1 | var rng = require('./lib/rng');
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2 | var bytesToUuid = require('./lib/bytesToUuid');
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3 |
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4 | function v4(options, buf, offset) {
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5 | var i = buf && offset || 0;
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6 |
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7 | if (typeof(options) == 'string') {
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8 | buf = options === 'binary' ? new Array(16) : null;
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9 | options = null;
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10 | }
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11 | options = options || {};
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12 |
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13 | var rnds = options.random || (options.rng || rng)();
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14 |
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15 |
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16 | rnds[6] = (rnds[6] & 0x0f) | 0x40;
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17 | rnds[8] = (rnds[8] & 0x3f) | 0x80;
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18 |
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19 |
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20 | if (buf) {
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21 | for (var ii = 0; ii < 16; ++ii) {
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22 | buf[i + ii] = rnds[ii];
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23 | }
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24 | }
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25 |
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26 | return buf || bytesToUuid(rnds);
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27 | }
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28 |
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29 | module.exports = v4;
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