MMDVMHost-Private/AX25Network.cpp

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/*
* Copyright (C) 2020 by Jonathan Naylor G4KLX
*
* 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.
*/
#include "AX25Network.h"
#include "Defines.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
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const unsigned int BUFFER_LENGTH = 500U;
const unsigned char AX25_KISS_DATA = 0x00U;
const unsigned char AX25_FEND = 0xC0U;
const unsigned char AX25_FESC = 0xDBU;
const unsigned char AX25_TFEND = 0xDCU;
const unsigned char AX25_TFESC = 0xDDU;
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CAX25Network::CAX25Network(const std::string& port, unsigned int speed, bool debug) :
m_serial(port, SERIAL_SPEED(speed), false), // XXX
m_txData(NULL),
m_txLength(0U),
m_txOffset(0U),
m_rxData(NULL),
m_rxLength(0U),
m_rxComplete(false),
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m_debug(debug),
m_enabled(false)
{
assert(!port.empty());
assert(speed > 0U);
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m_txData = new unsigned char[BUFFER_LENGTH];
m_rxData = new unsigned char[BUFFER_LENGTH];
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}
CAX25Network::~CAX25Network()
{
delete[] m_txData;
delete[] m_rxData;
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}
bool CAX25Network::open()
{
LogMessage("Opening AX25 network connection");
return m_serial.open();
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}
bool CAX25Network::write(const unsigned char* data, unsigned int length)
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{
assert(data != NULL);
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m_txLength = 0U;
m_txOffset = 0U;
m_txData[m_txLength++] = AX25_FEND;
m_txData[m_txLength++] = AX25_KISS_DATA;
for (unsigned int i = 0U; i < length; i++) {
unsigned char c = data[i];
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switch (c) {
case AX25_FEND:
m_txData[m_txLength++] = AX25_FESC;
m_txData[m_txLength++] = AX25_TFEND;
break;
case AX25_FESC:
m_txData[m_txLength++] = AX25_FESC;
m_txData[m_txLength++] = AX25_TFESC;
break;
default:
m_txData[m_txLength++] = c;
break;
}
}
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m_txData[m_txLength++] = AX25_FEND;
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if (m_debug)
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CUtils::dump(1U, "AX25 Network Data Sent", m_txData, m_txLength);
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return m_serial.write(m_txData, m_txLength);
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}
void CAX25Network::reset()
{
}
void CAX25Network::close()
{
m_serial.close();
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LogMessage("Closing AX25 network connection");
}
void CAX25Network::enable(bool enabled)
{
m_enabled = enabled;
}