1 | 'use strict';
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2 | var global = require('../internals/global');
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3 | var DESCRIPTORS = require('../internals/descriptors');
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4 | var NATIVE_ARRAY_BUFFER = require('../internals/array-buffer-view-core').NATIVE_ARRAY_BUFFER;
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5 | var createNonEnumerableProperty = require('../internals/create-non-enumerable-property');
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6 | var redefineAll = require('../internals/redefine-all');
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7 | var fails = require('../internals/fails');
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8 | var anInstance = require('../internals/an-instance');
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9 | var toInteger = require('../internals/to-integer');
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10 | var toLength = require('../internals/to-length');
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11 | var toIndex = require('../internals/to-index');
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12 | var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
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13 | var defineProperty = require('../internals/object-define-property').f;
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14 | var arrayFill = require('../internals/array-fill');
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15 | var setToStringTag = require('../internals/set-to-string-tag');
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16 | var InternalStateModule = require('../internals/internal-state');
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17 |
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18 | var getInternalState = InternalStateModule.get;
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19 | var setInternalState = InternalStateModule.set;
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20 | var ARRAY_BUFFER = 'ArrayBuffer';
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21 | var DATA_VIEW = 'DataView';
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22 | var PROTOTYPE = 'prototype';
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23 | var WRONG_LENGTH = 'Wrong length';
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24 | var WRONG_INDEX = 'Wrong index';
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25 | var NativeArrayBuffer = global[ARRAY_BUFFER];
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26 | var $ArrayBuffer = NativeArrayBuffer;
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27 | var $DataView = global[DATA_VIEW];
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28 | var Math = global.Math;
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29 | var RangeError = global.RangeError;
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30 |
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31 | var Infinity = 1 / 0;
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32 | var abs = Math.abs;
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33 | var pow = Math.pow;
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34 | var floor = Math.floor;
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35 | var log = Math.log;
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36 | var LN2 = Math.LN2;
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37 |
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38 |
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39 | var packIEEE754 = function (number, mantissaLength, bytes) {
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40 | var buffer = new Array(bytes);
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41 | var exponentLength = bytes * 8 - mantissaLength - 1;
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42 | var eMax = (1 << exponentLength) - 1;
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43 | var eBias = eMax >> 1;
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44 | var rt = mantissaLength === 23 ? pow(2, -24) - pow(2, -77) : 0;
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45 | var sign = number < 0 || number === 0 && 1 / number < 0 ? 1 : 0;
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46 | var index = 0;
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47 | var exponent, mantissa, c;
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48 | number = abs(number);
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49 |
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50 | if (number != number || number === Infinity) {
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51 |
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52 | mantissa = number != number ? 1 : 0;
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53 | exponent = eMax;
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54 | } else {
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55 | exponent = floor(log(number) / LN2);
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56 | if (number * (c = pow(2, -exponent)) < 1) {
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57 | exponent--;
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58 | c *= 2;
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59 | }
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60 | if (exponent + eBias >= 1) {
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61 | number += rt / c;
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62 | } else {
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63 | number += rt * pow(2, 1 - eBias);
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64 | }
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65 | if (number * c >= 2) {
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66 | exponent++;
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67 | c /= 2;
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68 | }
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69 | if (exponent + eBias >= eMax) {
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70 | mantissa = 0;
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71 | exponent = eMax;
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72 | } else if (exponent + eBias >= 1) {
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73 | mantissa = (number * c - 1) * pow(2, mantissaLength);
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74 | exponent = exponent + eBias;
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75 | } else {
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76 | mantissa = number * pow(2, eBias - 1) * pow(2, mantissaLength);
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77 | exponent = 0;
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78 | }
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79 | }
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80 | for (; mantissaLength >= 8; buffer[index++] = mantissa & 255, mantissa /= 256, mantissaLength -= 8);
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81 | exponent = exponent << mantissaLength | mantissa;
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82 | exponentLength += mantissaLength;
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83 | for (; exponentLength > 0; buffer[index++] = exponent & 255, exponent /= 256, exponentLength -= 8);
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84 | buffer[--index] |= sign * 128;
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85 | return buffer;
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86 | };
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87 |
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88 | var unpackIEEE754 = function (buffer, mantissaLength) {
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89 | var bytes = buffer.length;
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90 | var exponentLength = bytes * 8 - mantissaLength - 1;
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91 | var eMax = (1 << exponentLength) - 1;
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92 | var eBias = eMax >> 1;
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93 | var nBits = exponentLength - 7;
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94 | var index = bytes - 1;
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95 | var sign = buffer[index--];
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96 | var exponent = sign & 127;
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97 | var mantissa;
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98 | sign >>= 7;
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99 | for (; nBits > 0; exponent = exponent * 256 + buffer[index], index--, nBits -= 8);
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100 | mantissa = exponent & (1 << -nBits) - 1;
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101 | exponent >>= -nBits;
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102 | nBits += mantissaLength;
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103 | for (; nBits > 0; mantissa = mantissa * 256 + buffer[index], index--, nBits -= 8);
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104 | if (exponent === 0) {
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105 | exponent = 1 - eBias;
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106 | } else if (exponent === eMax) {
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107 | return mantissa ? NaN : sign ? -Infinity : Infinity;
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108 | } else {
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109 | mantissa = mantissa + pow(2, mantissaLength);
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110 | exponent = exponent - eBias;
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111 | } return (sign ? -1 : 1) * mantissa * pow(2, exponent - mantissaLength);
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112 | };
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113 |
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114 | var unpackInt32 = function (buffer) {
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115 | return buffer[3] << 24 | buffer[2] << 16 | buffer[1] << 8 | buffer[0];
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116 | };
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117 |
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118 | var packInt8 = function (number) {
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119 | return [number & 0xFF];
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120 | };
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121 |
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122 | var packInt16 = function (number) {
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123 | return [number & 0xFF, number >> 8 & 0xFF];
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124 | };
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125 |
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126 | var packInt32 = function (number) {
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127 | return [number & 0xFF, number >> 8 & 0xFF, number >> 16 & 0xFF, number >> 24 & 0xFF];
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128 | };
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129 |
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130 | var packFloat32 = function (number) {
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131 | return packIEEE754(number, 23, 4);
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132 | };
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133 |
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134 | var packFloat64 = function (number) {
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135 | return packIEEE754(number, 52, 8);
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136 | };
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137 |
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138 | var addGetter = function (Constructor, key) {
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139 | defineProperty(Constructor[PROTOTYPE], key, { get: function () { return getInternalState(this)[key]; } });
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140 | };
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141 |
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142 | var get = function (view, count, index, isLittleEndian) {
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143 | var numIndex = +index;
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144 | var intIndex = toIndex(numIndex);
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145 | var store = getInternalState(view);
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146 | if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
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147 | var bytes = getInternalState(store.buffer).bytes;
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148 | var start = intIndex + store.byteOffset;
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149 | var pack = bytes.slice(start, start + count);
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150 | return isLittleEndian ? pack : pack.reverse();
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151 | };
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152 |
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153 | var set = function (view, count, index, conversion, value, isLittleEndian) {
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154 | var numIndex = +index;
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155 | var intIndex = toIndex(numIndex);
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156 | var store = getInternalState(view);
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157 | if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
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158 | var bytes = getInternalState(store.buffer).bytes;
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159 | var start = intIndex + store.byteOffset;
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160 | var pack = conversion(+value);
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161 | for (var i = 0; i < count; i++) bytes[start + i] = pack[isLittleEndian ? i : count - i - 1];
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162 | };
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163 |
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164 | if (!NATIVE_ARRAY_BUFFER) {
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165 | $ArrayBuffer = function ArrayBuffer(length) {
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166 | anInstance(this, $ArrayBuffer, ARRAY_BUFFER);
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167 | var byteLength = toIndex(length);
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168 | setInternalState(this, {
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169 | bytes: arrayFill.call(new Array(byteLength), 0),
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170 | byteLength: byteLength
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171 | });
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172 | if (!DESCRIPTORS) this.byteLength = byteLength;
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173 | };
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174 |
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175 | $DataView = function DataView(buffer, byteOffset, byteLength) {
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176 | anInstance(this, $DataView, DATA_VIEW);
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177 | anInstance(buffer, $ArrayBuffer, DATA_VIEW);
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178 | var bufferLength = getInternalState(buffer).byteLength;
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179 | var offset = toInteger(byteOffset);
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180 | if (offset < 0 || offset > bufferLength) throw RangeError('Wrong offset');
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181 | byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength);
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182 | if (offset + byteLength > bufferLength) throw RangeError(WRONG_LENGTH);
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183 | setInternalState(this, {
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184 | buffer: buffer,
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185 | byteLength: byteLength,
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186 | byteOffset: offset
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187 | });
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188 | if (!DESCRIPTORS) {
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189 | this.buffer = buffer;
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190 | this.byteLength = byteLength;
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191 | this.byteOffset = offset;
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192 | }
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193 | };
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194 |
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195 | if (DESCRIPTORS) {
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196 | addGetter($ArrayBuffer, 'byteLength');
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197 | addGetter($DataView, 'buffer');
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198 | addGetter($DataView, 'byteLength');
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199 | addGetter($DataView, 'byteOffset');
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200 | }
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201 |
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202 | redefineAll($DataView[PROTOTYPE], {
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203 | getInt8: function getInt8(byteOffset) {
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204 | return get(this, 1, byteOffset)[0] << 24 >> 24;
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205 | },
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206 | getUint8: function getUint8(byteOffset) {
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207 | return get(this, 1, byteOffset)[0];
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208 | },
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209 | getInt16: function getInt16(byteOffset /* , littleEndian */) {
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210 | var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
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211 | return (bytes[1] << 8 | bytes[0]) << 16 >> 16;
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212 | },
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213 | getUint16: function getUint16(byteOffset /* , littleEndian */) {
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214 | var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
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215 | return bytes[1] << 8 | bytes[0];
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216 | },
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217 | getInt32: function getInt32(byteOffset /* , littleEndian */) {
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218 | return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined));
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219 | },
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220 | getUint32: function getUint32(byteOffset /* , littleEndian */) {
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221 | return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined)) >>> 0;
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222 | },
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223 | getFloat32: function getFloat32(byteOffset /* , littleEndian */) {
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224 | return unpackIEEE754(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 23);
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225 | },
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226 | getFloat64: function getFloat64(byteOffset /* , littleEndian */) {
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227 | return unpackIEEE754(get(this, 8, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 52);
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228 | },
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229 | setInt8: function setInt8(byteOffset, value) {
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230 | set(this, 1, byteOffset, packInt8, value);
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231 | },
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232 | setUint8: function setUint8(byteOffset, value) {
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233 | set(this, 1, byteOffset, packInt8, value);
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234 | },
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235 | setInt16: function setInt16(byteOffset, value /* , littleEndian */) {
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236 | set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
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237 | },
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238 | setUint16: function setUint16(byteOffset, value /* , littleEndian */) {
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239 | set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
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240 | },
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241 | setInt32: function setInt32(byteOffset, value /* , littleEndian */) {
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242 | set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
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243 | },
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244 | setUint32: function setUint32(byteOffset, value /* , littleEndian */) {
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245 | set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
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246 | },
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247 | setFloat32: function setFloat32(byteOffset, value /* , littleEndian */) {
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248 | set(this, 4, byteOffset, packFloat32, value, arguments.length > 2 ? arguments[2] : undefined);
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249 | },
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250 | setFloat64: function setFloat64(byteOffset, value /* , littleEndian */) {
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251 | set(this, 8, byteOffset, packFloat64, value, arguments.length > 2 ? arguments[2] : undefined);
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252 | }
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253 | });
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254 | } else {
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255 | if (!fails(function () {
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256 | NativeArrayBuffer(1);
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257 | }) || !fails(function () {
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258 | new NativeArrayBuffer(-1);
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259 | }) || fails(function () {
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260 | new NativeArrayBuffer();
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261 | new NativeArrayBuffer(1.5);
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262 | new NativeArrayBuffer(NaN);
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263 | return NativeArrayBuffer.name != ARRAY_BUFFER;
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264 | })) {
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265 | $ArrayBuffer = function ArrayBuffer(length) {
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266 | anInstance(this, $ArrayBuffer);
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267 | return new NativeArrayBuffer(toIndex(length));
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268 | };
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269 | var ArrayBufferPrototype = $ArrayBuffer[PROTOTYPE] = NativeArrayBuffer[PROTOTYPE];
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270 | for (var keys = getOwnPropertyNames(NativeArrayBuffer), j = 0, key; keys.length > j;) {
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271 | if (!((key = keys[j++]) in $ArrayBuffer)) {
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272 | createNonEnumerableProperty($ArrayBuffer, key, NativeArrayBuffer[key]);
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273 | }
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274 | }
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275 | ArrayBufferPrototype.constructor = $ArrayBuffer;
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276 | }
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277 |
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278 | var testView = new $DataView(new $ArrayBuffer(2));
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279 | var nativeSetInt8 = $DataView[PROTOTYPE].setInt8;
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280 | testView.setInt8(0, 2147483648);
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281 | testView.setInt8(1, 2147483649);
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282 | if (testView.getInt8(0) || !testView.getInt8(1)) redefineAll($DataView[PROTOTYPE], {
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283 | setInt8: function setInt8(byteOffset, value) {
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284 | nativeSetInt8.call(this, byteOffset, value << 24 >> 24);
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285 | },
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286 | setUint8: function setUint8(byteOffset, value) {
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287 | nativeSetInt8.call(this, byteOffset, value << 24 >> 24);
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288 | }
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289 | }, { unsafe: true });
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290 | }
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291 |
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292 | setToStringTag($ArrayBuffer, ARRAY_BUFFER);
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293 | setToStringTag($DataView, DATA_VIEW);
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294 |
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295 | module.exports = {
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296 | ArrayBuffer: $ArrayBuffer,
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297 | DataView: $DataView
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298 | };
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