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Credit goes to User:Wwylele. https://gist.github.com/wwylele/29a8caa6f5e5a7d88a00bedae90472ed
<span id="cec-system-save-00010026-format"></span>
== CEC System Save (00010026) Format ==
<pre>Folder and files `CecDataPathType`
[Root]
├── eventlog.dat
└── CEC 10
├── MacFilter___
├── MBoxList____ 1
├── <8-digit ID> 11
│ ├── MBoxInfo____ 2
│ ├── MBoxData.001 101
│ ├── MBoxData.010 110
│ ├── MBoxData.050 150
│ ├── MBoxData.<3-digit number> 100 + <number>
│ ├── ...
│ ├── InBox___ 12
│ │ ├── BoxInfo_____ 3
│ │ ├── _<12-char ID> 6
│ │ └── ...
│ └── OutBox__ 13
│ ├── BoxInfo_____ 4
│ ├── OBIndex_____ 5
│ ├── _<12-char ID> 7
│ └── ...
├── <8-digit ID>
...</pre>
<span id="file-mboxlist____"></span>
=== File <code>MBoxList____</code> ===
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6868
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Version? always 1
|-
| 0x08
| 4
| Number of boxes
|-
| 0x0C
| 16 * 24
| List of box name
|}
Each box name is 16-char long. However, due to the fact that box name is usually a 8-digit ID, the rest of 8 chars are always null characters. Unused box names are filled with null characters.
<span id="file-mboxinfo____"></span>
=== File <code>MBoxInfo____</code> ===
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6363
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Title ID (matches the box directory name)
|-
| 0x08
| 4
| Private ID?
|-
| 0x0C
| 1
| Flags?
|-
| 0x0D
| 1
| Flags?
|-
| 0x0E
| 2
| Padding
|-
| 0x10
| 32
| HMAC Key
|-
| 0x30
| 4
| Zero?
|-
| 0x34
| 12
| Timestamp when last accessed
|-
| 0x40
| 1
| Flag?
|-
| 0x41
| 1
| Flag?
|-
| 0x42
| 1
| Flag?
|-
| 0x43
| 1
| Flag?
|-
| 0x44
| 12
| Timestamp when last received
|-
| 0x50
| 16
| Zero?
|}
Note: - <code>Private ID</code> seems to be a number chosen by application arbitrarily, possibly for verification. Magic numbers such as 0x00000000, 0x00000001, 0xFFFFFFFF, 0xAABBCCDD and other random numbers have been observed here.
<span id="file-mboxdata.3-digit-number"></span>
=== File <code>MBoxData.<3-digit number></code> ===
<span id="file-mboxdata.001"></span>
==== File <code>MBoxData.001</code> ====
Icon
<span id="file-mboxdata.010"></span>
==== File <code>MBoxData.010</code> ====
This is the game title in null-terminated UTF-16 string.
<span id="file-mboxdata.050"></span>
==== File <code>MBoxData.050</code> ====
This is 8-byte file containing the title ID.
<span id="file-boxinfo_____"></span>
=== File <code>BoxInfo_____</code> ===
This file consists of a 0x20-byte header, and an array of 0x70-byte entry. Each entry is a copy of the message header. See the next section for the message header format. The box info header format is
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6262
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Size of this file
|-
| 0x08
| 4
| Maximum box size
|-
| 0x0C
| 4
| Current box size
|-
| 0x10
| 4
| Maximum message count
|-
| 0x14
| 4
| Current message count / the size of the following array
|-
| 0x18
| 4
| Maximum batch size
|-
| 0x1C
| 4
| Maximum message size
|}
<span id="file-_12-char-id"></span>
=== File <code>_<12-char ID></code> ===
Each such file is a message. The ID in the file name is the message ID encoded in base-64. A message file consists of a 0x70-byte header, several extra header, a message body, and a 0x20-byte HMAC(?).
The header format is
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6060
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Message size
|-
| 0x08
| 4
| Header + extra headers size
|-
| 0x0C
| 4
| Body size
|-
| 0x10
| 4
| Title ID
|-
| 0x14
| 4
| Title ID 2?
|-
| 0x18
| 4
| Batch ID
|-
| 0x1C
| 4
| ? ID
|-
| 0x20
| 8
| Message ID
|-
| 0x28
| 4
| Message version?
|-
| 0x2C
| 8
| Message ID 2?
|-
| 0x34
| 1
| Flags
|-
| 0x35
| 1
| Send method
|-
| 0x36
| 1
| Is unopen
|-
| 0x37
| 1
| Is new
|-
| 0x38
| 8
| Sender ID
|-
| 0x40
| 8
| Sender ID 2?
|-
| 0x48
| 12
| Timestamp when sent
|-
| 0x54
| 12
| Timestamp when received
|-
| 0x60
| 12
| Timestamp when created
|-
| 0x6C
| 1
| Send count
|-
| 0x6D
| 1
| Forward count
|-
| 0x6E
| 2
| User data
|}
Each extra header has a format of
{|
! Offset
! Length
! Description
|-
| 0x00
| 4
| Header type
|-
| 0x04
| 4
| Data size
|-
| 0x08
| Data size
| Header data
|}
The header type can be one of the follows:
{|
! Value
! Description
|-
| 1
| ?
|-
| 2
| Icon
|-
| 3
| Game name
|-
| 4
| Info text
|-
| 5
| Region?
|}
== CEC System Save (00010026) Format ==
<pre>Folder and files `CecDataPathType`
[Root]
├── eventlog.dat
└── CEC 10
├── MacFilter___
├── MBoxList____ 1
├── <8-digit ID> 11
│ ├── MBoxInfo____ 2
│ ├── MBoxData.001 101
│ ├── MBoxData.010 110
│ ├── MBoxData.050 150
│ ├── MBoxData.<3-digit number> 100 + <number>
│ ├── ...
│ ├── InBox___ 12
│ │ ├── BoxInfo_____ 3
│ │ ├── _<12-char ID> 6
│ │ └── ...
│ └── OutBox__ 13
│ ├── BoxInfo_____ 4
│ ├── OBIndex_____ 5
│ ├── _<12-char ID> 7
│ └── ...
├── <8-digit ID>
...</pre>
<span id="file-mboxlist____"></span>
=== File <code>MBoxList____</code> ===
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6868
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Version? always 1
|-
| 0x08
| 4
| Number of boxes
|-
| 0x0C
| 16 * 24
| List of box name
|}
Each box name is 16-char long. However, due to the fact that box name is usually a 8-digit ID, the rest of 8 chars are always null characters. Unused box names are filled with null characters.
<span id="file-mboxinfo____"></span>
=== File <code>MBoxInfo____</code> ===
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6363
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Title ID (matches the box directory name)
|-
| 0x08
| 4
| Private ID?
|-
| 0x0C
| 1
| Flags?
|-
| 0x0D
| 1
| Flags?
|-
| 0x0E
| 2
| Padding
|-
| 0x10
| 32
| HMAC Key
|-
| 0x30
| 4
| Zero?
|-
| 0x34
| 12
| Timestamp when last accessed
|-
| 0x40
| 1
| Flag?
|-
| 0x41
| 1
| Flag?
|-
| 0x42
| 1
| Flag?
|-
| 0x43
| 1
| Flag?
|-
| 0x44
| 12
| Timestamp when last received
|-
| 0x50
| 16
| Zero?
|}
Note: - <code>Private ID</code> seems to be a number chosen by application arbitrarily, possibly for verification. Magic numbers such as 0x00000000, 0x00000001, 0xFFFFFFFF, 0xAABBCCDD and other random numbers have been observed here.
<span id="file-mboxdata.3-digit-number"></span>
=== File <code>MBoxData.<3-digit number></code> ===
<span id="file-mboxdata.001"></span>
==== File <code>MBoxData.001</code> ====
Icon
<span id="file-mboxdata.010"></span>
==== File <code>MBoxData.010</code> ====
This is the game title in null-terminated UTF-16 string.
<span id="file-mboxdata.050"></span>
==== File <code>MBoxData.050</code> ====
This is 8-byte file containing the title ID.
<span id="file-boxinfo_____"></span>
=== File <code>BoxInfo_____</code> ===
This file consists of a 0x20-byte header, and an array of 0x70-byte entry. Each entry is a copy of the message header. See the next section for the message header format. The box info header format is
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6262
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Size of this file
|-
| 0x08
| 4
| Maximum box size
|-
| 0x0C
| 4
| Current box size
|-
| 0x10
| 4
| Maximum message count
|-
| 0x14
| 4
| Current message count / the size of the following array
|-
| 0x18
| 4
| Maximum batch size
|-
| 0x1C
| 4
| Maximum message size
|}
<span id="file-_12-char-id"></span>
=== File <code>_<12-char ID></code> ===
Each such file is a message. The ID in the file name is the message ID encoded in base-64. A message file consists of a 0x70-byte header, several extra header, a message body, and a 0x20-byte HMAC(?).
The header format is
{|
! Offset
! Length
! Description
|-
| 0x00
| 2
| Magic 0x6060
|-
| 0x02
| 2
| Padding
|-
| 0x04
| 4
| Message size
|-
| 0x08
| 4
| Header + extra headers size
|-
| 0x0C
| 4
| Body size
|-
| 0x10
| 4
| Title ID
|-
| 0x14
| 4
| Title ID 2?
|-
| 0x18
| 4
| Batch ID
|-
| 0x1C
| 4
| ? ID
|-
| 0x20
| 8
| Message ID
|-
| 0x28
| 4
| Message version?
|-
| 0x2C
| 8
| Message ID 2?
|-
| 0x34
| 1
| Flags
|-
| 0x35
| 1
| Send method
|-
| 0x36
| 1
| Is unopen
|-
| 0x37
| 1
| Is new
|-
| 0x38
| 8
| Sender ID
|-
| 0x40
| 8
| Sender ID 2?
|-
| 0x48
| 12
| Timestamp when sent
|-
| 0x54
| 12
| Timestamp when received
|-
| 0x60
| 12
| Timestamp when created
|-
| 0x6C
| 1
| Send count
|-
| 0x6D
| 1
| Forward count
|-
| 0x6E
| 2
| User data
|}
Each extra header has a format of
{|
! Offset
! Length
! Description
|-
| 0x00
| 4
| Header type
|-
| 0x04
| 4
| Data size
|-
| 0x08
| Data size
| Header data
|}
The header type can be one of the follows:
{|
! Value
! Description
|-
| 1
| ?
|-
| 2
| Icon
|-
| 3
| Game name
|-
| 4
| Info text
|-
| 5
| Region?
|}