140 lines
2.1 KiB
Lua
140 lines
2.1 KiB
Lua
-- These are super slow 32-bit operations --
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local two31 = 2^31
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local two32 = 2^32
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local to_binary = function(x)
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local pos = two31
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local a = ""
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if x < 0 then
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x = x + two32
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end
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x = x % two32
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for i=1,32 do
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if x >= pos then
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a = a .. "1"
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x = x - pos
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else
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a = a .. "0"
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end
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pos = pos / 2
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end
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return a
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end
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local from_binary = function(x)
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local z = tonumber(x)
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if z >= two31 then
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return z - two32
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else
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return z
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end
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end
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local band = function(...)
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local a = {}
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local arg = {...}
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for i = 1,#arg do
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a[i] = to_binary(arg[i])
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end
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local c = ""
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for i = 1,32 do
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local value = true
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for j = 1,#arg do
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if a[j]:sub(i,i) == "0" then
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value = false
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break
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end
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end
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if value then
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c = c .. "1"
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else
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c = c .. "0"
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end
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end
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return from_binary(c)
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end
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local bor = function(...)
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local a = {}
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local arg = {...}
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for i = 1,#arg do
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a[i] = to_binary(arg[i])
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end
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local c = ""
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for i = 1,32 do
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local value = false
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for j = 1,#arg do
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if a[j]:sub(i,i) == "1" then
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value = true
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break
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end
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end
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if value then
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c = c .. "1"
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else
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c = c .. "0"
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end
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end
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return from_binary(c)
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end
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local bxor = function(...)
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local a = {}
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local arg = {...}
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for i = 1,#arg do
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a[i] = to_binary(arg[i])
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end
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local c = ""
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for i = 1,32 do
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local value = false
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for j = 1,#arg do
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if a[j]:sub(i,i) == "1" then
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value = not value
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end
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end
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if value then
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c = c .. "1"
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else
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c = c .. "0"
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end
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end
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return from_binary(c)
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end
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local bnot = function(x)
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local a = to_binary(x)
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local c = ""
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for i = 1,32 do
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if a:sub(i,i) == "0" then
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c = c .. "1"
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else
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c = c .. "0"
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end
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end
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return from_binary(c)
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end
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local lshift = function(x,n)
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return (x * 2^n) % two32
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end
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local rshift = function(x,n)
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return math.floor(x / 2^n)
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end
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local rol = function(x,n)
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local a = to_binary(x)
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for i = 1,n do
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a = a:sub(2,32) .. a:sub(1,1)
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end
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return from_binary(a)
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end
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return {rol=rol, bxor=bxor, bor=bor, band=band, bnot=bnot, lshift=lshift, rshift=rshift}
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