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98 lines
4.0 KiB
Plaintext
98 lines
4.0 KiB
Plaintext
Tandem Port History
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===================
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Hi, I'm Dave Smith and I work at BP Oil UK, looking after their European card
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processing system since 1992. We need to send lots of files via FTP to other
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BP machines (Novell, NT, Sun...). Sending large files was frowned upon, so the
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search for a zip product was on.
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We tried the GZIP product from Twinsoft Netherlands but it was complicated to
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use and it was not widely known by other arts of BP.
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What we really wanted was a PKZIP compatible product, as this is a widely known
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product. By chance when surfing the web I discovered the Info-ZIP web site.
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This claimed PKZIP 2.04g compatibility and had a number of ports, was free, and
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even had source code, but unfortunately no Tandem version :-(
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Thus in the autumn 1996 I bit the bullet and took on the job of porting the
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code to Tandem NSK (Guardian). This meant dusting off my circa 1985 'C'
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programming skills and firing up the Tandem 'C' compiler - not known for its
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ease of use, especially debugging 8-; This was all on D30 by the way.
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To start this off I had to choose an existing port to base te Tandem one on.
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Nearest (?) was the VM-CMS/MVS port by George Petrov. The main similarity
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being that these machines are record based, and have a similarish filing system
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to Guardian.
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First to be tackled was ZIP. By the end of 1996 I had a version which compiled
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and ran (giving the program banner) - which seemed like a major acheivement at
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the time.
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In December 1996 I forwarded a version of ZIP to Info-ZIP which wor
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ked only on Edit files, and had no concept of directories. Became ZIP 2.1
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By March 1997 I had improved ZIP so that it could cope with Unstructured files
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as well (Became ZIP 2.2). I also had ported a version of UNZIP which could
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create Unstructured files (not Edit) - UNZIP 5.20
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At the start of September 1997 I sent UNZIP with Edit file support to Info-ZIP
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(incorporated into 5.32)
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In March 1998 I submitted file I/O improvements (SBB) for ZIP (2.3a)
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In August 1998 I added Tandem DEFINE processing for ZIP (2.3e). This was a
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feature required by BP to allow them to store files with a different internal
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name than the physical file being zipped (without renaming it).
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Also added storing of proper UTC timestamps which allow for DST & timezone.
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Also in August I added the same file I/O improvements for UNZIP (5.33f)
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I then added the ability to update the unzipped files last modified and last
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open timestamps - this required help from TNSC to allow me access to the
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priviliged procedure call. Also can give the files back to the original user
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by use of the '-X' flag.
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At the end of 1998 I was given the go ahead to add the zipping of Enscribe
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files. This first version stores all Enscribe file attributes EXCEPT SQL, alt
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key and partition information.
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ZIP now uses its own Guardian I/O (rather than the 'C'library) for the reading
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of files to be zipped.
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Unstructured files use Large Transfer mode and READ (56K or 30K reads)
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Edit files use IOEdit routines
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Enscribe files use READ and SBB and add LF to the end of each record.
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UNZIP has the ability to update the filecode of files restored to ther original
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value (Unstructured only)
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To Do ZIP
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===========
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1. Change I/O to use NSK/Large Transfer mode in fwrite of ZIP file itself- this
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will dramaticaly speed up updating an existing zipfile. When updating an
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existing zipfile it copies it to a temporary file currently using only SBB.
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2. Add raw binary mode to allow storing of raw data in zip file - e.g. only to
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be unzipped on Tandem ! This is simplest/fastest way to provide full
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Enscribe support for Tandem platform - with no cross-platform support.
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3. Add SQL support !!
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To Do UNZIP
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===========
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1. Re-write the I/O routines to use NSK to recreate the original Enscribe file
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structure.
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2. Use NSK Large Transfer mode I/O for reading/writing of ZIP file
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3. Add raw binary mode to allow restoration of Tandem file from previous raw
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data ZIP (see above)
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4. Add SQL support !!
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Current Versions on Website
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===========================
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ZIP 2.3
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UNZIP 5.5
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As of February 17th 2002
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