1 files changed, 301 insertions, 0 deletions
diff --git a/libjava/java/net/JarURLConnection.java b/libjava/java/net/JarURLConnection.java
new file mode 100644
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+++ b/libjava/java/net/JarURLConnection.java
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+/* Copyright (C) 1999  Cygnus Solutions
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+package java.net;
+
+import java.net.*;
+import java.io.*;
+import java.util.jar.*;
+import java.util.zip.*;
+import java.util.Vector;
+import java.util.Hashtable;
+
+/**
+ * @author Kresten Krab Thorup <krab@gnu.org>
+ * @date Aug 10, 1999.
+ */
+
+
+public abstract class JarURLConnection extends URLConnection
+{
+  // three different ways to say the same thing
+  private final URL jarFileURL;
+
+  /** The connection to the jar file itself. A JarURLConnection
+   *  can represent an entry in a jar file or an entire jar file.  In
+   *  either case this describes just the jar file itself. */
+  protected URLConnection jarFileURLConnection;
+
+  // If this is a connection to a jar file element this is set, otherwose null.
+  private final String element;
+
+  // Cached JarURLConnection's 
+  static Hashtable conn_cache = new Hashtable();
+
+  public URL getJarFileURL ()
+  {
+    return jarFileURL;
+  }
+
+  public String getEntryName ()
+  {
+    return element;
+  }
+
+  public JarURLConnection(URL url)
+    throws MalformedURLException
+  {
+    super(url);
+
+    String spec = url.getFile();
+    int bang = spec.indexOf ("!/", 0);
+    if (bang == -1)
+      throw new MalformedURLException (url + ": No `!/' in spec.");
+
+    // Extact the url for the jar itself.
+    jarFileURL = new URL(spec.substring (0, bang));
+
+    // Get the name of the element, if any.
+    element = (bang+2==spec.length() ? null : spec.substring (bang+2));
+  }
+
+  public synchronized void connect() throws IOException
+  {
+    // Call is ignored if already connected.
+    if (connected)
+      return;
+
+    if (getUseCaches())
+      {
+	jarFileURLConnection = (URLConnection) conn_cache.get (jarFileURL);
+
+	if (jarFileURLConnection == null)
+	  {
+	    jarFileURLConnection = jarFileURL.openConnection ();
+	    jarFileURLConnection.setUseCaches (true);
+	    jarFileURLConnection.connect ();
+	    conn_cache.put (jarFileURL, jarFileURLConnection);
+	  }
+      }
+    else
+      {
+	jarFileURLConnection = jarFileURL.openConnection ();
+	jarFileURLConnection.connect ();
+      }
+
+    connected = true;
+  }
+
+  public InputStream getInputStream() throws IOException
+  {
+    if (!connected)
+      connect();
+
+    if (! doInput)
+      throw new ProtocolException("Can't open InputStream if doInput is false");
+
+    if (element == null)
+      {
+	// This is a JarURLConnection for the entire jar file.  
+
+	InputStream jar_is = new BufferedInputStream(jarFileURLConnection.getInputStream ());
+	return new JarInputStream(jar_is);
+      }
+
+    // Reaching this point, we're looking for an element of a jar file.
+
+    JarFile jarfile = null;
+
+    try
+      {
+	jarfile = getJarFile ();
+      }
+    catch (java.io.IOException x)
+      {
+	/* ignore */
+      }
+    
+    if (jarfile != null)
+      {
+	// this is the easy way...
+	return jarfile.getInputStream (jarfile.getEntry (element));
+      }
+    else
+      {
+	// If the jar file is not local, ...
+	JarInputStream zis = new JarInputStream(jarFileURLConnection.getInputStream ());
+
+	// This is hideous, we're doing a linear search...
+	for (ZipEntry ent = zis.getNextEntry (); 
+	     ent != null; 
+	     ent = zis.getNextEntry ())
+	  {
+	    if (element.equals (ent.getName ()))
+	      {
+		int size = (int)ent.getSize();
+		byte[] data = new byte[size];
+		zis.read (data, 0, size);
+		return new ByteArrayInputStream (data);
+	      }
+	  }
+      }
+
+    return null;
+  }
+
+  public JarEntry getJarEntry (String name)
+    throws java.io.IOException
+  {
+    JarFile jarfile = null;
+
+    if (! doInput)
+      throw new ProtocolException("Can't open JarEntry if doInput is false");
+
+    try
+      {
+	jarfile = getJarFile ();
+      }
+    catch (java.io.IOException x)
+      {
+	/* ignore */
+      }
+    
+    if (jarfile == null)
+      {
+	JarInputStream zis = new JarInputStream(jarFileURLConnection.getInputStream ());
+
+	// This is hideous, we're doing a linear search for the thing...
+	for (ZipEntry ent = zis.getNextEntry (); 
+	     ent != null; 
+	     ent = zis.getNextEntry ())
+	  {
+	    if (element.equals (ent.getName ()))
+	      {
+		return new JarEntry (ent);
+	      }
+	  }
+      }
+
+    else
+      {
+	return jarfile.getJarEntry (element);
+      }
+
+    return null;
+  }
+
+  public abstract JarFile getJarFile() throws java.io.IOException;
+
+
+  // Steal and borrow from protocol/file/Connection.java
+
+  private Hashtable hdrHash = new Hashtable();
+  private Vector hdrVec = new Vector();
+  private boolean gotHeaders = false;
+
+  // Override default method in URLConnection.
+  public String getHeaderField(String name)
+  {
+    try
+      {
+	getHeaders();
+      }
+    catch (IOException x)
+      {
+	return null;
+      }
+    return (String) hdrHash.get(name.toLowerCase());
+  }
+
+  // Override default method in URLConnection.
+  public String getHeaderField(int n)
+  {
+    try
+      {
+	getHeaders();
+      }
+    catch (IOException x)
+      {
+	return null;
+      }
+    if (n < hdrVec.size())
+      return getField((String) hdrVec.elementAt(n));
+
+    return null;
+  }
+
+  // Override default method in URLConnection.
+  public String getHeaderFieldKey(int n)
+  {
+    try
+      {
+	getHeaders();
+      }
+    catch (IOException x)
+      {
+	return null;
+      }
+    if (n < hdrVec.size())
+      return getKey((String) hdrVec.elementAt(n));
+
+    return null;
+  }
+
+  private String getKey(String str)
+  {
+    if (str == null)
+      return null;
+    int index = str.indexOf(':');
+    if (index >= 0)
+      return str.substring(0, index);
+    else
+      return null;
+  }
+
+  private String getField(String str)
+  {
+    if (str == null)
+      return null;
+    int index = str.indexOf(':');
+    if (index >= 0)
+      return str.substring(index + 1).trim();
+    else
+      return str;
+  }
+
+  private void getHeaders() throws IOException
+  {
+    if (gotHeaders)
+      return;
+    gotHeaders = true;
+
+    connect();
+
+    // Yes, it is overkill to use the hash table and vector here since
+    // we're only putting one header in the file, but in case we need
+    // to add others later and for consistency, we'll implement it this way.
+
+    // Add the only header we know about right now:  Content-length.
+    long len;
+
+    if (element == null)
+      len = jarFileURLConnection.getContentLength ();
+    else
+      len = getJarEntry (element).getSize ();
+
+    String line = "Content-length: " + len;
+    hdrVec.addElement(line);
+
+    // The key will never be null in this scenario since we build up the
+    // headers ourselves.  If we ever rely on getting a header from somewhere
+    // else, then we may have to check if the result of getKey() is null.
+    String key = getKey(line);
+    hdrHash.put(key.toLowerCase(), Long.toString(len));
+  }
+
+}