1 /*
2 * Copyright (c) 2015, 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 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
35 * @library /test/lib
36 * @run main ReadNBytes
37 * @summary Basic test for InputStream.readNBytes
38 * @key randomness
39 */
40
41 public class ReadNBytes {
42
43 private static Random generator = RandomFactory.getRandom();
44
45 public static void main(String[] args) throws IOException {
46 test(new byte[]{1, 2, 3});
47 test(createRandomBytes(1024));
48 test(createRandomBytes((1 << 13) - 1));
49 test(createRandomBytes((1 << 13)));
50 test(createRandomBytes((1 << 13) + 1));
51 test(createRandomBytes((1 << 15) - 1));
52 test(createRandomBytes((1 << 15)));
53 test(createRandomBytes((1 << 15) + 1));
54 test(createRandomBytes((1 << 17) - 1));
55 test(createRandomBytes((1 << 17)));
56 test(createRandomBytes((1 << 17) + 1));
57 }
58
59 static void test(byte[] inputBytes) throws IOException {
60 int length = inputBytes.length;
61 WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes));
62 byte[] readBytes = new byte[(length / 2) + 1];
63 int nread = in.readNBytes(readBytes, 0, readBytes.length);
64
65 int x;
66 byte[] tmp;
67 check(nread == readBytes.length,
68 "Expected number of bytes read: " + readBytes.length + ", got: " + nread);
69 check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes),
70 "Expected[" + tmp + "], got:[" + readBytes + "]");
71 check(!in.isClosed(), "Stream unexpectedly closed");
72
73 // Read again
74 nread = in.readNBytes(readBytes, 0, readBytes.length);
75
76 check(nread == length - readBytes.length,
77 "Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread);
78 check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)),
79 Arrays.copyOf(readBytes, nread)),
80 "Expected[" + tmp + "], got:[" + readBytes + "]");
81 // Expect end of stream
82 check((x = in.read()) == -1,
83 "Expected end of stream from read(), got " + x);
84 check((x = in.read(tmp)) == -1,
85 "Expected end of stream from read(byte[]), got " + x);
86 check((x = in.read(tmp, 0, tmp.length)) == -1,
87 "Expected end of stream from read(byte[], int, int), got " + x);
88 check((x = in.readNBytes(tmp, 0, tmp.length)) == 0,
89 "Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x);
90 check(!in.isClosed(), "Stream unexpectedly closed");
91 }
92
93 static byte[] createRandomBytes(int size) {
94 byte[] bytes = new byte[size];
95 generator.nextBytes(bytes);
96 return bytes;
97 }
98
99 static void check(boolean cond, Object ... failedArgs) {
100 if (cond)
101 return;
102 StringBuilder sb = new StringBuilder();
103 for (Object o : failedArgs)
104 sb.append(o);
105 throw new RuntimeException(sb.toString());
106 }
107
108
109 static class WrapperInputStream extends FilterInputStream {
110 private boolean closed;
111 WrapperInputStream(InputStream in) { super(in); }
112 @Override public void close() throws IOException { closed = true; in.close(); }
113 boolean isClosed() { return closed; }
114 }
115 }