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Annotation of margi2/crc.h, revision 1.1.1.1

1.1       cvs         1: /* 
                      2:     crc.h
                      3: 
                      4:     Copyright (C) Christian Wolff for convergence integrated media.
                      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., 675 Mass Ave, Cambridge, MA 02139, USA.
                     19: */
                     20: 
                     21: /*---------------------------------------------------------
                     22: 
                     23: Cyclic Redundancy Check 16 and 32 Bit - Header File
                     24: 
                     25: Christian Wolff, 19990122
                     26: 
                     27: ---------------------------------------------------------*/
                     28: 
                     29: #ifndef _CRC_H_
                     30: #define _CRC_H_
                     31: 
                     32: // 16 Bit CCITT standard polynomial x^16 + x^12 + x^5 + x^1 + x^0
                     33: #define POLYNOMIAL_16 0x1021
                     34: // 32 Bit standard polynomial x^32 + x^26 + x^23 + x^22 + x^16 +
                     35: //   x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + x^0
                     36: #define POLYNOMIAL_32 0x04C11DB7L
                     37: 
                     38: #define CRC_INIT_16   0xFFFF
                     39: #define CRC_INIT_32   0xFFFFFFFFL
                     40: 
                     41: #define update_crc_16(crc, data) ((crc << 8) ^ crc_16_table[((int)(crc >> 8 ) ^ (data)) & 0xFF])
                     42: #define update_crc_32(crc, data) ((crc << 8) ^ crc_32_table[((int)(crc >> 24) ^ (data)) & 0xFF])
                     43: 
                     44: extern unsigned short crc_16_table[256];
                     45: extern unsigned long crc_32_table[256];
                     46: 
                     47: extern void gen_crc_table(void);
                     48: 
                     49: extern unsigned short update_crc_16_block(unsigned short crc,
                     50:                                          char *data_block_ptr,
                     51:                                          int data_block_size);
                     52: extern unsigned long update_crc_32_block(unsigned long crc,
                     53:                                         char *data_block_ptr,
                     54:                                         int data_block_size);
                     55: 
                     56: #endif