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- Newsgroups: comp.compression
- Path: sparky!uunet!utcsri!torn!newshost.uwo.ca!obelix.gaul.csd.uwo.ca!gage
- From: gage@obelix.gaul.csd.uwo.ca (Darren Gage)
- Subject: HELP: Problem with old zipped files
- Reply-To: gage@obelix.gaul.csd.uwo.ca (Darren Gage)
- Organization: The Univesity of Western Ontario, London, Ontario, Canada
- Date: Sun, 20 Dec 1992 22:37:14 GMT
- Message-ID: <1992Dec20.223714.576@julian.uwo.ca>
- Keywords: zip
- Sender: news@julian.uwo.ca (USENET News System)
- Nntp-Posting-Host: obelix.gaul.csd.uwo.ca
- Lines: 59
-
-
- I have had a most interesting thing occur to me. Many
- moons ago, I compressed much of my personal work with ZIP 1.0
- on a unix machine. I was leaving that educational facility,
- and wished to retain my data files. I am recently unable to
- unzip them. They have sat in a box of 1.44 floppies for
- a year, so nothing has happened to them since I compressed.
- them. I, at the time would have tested whether I was able to
- unzip them so they should have been fine. I likely also
- unzipped them on my PC at home, and possibly rezipped them.
-
- As I re-enter the educational world, I thought about
- getting out my old material. I am shocked that I am as of yet
- unable to!. I've tried up-loading onto a unix, and unzipping
- with my old utilities, but this has failed. I've tried unzipping
- with every version of pkzip/unzip I could dig up, but still no
- success. Is it possible that I used some hacked version, that is
- not compatible with others? I thought about problems if the
- transfer was not in binary mode (when I down-loaded) but there
- too many high order bits set in the zipped files to allow for
- that. One other possibility, is that a virus altered the zip
- program such that it added bits of data into the zip file.
-
- Regardless, I am given this message with * unzip 5.0:
- * (this program was used as it offered the most information
- as to why it was unable to unzip)
-
- warning: extra 766 bytes at beginning or within zipfile
- (attempting to process anyway)
-
- error: start of central directory not found; zipfile corrupt.
- (please check that you have transferred or created the zipfile in the
- appropriate BINARY mode and that you have compiled unzip properly)
-
- I have viewed the zipped files with a hex editor, and
- it appears that the data is in fact there, but extra bits
- appear here and there. For instance, when ever the "version
- made by" bytes, and the "version needed to uncompress" bytes
- are output into the stream, a '0D' is placed before them. I
- have attempted to remove them, but this is not enough. The rest
- of the signature parts are fine, except for possibly the file
- sizes, and other data addressing values. They may be correct,
- but I cannot tell without knowing if the data is correct.
- BTW: the "version made by" bytes indicate that the files were
- made with zip 1.0 on a *nix [0A 03].
-
- I am hopping that someone may know the reason this has
- happened, and even better, can suggest a method to retrieve my
- files.
-
- Thanx in advance,
-
-
- Darren.
-
- gage@obelix.gaul.csd.uwo.ca
-
-
- no sig. [Sorry, I don't smoke ;^) ]
-