add initial mono bindings

[catta] / avahi-sharp / ServiceTypeBrowser.cs

diff --git a/avahi-sharp/ServiceTypeBrowser.cs b/avahi-sharp/ServiceTypeBrowser.cs
new file mode 100644 (file)
index 0000000..0334b96
--- /dev/null
+++ b/avahi-sharp/ServiceTypeBrowser.cs
@@ -0,0 +1,139 @@
+using System;
+using System.Collections;
+using System.Runtime.InteropServices;
+
+namespace Avahi
+{
+    internal delegate void ServiceTypeBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
+                                                       IntPtr type, IntPtr domain, IntPtr userdata);
+    
+    public struct ServiceTypeInfo
+    {
+        public int NetworkInterface;
+        public Protocol Protocol;
+        public string Domain;
+        public string ServiceType;
+    }
+
+    public delegate void ServiceTypeInfoHandler (object o, ServiceTypeInfo info);
+    
+    public class ServiceTypeBrowser : IDisposable
+    {
+        private IntPtr handle;
+        private ArrayList infos = new ArrayList ();
+        private Client client;
+        private int iface;
+        private Protocol proto;
+        private string domain;
+
+        private ArrayList addListeners = new ArrayList ();
+        private ArrayList removeListeners = new ArrayList ();
+        
+        [DllImport ("avahi-client")]
+        private static extern IntPtr avahi_service_type_browser_new (IntPtr client, int iface, int proto,
+                                                                     IntPtr domain, ServiceTypeBrowserCallback cb,
+                                                                     IntPtr userdata);
+
+        [DllImport ("avahi-client")]
+        private static extern void avahi_service_type_browser_free (IntPtr handle);
+
+        public event ServiceTypeInfoHandler ServiceTypeAdded
+        {
+            add {
+                addListeners.Add (value);
+                Start ();
+            }
+            remove {
+                addListeners.Remove (value);
+                Stop (false);
+            }
+        }
+        
+        public event ServiceTypeInfoHandler ServiceTypeRemoved
+        {
+            add {
+                removeListeners.Add (value);
+                Start ();
+            }
+            remove {
+                removeListeners.Remove (value);
+                Stop (false);
+            }
+        }
+
+        public ServiceTypeInfo[] ServiceTypes
+        {
+            get { return (ServiceTypeInfo[]) infos.ToArray (typeof (ServiceTypeInfo)); }
+        }
+
+        public ServiceTypeBrowser (Client client) : this (client, client.DomainName)
+        {
+        }
+
+        public ServiceTypeBrowser (Client client, string domain) : this (client, -1, Protocol.Unspecified, domain)
+        {
+        }
+        
+        public ServiceTypeBrowser (Client client, int iface, Protocol proto, string domain)
+        {
+            this.client = client;
+            this.iface = iface;
+            this.proto = proto;
+            this.domain = domain;
+        }
+
+        ~ServiceTypeBrowser ()
+        {
+            Dispose ();
+        }
+
+        public void Dispose ()
+        {
+            Stop (true);
+        }
+
+        private void Start ()
+        {
+            if (handle != IntPtr.Zero || (addListeners.Count == 0 && removeListeners.Count == 0))
+                return;
+
+            IntPtr domainPtr = Utility.StringToPtr (domain);
+            handle = avahi_service_type_browser_new (client.Handle, iface, (int) proto, domainPtr,
+                                                     OnServiceTypeBrowserCallback, IntPtr.Zero);
+            Utility.Free (domainPtr);
+        }
+
+        private void Stop (bool force)
+        {
+            if (handle != IntPtr.Zero && (force || (addListeners.Count == 0 && removeListeners.Count == 0))) {
+                avahi_service_type_browser_free (handle);
+                handle = IntPtr.Zero;
+            }
+        }
+
+        private void OnServiceTypeBrowserCallback (IntPtr browser, int iface, Protocol proto, BrowserEvent bevent,
+                                                   IntPtr type, IntPtr domain, IntPtr userdata)
+        {
+
+            ServiceTypeInfo info;
+            info.NetworkInterface = iface;
+            info.Protocol = proto;
+            info.Domain = Utility.PtrToString (domain);
+            info.ServiceType = Utility.PtrToString (type);
+
+            infos.Add (info);
+            
+            if (bevent == BrowserEvent.Added) {
+                infos.Add (info);
+
+                foreach (ServiceTypeInfoHandler handler in addListeners)
+                    handler (this, info);
+            } else {
+                infos.Remove (info);
+
+                foreach (ServiceTypeInfoHandler handler in removeListeners)
+                    handler (this, info);
+            }
+        }
+    }
+}