AutoScale

Automatically scales a number of bytes with an optional number of decimal places. Returns a second string value of the scale suffix. More information.

function AutoScale(num, idp)
	assert(tonumber(num), 'AutoScale expects a number.')
	local scales = {'B', 'kB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'}
	local places = idp or 0
	local scale = ""
	local scaled = 0

	for i, v in ipairs(scales) do
		if (num < (1024 ^ i)) or (i == #scales) then
			scale = v
			scaled = Round(num / 1024 ^ (i - 1), places)
			break
		end
	end

	return scaled, scale
end

function Round(num, idp)
	assert(tonumber(num), 'Round expects a number.')
	local mult = 10 ^ (idp or 0)
	if num >= 0 then
		return math.floor(num * mult + 0.5) / mult
	else
		return math.ceil(num * mult - 0.5) / mult
	end
end