def type_from_filename(filename)
      ext = filename.split('.').last
      ent = MMS2R::EXT.detect{|k,v| v == ext}
      ent.nil? ? nil : ent.first
    end
def type_from_filename(filename)
      ext = filename.split('.').last
      ent = MMS2R::EXT.detect{|k,v| v == ext}
      ent.nil? ? nil : ent.first
    end
def type_from_filename ( filename ) ext = filename . split ( '.' ) . last ent = MMS2R :: EXT . detect { | k , v | v == ext } ent . nil? ? nil : ent . first end
guess content type from filename
guess content type from filename