= Magic Numbers =
Magic numbers might help identify file types
 * https://en.wikipedia.org/wiki/List_of_file_signatures
 * https://gist.github.com/leommoore/f9e57ba2aa4bf197ebc5

|| '''Type''' || '''Hex signature''' ||
|| jpeg || ff d8 ff ||
|| png || 89 50 4e 47 ||
|| bz2 || 42 5A 68 ||
|| gif || 47 49 46 38 37 61 ||
|| gif || 47 49 46 38 39 61 ||
|| zip jar apk docx ipa pptx xlsx || 50 4B 03 04 ||