public static String getFileHeader(InputStream is) {
		
		byte[] b = new byte[28];
		
		try {
			is.read(b);
		} catch (IOException e) {
			LOGGER.info("InputStream Reading Error!");
		} finally {
			if (is != null) {
				try {
					is.close();
				} catch (IOException e) {
					LOGGER.info("InputStream Closing Error!");
				}
			}
		}
		
		return bytesToHexString(b).toUpperCase();
	}