Help! 2.04 Zip file 11 gig! I cannot extract it all!

[Tom]

I need to extract an 11 gig zip file made with an older version of PKZIP.
We have been able to get the first 4 gigs but nothing beyond that. Are
there any tools or utilities that will scan the zip file and actually
extract the data? I have tried a couple that claim to recover corrupted
zips, but they only get the first 2 or 4 gb.

The data is a full offline backup and I need it ASAP!

Tom

[Joe]

Tom <nospam_...@bellsouth.net> wrote in message
news:mrf%a.1325$Q_....@fe03.atl2.webusenet.com...

The problem (probaly) isn't the the ZIP. It's your OS. You need to try it
on a partition without the 4GB filesize limit (+/-2^31 [signed] or 2^32).
Pray you have access to NTFS on your OS. ):
It's worth a shot, to look for a 64 bit based one. This is more common for
people editing video, or disk images. Goodluck.

[Tom]

The zip file was created on Win2K server in NTFS and we have been trying to
extract it on NTFS. So far, we haven't found a utility that will extract
it. The reason that it is so important is that it is an Oracle database
backup, and we cannot extract any backups from our earlier tape backups.

--Tom

"Joe" <ye...@right.com> wrote in message
news:OQk%a.3004$kK4....@nwrddc02.gnilink.net...

[Rainer Nausedat]

In article <Q4q%a.9025$f44...@fe04.atl2.webusenet.com>,
nospam_...@bellsouth.net says...

> The zip file was created on Win2K server in NTFS and we have been trying to
> extract it on NTFS. So far, we haven't found a utility that will extract
> it. The reason that it is so important is that it is an Oracle database
> backup, and we cannot extract any backups from our earlier tape backups.

Tom, is the zip archive by chance a zip64 archive? If so you might
want to try Squeez or ZipStar from www.squeez.com. Both are
supporting large zip archives.

R.Nausedat

[Marco Schmidt]

Tom:

>The zip file was created on Win2K server in NTFS and we have been trying to
>extract it on NTFS. So far, we haven't found a utility that will extract
>it. The reason that it is so important is that it is an Oracle database
>backup, and we cannot extract any backups from our earlier tape backups.

The ZIP format until recently was restricted to 32 bit offset values
allowing for only up to 4 GB being addressed. If you used an older
version of PKZip, it may have written anything into the offset values
for files stored beyond the 4 GB barrier.

You may be successful unpacking with an unzip program that does not
use the offset information from the end of the ZIP archive but instead
reads sequentially from beginning to end taking into consideration
only local headers.

What other ZIP programs have you tried? There are quite a few:
<http://directory.google.com/Top/Computers/Software/Data_Compression/>.
Maybe a command line unzip program from
<http://www.info-zip.org/pub/infozip/UnZip.html> does the job. But I
guess those all use the offset values rendered useless by their
limitation to 32 bits. :/

I know that the Java API contains unzip code that simply reads
sequentially without ever dealing with offsets. If you did not use
encryption, that may work for you. A simple unzip program seems to be
at <http://www.wakhok.ac.jp/~tatsuo/sen97/10shuu/UnZip.java.html>.
Should compile with Java 1.1+. A simple

java UnZip yourarchive.zip

at the command prompt should then decompress the archive.

Regards,
Marco

[Marco Schmidt]

Rainer Nausedat:

>Tom, is the zip archive by chance a zip64 archive? If so you might
>want to try Squeez or ZipStar from www.squeez.com. Both are
>supporting large zip archives.

Not likely, he said "an older version of PKZip". I don't think the 64
bit extension to the format is that old.

Regards,
Marco

[Ojala Pasi 'Albert']

In article <Q4q%a.9025$f44...@fe04.atl2.webusenet.com>,

Tom <nospam_...@bellsouth.net> wrote:
>The zip file was created on Win2K server in NTFS and we have been trying to
>extract it on NTFS. So far, we haven't found a utility that will extract
>it. The reason that it is so important is that it is an Oracle database
>backup, and we cannot extract any backups from our earlier tape backups.

You could try to extract it with
http://www.cs.tut.fi/~albert/Dev/gunzip/gunzip.c (compile first).
This decompressor does not bother with the central directory or fseek()
and thus might be able to extract everything. Let me know of your results.

-Pasi
--
"She's Minbari. You know, sometimes, I look at her and I know exactly
what she's thinking. Sometimes, .. she's a mystery to me."
-- Sheridan to Franklin in Babylon 5:"Sleeping in Light"

[Tom]

We ended up creating an extractor (using Delphi) that parses the zip file
and extracts each compressed file, then to uncompress each resultant
sub-file we used the new version of PKZip for Windows.

So, we finally got the information out and the database has been restored.

If anyone else has this problem, we now have a utility available that will
correctly extract/fix the archive. Contact me at tniderost at hotmail dot
com

--Tom

"Ojala Pasi 'Albert'" <alb...@pikkukorppi.cs.tut.fi> wrote in message
news:bhq5l5$egm$1...@news.cc.tut.fi...