swarm intelligence question "Store binary data as string in a c/al code line and read it back"

Hi NAV folks

I know there is a way to store any binary data as a text string in a code line and read it out.
Unfortunately I don't fully remember it anymore.
Aim is to deliver the binary data of a picture inside of a nav object rather then deliver them in an extra bmp.
So it should be possible to..
1. convert a blob binary data to string data characters.
2. create code lines from with the string data.
3. build a reader which later read out the binary data form the string and create a blob.

Can someone help?