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29 lines
680 B
29 lines
680 B
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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