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GregLand
Valued Contributor
Joined: 15 Jun 2004
Posts: 212
Location: FRANCE
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 Posted: Sun Mar 29, 2009 11:08 am Post subject: |
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I think so it's more relivable with the first 500 or 1000 characters.
Thanks for all ! |
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vdsalchemist
Admin Team
Joined: 23 Oct 2001
Posts: 1448
Location: Florida, USA
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| Posted: Mon Mar 30, 2009 7:01 pm Post subject: |
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| Dr. Dread wrote: | Dan's code should be quite reliable. But I'm also pretty sure that with VDS this kind of looping
would be sloooow if the file isn't small.
With binary files it would be OK, because the loop will probably find a binary-flagged char quite
soon and exit the loop. But with ASCII files you will loop through the entire file and that means
more than a million loops just for a 1MB file.
So I would suggest that you just do the check for perhaps the first 1000 chars only. Count the loops
and exit if you go beyond that count.
Greetz
Dr. Dread |
Hmm IMHO if your breaking out of the loop as soon as you find your first binary byte then I don't think it is going to be that slow. Most so called binary files usually don't have that many printable characters before a non-printable character is found. Also by using the BINFILE or the @NEW() you are not loading the whole file into memory since these use file streams. The only thing that I would do is nest Dan's code inside of code to check the file's extension. If the file does not have an extension that you reconize as a flatfile then do the brute force search of all the bytes in the file.
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Dr. Dread
Professional Member
Joined: 03 Aug 2001
Posts: 1065
Location: Copenhagen, Denmark
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| Posted: Tue Mar 31, 2009 6:22 am Post subject: |
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| dragonsphere wrote: |
Hmm IMHO if your breaking out of the loop as soon as you find your first binary byte then I don't think it is going to be that slow. |
As I already stated binary files would be OK, but with ASCII files the script will loop through the entire file,
and looping through for instance a 1MB file while calling a number of functions in each loop - that will be a
drag for sure.
Greetz
Dread
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