1 /*
2 * Copyright (c) 2013, 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 /*
25 @test
26 @bug 7088419
27 @run main CRCTest
28 @summary Use x86 Hardware CRC32 Instruction with java.util.zip.CRC32 and java.util.zip.Adler32
29 */
30
31 import java.nio.ByteBuffer;
32 import java.util.zip.CRC32;
33 import java.util.zip.Checksum;
34
35 public class CRCTest {
36
37 public static void main(String[] args) throws Exception {
38
39 byte[] b = initializedBytes(4096 * 4096);
40
41 {
42 CRC32 crc1 = new CRC32();
43 CRC32 crc2 = new CRC32();
44 CRC32 crc3 = new CRC32();
45 CRC32 crc4 = new CRC32();
46
47 crc1.update(b, 0, b.length);
48 updateSerial(crc2, b, 0, b.length);
49 updateDirect(crc3, b, 0, b.length);
50 updateSerialSlow(crc4, b, 0, b.length);
51
52 check(crc1, crc2);
53 check(crc3, crc4);
54 check(crc1, crc3);
55
56 crc1.update(17);
57 crc2.update(17);
58 crc3.update(17);
59 crc4.update(17);
60
61 crc1.update(b, 1, b.length-2);
62 updateSerial(crc2, b, 1, b.length-2);
63 updateDirect(crc3, b, 1, b.length-2);
64 updateSerialSlow(crc4, b, 1, b.length-2);
65
66 check(crc1, crc2);
67 check(crc3, crc4);
68 check(crc1, crc3);
69
70 report("finished huge crc", crc1, crc2, crc3, crc4);
71
72 for (int i = 0; i < 256; i++) {
73 for (int j = 0; j < 256; j += 1) {
74 crc1.update(b, i, j);
75 updateSerial(crc2, b, i, j);
76 updateDirect(crc3, b, i, j);
77 updateSerialSlow(crc4, b, i, j);
78
79 check(crc1, crc2);
80 check(crc3, crc4);
81 check(crc1, crc3);
82
83 }
84 }
85
86 report("finished small survey crc", crc1, crc2, crc3, crc4);
87 }
88
89 }
90
91 private static void report(String s, Checksum crc1, Checksum crc2,
92 Checksum crc3, Checksum crc4) {
93 System.out.println(s + ", crc1 = " + crc1.getValue() +
94 ", crc2 = " + crc2.getValue()+
95 ", crc3 = " + crc3.getValue()+
96 ", crc4 = " + crc4.getValue());
97 }
98
99 private static void check(Checksum crc1, Checksum crc2) throws Exception {
100 if (crc1.getValue() != crc2.getValue()) {
101 String s = "value 1 = " + crc1.getValue() + ", value 2 = " + crc2.getValue();
102 System.err.println(s);
103 throw new Exception(s);
104 }
105 }
106
107 private static byte[] initializedBytes(int M) {
108 byte[] bytes = new byte[M];
109 for (int i = 0; i < bytes.length; i++) {
110 bytes[i] = (byte) i;
111 }
112 return bytes;
113 }
114
115 private static void updateSerial(Checksum crc, byte[] b, int start, int length) {
116 for (int i = 0; i < length; i++)
117 crc.update(b[i+start]);
118 }
119
120 private static void updateSerialSlow(Checksum crc, byte[] b, int start, int length) {
121 for (int i = 0; i < length; i++)
122 crc.update(b[i+start]);
123 crc.getValue();
124 }
125
126 private static void updateDirect(CRC32 crc3, byte[] b, int start, int length) {
127 ByteBuffer buf = ByteBuffer.allocateDirect(length);
128 buf.put(b, start, length);
129 buf.flip();
130 crc3.update(buf);
131 }
132 }