diff options
Diffstat (limited to 'util/uuid.lua')
| -rw-r--r-- | util/uuid.lua | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/util/uuid.lua b/util/uuid.lua index e928259d..a6dc0a1e 100644 --- a/util/uuid.lua +++ b/util/uuid.lua @@ -27,8 +27,22 @@ local function new_random(x) 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; |