udf_ea_cksum
if (udf_rw16(*spos) != udf_ea_cksum((uint8_t *) implext))
*spos = udf_rw16(udf_ea_cksum((uint8_t *) implext));
*spos = udf_rw16(udf_ea_cksum((uint8_t *) implext));
uint16_t udf_ea_cksum(uint8_t *data);
if (udf_rw16(*spos) != udf_ea_cksum((uint8_t *) implext))
*spos = udf_rw16(udf_ea_cksum((uint8_t *) implext));
*spos = udf_rw16(udf_ea_cksum((uint8_t *) implext));