Re: Checking whether a file is a genuine PDF file
Re: Checking whether a file is a genuine PDF file
- Subject: Re: Checking whether a file is a genuine PDF file
- From: Graham Cox <email@hidden>
- Date: Tue, 6 Oct 2009 12:30:27 +1100
On 04/10/2009, at 11:07 PM, Squ Aire wrote:
But that isn't good enough really, because a file can have the pdf
extension without being a true PDF file.
This is true, but how far are you prepared to go? Others have
suggested checking a few bytes into the file's header which should be
reasonable enough, but I could create a file having a valid PDF header
and garbage thereafter... you cannot protect yourself against that
sort of thing, so the question is where your code would draw the line.
Most people would draw it with a simple check of the extension and
maybe for files that traditionally have been subject to extension
abuse (I don't think pdf is one of them), a few header bytes.
What is it you're afraid of?
--Graham
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