import native from './native.js'; | |
import rng from './rng.js'; | |
import { unsafeStringify } from './stringify.js'; | |
function v4(options, buf, offset) { | |
if (native.randomUUID && !buf && !options) { | |
return native.randomUUID(); | |
} | |
options = options || {}; | |
const rnds = options.random ?? options.rng?.() ?? rng(); | |
if (rnds.length < 16) { | |
throw new Error('Random bytes length must be >= 16'); | |
} | |
rnds[6] = (rnds[6] & 0x0f) | 0x40; | |
rnds[8] = (rnds[8] & 0x3f) | 0x80; | |
if (buf) { | |
offset = offset || 0; | |
if (offset < 0 || offset + 16 > buf.length) { | |
throw new RangeError(`UUID byte range ${offset}:${offset + 15} is out of buffer bounds`); | |
} | |
for (let i = 0; i < 16; ++i) { | |
buf[offset + i] = rnds[i]; | |
} | |
return buf; | |
} | |
return unsafeStringify(rnds); | |
} | |
export default v4; | |