[6a3a178] | 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-native');
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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 IEEE754 = require('../internals/ieee754');
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| 13 | var getPrototypeOf = require('../internals/object-get-prototype-of');
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| 14 | var setPrototypeOf = require('../internals/object-set-prototype-of');
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| 15 | var getOwnPropertyNames = require('../internals/object-get-own-property-names').f;
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| 16 | var defineProperty = require('../internals/object-define-property').f;
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| 17 | var arrayFill = require('../internals/array-fill');
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| 18 | var setToStringTag = require('../internals/set-to-string-tag');
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| 19 | var InternalStateModule = require('../internals/internal-state');
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| 20 |
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| 21 | var getInternalState = InternalStateModule.get;
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| 22 | var setInternalState = InternalStateModule.set;
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| 23 | var ARRAY_BUFFER = 'ArrayBuffer';
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| 24 | var DATA_VIEW = 'DataView';
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| 25 | var PROTOTYPE = 'prototype';
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| 26 | var WRONG_LENGTH = 'Wrong length';
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| 27 | var WRONG_INDEX = 'Wrong index';
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| 28 | var NativeArrayBuffer = global[ARRAY_BUFFER];
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| 29 | var $ArrayBuffer = NativeArrayBuffer;
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| 30 | var $DataView = global[DATA_VIEW];
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| 31 | var $DataViewPrototype = $DataView && $DataView[PROTOTYPE];
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| 32 | var ObjectPrototype = Object.prototype;
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| 33 | var RangeError = global.RangeError;
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| 34 |
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| 35 | var packIEEE754 = IEEE754.pack;
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| 36 | var unpackIEEE754 = IEEE754.unpack;
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| 37 |
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| 38 | var packInt8 = function (number) {
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| 39 | return [number & 0xFF];
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| 40 | };
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| 41 |
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| 42 | var packInt16 = function (number) {
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| 43 | return [number & 0xFF, number >> 8 & 0xFF];
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| 44 | };
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| 45 |
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| 46 | var packInt32 = function (number) {
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| 47 | return [number & 0xFF, number >> 8 & 0xFF, number >> 16 & 0xFF, number >> 24 & 0xFF];
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| 48 | };
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| 49 |
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| 50 | var unpackInt32 = function (buffer) {
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| 51 | return buffer[3] << 24 | buffer[2] << 16 | buffer[1] << 8 | buffer[0];
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| 52 | };
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| 53 |
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| 54 | var packFloat32 = function (number) {
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| 55 | return packIEEE754(number, 23, 4);
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| 56 | };
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| 57 |
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| 58 | var packFloat64 = function (number) {
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| 59 | return packIEEE754(number, 52, 8);
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| 60 | };
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| 61 |
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| 62 | var addGetter = function (Constructor, key) {
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| 63 | defineProperty(Constructor[PROTOTYPE], key, { get: function () { return getInternalState(this)[key]; } });
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| 64 | };
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| 65 |
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| 66 | var get = function (view, count, index, isLittleEndian) {
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| 67 | var intIndex = toIndex(index);
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| 68 | var store = getInternalState(view);
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| 69 | if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
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| 70 | var bytes = getInternalState(store.buffer).bytes;
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| 71 | var start = intIndex + store.byteOffset;
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| 72 | var pack = bytes.slice(start, start + count);
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| 73 | return isLittleEndian ? pack : pack.reverse();
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| 74 | };
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| 75 |
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| 76 | var set = function (view, count, index, conversion, value, isLittleEndian) {
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| 77 | var intIndex = toIndex(index);
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| 78 | var store = getInternalState(view);
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| 79 | if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX);
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| 80 | var bytes = getInternalState(store.buffer).bytes;
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| 81 | var start = intIndex + store.byteOffset;
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| 82 | var pack = conversion(+value);
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| 83 | for (var i = 0; i < count; i++) bytes[start + i] = pack[isLittleEndian ? i : count - i - 1];
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| 84 | };
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| 85 |
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| 86 | if (!NATIVE_ARRAY_BUFFER) {
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| 87 | $ArrayBuffer = function ArrayBuffer(length) {
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| 88 | anInstance(this, $ArrayBuffer, ARRAY_BUFFER);
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| 89 | var byteLength = toIndex(length);
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| 90 | setInternalState(this, {
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| 91 | bytes: arrayFill.call(new Array(byteLength), 0),
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| 92 | byteLength: byteLength
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| 93 | });
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| 94 | if (!DESCRIPTORS) this.byteLength = byteLength;
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| 95 | };
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| 96 |
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| 97 | $DataView = function DataView(buffer, byteOffset, byteLength) {
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| 98 | anInstance(this, $DataView, DATA_VIEW);
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| 99 | anInstance(buffer, $ArrayBuffer, DATA_VIEW);
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| 100 | var bufferLength = getInternalState(buffer).byteLength;
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| 101 | var offset = toInteger(byteOffset);
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| 102 | if (offset < 0 || offset > bufferLength) throw RangeError('Wrong offset');
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| 103 | byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength);
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| 104 | if (offset + byteLength > bufferLength) throw RangeError(WRONG_LENGTH);
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| 105 | setInternalState(this, {
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| 106 | buffer: buffer,
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| 107 | byteLength: byteLength,
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| 108 | byteOffset: offset
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| 109 | });
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| 110 | if (!DESCRIPTORS) {
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| 111 | this.buffer = buffer;
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| 112 | this.byteLength = byteLength;
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| 113 | this.byteOffset = offset;
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| 114 | }
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| 115 | };
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| 116 |
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| 117 | if (DESCRIPTORS) {
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| 118 | addGetter($ArrayBuffer, 'byteLength');
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| 119 | addGetter($DataView, 'buffer');
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| 120 | addGetter($DataView, 'byteLength');
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| 121 | addGetter($DataView, 'byteOffset');
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| 122 | }
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| 123 |
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| 124 | redefineAll($DataView[PROTOTYPE], {
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| 125 | getInt8: function getInt8(byteOffset) {
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| 126 | return get(this, 1, byteOffset)[0] << 24 >> 24;
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| 127 | },
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| 128 | getUint8: function getUint8(byteOffset) {
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| 129 | return get(this, 1, byteOffset)[0];
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| 130 | },
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| 131 | getInt16: function getInt16(byteOffset /* , littleEndian */) {
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| 132 | var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
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| 133 | return (bytes[1] << 8 | bytes[0]) << 16 >> 16;
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| 134 | },
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| 135 | getUint16: function getUint16(byteOffset /* , littleEndian */) {
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| 136 | var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined);
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| 137 | return bytes[1] << 8 | bytes[0];
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| 138 | },
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| 139 | getInt32: function getInt32(byteOffset /* , littleEndian */) {
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| 140 | return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined));
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| 141 | },
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| 142 | getUint32: function getUint32(byteOffset /* , littleEndian */) {
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| 143 | return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined)) >>> 0;
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| 144 | },
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| 145 | getFloat32: function getFloat32(byteOffset /* , littleEndian */) {
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| 146 | return unpackIEEE754(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 23);
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| 147 | },
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| 148 | getFloat64: function getFloat64(byteOffset /* , littleEndian */) {
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| 149 | return unpackIEEE754(get(this, 8, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 52);
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| 150 | },
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| 151 | setInt8: function setInt8(byteOffset, value) {
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| 152 | set(this, 1, byteOffset, packInt8, value);
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| 153 | },
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| 154 | setUint8: function setUint8(byteOffset, value) {
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| 155 | set(this, 1, byteOffset, packInt8, value);
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| 156 | },
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| 157 | setInt16: function setInt16(byteOffset, value /* , littleEndian */) {
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| 158 | set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
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| 159 | },
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| 160 | setUint16: function setUint16(byteOffset, value /* , littleEndian */) {
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| 161 | set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined);
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| 162 | },
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| 163 | setInt32: function setInt32(byteOffset, value /* , littleEndian */) {
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| 164 | set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
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| 165 | },
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| 166 | setUint32: function setUint32(byteOffset, value /* , littleEndian */) {
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| 167 | set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined);
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| 168 | },
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| 169 | setFloat32: function setFloat32(byteOffset, value /* , littleEndian */) {
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| 170 | set(this, 4, byteOffset, packFloat32, value, arguments.length > 2 ? arguments[2] : undefined);
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| 171 | },
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| 172 | setFloat64: function setFloat64(byteOffset, value /* , littleEndian */) {
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| 173 | set(this, 8, byteOffset, packFloat64, value, arguments.length > 2 ? arguments[2] : undefined);
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| 174 | }
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| 175 | });
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| 176 | } else {
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| 177 | /* eslint-disable no-new -- required for testing */
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| 178 | if (!fails(function () {
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| 179 | NativeArrayBuffer(1);
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| 180 | }) || !fails(function () {
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| 181 | new NativeArrayBuffer(-1);
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| 182 | }) || fails(function () {
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| 183 | new NativeArrayBuffer();
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| 184 | new NativeArrayBuffer(1.5);
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| 185 | new NativeArrayBuffer(NaN);
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| 186 | return NativeArrayBuffer.name != ARRAY_BUFFER;
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| 187 | })) {
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| 188 | /* eslint-enable no-new -- required for testing */
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| 189 | $ArrayBuffer = function ArrayBuffer(length) {
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| 190 | anInstance(this, $ArrayBuffer);
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| 191 | return new NativeArrayBuffer(toIndex(length));
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| 192 | };
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| 193 | var ArrayBufferPrototype = $ArrayBuffer[PROTOTYPE] = NativeArrayBuffer[PROTOTYPE];
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| 194 | for (var keys = getOwnPropertyNames(NativeArrayBuffer), j = 0, key; keys.length > j;) {
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| 195 | if (!((key = keys[j++]) in $ArrayBuffer)) {
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| 196 | createNonEnumerableProperty($ArrayBuffer, key, NativeArrayBuffer[key]);
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| 197 | }
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| 198 | }
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| 199 | ArrayBufferPrototype.constructor = $ArrayBuffer;
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| 200 | }
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| 201 |
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| 202 | // WebKit bug - the same parent prototype for typed arrays and data view
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| 203 | if (setPrototypeOf && getPrototypeOf($DataViewPrototype) !== ObjectPrototype) {
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| 204 | setPrototypeOf($DataViewPrototype, ObjectPrototype);
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| 205 | }
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| 206 |
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| 207 | // iOS Safari 7.x bug
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| 208 | var testView = new $DataView(new $ArrayBuffer(2));
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| 209 | var $setInt8 = $DataViewPrototype.setInt8;
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| 210 | testView.setInt8(0, 2147483648);
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| 211 | testView.setInt8(1, 2147483649);
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| 212 | if (testView.getInt8(0) || !testView.getInt8(1)) redefineAll($DataViewPrototype, {
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| 213 | setInt8: function setInt8(byteOffset, value) {
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| 214 | $setInt8.call(this, byteOffset, value << 24 >> 24);
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| 215 | },
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| 216 | setUint8: function setUint8(byteOffset, value) {
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| 217 | $setInt8.call(this, byteOffset, value << 24 >> 24);
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| 218 | }
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| 219 | }, { unsafe: true });
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| 220 | }
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| 221 |
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| 222 | setToStringTag($ArrayBuffer, ARRAY_BUFFER);
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| 223 | setToStringTag($DataView, DATA_VIEW);
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| 224 |
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| 225 | module.exports = {
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| 226 | ArrayBuffer: $ArrayBuffer,
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| 227 | DataView: $DataView
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| 228 | };
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