131 lines
4.6 KiB
Java
131 lines
4.6 KiB
Java
/*
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* Copyright (c) 2019, 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 8227609
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* @summary Test of InputStream and OutputStream created by java.nio.file.Files
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* @library ..
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*/
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.nio.channels.ClosedChannelException;
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import java.nio.file.*;
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import static java.nio.file.Files.*;
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import static java.nio.file.LinkOption.*;
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import java.nio.file.attribute.*;
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import java.io.IOException;
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import java.util.*;
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public class InputStreamTest {
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public static void main(String[] args) throws IOException {
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Path dir = TestUtil.createTemporaryDirectory();
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try {
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testSkip(dir);
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} finally {
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TestUtil.removeAll(dir);
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}
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}
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/**
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* Tests Files.newInputStream(Path).skip().
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*/
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static void testSkip(Path tmpdir) throws IOException {
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Path file = createFile(tmpdir.resolve("foo"));
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try (OutputStream out = Files.newOutputStream(file)) {
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final int size = 512;
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byte[] blah = new byte[size];
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for (int i = 0; i < size; i++) {
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blah[i] = (byte)(i % 128);
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}
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out.write(blah);
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out.close();
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try (InputStream in = Files.newInputStream(file)) {
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assertTrue(in.available() == size);
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assertTrue(in.skip(size/4) == size/4); // 0.25
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assertTrue(in.available() == 3*size/4);
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int b = in.read();
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assertTrue(b == blah[size/4]);
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assertTrue(in.available() == 3*size/4 - 1);
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assertTrue(in.skip(-1) == -1); // 0.25
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assertTrue(in.available() == 3*size/4);
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assertTrue(in.skip(-size/2) == -size/4); // 0
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assertTrue(in.available() == size);
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assertTrue(in.skip(5*size/4) == size); // 1.0
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assertTrue(in.available() == 0);
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assertTrue(in.skip(-3*size/4) == -3*size/4); // 0.25
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assertTrue(in.available() == 3*size/4);
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byte[] buf = new byte[16];
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in.read(buf, 2, 12);
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assertTrue(Arrays.equals(buf, 2, 14,
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blah, size/4, size/4 + 12));
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assertTrue(in.skip(-12) == -12); // 0.25
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assertTrue(in.skip(3*size/4) == 3*size/4); // 1.0
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assertTrue(in.available() == 0);
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assertTrue(in.skip(-size/2) == -size/2); // 0.5
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assertTrue(in.available() == size/2);
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assertTrue(in.skip(-size) == -size/2); // 0
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assertTrue(in.available() == size);
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assertTrue(in.skip(size/2) == size/2); // 0.5
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assertTrue(in.available() == size/2);
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assertTrue(in.skip(Long.MIN_VALUE) == -size/2); // 0
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assertTrue(in.available() == size);
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assertTrue(in.skip(size/2) == size/2); // 0.5
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assertTrue(in.available() == size/2);
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assertTrue(in.skip(Long.MAX_VALUE - size/4) == size/2);
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assertTrue(in.available() == 0);
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in.close();
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try {
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in.skip(1);
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throw new RuntimeException("skip() did not fail");
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} catch (IOException ioe) {
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if (!(ioe instanceof ClosedChannelException)) {
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throw new RuntimeException
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("IOException is not a ClosedChannelException");
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}
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}
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}
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}
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}
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static void assertTrue(boolean okay) {
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if (!okay)
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throw new RuntimeException("Assertion Failed");
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}
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}
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