--- /dev/null 2013-03-26 09:42:25.850082282 -0700 +++ new/test/java/io/FileInputStream/NegativeAvailable.java 2013-03-26 12:11:44.833817574 -0700 @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2013, 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 8010837 + * @summary Test if available returns correct value when skipping beyong + * the end of a file. + * @author Dan Xu + */ + +import java.io.BufferedWriter; +import java.io.File; +import java.io.FileInputStream; +import java.io.IOException; +import java.nio.charset.Charset; +import java.nio.file.Files; +import java.nio.file.Path; + +public class NegativeAvailable { + + public static void main(String[] args) throws IOException { + final int SIZE = 10; + final int SKIP = 5; + + // Create a temporary file with size of 10 bytes. + Path tmp = Files.createTempFile(null, null); + try (BufferedWriter writer = + Files.newBufferedWriter(tmp, Charset.defaultCharset())) { + for (int i = 0; i < SIZE; i++) { + writer.write('1'); + } + } + + File tempFile = tmp.toFile(); + try (FileInputStream fis = new FileInputStream(tempFile)) { + if (tempFile.length() != SIZE) { + throw new RuntimeException("unexpected file size = " + + tempFile.length()); + } + long space = skipBytes(fis, SKIP, SIZE); + space = skipBytes(fis, SKIP, space); + space = skipBytes(fis, SKIP, space); + space = skipBytes(fis, SKIP, space); + } + Files.deleteIfExists(tmp); + } + + /** + * Skip toSkip number of bytes and return the remaining bytes of the file. + */ + private static long skipBytes(FileInputStream fis, int toSkip, long space) + throws IOException { + long skip = fis.skip(toSkip); + if (skip != toSkip) { + throw new RuntimeException("skip() returns " + skip + + " but expected " + toSkip); + } + long remaining = space - toSkip; + int avail = fis.available(); + if (avail != remaining) { + throw new RuntimeException("available() returns " + avail + + " but expected " + remaining); + } + + System.out.println("Skipped " + skip + " bytes " + + " available() returns " + avail); + return remaining; + } +}