public static long convertLongFromBytes(byte[] bytes) {
        return convertLongFromBytes(bytes, 0);
    }
Read in a long from an InputStream

@param inputStream
           The InputStream used to read the long
@return A long, which is the next 8 bytes converted from the InputStream
@throws IOException
            Thrown if there is a problem reading from the InputStream
jme3-core/src/plugins/java/com/jme3/export/binary/ByteUtils.java