file header
table1
table2
table3
...
All values used little-endian The "offset" is measured from the start of the file in bytes
| start | size | description |
|---|---|---|
| 00 | 4B | Magic number(0x534653aa, "SFS.") |
| 04 | 4B | CRC-32 |
| 08 | 4B | Version number |
| 0c | 4B | FIle size |
| 10 | 1B | The number of tables |
| 11 | 3B | Pad bytes |
| 14 | 64B | tables offset(uint32[16]) |
table header
record1
record2
...
free space
...
Varchar2
Varchar1
record metadata
Note that the free space in the table is located between the last record and varchar, and that varchars are in reverse order. This way, new record and varchar can simply be added without having torearrange existing items. New record go after the last record, and new varchar before the first(physical) varchar.
All values used little-endian The "offset" is measured from the start of the table in bytes
| start | size | description |
|---|---|---|
| 00 | 4B | total size of the Table( include the table header) |
| 04 | 4B | Free space left in the table |
| 08 | 4B | Space usd to store data in the table(except header and recordMeta) |
| 0c | 4B | Number of Varchars in the table |
| 10 | 4B | Number of Records in the table |
| 14 | 4B | size of a record |
| 18 | 4B | offset to the Record metadata in the table |
| 1c | 4B | offset to the last Varchar in the table() |
| 20 | 4B | The database's offset(a unsigned integer) |
| start | size | description |
|---|---|---|
| 00 | 4B | the length of the varchar content |
| 04 | 1B*length | varchar content |
record metadata is a special varchar
| start | size | description |
|---|---|---|
| 00 | 4B | the number of fields |
| 04 | 1B*fieldsNum | the length/type of fields |
the length of fields is a unsigned char means the size of the fields in bytes
if it is 0, the fields is a offset of a varchar, which is measured from the start of the table