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=== Overview ===
=== Overview ===
CIA stands for '''C'''TR '''I'''mportable '''A'''rchieve. These files contain a compiled application which can be installed on CTR NAND, TWL NAND (part of the NAND used by DSi applications) and on the SD card. CIA files can be created with the Nintendo 3DS SDK and installed on the 3DS test units by the Dev channel.
CIA stands for '''C'''TR '''I'''mportable '''A'''rchive. These files contain a compiled application which can be installed on CTR NAND, TWL NAND (part of the NAND used by DSi applications) and on the SD card. CIA files can be created with the Nintendo 3DS SDK and installed on the 3DS test units by the Dev channel.
=== Format ===
=== Format ===
The file is represented in little-endian.
The file is represented in little-endian.
== CIA Header ==
== CIA Header ==
This is a 32 bytes long header (8 x uint32).
{| class="wikitable" border="1"
{| class="wikitable" border="1"
|-
|-
! START
! START
! SIZE
! SIZE
! DESCRIPTION
! DESCRIPTION
|-
|-
| 0x00
| 0x00
| 0x04
| 0x04
| constant header size = 0x2020 bytes
| Archive Header Size (=0x2020 bytes) (Starts with 0x80 @ offset 0x0020)
|-
|-
| 0x04
| 0x04
| 0x04
| 0x04
| Reserved = 0
| Reserved = 0
|-
|-
| 0x08
| 0x08
| 0x04
| 0x04
| Certificate chain size
| Certificate chain size
|-
|-
| 0x0C
| 0x0C
| 0x04
| 0x04
| unknown (Ticket size?)
| unknown (Ticket size?)
|-
|-
| 0x10
| 0x10
| 0x04
| 0x04
| TMD file size
| TMD file size
|-
|-
| 0x14
| 0x14
| 0x04
| 0x04
| Banner size (0 if no banner)
| Banner size (0 if no banner)
|-
|-
| 0x18
| 0x18
| 0x18
| 0x04
| 0 (reserved, flag?)
| 0 (reserved, flag?)
|-
|-
| 0x1C
| 0x1C
| 0x04
| 0x04
| APP file size
| APP file size
|}
|}
The order of the sections in the header also is the order of them in the CIA file:
The order of the sections in the header also is the order of them in the CIA file: