Recursive Extractor is a .NET Standard 2.0/2.1 Library for parsing archive files and disk images, including nested archives and disk images.

Recursive Extractor is available on NuGet as Microsoft.CST.RecursiveExtractor.

• 7zip
• ar
• bzip2
• deb
• gzip
• iso
• rar
• tar
• vhd
• vhdx
• vmdk
• wim
• xzip
• zip

This example will print out the paths of all the files in the archive.

var path = "/Path/To/Your/Archive"
var extractor = new Extractor();
try {
    IEnumerable<FileEntry> results = extractor.ExtractFile(path);
    foreach(var found in results)
    {
        Console.WriteLine(found.FullPath);
    }
}
catch(OverflowException)
{
    // This means Recursive Extractor has detected a Quine or Zip Bomb
}

You can pass a delegate to process only filtered files.

public delegate bool PassFilter(FileEntryInfo fileEntryInfo);

For example, to only get files larger than 1000 bytes:

var path = "/Path/To/Your/Archive"
var extractor = new Extractor();
try {
    IEnumerable<FileEntry> results = extractor.ExtractFile(path, new ExtractorOptions() { Filter = SizeGreaterThan1000 });
    foreach(var found in results)
    {
        Console.WriteLine(found.FullPath);
    }
}
catch(OverflowException)
{
    // This means Recursive Extractor has detected a Quine or Zip Bomb
}

private bool SizeGreaterThan1000(FileEntryInfo fei)
{
    return fei.Size > 1000;
}

The FileEntryInfo object has these fields:

public string Name { get; }
public string ParentPath { get; }
public long Size { get; }

ExtractFile will throw an overflow exception when a quine or zip bomb is detected.

Otherwise, invalid files found while crawling will emit a logger message and be skipped. RecursiveExtractor uses NLog for logging.

If you have any issues or feature requests please open a new Issue

This project welcomes contributions and suggestions. Most contributions require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to, and actually do, grant us the rights to use your contribution. For details, visit https://cla.opensource.microsoft.com.

When you submit a pull request, a CLA bot will automatically determine whether you need to provide a CLA and decorate the PR appropriately (e.g., status check, comment). Simply follow the instructions provided by the bot. You will only need to do this once across all repos using our CLA.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact opencode@microsoft.com with any additional questions or comments.