/*
crc.h
Copyright (C) Christian Wolff for convergence integrated media.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*---------------------------------------------------------
Cyclic Redundancy Check 16 and 32 Bit - Header File
Christian Wolff, 19990122
---------------------------------------------------------*/
#ifndef _CRC_H_
#define _CRC_H_
// 16 Bit CCITT standard polynomial x^16 + x^12 + x^5 + x^1 + x^0
#define POLYNOMIAL_16 0x1021
// 32 Bit standard polynomial x^32 + x^26 + x^23 + x^22 + x^16 +
// x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + x^0
#define POLYNOMIAL_32 0x04C11DB7L
#define CRC_INIT_16 0xFFFF
#define CRC_INIT_32 0xFFFFFFFFL
#define update_crc_16(crc, data) ((crc << 8) ^ crc_16_table[((int)(crc >> 8 ) ^ (data)) & 0xFF])
#define update_crc_32(crc, data) ((crc << 8) ^ crc_32_table[((int)(crc >> 24) ^ (data)) & 0xFF])
extern unsigned short crc_16_table[256];
extern unsigned long crc_32_table[256];
extern void gen_crc_table(void);
extern unsigned short update_crc_16_block(unsigned short crc,
char *data_block_ptr,
int data_block_size);
extern unsigned long update_crc_32_block(unsigned long crc,
char *data_block_ptr,
int data_block_size);
#endif
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