diff --git a/src/ID3v2.php b/src/ID3v2.php
index 47525f8..1483007 100644
--- a/src/ID3v2.php
+++ b/src/ID3v2.php
@@ -59,26 +59,6 @@ require_once("ID3/Frame.php");
  * need not be known to the software that encounters them. Each frame has an
  * unique and predefined identifier which allows software to skip unknown
  * frames.
- *
- * Overall tag structure:
- *
- * <pre>
- *   +-----------------------------+
- *   |      Header (10 bytes)      |
- *   +-----------------------------+
- *   |       Extended Header       |
- *   | (variable length, OPTIONAL) |
- *   +-----------------------------+
- *   |   Frames (variable length)  |
- *   +-----------------------------+
- *   |           Padding           |
- *   | (variable length, OPTIONAL) |
- *   +-----------------------------+
- *   | Footer (10 bytes, OPTIONAL) |
- *   +-----------------------------+
- * </pre>
- * 
- * In general, padding and footer are mutually exclusive.
  * 
  * @package    php-reader
  * @subpackage ID3
@@ -105,7 +85,7 @@ final class ID3v2
   private $_frames = array();
   
   /** @var string */
-  private $_filename;
+  private $_filename = false;
   
   /** @var Array */
   private $_options;
@@ -118,11 +98,15 @@ final class ID3v2
    *   o version -- The ID3v2 tag version to use in write operation. This option
    *     is automatically set when a tag is read from a file and defaults to 
    *     version 4.0 for tag write.
+   *   o readonly -- Indicates that the tag is read from a temporary file or
+   *     another source it cannot be written back to. The tag can, however,
+   *     still be written to another file.
    *
    * @todo  Only limited subset of flags are processed.
    * @todo  Utilize the SEEK frame and search for a footer to find the tag
    * @todo  Utilize the LINK frame to fetch frames from other sources
-   * @param string $filename The path to the file.
+   * @param string $filename The path to the file, file descriptor of an opened
+   *                         file, or {@link Reader} instance.
    * @param Array  $options  The options array.
    */
   public function __construct($filename = false, $options = array())
@@ -133,11 +117,17 @@ final class ID3v2
     }
     
     $this->_options = &$options;
-    if (($this->_filename = $filename) === false ||
-        file_exists($filename) === false) {
+    if ($filename === false ||
+        (is_string($filename) && file_exists($filename) === false) ||
+        (is_resource($filename) && get_resource_type($filename) != "file")) {
       $this->_header = new ID3_Header(null, $options);
     } else {
-      $this->_reader = new Reader($filename);
+      if (is_string($filename) && !isset($options["readonly"]))
+        $this->_filename = $filename;
+      if ($filename instanceof Reader)
+        $this->_reader = $filename;
+      else
+        $this->_reader = new Reader($filename);
       if ($this->_reader->readString8(3) != "ID3")
         throw new ID3_Exception
           ("File does not contain ID3v2 tag: " . $filename);
@@ -246,10 +236,7 @@ final class ID3v2
    * 
    * @return Array
    */
-  public function getFrames()
-  {
-    return $this->_frames;
-  }
+  public function getFrames() { return $this->_frames; }
   
   /**
    * Returns an array of frames matching the given identifier or an empty array
diff --git a/src/ISO14496/Box/ID32.php b/src/ISO14496/Box/ID32.php
new file mode 100644
index 0000000..8693752
--- /dev/null
+++ b/src/ISO14496/Box/ID32.php
@@ -0,0 +1,93 @@
+<?php
+/**
+ * PHP Reader Library
+ *
+ * Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  - Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *  - Neither the name of the project workgroup nor the names of its
+ *    contributors may be used to endorse or promote products derived from this
+ *    software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @package    php-reader
+ * @subpackage ISO 14496
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Id$
+ */
+
+/**#@+ @ignore */
+require_once("ISO14496/Box/Full.php");
+/**#@-*/
+
+/**
+ * The <i>ID3v2 Box</i> resides under the {@link ISO14496_Box_META Meta Box} and
+ * stores ID3 version 2 meta-data. There may be more than one ID3v2 Box present
+ * each with a different language code.
+ *
+ * @package    php-reader
+ * @subpackage ISO 14496
+ * @author     Sven Vollbehr <svollbehr@gmail.com>
+ * @copyright  Copyright (c) 2008 The PHP Reader Project Workgroup
+ * @license    http://code.google.com/p/php-reader/wiki/License New BSD License
+ * @version    $Rev$
+ */
+final class ISO14496_Box_ID32 extends ISO14496_Box_Full
+{
+  /** @var string */
+  private $_language;
+  
+  /** @var ID3v2 */
+  private $_tag;
+  
+  /**
+   * Constructs the class with given parameters and reads box related data from
+   * the ISO Base Media file.
+   *
+   * @param Reader $reader The reader object.
+   */
+  public function __construct($reader)
+  {
+    parent::__construct($reader);
+    
+    $this->_language =
+      chr(((($tmp = $this->_reader->readUInt16BE()) >> 10) & 0x1f) + 0x60) .
+      chr((($tmp >> 5) & 0x1f) + 0x60) . chr(($tmp & 0x1f) + 0x60);
+    $this->_tag = new ID3v2($this->_reader, array("readonly" => true));
+  }
+  
+  /**
+   * Returns the three byte language code to describe the language of this
+   * media, according to {@link http://www.loc.gov/standards/iso639-2/
+   * ISO 639-2/T}.
+   * 
+   * @return string
+   */
+  public function getLanguage() { return $this->_language; }
+  
+  /**
+   * Returns the {@link ID3v2} tag class instance.
+   *
+   * @return string
+   */
+  public function getTag() { return $this->_tag; }
+}
diff --git a/src/Reader.php b/src/Reader.php
index 70e277b..fc51c29 100644
--- a/src/Reader.php
+++ b/src/Reader.php
@@ -68,7 +68,9 @@ class Reader
    */
   public function __construct($filename, $mode = "rb")
   {
-    if (($this->_fd = fopen($filename, $mode)) === false)
+    if (is_resource($filename) && get_resource_type($filename) == "file")
+      $this->_fd = $filename;
+    else if (($this->_fd = fopen($filename, $mode)) === false)
       throw new Reader_Exception("Unable to open file:" . $filename);
     
     fseek($this->_fd, 0, SEEK_END);
@@ -156,10 +158,7 @@ class Reader
    * 
    * @return integer
    */
-  public function getSize()
-  {
-    return $this->_size;
-  }
+  public function getSize() { return $this->_size; }
   
   /**
    * Magic function so that $obj->value will work.