adding testcase for digest value in sum-file

VectoCore/VectoCore/Utils/DataIntegrityHelper.cs

+using System.Linq;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace TUGraz.VectoCore.Utils
+{
+	public class DataIntegrityHelper
+	{
+		public static string ComputeDigestValue(string[] lines)
+		{
+			var hash = System.Convert.ToBase64String(GetHash(string.Join("\n", lines)));
+
+			return string.Format("SHA256: {0}", hash);
+		}
+
+		public static byte[] GetHash(string inputString)
+		{
+			HashAlgorithm algorithm = SHA256.Create();  
+			return algorithm.ComputeHash(Encoding.UTF8.GetBytes(inputString));
+		}
+	}
+}

VectoCore/VectoCore/VectoCore.csproj

@@ -222,6 +222,7 @@
     <Compile Include="OutputData\XML\XMLDeclarationWriter.cs" />
     <Compile Include="OutputData\XML\XMLEngineeringWriter.cs" />
     <Compile Include="OutputData\XML\XMLManufacturerReport.cs" />
+    <Compile Include="Utils\DataIntegrityHelper.cs" />
     <Compile Include="Utils\MeanShiftClustering.cs" />
     <Compile Include="Utils\ProviderExtensions.cs" />
     <Compile Include="Models\Declaration\AirDrag.cs" />

VectoCore/VectoCoreTest/Algorithms/CSVDigestValueTest.cs

+using System.Collections.Generic;
+using System.Data;
+using System.IO;
+using System.Linq;
+using NUnit.Framework;
+using NUnit.Framework.Internal;
+using TUGraz.VectoCommon.Utils;
+using TUGraz.VectoCore.Utils;
+
+namespace TUGraz.VectoCore.Tests.Algorithms
+{
+	[TestFixture]
+	public class CSVDigestValueTest
+	{
+
+		[TestCase]
+		public void TestDigestValueCreation()
+		{
+			var tbl = CreateDataTable(new[] { "t", "dt", "v" }, 5);
+
+			var str = new MemoryStream();
+			var writer = new StreamWriter(str);
+			VectoCSVFile.Write(writer, tbl, true, true);
+
+			writer.Flush();
+			str.Flush();
+			str.Seek(0, SeekOrigin.Begin);
+
+			var reader = new StreamReader(str);
+			var lines = new List<string>();
+			while (!reader.EndOfStream)
+				lines.Add(reader.ReadLine());
+
+			var last = lines.Last();
+
+			Assert.IsTrue(last.StartsWith("#@"), "Digest Identifier not found");
+			Assert.IsTrue(last.Contains("SHA256"), "Digest descriptor SHA256 not found");
+		}
+
+		[TestCase]
+		public void TestDigestValueValidation()
+		{
+			var tbl = CreateDataTable(new[] { "t", "dt", "v" }, 5);
+
+			var str = new MemoryStream();
+			var writer = new StreamWriter(str);
+			VectoCSVFile.Write(writer, tbl, true, true);
+
+			writer.Flush();
+			str.Flush();
+			str.Seek(0, SeekOrigin.Begin);
+
+			var reader = new StreamReader(str);
+			var lines = new List<string>();
+			while (!reader.EndOfStream)
+				lines.Add(reader.ReadLine());
+
+			var last = lines.Last();
+
+			Assert.IsTrue(last.StartsWith("#@"), "Digest Identifier not found");
+			Assert.IsTrue(last.Contains("SHA256"), "Digest descriptor SHA256 not found");
+
+			var otherLines = lines.Where(x => !x.StartsWith("#@")).ToArray();
+
+			var digest = DataIntegrityHelper.ComputeDigestValue(otherLines);
+
+			Assert.AreEqual(string.Format("#@ {0}", digest), last);
+		}
+
+		private static DataTable CreateDataTable(string[] cols, int numRows)
+		{
+			var tbl = new DataTable();
+			
+			foreach (var col in cols) {
+				tbl.Columns.Add(col, typeof(double));
+			}
+
+			var rnd = new Randomizer(873);
+			for (var i = 0; i < numRows; i++) {
+				var row = tbl.NewRow();
+				foreach (var col in cols) {
+					row[col] = rnd.NextDouble(100);
+				}
+
+				tbl.Rows.Add(row);
+			}
+
+			return tbl;
+		}
+
+
+		
+	}
+}

VectoCore/VectoCoreTest/VectoCoreTest.csproj

@@ -77,6 +77,7 @@
     <Otherwise />
   </Choose>
   <ItemGroup>
+    <Compile Include="Algorithms\CSVDigestValueTest.cs" />
     <Compile Include="Algorithms\MeanShiftClusteringTest.cs" />
     <Compile Include="Dummy\EngineFLDTest.cs" />
     <Compile Include="Exceptions\ExceptionTests.cs" />