...So far, the project is dormant, but the realization is a straightforward task using two existing SourceForge projects:
1) Clone the ZLib-Ada thick binding project.
2) Replace the functions having Import pragma in Zlib.Thin (zlib-thin.ads) by native ones. For compression and decompression, just help yourself with the code in Zip.Compress.Deflate and UnZip.Decompress from the Zip-Ada project.
This way you get a full-Ada and compatible version of ZLib-Ada.
If there is a real interest in Zada, contact us.