| /* |
| * Copyright (c) 2016, 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 8155808 |
| * @run main SkipTest |
| * @summary verify skip method of Process Input Stream |
| */ |
| |
| import java.io.BufferedOutputStream; |
| import java.io.File; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| public class SkipTest { |
| private static final String javaExe = |
| System.getProperty("java.home") + |
| File.separator + "bin" + File.separator + "java"; |
| |
| private static final String classpath = |
| System.getProperty("java.class.path"); |
| |
| static final int BLOCK_SIZE = 10000; |
| |
| |
| public static void main(String[] args) throws Throwable { |
| |
| // Start a Process to generate the test data to stdout and stderr |
| ProcessBuilder pb = new ProcessBuilder(javaExe, "-classpath", classpath, "SkipTest$GenerateData"); |
| System.out.printf("cmd: %s%n", pb.command()); |
| Process process = pb.start(); |
| |
| /* |
| * Verify the data expected is received mixing reads and skip. |
| */ |
| try (InputStream in = process.getInputStream()) { |
| |
| // Note: Process.getInputStream() actually returns a BufferedInputStream whose |
| // skip() method works perfectly, partially obscuring the bug. Only when the |
| // BufferedInputStream's buffer is drained, and it passes the skip() call to |
| // the underlying native stream, does the problem occur. |
| |
| long n = in.skip(-1); |
| if (n != 0) { |
| throw new AssertionError("skip(-1) should return 0"); |
| } |
| n = in.skip(0); |
| if (n != 0) { |
| throw new AssertionError("skip(0) should return 0"); |
| } |
| |
| // Now iterate all the data blocks |
| int header; |
| for (int expectedHeader = 'A'; (header = in.read()) != -1; expectedHeader++) { |
| // The header byte should be simple 'A' to 'Z'. |
| // When the bug hits, we will get lowercase letters instead. |
| if (header != expectedHeader) { |
| throw new AssertionError("header char wrong, expected: " + |
| expectedHeader + ", actual: " + header); |
| } |
| |
| // Handle the data bytes. |
| // If the correct number of bytes are not skipped, |
| // then subsequent reads become out-of-sync; |
| int remaining = BLOCK_SIZE; |
| do { |
| remaining -= in.skip(remaining); |
| } while (remaining != 0); |
| } |
| n = in.skip(1); |
| if (n != 0) { |
| throw new AssertionError("skip(1) at eof should return 0"); |
| } |
| } |
| |
| /** |
| * Do the same for the standard error stream. |
| */ |
| try (InputStream in = process.getErrorStream()) { |
| long n = in.skip(-1); |
| if (n != 0) { |
| throw new AssertionError("skip(-1) should return 0"); |
| } |
| n = in.skip(0); |
| if (n != 0) { |
| throw new AssertionError("skip(0) should return 0"); |
| } |
| |
| // Now iterate all the data blocks |
| int header; |
| for (int expectedHeader = 'A'; (header = in.read()) != -1; expectedHeader++) { |
| // The header byte should be simple 'A' to 'Z'. |
| // When the bug hits, we will get lowercase letters instead. |
| if (header != expectedHeader) { |
| throw new AssertionError("header char wrong, expected: " + |
| expectedHeader + ", actual: " + header); |
| } |
| |
| // Handle the data bytes. |
| // If the correct number of bytes are not skipped, |
| // then subsequent reads become out-of-sync; |
| int remaining = BLOCK_SIZE; |
| do { |
| remaining -= in.skip(remaining); |
| } while (remaining != 0); |
| } |
| n = in.skip(1); |
| if (n != 0) { |
| throw new AssertionError("skip(1) at eof should return 0"); |
| } |
| } |
| } |
| |
| /** |
| * Alternate main to generate the test data to standard output |
| * and standard error. |
| */ |
| static class GenerateData { |
| |
| public static void main(String[] args) { |
| // Generate test data containing a series of data blocks of length BLOCK_SIZE, |
| // each with a one-byte header. For example's sake, the "header" is a capital letter, |
| // and the "data" is the lowercase version of that letter repeated BLOCK_SIZE times: |
| try (OutputStream out = new BufferedOutputStream(System.out)) { |
| for (int header = 'A'; header <= 'Z'; header++) { |
| out.write(header); |
| |
| int data = Character.toLowerCase(header); |
| for (int i = 0; i < BLOCK_SIZE; i++) { |
| out.write(data); |
| } |
| } |
| } catch (IOException ioe) { |
| ioe.printStackTrace(); |
| System.exit(1); |
| } |
| // Generate the same data to the error output |
| try (OutputStream err = new BufferedOutputStream(System.err)) { |
| for (int header = 'A'; header <= 'Z'; header++) { |
| err.write(header); |
| |
| int data = Character.toLowerCase(header); |
| for (int i = 0; i < BLOCK_SIZE; i++) { |
| err.write(data); |
| } |
| } |
| } catch (IOException ioe) { |
| ioe.printStackTrace(); |
| System.exit(1); |
| } |
| } |
| } |
| } |