From 20458d4b4636defc3e26ddbf66fcf31f90c1ea28 Mon Sep 17 00:00:00 2001
From: Michael Croes <mycroes@gmail.com>
Date: Wed, 10 Oct 2018 21:41:13 +0200
Subject: [PATCH] Add InvalidDataException

---
 S7.Net/InvalidDataException.cs | 43 ++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 S7.Net/InvalidDataException.cs

diff --git a/S7.Net/InvalidDataException.cs b/S7.Net/InvalidDataException.cs
new file mode 100644
index 0000000..560d764
--- /dev/null
+++ b/S7.Net/InvalidDataException.cs
@@ -0,0 +1,43 @@
+using System;
+
+namespace S7.Net
+{
+    #if NET_FULL
+    [Serializable]
+    #endif
+    public class InvalidDataException : Exception
+    {
+        public byte[] ReceivedData { get; }
+        public int ErrorIndex { get; }
+        public byte ExpectedValue { get; }
+
+        public InvalidDataException(string message, byte[] receivedData, int errorIndex, byte expectedValue)
+            : base(FormatMessage(message, receivedData, errorIndex, expectedValue))
+        {
+            ReceivedData = receivedData;
+            ErrorIndex = errorIndex;
+            ExpectedValue = expectedValue;
+        }
+
+        #if NET_FULL
+        protected InvalidDataException(System.Runtime.Serialization.SerializationInfo info,
+            System.Runtime.Serialization.StreamingContext context) : base(info, context)
+        {
+            ReceivedData = (byte[]) info.GetValue(nameof(ReceivedData), typeof(byte[]));
+            ErrorIndex = info.GetInt32(nameof(ErrorIndex));
+            ExpectedValue = info.GetByte(nameof(ExpectedValue));
+        }
+        #endif
+
+        private static string FormatMessage(string message, byte[] receivedData, int errorIndex, byte expectedValue)
+        {
+            if (errorIndex >= receivedData.Length)
+                throw new ArgumentOutOfRangeException(nameof(errorIndex),
+                    $"{nameof(errorIndex)} {errorIndex} is outside the bounds of {nameof(receivedData)} with length {receivedData.Length}.");
+
+            return $"{message} Invalid data received. Expected '{expectedValue}' at index {errorIndex}, " +
+                $"but received {receivedData[errorIndex]}. See the {nameof(ReceivedData)} property " +
+                "for the full message received.";
+        }
+    }
+}
\ No newline at end of file