NCA with SparseInfo field

[proconsule]

Hi , i found out that some recent NCA (Base Game Program NCA) have SparseInfo field set, they failed to get parsed by hactool, giving Section read error.

Looking at that i found out that on Fs Header it gives "wrong offset" far beyond the file size (the PFS0 section) and also the roms gives wrong size on Level 5 IVFC.
I suspect that SparseInfo (that contain a BKTR magic) at offset 0x148 of fs Header for each section would inform of some math to get right offset for PFS0 and also for RomFS size.

Have you some info on this undocumented Sparse Info field?
Thanks

[R-YaTian]

SparseInfo should already documented on Atmosphere - fssystem_nca_header.hpp
And I found that Base NSP of 'last stop' don't have PFS0 section actually.

[proconsule]

thanks for the info on that, i will check it

At offset 0x3D418F23 of program nca(decrypted) there is a PFS0 magic maybe isn't a real one, i'll have to check.