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pkbugs
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1996-04-21
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Known, current PKZIP bugs/limitations:
-------------------------------------
- PKUNZIP 2.04g considers volume labels valid only if originated on a FAT
file system, but other OSes and file systems (e.g., Amiga and OS/2 HPFS)
support volume labels, too
- PKUNZIP 2.04g can restore volume labels created by Zip 2.x but not by
PKZIP 2.04g (OS/2 DOS box only??)
- PKUNZIP 2.04g gives an error message for stored directory entries created
under other OSes (although it creates the directory anyway), and PKZIP -vt
does not report the directory attribute bit as being set, even if it is
- PKZIP 2.04g mangles unknown extra fields (especially OS/2 extended attri-
butes) when adding new files to an existing zipfile [example: Walnut Creek
Hobbes March 1995 CD-ROM, FILE_ID.DIZ additions]
- PKUNZIP 2.04g is unable to detect or deal with prepended junk in a zipfile,
reporting CRC errors in valid compressed data.
- [Windows version 2.01] Win95 long filenames (VFAT) are stored OK, but the
file system is listed as ordinary DOS FAT
Possibly current PKZIP bugs:
---------------------------
- PKZIP (2.04g?) can silently ignore read errors on network drives, storing
the correct CRC and compressed length but an incorrect and inconsistent
uncompressed length
- PKZIP (2.04g?), when deleting files from within a zipfile on a Novell
drive, sometimes only zeros out the data while failing to shrink the
zipfile.
Other limitations:
-----------------
- PKZIP 1.x and 2.x encryption has been cracked (known-plaintext approach)
[many other bugs in versions 1.0, 1.1, 1.93a, 2.04c and 2.04e]