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Annotation of multiplexer/crc16.h, revision 1.2

1.1       oskar       1: /*
                      2:  * cyclic redundancy check 16 bit
                      3:  * Copyright (C) 1999 Christian Wolff, 2004 Oskar Schirmer
                      4:  * for Convergence Integrated Media GmbH (http://www.convergence.de)
                      5:  *
                      6:  * This program is free software; you can redistribute it and/or modify
                      7:  * it under the terms of the GNU General Public License as published by
                      8:  * the Free Software Foundation; either version 2 of the License, or
                      9:  * (at your option) any later version.
                     10:  *
                     11:  * This program is distributed in the hope that it will be useful,
                     12:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
                     13:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     14:  * GNU General Public License for more details.
                     15:  *
                     16:  * You should have received a copy of the GNU General Public License
                     17:  * along with this program; if not, write to the Free Software
                     18:  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
                     19:  */
                     20: 
                     21: #define MSBFCOEFF(x) | (1UL << x)
                     22: 
                     23: #define POLYNOMIAL_16_MSBF 0 \
                     24:     MSBFCOEFF(0)  \
                     25:     MSBFCOEFF(1)  \
                     26:     MSBFCOEFF(5)  \
                     27:     MSBFCOEFF(12)
                     28: 
1.2     ! oskar      29: #define CRC_INIT_16   ((uint16_t)(-1))
1.1       oskar      30: 
                     31: #define update_crc_16(crc, data) \
                     32:     ((crc << 8) ^ crc_16_table[((int)(crc >> 8 ) ^ (data)) & 0xFF])
                     33: 
1.2     ! oskar      34: extern uint16_t crc_16_table[256];
1.1       oskar      35: 
                     36: extern void gen_crc16_table();
                     37: 
1.2     ! oskar      38: extern uint16_t update_crc_16_block(uint16_t crc, char *data_block_ptr, int data_block_size);
1.1       oskar      39: 
                     40: extern void crc16_calc (char *data,
                     41:     int size,
                     42:     char *crc);
                     43: