I've also never seen that code but it's very readable for me, just based on the snippet. It's supposed to encode the information tuple and store it as the next

I've also never seen that code but it's very readable for me, just based on the snippet. It's supposed to encode the information tuple and store it as the next entry of variable length on the position pointed by q. Every tuple ends with the 32-bit literal, but what comes before depends on the size of the displacement, and of course, smaller displacements need less bytes.