PSISOIMG0000

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)

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 (and maybe to decrypt 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

set search "\xE8\x7F\x01\x80\xE9\x61\x00\x00\xE8\x0B\x00\x10\x7C\x08\x03\xA6"
set replace "\x38\x60\x00\x00"

catch_die {:: patch_elf $elf $search 0 $replace} "Unable to patch self [file tail $elf]"

• tested manually (without mfw creator)

Structure

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

Entry Nº	Offset	Length	Name	Example	Notes
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
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: [[1]]