| /* |
| * Copyright (c) 2015, 2017, 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. |
| */ |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Arrays; |
| import java.util.Random; |
| import jdk.test.lib.RandomFactory; |
| |
| /* |
| * @test |
| * @bug 8080835 |
| * @library /test/lib |
| * @build jdk.test.lib.RandomFactory |
| * @run main ReadNBytes |
| * @summary Basic test for InputStream.readNBytes |
| * @key randomness |
| */ |
| |
| public class ReadNBytes { |
| |
| private static Random generator = RandomFactory.getRandom(); |
| |
| public static void main(String[] args) throws IOException { |
| test(new byte[]{1, 2, 3}); |
| test(createRandomBytes(1024)); |
| test(createRandomBytes((1 << 13) - 1)); |
| test(createRandomBytes((1 << 13))); |
| test(createRandomBytes((1 << 13) + 1)); |
| test(createRandomBytes((1 << 15) - 1)); |
| test(createRandomBytes((1 << 15))); |
| test(createRandomBytes((1 << 15) + 1)); |
| test(createRandomBytes((1 << 17) - 1)); |
| test(createRandomBytes((1 << 17))); |
| test(createRandomBytes((1 << 17) + 1)); |
| } |
| |
| static void test(byte[] inputBytes) throws IOException { |
| int length = inputBytes.length; |
| WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes)); |
| byte[] readBytes = new byte[(length / 2) + 1]; |
| int nread = in.readNBytes(readBytes, 0, readBytes.length); |
| |
| int x; |
| byte[] tmp; |
| check(nread == readBytes.length, |
| "Expected number of bytes read: " + readBytes.length + ", got: " + nread); |
| check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes), |
| "Expected[" + tmp + "], got:[" + readBytes + "]"); |
| check(!in.isClosed(), "Stream unexpectedly closed"); |
| |
| // Read again |
| nread = in.readNBytes(readBytes, 0, readBytes.length); |
| |
| check(nread == length - readBytes.length, |
| "Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread); |
| check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)), |
| Arrays.copyOf(readBytes, nread)), |
| "Expected[" + tmp + "], got:[" + readBytes + "]"); |
| // Expect end of stream |
| check((x = in.read()) == -1, |
| "Expected end of stream from read(), got " + x); |
| check((x = in.read(tmp)) == -1, |
| "Expected end of stream from read(byte[]), got " + x); |
| check((x = in.read(tmp, 0, tmp.length)) == -1, |
| "Expected end of stream from read(byte[], int, int), got " + x); |
| check((x = in.readNBytes(tmp, 0, tmp.length)) == 0, |
| "Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x); |
| check(!in.isClosed(), "Stream unexpectedly closed"); |
| } |
| |
| static byte[] createRandomBytes(int size) { |
| byte[] bytes = new byte[size]; |
| generator.nextBytes(bytes); |
| return bytes; |
| } |
| |
| static void check(boolean cond, Object ... failedArgs) { |
| if (cond) |
| return; |
| StringBuilder sb = new StringBuilder(); |
| for (Object o : failedArgs) |
| sb.append(o); |
| throw new RuntimeException(sb.toString()); |
| } |
| |
| |
| static class WrapperInputStream extends FilterInputStream { |
| private boolean closed; |
| WrapperInputStream(InputStream in) { super(in); } |
| @Override public void close() throws IOException { closed = true; in.close(); } |
| boolean isClosed() { return closed; } |
| } |
| } |