edu.berkeley.cs.jqf.fuzz.junit.quickcheck.InputStreamGenerator Maven / Gradle / Ivy
/*
* 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
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package edu.berkeley.cs.jqf.fuzz.junit.quickcheck;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import com.pholser.junit.quickcheck.generator.GenerationStatus;
import com.pholser.junit.quickcheck.generator.Generator;
import com.pholser.junit.quickcheck.random.SourceOfRandomness;
/**
* Lazy provider of bytes from an input stream. This is useful
* when you want the parameter sequence to be exactly equal to
* the raw input, such as when fuzzing with AFL.
*
* Use this only with AFL-like front-ends, which return
* bytes from a fixed-size file. This generator may not work
* properly with front-ends like Zest that generate fresh
* values at the end of a parameter sequence, since that would
* make the InputStream infinitely long.
*
* @author Rohan Padhye
*/
public class InputStreamGenerator extends Generator {
public InputStreamGenerator() {
super(InputStream.class);
}
@Override
public InputStream generate(SourceOfRandomness sourceOfRandomness, GenerationStatus generationStatus) {
return new InputStream() {
@Override
public int read() throws IOException {
// Keep asking for new random bytes until the
// SourceOfRandomness runs out of parameters. This is designed
// to work with fixed-size parameter sequences, such as when
// fuzzing with AFL.
try {
byte nextByte = sourceOfRandomness.nextByte(Byte.MIN_VALUE, Byte.MAX_VALUE);
int nextInt = nextByte & 0xFF;
return nextInt;
} catch (IllegalStateException e) {
if (e.getCause() instanceof EOFException) {
return -1;
} else {
throw e;
}
}
}
};
}
}