crc.h
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VC书籍
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Visual C++
- /*
- * @(#) 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