Looking for that right now, trying to find out how to see which version this guy used. One sec, sorry.
Okay got this from the source - 1.7.10
There's the getSize method on the filestore: http://reference.elgg.org/1.7/classElggDiskFilestore.html#a36a715846883c6f94937dbd6ec9e0206
I'm not sure how that is done via exec - that doesn't sound like core code, it's probably a custom plugin?
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