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+// Unique ID creation requires a high quality random # generator. We feature
+// detect to determine the best RNG source, normalizing to a function that
+// returns 128-bits of randomness, since that's what's usually required
+var rng = require('./lib/rng');
+var bytesToUuid = require('./lib/bytesToUuid');
+
+// **`v1()` - Generate time-based UUID**
+//
+// Inspired by https://github.com/LiosK/UUID.js
+// and http://docs.python.org/library/uuid.html
+
+// random #'s we need to init node and clockseq
+var _seedBytes = rng();
+
+// Per 4.5, create and 48-bit node id, (47 random bits + multicast bit = 1)
+var _nodeId = [
+ _seedBytes[0] | 0x01,
+ _seedBytes[1], _seedBytes[2], _seedBytes[3], _seedBytes[4], _seedBytes[5]
+];
+
+// Per 4.2.2, randomize (14 bit) clockseq
+var _clockseq = (_seedBytes[6] << 8 | _seedBytes[7]) & 0x3fff;
+
+// Previous uuid creation time
+var _lastMSecs = 0, _lastNSecs = 0;
+
+// See https://github.com/broofa/node-uuid for API details
+function v1(options, buf, offset) {
+ var i = buf && offset || 0;
+ var b = buf || [];
+
+ options = options || {};
+
+ var clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq;
+
+ // UUID timestamps are 100 nano-second units since the Gregorian epoch,
+ // (1582-10-15 00:00). JSNumbers aren't precise enough for this, so
+ // time is handled internally as 'msecs' (integer milliseconds) and 'nsecs'
+ // (100-nanoseconds offset from msecs) since unix epoch, 1970-01-01 00:00.
+ var msecs = options.msecs !== undefined ? options.msecs : new Date().getTime();
+
+ // Per 4.2.1.2, use count of uuid's generated during the current clock
+ // cycle to simulate higher resolution clock
+ var nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1;
+
+ // Time since last uuid creation (in msecs)
+ var dt = (msecs - _lastMSecs) + (nsecs - _lastNSecs)/10000;
+
+ // Per 4.2.1.2, Bump clockseq on clock regression
+ if (dt < 0 && options.clockseq === undefined) {
+ clockseq = clockseq + 1 & 0x3fff;
+ }
+
+ // Reset nsecs if clock regresses (new clockseq) or we've moved onto a new
+ // time interval
+ if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
+ nsecs = 0;
+ }
+
+ // Per 4.2.1.2 Throw error if too many uuids are requested
+ if (nsecs >= 10000) {
+ throw new Error('uuid.v1(): Can\'t create more than 10M uuids/sec');
+ }
+
+ _lastMSecs = msecs;
+ _lastNSecs = nsecs;
+ _clockseq = clockseq;
+
+ // Per 4.1.4 - Convert from unix epoch to Gregorian epoch
+ msecs += 12219292800000;
+
+ // `time_low`
+ var tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
+ b[i++] = tl >>> 24 & 0xff;
+ b[i++] = tl >>> 16 & 0xff;
+ b[i++] = tl >>> 8 & 0xff;
+ b[i++] = tl & 0xff;
+
+ // `time_mid`
+ var tmh = (msecs / 0x100000000 * 10000) & 0xfffffff;
+ b[i++] = tmh >>> 8 & 0xff;
+ b[i++] = tmh & 0xff;
+
+ // `time_high_and_version`
+ b[i++] = tmh >>> 24 & 0xf | 0x10; // include version
+ b[i++] = tmh >>> 16 & 0xff;
+
+ // `clock_seq_hi_and_reserved` (Per 4.2.2 - include variant)
+ b[i++] = clockseq >>> 8 | 0x80;
+
+ // `clock_seq_low`
+ b[i++] = clockseq & 0xff;
+
+ // `node`
+ var node = options.node || _nodeId;
+ for (var n = 0; n < 6; ++n) {
+ b[i + n] = node[n];
+ }
+
+ return buf ? buf : bytesToUuid(b);
+}
+
+module.exports = v1;