Make sure we can create a typeface from non-seekable streams

binding/Binding/SKTypeface.cs

@@ -62,6 +62,21 @@ namespace SkiaSharp
 		{
 			if (stream == null)
 				throw new ArgumentNullException (nameof (stream));
+
+			if (!stream.CanSeek)
+			{
+				var fontStream = new MemoryStream ();
+				stream.CopyTo (fontStream);
+				fontStream.Flush ();
+				fontStream.Position = 0;
+
+				stream.Dispose ();
+				stream = null;
+
+				stream = fontStream;
+				fontStream = null;
+			}
+
 			return FromStream (new SKManagedStream (stream, true), index);
 		}
 
@@ -74,6 +89,11 @@ namespace SkiaSharp
 			return typeface;
 		}
 
+		public static SKTypeface FromData (SKData data, int index = 0)
+		{
+			return SKTypeface.FromStream (new SKMemoryStream (data), index);
+		}
+
 		public int CountGlyphs (string str)
 		{
 			if (str == null)

tests/Tests/SKTypefaceTest.cs

@@ -142,5 +142,26 @@ namespace SkiaSharp.Tests
 			}
 		}
 
+		[Test]
+		public void CanReadData()
+		{
+			var bytes = File.ReadAllBytes(Path.Combine(PathToFonts, "Distortable.ttf"));
+			using (var data = SKData.CreateCopy(bytes))
+			using (var typeface = SKTypeface.FromData(data))
+			{
+				Assert.IsNotNull(typeface);
+			}
+		}
+
+		[Test]
+		public void CanReadNonSeekableStream()
+		{
+			using (var stream = File.OpenRead(Path.Combine(PathToFonts, "Distortable.ttf")))
+			using (var nonSeekable = new NonSeekableReadOnlyStream(stream))
+			using (var typeface = SKTypeface.FromStream(nonSeekable))
+			{
+				Assert.IsNotNull(typeface);
+			}
+		}
 	}
 }