// The MIT License (MIT)

//

// Copyright (c) 2017 Robert C. Seacord

//

// Permission is hereby granted, free of charge, to any person obtaining a copy

// of this software and associated documentation files (the "Software"), to deal

// in the Software without restriction, including without limitation the rights

// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

// copies of the Software, and to permit persons to whom the Software is

// furnished to do so, subject to the following conditions:

//

// The above copyright notice and this permission notice shall be included in all

// copies or substantial portions of the Software.

//

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

// SOFTWARE.

package ser08j;

import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.Date;

public class MutablePeriod {

// A period instance

private Period period;

// period's start field, to which we shouldn't have access

private Date start;

// period's end field, to which we shouldn't have access

private Date end;

public MutablePeriod() {

try (ByteArrayOutputStream baos = new ByteArrayOutputStream();

ObjectOutputStream oos = new ObjectOutputStream(baos)) {

// Serialize a valid Period instance

oos.writeObject(new Period(new Date(), new Date()));

// Append rogue previous object references for internal Date fields in Period.

byte[] ref = { 0x71, 0x00, 0x7e, 0x00, 0x05 }; // Reference #5

baos.write(ref); // The start field

ref[4] = 0x04; // Reference # 4

baos.write(ref); // The end field

try (ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(baos.toByteArray()))) {

// Deserialize Period and "stolen" Date references

this.period = (Period) ois.readObject();

this.start = (Date) ois.readObject();

this.end = (Date) ois.readObject();

} catch (ClassNotFoundException | IOException e) {

e.printStackTrace();

}

} // end try-with-resources

catch (IOException e1) {

e1.printStackTrace();

}

} // end MutablePeriod constructor

@SuppressWarnings("deprecation")

public static void main(String[] args) {

MutablePeriod mp = new MutablePeriod();

Period p = mp.period;

Date pEnd = mp.end;

// Let's turn back the clock

pEnd.setYear(78);

System.out.println(p);

// Bring back the 60s!

pEnd.setYear(69);

System.out.println(p);

}

}