MMDVMHost-Private/POCSAGNetwork.cpp

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/*
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* Copyright (C) 2018,2019,2020 by Jonathan Naylor G4KLX
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*
* 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 "POCSAGDefines.h"
#include "POCSAGNetwork.h"
#include "Defines.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CPOCSAGNetwork::CPOCSAGNetwork(const std::string& myAddress, unsigned int myPort, const std::string& gatewayAddress, unsigned int gatewayPort, bool debug) :
m_socket(myAddress, myPort),
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m_addr(),
m_addrLen(0U),
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m_debug(debug),
m_enabled(false),
m_buffer(1000U, "POCSAG Network")
{
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if (CUDPSocket::lookup(gatewayAddress, gatewayPort, m_addr, m_addrLen) != 0)
m_addrLen = 0U;
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}
CPOCSAGNetwork::~CPOCSAGNetwork()
{
}
bool CPOCSAGNetwork::open()
{
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if (m_addrLen == 0U) {
LogError("Unable to resolve the address of the DAPNET Gateway");
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return false;
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}
LogMessage("Opening POCSAG network connection");
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return m_socket.open();
}
void CPOCSAGNetwork::clock(unsigned int ms)
{
unsigned char buffer[BUFFER_LENGTH];
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sockaddr_storage address;
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unsigned int addrLen;
int length = m_socket.read(buffer, BUFFER_LENGTH, address, addrLen);
if (length <= 0)
return;
if (!CUDPSocket::match(m_addr, address)) {
LogMessage("POCSAG, packet received from an invalid source");
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return;
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}
if (m_debug)
CUtils::dump(1U, "POCSAG Network Data Received", buffer, length);
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// Invalid packet type?
if (::memcmp(buffer, "POCSAG", 6U) != 0)
return;
if (!m_enabled)
return;
unsigned char len = length - 6U;
m_buffer.addData(&len, 1U);
m_buffer.addData(buffer + 6U, length - 6U);
}
unsigned int CPOCSAGNetwork::read(unsigned char* data)
{
assert(data != NULL);
if (m_buffer.isEmpty())
return 0U;
unsigned char len = 0U;
m_buffer.getData(&len, 1U);
m_buffer.getData(data, len);
return len;
}
void CPOCSAGNetwork::reset()
{
}
void CPOCSAGNetwork::close()
{
m_socket.close();
LogMessage("Closing POCSAG network connection");
}
void CPOCSAGNetwork::enable(bool enabled)
{
if (enabled && !m_enabled)
reset();
else if (!enabled && m_enabled)
m_buffer.clear();
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unsigned char c = enabled ? 0x00U : 0xFFU;
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m_socket.write(&c, 1U, m_addr, m_addrLen);
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m_enabled = enabled;
}