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/*GPL*START*
*
* crc engine for use with audio mpeg streams
*
* Copyright (C) 1998-2001 by Johannes Overmann <Johannes.Overmann@gmx.de>
*
* 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.
*
* *GPL*END*/
#include "crc16.h"
// create crc engine and reset to 0 (build shift table)
CRC16::CRC16(unsigned int polynom): c(0)
{
for(unsigned int i = 0; i < 256; ++i)
{
unsigned int x = i << 9;
for(int j=0; j < 8; ++j, x <<= 1)
if(x & 0x10000)
x ^= polynom;
tab[i] = x>>1;
}
}
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