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