code: /*
   * Copyright (c) 2017-2018 The Regents of the University of California
   *
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   * 1. Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *
   * 2. Redistributions in binary form must reproduce the above copyright
   * notice, this list of conditions and the following disclaimer in the
   * documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package edu.berkeley.cs.jqf.examples.kaitai;
  
  import java.io.ByteArrayInputStream;
  import java.io.InputStream;
  import java.nio.BufferOverflowException;
  import java.nio.ByteBuffer;
  
  import com.pholser.junit.quickcheck.generator.GenerationStatus;
  import com.pholser.junit.quickcheck.generator.Generator;
  import com.pholser.junit.quickcheck.generator.Size;
  import com.pholser.junit.quickcheck.random.SourceOfRandomness;
  
  /**
   * @author Rohan Padhye
   */
  public abstract class AbstractKaitaiGenerator extends Generator<InputStream> {
  
      public AbstractKaitaiGenerator() {
          super(InputStream.class);
      }
  
      private int capacity = Integer.MAX_VALUE;
      protected ByteBuffer buf;
  
      @SuppressWarnings("unused") // invoked by junit-quickcheck for @Size annotation
      public void configure(Size size) {
          this.capacity = size.max();
      }
  
      @Override
      public InputStream generate(SourceOfRandomness random, GenerationStatus status) {
          buf = ByteBuffer.allocate(this.capacity);
          try {
              // Populate byte buffer
              populate(random);
  
          } catch (BufferOverflowException e) {
              // throw new AssumptionViolatedException("Generated input is too large", e);
          }
  
          // Return the bytes as an inputstream
          int len = buf.position();
          buf.rewind();
          byte[] bytes = new byte[len];
          buf.get(bytes);
          return new ByteArrayInputStream(bytes);
      }
  
  
      abstract protected void populate(SourceOfRandomness random) throws BufferOverflowException;
  }
  