These are typically named z01, z02, etc., and the. (Note that multi-part ZIPs are now often created as Zip64 for large-file reasons ( verify)) Maximum supported/allowed file size (e.g. Maximum size of a medium, in particular floppies but also CDs, Multipart zip files were once used to get over the Multi-part ZIP This article/section is a stub - probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. 7: "Reserved for Tokenizing compression algorithm" (?).12: bzip2 (since WinZip version 11 ( verify)).98: PPMd (since WinZip version 11 ( verify)).8: Deflate (the one that everything supports).General purpose, little point because basic deflate is usually better: To avoid compatibility problems, ZIP files created for compatibility are based on DEFLATE, so has basically not changed in twenty years. This also means not everything can open every zip file. Of the compression formats, some are outdated, many are specialized, and there is optional encryption. There have been a bunch of revisions/additions (see version history), and the amount of underlying compression formats has increased over time. There was some compatibility kerfuffle about encryption at the time). (Feel free to ignore, or tell me)Ĭommonly used, mostly because it caught on is so well in the mid-nineties it became a generic brand name.Ĭreated by PKWare, as PKZIP, though many will know the WinZip product (not from PKWare. Utilities and file formats (rather than methods and algorithms) This article/section is a stub - probably a pile of half-sorted notes, is not well-checked so may have incorrect bits. 2.9.3 High speed, reasonable compression.2.9.2 On CPU and memory difference under higher compression.2.9.1 High compression, who-cares-about-speed.2.8.2 Prediction by Partial Matching (PPM). 2.1 Entropy coding (minimum redundancy coding).1.1.14 Parallelized variants, and speed versus compression.1 Utilities and file formats (rather than methods and algorithms).
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