| 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; |