Difference between revisions of "CNMT"
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Revision as of 19:48, 30 September 2018
For the content of the NCA FS which can be mounted, see here.
For the format of the actual NCA, see here.
Contents
Metadata file
This is the file that ends in ".cnmt{.nca}" or "meta0.ncd". This seems to replace the TMD format.
There's at least 7 different filenames used for ".cnmt":
- "Application_{lower-case hex titleID}.cnmt"
- "Patch_{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"
It starts with a header:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 8 | Title ID |
| 0x8 | 4 | u32 title-version |
| 0xC | 1 | Type (see Title Types) |
| 0xD | 1 | |
| 0xE | 2 | Offset to table relative to the end of this 0x20-byte header. |
| 0x10 | 2 | Number of content entries |
| 0x12 | 2 | Number of meta entries |
| 0x14 | 12 |
With SystemUpdate, the 4-bytes at offset 0xE are zero, with the entry-count field located at offset 0x12 instead(header size is the same).
An optional header can follow, depending on the title type.
At the end of the file following the entries is a 0x20-byte block, presumably a hash.
With Patch-format, there's additional data after the end of the entries specified in the header and before the ending hash.
Application header
| Offset | Size | Description |
|---|---|---|
| 0x20 | 8 | Patch Title ID |
| 0x28 | 8 | Minimum system version |
Patch header
| Offset | Size | Description |
|---|---|---|
| 0x20 | 8 | Original title ID |
| 0x28 | 8 | Minimum system version |
Add-on content header
| Offset | Size | Description |
|---|---|---|
| 0x20 | 8 | Application title ID |
| 0x28 | 8 | Minimum application version |
Content records
Each entry is 0x38 bytes:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 32 | Hash |
| 0x20 | 16 | NcaId [same as first 16-bytes of hash] |
| 0x30 | 6 | Size, same as the output from Content_Manager_services#GetEntrySize. |
| 0x36 | 1 | Type (0=meta, 1=program, 2=data, 3=control, 4=offline-manual html, 5=legal html, 6=game-update RomFS patches?) |
| 0x37 | 1 |
Meta records
Each entry is 0x10 bytes:
| Offset | Size | Description |
|---|---|---|
| 0x0 | 8 | Title ID |
| 0x8 | 4 | Title version |
| 0xC | 1 | Type (see Title Types) |
| 0xD | 1 | ? bit0 set = don't install? |
| 0xE | 2 | Unused? |
This is used for SystemUpdate, see here: Content_Manager_services#GetUpdateTitleList.
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.
