Adds a modified copy of talk/base to webrtc/base. It is the first step in migrating talk/base to webrtc/base.

BUG=N/A
R=andrew@webrtc.org, wu@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/12199004

git-svn-id: http://webrtc.googlecode.com/svn/trunk@6107 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/base/nethelpers.h

@@ -0,0 +1,65 @@
+/*
+ *  Copyright 2008 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_BASE_NETHELPERS_H_
+#define WEBRTC_BASE_NETHELPERS_H_
+
+#if defined(WEBRTC_POSIX)
+#include <netdb.h>
+#include <stddef.h>
+#elif WEBRTC_WIN
+#include <winsock2.h>  // NOLINT
+#endif
+
+#include <list>
+
+#include "webrtc/base/asyncresolverinterface.h"
+#include "webrtc/base/signalthread.h"
+#include "webrtc/base/sigslot.h"
+#include "webrtc/base/socketaddress.h"
+
+namespace rtc {
+
+class AsyncResolverTest;
+
+// AsyncResolver will perform async DNS resolution, signaling the result on
+// the SignalDone from AsyncResolverInterface when the operation completes.
+class AsyncResolver : public SignalThread, public AsyncResolverInterface {
+ public:
+  AsyncResolver();
+  virtual ~AsyncResolver() {}
+
+  virtual void Start(const SocketAddress& addr);
+  virtual bool GetResolvedAddress(int family, SocketAddress* addr) const;
+  virtual int GetError() const { return error_; }
+  virtual void Destroy(bool wait) { SignalThread::Destroy(wait); }
+
+  const std::vector<IPAddress>& addresses() const { return addresses_; }
+  void set_error(int error) { error_ = error; }
+
+ protected:
+  virtual void DoWork();
+  virtual void OnWorkDone();
+
+ private:
+  SocketAddress addr_;
+  std::vector<IPAddress> addresses_;
+  int error_;
+};
+
+// rtc namespaced wrappers for inet_ntop and inet_pton so we can avoid
+// the windows-native versions of these.
+const char* inet_ntop(int af, const void *src, char* dst, socklen_t size);
+int inet_pton(int af, const char* src, void *dst);
+
+bool HasIPv6Enabled();
+}  // namespace rtc
+
+#endif  // WEBRTC_BASE_NETHELPERS_H_