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83 lines
2.6 KiB
83 lines
2.6 KiB
/*
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* Copyright (C) 2010,2011,2012 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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#ifndef TCPReaderWriter_H
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#define TCPReaderWriter_H
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#include "StdCompat.h"
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// Platform socket headers.
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#if defined(_WIN32)
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#include <winsock2.h>
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#include <ws2tcpip.h>
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#pragma comment(lib, "ws2_32.lib")
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#else
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#include <netdb.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <errno.h>
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#endif
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/*
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* Thin wrapper around a blocking TCP client socket.
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*
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* open() resolves the remote hostname via CUDPReaderWriter::lookup(), creates
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* a SOCK_STREAM socket, and calls connect(). TCP_NODELAY is set to avoid
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* Nagle buffering delays on small control packets.
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*
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* read() uses select() with a caller-supplied timeout (seconds + milliseconds)
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* so the caller can implement protocol-level timeouts without blocking forever.
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* It returns the number of bytes received, 0 on timeout, or -1 on error.
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*
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* A default-constructed CTCPReaderWriter can be opened later by calling the
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* two-argument open() overload, which also sets the address and port.
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*/
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class CTCPReaderWriter {
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public:
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CTCPReaderWriter(const std::string& address, unsigned int port, const std::string& localAddress = std::string());
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CTCPReaderWriter();
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~CTCPReaderWriter();
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bool open(const std::string& address, unsigned int port, const std::string& localAddress = std::string());
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bool open();
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// Blocks until data arrives or the timeout (secs + msecs) expires.
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// Returns bytes read, 0 on timeout, -1 on error.
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int read(unsigned char* buffer, unsigned int length, unsigned int secs, unsigned int msecs = 0U);
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bool write(const unsigned char* buffer, unsigned int length);
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void close();
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private:
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std::string m_address;
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unsigned short m_port;
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std::string m_localAddress;
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#if defined(_WIN32)
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SOCKET m_fd;
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#else
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int m_fd;
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#endif
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};
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#endif
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