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util.uuid: Added function seed(string) to allow further seeding of the PRNG

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This commit is contained in:
Waqas Hussain 2009-06-04 19:55:56 +05:00
parent 4ee16e78eb
commit e60635aa94
1 changed files with 5 additions and 3 deletions
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8
util/uuid.lua
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@ -28,10 +28,11 @@ local function new_random(x)
end
local buffer = new_random(uniq_time());
local function _seed(x)
buffer = new_random(buffer..x);
end
local function get_nibbles(n)
if #buffer < n then
buffer = new_random(buffer..uniq_time());
end
if #buffer < n then seed(uniq_time()); end
local r = buffer:sub(0, n);
buffer = buffer:sub(n+1);
return r;
@ -44,5 +45,6 @@ function generate()
-- generate RFC 4122 complaint UUIDs (version 4 - random)
return get_nibbles(8).."-"..get_nibbles(4).."-4"..get_nibbles(3).."-"..(get_twobits())..get_nibbles(3).."-"..get_nibbles(12);
end
seed = _seed;
return _M;