99 lines
3.6 KiB
Java
99 lines
3.6 KiB
Java
/*
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* Copyright (c) 2013, 2024, 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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/*
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* @test
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* @bug 8010837 8011136
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* @summary Test if available returns correct value when skipping beyond
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* the end of a file.
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* @author Dan Xu
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*/
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.nio.charset.Charset;
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import java.nio.file.Files;
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import java.nio.file.Path;
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public class NegativeAvailable {
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public static void main(String[] args) throws IOException {
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final int SIZE = 10;
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final int SKIP = 5;
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final int NEGATIVE_SKIP = -5;
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// Create a temporary file with size of 10 bytes.
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Path tmp = Files.createTempFile(null, null);
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try {
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try (BufferedWriter writer =
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Files.newBufferedWriter(tmp, Charset.defaultCharset())) {
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for (int i = 0; i < SIZE; i++) {
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writer.write('1');
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}
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}
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File tempFile = tmp.toFile();
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try (FileInputStream fis = new FileInputStream(tempFile)) {
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if (tempFile.length() != SIZE) {
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throw new RuntimeException("unexpected file size = "
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+ tempFile.length());
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}
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long space = skipBytes(fis, SKIP, SIZE);
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space = skipBytes(fis, NEGATIVE_SKIP, space);
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space = skipBytes(fis, SKIP, space);
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space = skipBytes(fis, SKIP, space);
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space = skipBytes(fis, SKIP, space);
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space = skipBytes(fis, NEGATIVE_SKIP, space);
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space = skipBytes(fis, NEGATIVE_SKIP, space);
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}
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} finally {
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Files.deleteIfExists(tmp);
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}
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}
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/**
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* Skip toSkip number of bytes and return the remaining bytes of the file.
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*/
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private static long skipBytes(FileInputStream fis, int toSkip, long space)
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throws IOException {
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long skip = fis.skip(toSkip);
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if (skip != toSkip) {
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throw new RuntimeException("skip() returns " + skip
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+ " but expected " + toSkip);
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}
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long newSpace = space - toSkip;
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long remaining = newSpace > 0 ? newSpace : 0;
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int avail = fis.available();
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if (avail != remaining) {
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throw new RuntimeException("available() returns " + avail
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+ " but expected " + remaining);
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}
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System.out.println("Skipped " + skip + " bytes "
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+ " available() returns " + avail);
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return newSpace;
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}
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}
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