lzo compressed images in DS?

[neon]

1. There's no info, how to decompress .cso
I read source code, and now I know "ciso lzo 0 image.cso image.iso" is for decompressing.

2. It seems that it compress only with level 1. If I compress with level 9, I get the same file size like with level 1, or level 5.

I tested the some iso file with lzop compressor. And lzop gives different file size, with different compression level.

I don"t have Windows OS right now. Can you test (win32) ciso.exe with different compression level with this iso?
http://www.retroguru.com/sqrxz/sqrxz-v0996-dc.iso
Using Linux "ciso", always give me 1 443 370 bytes, when I compress this iso.

3. Why you skip zlib compression? It can by useful with homebrew software.

4. How big is lzo decompression module? Some commercial games don't work with compression. Some freeze in the beginning of gameplay.