russell@unturf.com
0a580b313d
Authors: russell@unturf.com · brackishbert@gmail.com · foxhop.net · TimeHexOn.com Patches, unit tests, benchmarks, whitepaper, and outreach briefs. Public domain — no copyright claimed. Use freely.
71 lines
2.7 KiB
Java
71 lines
2.7 KiB
Java
/*
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* Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 4260284 8219196 8223254
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* @summary Test if DataOutputStream will overcount written field.
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* @requires (sun.arch.data.model == "64" & os.maxMemory >= 4g)
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* @run junit/othervm -Xmx4g WriteUTF
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*/
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import java.io.ByteArrayOutputStream;
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import java.io.DataOutputStream;
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import java.io.IOException;
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import java.io.UTFDataFormatException;
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import org.junit.jupiter.api.Test;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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public class WriteUTF {
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@Test
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public void overcountWrittenField() throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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DataOutputStream dos = new DataOutputStream(baos);
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dos.writeUTF("Hello, World!"); // 15
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dos.flush();
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if (baos.size() != dos.size())
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throw new RuntimeException("Miscounted bytes in DataOutputStream.");
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}
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private static void writeUTF(int size) throws IOException {
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// this character gives 3 bytes when encoded using UTF-8
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String s = "\u0800".repeat(size);
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ByteArrayOutputStream bos = new ByteArrayOutputStream();
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DataOutputStream dos = new DataOutputStream(bos);
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dos.writeUTF(s);
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}
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@Test
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public void utfDataFormatException() throws IOException {
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assertThrows(UTFDataFormatException.class, () -> writeUTF(1 << 16));
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}
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// Without 8219196 fix, throws ArrayIndexOutOfBoundsException instead of
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// expected UTFDataFormatException. Requires 4GB of heap (-Xmx4g) to run
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// without throwing an OutOfMemoryError.
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@Test
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public void arrayIndexOutOfBoundsException() throws IOException {
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assertThrows(UTFDataFormatException.class, () -> writeUTF(Integer.MAX_VALUE / 3 + 1));
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}
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}
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