mcs/class/corlib/CoreFoundation/CFHelpers.cs

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