de_de.json": "a8f1b2babf63e3fa21d24728271eaef0d8d33041"
}

Next, in the version.json (Example 1.16.4-pre1) there is a sub json object called assetIndex. The asset index will be downloaded and stored. The hash of the file is hardcoded into minosoft to ensure that the assets are compatible. Next we loop over all elements and check if the file exists. If not, we will download it and store it gzip compressed.

Valid (Relevant) files

Before downloading a file, the file is checked for relevance. Relevant files are prefixed with the following strings (or the file path):

• minecraft/lang/ -> Language files
• minecraft/sounds/ -> Sounds
• minecraft/textures/ -> Textures
• minecraft/font/ -> Fonts

Modifications

If you want to edit an existing file, you should disable verify-all-assets (in debug), otherwise your changes will be recognised as corruption and will be overwritten.