Via Darren Neimke 

The other day I posted about a free .NET library for creating zip files on the fly:

     http://weblogs.asp.net/dneimke/archive/2005/02/23/378781.aspx

Here's a little method that I wrote which wraps the functionality of the ICSharpCode library to easily package one or more files into a zip file.

 

private static void WriteZipFile( string[] filesToZip, string writeToFilePath ) {

 try {

   if ( EnsureDirectory(writeToFilePath) ) {

     Crc32 crc = new Crc32();

     ZipOutputStream s = new ZipOutputStream(File.Create(writeToFilePath));

     s.SetLevel(9); // 0 - store only to 9 - means best compression

     for( int i=0; i<filesToZip.Length; i++ ) {

       // Must use a relative path here so that files show up in the Windows Zip File Viewer

       // .. hence the use of Path.GetFileName(...)

       ZipEntry entry = new ZipEntry(Path.GetFileName(filesToZip[i]));

       entry.DateTime = DateTime.Now;

       // Read in the 

       using(FileStream fs = File.OpenRead(filesToZip[i])) {

         byte[] buffer = new byte[fs.Length];

         fs.Read(buffer, 0, buffer.Length);

         // set Size and the crc, because the information

         // about the size and crc should be stored in the header

         // if it is not set it is automatically written in the footer.

         // (in this case size == crc == -1 in the header)

         // Some ZIP programs have problems with zip files that don't store

         // the size and crc in the header.

         entry.Size = fs.Length;

         fs.Close();

         crc.Reset();

         crc.Update(buffer);

         entry.Crc  = crc.Value;

         s.PutNextEntry(entry);

         s.Write(buffer, 0, buffer.Length);

       }

     }

     s.Finish();

     s.Close();

   }

 } 

 catch( Exception ex ) {

   HttpContext.Current.Trace.Warn( ex.ToString() ) ;

 }

}