How to manualy deserialize .mca files?

[jotalanusse]

I would like to know if it is possible to manually deserialize .mca files, similar to what is done with the level.dat in these examples:

nbt-dump.rs simple-deserialize.rs

I know that level.dat files are compressed with Gzip, and .mca files with Zlib, but I don't know how I should approach the parsing process.

Any help is greatly appreciated!

[owengage]

Hi, you should check out the Region struct in fastanvil. That will let you extract chunks, which you can then read as NBT.

On Fri, 19 Jan 2024, 8:23 pm Jota Lanusse, @.***> wrote:

I would like to know if it is possible to manually deserialize .mca files, similar to what is done with the level.dat in these examples:

nbt-dump.rs https://github.com/owengage/fastnbt/blob/master/fastnbt/examples/nbt-dump.rs simple-deserialize.rs https://github.com/owengage/fastnbt/blob/master/fastnbt/examples/simple-deserialize.rs

I know that level.dat files are compressed with Gzip, and .mca files with Zlib, but I don't know how I should approach the parsing process.

Any help is greatly appreciated!

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[jotalanusse]

There is a function region.read_chunk() that returns a Vec<u8>. Is this the raw NBT data?

[owengage]

Yes it is, uncompressed. You can see the docs here: https://docs.rs/fastanvil/latest/fastanvil/struct.Region.html#method.read_chunk