identify-filetype
Identifies the file-type of a buffer using the magic-number signatures at the start of the file.
var identify = console // => string | false
Supported types:
jpg png gif bmp tif tif nif ico psd rar zip gz msi iso rtf avi wmv wma swf flv mid pdf doc docx mp3 svg html
Tested:
tif pdf psd gif jpg png bmp tif ico rar docx gz doc rtf svg html