Just Solve the File Format Problem - User contributions [en]

SFO

2026-08-18T04:55:11Z

Li: fix formatting

{{FormatInfo
|formattype=electronic
|subcat=Development
|extensions={{ext|sfo}}
}}

== Description ==

'''SFO''' / '''param.sfo''' is used for System Information and Paramaters for games and applications on PlayStation Consoles, such as the PlayStation Portable, PlayStation 3, PlayStation Vita, and PlayStation 4.
for storing metadata about a given program or applications - it is not used on the PlayStation 5, where they switched to using a JSON file instead,
and it is also not used in PlayStation Mobile, or on older consoles, such as the PS2 or PS1-

== Data Structure ==
the file is a binary format. and is made from very common primitives;
it stores key-value pairs, consisting of a header, a name table, and a value table;

=== File header ===
{| class="wikitable"
|-
! Data !! Offset !! Type !! Data
|-
| Magic || 0x00 || Int32LE || Always '''\0PSF'''
|-
| Version || 0x04 || Int32LE || '''0x1''' or '''0x101'''
|-
| KeyTable || 0x08 || Int32LE || Absolute position of Key Table
|-
| ValueTable || 0x0C || Int32LE || Absolute position of Value Table
|-
| Count || 0x10 || Int32LE || Total number of entries in the param file
|}

directly after the header, is a list of entries, there are '''Header.Count''' of these; it always begins at 0x14 ..

=== Entry list ===
{| class="wikitable"
|-
! Data !! Offset !! Type !! Data
|-
| Name Offset || 0x00 || Int16LE || Position of C-Style string containing key name; Header.KeyTable + Name Offset
|-
| Align || 0x02 || Int8 || Number of bytes to align each value to, usually 4 bytes.
|-
| Type || 0x03 || Int8 || Type of Value; Either BINARY = 0, STRING = 2, INT32LE = 4
|-
| Size || 0x04 || Int32LE || Size of the value in bytes;
|-
| TotalSize || 0x08 || Int32LE || Total reserved size of value buffer,
|-
| Data Offset || 0x0C || Depends on type; Either BINARY, STRING or INT32LE || Position of Value; Header.ValueTable + Data Offset
|}

each of the values in the '''value table''' are padded out to atleast 4 bytes (or whatever the 'align' value is)
however the keys are packed together separated only by nullbytes.

== See Also ==

* [https://www.psdevwiki.com/psp/PARAM.SFO PARAM.SFO - PSP Developer Wiki]
* [https://www.psdevwiki.com/vita/PARAM.SFO PARAM.SFO - Vita Developer Wiki]
* [https://www.psdevwiki.com/ps3/PARAM.SFO PARAM.SFO - PS3 Developer Wiki]
* [https://www.psdevwiki.com/ps4/PARAM.SFO PARAM.SFO - PS4 Developer Wiki]

== External Links ==
* [https://www.gamebrew.org/wiki/SFO_Editor_PSP LMAN Sfo Editor]

[[Category:Sony]]

SFO

2026-08-18T04:54:39Z

Li: Add basic overview of param.sfo file

{{FormatInfo
|formattype=electronic
|subcat=Development
|extensions={{ext|sfo}}
}}

== Description ==

'''SFO''' / ```param.sfo``` is used for System Information and Paramaters for games and applications on PlayStation Consoles, such as the PlayStation Portable, PlayStation 3, PlayStation Vita, and PlayStation 4.
for storing metadata about a given program or applications - it is not used on the PlayStation 5, where they switched to using a JSON file instead,
and it is also not used in PlayStation Mobile, or on older consoles, such as the PS2 or PS1-

== Data Structure ==
the file is a binary format. and is made from very common primitives;
it stores key-value pairs, consisting of a header, a name table, and a value table;

=== File header ===
{| class="wikitable"
|-
! Data !! Offset !! Type !! Data
|-
| Magic || 0x00 || Int32LE || Always '''\0PSF'''
|-
| Version || 0x04 || Int32LE || '''0x1''' or '''0x101'''
|-
| KeyTable || 0x08 || Int32LE || Absolute position of Key Table
|-
| ValueTable || 0x0C || Int32LE || Absolute position of Value Table
|-
| Count || 0x10 || Int32LE || Total number of entries in the param file
|}

directly after the header, is a list of entries, there are '''Header.Count''' of these; it always begins at 0x14 ..

=== Entry list ===
{| class="wikitable"
|-
! Data !! Offset !! Type !! Data
|-
| Name Offset || 0x00 || Int16LE || Position of C-Style string containing key name; Header.KeyTable + Name Offset
|-
| Align || 0x02 || Int8 || Number of bytes to align each value to, usually 4 bytes.
|-
| Type || 0x03 || Int8 || Type of Value; Either BINARY = 0, STRING = 2, INT32LE = 4
|-
| Size || 0x04 || Int32LE || Size of the value in bytes;
|-
| TotalSize || 0x08 || Int32LE || Total reserved size of value buffer,
|-
| Data Offset || 0x0C || Depends on type; Either BINARY, STRING or INT32LE || Position of Value; Header.ValueTable + Data Offset
|}

each of the values in the '''value table''' are padded out to atleast 4 bytes (or whatever the 'align' value is)
however the keys are packed together separated only by nullbytes.

== See Also ==

* [https://www.psdevwiki.com/psp/PARAM.SFO PARAM.SFO - PSP Developer Wiki]
* [https://www.psdevwiki.com/vita/PARAM.SFO PARAM.SFO - Vita Developer Wiki]
* [https://www.psdevwiki.com/ps3/PARAM.SFO PARAM.SFO - PS3 Developer Wiki]
* [https://www.psdevwiki.com/ps4/PARAM.SFO PARAM.SFO - PS4 Developer Wiki]

== External Links ==
* [https://www.gamebrew.org/wiki/SFO_Editor_PSP LMAN Sfo Editor]

[[Category:Sony]]