1/* 2 * Copyright (C) 2023 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17import {ArrayUtils} from 'common/array_utils'; 18 19export class ParsingUtils { 20 static throwIfMagicNumberDoesNotMatch( 21 traceBuffer: Uint8Array, 22 magicNumber: number[] | undefined, 23 ) { 24 if (magicNumber !== undefined) { 25 const bufferContainsMagicNumber = ArrayUtils.equal( 26 magicNumber, 27 traceBuffer.slice(0, magicNumber.length), 28 ); 29 if (!bufferContainsMagicNumber) { 30 throw new TypeError("buffer doesn't contain expected magic number"); 31 } 32 } 33 } 34} 35