--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/org/eclipse/jetty/util/resource/JarResource.java	Wed Sep 07 21:15:48 2016 -0600
@@ -0,0 +1,273 @@
+//
+//  ========================================================================
+//  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+//  ------------------------------------------------------------------------
+//  All rights reserved. This program and the accompanying materials
+//  are made available under the terms of the Eclipse Public License v1.0
+//  and Apache License v2.0 which accompanies this distribution.
+//
+//      The Eclipse Public License is available at
+//      http://www.eclipse.org/legal/epl-v10.html
+//
+//      The Apache License v2.0 is available at
+//      http://www.opensource.org/licenses/apache2.0.php
+//
+//  You may elect to redistribute this code under either of these licenses.
+//  ========================================================================
+//
+
+package org.eclipse.jetty.util.resource;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.JarURLConnection;
+import java.net.URL;
+import java.util.jar.JarEntry;
+import java.util.jar.JarInputStream;
+import java.util.jar.Manifest;
+
+import org.eclipse.jetty.util.IO;
+import org.eclipse.jetty.util.URIUtil;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+
+/* ------------------------------------------------------------ */
+public class JarResource extends URLResource
+{
+    private static final Logger LOG = Log.getLogger(JarResource.class);
+    protected JarURLConnection _jarConnection;
+    
+    /* -------------------------------------------------------- */
+    JarResource(URL url)
+    {
+        super(url,null);
+    }
+
+    /* ------------------------------------------------------------ */
+    JarResource(URL url, boolean useCaches)
+    {
+        super(url, null, useCaches);
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public synchronized void release()
+    {
+        _jarConnection=null;
+        super.release();
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    protected synchronized boolean checkConnection()
+    {
+        super.checkConnection();
+        try
+        {
+            if (_jarConnection!=_connection)
+                newConnection();
+        }
+        catch(IOException e)
+        {
+            LOG.ignore(e);
+            _jarConnection=null;
+        }
+        
+        return _jarConnection!=null;
+    }
+
+    /* ------------------------------------------------------------ */
+    /**
+     * @throws IOException Sub-classes of <code>JarResource</code> may throw an IOException (or subclass) 
+     */
+    protected void newConnection() throws IOException
+    {
+        _jarConnection=(JarURLConnection)_connection;
+    }
+    
+    /* ------------------------------------------------------------ */
+    /**
+     * Returns true if the respresenetd resource exists.
+     */
+    @Override
+    public boolean exists()
+    {
+        if (_urlString.endsWith("!/"))
+            return checkConnection();
+        else
+            return super.exists();
+    }    
+
+    /* ------------------------------------------------------------ */
+    @Override
+    public File getFile()
+        throws IOException
+    {
+        return null;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public InputStream getInputStream()
+        throws java.io.IOException
+    {     
+        checkConnection();
+        if (!_urlString.endsWith("!/"))
+            return new FilterInputStream(super.getInputStream()) 
+            {
+                @Override
+                public void close() throws IOException {this.in=IO.getClosedStream();}
+            };
+
+        URL url = new URL(_urlString.substring(4,_urlString.length()-2));      
+        InputStream is = url.openStream();
+        return is;
+    }
+    
+    /* ------------------------------------------------------------ */
+    @Override
+    public void copyTo(File directory)
+        throws IOException
+    {
+        if (!exists())
+            return;
+        
+        if(LOG.isDebugEnabled())
+            LOG.debug("Extract "+this+" to "+directory);
+        
+        String urlString = this.getURL().toExternalForm().trim();
+        int endOfJarUrl = urlString.indexOf("!/");
+        int startOfJarUrl = (endOfJarUrl >= 0?4:0);
+        
+        if (endOfJarUrl < 0)
+            throw new IOException("Not a valid jar url: "+urlString);
+        
+        URL jarFileURL = new URL(urlString.substring(startOfJarUrl, endOfJarUrl));
+        String subEntryName = (endOfJarUrl+2 < urlString.length() ? urlString.substring(endOfJarUrl + 2) : null);
+        boolean subEntryIsDir = (subEntryName != null && subEntryName.endsWith("/")?true:false);
+      
+        if (LOG.isDebugEnabled()) 
+            LOG.debug("Extracting entry = "+subEntryName+" from jar "+jarFileURL);
+        
+        InputStream is = jarFileURL.openConnection().getInputStream();
+        JarInputStream jin = new JarInputStream(is);
+        JarEntry entry;
+        boolean shouldExtract;
+        while((entry=jin.getNextJarEntry())!=null)
+        {
+            String entryName = entry.getName();
+            if ((subEntryName != null) && (entryName.startsWith(subEntryName)))
+            { 
+                // is the subentry really a dir?
+                if (!subEntryIsDir && subEntryName.length()+1==entryName.length() && entryName.endsWith("/"))
+                        subEntryIsDir=true;
+                
+                //if there is a particular subEntry that we are looking for, only
+                //extract it.
+                if (subEntryIsDir)
+                {
+                    //if it is a subdirectory we are looking for, then we
+                    //are looking to extract its contents into the target
+                    //directory. Remove the name of the subdirectory so
+                    //that we don't wind up creating it too.
+                    entryName = entryName.substring(subEntryName.length());
+                    if (!entryName.equals(""))
+                    {
+                        //the entry is 
+                        shouldExtract = true;                   
+                    }
+                    else
+                        shouldExtract = false;
+                }
+                else
+                    shouldExtract = true;
+            }
+            else if ((subEntryName != null) && (!entryName.startsWith(subEntryName)))
+            {
+                //there is a particular entry we are looking for, and this one
+                //isn't it
+                shouldExtract = false;
+            }
+            else
+            {
+                //we are extracting everything
+                shouldExtract =  true;
+            }
+                
+            
+            if (!shouldExtract)
+            {
+                if (LOG.isDebugEnabled()) 
+                    LOG.debug("Skipping entry: "+entryName);
+                continue;
+            }
+                
+            String dotCheck = entryName.replace('\\', '/');   
+            dotCheck = URIUtil.canonicalPath(dotCheck);
+            if (dotCheck == null)
+            {
+                if (LOG.isDebugEnabled()) 
+                    LOG.debug("Invalid entry: "+entryName);
+                continue;
+            }
+
+            File file=new File(directory,entryName);
+     
+            if (entry.isDirectory())
+            {
+                // Make directory
+                if (!file.exists())
+                    file.mkdirs();
+            }
+            else
+            {
+                // make directory (some jars don't list dirs)
+                File dir = new File(file.getParent());
+                if (!dir.exists())
+                    dir.mkdirs();
+
+                // Make file
+                FileOutputStream fout = null;
+                try
+                {
+                    fout = new FileOutputStream(file);
+                    IO.copy(jin,fout);
+                }
+                finally
+                {
+                    IO.close(fout);
+                }
+
+                // touch the file.
+                if (entry.getTime()>=0)
+                    file.setLastModified(entry.getTime());
+            }
+        }
+        
+        if ((subEntryName == null) || (subEntryName != null && subEntryName.equalsIgnoreCase("META-INF/MANIFEST.MF")))
+        {
+            Manifest manifest = jin.getManifest();
+            if (manifest != null)
+            {
+                File metaInf = new File (directory, "META-INF");
+                metaInf.mkdir();
+                File f = new File(metaInf, "MANIFEST.MF");
+                FileOutputStream fout = new FileOutputStream(f);
+                manifest.write(fout);
+                fout.close();   
+            }
+        }
+        IO.close(jin);
+    }   
+    
+    public static Resource newJarResource(Resource resource) throws IOException
+    {
+        if (resource instanceof JarResource)
+            return resource;
+        return Resource.newResource("jar:" + resource + "!/");
+    }
+}