Software / code / prosody
Changeset
1303:2170e2c0d57a
util.uuid: Now generates RFC 4122 complaint UUIDs (version 4 - random)
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Thu, 04 Jun 2009 18:04:26 +0500 |
| parents | 1302:4561c6d95339 |
| children | 1304:0a49759464e0 |
| files | util/uuid.lua |
| diffstat | 1 files changed, 15 insertions(+), 1 deletions(-) [+] |
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--- a/util/uuid.lua Thu Jun 04 17:41:55 2009 +0500 +++ b/util/uuid.lua Thu Jun 04 18:04:26 2009 +0500 @@ -27,8 +27,22 @@ return sha1(x..os_clock()..tostring({}), true); end +local buffer = new_random(uniq_time()); +local function get_nibbles(n) + if #buffer < n then + buffer = new_random(buffer..uniq_time()); + end + local r = buffer:sub(0, n); + buffer = buffer:sub(n+1); + return r; +end +local function get_twobits() + return ("%x"):format(get_nibbles(1):byte() % 4 + 8); +end + function generate() - return new_random(uniq_time()); + -- 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 return _M;
