[softwarelist] Re: Bad CRCs in ZIPs
- From: David Pilling <david@xxxxxxxxxxxxxxxx>
- To: davidpilling@xxxxxxxxxxxxx
- Date: Wed, 2 Jan 2019 17:47:55 +0000
Hi,
On 02/01/2019 13:27, J.G.Harston wrote:
I've recently notice an oddity with ZIPs created on my Windows system
with WinRAR and then transfered to my RISC OS system. Consistantly, if
there is a zip within the zip, the inner zip is corrupted.
Actually corrupted or just the CRC, or just when read on RISC OS. If it
is actually corrupt then presumably the blame lies with WinRAR.
The oddity though is that SparkFS does not complain
Assume slapdash programmer not bothering with CRCs in order to save
processor time - justified by the fact that if the data is corrupt
you're going to get a serious error - it is unlikely to unpack.
Which raises the question how bad is the corruption.
Zips in zips (or archives in archives) present problems for SparkFS
because it means the filing system has to be re-entrant, which latter
versions were.
If you're just using a file based archiver - WinRAR (I would guess),
then zips are just files to be added to an archive - and I can't see why
it would corrupt them in particular.
--
David Pilling
www.davidpilling.com
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