163 lines
3.4 KiB
C++
163 lines
3.4 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 <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(NULL)
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{
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m_lich = new unsigned char[1U];
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m_lich[0U] = lich.m_lich[0U];
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}
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CNXDNLICH::CNXDNLICH() :
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m_lich(NULL)
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{
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m_lich = new unsigned char[1U];
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}
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CNXDNLICH::~CNXDNLICH()
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{
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delete[] m_lich;
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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 int offset = NXDN_FSW_LENGTH_BITS;
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for (unsigned int i = 0U; i < (NXDN_LICH_LENGTH_BITS / 2U); i++, offset += 2U) {
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bool b = READ_BIT1(bytes, offset);
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WRITE_BIT1(m_lich, i, b);
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}
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bool newParity = getParity();
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bool origParity = (m_lich[0U] & 0x01U) == 0x01U;
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return origParity == newParity;
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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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bool parity = getParity();
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if (parity)
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m_lich[0U] |= 0x01U;
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else
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m_lich[0U] &= 0xFEU;
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unsigned int offset = NXDN_FSW_LENGTH_BITS;
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for (unsigned int i = 0U; i < (NXDN_LICH_LENGTH_BITS / 2U); i++) {
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bool b = READ_BIT1(m_lich, i);
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WRITE_BIT1(bytes, offset, b);
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offset++;
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WRITE_BIT1(bytes, offset, true);
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offset++;
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}
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}
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unsigned char CNXDNLICH::getRFCT() const
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{
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return (m_lich[0U] >> 6) & 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[0U] >> 4) & 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[0U] >> 2) & 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[0U] >> 1) & 0x01U;
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}
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unsigned char CNXDNLICH::getRaw() const
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{
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bool parity = getParity();
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if (parity)
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m_lich[0U] |= 0x01U;
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else
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m_lich[0U] &= 0xFEU;
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return m_lich[0U];
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}
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void CNXDNLICH::setRFCT(unsigned char rfct)
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{
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m_lich[0U] &= 0x3FU;
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m_lich[0U] |= (rfct << 6) & 0xC0U;
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}
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void CNXDNLICH::setFCT(unsigned char usc)
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{
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m_lich[0U] &= 0xCFU;
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m_lich[0U] |= (usc << 4) & 0x30U;
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}
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void CNXDNLICH::setOption(unsigned char option)
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{
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m_lich[0U] &= 0xF3U;
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m_lich[0U] |= (option << 2) & 0x0CU;
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}
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void CNXDNLICH::setDirection(unsigned char direction)
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{
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m_lich[0U] &= 0xFDU;
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m_lich[0U] |= (direction << 1) & 0x02U;
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}
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void CNXDNLICH::setRaw(unsigned char lich)
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{
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m_lich[0U] = lich;
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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[0U] = lich.m_lich[0U];
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return *this;
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}
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bool CNXDNLICH::getParity() const
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{
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switch (m_lich[0U] & 0xF0U) {
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case 0x80U:
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case 0xB0U:
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return true;
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default:
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return false;
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}
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}
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