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10 |
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11 | const textRange = function(range, i) {
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12 | return range.start(i) + '-' + range.end(i);
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13 | };
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14 |
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18 |
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19 |
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20 |
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21 | const formatHexString = function(e, i) {
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22 | let value = e.toString(16);
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23 |
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24 | return '00'.substring(0, 2 - value.length) + value + (i % 2 ? ' ' : '');
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25 | };
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26 | const formatAsciiString = function(e) {
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27 | if (e >= 0x20 && e < 0x7e) {
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28 | return String.fromCharCode(e);
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29 | }
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30 | return '.';
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31 | };
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32 |
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33 |
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34 |
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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 |
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41 |
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42 |
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43 | const createTransferableMessage = function(message) {
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44 | const transferable = {};
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45 |
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46 | Object.keys(message).forEach((key) => {
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47 | const value = message[key];
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48 |
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49 | if (ArrayBuffer.isView(value)) {
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50 | transferable[key] = {
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51 | bytes: value.buffer,
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52 | byteOffset: value.byteOffset,
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53 | byteLength: value.byteLength
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54 | };
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55 | } else {
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56 | transferable[key] = value;
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57 | }
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58 | });
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59 |
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60 | return transferable;
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61 | };
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62 |
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63 |
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64 |
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65 |
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66 |
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67 | const initSegmentId = function(initSegment) {
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68 | let byterange = initSegment.byterange || {
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69 | length: Infinity,
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70 | offset: 0
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71 | };
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72 |
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73 | return [
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74 | byterange.length, byterange.offset, initSegment.resolvedUri
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75 | ].join(',');
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76 | };
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77 |
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78 |
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79 |
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80 |
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81 | const utils = {
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82 | hexDump(data) {
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83 | let bytes = Array.prototype.slice.call(data);
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84 | let step = 16;
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85 | let result = '';
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86 | let hex;
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87 | let ascii;
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88 |
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89 | for (let j = 0; j < bytes.length / step; j++) {
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90 | hex = bytes.slice(j * step, j * step + step).map(formatHexString).join('');
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91 | ascii = bytes.slice(j * step, j * step + step).map(formatAsciiString).join('');
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92 | result += hex + ' ' + ascii + '\n';
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93 | }
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94 | return result;
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95 | },
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96 | tagDump(tag) {
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97 | return utils.hexDump(tag.bytes);
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98 | },
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99 | textRanges(ranges) {
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100 | let result = '';
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101 | let i;
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102 |
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103 | for (i = 0; i < ranges.length; i++) {
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104 | result += textRange(ranges, i) + ' ';
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105 | }
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106 | return result;
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107 | },
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108 | createTransferableMessage,
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109 | initSegmentId
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110 | };
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111 |
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112 | export default utils;
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