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/*
* Copyright (c) 2005, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8282252
* @summary Verify BigInteger objects are serialized properly.
*/
import java.math.*;
import java.io.*;
import java.util.Arrays;
import java.util.List;
public class SerializationTests {
public static void main(String... args) throws Exception {
checkBigIntegerSerialRoundTrip();
checkBigIntegerSubSerialRoundTrip();
}
private static void checkSerialForm(BigInteger bi) throws Exception {
checkSerialForm0(bi);
checkSerialForm0(bi.negate());
}
private static void checkSerialForm0(BigInteger bi) throws Exception {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
try(ObjectOutputStream oos = new ObjectOutputStream(bos)) {
oos.writeObject(bi);
oos.flush();
}
ObjectInputStream ois = new
ObjectInputStream(new ByteArrayInputStream(bos.toByteArray()));
BigInteger tmp = (BigInteger)ois.readObject();
if (!bi.equals(tmp) ||
bi.hashCode() != tmp.hashCode() ||
bi.getClass() != tmp.getClass() ||
// For extra measure, directly test equality of components
bi.signum() != tmp.signum() ||
!Arrays.equals(bi.toByteArray(), (tmp.toByteArray())) ) {
System.err.print(" original : " + bi);
System.err.println(" (hash: 0x" + Integer.toHexString(bi.hashCode()) + ")");
System.err.print("serialized : " + tmp);
System.err.println(" (hash: 0x" + Integer.toHexString(tmp.hashCode()) + ")");
throw new RuntimeException("Bad serial roundtrip");
}
}
private static void checkBigIntegerSerialRoundTrip() throws Exception {
var values =
List.of(BigInteger.ZERO,
BigInteger.ONE,
BigInteger.TWO,
BigInteger.TEN,
BigInteger.valueOf(100),
BigInteger.valueOf(Integer.MAX_VALUE),
BigInteger.valueOf(Long.MAX_VALUE-1),
new BigInteger("9223372036854775808")); // Long.MAX_VALUE + 1
for(BigInteger value : values) {
checkSerialForm(value);
}
}
// Subclass with specialized toString output
private static class BigIntegerSub extends BigInteger {
public BigIntegerSub(BigInteger bi) {
super(bi.toByteArray());
}
@Override
public String toString() {
return Arrays.toString(toByteArray());
}
}
// Subclass defining a serialVersionUID
private static class BigIntegerSubSVUID extends BigInteger {
@java.io.Serial
private static long serialVesionUID = 0x0123_4567_89ab_cdefL;
public BigIntegerSubSVUID(BigInteger bi) {
super(bi.toByteArray());
}
@Override
public String toString() {
return Arrays.toString(toByteArray());
}
}
// Subclass defining writeReplace
private static class BigIntegerSubWR extends BigInteger {
public BigIntegerSubWR(BigInteger bi) {
super(bi.toByteArray());
}
// Just return this; could use a serial proxy instead
@java.io.Serial
private Object writeReplace() throws ObjectStreamException {
return this;
}
}
private static void checkBigIntegerSubSerialRoundTrip() throws Exception {
var values = List.of(BigInteger.ZERO,
BigInteger.ONE,
BigInteger.TEN,
new BigInteger("9223372036854775808")); // Long.MAX_VALUE + 1
for(var value : values) {
checkSerialForm(new BigIntegerSub(value));
checkSerialForm(new BigIntegerSubSVUID(value));
checkSerialForm(new BigIntegerSubWR(value));
}
}
}
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