[delphizip] Re: Fragmented archives : Naming conventions
- From: "Russell Peters" <russellpeters@xxxxxxxxxxx>
- To: <delphizip@xxxxxxxxxxxxx>
- Date: Wed, 4 Dec 2002 15:49:35 +1100
Will have a look and see what I can come up with (been making a couple of
changes to ZipDll)
Russell Peters
http://www.users.bigpond.com/russellpeters/delphizip.html
----- Original Message -----
From: "James Turner" <james.d.h.turner@xxxxxxxxxxxx>
To: <delphizip@xxxxxxxxxxxxx>
Sent: Wednesday, December 04, 2002 7:34 AM
Subject: [delphizip] Fragmented archives : Naming conventions
> Rather than rigidly defining two or three sequential naming conventions or
implementing an event handler, would it not make sense to simply define a
name template such as MyArc??.zip or Archive.z?? or ZipArc.??? or
Archive.zip (no numeric component). For each archive fragment, simply change
the digits sequentially.
>
> This does leave the issue of whether to detect the template prior to
assembly or require such information to be supplied and it also leaves the
question of the final filename which may need to be treated as a special
case.
>
> e.g.
> function WriteSpan(const SourceZip,DestDir,NameTemplate:string const
FinalName:string = ''):BOOL;
> function ReadSpan(const DestZip,SourceDir,NameTemplate:string; const
FinalName:string = ''):BOOL;
>
> When reading :-
> If the template contains no ? chars (and no digits) then prompting for a
change of disk would be required.
> If NameTemplate simply contained something like Archive001.zip, ideally,
it should be able to calculate the correct template, in this case
Archive???.zip. Provided that the notional filename does not contain digits,
this is easy. If it does contain digits, then the problem is a little more
interesting. However, I think scanning backwards would work well. By this, I
mean look at the extension, if it contains digits then replace them with ?
chars to create the template. If not then if the final char of the name is a
digit, then replace these digits with ? chars.
>
> Since program filenames often contain version information in the final 2
digits of the name, there is a problem. Assembling an archive named
xxxxxx20.zip fragmented as xxxxxx2001.zip, xxxxxx2002.zip, etc could not be
done by automatic detection. Such an archive would have to be fragmented as
xxxxxx20.z01, xxxxxx20.z02, etc. in order that it could be correctly
assembled (without getting into complex strategies). This maybe why WinZip
uses this naming strategy (according to earlier comments).
>
> It's all good fun - not !!!
>
> -- James Turner
> www.skaro.net
>
>
>
>
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