add BZip2 support in 7z/pk7

landfill baby · Post by **landfill baby** » Thu May 24, 2018 1:55 pm

self-explanatory.

Post by **Graf Zahl** » Thu May 24, 2018 2:10 pm

LZMA is already at 18.05.

landfill baby · Post by **landfill baby** » Thu May 24, 2018 3:35 pm

yeah, oops, i was mistaken there, but i just checked with the latest dev build (b612e182b) and it still gives the error "unsupported 7z/LZMA file!" with a bzip2ed pk7

Post by **_mental_** » Fri May 25, 2018 1:08 am

BZip2 is not supported by LZMA library, it's implemented in 7-zip executable only.
For this reason GZDoom cannot handle such .7z files.

The question is why do you need BZip2 compression in pk7?
LZMA provides better compression ratio and difference in decompression speed isn't noticeable in most cases (as long as solid archives are not used).

landfill baby · Post by **landfill baby** » Fri May 25, 2018 2:01 am

i've found that with a certain set of (very repetitive) files, bzip2 outperforms lzma by almost twofold when making a solid archive. i guess if i really have to, i could put all of the files into a wad and then bzip2 it via a zip.

Post by **Gez** » Fri May 25, 2018 2:20 am

Solid archives are good for storage and transfer, but bad for use as a game data format, because it means the engine has to uncompress the entire file to access any lump in it.

ZDoom