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 * @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 test(createRandomBytes((1 << 13) - 1));
50 test(createRandomBytes((1 << 13)));
51 test(createRandomBytes((1 << 13) + 1));
52 test(createRandomBytes((1 << 15) - 1));
53 test(createRandomBytes((1 << 15)));
54 test(createRandomBytes((1 << 15) + 1));
55 test(createRandomBytes((1 << 17) - 1));
56 test(createRandomBytes((1 << 17)));
57 test(createRandomBytes((1 << 17) + 1));
58 }
59
60 static void test(byte[] inputBytes) throws IOException {
61 int length = inputBytes.length;
62 WrapperInputStream in = new WrapperInputStream(new ByteArrayInputStream(inputBytes));
63 byte[] readBytes = new byte[(length / 2) + 1];
64 int nread = in.readNBytes(readBytes, 0, readBytes.length);
65
66 int x;
67 byte[] tmp;
68 check(nread == readBytes.length,
69 "Expected number of bytes read: " + readBytes.length + ", got: " + nread);
70 check(Arrays.equals((tmp = Arrays.copyOf(inputBytes, nread)), readBytes),
71 "Expected[" + tmp + "], got:[" + readBytes + "]");
72 check(!in.isClosed(), "Stream unexpectedly closed");
73
74 // Read again
75 nread = in.readNBytes(readBytes, 0, readBytes.length);
76
77 check(nread == length - readBytes.length,
78 "Expected number of bytes read: " + (length - readBytes.length) + ", got: " + nread);
79 check(Arrays.equals((tmp = Arrays.copyOfRange(inputBytes, readBytes.length, length)),
80 Arrays.copyOf(readBytes, nread)),
81 "Expected[" + tmp + "], got:[" + readBytes + "]");
82 // Expect end of stream
83 check((x = in.read()) == -1,
84 "Expected end of stream from read(), got " + x);
85 check((x = in.read(tmp)) == -1,
86 "Expected end of stream from read(byte[]), got " + x);
87 check((x = in.read(tmp, 0, tmp.length)) == -1,
88 "Expected end of stream from read(byte[], int, int), got " + x);
89 check((x = in.readNBytes(tmp, 0, tmp.length)) == 0,
90 "Expected end of stream, 0, from readNBytes(byte[], int, int), got " + x);
91 check(!in.isClosed(), "Stream unexpectedly closed");
92 }
93
94 static byte[] createRandomBytes(int size) {
95 byte[] bytes = new byte[size];
96 generator.nextBytes(bytes);
97 return bytes;
98 }
99
100 static void check(boolean cond, Object ... failedArgs) {
101 if (cond)
102 return;
103 StringBuilder sb = new StringBuilder();
104 for (Object o : failedArgs)
105 sb.append(o);
106 throw new RuntimeException(sb.toString());
107 }
108
109
110 static class WrapperInputStream extends FilterInputStream {
111 private boolean closed;
112 WrapperInputStream(InputStream in) { super(in); }
113 @Override public void close() throws IOException { closed = true; in.close(); }
114 boolean isClosed() { return closed; }
115 }
116 }