| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | var rng = require('./lib/rng'); |
| 2 | var bytesToUuid = require('./lib/bytesToUuid'); |
| 3 | |
| 4 | function v4(options, buf, offset) { |
| 5 | var i = buf && offset || 0; |
| 6 | |
| 7 | if (typeof(options) == 'string') { |
| 8 | buf = options === 'binary' ? new Array(16) : null; |
| 9 | options = null; |
| 10 | } |
| 11 | options = options || {}; |
| 12 | |
| 13 | var rnds = options.random || (options.rng || rng)(); |
| 14 | |
| 15 | // Per 4.4, set bits for version and `clock_seq_hi_and_reserved` |
| 16 | rnds[6] = (rnds[6] & 0x0f) | 0x40; |
| 17 | rnds[8] = (rnds[8] & 0x3f) | 0x80; |
| 18 | |
| 19 | // Copy bytes to buffer, if provided |
| 20 | if (buf) { |
| 21 | for (var ii = 0; ii < 16; ++ii) { |
| 22 | buf[i + ii] = rnds[ii]; |
| 23 | } |
| 24 | } |
| 25 | |
| 26 | return buf || bytesToUuid(rnds); |
| 27 | } |
| 28 | |
| 29 | module.exports = v4; |