Initial revision

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@102074 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 170 insertions, 0 deletions

diff --git a/libjava/classpath/gnu/java/net/protocol/jar/Connection.java b/libjava/classpath/gnu/java/net/protocol/jar/Connection.java
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+++ b/libjava/classpath/gnu/java/net/protocol/jar/Connection.java
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+/* Connection - jar url connection for java.net
+   Copyright (C) 1999, 2002, 2003, 2005 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.net.protocol.jar;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.JarURLConnection;
+import java.net.MalformedURLException;
+import java.net.ProtocolException;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.Hashtable;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.zip.ZipFile;
+
+/**
+ * This subclass of java.net.JarURLConnection models a URLConnection via
+ * the "jar" protocol.
+ *
+ * @author Kresten Krab Thorup (krab@gnu.org)
+ */
+public final class Connection extends JarURLConnection
+{
+  private JarFile jar_file;
+  private JarEntry jar_entry;
+  private URL jar_url;
+  
+  public static class JarFileCache
+  {
+    private static Hashtable cache = new Hashtable();
+    private static final int READBUFSIZE = 4*1024;
+    
+    public static synchronized JarFile get (URL url) throws IOException
+    {
+      JarFile jf = (JarFile) cache.get (url);
+
+      if (jf != null)
+        return jf;
+      
+      if ("file".equals (url.getProtocol()))
+	{
+	  File f = new File (url.getFile());
+	  jf = new JarFile (f, true, ZipFile.OPEN_READ);
+	}
+      else
+	{
+	  URLConnection urlconn = url.openConnection();
+	  InputStream is = urlconn.getInputStream();
+	  byte[] buf = new byte [READBUFSIZE];
+	  File f = File.createTempFile ("cache", "jar");
+	  FileOutputStream fos = new FileOutputStream (f); 
+	  int len = 0;
+	  
+	  while ((len = is.read (buf)) != -1)
+	    {
+	      fos.write (buf, 0, len);
+	    }
+	  
+	  fos.close();
+	  // Always verify the Manifest, open read only and delete when done.
+	  jf = new JarFile (f, true,
+			    ZipFile.OPEN_READ | ZipFile.OPEN_DELETE);
+	}
+          
+      cache.put (url, jf);
+      
+      return jf;
+    }
+  }
+
+  protected Connection(URL url)
+    throws MalformedURLException
+  {
+    super(url);
+  }
+
+  public synchronized void connect() throws IOException
+  {
+    // Call is ignored if already connected.
+    if (connected)
+      return;
+
+    jar_url = getJarFileURL();
+    jar_file = JarFileCache.get (jar_url);
+    String entry_name = getEntryName();
+    
+    if (entry_name != null
+        && !entry_name.equals (""))
+      {
+        jar_entry = (JarEntry) jar_file.getEntry (entry_name);
+
+        if(jar_entry == null)
+          throw new IOException ("No entry for " + entry_name + " exists.");
+      }
+
+    connected = true;
+  }
+
+  public InputStream getInputStream() throws IOException
+  {
+    if (!connected)
+      connect();
+
+    if (! doInput)
+      throw new ProtocolException("Can't open InputStream if doInput is false");
+    
+    if (jar_entry == null)
+      throw new IOException (jar_url + " couldn't be found.");
+    
+    return jar_file.getInputStream (jar_entry);
+  }
+
+  public synchronized JarFile getJarFile() throws IOException
+  {
+    if (!connected)
+      connect();
+
+    if (! doInput)
+      throw new ProtocolException("Can't open JarFile if doInput is false");
+
+    return jar_file;
+  }
+
+  public int getContentLength()
+  {
+    if (!connected)
+      return -1;
+
+    return (int) jar_entry.getSize();
+  }
+}