/*
 * Copyright (C) 2023 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {ArrayUtils} from 'common/array_utils';

export class ParsingUtils {
  static throwIfMagicNumberDoesNotMatch(
    traceBuffer: Uint8Array,
    magicNumber: number[] | undefined,
  ) {
    if (magicNumber !== undefined) {
      const bufferContainsMagicNumber = ArrayUtils.equal(
        magicNumber,
        traceBuffer.slice(0, magicNumber.length),
      );
      if (!bufferContainsMagicNumber) {
        throw new TypeError("buffer doesn't contain expected magic number");
      }
    }
  }
}