Param.sfo
PARAM.SFO
SFO (System File Object) file format can be also found on PSP, PSVITA, PS3.
This page, as well as talk page is mostly about speculation.
External Structure
Only on disc?
Internal Structure
Header SFO
This is the Header of a SFO file.
| Offset | Data | Length | Notes |
| 0x00 | 00 50 53 46 | 0x04 | " PSF" Magic |
| 0x04 | 01 01 00 00 | 0x04 | Version |
| 0x08 | xx xx 00 00 | 0x04 | Key table start offset |
| 0x0C | xx xx 00 00 | 0x04 | Data table start offset |
| 0x10 | xx 00 00 00 | 0x04 | № of parameters |
Index table
Starting at offset 0x14, this structure (0x10) is repeated the number of times defined in the header ( № of parameters)
| Offset | Data | Length | Notes |
| 0x14 | 00 00 | 0x02 | Key table offset |
| 0x16 | 04 0x | 0x02 | param_fmt (type of data) |
| 0x18 | xx xx 00 00 | 0x04 | parameter length |
| 0x1C | xx xx 00 00 | 0x04 | parameter max length |
| 0x20 | 00 00 00 00 | 0x04 | Data table offset |
Used on index table, type of data are:
| param_fmt | Format | Notes |
| 04 00 | utf-8 Special Mode | Used in contents generated by the system |
| 04 02 | utf-8 | Character string, NULL finished (0x00) |
| 04 04 | integer | 32 bits unsigned |
Key table
Ordered alphabetically, each name of parameters of this table is NULL terminated with 1 blank byte (0x00) to separate them.
The table has padding at the end to align their size to a multiply of 4 ( if matches with a multiply of 4 this padding doesn't exist)
Data table
- UTF-8 entries never uses all the reserved bytes, needs 1 blank byte after the last character.
- Integer entries uses all the reserved bytes.
Parameters Descriptions
APP_TYPE
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
...
APP_VER
param_max_len: 0x8 (8 bytes)
param_len: 0x6 (6 bytes)
The format is XX.YY where "XX" and "YY" are numbers, and the point "." is included in the string, e.g: 01.00 for the first stable version released.
ATTRIBUTE
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
Can contains 32 flags that can be turned on/off to activate/deactivate features allowed for the game/apps content.
CATEGORY
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
See PS Vita Category
| Value | Standard name |
| bd | Bluray Disc? |
| gd | - |
| gdk | - |
| gp | Game Patch? |
CONTENT_ID
param_max_len: 0x30 (48 bytes)
param_len: 0x25 (37 bytes)
The format is:
DISC_NUMBER
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
Disc number: count from 01.
DISC_TOTAL
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
Total number of discs for this game.
DISP_LOCATION_x
param_max_len: 0x4 (4 bytes)
param_len: 0x1? (1 bytes?)
DISP_LOCATION_1 & DISP_LOCATION_2
DOWNLOAD_DATA_SIZE
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
...
FORMAT
param_max_len: 0x4 (4 bytes)
param_len: 0x4? (4 bytes)
"obs"
PARENTAL_LEVEL
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
It is a scale to rate the content for the different users based in user profile settings and international rating systems as: PEGI, ESRB, CERO, etc...
PUBTOOLINFO
param_max_len: 0x200 (512 bytes)
param_len:variable
Contains infos:
- c_date=
- sdk_ver=
- st_type=
- asa=
- img0_l0_size=
- img0_l1_size=
- img0_ch_size=
SERVICE_ID_ADDCONT_ADD_x
param_max_len: 0x14 (20 bytes)
param_len:Not used?
Same parameter outnumbered from _1 to _7.
SYSTEM_ROOT_VER
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
Minimum FW to be play this game?
SYSTEM_VER
param_max_len: 0x4 (4 bytes)
param_len: 0x4 (4 bytes)
Minimum FW to be play this game?
TITLE
param_max_len: 0x80 (128 bytes)
param_len: variable
Default "title of the game" for all languages.
TITLE_ID
param_max_len: 0x0C (12 bytes)
param_len: 0xA (10 bytes)
Identifier of the content, in the format WXYZ12345.
TITLE_xx
param_max_len: 0x80 (128 bytes)
param_len: variable
Same than TITLE but for localized languages.
An .SFO can contain several TITLE_xx where xx is a number for a regional code.
The "default" TITLE is always present when other "localized" TITLE_xx are used.
VERSION
param_max_len: 0x8 (8 bytes)
param_len: 0x6 (6 bytes)
Version content of the game: Disc revision, or Package revision. The number increases when the content is re-released or re-packaged for whatever reason that doesn't affect the main executable (e.g. when a disc game reaches platinum sales, or "game of the year edition" including extra contents).
