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oleriesenberg/gist:1225301

Created September 18, 2011 17:24
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gistfile1.rb
def determine_mime_type(io)
blob = io.read(10)
return 'image/gif' if blob.match(/^GIF8/)
return 'image/png' if blob.match(/^\x89PNG/)
return 'image/jpeg' if blob.match(/^\xff\xd8\xff\xe0\x00\x10JFIF/)
return 'image/jpeg' if blob.match(/^\xff\xd8\xff\xe1(.*){2}Exif/)
'unknown'
end
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