Commit | Line | Data |
---|---|---|
15637ed4 | 1 | /*- |
78ed81a3 | 2 | * Copyright (c) 1991, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
15637ed4 RG |
4 | * |
5 | * This code is derived from software contributed to Berkeley by | |
78ed81a3 | 6 | * James W. Williams of NASA Goddard Space Flight Center. |
15637ed4 RG |
7 | * |
8 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
78ed81a3 | 38 | static char sccsid[] = "@(#)crc.c 8.1 (Berkeley) 6/17/93"; |
15637ed4 RG |
39 | #endif /* not lint */ |
40 | ||
41 | #include <sys/types.h> | |
42 | #include <unistd.h> | |
43 | ||
78ed81a3 | 44 | static u_long crctab[] = { |
45 | 0x0, | |
46 | 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, | |
47 | 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, | |
48 | 0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd, | |
49 | 0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac, | |
50 | 0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f, | |
51 | 0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a, | |
52 | 0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039, | |
53 | 0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58, | |
54 | 0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033, | |
55 | 0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe, | |
56 | 0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95, | |
57 | 0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4, | |
58 | 0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0, | |
59 | 0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5, | |
60 | 0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16, | |
61 | 0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07, | |
62 | 0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c, | |
63 | 0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1, | |
64 | 0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba, | |
65 | 0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b, | |
66 | 0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698, | |
67 | 0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d, | |
68 | 0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e, | |
69 | 0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f, | |
70 | 0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34, | |
71 | 0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80, | |
72 | 0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb, | |
73 | 0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a, | |
74 | 0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629, | |
75 | 0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c, | |
76 | 0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff, | |
77 | 0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e, | |
78 | 0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65, | |
79 | 0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8, | |
80 | 0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3, | |
81 | 0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2, | |
82 | 0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71, | |
83 | 0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74, | |
84 | 0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640, | |
85 | 0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21, | |
86 | 0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a, | |
87 | 0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087, | |
88 | 0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec, | |
89 | 0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d, | |
90 | 0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce, | |
91 | 0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb, | |
92 | 0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18, | |
93 | 0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09, | |
94 | 0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662, | |
95 | 0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf, | |
96 | 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 | |
15637ed4 RG |
97 | }; |
98 | ||
99 | /* | |
78ed81a3 | 100 | * Compute a POSIX 1003.2 checksum. This routine has been broken out so that |
101 | * other programs can use it. It takes a file descriptor to read from and | |
102 | * locations to store the crc and the number of bytes read. It returns 0 on | |
103 | * success and 1 on failure. Errno is set on failure. | |
15637ed4 | 104 | */ |
78ed81a3 | 105 | u_long crc_total = ~0; /* The crc over a number of files. */ |
106 | ||
107 | int | |
15637ed4 RG |
108 | crc(fd, cval, clen) |
109 | register int fd; | |
110 | u_long *cval, *clen; | |
111 | { | |
15637ed4 | 112 | register u_char *p; |
78ed81a3 | 113 | register int nr; |
114 | register u_long crc, len; | |
115 | u_char buf[16 * 1024]; | |
116 | ||
117 | #define COMPUTE(var, ch) (var) = (var) << 8 ^ crctab[(var) >> 24 ^ (ch)] | |
15637ed4 | 118 | |
78ed81a3 | 119 | crc = len = 0; |
120 | crc_total = ~crc_total; | |
15637ed4 | 121 | while ((nr = read(fd, buf, sizeof(buf))) > 0) |
78ed81a3 | 122 | for (len += nr, p = buf; nr--; ++p) { |
123 | COMPUTE(crc, *p); | |
124 | COMPUTE(crc_total, *p); | |
15637ed4 RG |
125 | } |
126 | if (nr < 0) | |
78ed81a3 | 127 | return (1); |
128 | ||
129 | *clen = len; | |
130 | ||
131 | /* Include the length of the file. */ | |
132 | for (; len != 0; len >>= 8) { | |
133 | COMPUTE(crc, len & 0xff); | |
134 | COMPUTE(crc_total, len & 0xff); | |
135 | } | |
15637ed4 | 136 | |
78ed81a3 | 137 | *cval = ~crc; |
138 | crc_total = ~crc_total; | |
139 | return (0); | |
15637ed4 | 140 | } |