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Re: Re: how to tell if a file is still being modified

by nimdokk (Vicar)
on Sep 16, 2003 at 10:10 UTC ( #291778=note: print w/ replies, xml ) Need Help??

in reply to Re: how to tell if a file is still being modified
in thread how to tell if a file is still being modified

I have considered option 3, but it feels a bit too kludgy and there's always the possibility that different versions of zip behave differently since there is no standard for creating zip archives. I'm still keeping it in the back of my mind though since as you pointed out, option 2 can cause problems when the "trigger" file is loaded without verifying that the original file arrived correctly, or I've also seen cases where someone will load a trigger file without sending the data file (or the other way around). I'd say that it works 80-90% of the time which is good. Its just that 10-20% when it does not that is annoying, especially when you get paged at 3am because some idjit mistakenly created a data file without a trigger, or vice versa. The best solution would perhaps be a combination of some or all of these options (provided a workable solution could be created easily) :-)

"Ex libris un peut de tout"

Comment on Re: Re: how to tell if a file is still being modified
Re: Re: Re: how to tell if a file is still being modified
by Roger (Parson) on Sep 16, 2003 at 23:30 UTC
    I agree with you on the diversity of versions of ZIP out there. I'd say most of the differences would be in its encryption algorithm. (I am not in the US, so I am using the export version of the strong encryption algorithm to compile my ZIP program, hmmm, perhaps that is why I still haven't had any problems yet.) Provided there is no encryption requirement, ZIP is still a good solution though. And of cause if there was any problem, it would show up in the testing phase, wouldn't it?
      Personally, I haven't explored all the options with ZIP files. However, we don't always have folks uploading ZIPs. What I was initially looking for was some sort of EOF marker that I could count on. But I think someone else mentioned the MD5 hash which is something I thought about, but have not yet explored. Unfortunately, since the issue has come up, we have had bigger problems to worry about.

      "Ex libris un peut de tout"

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