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i have never used reverse engineering techniques on LOLZ and even then Tarz is written in Delphi, from what i think lolz must be either C or CPP.
However i have used reverse logic on the tool. i basically recreated the tool by individually compressing smaller inputs and comparing them to their original counterparts.
This along with modelling logic i have from several other projects allowed for the creation of Tarz, which uses RANS as backend and not ROLZ.
All the ratio comes from Models, and their prediction, i have also developed other tools, foxlz and veloz. Native to my archiver and maybe i will bring them to FA.
Decode Speeds as you have asked. Here a picture.
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My projects : Masked Compression, lzma2(xz) on Freearc, Zstd compressor for windows
My optimizations : packjpg.exe, zstd, lzham, precomp-dev-0.45.
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