Extract S7ValueConverter

Sharp7.Rx/S7ValueConverter.cs

@@ -0,0 +1,76 @@
+using System;
+using System.Linq;
+using System.Text;
+using Sharp7.Rx.Enums;
+
+namespace Sharp7.Rx
+{
+    internal static class S7ValueConverter
+    {
+        public static TValue ConvertToType<TValue>(byte[] buffer, S7VariableAddress address)
+        {
+            if (typeof(TValue) == typeof(bool))
+            {
+                return (TValue) (object) Convert.ToBoolean(buffer[0] & (1 << address.Bit));
+            }
+
+            if (typeof(TValue) == typeof(int))
+            {
+                if (address.Length == 2)
+                    return (TValue)(object)((buffer[0] << 8) + buffer[1]);
+                if (address.Length == 4)
+                {
+                    Array.Reverse(buffer);
+                    return (TValue)(object)BitConverter.ToInt32(buffer,0);
+                }
+
+                throw new InvalidOperationException($"length must be 2 or 4 but is {address.Length}");
+            }
+
+            if (typeof(TValue) == typeof(long))
+            {
+                Array.Reverse(buffer);
+                return (TValue)(object)BitConverter.ToInt64(buffer,0);
+            }
+
+            if (typeof(TValue) == typeof(ulong))
+            {
+                Array.Reverse(buffer);
+                return (TValue)(object)BitConverter.ToUInt64(buffer, 0);
+            }
+
+            if (typeof(TValue) == typeof(short))
+            {
+                return (TValue)(object)(short)((buffer[0] << 8) + buffer[1]);
+            }
+
+            if (typeof(TValue) == typeof(byte) || typeof(TValue) == typeof(char))
+            {
+                return (TValue)(object)buffer[0];
+            }
+
+            if (typeof(TValue) == typeof(byte[]))
+            {
+                return (TValue)(object)buffer;
+            }
+
+            if (typeof(TValue) == typeof(double) || typeof(TValue) == typeof(float))
+            {
+                var d = BitConverter.ToSingle(buffer.Reverse().ToArray(),0);
+                return (TValue)(object)d;
+            }
+
+            if (typeof(TValue) == typeof(string))
+                if (address.Type == DbType.String)
+                {
+                    return (TValue) (object) Encoding.ASCII.GetString(buffer);
+                }
+                else
+                {
+                    return (TValue) (object) Encoding.ASCII.GetString(buffer).Trim();
+                }
+
+            throw new InvalidOperationException(string.Format("type '{0}' not supported.", typeof(TValue)));
+        }
+    }
+}