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2 |
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3 |
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4 | var rng = require('./lib/rng');
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5 | var bytesToUuid = require('./lib/bytesToUuid');
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6 |
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7 |
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8 |
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9 |
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10 |
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11 |
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12 |
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13 | var _seedBytes = rng();
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14 |
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15 |
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16 | var _nodeId = [
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17 | _seedBytes[0] | 0x01,
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18 | _seedBytes[1], _seedBytes[2], _seedBytes[3], _seedBytes[4], _seedBytes[5]
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19 | ];
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20 |
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21 |
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22 | var _clockseq = (_seedBytes[6] << 8 | _seedBytes[7]) & 0x3fff;
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23 |
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24 |
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25 | var _lastMSecs = 0, _lastNSecs = 0;
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26 |
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27 |
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28 | function v1(options, buf, offset) {
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29 | var i = buf && offset || 0;
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30 | var b = buf || [];
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31 |
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32 | options = options || {};
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33 |
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34 | var clockseq = options.clockseq !== undefined ? options.clockseq : _clockseq;
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35 |
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36 |
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37 |
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38 |
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39 |
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40 | var msecs = options.msecs !== undefined ? options.msecs : new Date().getTime();
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41 |
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42 |
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43 |
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44 | var nsecs = options.nsecs !== undefined ? options.nsecs : _lastNSecs + 1;
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45 |
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46 |
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47 | var dt = (msecs - _lastMSecs) + (nsecs - _lastNSecs)/10000;
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48 |
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49 |
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50 | if (dt < 0 && options.clockseq === undefined) {
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51 | clockseq = clockseq + 1 & 0x3fff;
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52 | }
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53 |
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54 |
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55 |
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56 | if ((dt < 0 || msecs > _lastMSecs) && options.nsecs === undefined) {
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57 | nsecs = 0;
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58 | }
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59 |
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60 |
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61 | if (nsecs >= 10000) {
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62 | throw new Error('uuid.v1(): Can\'t create more than 10M uuids/sec');
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63 | }
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64 |
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65 | _lastMSecs = msecs;
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66 | _lastNSecs = nsecs;
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67 | _clockseq = clockseq;
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68 |
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69 |
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70 | msecs += 12219292800000;
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71 |
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72 |
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73 | var tl = ((msecs & 0xfffffff) * 10000 + nsecs) % 0x100000000;
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74 | b[i++] = tl >>> 24 & 0xff;
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75 | b[i++] = tl >>> 16 & 0xff;
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76 | b[i++] = tl >>> 8 & 0xff;
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77 | b[i++] = tl & 0xff;
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78 |
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79 |
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80 | var tmh = (msecs / 0x100000000 * 10000) & 0xfffffff;
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81 | b[i++] = tmh >>> 8 & 0xff;
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82 | b[i++] = tmh & 0xff;
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83 |
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84 |
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85 | b[i++] = tmh >>> 24 & 0xf | 0x10;
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86 | b[i++] = tmh >>> 16 & 0xff;
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87 |
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88 |
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89 | b[i++] = clockseq >>> 8 | 0x80;
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90 |
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91 |
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92 | b[i++] = clockseq & 0xff;
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93 |
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94 |
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95 | var node = options.node || _nodeId;
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96 | for (var n = 0; n < 6; ++n) {
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97 | b[i + n] = node[n];
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98 | }
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99 |
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100 | return buf ? buf : bytesToUuid(b);
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101 | }
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102 |
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103 | module.exports = v1;
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