Initial commit

Conversion of the UWP app into a .NET Core app for portability. Requires .NET Core 2.0 and C# 7.1

Messages/Helper.cs

@@ -0,0 +1,67 @@
+using System;
+using System.Text;
+
+namespace ScreenLogicConnect.Messages
+{
+    public class HLMessageTypeHelper
+    {
+        public static String extractString(sbyte[] data, ref int idx)
+        {
+            String result = "";
+            int startIndex = idx;
+            int bufferLength;
+            int i;
+            if (data[startIndex + 3] < (byte)0)
+            {
+                int i2 = startIndex + 3;
+                data[i2] = (sbyte)(data[i2] + 128);
+                bufferLength = ByteHelper.getIntFromByteArrayLittleEndian(data, idx);
+                if (30000 <= bufferLength)
+                {
+                    return result;
+                }
+                startIndex += 4;
+                for (i = startIndex; i < startIndex + bufferLength; i += 2)
+                {
+                    result = result + ((char)ByteHelper.getShortFromByteArrayAsLittleEndian(data, i));
+                }
+                idx = ((startIndex + bufferLength) + alignToNext4Boundary(bufferLength));
+                return result;
+            }
+            bufferLength = ByteHelper.getIntFromByteArrayLittleEndian(data, idx);
+            if (30000 <= bufferLength)
+            {
+                return result;
+            }
+            startIndex += 4;
+            char[] temp = new char[bufferLength];
+            for (i = startIndex; i < startIndex + bufferLength; i++)
+            {
+                temp[i - startIndex] = (char)(data[i] & 255);
+            }
+            StringBuilder sb = new StringBuilder();
+            sb.Append(temp);
+            result = sb.ToString();
+            idx = ((startIndex + bufferLength) + alignToNext4Boundary(bufferLength));
+            return result;
+        }
+/*
+        public static int extractColor(sbyte[] data, ref int idx)
+        {
+            int startIndex = idx;
+            int r = ByteHelper.getIntFromByteArrayLittleEndian(data, startIndex);
+            startIndex += 4;
+            int g = ByteHelper.getIntFromByteArrayLittleEndian(data, startIndex);
+            startIndex += 4;
+            int b = ByteHelper.getIntFromByteArrayLittleEndian(data, startIndex);
+            idx = startIndex + 4;
+            return Color.rgb(r, g, b);
+        }
+*/
+        private static int alignToNext4Boundary(int val)
+        {
+            int sub = val % 4;
+            return sub == 0 ? 0 : 4 - sub;
+        }
+    }
+}