content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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.
   */
  package org.apache.beam.runners.dataflow.worker;
  
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.ByteString;
  import org.apache.beam.vendor.grpc.v1p69p0.com.google.protobuf.UnsafeByteOperations;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.primitives.Ints;
  
  class ByteArrayReader {
  
    private final byte[] arr;
    private int pos;
  
    public ByteArrayReader(byte[] arr) {
      this.arr = arr;
      this.pos = 0;
    }
  
    public int available() {
      return arr.length - pos;
    }
  
    public int readInt() {
      int ret = Ints.fromBytes(arr[pos], arr[pos + 1], arr[pos + 2], arr[pos + 3]);
      pos += 4;
      return ret;
    }
  
    public ByteString read(int size) {
      if (size == 0) {
        return ByteString.EMPTY;
      }
  
      ByteString ret = UnsafeByteOperations.unsafeWrap(arr, pos, size);
      pos += size;
      return ret;
    }
  }
  