1// Copyright (C) 2019 The Android Open Source Project 2// 3// Licensed under the Apache License, Version 2.0 (the "License"); 4// you may not use this file except in compliance with the License. 5// You may obtain a copy of the License at 6// 7// http://www.apache.org/licenses/LICENSE-2.0 8// 9// Unless required by applicable law or agreed to in writing, software 10// distributed under the License is distributed on an "AS IS" BASIS, 11// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12// See the License for the specific language governing permissions and 13// limitations under the License. 14 15export function uint8ArrayToBase64(buffer: Uint8Array): string { 16 return btoa(uint8ArrayToString(buffer)); 17} 18 19// This function will not handle correctly buffers with a large number of 20// elements due to a js limitation on the number of arguments of a function. 21// The apply will in fact do a call like 22// 'String.fromCharCode(buffer[0],buffer[1],...)'. 23export function uint8ArrayToString(buffer: Uint8Array): string { 24 return String.fromCharCode.apply(null, Array.from(buffer)); 25} 26 27export function stringToUint8Array(str: string): Uint8Array { 28 const bufView = new Uint8Array(new ArrayBuffer(str.length)); 29 const strLen = str.length; 30 for (let i = 0; i < strLen; i++) { 31 bufView[i] = str.charCodeAt(i); 32 } 33 return bufView; 34}