Nintendo Switch Brew

CNMT: Difference between revisions

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= Metadata file =
This is the metadata file that ends in <code>".cnmt{.nca}"</code> or <code>"meta0.ncd"</code>. This seems to replace the TMD format.
This is the file that ends in <code>".cnmt.nca"</code> or <code>"meta0.ncd"</code>.
 
The official name for CNMT is "PackagedContentMeta".
 
= PackagedContentMetaHeader =
This is "nn::ncm::PackagedContentMetaHeader".


It starts with an header:
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
Line 10: Line 13:
|-
|-
| 0x0
| 0x0
| 8
| 0x8
| Patch title id
| Id
|-
|-
| 0x8
| 0x8
| 4
| 0x4
|
| Version
|-
|-
| 0xC
| 0xC
| 1
| 0x1
| Type (see [[Content_Manager_services#Title_Types|Title Types]])
| [[NCM_services#ContentMetaType|ContentMetaType]]
|-
|-
| 0xD
| 0xD
| 1
| 0x1
|
| [17.0.0+] [[NCM_services#ContentMetaPlatform|ContentMetaPlatform]] ([1.0.0-16.1.0] Reserved)
|-
|-
| 0xE
| 0xE
| 2
| 0x2
| Offset to table
| ExtendedHeaderSize
|-
|-
| 0x10
| 0x10
| 2
| 0x2
| Number of entries
| ContentCount
|-
|-
| 0x12
| 0x12
| 14
| 0x2
|
| ContentMetaCount
|-
| 0x14
| 0x1
| [[NCM_services#ContentMetaAttributes|ContentMetaAttributes]]
|-
| 0x15
| 0x3
| Reserved
|-
| 0x18
| 0x4
| RequiredDownloadSystemVersion
|-
| 0x1C
| 0x4
| Reserved
|}
 
= SystemUpdateMetaExtendedHeader =
This is "nn::ncm::SystemUpdateMetaExtendedHeader".
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| ExtendedDataSize
|}
 
= ApplicationMetaExtendedHeader =
This is "nn::ncm::ApplicationMetaExtendedHeader".
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| PatchId
|-
| 0x8
| 0x4
| RequiredSystemVersion
|-
| 0xC
| 0x4
| RequiredApplicationVersion
|}
 
= PatchMetaExtendedHeader =
This is "nn::ncm::PatchMetaExtendedHeader".
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| ApplicationId
|-
| 0x8
| 0x4
| RequiredSystemVersion
|-
| 0xC
| 0x4
| ExtendedDataSize
|-
| 0x10
| 0x8
| Reserved
|}
 
= AddOnContentMetaExtendedHeader =
This is "nn::ncm::AddOnContentMetaExtendedHeader".
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| ApplicationId
|-
| 0x8
| 0x4
| RequiredApplicationVersion
|-
| 0xC
| 0x1
| [15.0.0+] ContentAccessibilities ([1.0.0-14.1.2] Reserved)
|-
| 0xD
| 0x3
| Reserved
|-
|-
| 0x20
| 0x10
| 16
| 0x8
| Original title-id
| [15.0.0+] DataPatchId
|}
 
= DeltaMetaExtendedHeader =
This is "nn::ncm::DeltaMetaExtendedHeader".
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| ApplicationId
|-
| 0x8
| 0x4
| ExtendedDataSize
|-
| 0xC
| 0x4
| Reserved
|}
 
= DataPatchMetaExtendedHeader =
This is "nn::ncm::DataPatchMetaExtendedHeader".
 
This was added with [15.0.0+].
 
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| DataId
|-
| 0x8
| 0x8
| ApplicationId
|-
| 0x10
| 0x4
| RequiredApplicationVersion
|-
| 0x14
| 0x4
| ExtendedDataSize
|-
| 0x18
| 0x8
| Reserved
|}
|}


Each entry is 0x38 bytes:
= PackagedContentInfo =
This is "nn::ncm::PackagedContentInfo".


{| class="wikitable" border="1"
{| class="wikitable" border="1"
Line 51: Line 213:
|-
|-
| 0x0
| 0x0
| 32
| 0x20
| Hash
| Hash (SHA256 of the referenced content)
|-
|-
| 0x20
| 0x20
| 16
| 0x10
| NcaId [same as first 16-bytes of hash]
| ContentId
|-
|-
| 0x30
| 0x30
| 6
| [15.0.0+] 0x5 ([1.0.0-14.1.2] 0x6)
| Size
| Size
|-
| 0x35
| 0x1
| [15.0.0+] ContentAttributes
|-
|-
| 0x36
| 0x36
| 1
| 0x1
| Type (0=meta, 1=program, 2=data, 3=control, 4=html, 5=legal)
| [[NCM_services#ContentType|ContentType]]
|-
|-
| 0x37
| 0x37
| 1
| 0x1
|
| IdOffset
|}
|}
= ContentMetaInfo =
This is "nn::ncm::ContentMetaInfo".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| Id
|-
| 0x8
| 0x4
| Version
|-
| 0xC
| 0x1
| [[NCM_services#ContentMetaType|ContentMetaType]]
|-
| 0xD
| 0x1
| [[NCM_services#ContentMetaAttributes|ContentMetaAttributes]]
|-
| 0xE
| 0x2
| Reserved
|}
This is used for SystemUpdate, see here: [[NCM_services#ReadEntryMetaRecords]].
= SystemUpdateMetaExtendedData =
This is "nn::ncm::SystemUpdateMetaExtendedData".
If the Version field is 1, the format is:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Version
|-
| 0x4
| 0x4
| VariationCount
|-
| 0x8
| 0x20 * VariationCount
| [[#FirmwareVariationInfo|FirmwareVariationInfo]] (Version 1)
|}
If the Version field is 2, the format is:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| Version
|-
| 0x4
| 0x4
| VariationCount
|-
| 0x8
| 0x4 * VariationCount
| FirmwareVariationId
|-
| Variable
| 0x20 * VariationCount
| [[#FirmwareVariationInfo|FirmwareVariationInfo]] (Version 2)
|-
| Variable
| 0x10 * MetaCount (from [[#FirmwareVariationInfo|FirmwareVariationInfo]] (Version 2))
| [[#ContentMetaInfo|ContentMetaInfo]] (if ReferToBase is False)
|}
== FirmwareVariationInfo ==
This is "FirmwareVariationInfo ".
If the Version field is 1, the format is:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| FirmwareVariationId
|-
| 0x4
| 0x1C
| Reserved
|}
If the Version field is 2, the format is:
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x1
| ReferToBase (0=False, 1=True)
|-
| 0x1
| 0x3
| Reserved
|-
| 0x4
| 0x4
| MetaCount
|-
| 0x8
| 0x18
| Reserved
|}
= PatchMetaExtendedData =
This is "nn::ncm::PatchMetaExtendedData".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x4
| PatchHistoryHeaderCount
|-
| 0x4
| 0x4
| PatchDeltaHistoryCount
|-
| 0x8
| 0x4
| PatchDeltaHeaderCount
|-
| 0xC
| 0x4
| FragmentSetCount
|-
| 0x10
| 0x4
| PatchHistoryContentInfoCount
|-
| 0x14
| 0x4
| PatchDeltaPackagedContentInfoCount
|-
| 0x18
| 0x4
| Reserved
|-
| 0x1C
| 0x38 * PatchHistoryHeaderCount
| [[#PatchHistoryHeader|PatchHistoryHeader]]
|-
| Variable
| 0x28 * PatchDeltaHistoryCount
| [[#PatchDeltaHistory|PatchDeltaHistory]]
|-
| Variable
| 0x28 * PatchDeltaHeaderCount
| [[#PatchDeltaHeader|PatchDeltaHeader]]
|-
| Variable
| 0x34 * FragmentSetCount
| [[#FragmentSet|FragmentSet]]
|-
| Variable
| 0x18 * PatchHistoryContentInfoCount
| [[#PackagedContentInfo|PatchHistoryContentInfo]] ([[#PackagedContentInfo|PackagedContentInfo]] without the Hash entry)
|-
| Variable
| 0x38 * PatchDeltaPackagedContentInfoCount
| [[#PackagedContentInfo|PatchDeltaPackagedContentInfo]]
|-
| Variable
| 0x4 * FragmentIndicatorCount (from [[#FragmentSet|FragmentSet]])
| [[#FragmentIndicator|FragmentIndicator]]
|}
== PatchHistoryHeader ==
This is "nn::ncm::PatchHistoryHeader".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x10
| ContentMetaKey
|-
| 0x10
| 0x20
| Digest
|-
| 0x30
| 0x2
| ContentInfoCount
|-
| 0x32
| 0x6
| Reserved
|}
== PatchDeltaHistory ==
This is "nn::ncm::PatchDeltaHistory".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| SourcePatchId
|-
| 0x8
| 0x8
| DestinationPatchId
|-
| 0x10
| 0x4
| SourceVersion
|-
| 0x14
| 0x4
| DestinationVersion
|-
| 0x18
| 0x8
| DownloadSize
|-
| 0x20
| 0x8
| Reserved
|}
== PatchDeltaHeader ==
This is "nn::ncm::PatchDeltaHeader".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| SourcePatchId
|-
| 0x8
| 8
| DestinationPatchId
|-
| 0x10
| 0x4
| SourceVersion
|-
| 0x14
| 0x4
| DestinationVersion
|-
| 0x18
| 0x2
| FragmentSetCount
|-
| 0x1A
| 0x6
| Reserved
|-
| 0x20
| 0x2
| ContentInfoCount
|-
| 0x22
| 0x6
| Reserved
|}
== FragmentSet ==
This is "nn::ncm::FragmentSet".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x10
| SourceContentId
|-
| 0x10
| 0x10
| DestinationContentId
|-
| 0x20
| 0x6
| SourceSize
|-
| 0x26
| 0x6
| DestinationSize
|-
| 0x2C
| 0x2
| FragmentIndicatorCount
|-
| 0x2E
| 0x1
| [[NCM_services#ContentMetaType|FragmentTargetContentType]]
|-
| 0x2F
| 0x1
| UpdateType (0=ApplyAsDelta, 1=Overwrite, 2=Create)
|-
| 0x30
| 0x4
| Reserved
|}
== FragmentIndicator ==
This is "nn::ncm::FragmentIndicator".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x2
| ContentInfoIndex
|-
| 0x2
| 0x2
| FragmentIndex
|}
= DeltaMetaExtendedData =
This is "nn::ncm::DeltaMetaExtendedData".
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x8
| SourcePatchId
|-
| 0x8
| 0x8
| DestinationPatchId
|-
| 0x10
| 0x4
| SourceVersion
|-
| 0x14
| 0x4
| DestinationVersion
|-
| 0x18
| 0x2
| FragmentSetCount
|-
| 0x1A
| 0x6
| Reserved
|-
| 0x20
| 0x34 * FragmentSetCount
| [[#FragmentSet|FragmentSet]]
|-
| Variable
| 0x4 * FragmentIndicatorCount (from [[#FragmentSet|FragmentSet]])
| [[#FragmentIndicator|FragmentIndicator]]
|}
= Digest =
{| class="wikitable" border="1"
|-
! Offset
! Size
! Description
|-
| 0x0
| 0x20
| Digest
|}
This is a SHA-256 hash always found at the end of the file. The hash is calculated over the CNMT file's contents, but this is only done for the development version of the file which results in its production version counterpart sharing the same hash value.
Retrieved from "https://switchbrew.org/wiki/CNMT"