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= Headers, footers and protection =
This section lists the game-specific headers, footers and protections on the savegame. See the section on the [[Profile#Protection|profile page]] for per-platform protections.
 
==== All platforms ====▼
A 4 byte header specifying the length of the database is the first field in the save. All pointers in the database are relative to offset 4 in the file because of this. After the database is {{hex|0x47000}} bytes of null data. Additional data follows on PC.
 
==== PC ====▼
The database is followed by 1024 characters storing the login token. The token is followed by a chunk of length {{hex|0x10}}. If nobody is logged in, this is null. If an account is logged in, this stores a 32-bit integer with value <code>2</code>, 4 bytes of padding, and a 64-bit integer (or 32-bit with 4 bytes padding) which is presumably the account ID.▼
 
After this is a 128-bit hash used for savegame validation. Without recalculating the hash, saves cannot be modified. The algorithm used is currently unknown.
 
==== PC (Remastered) ====
The database is followed by a space character ({{hex|0x20}}), then the same 128-bit hash as is used in the original PC game. No padding is present.
 
==== Other platforms ====
No game-specific headers, footers or protections are present on other platforms.
 
= Row definitions =
Row definitions define the fields, or columns, used in each table. With different schema versions, new row definitions may be added and existing ones may be altered or removed.
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= Structures =
=== Savegame ===
This is the overall savegame structure. Only the MUD database itself is defined in Criterion's debugging symbols; the rest is independent research and prone to error.
 
==== Playstation 3, Xbox 360, PlayStation 4, Switch ====
{| class="wikitable"
! Offset !! Length !! Type !! Name !! Description !! Comments
|-
| 0x0 || 0x4 || uint32_t || ? || Database length || All pointers in the database are relative to offset 0x4 because of this
|-
| 0x4 || 0x40000 || [[#Mud::Db|Db]] || ? || MUD database ||
|-
| 0x40004 || 0x4700C || ? || ? || Unknown data, always null ||
|}
 
▲==== All platformsPC ====
{| class="wikitable"
! Offset !! Length !! Type !! Name !! Description !! Comments
|-
| 0x0 || 0x4 || uint32_t || ? || Database length || All pointers in the database are relative to offset 0x4 because of this
|-
| 0x4 || 0x40000 || [[#Mud::Db|Db]] || ? || MUD database ||
|-
| 0x40004 || 0x4700C || ? || ? || Unknown data, always null ||
|-
| 0x87010 || 0x410 || ? || ? || EA account/login information || See [[#Account info|account info]]
|-
| 0x87420 || 0x10 || ? || ? || 128-bit hash || Used for save validation. Unknown algorithm
|}
 
▲==== PC (Remastered) ====
{| class="wikitable"
! Offset !! Length !! Type !! Name !! Description !! Comments
|-
| 0x0 || 0x4 || uint32_t || ? || Database length || All pointers in the database are relative to offset 0x4 because of this
|-
| 0x4 || 0x40000 || [[#Mud::Db|Db]] || ? || MUD database ||
|-
| 0x40004 || 0x4700C || ? || ? || Unknown data, always null ||
|-
| 0x87010 || 0x1 || char || ? || Unused. Replaces account info || Always 0x20
|-
| 0x87011 || 0x10 || ? || ? || 128-bit hash || Used for save validation. Unknown algorithm. Not padded
|}
 
=== Mud::Db ===
==== 32-bit ====
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|-
| 0x8 || 0x4 || int32_t || miNumPages || || Always 0x22F
|}
 
=== Account info ===
▲'''PC only.''' The database is followed by 1024 characters storing the login token. The token is followed by a chunk of length {{hex|0x10}}.-long If nobody is logged in, this is null. If an account is logged in,chunk thiswhich stores a 32-bit integer with value <code>2</code>, 4 bytes of padding, and a 64-bit integer (or 32-bit with 4 bytes padding) which is presumably the account ID.
{| class="wikitable"
! Offset !! Length !! Type !! Name !! Description !! Comments
|-
| 0x0 || 0x400 || char[1024] || ? || Token ||
|-
| 0x400 || 0x4 || uint32_t || ? || Version? ||
|-
| 0x404 || 0x4 || || || Padding ||
|-
| 0x408 || 0x8 || uint64_t || ? || EA account ID || Possibly uint32_t followed by 4 bytes of padding
|}
 
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