undefect. CWE-407 — 63 sites patched across 27 ecosystems
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.
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test/jdk/java/io/Reader/Of.java
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test/jdk/java/io/Reader/Of.java
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/*
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* Copyright (c) 2024, 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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import java.io.Reader;
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import java.io.StringReader;
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import java.io.IOException;
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import java.io.StringWriter;
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import java.nio.ByteBuffer;
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import java.nio.CharBuffer;
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import java.nio.ReadOnlyBufferException;
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import org.junit.jupiter.params.ParameterizedTest;
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import org.junit.jupiter.params.provider.MethodSource;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import static org.junit.jupiter.api.Assertions.assertTrue;
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/*
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* @test
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* @bug 8341566
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* @summary Check for expected behavior of Reader.of().
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* @run junit Of
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*/
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public class Of {
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final static String CONTENT = "Some Reader Test";
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/*
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* Readers to be tested.
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*/
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public static Reader[] readers() {
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return new Reader[] {
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new StringReader(CONTENT),
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Reader.of(CONTENT),
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Reader.of(new StringBuffer(CONTENT)),
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Reader.of(new StringBuilder(CONTENT)),
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Reader.of(ByteBuffer.allocateDirect(CONTENT.length() * 2)
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.asCharBuffer().put(CONTENT).flip()),
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Reader.of(CharBuffer.wrap(CONTENT.toCharArray())),
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Reader.of(new CharSequence() {
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@Override
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public char charAt(int index) {
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return CONTENT.charAt(index);
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}
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@Override
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public int length() {
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return CONTENT.length();
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}
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@Override
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public CharSequence subSequence(int start, int end) {
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// unused by Reader.Of's result
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throw new UnsupportedOperationException();
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}
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@Override
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public String toString() {
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// Reader.Of's result SHALL NOT convert to String
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throw new UnsupportedOperationException();
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}
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})
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};
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testRead(Reader reader) throws IOException {
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String s = "";
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for (int c; (c = reader.read()) != -1; s += (char) c);
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assertEquals(CONTENT, s, "read() returned wrong value");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadBII(Reader reader) throws IOException {
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char[] c = new char[16];
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assertEquals(8, reader.read(c, 8, 8),
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"read(char[],int,int) does not respect given start or end");
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assertEquals(8, reader.read(c, 0, 16),
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"read(char[],int,int) does not respect end of stream");
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assertEquals(CONTENT.substring(8, 16) + CONTENT.substring(0, 8),
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new String(c),
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"read(char[],int,int) provides wrong content");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadBIILenZero(Reader reader) throws IOException {
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assertEquals(0, reader.read(new char[1], 0, 0),
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"read(char[],int,int) != 0");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadDirectCharBuffer(Reader reader) throws IOException {
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CharBuffer charBuffer = ByteBuffer.allocateDirect(32).asCharBuffer();
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charBuffer.position(8);
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assertEquals(8, reader.read(charBuffer),
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"read(CharBuffer) does not respect position or limit");
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charBuffer.rewind();
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assertEquals(8, reader.read(charBuffer),
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"read(CharBuffer) does not respect end of stream");
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charBuffer.rewind();
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// last part first proves that copy loops correctly stopped
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assertEquals(CONTENT.substring(8, 16) + CONTENT.substring(0, 8),
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charBuffer.toString(),
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"read(CharBuffer) provides wrong content");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadNonDirectCharBuffer(Reader reader) throws IOException {
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CharBuffer charBuffer = CharBuffer.allocate(16);
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charBuffer.position(8);
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assertEquals(8, reader.read(charBuffer),
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"read(CharBuffer) does not respect position or limit");
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charBuffer.rewind();
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assertEquals(8, reader.read(charBuffer),
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"read(CharBuffer) does not respect end of stream");
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charBuffer.rewind();
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assertEquals(CONTENT.substring(8, 16) + CONTENT.substring(0, 8),
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charBuffer.toString(),
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"read(CharBuffer) provides wrong content");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadCharBufferZeroRemaining(Reader reader) throws IOException {
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CharBuffer charBuffer = CharBuffer.allocate(0);
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assertEquals(0, reader.read(charBuffer), "read(CharBuffer) != 0");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReady(Reader reader) throws IOException {
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assertTrue(reader.ready());
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testSkip(Reader reader) throws IOException {
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assertEquals(8, reader.skip(8), "skip() does not respect limit");
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assertEquals(8, reader.skip(9), "skip() does not respect end of stream");
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assertEquals(0, reader.skip(1), "skip() does not respect empty stream");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testTransferTo(Reader reader) throws IOException {
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StringWriter sw = new StringWriter(16);
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assertEquals(16, reader.transferTo(sw), "transferTo() != 16");
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assertEquals(0, reader.transferTo(sw),
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"transferTo() does not respect empty stream");
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assertEquals(CONTENT, sw.toString(),
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"transferTo() provides wrong content");
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadClosed(Reader reader) throws IOException {
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reader.close();
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assertThrows(IOException.class, () -> {reader.read();});
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadBIIClosed(Reader reader) throws IOException {
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reader.close();
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assertThrows(IOException.class, () -> reader.read(new char[1], 0, 1));
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadCharBufferClosed(Reader reader) throws IOException {
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CharBuffer charBuffer = CharBuffer.allocate(1);
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reader.close();
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assertThrows(IOException.class, () -> reader.read(charBuffer));
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadCharBufferZeroRemainingClosed(Reader reader) throws IOException {
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CharBuffer charBuffer = CharBuffer.allocate(0);
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reader.close();
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assertThrows(IOException.class, () -> reader.read(charBuffer));
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testReadyClosed(Reader reader) throws IOException {
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reader.close();
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assertThrows(IOException.class, () -> reader.ready());
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testSkipClosed(Reader reader) throws IOException {
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reader.close();
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assertThrows(IOException.class, () -> reader.skip(1));
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testTransferToClosed(Reader reader) throws IOException {
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reader.close();
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assertThrows(IOException.class, () -> reader.transferTo(new StringWriter(1)));
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}
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@ParameterizedTest
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@MethodSource("readers")
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public void testCloseClosed(Reader reader) throws IOException {
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reader.close();
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reader.close();
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}
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}
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