Kovid Goyal added the comment:
FYI, the test I currently use in calibre, which has not failed so far for
millions of users:
def test_jpeg(h, f):
if (h[6:10] in (b'JFIF', b'Exif')) or (h[:2] == b'\xff\xd8' and (b'JFIF' in
h[:32] or b'8BIM' in h[:32])):
return 'jpeg'
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