42 lines
905 B
Lua
42 lines
905 B
Lua
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local M = {}
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function M.hex(num, big)
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return string.format(big and "%02X" or "%02x", num)
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end
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function M.hexlify(s, big)
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local a = {}
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local format = big and "%02X" or "%02x"
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for i = 1, #s do
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a[i] = string.format(format, s[i])
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end
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return a
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end
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function M.unhexlify(s)
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if #s % 2 ~= 0 then
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error('unhexlify: hexstring must contain an even number of digits')
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end
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local a = {}
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for i = 1, #s, 2 do
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local byte = tonumber(s:sub(i, i+1), 16)
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if not byte then
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error(string.format("unhexlify: encountered non-hexadecimal number at position %d", i))
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end
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a[#a + 1] = byte
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end
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return a
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end
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function M.bin(num)
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local bin = ""
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while num > 0 do
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local rest = num % 2
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bin = tostring(rest) .. bin
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num = math.floor(num / 2)
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end
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return bin == "" and "0" or bin
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end
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return M
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