get file via tftp and write to filesystem, get length of tftp transfer

[Elmar Psilog]

Hello, is it possible to download a file via network (tftp) and write it
to a filesystem as ext4? This looks like a combination of
tftpboot and ext4write but how to get sizebytes?
I don't find how to get the length information from tftpboot into a
variable - it seems to me only displayed on screen. Did I miss something?
Thanks for you patience.
Elmar