From 3f583916719eeef598d10a5d4e14ef14f008243b Mon Sep 17 00:00:00 2001
From: Rob Mensching <rob@firegiant.com>
Date: Tue, 11 May 2021 07:36:37 -0700
Subject: Merge Dtf

---
 src/samples/Dtf/DDiff/FileDiffEngine.cs | 83 +++++++++++++++++++++++++++++++++
 1 file changed, 83 insertions(+)
 create mode 100644 src/samples/Dtf/DDiff/FileDiffEngine.cs

(limited to 'src/samples/Dtf/DDiff/FileDiffEngine.cs')

diff --git a/src/samples/Dtf/DDiff/FileDiffEngine.cs b/src/samples/Dtf/DDiff/FileDiffEngine.cs
new file mode 100644
index 00000000..20ecd857
--- /dev/null
+++ b/src/samples/Dtf/DDiff/FileDiffEngine.cs
@@ -0,0 +1,83 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+using System;
+using System.IO;
+
+namespace WixToolset.Dtf.Samples.DDiff
+{
+	public class FileDiffEngine : IDiffEngine
+	{
+		public FileDiffEngine()
+		{
+		}
+
+		public virtual float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory)
+		{
+			if(diffInput1 != null && File.Exists(diffInput1) &&
+			   diffInput2 != null && File.Exists(diffInput2))
+			{
+				return .10f;
+			}
+			else
+			{
+				return 0;
+			}
+		}
+
+		public bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory)
+		{
+			bool difference = false;
+
+			FileInfo file1 = new FileInfo(diffInput1);
+			FileInfo file2 = new FileInfo(diffInput2);
+
+			if(file1.Length != file2.Length)
+			{
+				diffOutput.WriteLine("{0}File size: {1} -> {2}", linePrefix, file1.Length, file2.Length);
+				difference = true;
+			}
+			else
+			{
+				FileStream stream1 = file1.Open(FileMode.Open, FileAccess.Read, FileShare.Read);
+				FileStream stream2 = file2.Open(FileMode.Open, FileAccess.Read, FileShare.Read);
+
+				byte[] buf1 = new byte[512];
+				byte[] buf2 = new byte[512];
+
+				while(!difference)
+				{
+					int count1 = stream1.Read(buf1, 0, buf1.Length);
+					int count2 = stream2.Read(buf2, 0, buf2.Length);
+
+					for(int i = 0; i < count1; i++)
+					{
+						if(i == count2 || buf1[i] != buf2[i])
+						{
+							difference = true;
+							break;
+						}
+					}
+					if(count1 < buf1.Length) // EOF
+					{
+						break;
+					}
+				}
+
+				stream1.Close();
+				stream2.Close();
+
+				if(difference)
+				{
+					diffOutput.WriteLine("{0}Files differ.", linePrefix);
+				}
+			}
+
+			return difference;
+		}
+
+		public virtual IDiffEngine Clone()
+		{
+			return new FileDiffEngine();
+		}
+	}
+}
-- 
cgit v1.2.3-55-g6feb