(DB) Detect Dolphin .gcz files

[Gooberpatrol66]

Expected behavior

[What you expected to happen]
.gcz files should be added to the library, as dolphin is able to play them

Actual behavior

[What is actually happening]
.gcz files are not added to the library

Steps to reproduce the bug

load content > collections > scan directory

Version/Commit

You can find this information under Information/System Information

• RetroArch: [version/commit]
  1.6.7

Environment information

• OS: [The operating system you're running]
  gentoo
• Compiler: [In case you are running local builds]
  gcc-7.3.0

[Sanaki]

Confirmed still valid on 1.7.8 using a gcz generated by the Dolphin standalone emulator. This complicates matters for me, since I was in the process of ripping all my GC games and expected to be able to limit the amount of space consumed by them.

EDIT: For now, I'm adding them to the database by scanning, then manually editing the database file to point to the gcz instead. Not optimal though.

[RobLoach]

Do you know of a publicly available database of .gcz files? Similar to redump.org ?

[Sanaki]

While I don't personally, I'm not sure that would help with this particular case. Assuming I understand correctly, it matches GC and Wii based on filename (seemingly hardcoded to .iso). There's no CRC32 or other checksum involved. It lists serial, but I'm not actually sure it checks that currently. Presumably just fixing the serial check would solve the problem if that's the case, assuming that's viable. That would bring it in line with how other formats, such as Playstation disc images, are handled.

[xTMODx]

@RobLoach here are the custom DATs for gcz and others https://dats.site/custom_system_datslist.php

[RobLoach]

Unsure scanning within archives works, but am interested in this.

[Sanaki]

Hmm... none of mine match that nkit gcz GC dat.

[RobLoach]

Don't think that .gcz files would kick the serial detection. Likely needs some RA updates. We could try it out once #10291 is in.

[xTMODx]

@Sanaki i think those were created from redump sources.

[Sanaki]

I'll have to look into it when I have more time. As I understand it, nkit has different options available in compression that may alter the final result. Mine are nkit scrubbed and then converted to gcz using dolphin standalone.

EDIT: Or to put it another way, yes, serial scanning sounds absolutely lovely.
EDIT2: Okay, it was my files at fault. That dat is good.