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This document is about the format of CTR cart images (CCI), which is also the format of 3DS ROM dumps.

This document is about the format of CTR cart images (CCI), which is also the format of 3DS ROM dumps.

=== Overview ===

=== Overview ===

CCI files start with a NCSD header, followed by up to a maximum of 8 NCCH blocks according to spec. The first block usually starts at 0x4000. In most carts the first block contains game code/data, the second block contains the download play "child" and the third block contains potential system updates. The exact contents of NCCH blocks can be determined by looking at the flags.

CCI files start with a NCSD header, followed by up to a maximum of 13 NCCH blocks according to spec. The first block usually starts at 0x4000. In most carts the first block contains game code/data, the second block contains the download play "child" and the third block contains potential system updates. The exact contents of NCCH blocks can be determined by looking at the flags.

 

The NCCH blocks are in the same format as [[CXI]] files.

=== NCSD header ===

=== NCSD header ===

|  8

|  8

|  Title/Program ID

|  Title/Program ID

|-

|-

|  0x120

|  0x120

|  4

|  0x68=(4+4)*13

|  Offset & Length CXI table

|  4

|  Offset to the second NCCH

|-

|-

|  0x188

|  0x188

|  8

|  8

|  NCCH Flags: byte[5]-byte[7] indicate content type ( system update, application, manual, ... ) size of media units ( 512*2^byte[6] ) and encryption.

|  CXI 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

|  0x68=8*13

|  Partition ID of the first NCCH

|  CXI's Title ID table

|-

|-

|  0x1C8

|  0x1F8

|  8

|  8

|  Partition ID of the third NCCH

|  Unknown

|-

|-

|  0x200

|  0x200

|  4

|  4

|  Always 0xFFFFFFFF

|  Always 0xFFFFFFFF

|-

|-

|  0x300

|  0x300

|  4

|  4

|  Used ROM size in bytes

|  Used ROM size in bytes

|-

|-

|  0x320

|  0x320

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.

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.

CCI can hold up to 13 CXI (i.e. Mario Kart 7 holds 4 CXIs, most we've seen so far)

 

 

The 3 CXIs appear in some order.

 

if you take offset 0x120 and look at it as a table of {uint32 offset, uint32 length} it might be the CXI table

 

 

Each CXI's information is on the same index on both tables...

In this method of reading CCIs can hold up to 13 CXIs.

CSU files are basicaly CCI files.