I have a lua function that converts ip addresses to 32 bit int
local str = "127.0.0.1"
local o1,o2,o3,o4 = str:match("(%d%d?%d?)%.(%d%d?%d?)%.(%d%d?%d?)%.(%d%d?%d?)" )
local num = 2^24*o1 + 2^16*o2 + 2^8*o3 + o4
I would like to have the inverse function, i.e. get the 4 bytes from the int
You can use bit or bit32 libraries (included in Lua 5.2+ and LuaJIT and available as modules for 5.1). You can also use the reverse operations to what you already have:
print(math.floor(num / 2^24), math.floor((num % 2^24) / 2^16),
math.floor((num % 2^16) / 2^8), num % 2^8)
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