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1b1ed1a
(Get the code!)
As far as
"I'm not sure if mapped reading even makes sense in cases where the file is only being read sequentially through once (maybe things were different back in the days when the code was written?)."
One possible explanation is that all of those mechanisms appeared no earlier than 2000 or 2001, and would have taken a while to spread enough to rely on in the early years of DC++, while mmap() was available since the earliest widely used versions of Linux.