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