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2023-12-13 11:25:22 +08:00
parent 7c2ab0b7ad
commit cff33ad7d1
6370 changed files with 378844 additions and 82245 deletions
@@ -0,0 +1,47 @@
+'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 anUint8Array = require('../internals/an-uint8-array');
+var base64Map = require('../internals/base64-map');
+var getAlphabetOption = require('../internals/get-alphabet-option');
+
+var base64Alphabet = base64Map.i2c;
+var base64UrlAlphabet = base64Map.i2cUrl;
+
+var Uint8Array = global.Uint8Array;
+var charAt = uncurryThis(''.charAt);
+
+// `Uint8Array.prototype.toBase64` method
+// https://github.com/tc39/proposal-arraybuffer-base64
+if (Uint8Array) $({ target: 'Uint8Array', proto: true, forced: true }, {
+  toBase64: function toBase64(/* options */) {
+    var array = anUint8Array(this);
+    var options = arguments.length ? anObjectOrUndefined(arguments[0]) : undefined;
+    var alphabet = getAlphabetOption(options) === 'base64' ? base64Alphabet : base64UrlAlphabet;
+
+    var result = '';
+    var i = 0;
+    var length = array.length;
+    var triplet;
+
+    var at = function (shift) {
+      return charAt(alphabet, (triplet >> (6 * shift)) & 63);
+    };
+
+    for (; i + 2 < length; i += 3) {
+      triplet = (array[i] << 16) + (array[i + 1] << 8) + array[i + 2];
+      result += at(3) + at(2) + at(1) + at(0);
+    }
+    if (i + 2 === length) {
+      triplet = (array[i] << 16) + (array[i + 1] << 8);
+      result += at(3) + at(2) + at(1) + '=';
+    } else if (i + 1 === length) {
+      triplet = array[i] << 16;
+      result += at(3) + at(2) + '==';
+    }
+
+    return result;
+  }
+});