188 lines
3.9 KiB
C++
188 lines
3.9 KiB
C++
/*
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* Copyright (C) 2020 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 "AX25Network.h"
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#include "Defines.h"
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#include "Utils.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 int BUFFER_LENGTH = 500U;
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const unsigned char AX25_KISS_DATA = 0x00U;
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const unsigned char AX25_FEND = 0xC0U;
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const unsigned char AX25_FESC = 0xDBU;
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const unsigned char AX25_TFEND = 0xDCU;
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const unsigned char AX25_TFESC = 0xDDU;
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CAX25Network::CAX25Network(const std::string& port, unsigned int speed, bool debug) :
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m_serial(port, SERIAL_SPEED(speed), false), // XXX
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m_txData(NULL),
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m_rxData(NULL),
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m_rxLength(0U),
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m_rxLastChar(0U),
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m_debug(debug),
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m_enabled(false)
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{
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assert(!port.empty());
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assert(speed > 0U);
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m_txData = new unsigned char[BUFFER_LENGTH];
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m_rxData = new unsigned char[BUFFER_LENGTH];
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}
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CAX25Network::~CAX25Network()
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{
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delete[] m_txData;
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delete[] m_rxData;
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}
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bool CAX25Network::open()
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{
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LogMessage("Opening AX25 network connection");
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return m_serial.open();
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}
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bool CAX25Network::write(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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if (!m_enabled)
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return true;
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unsigned int txLength = 0U;
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m_txData[txLength++] = AX25_FEND;
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m_txData[txLength++] = AX25_KISS_DATA;
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for (unsigned int i = 0U; i < length; i++) {
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unsigned char c = data[i];
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switch (c) {
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case AX25_FEND:
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m_txData[txLength++] = AX25_FESC;
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m_txData[txLength++] = AX25_TFEND;
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break;
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case AX25_FESC:
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m_txData[txLength++] = AX25_FESC;
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m_txData[txLength++] = AX25_TFESC;
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break;
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default:
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m_txData[txLength++] = c;
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break;
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}
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}
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m_txData[txLength++] = AX25_FEND;
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if (m_debug)
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CUtils::dump(1U, "AX25 Network Data Sent", m_txData, txLength);
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return m_serial.write(m_txData, txLength);
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}
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unsigned int CAX25Network::read(unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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bool complete = false;
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unsigned char c;
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while (m_serial.read(&c, 1U) > 0U) {
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if (m_rxLength == 0U && c == AX25_FEND)
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m_rxData[m_rxLength++] = c;
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else if (m_rxLength > 0U)
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m_rxData[m_rxLength++] = c;
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if (m_rxLength > 1U && c == AX25_FEND) {
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complete = true;
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break;
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}
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}
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if (!m_enabled)
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return 0U;
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if (!complete)
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return 0U;
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if (m_rxLength == 0U)
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return 0U;
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if (m_rxData[1U] != AX25_KISS_DATA) {
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m_rxLength = 0U;
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return 0U;
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}
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complete = false;
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unsigned int dataLen = 0U;
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for (unsigned int i = 2U; i < m_rxLength; i++) {
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unsigned char c = m_rxData[i];
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if (c == AX25_FEND) {
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complete = true;
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break;
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} else if (c == AX25_TFEND && m_rxLastChar == AX25_FESC) {
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data[dataLen++] = AX25_FEND;
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} else if (c == AX25_TFESC && m_rxLastChar == AX25_FESC) {
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data[dataLen++] = AX25_FESC;
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} else if (c != AX25_FESC) {
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data[dataLen++] = c;
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}
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m_rxLastChar = c;
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}
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if (!complete)
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return 0U;
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if (m_debug)
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CUtils::dump(1U, "AX25 Network Data Received", m_rxData, m_rxLength);
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m_rxLength = 0U;
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m_rxLastChar = 0U;
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return dataLen;
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}
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void CAX25Network::reset()
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{
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}
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void CAX25Network::close()
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{
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m_serial.close();
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LogMessage("Closing AX25 network connection");
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}
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void CAX25Network::enable(bool enabled)
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{
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m_enabled = enabled;
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if (enabled != m_enabled) {
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m_rxLastChar = 0U;
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m_rxLength = 0U;
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}
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}
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