Backup diff of SoundFont/format vs current(No. 1)

- 4B -><- 4B -><- 4B->

+------+-------+------+---------+---------+---------+

| RIFF | sizeF | sfbk | LIST ...| LIST ...| LIST ...|

+------+-------+------+---------+---------+---------+

- 4B -><- 4B -><- 4B->

<--- sizeF -------------------------->

• sizeF = fileLength - 8;

sfbk 以降

INFO-list

• sizeF = fileLength - 8;

+------+-------+------+---------+---------+---------+
| LIST | sizeL | INFO | <chunk> | <chunk> | ...     |
+------+-------+------+---------+---------+---------+

sdta-list

+------+-------+------+---------+---------+---------+
| LIST | sizeL | sdta | <chunk> | <chunk> | ...     |
+------+-------+------+---------+---------+---------+

+------+-------+------+---------+---------+---------+
| LIST | sizeL | pdta | <chunk> | <chunk> | ...     |
+------+-------+------+---------+---------+---------+