| 'use strict'; |
| var global = require('../internals/global'); |
| var DESCRIPTORS = require('../internals/descriptors'); |
| var NATIVE_ARRAY_BUFFER = require('../internals/array-buffer-view-core').NATIVE_ARRAY_BUFFER; |
| var createNonEnumerableProperty = require('../internals/create-non-enumerable-property'); |
| var redefineAll = require('../internals/redefine-all'); |
| var fails = require('../internals/fails'); |
| var anInstance = require('../internals/an-instance'); |
| var toInteger = require('../internals/to-integer'); |
| var toLength = require('../internals/to-length'); |
| var toIndex = require('../internals/to-index'); |
| var getOwnPropertyNames = require('../internals/object-get-own-property-names').f; |
| var defineProperty = require('../internals/object-define-property').f; |
| var arrayFill = require('../internals/array-fill'); |
| var setToStringTag = require('../internals/set-to-string-tag'); |
| var InternalStateModule = require('../internals/internal-state'); |
| |
| var getInternalState = InternalStateModule.get; |
| var setInternalState = InternalStateModule.set; |
| var ARRAY_BUFFER = 'ArrayBuffer'; |
| var DATA_VIEW = 'DataView'; |
| var PROTOTYPE = 'prototype'; |
| var WRONG_LENGTH = 'Wrong length'; |
| var WRONG_INDEX = 'Wrong index'; |
| var NativeArrayBuffer = global[ARRAY_BUFFER]; |
| var $ArrayBuffer = NativeArrayBuffer; |
| var $DataView = global[DATA_VIEW]; |
| var Math = global.Math; |
| var RangeError = global.RangeError; |
| // eslint-disable-next-line no-shadow-restricted-names |
| var Infinity = 1 / 0; |
| var abs = Math.abs; |
| var pow = Math.pow; |
| var floor = Math.floor; |
| var log = Math.log; |
| var LN2 = Math.LN2; |
| |
| // IEEE754 conversions based on https://github.com/feross/ieee754 |
| var packIEEE754 = function (number, mantissaLength, bytes) { |
| var buffer = new Array(bytes); |
| var exponentLength = bytes * 8 - mantissaLength - 1; |
| var eMax = (1 << exponentLength) - 1; |
| var eBias = eMax >> 1; |
| var rt = mantissaLength === 23 ? pow(2, -24) - pow(2, -77) : 0; |
| var sign = number < 0 || number === 0 && 1 / number < 0 ? 1 : 0; |
| var index = 0; |
| var exponent, mantissa, c; |
| number = abs(number); |
| // eslint-disable-next-line no-self-compare |
| if (number != number || number === Infinity) { |
| // eslint-disable-next-line no-self-compare |
| mantissa = number != number ? 1 : 0; |
| exponent = eMax; |
| } else { |
| exponent = floor(log(number) / LN2); |
| if (number * (c = pow(2, -exponent)) < 1) { |
| exponent--; |
| c *= 2; |
| } |
| if (exponent + eBias >= 1) { |
| number += rt / c; |
| } else { |
| number += rt * pow(2, 1 - eBias); |
| } |
| if (number * c >= 2) { |
| exponent++; |
| c /= 2; |
| } |
| if (exponent + eBias >= eMax) { |
| mantissa = 0; |
| exponent = eMax; |
| } else if (exponent + eBias >= 1) { |
| mantissa = (number * c - 1) * pow(2, mantissaLength); |
| exponent = exponent + eBias; |
| } else { |
| mantissa = number * pow(2, eBias - 1) * pow(2, mantissaLength); |
| exponent = 0; |
| } |
| } |
| for (; mantissaLength >= 8; buffer[index++] = mantissa & 255, mantissa /= 256, mantissaLength -= 8); |
| exponent = exponent << mantissaLength | mantissa; |
| exponentLength += mantissaLength; |
| for (; exponentLength > 0; buffer[index++] = exponent & 255, exponent /= 256, exponentLength -= 8); |
| buffer[--index] |= sign * 128; |
| return buffer; |
| }; |
| |
| var unpackIEEE754 = function (buffer, mantissaLength) { |
| var bytes = buffer.length; |
| var exponentLength = bytes * 8 - mantissaLength - 1; |
| var eMax = (1 << exponentLength) - 1; |
| var eBias = eMax >> 1; |
| var nBits = exponentLength - 7; |
| var index = bytes - 1; |
| var sign = buffer[index--]; |
| var exponent = sign & 127; |
| var mantissa; |
| sign >>= 7; |
| for (; nBits > 0; exponent = exponent * 256 + buffer[index], index--, nBits -= 8); |
| mantissa = exponent & (1 << -nBits) - 1; |
| exponent >>= -nBits; |
| nBits += mantissaLength; |
| for (; nBits > 0; mantissa = mantissa * 256 + buffer[index], index--, nBits -= 8); |
| if (exponent === 0) { |
| exponent = 1 - eBias; |
| } else if (exponent === eMax) { |
| return mantissa ? NaN : sign ? -Infinity : Infinity; |
| } else { |
| mantissa = mantissa + pow(2, mantissaLength); |
| exponent = exponent - eBias; |
| } return (sign ? -1 : 1) * mantissa * pow(2, exponent - mantissaLength); |
| }; |
| |
| var unpackInt32 = function (buffer) { |
| return buffer[3] << 24 | buffer[2] << 16 | buffer[1] << 8 | buffer[0]; |
| }; |
| |
| var packInt8 = function (number) { |
| return [number & 0xFF]; |
| }; |
| |
| var packInt16 = function (number) { |
| return [number & 0xFF, number >> 8 & 0xFF]; |
| }; |
| |
| var packInt32 = function (number) { |
| return [number & 0xFF, number >> 8 & 0xFF, number >> 16 & 0xFF, number >> 24 & 0xFF]; |
| }; |
| |
| var packFloat32 = function (number) { |
| return packIEEE754(number, 23, 4); |
| }; |
| |
| var packFloat64 = function (number) { |
| return packIEEE754(number, 52, 8); |
| }; |
| |
| var addGetter = function (Constructor, key) { |
| defineProperty(Constructor[PROTOTYPE], key, { get: function () { return getInternalState(this)[key]; } }); |
| }; |
| |
| var get = function (view, count, index, isLittleEndian) { |
| var numIndex = +index; |
| var intIndex = toIndex(numIndex); |
| var store = getInternalState(view); |
| if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX); |
| var bytes = getInternalState(store.buffer).bytes; |
| var start = intIndex + store.byteOffset; |
| var pack = bytes.slice(start, start + count); |
| return isLittleEndian ? pack : pack.reverse(); |
| }; |
| |
| var set = function (view, count, index, conversion, value, isLittleEndian) { |
| var numIndex = +index; |
| var intIndex = toIndex(numIndex); |
| var store = getInternalState(view); |
| if (intIndex + count > store.byteLength) throw RangeError(WRONG_INDEX); |
| var bytes = getInternalState(store.buffer).bytes; |
| var start = intIndex + store.byteOffset; |
| var pack = conversion(+value); |
| for (var i = 0; i < count; i++) bytes[start + i] = pack[isLittleEndian ? i : count - i - 1]; |
| }; |
| |
| if (!NATIVE_ARRAY_BUFFER) { |
| $ArrayBuffer = function ArrayBuffer(length) { |
| anInstance(this, $ArrayBuffer, ARRAY_BUFFER); |
| var byteLength = toIndex(length); |
| setInternalState(this, { |
| bytes: arrayFill.call(new Array(byteLength), 0), |
| byteLength: byteLength |
| }); |
| if (!DESCRIPTORS) this.byteLength = byteLength; |
| }; |
| |
| $DataView = function DataView(buffer, byteOffset, byteLength) { |
| anInstance(this, $DataView, DATA_VIEW); |
| anInstance(buffer, $ArrayBuffer, DATA_VIEW); |
| var bufferLength = getInternalState(buffer).byteLength; |
| var offset = toInteger(byteOffset); |
| if (offset < 0 || offset > bufferLength) throw RangeError('Wrong offset'); |
| byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength); |
| if (offset + byteLength > bufferLength) throw RangeError(WRONG_LENGTH); |
| setInternalState(this, { |
| buffer: buffer, |
| byteLength: byteLength, |
| byteOffset: offset |
| }); |
| if (!DESCRIPTORS) { |
| this.buffer = buffer; |
| this.byteLength = byteLength; |
| this.byteOffset = offset; |
| } |
| }; |
| |
| if (DESCRIPTORS) { |
| addGetter($ArrayBuffer, 'byteLength'); |
| addGetter($DataView, 'buffer'); |
| addGetter($DataView, 'byteLength'); |
| addGetter($DataView, 'byteOffset'); |
| } |
| |
| redefineAll($DataView[PROTOTYPE], { |
| getInt8: function getInt8(byteOffset) { |
| return get(this, 1, byteOffset)[0] << 24 >> 24; |
| }, |
| getUint8: function getUint8(byteOffset) { |
| return get(this, 1, byteOffset)[0]; |
| }, |
| getInt16: function getInt16(byteOffset /* , littleEndian */) { |
| var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined); |
| return (bytes[1] << 8 | bytes[0]) << 16 >> 16; |
| }, |
| getUint16: function getUint16(byteOffset /* , littleEndian */) { |
| var bytes = get(this, 2, byteOffset, arguments.length > 1 ? arguments[1] : undefined); |
| return bytes[1] << 8 | bytes[0]; |
| }, |
| getInt32: function getInt32(byteOffset /* , littleEndian */) { |
| return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined)); |
| }, |
| getUint32: function getUint32(byteOffset /* , littleEndian */) { |
| return unpackInt32(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined)) >>> 0; |
| }, |
| getFloat32: function getFloat32(byteOffset /* , littleEndian */) { |
| return unpackIEEE754(get(this, 4, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 23); |
| }, |
| getFloat64: function getFloat64(byteOffset /* , littleEndian */) { |
| return unpackIEEE754(get(this, 8, byteOffset, arguments.length > 1 ? arguments[1] : undefined), 52); |
| }, |
| setInt8: function setInt8(byteOffset, value) { |
| set(this, 1, byteOffset, packInt8, value); |
| }, |
| setUint8: function setUint8(byteOffset, value) { |
| set(this, 1, byteOffset, packInt8, value); |
| }, |
| setInt16: function setInt16(byteOffset, value /* , littleEndian */) { |
| set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined); |
| }, |
| setUint16: function setUint16(byteOffset, value /* , littleEndian */) { |
| set(this, 2, byteOffset, packInt16, value, arguments.length > 2 ? arguments[2] : undefined); |
| }, |
| setInt32: function setInt32(byteOffset, value /* , littleEndian */) { |
| set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined); |
| }, |
| setUint32: function setUint32(byteOffset, value /* , littleEndian */) { |
| set(this, 4, byteOffset, packInt32, value, arguments.length > 2 ? arguments[2] : undefined); |
| }, |
| setFloat32: function setFloat32(byteOffset, value /* , littleEndian */) { |
| set(this, 4, byteOffset, packFloat32, value, arguments.length > 2 ? arguments[2] : undefined); |
| }, |
| setFloat64: function setFloat64(byteOffset, value /* , littleEndian */) { |
| set(this, 8, byteOffset, packFloat64, value, arguments.length > 2 ? arguments[2] : undefined); |
| } |
| }); |
| } else { |
| if (!fails(function () { |
| NativeArrayBuffer(1); |
| }) || !fails(function () { |
| new NativeArrayBuffer(-1); // eslint-disable-line no-new |
| }) || fails(function () { |
| new NativeArrayBuffer(); // eslint-disable-line no-new |
| new NativeArrayBuffer(1.5); // eslint-disable-line no-new |
| new NativeArrayBuffer(NaN); // eslint-disable-line no-new |
| return NativeArrayBuffer.name != ARRAY_BUFFER; |
| })) { |
| $ArrayBuffer = function ArrayBuffer(length) { |
| anInstance(this, $ArrayBuffer); |
| return new NativeArrayBuffer(toIndex(length)); |
| }; |
| var ArrayBufferPrototype = $ArrayBuffer[PROTOTYPE] = NativeArrayBuffer[PROTOTYPE]; |
| for (var keys = getOwnPropertyNames(NativeArrayBuffer), j = 0, key; keys.length > j;) { |
| if (!((key = keys[j++]) in $ArrayBuffer)) { |
| createNonEnumerableProperty($ArrayBuffer, key, NativeArrayBuffer[key]); |
| } |
| } |
| ArrayBufferPrototype.constructor = $ArrayBuffer; |
| } |
| // iOS Safari 7.x bug |
| var testView = new $DataView(new $ArrayBuffer(2)); |
| var nativeSetInt8 = $DataView[PROTOTYPE].setInt8; |
| testView.setInt8(0, 2147483648); |
| testView.setInt8(1, 2147483649); |
| if (testView.getInt8(0) || !testView.getInt8(1)) redefineAll($DataView[PROTOTYPE], { |
| setInt8: function setInt8(byteOffset, value) { |
| nativeSetInt8.call(this, byteOffset, value << 24 >> 24); |
| }, |
| setUint8: function setUint8(byteOffset, value) { |
| nativeSetInt8.call(this, byteOffset, value << 24 >> 24); |
| } |
| }, { unsafe: true }); |
| } |
| |
| setToStringTag($ArrayBuffer, ARRAY_BUFFER); |
| setToStringTag($DataView, DATA_VIEW); |
| |
| module.exports = { |
| ArrayBuffer: $ArrayBuffer, |
| DataView: $DataView |
| }; |