209 lines
4.3 KiB
C++
209 lines
4.3 KiB
C++
/*
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* Copyright (C) 2018 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "NXDNDefines.h"
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#include "NXDNLICH.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned char BIT_MASK_TABLE[] = {0x80U, 0x40U, 0x20U, 0x10U, 0x08U, 0x04U, 0x02U, 0x01U};
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#define WRITE_BIT1(p,i,b) p[(i)>>3] = (b) ? (p[(i)>>3] | BIT_MASK_TABLE[(i)&7]) : (p[(i)>>3] & ~BIT_MASK_TABLE[(i)&7])
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#define READ_BIT1(p,i) (p[(i)>>3] & BIT_MASK_TABLE[(i)&7])
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CNXDNLICH::CNXDNLICH(const CNXDNLICH& lich) :
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m_lich(lich.m_lich)
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{
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}
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CNXDNLICH::CNXDNLICH() :
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m_lich(0U)
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{
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}
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CNXDNLICH::~CNXDNLICH()
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{
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}
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bool CNXDNLICH::decode(const unsigned char* bytes)
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{
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assert(bytes != NULL);
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unsigned char lich[1U];
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lich[0U] = 0x00U;
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unsigned int offset = NXDN_FSW_LENGTH_BITS;
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bool b7 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 7U, b7);
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offset++;
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bool b6 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 6U, b6);
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offset++;
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bool b5 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 5U, b5);
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offset++;
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bool b4 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 4U, b4);
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offset++;
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bool b3 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 3U, b3);
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offset++;
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bool b2 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 2U, b2);
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offset++;
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bool b1 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 1U, b1);
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offset++;
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bool b0 = READ_BIT1(bytes, offset);
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WRITE_BIT1(lich, 0U, b0);
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bool parity = b7 ^ b6 ^ b5 ^ b4;
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LogMessage("NXDN, LICH bits: %d%d %d%d %d%d %d - %d, parity: %d", b7 ? 1 : 0, b6 ? 1 : 0, b5 ? 1 : 0, b4 ? 1 : 0, b3 ? 1 : 0, b2 ? 1 : 0, b1 ? 1 : 0, b0 ? 1 : 0, parity ? 1 : 0);
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if (parity != b0)
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return false;
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m_lich = lich[0U] >> 1;
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return true;
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}
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void CNXDNLICH::encode(unsigned char* bytes)
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{
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assert(bytes != NULL);
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unsigned char lich[1U];
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lich[0U] = m_lich << 1;
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bool b7 = READ_BIT1(lich, 7U);
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bool b6 = READ_BIT1(lich, 6U);
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bool b5 = READ_BIT1(lich, 5U);
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bool b4 = READ_BIT1(lich, 4U);
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bool b3 = READ_BIT1(lich, 3U);
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bool b2 = READ_BIT1(lich, 2U);
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bool b1 = READ_BIT1(lich, 1U);
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bool b0 = READ_BIT1(lich, 0U);
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bool parity = b7 ^ b6 ^ b5 ^ b4;
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WRITE_BIT1(lich, 0U, parity);
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unsigned int offset = NXDN_FSW_LENGTH_BITS;
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WRITE_BIT1(bytes, offset, b7);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b6);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b5);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b4);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b3);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b2);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b1);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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WRITE_BIT1(bytes, offset, b0);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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}
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unsigned char CNXDNLICH::getRFCT() const
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{
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return (m_lich >> 5) & 0x03U;
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}
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unsigned char CNXDNLICH::getFCT() const
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{
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return (m_lich >> 3) & 0x03U;
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}
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unsigned char CNXDNLICH::getOption() const
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{
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return (m_lich >> 1) & 0x03U;
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}
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unsigned char CNXDNLICH::getDirection() const
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{
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return m_lich & 0x01U;
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}
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void CNXDNLICH::setRFCT(unsigned char rfct)
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{
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m_lich &= 0x1FU;
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m_lich |= (rfct << 5) & 0x60U;
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}
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void CNXDNLICH::setFCT(unsigned char usc)
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{
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m_lich &= 0x67U;
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m_lich |= (usc << 3) & 0x18U;
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}
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void CNXDNLICH::setOption(unsigned char option)
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{
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m_lich &= 0x79U;
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m_lich |= (option << 1) & 0x06U;
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}
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void CNXDNLICH::setDirection(unsigned char direction)
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{
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m_lich &= 0x7EU;
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m_lich |= direction & 0x01U;
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}
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CNXDNLICH& CNXDNLICH::operator=(const CNXDNLICH& lich)
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{
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if (&lich != this)
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m_lich = lich.m_lich;
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return *this;
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}
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