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1.1 ! root 1: /* crc16.h */ ! 2: ! 3: /* CCITT 16-bit CRC table and calculation macro */ ! 4: ! 5: /* $Id: crc16.h,v 1.2 2003/10/15 02:51:26 rswindell Exp $ */ ! 6: ! 7: /**************************************************************************** ! 8: * @format.tab-size 4 (Plain Text/Source Code File Header) * ! 9: * @format.use-tabs true (see http://www.synchro.net/ptsc_hdr.html) * ! 10: * * ! 11: * Copyright 2003 Rob Swindell - http://www.synchro.net/copyright.html * ! 12: * * ! 13: * This program is free software; you can redistribute it and/or * ! 14: * modify it under the terms of the GNU General Public License * ! 15: * as published by the Free Software Foundation; either version 2 * ! 16: * of the License, or (at your option) any later version. * ! 17: * See the GNU General Public License for more details: gpl.txt or * ! 18: * http://www.fsf.org/copyleft/gpl.html * ! 19: * * ! 20: * Anonymous FTP access to the most recent released source is available at * ! 21: * ftp://vert.synchro.net, ftp://cvs.synchro.net and ftp://ftp.synchro.net * ! 22: * * ! 23: * Anonymous CVS access to the development source and modification history * ! 24: * is available at cvs.synchro.net:/cvsroot/sbbs, example: * ! 25: * cvs -d :pserver:[email protected]:/cvsroot/sbbs login * ! 26: * (just hit return, no password is necessary) * ! 27: * cvs -d :pserver:[email protected]:/cvsroot/sbbs checkout src * ! 28: * * ! 29: * For Synchronet coding style and modification guidelines, see * ! 30: * http://www.synchro.net/source.html * ! 31: * * ! 32: * You are encouraged to submit any modifications (preferably in Unix diff * ! 33: * format) via e-mail to [email protected] * ! 34: * * ! 35: * Note: If this box doesn't appear square, then you need to fix your tabs. * ! 36: ****************************************************************************/ ! 37: ! 38: #ifndef _CRC16_H_ ! 39: #define _CRC16_H_ ! 40: ! 41: #ifdef __cplusplus ! 42: extern "C" { ! 43: #endif ! 44: ! 45: extern unsigned short crc16tbl[]; ! 46: ! 47: unsigned short crc16(char *data, unsigned long len); ! 48: ! 49: #ifdef __cplusplus ! 50: } ! 51: #endif ! 52: ! 53: #define ucrc16(ch,crc) (crc16tbl[((crc>>8)&0xff)^(unsigned char)ch]^(crc << 8)) ! 54: ! 55: #endif /* Don't add anything after this line */
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