Test file for PDF-ness?

From: Maxim Belushkin (m.belushkin_at_fz-juelich.de)
Date: 10/31/03 

Date: Fri, 31 Oct 2003 11:00:30 +0100

   Problem: check a file if it is really a PDF file.

  Given an arbitrary file (basically, uploaded by a user, or, better
say, upload being attempted), I have to check if it has signs of being
really a PDF file. Is there anything common among PDF files in the
header, and if so - what and where?

  Thanks for any advice in advance. 

-- 
Max Belushkin

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