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Compression (Developers)

posted by Rugxulo Homepage, Usono, 16.04.2008, 01:13
(edited by Rugxulo on 16.04.2008, 01:25)

> You don't understand. If you want this, than make sure that this "in
> theory it should work" really works, and then submit it to FPC. Open
> source works through own responsibility.
The way you describe it sounds like it's impossible to do anything! And certainly we're only talking hypothetical here, you don't have to do any of this.

> - verify that the zip unpackers used (including several built-ins) can
> actually decompress the p7ziped zips. Maybe not all methods are supported.
7-Zip usually compresses .ZIPs using "Deflate" (i.e. PKZIP 2.x), which is method 8. There's also Deflate64 (which Info-Zip UNZIP 5.5x supports) and Bzip2 (which neither PKZIP/DOS nor Info-Zip currently support ... yet). You have to explicitly tell it to use something other than standard "Deflate" if you want something else. But yes, p7zip .ZIP output is 100% compatible with other tools.

> (I'm sure that one had problems with stream zipped ones).
I'm confused here: "stream zipped" as in "data descriptor" or multi-volume? The former is rare (but used in Java .JAR files) and the latter is unavailable in current Info-Zip tools (though being heavily worked on for the next major release).

PKWARE's APPNOTE 6.3.2 (September 28, 2007)

> - verify that p7zip works in the build process of said releases, including
> possible difficult scenario's (network, lfn on all windows and several dos
> versions) are tested, with the appropriate fixes to the buildsystem etc.
The p7zip compile by DJGPP works fine in DOS and Windows (though I think it's semi-incomplete as some things weren't truly ported, only assumed to work due to no compiler errors: -w requires LFN, and on rare occasion I've had to use "/dev/c/mydir" instead of "c:\mydir" because it didn't accept it (not sure if that's because it got confused by something like C:\ZIP or not).

Also, no idea if it works on network drives, but it does work on all DOSes (with or w/o DOSLFN) and Windows by default (although Win NT needs the NTLFN TSR).

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