30 lines
926 B
Plaintext
30 lines
926 B
Plaintext
import rng from './rng.js';
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import { unsafeStringify } from './stringify.js';
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function v4(options, buf, offset) {
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if (!buf && !options && crypto.randomUUID) {
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return crypto.randomUUID();
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}
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return _v4(options, buf, offset);
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}
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function _v4(options, buf, offset) {
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options = options || {};
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const rnds = options.random ?? options.rng?.() ?? rng();
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if (rnds.length < 16) {
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throw new Error('Random bytes length must be >= 16');
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}
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rnds[6] = (rnds[6] & 0x0f) | 0x40;
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rnds[8] = (rnds[8] & 0x3f) | 0x80;
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if (buf) {
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offset = offset || 0;
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if (offset < 0 || offset + 16 > buf.length) {
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throw new RangeError(`UUID byte range ${offset}:${offset + 15} is out of buffer bounds`);
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}
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for (let i = 0; i < 16; ++i) {
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buf[offset + i] = rnds[i];
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}
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return buf;
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}
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return unsafeStringify(rnds);
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}
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export default v4;
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