How to calculate the size of an elf file?

Question

linux

Good afternoon.
There are a lot of glued files into one big one, among this set there are elf files. We know where they start, but we don't know where they end.
Question: how to calculate the size of an elf file knowing the title?
elf32 file format

Answer 1

https://ru.wikipedia.org/wiki/Executable_and_Linka...
Take the book "Lunix ELF Executable File Format" by Alexander Fisun and study the header structure, knowing the structure, you can make a counting algorithm.

Answer 2

We know where they start, but we don't know where they end.

It is quite logical that they end where the next begins.
Look for the signature of the beginning of the elf file, and from this place iterate over looking for matches with the initial signatures of the rest of the files.