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///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2016 Edouard Griffiths, F4EXB. //
// //
// 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 as version 3 of the License, or //
// //
// 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 V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include "pn.h"
namespace DSDcc
{
PN_9_5::PN_9_5(unsigned int seed) : m_seed(seed)
{
init();
}
PN_9_5::~PN_9_5()
{}
void PN_9_5::init()
{
unsigned char byte;
unsigned int sr = m_seed;
for (int i = 0; i < 512; i++)
{
if (i%8 == 0)
{
byte = 0;
}
unsigned int bit0 = (sr & 1);
unsigned int bit4 = (sr & 0x10) >> 4;
sr >>= 1;
sr |= (bit4 ^ bit0) << 8;
m_bitTable[i] = bit0;
byte += bit0 << (7 - (i%8));
if (i%8 == 7)
{
m_byteTable[i/8] = byte;
}
}
}
} // namespace DSDcc
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