Editing PSISOIMG0000

[[Category:Software]]
This format is used for PSONE Classics on PS3 and PSP.

== EBOOT.PBP ==
Contents:
* [[PARAM.SFO]]
* ICON0.PNG
* ICON1.PMF
* PIC0.PNG
* PIC1.PNG
* SND0.AT3
* DATA.PSP
* DATA.PSAR

== DATA.PSAR ==
* Contains the ISO (usually compressed) 
{| class="wikitable"
|-
! Offset !! Notes
|-
| 0x0 || PSISOIMG0000
|-
| 0x400 || iso header (encrypted, probably ignored by ps1_netemu)
|-
| 0x1220 || special data (encrypted)
|-
| 0x100000 || start of the iso
|-
|}

==ISO.BIN==
This file helps the PS3 to verify the content of DATA.PSAR. It is a copy of the iso header. At the end of the file, there is a signature which can be used to verify the contents.
All offsets are in little endian.

====Patch for disabling the signature check in ps1_netemu====
<code>set search "\xE8\x7F\x01\x80\xE9\x61\x00\x00\xE8\x0B\x00\x10\x7C\x08\x03\xA6"<br />
set replace "\x38\x60\x00\x00"<br />
<br />
catch_die {:: patch_elf $elf $search 0 $replace} "Unable to patch self [file tail $elf]"
</code>
* tested manually (without mfw creator)

=== Structure ===
{| class="wikitable"
|-
! Offset !! Notes
|-
| 0x0 || PSISOIMG0000
|-
| 0x400 || iso header (decrypted)
|-
| 0x4000 || start of entries
|-
|}

=== Entries ===
* Starting at 0x4000 
* Each entry represents 0x10 Sectors of the iso
* One sector has 0x930 bytes (2352 bytes)
* Sectors are compressed
* same entries can be found in the decrypted iso_header of the EBOOT.PBP

{| class="wikitable"
|-
! Entry Nº !! Offset !! Length !! Name !! Example !! Notes
|-
| rowspan="5" style="background-color:#DDDDDD;" | 1 || 0x00 || 4 bytes (0x04) || '''offset in iso''' || 0 || offset relative to start of the iso inside of DATA.PSAR
|-
| 0x04 || 2 bytes (0x02) || '''size''' || variable || size of 0x10 sectors (compressed, if not 0x9300)
|-
| 0x06 || 2 bytes (0x02) || '''type ?''' || 01 00 || usually 1... and 0 for the last entry
|-
| 0x08 || 16 bytes (0x10) || '''sha1''' || variable || first 0x10 bytes of sha1 sum of 0x10 disc sectors
|-
| 0x18 || 8 bytes (0x08) || ''padding'' || ||
|-
| style="background-color:#DDDDDD;" | Up to 32256 || || || || || same structure than the previous entry
|-
|}

== Extract ISOs ==
you can use this app to get plain isos out of the eboot.pbp: [[http://www.multiupload.nl/QAHNB0VQZW]]