CNMT
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This is the metadata file that ends in ".cnmt{.nca}" or "meta0.ncd". This seems to replace the TMD format.
There's at least 9 different filenames used for ".cnmt":
- "Application_{lower-case hex titleID}.cnmt"
- "Patch_{lower-case hex titleID}.cnmt"
- "AddOnContent_{lower-case hex titleID}.cnmt"
- "SystemUpdate_{hex titleID}.cnmt"
- "SystemData_{lower-case hex titleID}.cnmt"
- "SystemProgram_{lower-case hex titleID}.cnmt"
- "BootImagePackage_{lower-case hex titleID}.cnmt"
- "BootImagePackageSafe_{lower-case hex titleID}.cnmt"
- "Delta_{lower-case hex titleID}.cnmt"
Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Title ID |
| 0x8 | 0x4 | Version |
| 0xC | 0x1 | Meta Type |
| 0xD | 0x1 | Unused |
| 0xE | 0x2 | Extended Header Size |
| 0x10 | 0x2 | Content Count |
| 0x12 | 0x2 | Content Meta Count |
| 0x14 | 0x1 | Attributes (0=None, 1=IncludesExFatDriver, 2=Rebootless) |
| 0x15 | 0x3 | Unused |
| 0x18 | 0x4 | Required Download System Version |
| 0x1C | 0x4 | Unused |
SystemUpdate Extended Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x4 | Extended Header Size |
Application Extended Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Patch ID |
| 0x8 | 0x4 | Required System Version |
Patch Extended Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Application ID |
| 0x8 | 0x4 | Required System Version |
| 0xC | 0x4 | Extended Data Size |
| 0x10 | 0x8 | Unused |
AddOnContent Extended Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Application ID |
| 0x8 | 0x4 | Required Application Version |
| 0xC | 0x4 | Unused |
Delta Extended Header
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Application ID |
| 0x8 | 0x4 | Extended Data Size |
| 0xC | 0x4 | Unused |
Content records
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x20 | Hash |
| 0x20 | 0x10 | Content ID |
| 0x30 | 0x6 | Size |
| 0x36 | 0x1 | Title Type (0=Meta, 1=Program, 2=Data, 3=Control, 4=HtmlDocument, 5=LegalInformation, 6=DeltaFragment) |
| 0x37 | 0x1 | Id Offset |
Meta records
| Offset | Size | Description |
|---|---|---|
| 0x0 | 0x8 | Title ID |
| 0x8 | 0x4 | Version |
| 0xC | 0x1 | Meta Type |
| 0xD | 0x1 | Attributes (0=None, 1=IncludesExFatDriver, 2=Rebootless) |
| 0xE | 0x2 | Unused |
This is used for SystemUpdate, see here: NCM_services#ReadEntryMetaRecords.
Extended data
Patch-type cnmt files include an extended data section.
| 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:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 8 | Title ID |
| 0x8 | 4 | Title version |
| 0xC | 1 | Type (see 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:
| 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:
| 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:
| 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 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:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 16 | NcaId |
| 0x10 | 6 | Size |
| 0x16 | 1 | Type (see Title Types) |
| 0x17 | 1 |
This contains information on previous title content from earlier patches.