97 lines
2.5 KiB
C++
97 lines
2.5 KiB
C++
/*
|
|
* Copyright (C) 2021 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 "UDPController.h"
|
|
#include "Log.h"
|
|
|
|
#include <cstring>
|
|
#include <cassert>
|
|
|
|
const unsigned int BUFFER_LENGTH = 600U;
|
|
|
|
CUDPController::CUDPController(const std::string& modemAddress, unsigned int modemPort, const std::string& localAddress, unsigned int localPort) :
|
|
m_socket(localAddress, localPort),
|
|
m_addr(),
|
|
m_addrLen(0U),
|
|
m_buffer(2000U, "UDP Controller Ring Buffer")
|
|
{
|
|
assert(!modemAddress.empty());
|
|
assert(modemPort > 0U);
|
|
assert(localPort > 0U);
|
|
|
|
if (CUDPSocket::lookup(modemAddress, modemPort, m_addr, m_addrLen) != 0)
|
|
m_addrLen = 0U;
|
|
}
|
|
|
|
CUDPController::~CUDPController()
|
|
{
|
|
}
|
|
|
|
bool CUDPController::open()
|
|
{
|
|
if (m_addrLen == 0U) {
|
|
LogError("Unable to resolve the address of the modem");
|
|
return false;
|
|
}
|
|
|
|
return m_socket.open(m_addr);
|
|
}
|
|
|
|
int CUDPController::read(unsigned char* buffer, unsigned int length)
|
|
{
|
|
assert(buffer != NULL);
|
|
assert(length > 0U);
|
|
|
|
unsigned char data[BUFFER_LENGTH];
|
|
sockaddr_storage addr;
|
|
unsigned int addrLen;
|
|
int ret = m_socket.read(data, BUFFER_LENGTH, addr, addrLen);
|
|
|
|
// An error occurred on the socket
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
// Add new data to the ring buffer
|
|
if (ret > 0) {
|
|
if (CUDPSocket::match(addr, m_addr))
|
|
m_buffer.addData(data, ret);
|
|
}
|
|
|
|
// Get required data from the ring buffer
|
|
unsigned int avail = m_buffer.dataSize();
|
|
if (avail < length)
|
|
length = avail;
|
|
|
|
if (length > 0U)
|
|
m_buffer.getData(buffer, length);
|
|
|
|
return int(length);
|
|
}
|
|
|
|
int CUDPController::write(const unsigned char* buffer, unsigned int length)
|
|
{
|
|
assert(buffer != NULL);
|
|
assert(length > 0U);
|
|
|
|
return m_socket.write(buffer, length, m_addr, m_addrLen) ? int(length) : -1;
|
|
}
|
|
|
|
void CUDPController::close()
|
|
{
|
|
m_socket.close();
|
|
}
|