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27 lines
883 B
27 lines
883 B
import native from './native.js'; |
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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 (native.randomUUID && !buf && !options) { |
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return native.randomUUID(); |
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} |
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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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