Nintendo Switch Brew

CNMT: Difference between revisions

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Add info on extra data for patches
Line 174: Line 174:


This is used for SystemUpdate, see here: [[Content_Manager_services#GetUpdateTitleList]].
This is used for SystemUpdate, see here: [[Content_Manager_services#GetUpdateTitleList]].
== Extended data ==
Patch-type cnmt files include an extended data section.
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 4
| Number of previous cnmt entries.
|-
| 0x4
| 4
| Number of previous delta entries.
|-
| 0x8
| 4
| Number of delta info entries.
|-
| 0xC
| 4
| Number of delta application info entries.
|-
| 0x10
| 4
| Number of previous content entries.
|-
| 0x14
| 4
| Number of delta content entries.
|-
| 0x18
| 4
| Unused?
|-
| 0x1C
| 0x38*X
| Previous cnmt entries
|-
|
| 0x28*X
| Previous delta entries
|-
|
| 0x28*X
| Delta info entries
|-
|
| 0x34*X
| Delta application info entries
|-
|
| 0x18*X
| Previous content entries
|-
|
| 0x38*X
| Delta content entries. (Standard content records)
|-
|
| 4
| Unknown
|-
|
| 4
| Unknown
|-
|
| 4
| Unknown
|-
|}
== Previous cnmt records ==
Each entry is 0x38 bytes:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 8
| Title ID
|-
| 0x8
| 4
| Title version
|-
| 0xC
| 1
| Type (see [[Content_Manager_services#Title_Types|Title Types]])
|-
| 0xD
| 3
| Unused?
|-
| 0x10
| 32
| Hash
|-
| 0x30
| 2
| Unknown
|-
| 0x32
| 2
| Unused?
|-
| 0x34
| 4
| Unused?
|-
|}
This contains information on previous metadata files.
== Previous delta records ==
Each entry is 0x28 bytes:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 8
| Old title ID
|-
| 0x8
| 8
| New title ID
|-
| 0x10
| 4
| Old title version
|-
| 0x14
| 4
| New title version
|-
| 0x18
| 8
| Size
|-
| 0x20
| 8
| Unused?
|-
|}
This contains information on previous delta patches.
== Delta info records ==
Each entry is 0x28 bytes:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 8
| Old title ID
|-
| 0x8
| 8
| New title ID
|-
| 0x10
| 4
| Old title version
|-
| 0x14
| 4
| New title version
|-
| 0x18
| 8
| Some sort of index?
|-
| 0x20
| 8
| Some sort of index?
|-
|}
This contains information on the current delta patch.
== Delta application info records ==
Each entry is 0x34 bytes:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 16
| Old NcaId
|-
| 0x10
| 16
| New NcaId
|-
| 0x20
| 6
| Old size
|-
| 0x26
| 2
| Upper 2 bytes of the new size
|-
| 0x28
| 4
| Lower 4 bytes of the new size
|-
| 0x2C
| 2
| Unknown
|-
| 0x2E
| 1
| Type (see [[Content_Manager_services#Title_Types|Title Types]])
|-
| 0x2F
| 1
| ? bit0 set = don't install?
|-
| 0x30
| 4
| Unused?
|-
|}
This contains information on how to apply deltas to the previous patch.
== Previous content records ==
Each entry is 0x18 bytes:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 16
| NcaId
|-
| 0x10
| 6
| Size
|-
| 0x16
| 1
| Type (see [[Content_Manager_services#Title_Types|Title Types]])
|-
| 0x17
| 1
|
|-
|}
This contains information on previous title content from earlier patches.
Retrieved from "https://switchbrew.org/wiki/CNMT"