[delphizip] New spanning scheme - allows SFX
- From: James Turner <james.d.h.turner@xxxxxxxxxxxx>
- To: delphizip@xxxxxxxxxxxxx
- Date: Wed, 8 Jan 2003 11:09:57 +0000
The format proposed below would be incompatible with standard methods to
assemble zip archives. In a spanned disk set, I can see no advantage, to
combining the zip reader code into the zip file. To me, this seems to be
unnecessary work producing a format that would not be compatible with existing
zip software.
As far as I can remember, Winzip uses a separate zip reader program with sfx
disk sets.
-- James Turner
>
> From: "Russell Peters" <russellpeters@xxxxxxxxxxx>
> Date: 2003/01/08 Wed AM 05:00:24 GMT
> To: <delphizip@xxxxxxxxxxxxx>
> Subject: [delphizip] New spanning scheme - allows SFX
>
>
> Proposal for new ZipSpan that can SFX
>
> The main file is the Central Directory or SFX + Central Directory
> ie
> optional SFX code
> Central Directory
> End of Central
>
> must all fit on one disk (the last one)
> the part files are a header followed by data
> ie
> header (consists of, at least, signature + sequence number)
> Data
>
>
> Central Directory too big to fit on one disk?
> - no problems just compress it as special entry in main file directory.
> ('###DIRECTORY.ZIP' ?)
> This would be automatically expanded (and used).
>
> Problems -
> If Directory must be compressed, it would need to follow all other data
> (so need to load multiple disks to get Directory)
> Biggest problem is - if main file won't entirely fit on last disk (in
> space not used by last part of data) that space is waisted!
> not compatible with anything else though the main file could be listed with
> anything
> (may only show '###DIRECTORY.ZIP' ?)
> Cannot be done with ZipMaster as yet!
>
> Russell Peters
> http://www.users.bigpond.com/russellpeters/delphizip.html
>
>
>
>
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