function ChanceFromStep(randItem, step)
    local uVar1 = 0
	local uVar2 = 0
	local uVar3 = 0
	local temp = 0
	local temp2 = 0
	local temp3 = 0
	local temp4 = 0

	uVar3 = 1

	if step == 0 then
	   return 0
	end

	if step < 0 then
	  step = math.abs(step)
	end

	uVar1 = randItem
	if randItem < 0 then
	    uVar1 = math.abs(randItem)
	end


	if step <= uVar1 then
	   while step <  0x10000000 and step < uVar1 do
	            step = bit.lshift(step, 0x4)
				uVar3 = bit.lshift(uVar3, 0x4)
	   end



	   while step < 0x80000000 and step < uVar1 do
	             step = bit.lshift(step, 0x1)
				 uVar3 = bit.lshift(uVar3, 0x1)
	   end



	   while true do
	        uVar2 = 0
			if step <= uVar1 then
			   uVar1 = uVar1 - step
			end



			if bit.rshift(step, 0x1) <= uVar1 then
			    uVar1 = uVar1 - bit.rshift(step, 0x1)


				temp =  bit.rshift(uVar3, 0x1)
				temp2 = bit.lshift(uVar3, 0x1f)

				uVar2 =  bit.bor(temp, temp2)
			end

			if bit.rshift(step, 0x2) <= uVar1 then

			    uVar1 = uVar1 - bit.rshift(step, 0x2)


				temp = bit.rshift(uVar3, 0x2)
				temp2 = bit.lshift(uVar3, 0x1e)

				temp3 = bit.bor(uVar2,  temp)
				temp3 = bit.bor(temp3, temp2)

				uVar2 = temp3
			end

			if bit.rshift(step, 0x3) <= uVar1 then

			   uVar1 = uVar1 - bit.rshift(step, 0x3)

			   temp = bit.lshift(uVar3, 0x1d)

			   uVar2 = bit.bor(uVar2, temp)

			end

			if uVar1 == 0 or bit.rshift(uVar3, 0x4) == 0 then
			    break
			end

			step = bit.rshift(step, 0x4)
			uVar3 = bit.rshift(uVar3, 0x4)

	   end


		 -- stop @ PAK SRAM
		 uVar2 = bit.band(uVar2, 0xe0000000)

         -- wasn't cleanly divisible, add back up until we are
		 if uVar2 ~= 0 then

			if bit.band(bit.lshift(uVar3, 0x1d), uVar2) ~= 0 then
			   uVar1 = uVar1 + bit.rshift(step, 0x3)
			end

			temp3 = bit.lshift(uVar3, 0x1e)
			temp4 = bit.rshift(uVar3, 0x2)

			temp2 = bit.bor(temp4, temp3)

			if bit.band(uVar2, temp2) ~= 0 then
			   uVar1 = uVar1 + bit.rshift(step, 0x2)
			end

			temp3 = bit.lshift(uVar3, 0x1f)
			temp4 = bit.rshift(uVar3, 0x2)

			temp2 = bit.bor(temp4, temp3)

			if bit.band(uVar2, temp2) ~= 0 then
			   uVar1 = uVar1 + bit.rshift(step, 0x1)
			end

		 end

	end


	if randItem < 0 then
	   uVar1 = -uVar1
	end

	return  uVar1
end