asyncudpsocket.cxx

由GOOGLE的JINGLE项目中移植的网络库

/*
 * libjingle
 * Copyright 2004--2005, Google Inc.
 *
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright notice, 
 *     this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright notice,
 *     this list of conditions and the following disclaimer in the documentation
 *     and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products 
 *     derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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 */

#if defined(_MSC_VER) && _MSC_VER < 1300
#pragma warning(disable:4786 4530)
#endif
#include "asyncudpsocket.h"
#include <cassert>
#include <cstring>

namespace cricket {

const int BUF_SIZE = 64 * 1024;

AsyncUDPSocket::AsyncUDPSocket(AsyncSocket* socket) : AsyncPacketSocket(socket) {
  size_ = BUF_SIZE;
  buf_ = new char[size_];

  assert(socket_);
  // The socket should start out readable but not writable.
  socket_->SignalReadEvent.connect(this, &AsyncUDPSocket::OnReadEvent);
}

AsyncUDPSocket::~AsyncUDPSocket() {
  delete [] buf_;
}

void AsyncUDPSocket::OnReadEvent(AsyncSocket* socket) {
  assert(socket == socket_);

  SocketAddress remote_addr;
  int len = socket_->RecvFrom(buf_, size_, &remote_addr);
  if (len < 0) {
    // TODO: Do something better like forwarding the error to the user.    
    return;
  }

  // TODO: Make sure that we got all of the packet.  If we did not, then we
  // should resize our buffer to be large enough.

  SignalReadPacket(buf_, (size_t)len, remote_addr, this);
}

} // namespace cricket