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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 WixToolset.Dtf.WindowsInstaller;
namespace WixToolset.Dtf.Tools.DDiff
{
public class VersionedFileDiffEngine : IDiffEngine
{
public VersionedFileDiffEngine()
{
}
private bool IsVersionedFile(string file)
{
return Installer.GetFileVersion(file) != "";
}
public float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory)
{
if(diffInput1 != null && File.Exists(diffInput1) &&
diffInput2 != null && File.Exists(diffInput2) &&
(IsVersionedFile(diffInput1) || IsVersionedFile(diffInput2)))
{
return .20f;
}
else
{
return 0;
}
}
public bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory)
{
bool difference = false;
string ver1 = Installer.GetFileVersion(diffInput1);
string ver2 = Installer.GetFileVersion(diffInput2);
if(ver1 != ver2)
{
diffOutput.WriteLine("{0}File version: {1} -> {2}", linePrefix, ver1, ver2);
difference = true;
}
else
{
FileStream stream1 = new FileStream(diffInput1, FileMode.Open, FileAccess.Read, FileShare.Read);
FileStream stream2 = new FileStream(diffInput2, 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}File versions match but bits differ.", linePrefix);
}
}
return difference;
}
public IDiffEngine Clone()
{
return new VersionedFileDiffEngine();
}
}
}
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