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This document is about the format of CTR cart images (CCI), which is also the format of 3DS ROM dumps.
See also: [[NCSD]].
 
This page documents the format of NCSD. CTR cart images (CCI) is NCSD, but is used for other things as well. CSU is NCSD used for system updates and development tools.
 
This is a container format which generally holds [[CXI]] files inside.


=== Overview ===
=== Overview ===
CCI files start with a NCSD header, followed by 3 NCCH blocks. The first block usually starts at 0x4000. While it is unknown what each NCCH block is for, the first one is most likely the main program code since it is much bigger than the others.
NCSD images start with a NCSD header, followed by up to a maximum of 8 partitions according to spec. The first partition(NCCH 0) usually starts at 0x4000, this is generally the main NCCH executable. The following info on partitions 1, 2, and 7 are only valid for .CCI. The second partition(NCCH 1) contains the game "Manual"(title ID for the .CXI containing the Manual always starts with '0005'). The third partition(NCCH 2) contains the download play "Child"(The title ID for the NCCH containing the Child always starts with '0006'). The eighth block(NCCH 7) contains "Update Data"(The title ID for the NCCH containing the Update Data always starts with '8000') The format of partitions can be determined from the partition FS flags, while the contents can be determined from the partitions flags.
 
The NCCH blocks are in the same format as [[CXI]] files.


=== NCSD header ===
=== NCSD header ===
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
!  OFFSET
!  Offset
!  SIZE
!  Size
!  DESCRIPTION
!  Description
|-
|-
|  0x000
|  0x000
|  0x100
|  0x100
|  RSA-2048 signature of the NCSD header, using SHA-256 (needs to be confirmed)
|  RSA-2048 SHA-256 signature of the NCSD header
|-
|-
|  0x100
|  0x100
|  4
|  4
|  Magic ID, always 'NCSD'
|  Magic Number 'NCSD'
|-
|-
|  0x104
|  0x104
|  4
|  4
|  Size of the CCI image, in media units (1 media unit = 0x200 bytes)
|  Size of the NCSD image, in media units (1 media unit = 0x200 bytes)
|-
|-
|  0x108
|  0x108
Line 29: Line 31:
|  Title/Program ID
|  Title/Program ID
|-
|-
|  0x120
|  0x110
|  4
|  8
|  Offset to the first NCCH in media units
|  Partitions FS type
|-
|-
|  0x124
|  0x118
|  4
|  8
|  Size of the first NCCH
|  Partitions crypt type
|-
|-
|  0x130
|  0x120
|  4
|  0x40=(4+4)*8
|  Offset to the second NCCH
|  Offset & Length partition table
|-
|-
|  0x134
|  0x160
|  4
|  0x20
|  Size of the second NCCH
|  Exheader SHA-256 hash
|-
|-
|  0x158
|  0x180
|  4
|  0x4
|  Offset to the third NCCH
|  Additional header size
|-
|-
|  0x15C
|  0x184
|  4
|  0x4
|  Size of the third NCCH
|  Sector zero offset
|-
|-
|  0x18C
|  0x188
|  4
|  8
|  Unknown (always 0x00000101)
|  Partition Flags: byte[5]-byte[7] indicate content type ( system update, application, manual, ... ) size of media units ( 512*2^byte[6] ) and encryption.
|-
|-
|  0x190
|  0x190
|  8
|  0x40=8*8
|  Partition ID of the first NCCH
|  Partitions' Title ID table
|-
|-
|  0x1A0
|  0x1D0
|  8
|  0x28
|  Partition ID of the second NCCH
|  Reserved
|-
|-
|  0x1C8
|  0x1F8
|  8
|  8
|  Partition ID of the third NCCH
|  Unknown
|-
|-
|  0x200
|  0x200
|  4
|  4
|  Always 0xFFFFFFFF
|  Always 0xFFFFFFFF
|-
|  0x204
|  252
|  Padding?
|-
|-
|  0x300
|  0x300
|  4
|  4
|  Used ROM size in bytes
|  Used ROM size in bytes
|-
|  0x304
|  28
|  Padding
|-
|-
|  0x320
|  0x320
|  16
|  8
|  Unknown
|  [[NVer]] Title ID (Only Present in retail .CCI)
|-
|  0x328
|  8
|  [[NVer]] Title Version (Only Present in retail .CCI)
|}
|}


Parts of the first NCCH block's header are found around 0x1000 for whatever reason.
Parts of the first NCCH block's header are found around 0x1000 for whatever reason. NCSD can hold up to 8 partitions. (i.e. Mario Kart 7 holds 4 NCCHs, most we've seen so far)
 
The region-specific NVer title for this NCSD presumably must exist on NAND. The NVer title version may also be used to check whether a system update is required before running the app.


CCI images may not include all three NCCH blocks. For example, Ghost Recon: Shadow Wars lacks the second NCCH. Entries at 0x130, 0x134 and 0x1A0 in its NCSD header are zero.
[[Category:File formats]]
Retrieved from "https://www.3dbrew.org/wiki/CCI"