Add support for Godot 4 PCK files

[aaronfranke]

I tried to use this tool to extract a PCK file from a Godot 4 project on Linux, and I got an error that the version is unsupported:

$ ../install/bin/godotpcktool mirror-client.pck 
ERROR: pck is unsupported version: 2
ERROR: couldn't load pck file: mirror-client.pck

Please add support for extracting PCK files from Godot 4.

[nikitalita]

You can use GDRE tools as a reference for this: https://github.com/bruvzg/gdsdecomp/blob/master/utility/gdre_packed_source.cpp#L226

basically, in format version 2, they added a couple of additional fields to the header (changing the header length; they didn’t bother to use the reserved fields for some reason) and an additional flags field to every file entry.

they also added encryption support, which is here as well.

[hhyyrylainen]

At the latest I'll add support for this when Thrive is moving to Godot 4 (relevant issue for that: Revolutionary-Games/Thrive#2998).

[hhyyrylainen]

Does anyone have a Godot 4 .pck file to test with? A PR was just opened but Thrive is not on Godot 4 yet so I don't have a file to really verify things work.

[hhyyrylainen]

I just put out a new version of this tool that now supports reading Godot 4 .pck files: https://github.com/hhyyrylainen/GodotPckTool/releases/tag/v1.9