1 | 'use strict';
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2 |
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10 |
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11 | function concat (list, totalLength) {
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12 | const target = Buffer.allocUnsafe(totalLength);
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13 | var offset = 0;
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14 |
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15 | for (var i = 0; i < list.length; i++) {
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16 | const buf = list[i];
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17 | buf.copy(target, offset);
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18 | offset += buf.length;
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19 | }
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20 |
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21 | return target;
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22 | }
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23 |
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27 |
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28 |
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30 |
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31 |
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32 |
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33 |
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34 | function _mask (source, mask, output, offset, length) {
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35 | for (var i = 0; i < length; i++) {
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36 | output[offset + i] = source[i] ^ mask[i & 3];
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37 | }
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38 | }
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39 |
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40 |
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41 |
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42 |
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43 |
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44 |
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45 |
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46 |
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47 | function _unmask (buffer, mask) {
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48 |
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49 | const length = buffer.length;
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50 | for (var i = 0; i < length; i++) {
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51 | buffer[i] ^= mask[i & 3];
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52 | }
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53 | }
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54 |
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55 | try {
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56 | const bufferUtil = require('bufferutil');
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57 | const bu = bufferUtil.BufferUtil || bufferUtil;
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58 |
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59 | module.exports = {
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60 | mask (source, mask, output, offset, length) {
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61 | if (length < 48) _mask(source, mask, output, offset, length);
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62 | else bu.mask(source, mask, output, offset, length);
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63 | },
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64 | unmask (buffer, mask) {
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65 | if (buffer.length < 32) _unmask(buffer, mask);
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66 | else bu.unmask(buffer, mask);
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67 | },
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68 | concat
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69 | };
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70 | } catch (e) {
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71 | module.exports = { concat, mask: _mask, unmask: _unmask };
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72 | }
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