1 /* 2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* @test 25 * @library /test/lib 26 * @build jdk.test.lib.RandomFactory 27 * @run main TestAvailable 28 * @bug 7031075 8161426 29 * @summary Make sure that available() method behaves as expected. 30 * @key randomness 31 */ 32 33 import java.io.*; 34 import java.util.Random; 35 import java.util.zip.*; 36 import jdk.test.lib.RandomFactory; 37 38 public class TestAvailable { 39 40 public static void main(String args[]) throws Throwable { 41 Random r = RandomFactory.getRandom(); 42 for (int n = 0; n < 10; n++) { 43 byte[] src = new byte[r.nextInt(100) + 1]; 44 r.nextBytes(src); 45 // test InflaterInputStream 46 ByteArrayOutputStream baos = new ByteArrayOutputStream(); 47 try (DeflaterOutputStream dos = new DeflaterOutputStream(baos)) { 48 dos.write(src); 49 } 50 try (InflaterInputStream iis = new InflaterInputStream( 51 new ByteArrayInputStream(baos.toByteArray()))) { 52 test(iis, src); 53 } 54 55 // test GZIPInputStream 56 baos = new ByteArrayOutputStream(); 57 try (GZIPOutputStream dos = new GZIPOutputStream(baos)) { 58 dos.write(src); 59 } 60 try (GZIPInputStream gis = new GZIPInputStream( 61 new ByteArrayInputStream(baos.toByteArray()))) { 62 test(gis, src); 63 } 64 } 65 } 66 67 private static void test(InputStream is, byte[] expected) throws IOException { 68 int cnt = 0; 69 do { 70 int available = is.available(); 71 if (available > 0) { 72 int b = is.read(); 73 if (b == -1) { 74 throw new RuntimeException("available() > 0, read() == -1 : failed!"); 75 } 76 if (expected[cnt++] != (byte)b) { 77 throw new RuntimeException("read() : failed!"); 78 } 79 } else if (available == 0) { 80 if (is.read() != -1) { 81 throw new RuntimeException("available() == 0, read() != -1 : failed!"); 82 } 83 break; 84 } else { 85 throw new RuntimeException("available() < 0 : failed!"); 86 } 87 } while (true); 88 if (cnt != expected.length) { 89 throw new RuntimeException("read : failed!"); 90 } 91 } 92 93 }