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packages/core-js/internals/array-from-constructor-and-list.js
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70 changes: 67 additions & 3 deletions
70
packages/core-js/modules/esnext.uint8-array.from-base64.js
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Original file line number | Diff line number | Diff line change |
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@@ -1,16 +1,80 @@ | ||
'use strict'; | ||
var $ = require('../internals/export'); | ||
var global = require('../internals/global'); | ||
var uncurryThis = require('../internals/function-uncurry-this'); | ||
var aString = require('../internals/a-string'); | ||
var isObject = require('../internals/is-object'); | ||
var has = require('../internals/has-own-property'); | ||
var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list'); | ||
var base64Map = require('../internals/base64-map'); | ||
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var base64Alphabet = base64Map.c2i; | ||
var base64UrlAlphabet = base64Map.c2iUrl; | ||
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var Uint8Array = global.Uint8Array; | ||
var SyntaxError = global.SyntaxError; | ||
var TypeError = global.TypeError; | ||
var charAt = uncurryThis(''.charAt); | ||
var replace = uncurryThis(''.replace); | ||
var stringSlice = uncurryThis(''.slice); | ||
var push = uncurryThis([].push); | ||
var SPACES = /[\t\n\f\r ]/g; | ||
var BASE64 = 'base64'; | ||
var EXTRA_BITS = 'Extra bits'; | ||
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// `Uint8Array.fromBase64` method | ||
// https://github.com/tc39/proposal-arraybuffer-base64 | ||
if (Uint8Array) $({ target: 'Uint8Array', stat: true, forced: true }, { | ||
fromBase64: function fromBase64(string) { | ||
fromBase64: function fromBase64(string /* , options */) { | ||
aString(string); | ||
// TODO | ||
return new Uint8Array(8); | ||
var options = arguments.length > 1 ? arguments[1] : undefined; | ||
if (options !== undefined && !isObject(options)) throw new TypeError('Incorrect options'); | ||
var $alphabet = options && options.alphabet; | ||
if ($alphabet === undefined) $alphabet = BASE64; | ||
if ($alphabet !== BASE64 && $alphabet !== 'base64url') throw new TypeError('Incorrect `alphabet` option'); | ||
var alphabet = $alphabet === BASE64 ? base64Alphabet : base64UrlAlphabet; | ||
var $strict = options ? !!options.strict : false; | ||
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var input = $strict ? string : replace(string, SPACES, ''); | ||
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if (input.length % 4 === 0) { | ||
if (stringSlice(input, -2) === '==') input = stringSlice(input, 0, -2); | ||
else if (stringSlice(input, -1) === '=') input = stringSlice(input, 0, -1); | ||
} else if ($strict) throw new SyntaxError('Input is not correctly padded'); | ||
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var lastChunkSize = input.length % 4; | ||
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switch (lastChunkSize) { | ||
case 1: throw new SyntaxError('Bad input length'); | ||
case 2: input += 'A'; // break omitted | ||
case 3: input += 'A'; // 'AA' for 2 | ||
} | ||
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var bytes = []; | ||
var i = 0; | ||
var inputLength = input.length; | ||
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var get = function (shift) { | ||
var chr = charAt(input, i + shift); | ||
if (!has(alphabet, chr)) throw new SyntaxError('Bad char in input: "' + chr + '"'); | ||
return alphabet[chr] << (18 - 6 * shift); | ||
}; | ||
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for (; i < inputLength; i += 4) { | ||
var triplet = get(0) + get(1) + get(2) + get(3); | ||
push(bytes, (triplet >> 16) & 255, (triplet >> 8) & 255, triplet & 255); | ||
} | ||
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var byteLength = bytes.length; | ||
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if (lastChunkSize === 2) { | ||
if ($strict && bytes[byteLength - 2] !== 0) throw new SyntaxError(EXTRA_BITS); | ||
byteLength -= 2; | ||
} else if (lastChunkSize === 3) { | ||
if ($strict && bytes[byteLength - 1] !== 0) throw new SyntaxError(EXTRA_BITS); | ||
byteLength--; | ||
} | ||
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return arrayFromConstructorAndList(Uint8Array, bytes, byteLength); | ||
} | ||
}); |
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