[delphizip] Span volume problems
- From: "Russell Peters" <russellpeters@xxxxxxxxxxx>
- To: <delphizip@xxxxxxxxxxxxx>
- Date: Fri, 6 Dec 2002 07:56:33 +1100
I am trying to get around volume name problems but it is rather involved
(you have to be able read them back readily)
I thought to check in following sequence
if not filename###.zip (## is number) assume must be last disk (error unless
Volume name is normal span volume name).
if filename###.zip must be part of span set (CheckForLastDisk(EOC,false)
returns false)
if filename.z## must be part of span set (CheckForLastDisk(EOC,false)
returns false).
Then use new add options AddSpanNoVolumeNames and AddSpanCompat to control
generating the zipfiles. AddSpanNoVolumeNames would make it generate
numbered files instead of numbered volume names and AddSpanCompat would make
it generate WinZip type names.
(Personally I would prefer filename.zip.nnn )
Thinking of template using brackets thus - filename[,nnn].zip or
filename.z[ip,nn] or filename.zip[,.nnn] where [ final , parts ].
Russell Peters
http://www.users.bigpond.com/russellpeters/delphizip.html
----- Original Message -----
From: "Alistair George" <bigal@xxxxxxxxxx>
To: "Roger Aelbrecht" <delphizip@xxxxxxxxxxxxx>
Sent: Friday, December 06, 2002 7:18 AM
Subject: [delphizip] Previous spanned reported spanned error
>
> Hello Roger,
>
> Just figured out what is wrong. I made the spanned set on hard disk, then
copied
> the spanned volumes to CDR (this means the Volume name is wrong, or non
existent :-(
> What I have been doing is to write volume sequence number on the disks. Is
there
> an easy way around this (can you suggest what is needed to make zipmaster
accept
> unnamed volumes) as it is preferable to write CDROM directly off the file
> on Hard Disk for obvious reasons.
> Cheers,
> Alistair+
>
> Friday, December 6, 2002, 6:48:14 AM, you wrote:
>
> RA> ----- Original Message -----
> RA> From: "Alistair George" <bigal@xxxxxxxxxx>
> RA> To: "Roger Aelbrecht" <delphizip@xxxxxxxxxxxxx>
> RA> Sent: Wednesday, December 04, 2002 7:33 PM
> RA> Subject: [delphizip] Re: Maxdisksize FreeSize
>
>
> >>
> >> Hello Roger,
> >>
> >> >> A major weakness of the current ZIP format is its slowness in
returning
> RA> a
> >> RA> file
> >> >> within a spanned archive. Usually I make CDRW archives in segments,
so
> >> RA> that retrieval
> >> >> is within the same disk.
> >>
> >> RA> To be honest I think this was the way it was originlly inteded to
be.
> >> RA> The whole issue of wrting to CD and CDRW came up long after the
PKZIP
> >> RA> format was defined.
> >>
> >> RA> Personnly I still don't understand why the Central Directory has to
be
> RA> at
> >> RA> the end
> >> RA> (or last disk) in fornt or onthe first disk would make things much
> RA> easier.
> >> RA> But then again we are restarting the discussion of a new format.;-)
> >>
> >> Would having a central directory on each disk stuff up multi-disk
backward
> >> compatibility?
>
> RA> I cannot answer that without going the procedures and maybe do some
testing
> RA> But as it is written today, the central directory needs to be one and
> RA> complete
> RA> So putting it on each disk will not always guarantee that you have the
right
> RA> disk
> RA> in the reader, and then we end with the same problem
>
>
> RA> This is a major problem with disk spanning if you have several
> >> CDRW with data it takes forever to restore a single file but if you
have
> RA> each
> >> disk 'just filled' and do several separate archives the restore
function
> RA> is very
> >> fast.
> >>
>
>
>
> >> Anyway, having the ability to write fixed size to various disks if you
> RA> could
> >> impliment it without too much ado would be appreciated by me - if
anyone
> RA> is
> >> against it please put your pennyworth in thanks.
> >> Alistair+
> >>
>
>
> RA> Roger Aelbrecht
> RA> http://web.wanadoo.be/driehoeksw
>
>
>
>
>
> --
> Regards,
> Alistair+
>
>
>
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