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// 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;
using System.Diagnostics;
namespace WixToolset.Dtf.Tools.DDiff
{
public class TextFileDiffEngine : IDiffEngine
{
public TextFileDiffEngine()
{
}
private bool IsTextFile(string file)
{
// Guess whether this is a text file by reading the first few bytes and checking for non-ascii chars.
bool isText = true;
FileStream stream = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
byte[] buf = new byte[256];
int count = stream.Read(buf, 0, buf.Length);
for(int i = 0; i < count; i++)
{
if((buf[i] & 0x80) != 0)
{
isText = false;
break;
}
}
stream.Close();
return isText;
}
public float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory)
{
if(diffInput1 != null && File.Exists(diffInput1) &&
diffInput2 != null && File.Exists(diffInput2) &&
(IsTextFile(diffInput1) && IsTextFile(diffInput2)))
{
return .70f;
}
else
{
return 0;
}
}
public bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory)
{
try
{
bool difference = false;
ProcessStartInfo psi = new ProcessStartInfo("diff.exe");
psi.Arguments = String.Format("\"{0}\" \"{1}\"", diffInput1, diffInput2);
psi.WorkingDirectory = null;
psi.UseShellExecute = false;
psi.WindowStyle = ProcessWindowStyle.Hidden;
psi.RedirectStandardOutput = true;
Process proc = Process.Start(psi);
string line;
while((line = proc.StandardOutput.ReadLine()) != null)
{
diffOutput.WriteLine("{0}{1}", linePrefix, line);
difference = true;
}
proc.WaitForExit();
return difference;
}
catch(System.ComponentModel.Win32Exception) // If diff.exe is not found, just compare the bytes
{
return new FileDiffEngine().GetDiff(diffInput1, diffInput2, options, diffOutput, linePrefix, diffFactory);
}
}
public IDiffEngine Clone()
{
return new TextFileDiffEngine();
}
}
}
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