Issue using ICSharpCode.SharpZipLib to get zipped file contents of a file within the Citrix enviroment

// Add a .NET reference to vjslib to the project. 
 
// Source:
//  http://www.c-sharpcorner.com/UploadFile/neo_matrix/SharpZip04242007001341AM/SharpZip.aspx
 
using java.io;
using java.util;
using java.util.zip;
using System;
using System.IO;
using System.Collections.Generic;
 
public class PkZip
{
 
    /// <summary> 
    /// Create a zip file from a list of files. 
    /// </summary> 
    /// <param name="zipFileName">Output zip file name.</param> 
    /// <param name="sourceFiles">List of file names to include.</param> 
    public static void Zip(string zipFileName, List<string> sourceFiles)
    {
        // Create an output zip file. 
        FileOutputStream filOpStrm = new FileOutputStream(zipFileName, false);
        ZipOutputStream zipOpStrm = new ZipOutputStream(filOpStrm);
 
        // Add the files by reading from the input file, and writing through the 
        // Zip compression routines. 
        foreach (string strFilName in sourceFiles)
        {
            FileInputStream filIpStrm = new FileInputStream(strFilName);
            ZipEntry ze = new ZipEntry(Path.GetFileName(strFilName));
 
            zipOpStrm.putNextEntry(ze);
 
            sbyte[] buffer = new sbyte[1024];
 
            int len = 0;
 
            // Continue to write the buffer until the end of the data. 
            while (len >= 0)
            {
                len = filIpStrm.read(buffer);
                if (len >= 0)
                    zipOpStrm.write(buffer, 0, len);
            }
 
            filIpStrm.close();
        }
 
        // Close the streams. 
        zipOpStrm.closeEntry();
        zipOpStrm.close();
        filOpStrm.close();
    }
 
 
    /// <summary> 
    /// Extract the files from a zip file to a destination folder. 
    /// </summary> 
    /// <param name="zipFileName">The name of the zip file</param> 
    /// <param name="destinationPath">The destination folder for the extracted files.</param> 
    public static void Unzip(string zipFileName, string destinationPath)
    {
        ZipFile zipfile = new ZipFile(zipFileName);
        List<ZipEntry> zipFileList = GetZipFiles(zipfile);
 
        foreach (ZipEntry file in zipFileList)
        {
            if (!file.isDirectory())
            {
                InputStream s = zipfile.getInputStream(file);
                try
                {
                    string fileName = file.getName();
                    string directoryName = Path.Combine(destinationPath, Path.GetDirectoryName(fileName));
 
                    if (!Directory.Exists(directoryName))
                        Directory.CreateDirectory(directoryName);
 
                    string outputName = Path.Combine(directoryName, Path.GetFileName(fileName));
                    FileOutputStream dest = new FileOutputStream(outputName);
                    try
                    {
                        int len = 0;
                        sbyte[] buffer = new sbyte[7168];
                        while (len >= 0)
                        {
                            len = s.read(buffer);
                            if (len >= 0)
                            {
                                dest.write(buffer, 0, len);
                            }
                        }
                    }
                    finally
                    {
                        dest.close();
                    }
                }
                finally
                {
 
                    s.close();
                }
            }
        }
    }
 
    private static List<ZipEntry> GetZipFiles(ZipFile zipfil)
    {
        List<ZipEntry> lstZip = new List<ZipEntry>();
        Enumeration zipEnum = zipfil.entries();
        while (zipEnum.hasMoreElements())
        {
            ZipEntry zip = (ZipEntry)zipEnum.nextElement();
            lstZip.Add(zip);
        }
 
        return lstZip;
    }
 
}

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