CODEWITHSUNDEEP
c#.netcompression
Al Katawazi
Al Katawazi

Reputation: 7240

Decompressing Large Gzip File not working using System.IO.Compression

I have a 3.2GB gzip file that I need decompressed but the output of using my code only produces a 64KB file which is not right. 

using (FileStream originalFileStream = fileToDecompress.OpenRead())
{
    string currentFileName = fileToDecompress.FullName;
    string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length);

    using (FileStream decompressedFileStream = File.Create(newFileName))
    {
        using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
        {
            decompressionStream.CopyTo(decompressedFileStream);
            Console.WriteLine("Decompressed: {0}", fileToDecompress.Name);
        }
    }
}

I am using .NET 4.5 and the CopyTo method which I understand should work with files larger than 4GB but am having no luck. Any help would be appreciated.

Upvotes: 0

Views: 795

Answers (2)

Mark Adler
Mark Adler

Reputation: 112512

I highly recommend that you use DotNetZip's interface to zlib instead of NET 4.5's. NET 4.5 has bugs in that interface that Microsoft has declared that they won't fix (!).

Update:

This answer from 2016 is out of date. DotNetZip has been deprecated, where it is recommended to transition to System.IO.Compression.

Upvotes: 3

Al Katawazi
Al Katawazi

Reputation: 7240

I found a solution but it involved making some code changes to open source unzip project for .NET. Essentially the problem crops up when you have multiple gzip streams and they file is too large. Inside the code an int is being used instead of a long and it is resulting in the behavior I was experiencing. Once the code was modified it worked as expected.

Upvotes: 0

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