24 lines
898 B
Lua
24 lines
898 B
Lua
-- A simple UUID function based on RFC 4122: http://www.ietf.org/rfc/rfc4122.txt
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local function uuid()
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local r = math.random
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-- Set all the other bits to randomly (or pseudo-randomly) chosen values.
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local bytes = {
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r(2^(4*8)), --time-low
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r(2^(2*8)), --time-mid
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r(2^(2*8-4)), --time-high-and-version
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r(2^(1*8-2)), --clock-seq-and-reserved
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r(2^(1*8)), --clock-seq-low
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r(2^(3*8)), r(2^(3*8)), --node
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}
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-- Set the four most significant bits (bits 12 through 15) of the
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-- time_hi_and_version field to the 4-bit version number from
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-- Section 4.1.3.
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bytes[3] = bytes[3] + 0x4000
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-- Set the two most significant bits (bits 6 and 7) of the
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-- clock_seq_hi_and_reserved to zero and one, respectively.
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bytes[4] = bytes[4] + 0xC0
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return ("%08x-%04x-%04x-%02x%02x-%6x%6x"):format(unpack(bytes))
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end
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return uuid
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