mcs/class/corlib/CoreFoundation/CFHelpers.cs

   1 #if MONO_FEATURE_APPLETLS || MONO_FEATURE_APPLE_X509
   2 using System;
   3 using System.Runtime.InteropServices;
   4
   5 namespace XamMac.CoreFoundation
   6 {
   7         internal static class CFHelpers
   8         {
   9                 internal const string CoreFoundationLibrary = "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation";
  10                 internal const string SecurityLibrary = "/System/Library/Frameworks/Security.framework/Security";
  11
  12                 [DllImport (CoreFoundationLibrary)]
  13                 internal extern static void CFRelease (IntPtr obj);
  14
  15                 [DllImport (CoreFoundationLibrary)]
  16                 internal extern static IntPtr CFRetain (IntPtr obj);
  17
  18                 [StructLayout (LayoutKind.Sequential)]
  19                 struct CFRange {
  20                         public IntPtr loc;
  21                         public IntPtr len;
  22
  23                         public CFRange (int loc, int len)
  24                                 : this ((long) loc, (long) len)
  25                         {
  26                         }
  27
  28                         public CFRange (long l, long len)
  29                         {
  30                                 this.loc = (IntPtr) l;
  31                                 this.len = (IntPtr) len;
  32                         }
  33                 }
  34
  35                 [DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
  36                 extern static IntPtr CFStringCreateWithCharacters (IntPtr allocator, string str, IntPtr count);
  37
  38                 [DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
  39                 extern static IntPtr CFStringGetLength (IntPtr handle);
  40
  41                 [DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
  42                 extern static IntPtr CFStringGetCharactersPtr (IntPtr handle);
  43
  44                 [DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
  45                 extern static IntPtr CFStringGetCharacters (IntPtr handle, CFRange range, IntPtr buffer);
  46
  47                 internal static string FetchString (IntPtr handle)
  48                 {
  49                         if (handle == IntPtr.Zero)
  50                                 return null;
  51
  52                         string str;
  53
  54                         int l = (int)CFStringGetLength (handle);
  55                         IntPtr u = CFStringGetCharactersPtr (handle);
  56                         IntPtr buffer = IntPtr.Zero;
  57                         if (u == IntPtr.Zero){
  58                                 CFRange r = new CFRange (0, l);
  59                                 buffer = Marshal.AllocCoTaskMem (l * 2);
  60                                 CFStringGetCharacters (handle, r, buffer);
  61                                 u = buffer;
  62                         }
  63                         unsafe {
  64                                 str = new string ((char *) u, 0, l);
  65                         }
  66
  67                         if (buffer != IntPtr.Zero)
  68                                 Marshal.FreeCoTaskMem (buffer);
  69
  70                         return str;
  71                 }
  72
  73                 [DllImport (CoreFoundationLibrary)]
  74                 extern static IntPtr CFDataGetLength (IntPtr handle);
  75
  76                 [DllImport (CoreFoundationLibrary)]
  77                 extern static IntPtr CFDataGetBytePtr (IntPtr handle);
  78
  79                 internal static byte[] FetchDataBuffer (IntPtr handle)
  80                 {
  81                         var length = (int)CFDataGetLength (handle);
  82                         var buffer = new byte [length];
  83                         var ptr = CFDataGetBytePtr (handle);
  84                         Marshal.Copy (ptr, buffer, 0, buffer.Length);
  85                         return buffer;
  86                 }
  87
  88                 [DllImport (CoreFoundationLibrary)]
  89                 extern static IntPtr CFDataCreateWithBytesNoCopy (IntPtr allocator, IntPtr bytes, IntPtr length, IntPtr bytesDeallocator);
  90
  91                 [DllImport (CoreFoundationLibrary)]
  92                 extern static IntPtr CFDataCreate (IntPtr allocator, IntPtr bytes, IntPtr length);
  93
  94                 [DllImport (SecurityLibrary)]
  95                 extern static IntPtr SecCertificateCreateWithData (IntPtr allocator, IntPtr cfData);
  96
  97                 unsafe internal static IntPtr CreateCertificateFromData (byte[] data)
  98                 {
  99                         fixed (void *ptr = data) {
 100                                 var cfdata = CFDataCreate (IntPtr.Zero, (IntPtr)ptr, new IntPtr (data.Length));
 101                                 if (cfdata == IntPtr.Zero)
 102                                         return IntPtr.Zero;
 103
 104                                 var certificate = SecCertificateCreateWithData (IntPtr.Zero, cfdata);
 105                                 if (cfdata != IntPtr.Zero)
 106                                         CFRelease (cfdata);
 107                                 return certificate;
 108                         }
 109                 }
 110         }
 111 }
 112 #endif