/*
* @(#) crc.h 1.5, last edit: 6/15/94 16:55:32
* @(#) Copyright (C) 1993, 1994 Tobias Bading (bading@cs.tu-berlin.de)
* @(#) Berlin University of Technology
*
* 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.
*/
#ifndef CRC_H
#define CRC_H
#include "all.h"
// 16-Bit CRC checksum class:
class Crc16
{
static const uint16 polynomial;
uint16 crc;
public:
Crc16() { crc = 0xFFFF; }
void add_bits (uint32 bitstring, uint32 length);
// feed a bitstring to the crc calculation (0 < length <= 32)
uint16 checksum()
// return the calculated checksum and erase it for next calls to add_bits()
{
register uint16 sum = crc;
crc = 0xFFFF;
return sum;
}
};
#endif