Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/corlib/CoreFoundation/CFHelpers.cs

@@ -0,0 +1,110 @@
+using System;
+using System.Runtime.InteropServices;
+
+namespace XamMac.CoreFoundation
+{
+	internal static class CFHelpers
+	{
+		internal const string CoreFoundationLibrary = "/System/Library/Frameworks/CoreFoundation.framework/CoreFoundation";
+		internal const string SecurityLibrary = "/System/Library/Frameworks/Security.framework/Security";
+
+		[DllImport (CoreFoundationLibrary)]
+		internal extern static void CFRelease (IntPtr obj);
+
+		[DllImport (CoreFoundationLibrary)]
+		internal extern static IntPtr CFRetain (IntPtr obj);
+
+		[StructLayout (LayoutKind.Sequential)]
+		struct CFRange {
+			public IntPtr loc;
+			public IntPtr len;
+
+			public CFRange (int loc, int len)
+				: this ((long) loc, (long) len)
+			{
+			}
+
+			public CFRange (long l, long len)
+			{
+				this.loc = (IntPtr) l;
+				this.len = (IntPtr) len;
+			}
+		}
+
+		[DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
+		extern static IntPtr CFStringCreateWithCharacters (IntPtr allocator, string str, IntPtr count);
+
+		[DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
+		extern static IntPtr CFStringGetLength (IntPtr handle);
+
+		[DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
+		extern static IntPtr CFStringGetCharactersPtr (IntPtr handle);
+
+		[DllImport (CoreFoundationLibrary, CharSet=CharSet.Unicode)]
+		extern static IntPtr CFStringGetCharacters (IntPtr handle, CFRange range, IntPtr buffer);
+
+		internal static string FetchString (IntPtr handle)
+		{
+			if (handle == IntPtr.Zero)
+				return null;
+
+			string str;
+
+			int l = (int)CFStringGetLength (handle);
+			IntPtr u = CFStringGetCharactersPtr (handle);
+			IntPtr buffer = IntPtr.Zero;
+			if (u == IntPtr.Zero){
+				CFRange r = new CFRange (0, l);
+				buffer = Marshal.AllocCoTaskMem (l * 2);
+				CFStringGetCharacters (handle, r, buffer);
+				u = buffer;
+			}
+			unsafe {
+				str = new string ((char *) u, 0, l);
+			}
+
+			if (buffer != IntPtr.Zero)
+				Marshal.FreeCoTaskMem (buffer);
+
+			return str;
+		}
+
+		[DllImport (CoreFoundationLibrary)]
+		extern static IntPtr CFDataGetLength (IntPtr handle);
+
+		[DllImport (CoreFoundationLibrary)]
+		extern static IntPtr CFDataGetBytePtr (IntPtr handle);
+
+		internal static byte[] FetchDataBuffer (IntPtr handle)
+		{
+			var length = (int)CFDataGetLength (handle);
+			var buffer = new byte [length];
+			var ptr = CFDataGetBytePtr (handle);
+			Marshal.Copy (ptr, buffer, 0, buffer.Length);
+			return buffer;
+		}
+
+		[DllImport (CoreFoundationLibrary)]
+		extern static IntPtr CFDataCreateWithBytesNoCopy (IntPtr allocator, IntPtr bytes, IntPtr length, IntPtr bytesDeallocator);
+
+		[DllImport (CoreFoundationLibrary)]
+		extern static IntPtr CFDataCreate (IntPtr allocator, IntPtr bytes, IntPtr length);
+
+		[DllImport (SecurityLibrary)]
+		extern static IntPtr SecCertificateCreateWithData (IntPtr allocator, IntPtr cfData);
+
+		unsafe internal static IntPtr CreateCertificateFromData (byte[] data)
+		{
+			fixed (void *ptr = data) {
+				var cfdata = CFDataCreate (IntPtr.Zero, (IntPtr)ptr, new IntPtr (data.Length));
+				if (cfdata == IntPtr.Zero)
+					return IntPtr.Zero;
+
+				var certificate = SecCertificateCreateWithData (IntPtr.Zero, cfdata);
+				if (cfdata != IntPtr.Zero)
+					CFRelease (cfdata);
+				return certificate;
+			}
+		}
+	}
+}