1 /* 2 * Copyright (c) 2015, 2018, 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 import java.io.ByteArrayInputStream; 25 import java.io.FilterInputStream; 26 import java.io.IOException; 27 import java.io.InputStream; 28 import java.util.Arrays; 29 import java.util.Random; 30 import jdk.test.lib.RandomFactory; 31 32 /* 33 * @test 34 * @bug 8080835 8139206 35 * @library /test/lib 36 * @build jdk.test.lib.RandomFactory 37 * @run main ReadNBytes 38 * @summary Basic test for InputStream.readNBytes 39 * @key randomness 40 */ 41 42 public class ReadNBytes { 43 44 private static Random generator = RandomFactory.getRandom(); 45 46 public static void main(String[] args) throws IOException { 47 test(new byte[]{1, 2, 3}); 48 test(createRandomBytes(1024)); 49 for (int shift : new int[] {13, 15, 17}) { 50 for (int offset : new int[] {-1, 0, 1}) { 51 test(createRandomBytes((1 << shift) + offset)); 52 } 53 } 54 55 test(-1); 56 test(0); 57 for (int shift : new int[] {13, 15, 17}) { 58 for (int offset : new int[] {-1, 0, 1}) { 59 test((1 << shift) + offset); 60 } 61 } 62 } 63 64 static void test(byte[] inputBytes) throws IOException { 65 int length = inputBytes.length; 66 WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes)); 67 byte[] readBytes = new byte[(length / 2) + 1]; 68 int nread = in.readNBytes(readBytes, 0, readBytes.length); 69 70 int x; 71 byte[] tmp; 72 check(nread == readBytes.length, 73 "Expected number of bytes read: " + readBytes.length + ", got: " + nread); 74 check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes), 75 "Expected[" + tmp + "], got:[" + readBytes + "]"); 76 check(!in.isClosed(), "Stream unexpectedly closed"); 77 78 // Read again 79 nread = in.readNBytes(readBytes, 0, readBytes.length); 80 81 check(nread == length - readBytes.length, 82 "Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread); 83 check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)), 84 Arrays.copyOf(readBytes, nread)), 85 "Expected[" + tmp + "], got:[" + readBytes + "]"); 86 // Expect end of stream 87 check((x = in.read()) == -1, 88 "Expected end of stream from read(), got " + x); 89 check((x = in.read(tmp)) == -1, 90 "Expected end of stream from read(byte[]), got " + x); 91 check((x = in.read(tmp, 0, tmp.length)) == -1, 92 "Expected end of stream from read(byte[], int, int), got " + x); 93 check((x = in.readNBytes(tmp, 0, tmp.length)) == 0, 94 "Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x); 95 check(!in.isClosed(), "Stream unexpectedly closed"); 96 } 97 98 static void test(int max) throws IOException { 99 byte[] inputBytes = max <= 0 ? new byte[0] : createRandomBytes(max); 100 WrapperInputStream in = 101 new WrapperInputStream(new ByteArrayInputStream(inputBytes)); 102 103 if (max < 0) { 104 try { 105 in.readNBytes(max); 106 check(false, "Expected IndexOutOfBoundsException not thrown"); 107 } catch (IndexOutOfBoundsException ioobe) { 108 return; 109 } 110 } else if (max == 0) { 111 int x; 112 check((x = in.readNBytes(max).length) == 0, 113 "Expected zero bytes, got " + x); 114 return; 115 } 116 117 int off = Math.toIntExact(in.skip(generator.nextInt(max/2))); 118 int len = generator.nextInt(max - 1 - off); 119 byte[] readBytes = in.readNBytes(len); 120 check(readBytes.length == len, 121 "Expected " + len + " bytes, got " + readBytes.length); 122 check(Arrays.equals(inputBytes, off, off + len, readBytes, 0, len), 123 "Expected[" + Arrays.copyOfRange(inputBytes, off, off + len) + 124 "], got:[" + readBytes + "]"); 125 126 int remaining = max - (off + len); 127 readBytes = in.readNBytes(remaining); 128 check(readBytes.length == remaining, 129 "Expected " + remaining + "bytes, got " + readBytes.length); 130 check(Arrays.equals(inputBytes, off + len, max, 131 readBytes, 0, remaining), 132 "Expected[" + Arrays.copyOfRange(inputBytes, off + len, max) + 133 "], got:[" + readBytes + "]"); 134 135 check(!in.isClosed(), "Stream unexpectedly closed"); 136 } 137 138 static byte[] createRandomBytes(int size) { 139 byte[] bytes = new byte[size]; 140 generator.nextBytes(bytes); 141 return bytes; 142 } 143 144 static void check(boolean cond, Object ... failedArgs) { 145 if (cond) 146 return; 147 StringBuilder sb = new StringBuilder(); 148 for (Object o : failedArgs) 149 sb.append(o); 150 throw new RuntimeException(sb.toString()); 151 } 152 153 154 static class WrapperInputStream extends FilterInputStream { 155 private boolean closed; 156 WrapperInputStream(InputStream in) { super(in); } 157 @Override public void close() throws IOException { closed = true; in.close(); } 158 boolean isClosed() { return closed; } 159 } 160 }