NXDNClients/NXDNParrot/Network.cpp

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2018-03-13 18:16:48 -04:00
/*
* Copyright (C) 2009-2014,2016,2018 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 "Network.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CNetwork::CNetwork(unsigned int port) :
m_socket(port),
m_address(),
m_port(0U),
m_buffer(1000U, "NXDN Network")
{
}
CNetwork::~CNetwork()
{
}
bool CNetwork::open()
{
::fprintf(stdout, "Opening NXDN network connection\n");
return m_socket.open();
}
bool CNetwork::write(const unsigned char* data, unsigned int length)
{
if (m_port == 0U)
return true;
assert(data != NULL);
return m_socket.write(data, length, m_address, m_port);
}
void CNetwork::clock(unsigned int ms)
{
unsigned char buffer[BUFFER_LENGTH];
in_addr address;
unsigned int port;
int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
if (length <= 0)
return;
m_address.s_addr = address.s_addr;
m_port = port;
if (::memcmp(buffer, "NXDNP", 5U) == 0) { // A poll
write(buffer, length);
} else if (::memcmp(buffer, "NXDND", 5U) == 0) {
unsigned char l = length;
m_buffer.addData(&l, 1U);
m_buffer.addData(buffer, length);
}
}
unsigned int CNetwork::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 CNetwork::end()
{
m_port = 0U;
}
void CNetwork::close()
{
m_socket.close();
::fprintf(stdout, "Closing NXDN network connection\n");
}