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Handle getting out-of-bounds bits in get_bit (#574)

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The binary state is not padded with zeroes, so they must be inferred.
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Jude Melton-Houghton 2021-08-02 15:33:45 -04:00 committed by GitHub
parent db5879706d
commit e15c55c066
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1 changed files with 3 additions and 1 deletions
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mesecons/util.lua
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@ -164,7 +164,9 @@ end
function mesecon.get_bit(binary,bit) function mesecon.get_bit(binary,bit)
bit = bit or 1 bit = bit or 1
local c = binary:len()-(bit-1) local len = binary:len()
if bit > len then return false end
local c = len-(bit-1)
return binary:sub(c,c) == "1" return binary:sub(c,c) == "1"
end end