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- Path: sparky!uunet!dtix!darwin.sura.net!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!ucbvax!ACAD.DRAKE.EDU!SK0001
- From: SK0001@ACAD.DRAKE.EDU (Sal Kabalani)
- Newsgroups: comp.os.vms
- Subject: The Scoop on VMS ZIP and UNZIP
- Message-ID: <01GOEFXYSITU0012CL@ACAD.DRAKE.EDU>
- Date: 5 Sep 92 02:46:59 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Organization: The Internet
- Lines: 86
-
- Hello All.
-
- Someone sent the following message to info-vax and didn't leave a return
- address, so I am posting the response to INFO-VAX.
-
- >I am using a version of PK-ZIP/UNZIP for VAX/VMS, a public domain or
- >shareware file compression program. This is version
- >4.1, I believe, and it contains a bug (?) in which all de-compressed files
- >have the Stream_LF Record format.
- >
- >Does anyone know if there is a new version
- >available (and from where?) in which this
- >bug has been fixed?
- >
- >Many thanks!
-
- Text file transfer between DOS and VMS machines is a vital part of our
- day-to-day operation, so I have been following this topic with great interest.
- Here are the results of my research:
-
- Using the new VAX ZIP/UNZIP, in conjunction with the new PKZIP version 1.93
- Alpha, I was able to transfer files between MS-DOS and VMS successfully, and
- reproduce them accurately on the target machine.
-
- The software I used in my tests are: ZIP V 1.9, 20-Aug-1992; UNZIP V 5.0,
- 21-Aug-1992; and the ALPHA test version of PKZIP 1.93.
-
- The only problem at this point is that the version of PKZIP I used is only an
- ALPHA test version. It is NOT a production version. You will need to wait
- until PKWARE releases PKZIP 2.0. This will be around October or November of
- this year. (PKWARE tech support was not able to give me exact release time.)
- As a personal opinion, I think all of us who use PKZIP should pay the shareware
- fee to support such an brilliant product. I also would like to salute all those
- who worked hard to make portable ZIP such a great product. Thanks guys :)
-
- The new ZIP/UNZIP uses a new method of compression called Inflate (and its
- counterpart Deflate). This seems to be the preferred method of compressing text
- files used by ZIP/UNZIP, and this is the reason why I needed to use the new
- PKZIP for my testing. Inflate is supported ONLY in PKZIP 1.93 Alpha and PKZIP
- 2.0.
-
- It is important that you do not use the ALPHA version of PKZIP as a production
- version. I strongly recommend that you wait until 2.0 is released. A word
- of caution: There has been a few HACKED versions of PKZIP floating around
- bearing the version number 2.0. DO NOT USE THEM. They may render your data
- unusable. When PKWARE does release 2.0, I recommend that you call their BBS
- and download the software yourself.
-
- I have tested these programs with small files (under 15K) and with meduim-size
- files (225K VAX->MS-DOS, 140K MS-DOS->VAX). I assume the software will produce
- the same results with any-size files. (We have been using ZIP/PKZIP on files up
- to 20 MEG in size with no problems).
-
- Transferring ZIPped text files from VAX to MS-DOS, then PKUNZIPping them on DOS
- will reproduce the file accurately, including <CR> <LF> characters.
- Transferring PKZIPped text files from MS-DOS to VAX, then UNZIPping them on VMS
- will reproduce the file accurately in a Sequential Variable Record Size
- format. As far as my needs go, this is MUCH better that the old STREAM_LF
- format.
-
- I am listing prameter settings to successfully exchange ZIP files between VAX
- and MS-DOS.
-
- Kermit File Type
- ----Transfer---
- From To ZIP Flags MS-DOS VAX UNZIP Flags
- ______ ______ _________ ______ _____ ___________
-
- VAX MS-DOS -l -k -V Binary Fixed None
- MS-DOS VAX None Binary Fixed -a
-
- I have not tested the file transfer with Zmodem, or any other protocol, but I
- think the results will be the same. Also I have not tested the transfer of
- Binary file transfer. I have no need to. If anyone discoveres a problem
- transferring binary files, I would appreciate it if they let us know.
-
- Hope this helps. If anyone thinks I have arrived at the wrong test results or
- conclusions, please feel free to correct me.
-
- .-Sal A Kabalani----------+--Internet: SK0001 @ Acad.Drake.Edu----------------.
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