aaac7fed
 liuqimichale
add
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
|
var rng = require('./lib/rng');
var bytesToUuid = require('./lib/bytesToUuid');
function v4(options, buf, offset) {
var i = buf && offset || 0;
if (typeof(options) == 'string') {
buf = options === 'binary' ? new Array(16) : null;
options = null;
}
options = options || {};
var rnds = options.random || (options.rng || rng)();
// Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
rnds[6] = (rnds[6] & 0x0f) | 0x40;
rnds[8] = (rnds[8] & 0x3f) | 0x80;
// Copy bytes to buffer, if provided
if (buf) {
for (var ii = 0; ii < 16; ++ii) {
buf[i + ii] = rnds[ii];
}
}
return buf || bytesToUuid(rnds);
}
module.exports = v4;
|
