mcs/class/System/Mono.Btls/MonoBtlsObject.cs

   1 //
   2 // MonoBtlsObject.cs
   3 //
   4 // Author:
   5 //       Martin Baulig <martin.baulig@xamarin.com>
   6 //
   7 // Copyright (c) 2016 Xamarin Inc. (http://www.xamarin.com)
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining a copy
  10 // of this software and associated documentation files (the "Software"), to deal
  11 // in the Software without restriction, including without limitation the rights
  12 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  13 // copies of the Software, and to permit persons to whom the Software is
  14 // furnished to do so, subject to the following conditions:
  15 //
  16 // The above copyright notice and this permission notice shall be included in
  17 // all copies or substantial portions of the Software.
  18 //
  19 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  20 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  22 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  23 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  24 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  25 // THE SOFTWARE.
  26 #if SECURITY_DEP && MONO_FEATURE_BTLS
  27 using System;
  28 using System.Threading;
  29 using System.Runtime.InteropServices;
  30 using System.Runtime.CompilerServices;
  31
  32 namespace Mono.Btls
  33 {
  34         abstract class MonoBtlsObject : IDisposable
  35         {
  36                 internal const string BTLS_DYLIB = "libmono-btls-shared";
  37
  38                 internal MonoBtlsObject (MonoBtlsHandle handle)
  39                 {
  40                         this.handle = handle;
  41                 }
  42
  43                 protected internal abstract class MonoBtlsHandle : SafeHandle
  44                 {
  45                         internal MonoBtlsHandle ()
  46                                 : base (IntPtr.Zero, true)
  47                         {
  48                         }
  49
  50                         internal MonoBtlsHandle (IntPtr handle, bool ownsHandle)
  51                                 : base (handle, ownsHandle)
  52                         {
  53                         }
  54
  55                         public override bool IsInvalid {
  56                                 get { return handle == IntPtr.Zero; }
  57                         }
  58                 }
  59
  60                 internal MonoBtlsHandle Handle {
  61                         get {
  62                                 CheckThrow ();
  63                                 return handle;
  64                         }
  65                 }
  66
  67                 public bool IsValid {
  68                         get { return handle != null && !handle.IsInvalid; }
  69                 }
  70
  71                 MonoBtlsHandle handle;
  72                 Exception lastError;
  73
  74                 protected void CheckThrow ()
  75                 {
  76                         if (lastError != null)
  77                                 throw lastError;
  78                         if (handle == null || handle.IsInvalid)
  79                                 throw new ObjectDisposedException ("MonoBtlsSsl");
  80                 }
  81
  82                 protected Exception SetException (Exception ex)
  83                 {
  84                         if (lastError == null)
  85                                 lastError = ex;
  86                         return ex;
  87                 }
  88
  89                 protected void CheckError (bool ok, [CallerMemberName] string callerName = null)
  90                 {
  91                         if (!ok) {
  92                                 if (callerName != null)
  93                                         throw new MonoBtlsException ("{0}.{1} failed.", GetType ().Name, callerName);
  94                                 else
  95                                         throw new MonoBtlsException ();
  96                         }
  97
  98                 }
  99
 100                 protected void CheckError (int ret, [CallerMemberName] string callerName = null)
 101                 {
 102                         CheckError (ret == 1, callerName);
 103                 }
 104
 105                 [DllImport (BTLS_DYLIB)]
 106                 extern static void mono_btls_free (IntPtr data);
 107
 108                 protected void FreeDataPtr (IntPtr data)
 109                 {
 110                         mono_btls_free (data);
 111                 }
 112
 113                 protected virtual void Close ()
 114                 {
 115                 }
 116
 117                 protected void Dispose (bool disposing)
 118                 {
 119                         if (disposing) {
 120                                 try {
 121                                         if (handle != null) {
 122                                                 Close ();
 123                                                 handle.Dispose ();
 124                                                 handle = null;
 125                                         }
 126                                 } finally {
 127                                         var disposedExc = new ObjectDisposedException (GetType ().Name);
 128                                         Interlocked.CompareExchange (ref lastError, disposedExc, null);
 129                                 }
 130                         }
 131                 }
 132
 133                 public void Dispose ()
 134                 {
 135                         Dispose (true);
 136                         GC.SuppressFinalize (this);
 137                 }
 138
 139                 ~MonoBtlsObject ()
 140                 {
 141                         Dispose (false);
 142                 }
 143         }
 144 }
 145 #endif