1 files changed, 145 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/FileURLLoader.java b/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/FileURLLoader.java
new file mode 100644
index 000000000..39d33a4e4
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+++ b/gcc-4.4.3/libjava/classpath/gnu/java/net/loader/FileURLLoader.java
@@ -0,0 +1,145 @@
+/* FileURLLoader.java -- a URLLoader for file URLs
+   Copyright (C) 2006 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.loader;
+
+
+import java.io.File;
+import java.io.IOException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.net.URLStreamHandlerFactory;
+import java.util.StringTokenizer;
+
+/**
+ * A <code>FileURLLoader</code> is a type of <code>URLLoader</code>
+ * only loading from file url.
+ */
+public final class FileURLLoader extends URLLoader
+{
+  File dir; //the file for this file url
+
+  public FileURLLoader(URLClassLoader classloader,
+                       URLStreamHandlerCache cache,
+                       URLStreamHandlerFactory factory,
+                       URL url, URL absoluteUrl)
+  {
+    super(classloader, cache, factory, url, absoluteUrl);
+    dir = new File(absoluteUrl.getFile());
+  }
+
+  /** get resource with the name "name" in the file url */
+  public Resource getResource(String name)
+  {
+    try 
+      {
+        // Make sure that all components in name are valid by walking through
+        // them
+        File file = walkPathComponents(name);
+
+        if (file == null)
+          return null;
+
+        return new FileResource(this, file);
+      }
+    catch (IOException e)
+      {
+        // Fall through...
+      }
+    return null;
+  }
+
+  /**
+   * Walk all path tokens and check them for validity. At no moment, we are
+   * allowed to reach a directory located "above" the root directory, stored
+   * in "dir" property. We are also not allowed to enter a non existing
+   * directory or a non directory component (plain file, symbolic link, ...).
+   * An empty or null path is valid. Pathnames components are separated by
+   * <code>File.separatorChar</code>
+   * 
+   * @param resourceFileName the name to be checked for validity.
+   * @return the canonical file pointed by the resourceFileName or null if the
+   *         walking failed
+   * @throws IOException in case of issue when creating the canonical
+   *           resulting file
+   * @see File#separatorChar
+   */
+  private File walkPathComponents(String resourceFileName) throws IOException
+  {
+    StringTokenizer stringTokenizer = new StringTokenizer(resourceFileName, File.separator);
+    File currentFile = dir;
+    int tokenCount = stringTokenizer.countTokens();
+
+    for (int i = 0; i < tokenCount - 1; i++)
+      {
+        String currentToken = stringTokenizer.nextToken();
+        
+        // If we are at the root directory and trying to go up, the walking is
+        // finished with an error
+        if ("..".equals(currentToken) && currentFile.equals(dir))
+          return null;
+        
+        currentFile = new File(currentFile, currentToken);
+
+        // If the current file doesn't exist or is not a directory, the walking is
+        // finished with an error
+        if (! (currentFile.exists() && currentFile.isDirectory()))
+          return null;
+        
+      }
+    
+    // Treat the last token differently, if it exists, because it does not need
+    // to be a directory
+    if (tokenCount > 0)
+      {
+        String currentToken = stringTokenizer.nextToken();
+        
+        if ("..".equals(currentToken) && currentFile.equals(dir))
+          return null;
+        
+        currentFile = new File(currentFile, currentToken);
+
+        // If the current file doesn't exist, the walking is
+        // finished with an error
+        if (! currentFile.exists())
+          return null;
+    }
+    
+    return currentFile.getCanonicalFile();
+  }
+}
+\ No newline at end of file