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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.Collections;
using System.Collections.Generic;
using WixToolset.Dtf.Compression.Cab;
namespace WixToolset.Dtf.Tools.DDiff
{
public class CabDiffEngine : IDiffEngine
{
public CabDiffEngine()
{
}
private bool IsCabinetFile(string file)
{
using(FileStream fileStream = File.OpenRead(file))
{
return new CabEngine().IsArchive(fileStream);
}
}
public virtual float GetDiffQuality(string diffInput1, string diffInput2, string[] options, IDiffEngineFactory diffFactory)
{
if(diffInput1 != null && File.Exists(diffInput1) &&
diffInput2 != null && File.Exists(diffInput2) &&
(IsCabinetFile(diffInput1) || IsCabinetFile(diffInput2)))
{
return .80f;
}
else
{
return 0;
}
}
public bool GetDiff(string diffInput1, string diffInput2, string[] options, TextWriter diffOutput, string linePrefix, IDiffEngineFactory diffFactory)
{
bool difference = false;
IComparer caseInsComp = CaseInsensitiveComparer.Default;
// TODO: Make this faster by extracting the whole cab at once.
// TODO: Optimize for the match case by first comparing the whole cab files.
CabInfo cab1 = new CabInfo(diffInput1);
CabInfo cab2 = new CabInfo(diffInput2);
IList<CabFileInfo> cabFilesList1 = cab1.GetFiles();
IList<CabFileInfo> cabFilesList2 = cab2.GetFiles();
CabFileInfo[] cabFiles1 = new CabFileInfo[cabFilesList1.Count];
CabFileInfo[] cabFiles2 = new CabFileInfo[cabFilesList2.Count];
cabFilesList1.CopyTo(cabFiles1, 0);
cabFilesList2.CopyTo(cabFiles2, 0);
string[] files1 = new string[cabFiles1.Length];
string[] files2 = new string[cabFiles2.Length];
for(int i1 = 0; i1 < cabFiles1.Length; i1++) files1[i1] = cabFiles1[i1].Name;
for(int i2 = 0; i2 < cabFiles2.Length; i2++) files2[i2] = cabFiles2[i2].Name;
Array.Sort(files1, cabFiles1, caseInsComp);
Array.Sort(files2, cabFiles2, caseInsComp);
for(int i1 = 0, i2 = 0; i1 < files1.Length || i2 < files2.Length; )
{
int comp;
if(i1 == files1.Length)
{
comp = 1;
}
else if(i2 == files2.Length)
{
comp = -1;
}
else
{
comp = caseInsComp.Compare(files1[i1], files2[i2]);
}
if(comp < 0)
{
diffOutput.WriteLine("{0}< {1}", linePrefix, files1[i1]);
i1++;
difference = true;
}
else if(comp > 0)
{
diffOutput.WriteLine("{0}> {1}", linePrefix, files2[i2]);
i2++;
difference = true;
}
else
{
string tempFile1 = Path.GetTempFileName();
string tempFile2 = Path.GetTempFileName();
cabFiles1[i1].CopyTo(tempFile1, true);
cabFiles2[i2].CopyTo(tempFile2, true);
IDiffEngine diffEngine = diffFactory.GetDiffEngine(tempFile1, tempFile2, options);
StringWriter sw = new StringWriter();
if(diffEngine.GetDiff(tempFile1, tempFile2, options, sw, linePrefix + " ", diffFactory))
{
diffOutput.WriteLine("{0}{1}", linePrefix, files1[i1]);
diffOutput.Write(sw.ToString());
difference = true;
}
File.SetAttributes(tempFile1, File.GetAttributes(tempFile1) & ~FileAttributes.ReadOnly);
File.SetAttributes(tempFile2, File.GetAttributes(tempFile2) & ~FileAttributes.ReadOnly);
try
{
File.Delete(tempFile1);
File.Delete(tempFile2);
}
catch(IOException)
{
#if DEBUG
Console.WriteLine("Could not delete temporary files {0} and {1}", tempFile1, tempFile2);
#endif
}
i1++;
i2++;
}
}
return difference;
}
public virtual IDiffEngine Clone()
{
return new CabDiffEngine();
}
}
}
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