清空

2023-12-13 11:25:22 +08:00
parent 7c2ab0b7ad
commit cff33ad7d1
6370 changed files with 378844 additions and 82245 deletions
@@ -0,0 +1,75 @@
+'use strict';
+var $ = require('../internals/export');
+var global = require('../internals/global');
+var uncurryThis = require('../internals/function-uncurry-this');
+var anObjectOrUndefined = require('../internals/an-object-or-undefined');
+var aString = require('../internals/a-string');
+var hasOwn = require('../internals/has-own-property');
+var arrayFromConstructorAndList = require('../internals/array-from-constructor-and-list');
+var base64Map = require('../internals/base64-map');
+var getAlphabetOption = require('../internals/get-alphabet-option');
+
+var base64Alphabet = base64Map.c2i;
+var base64UrlAlphabet = base64Map.c2iUrl;
+
+var Uint8Array = global.Uint8Array;
+var SyntaxError = global.SyntaxError;
+var charAt = uncurryThis(''.charAt);
+var replace = uncurryThis(''.replace);
+var stringSlice = uncurryThis(''.slice);
+var push = uncurryThis([].push);
+var SPACES = /[\t\n\f\r ]/g;
+var EXTRA_BITS = 'Extra bits';
+
+// `Uint8Array.fromBase64` method
+// https://github.com/tc39/proposal-arraybuffer-base64
+if (Uint8Array) $({ target: 'Uint8Array', stat: true, forced: true }, {
+  fromBase64: function fromBase64(string /* , options */) {
+    aString(string);
+    var options = arguments.length > 1 ? anObjectOrUndefined(arguments[1]) : undefined;
+    var alphabet = getAlphabetOption(options) === 'base64' ? base64Alphabet : base64UrlAlphabet;
+    var strict = options ? !!options.strict : false;
+
+    var input = strict ? string : replace(string, SPACES, '');
+
+    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');
+
+    var lastChunkSize = input.length % 4;
+
+    switch (lastChunkSize) {
+      case 1: throw new SyntaxError('Bad input length');
+      case 2: input += 'AA'; break;
+      case 3: input += 'A';
+    }
+
+    var bytes = [];
+    var i = 0;
+    var inputLength = input.length;
+
+    var at = function (shift) {
+      var chr = charAt(input, i + shift);
+      if (!hasOwn(alphabet, chr)) throw new SyntaxError('Bad char in input: "' + chr + '"');
+      return alphabet[chr] << (18 - 6 * shift);
+    };
+
+    for (; i < inputLength; i += 4) {
+      var triplet = at(0) + at(1) + at(2) + at(3);
+      push(bytes, (triplet >> 16) & 255, (triplet >> 8) & 255, triplet & 255);
+    }
+
+    var byteLength = bytes.length;
+
+    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--;
+    }
+
+    return arrayFromConstructorAndList(Uint8Array, bytes, byteLength);
+  }
+});