This is a library to decompress .REL files with the SaCompGC header used in the Gamecube version of Sonic Adventure DX. The decompression code is based on a cleaned up Ghidra decompilation of the function used in the original game and is provided as-is.
The code can be compiled as either a program or a DLL. The command line program can be used as follows:
SACompGC InputFile.rel OutputFile.rel
Original decompilation and code by Exant64
Cleanup and x64 compatibility by hesoyaam