added TryGetTableData to avoid Exceptions when a table doesn't exist

binding/Binding/SKTypeface.cs

@@ -140,13 +140,24 @@ namespace SkiaSharp
 			IntPtr dataSize = SkiaApi.sk_typeface_get_table_size(Handle, tag);
 			byte[] result = new byte[(int)dataSize];
 			IntPtr r = SkiaApi.sk_typeface_get_table_data(Handle, tag, IntPtr.Zero, dataSize, result);
-			if (r == IntPtr.Zero)
-			{
+			if (r == IntPtr.Zero) {
 				throw new Exception("Unable to read the data table.");
 			}
 			return result;
 		}
 
+		public bool TryGetTableData(UInt32 tag, out byte[] tableData)
+		{
+			IntPtr dataSize = SkiaApi.sk_typeface_get_table_size(Handle, tag);
+			tableData = new byte[(int)dataSize];
+			IntPtr r = SkiaApi.sk_typeface_get_table_data(Handle, tag, IntPtr.Zero, dataSize, tableData);
+			if (r == IntPtr.Zero) {
+				tableData = null;
+				return false;
+			}
+			return true;
+		}
+
 	}
 }
 

skia

@@ -1 +1 @@
-Subproject commit ee4bd198dfe298511d0d07cec4109654ad68ce78
+Subproject commit 23031d670d5c62325f31f6fb3dcd5091b12f5777

tests/Tests/SKTypefaceTest.cs

@@ -99,5 +99,34 @@ namespace SkiaSharp.Tests
 				Assert.Throws<System.Exception>(() => typeface.GetTableData(8));
 			}
 		}
+
+		[Test]
+		public void TestTryGetTableData()
+		{
+			using (var typeface = SKTypeface.FromFile(Path.Combine(PathToFonts, "ReallyBigA.ttf")))
+			{
+				var tables = typeface.GetTableTags();
+				for (int i = 0; i < tables.Length; i++) {
+					byte[] tableData;
+					Assert.IsTrue(typeface.TryGetTableData(tables[i], out tableData));
+					Assert.AreEqual(ExpectedTableLengthsReallyBigAFont[i], tableData.Length, "Unexpected length for table: " + GetReadableTag(tables[i]));
+				}
+
+				Assert.AreEqual(ExpectedTableDataPostReallyBigAFont, typeface.GetTableData(GetIntTag("post")));
+
+			}
+		}
+
+		[Test]
+		public void InvalidTryGetTableData()
+		{
+			using (var typeface = SKTypeface.FromFile(Path.Combine(PathToFonts, "Distortable.ttf")))
+			{
+				byte[] tableData;
+				Assert.IsFalse(typeface.TryGetTableData(8, out tableData));
+				Assert.IsNull(tableData);
+			}
+		}
+
 	}
 }