moved update back to makensisw

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4077 212acab6-be3b-0410-9dea-997c60f758d6

Contrib/Makensisw/jnetlib/asyncdns.h

@@ -0,0 +1,38 @@
+/*
+** JNetLib
+** Copyright (C) 2000-2001 Nullsoft, Inc.
+** Author: Justin Frankel
+** File: asyncdns.h - JNL portable asynchronous DNS interface
+** License: see jnetlib.h
+**
+** Usage:
+**   1. Create JNL_AsyncDNS object, optionally with the number of cache entries.
+**   2. call resolve() to resolve a hostname into an address. The return value of 
+**      resolve is 0 on success (host successfully resolved), 1 on wait (meaning
+**      try calling resolve() with the same hostname in a few hundred milliseconds 
+**      or so), or -1 on error (i.e. the host can't resolve).
+**   4. enjoy.
+*/
+
+#ifndef _ASYNCDNS_H_
+#define _ASYNCDNS_H_
+
+class JNL_AsyncDNS
+{
+public:
+  JNL_AsyncDNS(int max_cache_entries=64);
+  ~JNL_AsyncDNS();
+
+  int resolve(char *hostname, unsigned long *addr); // return 0 on success, 1 on wait, -1 on unresolvable
+
+private:
+  char m_hostname[256];
+  unsigned long m_addr;
+
+  volatile int m_thread_kill;
+  HANDLE m_thread;
+  static unsigned long WINAPI _threadfunc(LPVOID _d);
+
+};
+
+#endif //_ASYNCDNS_H_