Functional parity with squashfs-tools

I'm not sure if I should create this issue, as it's more of a help and advice thing I am currently using Chimera Linux and my idea is to use a small script to get AppImage working. In a nutshell AppImage is ELF-Header + Squashfs Since AppImage relies on Glibc, to unpack it, you need to calculate the size of the ELF header and unpack it using unsquashfs -o as shown in this script: https://github.com/Phantop/appdwarf/blob/main/appdwarf#L34 Is it possible to do this and if so, how with `rdsquashfs` or `sqfs2tar` I'm counting on all the help I can get, Dr.Sheppard