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Author Topic: Question about UPK compression  (Read 108 times)
hydle
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Question about UPK compression
« on: August 05, 2023, 00:02 »

I'm currently trying to create my own UPK decompressor for a game that isn't supported. I believe the UPK files use lzo1x compression but I am trying to figure out which parts of the file use this and if I can just decompress the entire things or if I need to do specific parts individually. The header of the files seem to be unchanged from compressed to decompressed so I assume that I leave untouched. If there are any other compression types that UPK files use that I am unaware of I would appreciate any knowledge or help. Thanks
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spiritovod
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Re: Question about UPK compression
« Reply #1 on: August 05, 2023, 15:45 »

@hydle: You can take a look at source code of Gildor's decompressor here: https://github.com/gildor2/UEViewer/tree/master/Tools/PackageUnpack. Aside from assets' content, upk contains assets, each of them is header summary + compressed chunks. Though it's probably better to look at some more complex solutions such as UPKManager, UPKUtils and such, because they're usually customized for games with modified formats as well.
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