I have done crazy stuff to compute the content length of some payloads. For context one of my client works in cloud stuff and I worked in converting hdd format

I have done crazy stuff to compute the content length of some payloads. For context one of my client works in cloud stuff and I worked in converting hdd format on the fly in a UI VM. The webserver that accepts the files doesn’t do chunked encoding. And there is no space to store the file. So I had to resort to passing over the input file once to transform it, compute its allocation table and transformed size, then throw away everything but the file and the table, restart the scan with the correct header and re-do the transformation.