I need some ASP C# code fixed. Potentially seconds of work if you know the answer.

I am trying to dynamically create huge zip files.

I get an error at "zo.Finish();" when the user tries to download zip files that are larger than 4.8GB. I need this code fixed so it can create ZIP files of potentially 100GB+. I cant buffer the downloadable file as it needs to start the download immediately.

I have tried running IIS as 64 bit but this has not resolved it.

The code I have is:

string path = @"C:\temp";

Response.Clear();
Response.ContentType = "application/zip";
Response.AddHeader("Content-Disposition", string.Format("attachment; filename=\"{0}\"", "hive.zip"));
Response.BufferOutput = false;

byte[] buffer = new byte[1024 * 1024];
using (ZipOutputStream zo = new ZipOutputStream(Response.OutputStream, 1024 * 1024))
{
zo.SetLevel(0);
zo.UseZip64 = ICSharpCode.SharpZipLib.Zip.UseZip64.On;
DirectoryInfo di = new DirectoryInfo(path);
foreach (string file in Directory.GetFiles(di.FullName, "*.*", SearchOption.AllDirectories))
{
string folder = Path.GetDirectoryName(file);
if (folder.Length > di.FullName.Length)
{
folder = folder.Substring(di.FullName.Length).Trim('\\') + @"\";
}
else
{
folder = string.Empty;
}
zo.PutNextEntry(new ZipEntry(folder + Path.GetFileName(file)));
//zo.UseZip64 = ICSharpCode.SharpZipLib.Zip.UseZip64.On;
using (FileStream fs = System.IO.File.OpenRead(file))
{
ICSharpCode.SharpZipLib.Core.StreamUtils.Copy(fs, zo, buffer);
}
//zo.CloseEntry();
zo.Flush();
Response.Flush();
}
zo.Finish(); // <---- THIS IS WHERE THE ERROR IS

//zo.IsStreamOwner = false;
//zo.Finish();
//zo.Close();
}

Response.Flush();