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000346_news@columbia.edu_Wed Jul 12 06:06:51 1995.msg
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Received: from apakabar.cc.columbia.edu by watsun.cc.columbia.edu with SMTP id AA11696
(5.65c+CU/IDA-1.4.4/HLK for <kermit.misc@watsun.cc.columbia.edu>); Thu, 13 Jul 1995 03:18:42 -0400
Received: by apakabar.cc.columbia.edu id AA21086
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Path: news.columbia.edu!panix!news.mathworks.com!gatech!howland.reston.ans.net!news.cac.psu.edu!psuvm!hdk
Organization: Penn State University
Date: Wed, 12 Jul 1995 10:06:51 EDT
From: H. D. Knoble <HDK@psuvm.psu.edu>
Message-Id: <95193.100651HDK@psuvm.psu.edu>
Newsgroups: comp.protocols.kermit.misc
Subject: Re: Binary files in Kerm CMS 4.3
References: <3tulne$j02@cronkite.ocis.temple.edu>
Lines: 16
Apparently-To: kermit.misc@watsun.cc.columbia.edu
V-binary and D-binary(decimal binary) do the same thing, namely
allow CMS dependent varying length records ("undefined" length
variable length records - e.g., * MODULE files) to be
downloaded to DOS and later uploaded and recovered exactly. The
actual CMS lrecls are written in the front of each record. For d-binary
you can even edit the DOS file and "see" these record lengths.
This recording of actual LRECL is necessary (for MODULEs for example)
because these CMS files ARE varying length, but do not have block and
segment control fields are part of the record like RECFM=V varying length
data files do. That is, these are really RECFM=U (Undefined) records.
Kermit-CMS reads such undefined length records from a CMS file and
temporarily creates a length field in binary (v-binary) or decimal(d-binary)
and prepends this to the records on download and strips it on upload while
simultaneously re-writing undefined length records back to CMS exactly
as they existed at download time. Neat isn't it:-) Thanks to Columbia U.
and John Chandler, (co)author of Kermit-CMS.