Editing PUP

PUP files are update archives for the Vita. 

== PUP Header ==
A good resource on the PUP header can be found [http://www.vitadevwiki.com/index.php?title=Playstation_Update_Package_(PUP) here].
=== Filename IDs ===
It is a mistake to try to connect a file entry ID to any specific file. A better way of organizing the update contents is through the extracted [[SCE]] encrypted file header. Nevertheless, there are certain file entry IDs that have been linked with the same data throughout all observed update packages.
{| class="wikitable sortable"
|-
! File Entry ID !! Description
|-
| 0x100 || Version string
|-
| 0x101 || License XML
|-
| 0x200 || <code>psp2swu.self</code>, main [[Updater|updater]]
|-
| 0x204 || <code>cui_setupper.self</code>, development [[Updater|updater]] initializer
|-
| 0x400 || Watermark. Same ID for retail PUPs. Different IDs for dev PUPs for each developer.
|-
| 0x401 || Unknown SCEAS magic file
|-
| 0x2005 || CP firmware in early debug updates only
|-
| 0x2006 || CP firmware in debug updates only
|-
|}

== Package Headers ==
Most of the files in the update PUP are [[SCE]] encrypted. Each component of the update is broken up into multiple parts, then optionally compressed, and finally encrypted into the SCE file. Right after the SCE header (usually offset 0x400) is the update package header that provides information for piecing the component back together. The contents of this header is as follows:
{| class="wikitable sortable"
|-
! Offset !! Size !! Description
|-
| 0x0 || 0x4 || Version (0x4)
|-
| 0x4 || 0x4 || [[PUP#Type ID|Type ID]]
|-
| 0x8 || 0x4 || [[PUP#Flags|Flags]]
|-
| 0xC || 0x4 || ?
|-
| 0x10 || 0x8 || Update FW Version
|-
| 0x18 || 0x8 || Final (decompressed) size
|-
| 0x20 || 0x8 || Decrypted size
|-
| 0x28 || 0x8 || ?
|-
| 0x30 || 0x4 || ?
|-
| 0x34 || 0x4 || ?
|-
| 0x38 || 0xC || ?
|-
| 0x3C || 0x4 || ?
|-
| 0x40 || 0x8 || ?
|-
| 0x48 || 0x8 || ?
|-
| 0x50 || 0x8 || Offset
|-
| 0x58 || 0x8 || Size
|-
| 0x60 || 0x8 || Part Index
|-
| 0x68 || 0x8 || Total Parts
|-
| 0x70 || 0x8 || ?
|-
| 0x78 || 0x8 || ?
|-
|}
=== Flags ===
There are flags that are set in the package header. Some potential ones are listed here.
{| class="wikitable"
|-
! Flag !! Description
|-
| 0x10 || Set when compressed
|-
| 0x2 || Has multiple parts
|-
| 0x1 || Set when compressed
|-
|}

=== Type ID ===
The type id determines which decryption routine to use in [[SceSblSsUpdateMgr]]. There is a truth table to determine which id can be handled by which decryption function. To see how this table is used, check out the [[Updater#Update Package Decryption|example code]] for decrypting packages.
{| class="wikitable"
|-
! Type ID !! Func 1? !! Func 2? !! Func 3?
|-
| 0x0 || No || No || No
|-
| 0x1 || Yes || Yes || No
|-
| 0x2 || No || No || No
|-
| 0x3 || No || No || Yes
|-
| 0x4 || No || No || Yes
|-
| 0x5 || No || No || No
|-
| 0x6 || No || No || No
|-
| 0x7 || No || No || No
|-
| 0x8 || Yes || Yes || No
|-
| 0x9 || Yes || Yes || No
|-
| 0xA || Yes || Yes || Yes
|-
| 0xB || Yes || Yes || No
|-
| 0xC || Yes || Yes || No
|-
| 0xD || Yes || Yes || No
|-
| 0xE || No || No || No
|-
| 0xF || Yes || Yes || No
|-
| 0x10 || Yes || Yes || No
|-
| 0x11 || Yes || Yes || No
|-
| 0x12 || Yes || Yes || No
|-
| 0x13 || Yes || Yes || No
|-
| 0x14 || Yes || Yes || No
|-
| 0x15 || Yes || Yes || Yes
|-
| 0x16 || Yes || Yes || Yes
|-
| 0x17 || Yes || Yes || Yes
|-
| 0x18 || Yes || Yes || No
|-
| 0x19 || Yes || Yes || No
|-
| 0x1A || No || No || No
|-
| 0x1B || No || No || Yes
|} 

=== Type ID (Identifier) ===
The type ID is also used to identify the component of the update.
{| class="wikitable"
|-
! Type ID !! Note
|-
| 0x0 || 
|-
| 0x1 || <code>os0</code> [[Partitions|partition]]
|-
| 0x2 || 
|-
| 0x3 || 
|-
| 0x4 || Permissions related to TAR archives of type 0x16
|-
| 0x5 || 
|-
| 0x6 || 
|-
| 0x7 || 
|-
| 0x8 || [[Syscon Update]] (0x9A54 type)
|-
| 0x9 || [[SLB2]] [[Boot Sequence|bootloaders]]
|-
| 0xA || <code>vs0</code> [[Partitions|partition]]
|-
| 0xB || Development CP firmware (same file as PUP entry 0x2006)
|-
| 0xC || Motion related
|-
| 0xD || Bbmc related
|-
| 0xE || 
|-
| 0xF || Motion related
|-
| 0x10 || Touch/Syscon related
|-
| 0x11 || Touch related
|-
| 0x12 || Syscon related
|-
| 0x13 || Syscon related
|-
| 0x14 || [[Syscon Update]] (0x3665 type)
|-
| 0x15 || 
|-
| 0x16 || TAR archive, patch update for <code>vs0</code>
|-
| 0x17 || <code>sa0</code> [[Partitions|partition]]
|-
| 0x18 || <code>pd0</code> [[Partitions|partition]]
|-
| 0x19 || [[Syscon Update]] (0xC5E7 type)
|-
| 0x1A || 
|-
| 0x1B || [[PSP Emulator]] lists
|}

=== PUP Update Contents ===
Each PUP contain updates for different partitions of the system. Most packages, once decrypted, decompressed, and pieced together are an raw disk image for the partition to update. Sometimes a TAR archive patch is also used along with the disk images but not as often. Sony usually releases three kinds of update files, each to update different components.
==== full ====
This contains the actual system files. The main components are <code>os0</code>, <code>vs0</code>, and the [[Boot Sequence|bootloader partition]].
==== systemdata ====
Systemdata PUPs only update the <code>sa0</code> [[Partitions|partition]]. It is likely separated from the main update due to it not regularly needing updates and size concerns.
==== preinst ====
Preinst PUPs only update the <code>pd0</code> [[Partitions|partition]]. This is the [[Welcome Park]] application and the initial setup movie. It is likely separated from the main update because of the size.
==== Debug ====
Debug updates for [[PTEL-XXXX]] and [[PDEL-XXXX]] do not separate into three different PUPs. A single PUP will update all components. Additionally updates for PDEL units contains updates for the CP and probably other development unit specific components.