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