react-native/Libraries/Utilities/binaryToBase64.js

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/**
* Copyright (c) 2015-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @format
* @flow
*/
'use strict';
/* $FlowFixMe(>=0.54.0 site=react_native_oss) This comment suppresses an error
* found when Flow v0.54 was deployed. To see the error delete this comment and
* run Flow. */
const base64 = require('base64-js');
function binaryToBase64(data: ArrayBuffer | $ArrayBufferView) {
if (data instanceof ArrayBuffer) {
data = new Uint8Array(data);
}
if (data instanceof Uint8Array) {
return base64.fromByteArray(data);
}
if (!ArrayBuffer.isView(data)) {
throw new Error('data must be ArrayBuffer or typed array');
}
const {buffer, byteOffset, byteLength} = data;
return base64.fromByteArray(new Uint8Array(buffer, byteOffset, byteLength));
}
module.exports = binaryToBase64;