Unzip error thrown when big file as compression type 9 about fflate HOT 1 CLOSED

fflate does not support type 9 compression; the README's verbiage is admittedly a bit confusing here.

You can even use custom compression/decompression algorithms from other libraries, as long as they are defined in the ZIP spec (see section 4.4.5)

This is meant to say that you can register a decompressor for a format specified in 4.4.5 if you implement it or bring it in from a different library, not that fflate has support for those decompressors by default.

If you need to support compression type 9, you will likely need to implement it yourself, as it's a relatively uncommon format. This should be relatively doable given that compression type 9 (Deflate64) is almost the same as DEFLATE but with some extra bit lengths; you could probably use fflate's inflt function as a baseline.

from fflate.