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JQF: Feedback-directed Quickcheck for Java - Sample generators and benchmark tests
/*
* 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,
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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 {
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;
}