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/*
* Copyright (c) 2019, 2024, 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.
*/
import jdk.internal.util.ArraysSupport;
import org.junit.jupiter.api.Test;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Base64;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.fail;
/*
* @test
* @bug 8210583 8217969 8218265 8295153
* @summary White-box test that effectively checks Base64.Encoder.encode and
* Base64.Decoder.decode behavior with large, (Integer.MAX_VALUE) sized
* input array/buffer. Tests the private methods "encodedOutLength" and
* "decodedOutLength".
* @modules java.base/jdk.internal.util
* @run junit/othervm --add-opens java.base/java.util=ALL-UNNAMED TestEncodingDecodingLength
*/
// We perform a white-box test due to the heavy memory usage that testing
// the public API would require which has shown to cause intermittent issues
public class TestEncodingDecodingLength {
// A value large enough to test the desired memory conditions in encode and decode
private static final int LARGE_MEM_SIZE = ArraysSupport.SOFT_MAX_ARRAY_LENGTH;
private static final Base64.Decoder DECODER = Base64.getDecoder();
private static final Base64.Encoder ENCODER = Base64.getEncoder();
// Effectively tests that encode(byte[] src, byte[] dst) throws an
// IllegalArgumentException with array sized near Integer.MAX_VALUE. All the
// encode() methods call encodedOutLength(), which is where the OOME is expected
@Test
public void largeEncodeIAETest() throws IllegalAccessException,
InvocationTargetException, NoSuchMethodException {
Method m = getMethod(ENCODER,
"encodedOutLength", int.class, boolean.class);
// When throwOOME param is false, encodedOutLength should return -1 in
// this situation, which encode() uses to throw IAE
assertEquals(-1, m.invoke(ENCODER, LARGE_MEM_SIZE, false));
}
// Effectively tests that the overloaded encode() and encodeToString() methods
// throw OutOfMemoryError with array/buffer sized near Integer.MAX_VALUE
@Test
public void largeEncodeOOMETest() throws IllegalAccessException, NoSuchMethodException {
Method m = getMethod(ENCODER,
"encodedOutLength", int.class, boolean.class);
try {
m.invoke(ENCODER, LARGE_MEM_SIZE, true);
} catch (InvocationTargetException ex) {
Throwable rootEx = ex.getCause();
assertEquals(OutOfMemoryError.class, rootEx.getClass(),
"OOME should be thrown with Integer.MAX_VALUE input");
assertEquals("Encoded size is too large", rootEx.getMessage());
}
}
// Effectively tests that the overloaded decode() methods do not throw
// OOME nor NASE with array/buffer sized near Integer.MAX_VALUE All the decode
// methods call decodedOutLength(), which is where the previously thrown
// OOME or NASE would occur at.
@Test
public void largeDecodeTest() throws IllegalAccessException, NoSuchMethodException {
Method m = getMethod(DECODER,
"decodedOutLength", byte[].class, int.class, int.class);
byte[] src = {1};
try {
/*
decodedOutLength() takes the src array, position, and limit as params.
The src array will be indexed at limit-1 to search for padding.
To avoid passing an array with Integer.MAX_VALUE memory allocated, we
set position param to be -size. Since the initial length
is calculated as limit - position. This mocks the potential overflow
calculation and still allows the array to be indexed without an AIOBE.
*/
m.invoke(DECODER, src, -LARGE_MEM_SIZE + 1, 1);
} catch (InvocationTargetException ex) {
// 8210583 - decode no longer throws NASE
// 8217969 - decode no longer throws OOME
fail("Decode threw an unexpected exception with " +
"Integer.MAX_VALUE sized input: " + ex.getCause());
}
}
// Utility to get the private visibility method
private static Method getMethod(Object obj, String methodName, Class<?>... params)
throws NoSuchMethodException {
Method m = obj.getClass().getDeclaredMethod(methodName, params);
m.setAccessible(true);
return m;
}
}
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