HCoop / hcoop / debian / openafs.git / blame
| Commit | Line | Data |
|---|---|---|
| 805e021f CE |
1 | /* |
| 2 | * Copyright (c) 1997 - 2000 Kungliga Tekniska Högskolan | |
| 3 | * (Royal Institute of Technology, Stockholm, Sweden). | |
| 4 | * All rights reserved. | |
| 5 | * | |
| 6 | * Redistribution and use in source and binary forms, with or without | |
| 7 | * modification, are permitted provided that the following conditions | |
| 8 | * are met: | |
| 9 | * | |
| 10 | * 1. Redistributions of source code must retain the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer. | |
| 12 | * | |
| 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 | * | |
| 17 | * 3. Neither the name of the Institute nor the names of its contributors | |
| 18 | * may be used to endorse or promote products derived from this software | |
| 19 | * without specific prior written permission. | |
| 20 | * | |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND | |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE | |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 31 | * SUCH DAMAGE. | |
| 32 | */ | |
| 33 | ||
| 34 | /* RCSID("$Heimdal: crc.c,v 1.9 2000/08/03 01:45:14 assar Exp $"); */ | |
| 35 | ||
| 36 | #include <afsconfig.h> | |
| 37 | #include <afs/param.h> | |
| 38 | #include <afs/stds.h> | |
| 39 | ||
| 40 | #include <roken.h> | |
| 41 | ||
| 42 | #include <rx/xdr.h> | |
| 43 | #include <rx/rx.h> | |
| 44 | #include "rxkad.h" | |
| 45 | #include "lifetimes.h" | |
| 46 | ||
| 47 | static u_long table[256]; | |
| 48 | ||
| 49 | #define CRC_GEN 0xEDB88320L | |
| 50 | ||
| 51 | void | |
| 52 | _rxkad_crc_init_table(void) | |
| 53 | { | |
| 54 | static int flag = 0; | |
| 55 | unsigned long crc, poly; | |
| 56 | int i, j; | |
| 57 | ||
| 58 | if (flag) | |
| 59 | return; | |
| 60 | poly = CRC_GEN; | |
| 61 | for (i = 0; i < 256; i++) { | |
| 62 | crc = i; | |
| 63 | for (j = 8; j > 0; j--) { | |
| 64 | if (crc & 1) { | |
| 65 | crc = (crc >> 1) ^ poly; | |
| 66 | } else { | |
| 67 | crc >>= 1; | |
| 68 | } | |
| 69 | } | |
| 70 | table[i] = crc; | |
| 71 | } | |
| 72 | flag = 1; | |
| 73 | } | |
| 74 | ||
| 75 | afs_uint32 | |
| 76 | _rxkad_crc_update(const char *p, size_t len, afs_uint32 res) | |
| 77 | { | |
| 78 | while (len--) | |
| 79 | res = table[(res ^ *p++) & 0xFF] ^ (res >> 8); | |
| 80 | return res & 0xFFFFFFFF; | |
| 81 | } |