Not able to compress large file more than 10 GB using DotNetZIP

Question

I am able to compress up to 1 GB of the folder but I have to compress more than 10 GB.

 string filePath  = C:\Work; // path of the source file 
 private void compressFile(string filePath)
 {
     using (ZipFile zip = new ZipFile())
     {                    
        zip.AddDirectory(Path.Combine(filePath, "Demo"));
        if (File.Exists(Path.Combine(filePath, "Demo.zip")))
        {
           File.Delete(Path.Combine(filePath, "Demo.zip"));
           zip.CompressionLevel = Ionic.Zlib.CompressionLevel.BestCompression;                
           zip.Save(Path.Combine(filePath, "Demo.zip"));                        
         }   

         zip.Save(Path.Combine(filePath, "Demo.zip"));               
       }      
    }

I got This Exception... Unable to compressIonic.Zip.ZipException: Compressed or Uncompressed size, or offset exceeds the maximum value. Consider setting the UseZip64WhenSaving property on the ZipFile instance. at Ionic.Zip.ZipEntry.SetZip64Flags() at Ionic.Zip.ZipEntry.PostProcessOutput(Stream s) at Ionic.Zip.ZipEntry._WriteEntryData(Stream s) at Ionic.Zip.ZipEntry.Write(Stream s) at Ionic.Zip.ZipFile.Save() — Dutt93, Jun 21 '17 at 10:00
@stuartd zip64 extends that to 16 billion gigabytes; the first thing to try, then, is *exactly what the exception message says*; however, I'd still be very worried about the amount of data to buffer in memory — Marc Gravell, Jun 21 '17 at 10:04
@stuartd I have 15 GB of a folder which is having only text files, after zipping it will become nearly 2GB. — Dutt93, Jun 21 '17 at 10:05
It may _end up_ at that size, but the error message is clearly telling you that something along the way is exceeding the maximum. — stuartd, Jun 21 '17 at 10:08
[This question](https://stackoverflow.com/questions/14901652/net-ionic-zip-module-killing-drive-space) is related — stuartd, Jun 21 '17 at 10:08

score 6 · Answer 1 · answered Jun 21 '17 at 09:55

I'm assuming the issue here is out-of-memory due to the fact that everything is in memory until the zip.Save call.

Suggestion: don't use DotNetZIP. If you use System.IO.Compression.ZipArchive instead, you start by giving it an output stream (in the constructor). Make that a FileStream and you should be set, without it needing to buffer everything in memory first.

You would need to use ZipArchiveMode.Create

Not able to compress large file more than 10 GB using DotNetZIP

1 Answers1