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276 lines
9.3 KiB
276 lines
9.3 KiB
'use strict'; |
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var global = require('./_global'); |
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var DESCRIPTORS = require('./_descriptors'); |
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var LIBRARY = require('./_library'); |
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var $typed = require('./_typed'); |
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var hide = require('./_hide'); |
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var redefineAll = require('./_redefine-all'); |
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var fails = require('./_fails'); |
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var anInstance = require('./_an-instance'); |
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var toInteger = require('./_to-integer'); |
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var toLength = require('./_to-length'); |
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var toIndex = require('./_to-index'); |
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var gOPN = require('./_object-gopn').f; |
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var dP = require('./_object-dp').f; |
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var arrayFill = require('./_array-fill'); |
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var setToStringTag = require('./_set-to-string-tag'); |
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var ARRAY_BUFFER = 'ArrayBuffer'; |
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var DATA_VIEW = 'DataView'; |
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var PROTOTYPE = 'prototype'; |
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var WRONG_LENGTH = 'Wrong length!'; |
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var WRONG_INDEX = 'Wrong index!'; |
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var $ArrayBuffer = global[ARRAY_BUFFER]; |
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var $DataView = global[DATA_VIEW]; |
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var Math = global.Math; |
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var RangeError = global.RangeError; |
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// eslint-disable-next-line no-shadow-restricted-names |
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var Infinity = global.Infinity; |
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var BaseBuffer = $ArrayBuffer; |
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var abs = Math.abs; |
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var pow = Math.pow; |
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var floor = Math.floor; |
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var log = Math.log; |
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var LN2 = Math.LN2; |
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var BUFFER = 'buffer'; |
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var BYTE_LENGTH = 'byteLength'; |
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var BYTE_OFFSET = 'byteOffset'; |
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var $BUFFER = DESCRIPTORS ? '_b' : BUFFER; |
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var $LENGTH = DESCRIPTORS ? '_l' : BYTE_LENGTH; |
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var $OFFSET = DESCRIPTORS ? '_o' : BYTE_OFFSET; |
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// IEEE754 conversions based on https://github.com/feross/ieee754 |
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function packIEEE754(value, mLen, nBytes) { |
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var buffer = new Array(nBytes); |
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var eLen = nBytes * 8 - mLen - 1; |
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var eMax = (1 << eLen) - 1; |
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var eBias = eMax >> 1; |
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var rt = mLen === 23 ? pow(2, -24) - pow(2, -77) : 0; |
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var i = 0; |
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var s = value < 0 || value === 0 && 1 / value < 0 ? 1 : 0; |
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var e, m, c; |
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value = abs(value); |
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// eslint-disable-next-line no-self-compare |
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if (value != value || value === Infinity) { |
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// eslint-disable-next-line no-self-compare |
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m = value != value ? 1 : 0; |
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e = eMax; |
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} else { |
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e = floor(log(value) / LN2); |
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if (value * (c = pow(2, -e)) < 1) { |
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e--; |
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c *= 2; |
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} |
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if (e + eBias >= 1) { |
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value += rt / c; |
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} else { |
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value += rt * pow(2, 1 - eBias); |
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} |
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if (value * c >= 2) { |
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e++; |
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c /= 2; |
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} |
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if (e + eBias >= eMax) { |
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m = 0; |
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e = eMax; |
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} else if (e + eBias >= 1) { |
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m = (value * c - 1) * pow(2, mLen); |
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e = e + eBias; |
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} else { |
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m = value * pow(2, eBias - 1) * pow(2, mLen); |
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e = 0; |
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} |
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} |
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for (; mLen >= 8; buffer[i++] = m & 255, m /= 256, mLen -= 8); |
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e = e << mLen | m; |
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eLen += mLen; |
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for (; eLen > 0; buffer[i++] = e & 255, e /= 256, eLen -= 8); |
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buffer[--i] |= s * 128; |
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return buffer; |
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} |
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function unpackIEEE754(buffer, mLen, nBytes) { |
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var eLen = nBytes * 8 - mLen - 1; |
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var eMax = (1 << eLen) - 1; |
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var eBias = eMax >> 1; |
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var nBits = eLen - 7; |
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var i = nBytes - 1; |
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var s = buffer[i--]; |
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var e = s & 127; |
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var m; |
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s >>= 7; |
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for (; nBits > 0; e = e * 256 + buffer[i], i--, nBits -= 8); |
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m = e & (1 << -nBits) - 1; |
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e >>= -nBits; |
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nBits += mLen; |
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for (; nBits > 0; m = m * 256 + buffer[i], i--, nBits -= 8); |
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if (e === 0) { |
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e = 1 - eBias; |
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} else if (e === eMax) { |
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return m ? NaN : s ? -Infinity : Infinity; |
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} else { |
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m = m + pow(2, mLen); |
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e = e - eBias; |
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} return (s ? -1 : 1) * m * pow(2, e - mLen); |
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} |
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function unpackI32(bytes) { |
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return bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0]; |
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} |
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function packI8(it) { |
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return [it & 0xff]; |
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} |
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function packI16(it) { |
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return [it & 0xff, it >> 8 & 0xff]; |
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} |
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function packI32(it) { |
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return [it & 0xff, it >> 8 & 0xff, it >> 16 & 0xff, it >> 24 & 0xff]; |
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} |
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function packF64(it) { |
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return packIEEE754(it, 52, 8); |
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} |
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function packF32(it) { |
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return packIEEE754(it, 23, 4); |
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} |
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function addGetter(C, key, internal) { |
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dP(C[PROTOTYPE], key, { get: function () { return this[internal]; } }); |
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} |
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function get(view, bytes, index, isLittleEndian) { |
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var numIndex = +index; |
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var intIndex = toIndex(numIndex); |
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if (intIndex + bytes > view[$LENGTH]) throw RangeError(WRONG_INDEX); |
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var store = view[$BUFFER]._b; |
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var start = intIndex + view[$OFFSET]; |
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var pack = store.slice(start, start + bytes); |
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return isLittleEndian ? pack : pack.reverse(); |
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} |
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function set(view, bytes, index, conversion, value, isLittleEndian) { |
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var numIndex = +index; |
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var intIndex = toIndex(numIndex); |
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if (intIndex + bytes > view[$LENGTH]) throw RangeError(WRONG_INDEX); |
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var store = view[$BUFFER]._b; |
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var start = intIndex + view[$OFFSET]; |
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var pack = conversion(+value); |
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for (var i = 0; i < bytes; i++) store[start + i] = pack[isLittleEndian ? i : bytes - i - 1]; |
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} |
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if (!$typed.ABV) { |
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$ArrayBuffer = function ArrayBuffer(length) { |
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anInstance(this, $ArrayBuffer, ARRAY_BUFFER); |
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var byteLength = toIndex(length); |
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this._b = arrayFill.call(new Array(byteLength), 0); |
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this[$LENGTH] = byteLength; |
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}; |
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$DataView = function DataView(buffer, byteOffset, byteLength) { |
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anInstance(this, $DataView, DATA_VIEW); |
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anInstance(buffer, $ArrayBuffer, DATA_VIEW); |
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var bufferLength = buffer[$LENGTH]; |
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var offset = toInteger(byteOffset); |
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if (offset < 0 || offset > bufferLength) throw RangeError('Wrong offset!'); |
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byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength); |
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if (offset + byteLength > bufferLength) throw RangeError(WRONG_LENGTH); |
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this[$BUFFER] = buffer; |
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this[$OFFSET] = offset; |
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this[$LENGTH] = byteLength; |
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}; |
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if (DESCRIPTORS) { |
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addGetter($ArrayBuffer, BYTE_LENGTH, '_l'); |
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addGetter($DataView, BUFFER, '_b'); |
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addGetter($DataView, BYTE_LENGTH, '_l'); |
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addGetter($DataView, BYTE_OFFSET, '_o'); |
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} |
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redefineAll($DataView[PROTOTYPE], { |
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getInt8: function getInt8(byteOffset) { |
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return get(this, 1, byteOffset)[0] << 24 >> 24; |
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}, |
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getUint8: function getUint8(byteOffset) { |
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return get(this, 1, byteOffset)[0]; |
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}, |
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getInt16: function getInt16(byteOffset /* , littleEndian */) { |
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var bytes = get(this, 2, byteOffset, arguments[1]); |
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return (bytes[1] << 8 | bytes[0]) << 16 >> 16; |
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}, |
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getUint16: function getUint16(byteOffset /* , littleEndian */) { |
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var bytes = get(this, 2, byteOffset, arguments[1]); |
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return bytes[1] << 8 | bytes[0]; |
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}, |
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getInt32: function getInt32(byteOffset /* , littleEndian */) { |
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return unpackI32(get(this, 4, byteOffset, arguments[1])); |
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}, |
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getUint32: function getUint32(byteOffset /* , littleEndian */) { |
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return unpackI32(get(this, 4, byteOffset, arguments[1])) >>> 0; |
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}, |
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getFloat32: function getFloat32(byteOffset /* , littleEndian */) { |
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return unpackIEEE754(get(this, 4, byteOffset, arguments[1]), 23, 4); |
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}, |
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getFloat64: function getFloat64(byteOffset /* , littleEndian */) { |
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return unpackIEEE754(get(this, 8, byteOffset, arguments[1]), 52, 8); |
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}, |
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setInt8: function setInt8(byteOffset, value) { |
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set(this, 1, byteOffset, packI8, value); |
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}, |
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setUint8: function setUint8(byteOffset, value) { |
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set(this, 1, byteOffset, packI8, value); |
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}, |
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setInt16: function setInt16(byteOffset, value /* , littleEndian */) { |
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set(this, 2, byteOffset, packI16, value, arguments[2]); |
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}, |
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setUint16: function setUint16(byteOffset, value /* , littleEndian */) { |
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set(this, 2, byteOffset, packI16, value, arguments[2]); |
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}, |
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setInt32: function setInt32(byteOffset, value /* , littleEndian */) { |
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set(this, 4, byteOffset, packI32, value, arguments[2]); |
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}, |
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setUint32: function setUint32(byteOffset, value /* , littleEndian */) { |
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set(this, 4, byteOffset, packI32, value, arguments[2]); |
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}, |
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setFloat32: function setFloat32(byteOffset, value /* , littleEndian */) { |
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set(this, 4, byteOffset, packF32, value, arguments[2]); |
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}, |
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setFloat64: function setFloat64(byteOffset, value /* , littleEndian */) { |
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set(this, 8, byteOffset, packF64, value, arguments[2]); |
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} |
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}); |
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} else { |
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if (!fails(function () { |
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$ArrayBuffer(1); |
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}) || !fails(function () { |
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new $ArrayBuffer(-1); // eslint-disable-line no-new |
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}) || fails(function () { |
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new $ArrayBuffer(); // eslint-disable-line no-new |
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new $ArrayBuffer(1.5); // eslint-disable-line no-new |
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new $ArrayBuffer(NaN); // eslint-disable-line no-new |
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return $ArrayBuffer.name != ARRAY_BUFFER; |
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})) { |
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$ArrayBuffer = function ArrayBuffer(length) { |
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anInstance(this, $ArrayBuffer); |
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return new BaseBuffer(toIndex(length)); |
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}; |
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var ArrayBufferProto = $ArrayBuffer[PROTOTYPE] = BaseBuffer[PROTOTYPE]; |
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for (var keys = gOPN(BaseBuffer), j = 0, key; keys.length > j;) { |
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if (!((key = keys[j++]) in $ArrayBuffer)) hide($ArrayBuffer, key, BaseBuffer[key]); |
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} |
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if (!LIBRARY) ArrayBufferProto.constructor = $ArrayBuffer; |
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} |
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// iOS Safari 7.x bug |
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var view = new $DataView(new $ArrayBuffer(2)); |
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var $setInt8 = $DataView[PROTOTYPE].setInt8; |
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view.setInt8(0, 2147483648); |
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view.setInt8(1, 2147483649); |
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if (view.getInt8(0) || !view.getInt8(1)) redefineAll($DataView[PROTOTYPE], { |
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setInt8: function setInt8(byteOffset, value) { |
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$setInt8.call(this, byteOffset, value << 24 >> 24); |
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}, |
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setUint8: function setUint8(byteOffset, value) { |
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$setInt8.call(this, byteOffset, value << 24 >> 24); |
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} |
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}, true); |
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} |
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setToStringTag($ArrayBuffer, ARRAY_BUFFER); |
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setToStringTag($DataView, DATA_VIEW); |
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hide($DataView[PROTOTYPE], $typed.VIEW, true); |
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exports[ARRAY_BUFFER] = $ArrayBuffer; |
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exports[DATA_VIEW] = $DataView;
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