Unrecognized file format on some converted ProTracker modules

[sdomi]

superfrog_fun-park.mod fails to load with xmp: superfrog_fun-park.mod: Unrecognized file format; adding -v doesn't show any more debug info at this stage, so I'm not quite sure how to go around debugging it further. File plays OK with libmodplug.

From the same game (and looking at the comment, likely from the same dump?), superfrog_project x.mod fails at xmp: superfrog_project x.mod: Error depacking file. Turns out that it's actually Amiga xpkf.library compressed data; libmodplug plays it, but with some sample artifacts (sounds like an endian swap along the way).

Some other files seemingly from the same dump play OK: superfrog_ice-world.mod, superfrog_level1.mod.

[AliceLR]

superfrog_fun-park.mod

Seems like this module is a victim of the safety checks when testing for the M.K. format; I will see what it takes to work around this. There is some junk in its pattern data that libxmp doesn't like.

superfrog_project x.mod

I've at least verified this one with the latest libxmp. Unsure of the cause, possibly an XPKF unsquash depacker bug or an XPKF compression that libxmp doesn't support yet. @sezero?

adding -v doesn't show any more debug info at this stage, so I'm not quite sure how to go around debugging it further.

Right now, to get debug output you have to rebuild libxmp from source after uncommenting the CFLAGS += -DDEBUG line in the Makefile.

[AliceLR]

superfrog_fun-park.mod

I suspect what's going on here is this is a bad rip (the ripper did not zero-initialize the MOD pattern before unpacking The Player data into it), but I've asked asle to verify. All of the pattern junk immediately follows D00 commands.

edit: here's the Modland rip of this module for comparison.

[sezero]

superfrog_project x.mod

I've at least verified this one with the latest libxmp. Unsure of the cause, possibly an XPKF unsquash depacker bug or an XPKF compression that libxmp doesn't support yet. @sezero?

Seems to hit lchk != sum in unsqsh() at line 333