[Info-vax] INIT/HIGHWATER

[Phillip Helbig---undress to reply]

In article
<1973911f-ea8f-4a73-ad2d-c11bad500c64 at q36g2000yqn.googlegroups.com>,
Jose Baars <peutbaars at googlemail.com> writes: 

> On 7 feb, 20:02, moro... at world.std.spaamtrap.com (Michael Moroney)
> wrote:
> > Highwater usually stays out of the way, most applications have no need
> > to try to read beyond the logical end of data and thus the highwater,
> > but when one does the read is intercepted to return "read" data of
> > all zeroes.
> 
> Making a zipfile with the "-V" option, and then trying to read it on
> Windows
> will reveal such disk data under some circumstances ( cluster size,
> bad (ASCII FTP) transfers, never cared to precisely define them all)
> when this zipfile has been made on a non-HIGHWATER marked disk.
> 
> Quite embarrassing to get a question what this COBOL code is doing
> in a zipfile. I'm not sure if this is still the case with more modern
> versions
> of zip.

Actually, IIRC (I'm sure SMS will CMIIAR), this is a new feature to ZIP 
and is intended for VMS --> VMS transfer to give maximum fidelity.