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12 | 'use strict'
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13 |
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14 | const varint = require('varint')
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15 | const intTable = require('./int-table')
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16 | const codecNameToCodeVarint = require('./varint-table')
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17 | const util = require('./util')
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18 | const uint8ArrayConcat = require('uint8arrays/concat')
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19 |
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20 | exports = module.exports
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21 |
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22 |
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23 |
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24 |
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25 |
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26 |
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27 |
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28 |
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29 | exports.addPrefix = (multicodecStrOrCode, data) => {
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30 | let prefix
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31 |
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32 | if (multicodecStrOrCode instanceof Uint8Array) {
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33 | prefix = util.varintUint8ArrayEncode(multicodecStrOrCode)
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34 | } else {
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35 | if (codecNameToCodeVarint[multicodecStrOrCode]) {
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36 | prefix = codecNameToCodeVarint[multicodecStrOrCode]
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37 | } else {
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38 | throw new Error('multicodec not recognized')
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39 | }
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40 | }
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41 | return uint8ArrayConcat([prefix, data], prefix.length + data.length)
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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 |
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48 |
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49 |
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50 | exports.rmPrefix = (data) => {
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51 | varint.decode(data)
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52 | return data.slice(varint.decode.bytes)
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53 | }
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54 |
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55 |
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56 |
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57 |
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58 |
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59 |
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60 | exports.getCodec = (prefixedData) => {
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61 | const code = varint.decode(prefixedData)
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62 | const codecName = intTable.get(code)
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63 | if (codecName === undefined) {
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64 | throw new Error(`Code ${code} not found`)
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65 | }
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66 | return codecName
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67 | }
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68 |
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69 |
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70 |
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71 |
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72 |
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73 |
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74 | exports.getName = (codec) => {
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75 | return intTable.get(codec)
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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 |
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82 |
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83 | exports.getNumber = (name) => {
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84 | const code = codecNameToCodeVarint[name]
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85 | if (code === undefined) {
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86 | throw new Error('Codec `' + name + '` not found')
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87 | }
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88 | return varint.decode(code)
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89 | }
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90 |
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91 |
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92 |
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93 |
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94 |
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95 |
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96 | exports.getCode = (prefixedData) => {
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97 | return varint.decode(prefixedData)
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98 | }
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99 |
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100 |
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101 |
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102 |
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103 |
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104 |
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105 | exports.getCodeVarint = (codecName) => {
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106 | const code = codecNameToCodeVarint[codecName]
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107 | if (code === undefined) {
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108 | throw new Error('Codec `' + codecName + '` not found')
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109 | }
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110 | return code
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111 | }
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112 |
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113 |
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114 |
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115 |
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116 |
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117 |
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118 | exports.getVarint = (code) => {
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119 | return varint.encode(code)
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120 | }
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121 |
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122 |
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123 | const constants = require('./constants')
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124 | Object.assign(exports, constants)
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125 |
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126 |
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127 | exports.print = require('./print')
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