How to avoid running out of memory in high memory usage application? C / C++

Question

I have written a converter that takes openstreetmap xml files and converts them to a binary runtime rendering format that is typically about 10% of the original size. Input file

Answer 1

It sound like you are doing txt to binary conversation so why do you need to have the entire data in the memory?.
Can't you just read a primitive from txt (xml) then save to binarystream?