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30 lines
680 B
30 lines
680 B
1 year ago
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var rng = require('./lib/rng');
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var bytesToUuid = require('./lib/bytesToUuid');
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function v4(options, buf, offset) {
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var i = buf && offset || 0;
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if (typeof(options) == 'string') {
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buf = options === 'binary' ? new Array(16) : null;
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options = null;
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}
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options = options || {};
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var rnds = options.random || (options.rng || rng)();
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// Per 4.4, set bits for version and `clock_seq_hi_and_reserved`
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rnds[6] = (rnds[6] & 0x0f) | 0x40;
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rnds[8] = (rnds[8] & 0x3f) | 0x80;
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// Copy bytes to buffer, if provided
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if (buf) {
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for (var ii = 0; ii < 16; ++ii) {
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buf[i + ii] = rnds[ii];
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}
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}
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return buf || bytesToUuid(rnds);
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}
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module.exports = v4;
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