PSP directory may have multiple sub directories

[orangecms]

From Steam Deck firmware, we can obtain the follow:

• one level 1 PSP directory that points to two further locations
• both locations each point to a PSP recovery directory

The current data structure has thus the following issues:

• only a single level 2 directory is supported for each legacy and modern PSP
• the range (offset + length) is decoupled from the directory itself; it should be part of the directory

Excerpts

PSP level 1 directory

00021000: 2450 5350 a100 4f07 0200 0000 0000 0000  $PSP..O.........
00021010: 4800 0000 0000 0000 0000 0600 0000 0000  H...............
00021020: 4a00 0000 0000 0000 0000 0700 0000 0000  J...............

These point to another location each.

PSP level 2 recovery directory A:

00060000: 0200 0000 0300 0000 ff00 0000 0000 0800  ................

PSP level 2 recovery directory B:

00070000: 0100 0000 0300 0000 ff00 0000 0000 8800  ................

Actual level 2 directories

00080000: 2450 4c32 36b1 638b 1a00 0000 0206 0040  $PL26.c........@
00080010: 0000 0000 4004 0000 0004 0000 0000 0080  ....@...........
00080020: 0100 0000 0022 0000 0009 0000 0000 0080  ....."..........
00080030: 7300 0000 80f6 0000 002b 0000 0000 0080  s........+......
00080040: 0200 0000 5043 0100 0022 0100 0000 0080  ....PC..."......
00080050: 0400 0000 0000 0200 0020 2600 0000 0080  ......... &.....
00080060: 0800 0000 0002 0400 0066 0200 0000 0080  .........f......
00080070: 0900 0000 4004 0000 0068 0600 0000 0080  ....@....h......

00880000: 2450 4c32 36b1 638b 1a00 0000 0206 0040  $PL26.c........@
00880010: 0000 0000 4004 0000 0004 0000 0000 0080  ....@...........
00880020: 0100 0000 0022 0000 0009 0000 0000 0080  ....."..........
00880030: 7300 0000 80f6 0000 002b 0000 0000 0080  s........+......
00880040: 0200 0000 5043 0100 0022 0100 0000 0080  ....PC..."......
00880050: 0400 0000 0000 0200 0020 2600 0000 0080  ......... &.....
00880060: 0800 0000 0002 0400 0066 0200 0000 0080  .........f......
00880070: 0900 0000 4004 0000 0068 0600 0000 0080  ....@....h......
00880080: 0b00 0000 ffff ffff 4100 0000 0000 0000  ........A.......