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I realized that I can emulate stream access in a compiler without it using a direct access file of characters.
Are there any pitfalls or portability issues I should be aware of?
My program seems to work OK.
I found that direct access files are indeed sometimes used for this purpose. The example is library binstreams in FLIBS. The issues that comes with this approach are described there as well under implementation notes. This approach can be handy, because there sometimes not the newest compilers available on every HPC computer.