From: Wes Gamble <weyus@...>
Date: 2006-03-22T08:46:39+09:00
Subject: Newbie: Better way to check a magic number on a file?

All,

I am trying to determine if I am dealing with an Excel file that I 
upload to a Web server.

Here is the first test - to verify the magic number of the file that I 
have:

#Check the magic number first to see if it's even an Office file

    magic_number = nil
    File.open(path_to_file, "r") do |f|
      magic_number = f.read(6)
    end
    return false unless 
magic_number.unpack('H*').to_s().eql?('d0cf11e0a1b1')

This seems a little bit less than optimal.  I have to unpack my string 
into an array and then reconvert it back to a string to compare it?

Surely there is a simpler way?

Should magic_number.eql?('d0cf11e0a1b1') work?

Wes

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