Loading resources from a ZIP file from a server

I found various bits and pieces regarding this on blogs and Unity Answers posts. The code below is what I pieced together.

With this, I was able to download a ZIP file, save it to the Documents folder on the iPhone and then unzip the two files that were in the test.zip file. Obviously this is not an example of a good way to setup your code, but it shows you how the pieces work to download and unzip the files.

 using UnityEngine;
 using System;
 using System.Text;
 using System.Collections;
 using System.IO;
 using ICSharpCode.SharpZipLib.Zip;
 
 public class ZipTest : MonoBehaviour {
 
     private WWW www;
     private bool isUnzipped = false;
 
     // Use this for initialization
     void Start () {
         string url = "http://www.yoursite.com/files/test.zip";
         www = new WWW(url);
     }
 
     // Update is called once per frame
     void Update () {
         if (www.isDone && !isUnzipped)
         {
             Debug.Log("Load of test.zip complete");
             byte[] data = www.bytes;
 
             string docPath = Application.dataPath;
             docPath = docPath.Substring(0, docPath.Length - 5);
             docPath = docPath.Substring(0, docPath.LastIndexOf("/"));
             docPath += "/Documents/test.zip";
             Debug.Log("docPath=" + docPath);
             System.IO.File.WriteAllBytes(docPath, data);
     
             using (ZipInputStream s = new ZipInputStream(File.OpenRead(docPath)))
             {
                 ZipEntry theEntry;
                 while ((theEntry = s.GetNextEntry()) != null)
                 {
                     Console.WriteLine(theEntry.Name);
                     
                     string directoryName = Path.GetDirectoryName(theEntry.Name);
                     string fileName      = Path.GetFileName(theEntry.Name);
                     
                     // create directory
                     if ( directoryName.Length > 0 )
                     {
                         Directory.CreateDirectory(directoryName);
                     }
 
                     if (fileName != String.Empty)
                     {
                         string filename = docPath.Substring(0, docPath.Length - 8);
                         filename += theEntry.Name;
                         Debug.Log("Unzipping: " + filename);
                         using (FileStream streamWriter = File.Create(filename))
                         {
                             int size = 2048;
                             byte[] fdata = new byte[2048];
                             while (true)
                             {
                                 size = s.Read(fdata, 0, fdata.Length);
                                 if (size > 0)
                                 {
                                     streamWriter.Write(fdata, 0, size);
                                 }
                                 else
                                 {
                                     break;
                                 }
                             }
                         }
                     }
                 }
                 isUnzipped = true;
             }
         }
     }
 }

I just created an empty Unity project and added a Cube to the scene and attached ZipTest.cs (the file that contains the above code) to the Cube object.

Also, note that the path manipulation done here is for iOS only. You will need to create different file paths for other platforms.

Here is the website: SharpZipLib Site

And here is the download link for the source code to include in your project: SharpZipLib Source Code Download

I removed the source folders for BZip2, GZip, Lzw and Tar since I didn't need those. This will make the code a bit smaller. It may be possible to remove other files too such as Encryption, depending on your needs.