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Annotation of multiplexer/crc32.h, revision 1.2

1.1       oskar       1: /*
                      2:  * cyclic redundancy check 32 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_32_MSBF 0 \
                     24:     MSBFCOEFF(0)  \
                     25:     MSBFCOEFF(1)  \
                     26:     MSBFCOEFF(2)  \
                     27:     MSBFCOEFF(4)  \
                     28:     MSBFCOEFF(5)  \
                     29:     MSBFCOEFF(7)  \
                     30:     MSBFCOEFF(8)  \
                     31:     MSBFCOEFF(10) \
                     32:     MSBFCOEFF(11) \
                     33:     MSBFCOEFF(12) \
                     34:     MSBFCOEFF(16) \
                     35:     MSBFCOEFF(22) \
                     36:     MSBFCOEFF(23) \
                     37:     MSBFCOEFF(26)
                     38: 
1.2     ! oskar      39: #define CRC_INIT_32   ((uint32_t)(-1))
1.1       oskar      40: 
                     41: #define update_crc_32(crc, data) \
                     42:     ((crc << 8) ^ crc_32_table[((int)(crc >> 24) ^ (data)) & 0xFF])
                     43: 
1.2     ! oskar      44: extern uint32_t crc_32_table[256];
1.1       oskar      45: 
                     46: extern void gen_crc32_table();
                     47: 
1.2     ! oskar      48: extern uint32_t update_crc_32_block(uint32_t crc, char *data_block_ptr, int data_block_size);
1.1       oskar      49: 
                     50: extern void crc32_calc (char *data,
                     51:     int size,
                     52:     char *crc);
                     53: