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Java > Open Source Codes > com > sun > jdo > api > persistence > enhancer > util > CRC32


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23
24
25 package com.sun.jdo.api.persistence.enhancer.util;
26
27 /**
28  * CRC32 provides CRC computation for the zip file code
29  */
30
31 class CRC32 {
32
33   /**
34    * Compute the CRC for "len" bytes in "buf"
35    */
36
37   static int computeCRC(int crc, byte buf[], int len) {
38     if (buf == null) return 0;
39
40     int bufIndex = 0;
41     crc = crc ^ 0xffffffff;
42     while (len >= 8) {
43     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
44     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
45     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
46     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
47     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
48     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
49     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
50     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
51       len -= 8;
52     }
53
54     if (len != 0)
55       do {
56     crc = CRCTable[(crc ^ ((int) buf[bufIndex++])) & 0xff] ^ (crc >>> 8);
57       } while ((--len) > 0);
58     return crc ^ 0xffffffff;
59   }
60
61   static int CRCTable[] = {
62     0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419,
63     0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4,
64     0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07,
65     0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
66     0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856,
67     0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
68     0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4,
69     0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
70     0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3,
71     0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a,
72     0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599,
73     0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
74     0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190,
75     0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f,
76     0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e,
77     0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
78     0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed,
79     0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
80     0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3,
81     0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
82     0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a,
83     0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5,
84     0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010,
85     0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
86     0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17,
87     0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6,
88     0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615,
89     0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
90     0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344,
91     0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
92     0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a,
93     0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
94     0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1,
95     0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c,
96     0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef,
97     0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
98     0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe,
99     0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31,
100     0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c,
101     0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
102     0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b,
103     0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
104     0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1,
105     0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
106     0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278,
107     0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7,
108     0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66,
109     0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
110     0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605,
111     0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8,
112     0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b,
113     0x2d02ef8d
114   };
115
116 }
117
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