diff --git a/src/ISO14496.php b/src/ISO14496.php
index c3f7cef..60c9887 100644
--- a/src/ISO14496.php
+++ b/src/ISO14496.php
@@ -76,14 +76,20 @@ require_once("ISO14496/Box.php");
  * be placed in a wide variety of containers, not just the top level.
  *
  * <ul>
- * <li><b>ftyp</b> -- <i>{@link ISO14496_Box_FTYP File Type Box}</i>; file type and compatibility
- * <li>pdin -- <i>{@link ISO14496_Box_PDIN Progressive Download Information Box}</i>
- * <li><b>moov</b> -- <i>{@link ISO14496_Box_MOOV Movie Box}</i>; container for all the metadata
+ * <li><b>ftyp</b> -- <i>{@link ISO14496_Box_FTYP File Type Box}</i>; file type
+ *     and compatibility
+ * <li>pdin -- <i>{@link ISO14496_Box_PDIN Progressive Download Information
+ *     Box}</i>
+ * <li><b>moov</b> -- <i>{@link ISO14496_Box_MOOV Movie Box}</i>; container for
+ *     all the metadata
  *   <ul>
- *   <li><b>mvhd</b> -- <i>{@link ISO14496_Box_MVHD Movie Header Box}</i>; overall declarations
- *   <li><b>trak</b> -- <i>{@link ISO14496_Box_TRAK Track Box}</i>; container for an individual track or stream
+ *   <li><b>mvhd</b> -- <i>{@link ISO14496_Box_MVHD Movie Header Box}</i>;
+ *       overall declarations
+ *   <li><b>trak</b> -- <i>{@link ISO14496_Box_TRAK Track Box}</i>; container
+ *       for an individual track or stream
  *     <ul>
- *     <li><b>tkhd</b> -- <i>{@link ISO14496_Box_TKHD Track Header Box}</i>; overall information about the track
+ *     <li><b>tkhd</b> -- <i>{@link ISO14496_Box_TKHD Track Header Box}</i>;
+ *         overall information about the track
  *     <li>tref -- <i>{@link ISO14496_Box_TREF Track Reference Box}</i>
  *     <li>edts -- <i>{@link ISO14496_Box_EDTS Edit Box}</i>
  *       <ul>
@@ -91,36 +97,57 @@ require_once("ISO14496/Box.php");
  *       </ul>
  *     <li><b>mdia</b> -- <i>{@link ISO14496_Box_MDIA Media Box}</i>
  *       <ul>
- *       <li><b>mdhd</b> -- <i>{@link ISO14496_Box_MDHD Media Header Box}</i>; overall information about the media
- *       <li><b>hdlr</b> -- <i>{@link ISO14496_Box_HDLR Handler Reference Box}</i>; declares the media type
- *       <li><b>minf</b> -- <i>{@link ISO14496_Box_MINF Media Information Box}</i>
+ *       <li><b>mdhd</b> -- <i>{@link ISO14496_Box_MDHD Media Header Box}</i>;
+ *           overall information about the media
+ *       <li><b>hdlr</b> -- <i>{@link ISO14496_Box_HDLR Handler Reference
+ *           Box}</i>; declares the media type
+ *       <li><b>minf</b> -- <i>{@link ISO14496_Box_MINF Media Information
+ *           Box}</i>
  *         <ul>
- *         <li>vmhd -- <i>{@link ISO14496_Box_VMHD Video Media Header Box}</i>; overall information (video track only)
- *         <li>smhd -- <i>{@link ISO14496_Box_SMHD Sound Media Header Box}</i>; overall information (sound track only)
- *         <li>hmhd -- <i>{@link ISO14496_Box_HMHD Hint Media Header Box}</i>; overall information (hint track only)
- *         <li>nmhd -- <i>{@link ISO14496_Box_NMHD Null Media Header Box}</i>; overall information (some tracks only)
- *         <li><b>dinf</b> -- <i>{@link ISO14496_Box_DINF Data Information Box}</i>
+ *         <li>vmhd -- <i>{@link ISO14496_Box_VMHD Video Media Header Box}</i>;
+ *             overall information (video track only)
+ *         <li>smhd -- <i>{@link ISO14496_Box_SMHD Sound Media Header Box}</i>;
+ *             overall information (sound track only)
+ *         <li>hmhd -- <i>{@link ISO14496_Box_HMHD Hint Media Header Box}</i>;
+ *             overall information (hint track only)
+ *         <li>nmhd -- <i>{@link ISO14496_Box_NMHD Null Media Header Box}</i>;
+ *             overall information (some tracks only)
+ *         <li><b>dinf</b> -- <i>{@link ISO14496_Box_DINF Data Information
+ *             Box}</i>
  *           <ul>
- *           <li><b>dref</b> -- <i>{@link ISO14496_Box_DREF Data Reference Box}</i>
+ *           <li><b>dref</b> -- <i>{@link ISO14496_Box_DREF Data Reference
+ *               Box}</i>
  *           </ul>
  *         <li><b>stbl</b> -- <i>{@link ISO14496_Box_STBL Sample Table Box}</i>
  *           <ul>
- *           <li><b>stsd</b> -- <i>{@link ISO14496_Box_STSD Sample Descriptions Box}</i>
- *           <li><b>stts</b> -- <i>{@link ISO14496_Box_STTS Decoding Time To Sample Box}</i>
- *           <li>ctts -- <i>{@link ISO14496_Box_CTTS Composition Time To Sample Box}</i>
- *           <li><b>stsc</b> -- <i>{@link ISO14496_Box_STSC Sample To Chunk Box}</i>
+ *           <li><b>stsd</b> -- <i>{@link ISO14496_Box_STSD Sample Descriptions
+ *               Box}</i>
+ *           <li><b>stts</b> -- <i>{@link ISO14496_Box_STTS Decoding Time To
+ *               Sample Box}</i>
+ *           <li>ctts -- <i>{@link ISO14496_Box_CTTS Composition Time To Sample
+ *               Box}</i>
+ *           <li><b>stsc</b> -- <i>{@link ISO14496_Box_STSC Sample To Chunk
+ *               Box}</i>
  *           <li>stsz -- <i>{@link ISO14496_Box_STSZ Sample Size Box}</i>
- *           <li>stz2 -- <i>{@link ISO14496_Box_STZ2 Compact Sample Size Box}</i>
- *           <li><b>stco</b> -- <i>{@link ISO14496_Box_STCO Chunk Offset Box}</i>; 32-bit
- *           <li>co64 -- <i>{@link ISO14496_Box_CO64 Chunk Ooffset Box}</i>; 64-bit
+ *           <li>stz2 -- <i>{@link ISO14496_Box_STZ2 Compact Sample Size
+ *               Box}</i>
+ *           <li><b>stco</b> -- <i>{@link ISO14496_Box_STCO Chunk Offset
+ *               Box}</i>; 32-bit
+ *           <li>co64 -- <i>{@link ISO14496_Box_CO64 Chunk Ooffset Box}</i>;
+ *               64-bit
  *           <li>stss -- <i>{@link ISO14496_Box_STSS Sync Sample Table Box}</i>
- *           <li>stsh -- <i>{@link ISO14496_Box_STSH Shadow Sync Sample Table Box}</i>
+ *           <li>stsh -- <i>{@link ISO14496_Box_STSH Shadow Sync Sample Table
+ *               Box}</i>
  *           <li>padb -- <i>{@link ISO14496_Box_PADB Padding Bits Box}</i>
- *           <li>stdp -- <i>{@link ISO14496_Box_STDP Sample Degradation Priority Box}</i>
- *           <li>sdtp -- <i>{@link ISO14496_Box_SDTP Independent and Disposable Samples Box}</i>
+ *           <li>stdp -- <i>{@link ISO14496_Box_STDP Sample Degradation Priority
+ *               Box}</i>
+ *           <li>sdtp -- <i>{@link ISO14496_Box_SDTP Independent and Disposable
+ *               Samples Box}</i>
  *           <li>sbgp -- <i>{@link ISO14496_Box_SBGP Sample To Group Box}</i>
- *           <li>sgpd -- <i>{@link ISO14496_Box_SGPD Sample Group Description}</i>
- *           <li>subs -- <i>{@link ISO14496_Box_SUBS Sub-Sample Information Box}</i>
+ *           <li>sgpd -- <i>{@link ISO14496_Box_SGPD Sample Group
+ *               Description}</i>
+ *           <li>subs -- <i>{@link ISO14496_Box_SUBS Sub-Sample Information
+ *               Box}</i>
  *           </ul>
  *         </ul>
  *       </ul>
@@ -134,20 +161,25 @@ require_once("ISO14496/Box.php");
  *   </ul>
  * <li>moof -- <i>{@link ISO14496_Box_MOOF Movie Fragment Box}</i>
  *   <ul>
- *   <li><b>mfhd</b> -- <i>{@link ISO14496_Box_MFHD Movie Fragment Header Box}</i>
+ *   <li><b>mfhd</b> -- <i>{@link ISO14496_Box_MFHD Movie Fragment Header
+ *       Box}</i>
  *   <li>traf -- <i>{@link ISO14496_Box_TRAF Track Fragment Box}</i>
  *     <ul>
- *     <li><b>tfhd</b> -- <i>{@link ISO14496_Box_TFHD Track Fragment Header Box}</i>
+ *     <li><b>tfhd</b> -- <i>{@link ISO14496_Box_TFHD Track Fragment Header
+ *         Box}</i>
  *     <li>trun -- <i>{@link ISO14496_Box_TRUN Track Fragment Run}</i>
- *     <li>sdtp -- <i>{@link ISO14496_Box_SDTP Independent and Disposable Samples}</i>
+ *     <li>sdtp -- <i>{@link ISO14496_Box_SDTP Independent and Disposable
+ *         Samples}</i>
  *     <li>sbgp -- <i>{@link ISO14496_Box_SBGP SampleToGroup Box}</i>
  *     <li>subs -- <i>{@link ISO14496_Box_SUBS Sub-Sample Information Box}</i>
  *     </ul>
  *   </ul>
  * <li>mfra -- <i>{@link ISO14496_Box_MFRA Movie Fragment Random Access Box}</i>
  *   <ul>
- *   <li>tfra -- <i>{@link ISO14496_Box_TFRA Track Fragment Random Access Box}</i>
- *   <li><b>mfro</b> -- <i>{@link ISO14496_Box_MFRO Movie Fragment Random Access Offset Box}</i>
+ *   <li>tfra -- <i>{@link ISO14496_Box_TFRA Track Fragment Random Access
+ *       Box}</i>
+ *   <li><b>mfro</b> -- <i>{@link ISO14496_Box_MFRO Movie Fragment Random Access
+ *       Offset Box}</i>
  *   </ul>
  * <li>mdat -- <i>{@link ISO14496_Box_MDAT Media Data Box}</i>
  * <li>free -- <i>{@link ISO14496_Box_FREE Free Space Box}</i>
@@ -160,16 +192,19 @@ require_once("ISO14496/Box.php");
  *   </ul>
  * <li>meta -- <i>{@link ISO14496_Box_META The Meta Box}</i>
  *   <ul>
- *   <li><b>hdlr</b> -- <i>{@link ISO14496_Box_HDLR Handler Reference Box}</i>; declares the metadata type
+ *   <li><b>hdlr</b> -- <i>{@link ISO14496_Box_HDLR Handler Reference Box}</i>;
+ *       declares the metadata type
  *   <li>dinf -- <i>{@link ISO14496_Box_DINF Data Information Box}</i>
  *     <ul>
- *     <li>dref -- <i>{@link ISO14496_Box_DREF Data Reference Box}</i>; declares source(s) of metadata items
+ *     <li>dref -- <i>{@link ISO14496_Box_DREF Data Reference Box}</i>; declares
+ *         source(s) of metadata items
  *     </ul>
  *   <li>ipmc -- <i>{@link ISO14496_Box_IPMC IPMP Control Box}</i>
  *   <li>iloc -- <i>{@link ISO14496_Box_ILOC Item Location Box}</i>
  *   <li>ipro -- <i>{@link ISO14496_Box_IPRO Item Protection Box}</i>
  *     <ul>
- *     <li>sinf -- <i>{@link ISO14496_Box_SINF Protection Scheme Information Box}</i>
+ *     <li>sinf -- <i>{@link ISO14496_Box_SINF Protection Scheme Information
+ *         Box}</i>
  *       <ul>
  *       <li>frma -- <i>{@link ISO14496_Box_FRMA Original Format Box}</i>
  *       <li>imif -- <i>{@link ISO14496_Box_IMIF IPMP Information Box}</i>
@@ -192,11 +227,13 @@ require_once("ISO14496/Box.php");
  * moov.udta.meta.
  *
  * <ul>
- * <li><i>moov</i> -- <i>{@link ISO14496_Box_MOOV Movie Box}</i>; container for all the metadata
+ * <li><i>moov</i> -- <i>{@link ISO14496_Box_MOOV Movie Box}</i>; container for
+ *     all the metadata
  * <li><i>udta</i> -- <i>{@link ISO14496_Box_UDTA User Data Box}</i>
  * <li><i>meta</i> -- <i>{@link ISO14496_Box_META The Meta Box}</i>
  *   <ul>
- *   <li>ilst -- <i>{@link ISO14496_Box_ILST The iTunes/iPod Tag Container Box}</i>
+ *   <li>ilst -- <i>{@link ISO14496_Box_ILST The iTunes/iPod Tag Container
+ *       Box}</i>
  *   <li>id32 -- <i>{@link ISO14496_Box_ID32 The ID3v2 Box}</i>
  *   </ul>
  * </ul>
@@ -210,19 +247,134 @@ require_once("ISO14496/Box.php");
  */
 class ISO14496 extends ISO14496_Box
 {
+  /** @var string */
+  private $_filename;
+  
   /**
-   * Constructs the ISO14496 class with given file.
+   * Constructs the ISO14496 class with given file and options.
+   *
+   * The following options are currently recognized:
+   *   o base -- Indicates that only boxes with the given base path are parsed
+   *     from the ISO base media file. Parsing all boxes can possibly have a
+   *     significant impact on running time. Base path is a list of nested boxes
+   *     separated by a dot.
+   *   o readonly -- Indicates that the file is read from a temporary location
+   *     or another source it cannot be written back to. The use of base option
+   *     implies readonly option.
    *
    * @param string $filename The path to the file or file descriptor of an
    *                         opened file.
+   * @param Array  $options  The options array.
    */
-  public function __construct($filename)
+  public function __construct($filename, $options = array())
   {
-    $this->_reader = new Reader($filename);
-    $this->_offset = 0;
-    $this->_size = $this->_reader->getSize();
-    $this->_type = "file";
-    $this->_container = true;
+    $this->_reader = new Reader($this->_filename = $filename);
+    if (isset($options["base"]))
+      $options["readonly"] = true;
+    $this->setOptions($options);
+    $this->setOffset(0);
+    $this->setSize($this->_reader->getSize());
+    $this->setType("file");
+    $this->setContainer(true);
     $this->constructBoxes();
   }
+  
+  /**
+   * Writes the changes back to the original media file.
+   *
+   * Please note: currently the method writes only ID32 and ILST boxes to
+   * <i>moov.udta.meta</i>. Changes to any other box are discarded. Write
+   * operation will overwrite <i>moov.udta</i>, if found.
+   */
+  public function write()
+  {
+    if (!isset($this->moov->udta->meta->ilst) &&
+        !isset($this->moov->udta->meta->id32))
+      throw new ISO14496_Exception("Nothing to write");
+
+    if ($this->getOption("readonly", false) !== false)
+      throw new ISO14496_Exception("File is read only");
+    
+    if (($fd = fopen($this->_filename, file_exists
+                     ($this->_filename) ? "r+b" : "wb")) === false)
+      throw new ISO14496_Exception
+        ("Unable to open file for writing: " . $filename);
+    
+    $this->moov->udta->meta->hdlr->setHandlerType("mdir");
+    
+    /* Calculate start position */
+    $mark = ($this->moov->udta->getOffset() > 0 ?
+             $this->moov->udta->getOffset() :
+             $this->moov->getOffset() + $this->moov->getSize());
+    
+    /* Calculate file size */
+    fseek($fd, 0, SEEK_END);
+    $oldFileSize = ftell($fd);
+    $newFileSize = $oldFileSize -
+      ($this->moov->udta->getOffset() > 0 ? $this->moov->udta->getSize() : 0) -
+      (isset($this->moov->udta->meta->free) ?
+       $this->moov->udta->meta->free->getSize() : 0) +
+      strlen($this->moov->udta);
+
+    /* Calculate free space size */
+    if ($oldFileSize < $newFileSize) {
+      // Add free space to the file calculated using the following logaritmic
+      // equation: log(0.2(x + 10)), ranging from 1k to 9k given the file size
+      // of 0..4G
+      $this->moov->udta->meta->free->setSize
+        (ceil(log(0.2 * ($newFileSize / 1024 + 10), 10) * 1024));
+      ftruncate($fd, $newFileSize += $this->moov->udta->meta->free->getSize());
+      
+      // Move data to the end of the file
+      for ($i = 1, $cur = $oldFileSize; $cur > $mark; $cur -= 1024, $i++) {
+        fseek($fd, -(($i * 1024) +
+              ($excess = $cur - 1024 > $mark ? 0 : $cur - $mark - 1024) +
+              ($newFileSize - $oldFileSize)), SEEK_END);
+        $buffer = fread($fd, 1024);
+        fseek($fd, -(($i * 1024) + $excess), SEEK_END);
+        fwrite($fd, $buffer, 1024);
+      }
+      
+      // Update stco/co64 to correspond the data move
+      foreach ($this->moov->getBoxesByIdentifier("trak") as $trak) {
+        $chunkOffsetBox = 
+          (isset($trak->mdia->minf->stbl->stco) ?
+           $trak->mdia->minf->stbl->stco : $trak->mdia->minf->stbl->co64);
+        $chunkOffsetTable = $chunkOffsetBox->getChunkOffsetTable();
+        $chunkOffsetTableCount = count($chunkOffsetTable);
+        $chunkOffsetDelta = $newFileSize - $oldFileSize;
+        for ($i = 1; $i <= $chunkOffsetTableCount; $i++)
+          $chunkOffsetTable[$i] += $chunkOffsetDelta;
+        $chunkOffsetBox->setChunkOffsetTable($chunkOffsetTable);
+        fseek($fd, $chunkOffsetBox->getOffset());
+        fwrite($fd, $chunkOffsetBox, $chunkOffsetBox->getSize());
+      }
+    } 
+    else
+      $this->moov->udta->meta->free->setSize($oldFileSize - $newFileSize);
+    
+    /* Update the target box */
+    fseek($fd, $mark);
+    $this->moov->udta->setSize(fwrite($fd, $this->moov->udta));
+    
+    /* Update the parent box */
+    fseek($fd, $this->moov->getOffset());
+    fwrite($fd, Transform::toUInt32BE($this->moov->getSize()));
+    
+    fclose($fd);
+  }
+  
+  /**
+   * Returns the raw data of the ISO14496 file.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    if ($this->isContainer())
+      foreach ($this->getBoxes() as $name => $boxes)
+        foreach ($boxes as $box)
+          $data .= $box;
+    return $data;
+  }
 }
diff --git a/src/ISO14496/Box.php b/src/ISO14496/Box.php
index a2071ba..a1afffe 100644
--- a/src/ISO14496/Box.php
+++ b/src/ISO14496/Box.php
@@ -58,64 +58,164 @@ class ISO14496_Box
    */
   protected $_reader;
   
-  /**
-   * The file offset to box start.
-   *
-   * @var integer
-   */
-  protected $_offset;
+  /** @var Array */
+  private $_options;
   
-  /**
-   * The object size in bytes, including the size and type header, fields, and
-   * all contained boxes.
-   *
-   * @var integer
-   */
-  protected $_size;
+  /** @var integer */
+  private $_offset = -1;
+  
+  /** @var integer */
+  private $_size = -1;
   
   /** @var string */
-  protected $_type;
+  private $_type;
+  
+  
+  /** @var ISO14496_Box */
+  private $_parent = null;
   
   
   /** @var boolean */
-  protected $_container = false;
-  
-  /**
-   * An array of boxes the box contains.
-   *
-   * @var Array
-   */
-  protected $_boxes = array();
+  private $_container = false;
   
+  /** @var Array */
+  private $_boxes = array();
+
+  /** @var Array */
+  private static $_path = array();
   
   /**
    * Constructs the class with given parameters.
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    $this->_reader = $reader;
-    $this->_offset = $this->_reader->getOffset();
-    $this->_size = $this->_reader->readUInt32BE();
-    $this->_type = $this->_reader->read(4);
+    if (($this->_reader = $reader) === null) {
+      $this->_type = strtolower(substr(get_class($this), -4));
+    } else {
+      $this->_offset = $this->_reader->getOffset();
+      $this->_size = $this->_reader->readUInt32BE();
+      $this->_type = $this->_reader->read(4);
     
-    if ($this->_size == 1)
-      $this->_size = $this->_reader->readInt64BE();
-    if ($this->_size == 0)
-      $this->_size = $this->_reader->getSize() - $offset;
+      if ($this->_size == 1)
+        $this->_size = $this->_reader->readInt64BE();
+      if ($this->_size == 0)
+        $this->_size = $this->_reader->getSize() - $this->_offset;
 
-    if ($this->_type == "uuid")
-      $this->_type = $this->_reader->readGUID();
+      if ($this->_type == "uuid")
+        $this->_type = $this->_reader->readGUID();
+    }
+    $this->_options = $options;
   }
   
   /**
-   * Returns the type of the ISO base media file object.
+   * Returns the options array.
+   *
+   * @return Array
+   */
+  public function getOptions() { return $this->_options; }
+
+  /**
+   * Returns the given option value, or the default value if the option is not
+   * defined.
+   *
+   * @param string $option The name of the option.
+   * @param mixed $defaultValue The default value to be returned.
+   */
+  public function getOption($option, $defaultValue = false)
+  {
+    if (isset($this->_options[$option]))
+      return $this->_options[$option];
+    return $defaultValue;
+  }
+  
+  /**
+   * Sets the options array. See {@link ISO14496} class for available options.
+   *
+   * @param Array $options The options array.
+   */
+  public function setOptions(&$options) { $this->_options = $options; }
+  
+  /**
+   * Sets the given option the given value.
+   *
+   * @param string $option The name of the option.
+   * @param mixed $value The value to set for the option.
+   */
+  public function setOption($option, $value)
+  {
+    $this->_options[$option] = $value;
+  }
+  
+  /**
+   * Returns the file offset to box start, or -1 if the box was created on heap.
+   * 
+   * @return integer
+   */
+  public function getOffset() { return $this->_offset; }
+  
+  /**
+   * Sets the file offset where the box starts.
+   * 
+   * @param integer $offset The file offset to box start.
+   */
+  public function setOffset($offset) { $this->_offset = $offset; }
+  
+  /**
+   * Returns the box size in bytes, including the size and type header,
+   * fields, and all contained boxes, or -1 if the box was created on heap.
+   * 
+   * @return integer
+   */
+  public function getSize() { return $this->_size; }
+  
+  /**
+   * Sets the box size. The size must include the size and type header,
+   * fields, and all contained boxes.
+   *
+   * The method will propagate size change to box parents.
+   * 
+   * @todo Size does not propagate to parent
+   * @param integer $size The box size.
+   */
+  public function setSize($size)
+  {
+    if ($this->_parent !== null)
+      $this->_parent->setSize
+        (($this->_parent->getSize() > 0 ? $this->_parent->getSize() : 0) +
+         $size - ($this->_size > 0 ? $this->_size : 0));
+    $this->_size = $size;
+  }
+  
+  /**
+   * Returns the box type.
    * 
    * @return string
    */
   public function getType() { return $this->_type; }
   
+  /**
+   * Sets the box type.
+   * 
+   * @param string $type The box type.
+   */
+  public function setType($type) { $this->_type = $type; }
+  
+  /**
+   * Returns the parent box containing this box.
+   * 
+   * @return ISO14496_Box
+   */
+  public function getParent() { return $this->_parent; }
+  
+  /**
+   * Sets the parent containing box.
+   * 
+   * @param ISO14496_Box $parent The parent box.
+   */
+  public function setParent(&$parent) { $this->_parent = $parent; }
+  
   /**
    * Returns a boolean value corresponding to whether the box is a container.
    * 
@@ -142,35 +242,57 @@ class ISO14496_Box
 
   /**
    * Reads and constructs the boxes found within this box.
+   *
+   * @todo Does not parse iTunes internal ---- boxes.
    */
   protected function constructBoxes($defaultclassname = "ISO14496_Box")
   {
+    $base = $this->getOption("base", "");
+    if ($this->getType() != "file")
+      self::$_path[] = $this->getType();
+    $path = implode(self::$_path, ".");
+    
     while (true) {
       $offset = $this->_reader->getOffset();
       if ($offset >= $this->_offset + $this->_size)
         break;
       $size = $this->_reader->readUInt32BE();
-      $type = $this->_reader->read(4);
+      $type = rtrim($this->_reader->read(4), " ");
       if ($size == 1)
         $size = $this->_reader->readInt64BE();
       if ($size == 0)
         $size = $this->_reader->getSize() - $offset;
-      $this->_reader->setOffset($offset);
-      
-      if (@fopen($filename = "ISO14496/Box/" . strtoupper($type) . ".php",
-                 "r", true) !== false)
-        require_once($filename);
-      if (class_exists($classname = "ISO14496_Box_" . strtoupper($type)))
-        $box = new $classname($this->_reader);
-      else
-        $box = new $defaultclassname($this->_reader);
-      
-      if (!isset($this->_boxes[$type]))
-        $this->_boxes[$type] = array();
-      $this->_boxes[$type][] = $box;
       
+      if (preg_match("/^\xa9?[a-z]{3,4}$/i", $type) &&
+          substr($base, 0, min(strlen($base), strlen
+                               ($tmp = $path . ($path ? "." : "") . $type))) ==
+          substr($tmp,  0, min(strlen($base), strlen($tmp))))
+      {
+        $this->_reader->setOffset($offset);
+        if (@fopen($filename = "ISO14496/Box/" . strtoupper($type) . ".php",
+                   "r", true) !== false)
+          require_once($filename);
+        if (class_exists($classname = "ISO14496_Box_" . strtoupper($type)))
+          $box = new $classname($this->_reader, $this->_options);
+        else
+          $box = new $defaultclassname($this->_reader, $this->_options);
+        $box->setParent($this);
+        if (!isset($this->_boxes[$box->getType()]))
+          $this->_boxes[$box->getType()] = array();
+        $this->_boxes[$box->getType()][] = $box;
+      }
       $this->_reader->setOffset($offset + $size);
     }
+    
+    array_pop(self::$_path);
+  }
+  
+  protected function getPath()
+  {
+    $path = "";
+    echo "box: " .$this->getType() . ", parent: " . $this->getParent()."\n";
+    for ($child = $this; ($parent = $child->getParent()) !== null; $child = $parent){echo "parent found";$path = $parent->getType() . "." . $path;};
+    return $path;
   }
   
   /**
@@ -227,8 +349,23 @@ class ISO14496_Box
     foreach ($this->_boxes as $identifier => $boxes)
       if (preg_match($searchPattern, $identifier))
         foreach ($boxes as $box)
-          $boxes[] = $box;
-    return $boxes;
+          $matches[] = $box;
+    return $matches;
+  }
+  
+  /**
+   * Adds a new box into the current box and returns it.
+   *
+   * @param ISO14496_Box The box to add
+   * @return ISO14496_Box
+   */
+  public function addBox($box)
+  {
+    $box->setParent($this);
+    $box->setOptions($this->_options);
+    if (!$this->hasBox($box->getType()))
+      $this->_boxes[$box->getType()] = array();
+    return $this->_boxes[$box->getType()][] = $box;
   }
   
   /**
@@ -237,7 +374,9 @@ class ISO14496_Box
    * matches the identifier, and if not found, invoke a getter method.
    *
    * If there are no boxes or getter methods with given name, the method
-   * will yield an exception.
+   * attempts to create a frame with given identifier.
+   *
+   * If none of these work, an exception is thrown.
    *
    * @param string $name The box or field name.
    * @return mixed
@@ -248,9 +387,29 @@ class ISO14496_Box
       return $this->_boxes[$name][0];
     if (method_exists($this, "get" . ucfirst($name)))
       return call_user_func(array($this, "get" . ucfirst($name)));
+    if (@fopen($filename = "ISO14496/Box/" .
+               strtoupper($name) . ".php", "r", true) !== false)
+      require_once($filename);
+    if (class_exists($classname = "ISO14496_Box_" . strtoupper($name)))
+      return $this->addBox(new $classname());
     throw new ISO14496_Exception("Unknown box/field: " . $name);
   }
   
+  /**
+   * Magic function so that assignments with $obj->value will work.
+   *
+   * @param string $name  The field name.
+   * @param string $value The field value.
+   * @return mixed
+   */
+  public function __set($name, $value)
+  {
+    if (method_exists($this, "set" . ucfirst($name)))
+      call_user_func
+        (array($this, "set" . ucfirst($name)), $value);
+    else throw new ISO14496_Exception("Unknown field: " . $name);
+  }
+  
   /**
    * Magic function so that isset($obj->value) will work. This method checks
    * whether the box is a container and contains a box that matches the
@@ -263,4 +422,39 @@ class ISO14496_Box
   {
     return ($this->isContainer() && isset($this->_boxes[$name]));
   }
+  
+  /**
+   * Magic function so that unset($obj->value) will work. This method removes
+   * all the boxes from this container that match the identifier.
+   *
+   * @param string $name The box name.
+   */
+  public function __unset($name)
+  {
+    if ($this->isContainer())
+      unset($this->_boxes[$name]);
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    if ($this->isContainer())
+      foreach ($this->getBoxes() as $name => $boxes)
+        foreach ($boxes as $box)
+          $data .= $box;
+    $size = strlen($data) + 8;
+    if ($size > 0xffffffff)
+      $size += 8;
+    if (strlen($this->_type) > 4)
+      $size += 16;
+    return ($size > 0xffffffff ?
+             Transform::toUInt32BE(1) : Transform::toUInt32BE($size)) .
+      (strlen($this->_type) > 4 ? "uuid" : $this->_type) .
+      ($size > 0xffffffff ? Transform::toInt64BE($size) : "") . 
+      (strlen($this->_type) > 4 ? Transform::toGUID($this->_type) : "") . $data;
+  }
 }
diff --git a/src/ISO14496/Box/BXML.php b/src/ISO14496/Box/BXML.php
index fb8e821..3fd5c1c 100644
--- a/src/ISO14496/Box/BXML.php
+++ b/src/ISO14496/Box/BXML.php
@@ -66,12 +66,12 @@ final class ISO14496_Box_BXML extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_data = $this->_reader->read
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
   }
   
   /**
diff --git a/src/ISO14496/Box/CDSC.php b/src/ISO14496/Box/CDSC.php
index 3369235..0effe2b 100644
--- a/src/ISO14496/Box/CDSC.php
+++ b/src/ISO14496/Box/CDSC.php
@@ -61,11 +61,11 @@ final class ISO14496_Box_CDSC extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    while ($this->_reader->getOffset <= $this->_size)
+    while ($this->_reader->getOffset <= $this->getSize())
       $this->_trackId[] = $this->_reader->readUInt32BE();
   }
   
diff --git a/src/ISO14496/Box/CO64.php b/src/ISO14496/Box/CO64.php
index 51f7b80..8aa5c59 100644
--- a/src/ISO14496/Box/CO64.php
+++ b/src/ISO14496/Box/CO64.php
@@ -74,13 +74,16 @@ final class ISO14496_Box_CO64 extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
-      $this->_chunkOffsetTable[$i] = $this->_reader->readInt64BE();
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
+      $this->_chunkOffsetTable[$i] =
+        Transform::fromInt64BE(substr($data, ($i - 1) * 8, 8));
   }
   
   /**
@@ -90,8 +93,30 @@ final class ISO14496_Box_CO64 extends ISO14496_Box_Full
    *
    * @return Array
    */
-  public function getChunkOffsetTable()
+  public function getChunkOffsetTable() { return $this->_chunkOffsetTable; }
+  
+  /**
+   * Sets an array of chunk offsets. Each entry must have the entry number as
+   * its index and a 64 bit integer that gives the offset of the start of a
+   * chunk into its containing media file as its value.
+   *
+   * @param Array $chunkOffsetTable The chunk offset array.
+   */
+  public function setChunkOffsetTable($chunkOffsetTable)
   {
-    return $this->_chunkOffsetTable;
+    $this->_chunkOffsetTable = $chunkOffsetTable;
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    $data = Transform::toUInt32BE(count($this->_chunkOffsetTable));
+    foreach ($this->_chunkOffsetTable as $chunkOffset)
+      $data .= Transform::toInt64BE($chunkOffset);
+    return parent::__toString($data);
   }
 }
diff --git a/src/ISO14496/Box/CPRT.php b/src/ISO14496/Box/CPRT.php
index b8c69f6..be1d9b7 100644
--- a/src/ISO14496/Box/CPRT.php
+++ b/src/ISO14496/Box/CPRT.php
@@ -67,15 +67,15 @@ final class ISO14496_Box_CPRT extends ISO14496_Box_Full
    * @param Reader $reader The reader object.
    * @todo Distinguish UTF-16?
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_language =
       chr(((($tmp = $this->_reader->readUInt16BE()) >> 10) & 0x1f) + 0x60) .
       chr((($tmp >> 5) & 0x1f) + 0x60) . chr(($tmp & 0x1f) + 0x60);
     $this->_notice = $this->_reader->read
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
   }
   
   /**
diff --git a/src/ISO14496/Box/CTTS.php b/src/ISO14496/Box/CTTS.php
index b986a31..ec539a4 100644
--- a/src/ISO14496/Box/CTTS.php
+++ b/src/ISO14496/Box/CTTS.php
@@ -67,15 +67,19 @@ final class ISO14496_Box_CTTS extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
       $this->_compositionOffsetTable[$i] = array
-        ("sampleCount" => $this->_reader->readUInt32BE(),
-         "sampleOffset" => $this->_reader->readUInt32BE());
+        ("sampleCount" =>
+           Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
+         "sampleOffset" =>
+           Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
   }
   
   /**
diff --git a/src/ISO14496/Box/DINF.php b/src/ISO14496/Box/DINF.php
index da969b4..a8dfbbe 100644
--- a/src/ISO14496/Box/DINF.php
+++ b/src/ISO14496/Box/DINF.php
@@ -58,10 +58,14 @@ final class ISO14496_Box_DINF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/DREF.php b/src/ISO14496/Box/DREF.php
index 9e59a2d..ced6db9 100644
--- a/src/ISO14496/Box/DREF.php
+++ b/src/ISO14496/Box/DREF.php
@@ -64,25 +64,25 @@ final class ISO14496_Box_DREF extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
-    $count = $this->_reader->readUInt32BE();
-    for ($i = 0; $i < $count; $i++) {
-      $offset = $this->_reader->getOffset();
-      $size = $this->_reader->readUInt32BE();
-      $type = $this->_reader->read(4);
-      $this->_reader->setOffset($offset);
-      if ($type == "url ") {
-        require_once("ISO14496/Box/URL.php");
-        $this->_boxes[] = new ISO14496_Box_URL($this->_reader);
-      }
-      if ($type == "urn ") {
-        require_once("ISO14496/Box/URN.php");
-        $this->_boxes[] = new ISO14496_Box_URN($this->_reader);
-      }
-      $this->_reader->setOffset($offset + $size);
-    }
+    
+    if ($reader === null)
+      return;
+
+    $this->_reader->skip(4);
+    $this->constructBoxes();
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString(Transform::toUInt32BE(count($this->_boxes)));
   }
 }
diff --git a/src/ISO14496/Box/EDTS.php b/src/ISO14496/Box/EDTS.php
index 322c992..0e24e13 100644
--- a/src/ISO14496/Box/EDTS.php
+++ b/src/ISO14496/Box/EDTS.php
@@ -63,10 +63,14 @@ final class ISO14496_Box_EDTS extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/ELST.php b/src/ISO14496/Box/ELST.php
index bc81fde..e424f2e 100644
--- a/src/ISO14496/Box/ELST.php
+++ b/src/ISO14496/Box/ELST.php
@@ -63,9 +63,9 @@ final class ISO14496_Box_ELST extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
     for ($i = 1; $i <= $entryCount; $i++) {
diff --git a/src/ISO14496/Box/FREE.php b/src/ISO14496/Box/FREE.php
index dcf9607..f239e5f 100644
--- a/src/ISO14496/Box/FREE.php
+++ b/src/ISO14496/Box/FREE.php
@@ -54,4 +54,23 @@ require_once("ISO14496/Box.php");
  */
 final class ISO14496_Box_FREE extends ISO14496_Box
 {
+  /**
+   * Constructs the class with given parameters.
+   *
+   * @param Reader $reader The reader object.
+   */
+  public function __construct($reader = null, &$options = array())
+  {
+    parent::__construct($reader, $options);
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString(str_repeat("\0", $this->getSize() - 8));
+  }
 }
diff --git a/src/ISO14496/Box/FRMA.php b/src/ISO14496/Box/FRMA.php
index 8d6d2cb..bb180e8 100644
--- a/src/ISO14496/Box/FRMA.php
+++ b/src/ISO14496/Box/FRMA.php
@@ -61,9 +61,9 @@ final class ISO14496_Box_FRMA extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_dataFormat = $this->_reader->read(4);
   }
diff --git a/src/ISO14496/Box/FTYP.php b/src/ISO14496/Box/FTYP.php
index 1e40ce3..550e583 100644
--- a/src/ISO14496/Box/FTYP.php
+++ b/src/ISO14496/Box/FTYP.php
@@ -108,13 +108,13 @@ final class ISO14496_Box_FTYP extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_majorBrand   = $this->_reader->readString8(4);
     $this->_minorVersion = $this->_reader->readUInt32BE();
-    while ($this->_reader->getOffset() < $this->_size)
+    while ($this->_reader->getOffset() < $this->getSize())
       if (($brand = $this->_reader->readString8(4)) != "")
         $this->_compatibleBrands[] = $brand;
   }
diff --git a/src/ISO14496/Box/Full.php b/src/ISO14496/Box/Full.php
index 094cfff..06e7ab9 100644
--- a/src/ISO14496/Box/Full.php
+++ b/src/ISO14496/Box/Full.php
@@ -52,10 +52,10 @@ require_once("ISO14496/Box.php");
 abstract class ISO14496_Box_Full extends ISO14496_Box
 {
   /** @var integer */
-  protected $_version;
+  protected $_version = 0;
   
   /** @var integer */
-  protected $_flags;
+  protected $_flags = 0;
   
   /**
    * Constructs the class with given parameters and reads box related data from
@@ -63,10 +63,13 @@ abstract class ISO14496_Box_Full extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
+    if ($reader === null)
+      return;
+
     $this->_version = (($field = $this->_reader->readUInt32BE()) >> 24) & 0xff;
     $this->_flags = $field & 0xffffff;
   }
@@ -78,6 +81,13 @@ abstract class ISO14496_Box_Full extends ISO14496_Box
    */
   public function getVersion() { return $this->_version; }
   
+  /**
+   * Sets the version of this format of the box.
+   * 
+   * @param integer $version The version.
+   */
+  public function setVersion($version) { $this->_version = $version; }
+  
   /**
    * Checks whether or not the flag is set. Returns <var>true</var> if the flag
    * is set, <var>false</var> otherwise.
@@ -93,4 +103,22 @@ abstract class ISO14496_Box_Full extends ISO14496_Box
    * @return integer
    */
   public function getFlags() { return $this->_flags; }
+  
+  /**
+   * Sets the map of flags.
+   * 
+   * @param string $flags The map of flags.
+   */
+  public function setFlags($flags) { $this->_flags = $flags; }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString
+      (Transform::toUInt32BE($this->_version << 24 | $this->_flags) . $data);
+  }
 }
diff --git a/src/ISO14496/Box/HDLR.php b/src/ISO14496/Box/HDLR.php
index 5112481..61b88d3 100644
--- a/src/ISO14496/Box/HDLR.php
+++ b/src/ISO14496/Box/HDLR.php
@@ -69,15 +69,18 @@ final class ISO14496_Box_HDLR extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
+    
+    if ($reader === null)
+      return;
     
     $this->_reader->skip(4);
     $this->_handlerType = $this->_reader->read(4);
     $this->_reader->skip(12);
     $this->_name = $this->_reader->readString8
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
   }
   
   /**
@@ -96,6 +99,25 @@ final class ISO14496_Box_HDLR extends ISO14496_Box_Full
    */
   public function getHandlerType() { return $this->_handlerType; }
   
+  /**
+   * Sets the handler type.
+   * 
+   * When present in a media box, the value must be set to one of the following
+   * values, or a value from a derived specification:
+   *   o <i>vide</i> Video track
+   *   o <i>soun</i> Audio track
+   *   o <i>hint</i> Hint track
+   * 
+   * When present in a meta box, the value must be set to an appropriate value
+   * to indicate the format of the meta box contents.
+   * 
+   * @param string $handlerType The handler type.
+   */
+  public function setHandlerType($handlerType)
+  {
+    $this->_handlerType = $handlerType;
+  }
+  
   /**
    * Returns the name string. The name is in UTF-8 characters and gives a
    * human-readable name for the track type (for debugging and inspection
@@ -104,4 +126,25 @@ final class ISO14496_Box_HDLR extends ISO14496_Box_Full
    * @return integer
    */
   public function getName() { return $this->_name; }
+  
+  /**
+   * Sets the name string. The name must be in UTF-8 and give a human-readable
+   * name for the track type (for debugging and inspection purposes).
+   * 
+   * @param string $name The human-readable description.
+   */
+  public function setName($name) { $this->_name = $name; }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString
+      ("appl" . $this->_handlerType . Transform::toUInt32BE(0) .
+       Transform::toUInt32BE(0) . Transform::toUInt32BE(0) . $this->_name .
+       "\0");
+  }
 }
diff --git a/src/ISO14496/Box/HINT.php b/src/ISO14496/Box/HINT.php
index 365618a..286f3e5 100644
--- a/src/ISO14496/Box/HINT.php
+++ b/src/ISO14496/Box/HINT.php
@@ -62,11 +62,11 @@ final class ISO14496_Box_HINT extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    while ($this->_reader->getOffset <= $this->_size)
+    while ($this->_reader->getOffset <= $this->getSize())
       $this->_trackId[] = $this->_reader->readUInt32BE();
   }
   
diff --git a/src/ISO14496/Box/HMHD.php b/src/ISO14496/Box/HMHD.php
index 49ca254..3c39f2c 100644
--- a/src/ISO14496/Box/HMHD.php
+++ b/src/ISO14496/Box/HMHD.php
@@ -70,9 +70,9 @@ final class ISO14496_Box_HMHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_maxPDUSize = $this->_reader->readUInt16BE();
     $this->_avgPDUSize = $this->_reader->readUInt16BE();
diff --git a/src/ISO14496/Box/ID32.php b/src/ISO14496/Box/ID32.php
index 8693752..7f1c44f 100644
--- a/src/ISO14496/Box/ID32.php
+++ b/src/ISO14496/Box/ID32.php
@@ -54,7 +54,7 @@ require_once("ISO14496/Box/Full.php");
 final class ISO14496_Box_ID32 extends ISO14496_Box_Full
 {
   /** @var string */
-  private $_language;
+  private $_language = "und";
   
   /** @var ID3v2 */
   private $_tag;
@@ -65,9 +65,12 @@ final class ISO14496_Box_ID32 extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
+    
+    if ($reader === null)
+      return;
     
     $this->_language =
       chr(((($tmp = $this->_reader->readUInt16BE()) >> 10) & 0x1f) + 0x60) .
@@ -84,10 +87,45 @@ final class ISO14496_Box_ID32 extends ISO14496_Box_Full
    */
   public function getLanguage() { return $this->_language; }
   
+  /**
+   * Sets the three byte language code as specified in the
+   * {@link http://www.loc.gov/standards/iso639-2/ ISO 639-2} standard.
+   * 
+   * @param string $language The language code.
+   */
+  public function setLanguage($language) { $this->_language = $language; }
+  
   /**
    * Returns the {@link ID3v2} tag class instance.
    *
    * @return string
    */
   public function getTag() { return $this->_tag; }
+  
+  /**
+   * Sets the {@link ID3v2} tag class instance using given language.
+   *
+   * @param ID3v2 $tag The tag instance.
+   * @param string $language The language code.
+   */
+  public function setTag($tag, $language = false)
+  {
+    $this->_tag = $tag;
+    if ($language !== false)
+      $this->_language = $language;
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString
+      (Transform::toUInt16BE
+       (((ord($language[0]) - 0x60) << 10) |
+        ((ord($language[1]) - 0x60) << 5) |
+          ord($language[2]) - 0x60) . $this->_tag);
+  }
 }
diff --git a/src/ISO14496/Box/IINF.php b/src/ISO14496/Box/IINF.php
index 1f96b4d..a45270b 100644
--- a/src/ISO14496/Box/IINF.php
+++ b/src/ISO14496/Box/IINF.php
@@ -63,11 +63,25 @@ final class ISO14496_Box_IINF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
-    $this->_reader->skip(2);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+
+    $this->_reader->skip(2);
     $this->constructBoxes();
   }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString(Transform::toUInt16BE(count($this->_boxes)));
+  }
 }
diff --git a/src/ISO14496/Box/ILOC.php b/src/ISO14496/Box/ILOC.php
index 62d9dbe..315e7e9 100644
--- a/src/ISO14496/Box/ILOC.php
+++ b/src/ISO14496/Box/ILOC.php
@@ -94,9 +94,9 @@ final class ISO14496_Box_ILOC extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $offsetSize = (($tmp = $this->_reader->readUInt32BE()) >> 28) & 0xf;
     $lengthSize = ($tmp >> 24) & 0xf;
diff --git a/src/ISO14496/Box/ILST.php b/src/ISO14496/Box/ILST.php
index 2ea62dd..22c5de9 100644
--- a/src/ISO14496/Box/ILST.php
+++ b/src/ISO14496/Box/ILST.php
@@ -52,20 +52,44 @@ require_once("ISO14496/Box.php");
  */
 final class ISO14496_Box_ILST extends ISO14496_Box
 {
-  private $_data = array();
-  
   /**
    * 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)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes("ISO14496_Box_ILST_Container");
   }
+  
+  /**
+   * Override magic function so that $obj->value on a box will return the data
+   * box instead of the data container box.
+   *
+   * @param string $name The box or field name.
+   * @return mixed
+   */
+  public function __get($name)
+  {
+    if (strlen($name) == 3)
+      $name = "\xa9" . $name;
+    if ($name[0] == "_")
+      $name = "\xa9" . substr($name, 1, 3);
+    if ($this->hasBox($name)) {
+      $boxes = $this->getBoxesByIdentifier($name);
+      return $boxes[0]->data;
+    }
+    if (method_exists($this, "get" . ucfirst($name)))
+      return call_user_func(array($this, "get" . ucfirst($name)));
+    return $this->addBox(new ISO14496_Box_ILST_Container($name))->data;
+  }
 }
 
 /**
@@ -82,11 +106,16 @@ final class ISO14496_Box_ILST extends ISO14496_Box
  */
 final class ISO14496_Box_ILST_Container extends ISO14496_Box
 {
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct(is_string($reader) ? null : $reader, $options);
     $this->setContainer(true);
-    $this->constructBoxes();
+    
+    if (is_string($reader)) {
+      $this->setType($reader);
+      $this->addBox(new ISO14496_Box_DATA());
+    } else
+      $this->constructBoxes();
   }
 }
 
@@ -134,18 +163,21 @@ final class ISO14496_Box_DATA extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
+    
+    if ($reader === null)
+      return;
     
     $this->_reader->skip(4);
     $data = $this->_reader->read
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
     switch ($this->getFlags()) {
     case self::INTEGER:
     case self::INTEGER_OLD_STYLE:
       for ($i = 0;  $i < strlen($data); $i++)
-        $this->_value .= ord($data[$i]);
+        $this->_value .= Transform::fromInt8($data[$i]);
       break;
     case self::STRING:
     default:
@@ -159,4 +191,61 @@ final class ISO14496_Box_DATA extends ISO14496_Box_Full
    * @return mixed
    */
   public function getValue() { return $this->_value; }
+  
+  /**
+   * Sets the value this box contains.
+   * 
+   * @return mixed
+   */
+  public function setValue($value, $type = false)
+  {
+    $this->_value = (string)$value;
+    if ($type === false && is_string($value))
+      $this->_flags = self::STRING;
+    if ($type === false && is_int($value))
+      $this->_flags = self::INTEGER;
+    if ($type !== false)
+      $this->_flags = $type;
+  }
+  
+  /**
+   * Override magic function so that $obj->data will return the current box
+   * instead of an error. For other values the method will attempt to call a
+   * getter method.
+   *
+   * If there are no getter methods with given name, the method will yield an
+   * exception.
+   *
+   * @param string $name The box or field name.
+   * @return mixed
+   */
+  public function __get($name)
+  {
+    if ($name == "data")
+      return $this;
+    if (method_exists($this, "get" . ucfirst($name)))
+      return call_user_func(array($this, "get" . ucfirst($name)));
+    throw new ISO14496_Exception("Unknown box/field: " . $name);
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    switch ($this->getFlags()) {
+    case self::INTEGER:
+    case self::INTEGER_OLD_STYLE:
+      $data = "";
+      for ($i = 0;  $i < strlen($this->_value); $i++)
+        $data .= Transform::toInt8($this->_value[$i]);
+      break;
+    case self::STRING:
+    default:
+      $data = $this->_value;
+    }
+    return parent::__toString("\0\0\0\0" . $data);
+  }
 }
diff --git a/src/ISO14496/Box/IMIF.php b/src/ISO14496/Box/IMIF.php
index e42a32e..a8fcf8f 100644
--- a/src/ISO14496/Box/IMIF.php
+++ b/src/ISO14496/Box/IMIF.php
@@ -78,10 +78,14 @@ final class ISO14496_Box_IMIF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/INFE.php b/src/ISO14496/Box/INFE.php
index d48d6fa..28740bb 100644
--- a/src/ISO14496/Box/INFE.php
+++ b/src/ISO14496/Box/INFE.php
@@ -72,15 +72,16 @@ final class ISO14496_Box_INFE extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_itemId = $this->_reader->readUInt16BE();
     $this->_itemProtectionIndex = $this->_reader->readUInt16BE();
     list($this->_itemName, $this->_contentType, $this->_contentEncoding) =
-      preg_split("/\\x00/", $this->_reader->read
-                 ($this->_offset + $this->_size - $this->_reader->getOffset()));
+      preg_split
+        ("/\\x00/", $this->_reader->read
+         ($this->getOffset() + $this->getSize() - $this->_reader->getOffset()));
   }
   
   /**
diff --git a/src/ISO14496/Box/IPRO.php b/src/ISO14496/Box/IPRO.php
index 45c4fce..658fd0c 100644
--- a/src/ISO14496/Box/IPRO.php
+++ b/src/ISO14496/Box/IPRO.php
@@ -58,11 +58,25 @@ final class ISO14496_Box_IPRO extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
-    $this->_reader->skip(2);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+
+    $this->_reader->skip(2);
     $this->constructBoxes();
   }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    return parent::__toString(Transform::toUInt16BE(count($this->_boxes)));
+  }
 }
diff --git a/src/ISO14496/Box/MDAT.php b/src/ISO14496/Box/MDAT.php
index a9f66b7..84441c7 100644
--- a/src/ISO14496/Box/MDAT.php
+++ b/src/ISO14496/Box/MDAT.php
@@ -59,8 +59,8 @@ final class ISO14496_Box_MDAT extends ISO14496_Box
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
   }
 }
diff --git a/src/ISO14496/Box/MDHD.php b/src/ISO14496/Box/MDHD.php
index b3c32f3..e0211eb 100644
--- a/src/ISO14496/Box/MDHD.php
+++ b/src/ISO14496/Box/MDHD.php
@@ -73,9 +73,9 @@ final class ISO14496_Box_MDHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     if ($this->getVersion() == 1) {
       $this->_creationTime = $this->_reader->readInt64BE();
diff --git a/src/ISO14496/Box/MDIA.php b/src/ISO14496/Box/MDIA.php
index c06df11..70f399a 100644
--- a/src/ISO14496/Box/MDIA.php
+++ b/src/ISO14496/Box/MDIA.php
@@ -58,10 +58,14 @@ final class ISO14496_Box_MDIA extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MEHD.php b/src/ISO14496/Box/MEHD.php
index 3bdc5cd..8d25d95 100644
--- a/src/ISO14496/Box/MEHD.php
+++ b/src/ISO14496/Box/MEHD.php
@@ -62,9 +62,9 @@ final class ISO14496_Box_MEHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     if ($this->getVersion() == 1)
       $this->_fragmentDuration = $this->_reader->readInt64BE();
diff --git a/src/ISO14496/Box/META.php b/src/ISO14496/Box/META.php
index 60ce1f0..0e7e532 100644
--- a/src/ISO14496/Box/META.php
+++ b/src/ISO14496/Box/META.php
@@ -77,10 +77,14 @@ final class ISO14496_Box_META extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MFHD.php b/src/ISO14496/Box/MFHD.php
index 42199d1..eb64359 100644
--- a/src/ISO14496/Box/MFHD.php
+++ b/src/ISO14496/Box/MFHD.php
@@ -64,9 +64,9 @@ final class ISO14496_Box_MFHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_sequenceNumber = $this->_reader->readUInt32BE();
   }
diff --git a/src/ISO14496/Box/MFRA.php b/src/ISO14496/Box/MFRA.php
index 1d09357..54eb649 100644
--- a/src/ISO14496/Box/MFRA.php
+++ b/src/ISO14496/Box/MFRA.php
@@ -72,10 +72,14 @@ final class ISO14496_Box_MFRA extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MFRO.php b/src/ISO14496/Box/MFRO.php
index d7ec28e..08008e2 100644
--- a/src/ISO14496/Box/MFRO.php
+++ b/src/ISO14496/Box/MFRO.php
@@ -59,7 +59,7 @@ require_once("ISO14496/Box/Full.php");
 final class ISO14496_Box_MFRO extends ISO14496_Box_Full
 {
   /** @var integer */
-  private $_size;
+  private $_parentSize;
 
   /**
    * Constructs the class with given parameters and reads box related data from
@@ -67,11 +67,11 @@ final class ISO14496_Box_MFRO extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    $this->_size = $this->_reader->readUInt32BE();
+    $this->_parentSize = $this->_reader->readUInt32BE();
   }
   
   /**
@@ -81,5 +81,5 @@ final class ISO14496_Box_MFRO extends ISO14496_Box_Full
    * 
    * @return integer
    */
-  public function getSize() { return $this->_size; }
+  public function getParentSize() { return $this->_parentSize; }
 }
diff --git a/src/ISO14496/Box/MINF.php b/src/ISO14496/Box/MINF.php
index 017e621..cf5dd1b 100644
--- a/src/ISO14496/Box/MINF.php
+++ b/src/ISO14496/Box/MINF.php
@@ -58,10 +58,14 @@ final class ISO14496_Box_MINF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MOOF.php b/src/ISO14496/Box/MOOF.php
index 17cc950..55e3c1c 100644
--- a/src/ISO14496/Box/MOOF.php
+++ b/src/ISO14496/Box/MOOF.php
@@ -68,10 +68,14 @@ final class ISO14496_Box_MOOF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MOOV.php b/src/ISO14496/Box/MOOV.php
index 74308c7..208f200 100644
--- a/src/ISO14496/Box/MOOV.php
+++ b/src/ISO14496/Box/MOOV.php
@@ -59,10 +59,14 @@ final class ISO14496_Box_MOOV extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MVEX.php b/src/ISO14496/Box/MVEX.php
index 9dcf7c7..f4d4a4a 100644
--- a/src/ISO14496/Box/MVEX.php
+++ b/src/ISO14496/Box/MVEX.php
@@ -61,10 +61,14 @@ final class ISO14496_Box_MVEX extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/MVHD.php b/src/ISO14496/Box/MVHD.php
index 2ff90dc..dac4288 100644
--- a/src/ISO14496/Box/MVHD.php
+++ b/src/ISO14496/Box/MVHD.php
@@ -80,9 +80,9 @@ final class ISO14496_Box_MVHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     if ($this->getVersion() == 1) {
       $this->_creationTime = $this->_reader->readInt64BE();
diff --git a/src/ISO14496/Box/PDIN.php b/src/ISO14496/Box/PDIN.php
index 0a3af25..5bb3a40 100644
--- a/src/ISO14496/Box/PDIN.php
+++ b/src/ISO14496/Box/PDIN.php
@@ -68,11 +68,11 @@ final class ISO14496_Box_PDIN extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    while ($this->_reader->getOffset() < $this->_offset + $this->_size())
+    while ($this->_reader->getOffset() < $this->getOffset() + $this->getSize())
       $this->_progressiveDownloadInfo[] = array
         ("rate" => $this->_reader->readUInt32BE(),
          "initialDelay" => $this->_reader->readUInt32BE());
diff --git a/src/ISO14496/Box/PITM.php b/src/ISO14496/Box/PITM.php
index b9fed10..465f48d 100644
--- a/src/ISO14496/Box/PITM.php
+++ b/src/ISO14496/Box/PITM.php
@@ -66,9 +66,9 @@ final class ISO14496_Box_PITM extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_itemId = $this->_reader->readUInt16BE();
   }
diff --git a/src/ISO14496/Box/SBGP.php b/src/ISO14496/Box/SBGP.php
index 606dc28..299cccd 100644
--- a/src/ISO14496/Box/SBGP.php
+++ b/src/ISO14496/Box/SBGP.php
@@ -76,16 +76,20 @@ final class ISO14496_Box_SBGP extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $groupingType = $this->_reader->readUInt32BE();
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
       $this->_sampleToGroupTable[$i] = array
-        ("sampleCount" => $this->_reader->readUInt32BE(),
-         "groupDescriptionIndex" => $this->_reader->readUInt32BE());
+        ("sampleCount" =>
+           Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
+         "groupDescriptionIndex" =>
+           Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
   }
   
   /**
diff --git a/src/ISO14496/Box/SCHI.php b/src/ISO14496/Box/SCHI.php
index 19cba02..2e7c43e 100644
--- a/src/ISO14496/Box/SCHI.php
+++ b/src/ISO14496/Box/SCHI.php
@@ -61,10 +61,14 @@ final class ISO14496_Box_SCHI extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/SCHM.php b/src/ISO14496/Box/SCHM.php
index 79934d2..148448b 100644
--- a/src/ISO14496/Box/SCHM.php
+++ b/src/ISO14496/Box/SCHM.php
@@ -66,16 +66,16 @@ final class ISO14496_Box_SCHM extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_schemeType = $this->_reader->read(4);
     $this->_schemeVersion = $this->_reader->readUInt32BE();
     if ($this->hasFlag(1))
       $this->_schemeUri = preg_split
         ("/\\x00/", $this->_reader->read
-         ($this->_offset + $this->_size - $this->_reader->getOffset()));
+         ($this->getOffset() + $this->getSize() - $this->_reader->getOffset()));
   }
   
   /**
diff --git a/src/ISO14496/Box/SDTP.php b/src/ISO14496/Box/SDTP.php
index a16167d..b5b6818 100644
--- a/src/ISO14496/Box/SDTP.php
+++ b/src/ISO14496/Box/SDTP.php
@@ -87,14 +87,17 @@ final class ISO14496_Box_SDTP extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    for ($i = 0; $this->_reader->getOffset() <
-                 $this->_offset + $this->_size; $i++)
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    $dataSize = strlen($data);
+    for ($i = 1; $i <= $dataSize; $i++)
       $this->_sampleDependencyTypeTable[$i] = array
-        ("sampleDependsOn" => (($tmp = $this->_reader->readInt8()) >> 4) & 0x3,
+        ("sampleDependsOn" => (($tmp = Transform::fromInt8
+                                ($data[$i - 1])) >> 4) & 0x3,
          "sampleIsDependedOn" => ($tmp >> 2) & 0x3,
          "sampleHasRedundancy" => $tmp & 0x3);
   }
diff --git a/src/ISO14496/Box/SINF.php b/src/ISO14496/Box/SINF.php
index 947be52..5651b75 100644
--- a/src/ISO14496/Box/SINF.php
+++ b/src/ISO14496/Box/SINF.php
@@ -74,10 +74,14 @@ final class ISO14496_Box_SINF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/SKIP.php b/src/ISO14496/Box/SKIP.php
index be37347..fa8ab98 100644
--- a/src/ISO14496/Box/SKIP.php
+++ b/src/ISO14496/Box/SKIP.php
@@ -60,10 +60,14 @@ final class ISO14496_Box_SKIP extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/SMHD.php b/src/ISO14496/Box/SMHD.php
index d557513..9881452 100644
--- a/src/ISO14496/Box/SMHD.php
+++ b/src/ISO14496/Box/SMHD.php
@@ -59,8 +59,8 @@ final class ISO14496_Box_SMHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
   }
 }
diff --git a/src/ISO14496/Box/STBL.php b/src/ISO14496/Box/STBL.php
index c63fca7..8793f77 100644
--- a/src/ISO14496/Box/STBL.php
+++ b/src/ISO14496/Box/STBL.php
@@ -77,10 +77,14 @@ final class ISO14496_Box_STBL extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/STCO.php b/src/ISO14496/Box/STCO.php
index 66c0d27..de83e94 100644
--- a/src/ISO14496/Box/STCO.php
+++ b/src/ISO14496/Box/STCO.php
@@ -74,13 +74,16 @@ final class ISO14496_Box_STCO extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
-      $this->_chunkOffsetTable[$i] = $this->_reader->readUInt32BE();
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
+      $this->_chunkOffsetTable[$i] =
+        Transform::fromUInt32BE(substr($data, ($i - 1) * 4, 4));
   }
   
   /**
@@ -90,8 +93,30 @@ final class ISO14496_Box_STCO extends ISO14496_Box_Full
    *
    * @return Array
    */
-  public function getChunkOffsetTable()
+  public function getChunkOffsetTable() { return $this->_chunkOffsetTable; }
+  
+  /**
+   * Sets an array of chunk offsets. Each entry must have the entry number as
+   * its index and a 32 bit integer that gives the offset of the start of a
+   * chunk into its containing media file as its value.
+   *
+   * @param Array $chunkOffsetTable The chunk offset array.
+   */
+  public function setChunkOffsetTable($chunkOffsetTable)
   {
-    return $this->_chunkOffsetTable;
+    $this->_chunkOffsetTable = $chunkOffsetTable;
+  }
+  
+  /**
+   * Returns the box raw data.
+   *
+   * @return string
+   */
+  public function __toString($data = "")
+  {
+    $data = Transform::toUInt32BE(count($this->_chunkOffsetTable));
+    foreach ($this->_chunkOffsetTable as $chunkOffset)
+      $data .= Transform::toUInt32BE($chunkOffset);
+    return parent::__toString($data);
   }
 }
diff --git a/src/ISO14496/Box/STDP.php b/src/ISO14496/Box/STDP.php
index b070924..5eb371c 100644
--- a/src/ISO14496/Box/STDP.php
+++ b/src/ISO14496/Box/STDP.php
@@ -62,11 +62,11 @@ final class ISO14496_Box_STDP extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
-    while ($this->_reader->getOffset() < $this->_offset + $this->_size)
+    while ($this->_reader->getOffset() < $this->getOffset() + $this->getSize())
       $this->_values[] = array("priority" => $this->_reader->readUInt16BE());
   }
   
diff --git a/src/ISO14496/Box/STSC.php b/src/ISO14496/Box/STSC.php
index e14a84a..b0fc13e 100644
--- a/src/ISO14496/Box/STSC.php
+++ b/src/ISO14496/Box/STSC.php
@@ -69,16 +69,21 @@ final class ISO14496_Box_STSC extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
       $this->_sampleToChunkTable[$i] = array
-        ("firstChunk" => $this->_reader->readUInt32BE(),
-         "samplesPerChunk" => $this->_reader->readUInt32BE(),
-         "sampleDescriptionIndex" => $this->_reader->readUInt32BE());
+        ("firstChunk" =>
+           Transform::fromUInt32BE(substr($data, ($i - 1) * 12, 4)),
+         "samplesPerChunk" =>
+           Transform::fromUInt32BE(substr($data, $i * 12 - 8, 4)),
+         "sampleDescriptionIndex" =>
+           Transform::fromUInt32BE(substr($data, $i * 12 - 4, 4)));
   }
   
   /**
diff --git a/src/ISO14496/Box/STSH.php b/src/ISO14496/Box/STSH.php
index 1324e64..3990a0e 100644
--- a/src/ISO14496/Box/STSH.php
+++ b/src/ISO14496/Box/STSH.php
@@ -86,15 +86,19 @@ final class ISO14496_Box_STSH extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
     for ($i = 0; $i < $entryCount; $i++)
       $this->_shadowSyncSampleTable[$i] = array
-        ("shadowedSampleNumber" => $this->_reader->readUInt32BE(),
-         "syncSampleNumber" => $this->_reader->readUInt32BE());
+        ("shadowedSampleNumber" =>
+           Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
+         "syncSampleNumber" =>
+           Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
   }
   
   /**
diff --git a/src/ISO14496/Box/STSS.php b/src/ISO14496/Box/STSS.php
index 662e2b5..c5c3285 100644
--- a/src/ISO14496/Box/STSS.php
+++ b/src/ISO14496/Box/STSS.php
@@ -63,13 +63,16 @@ final class ISO14496_Box_STSS extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
-      $this->_syncSampleTable[$i] = $this->_reader->readUInt32BE();
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
+      $this->_syncSampleTable[$i] =
+        Transform::fromUInt32BE(substr($data, ($i - 1) * 4, 4));
   }
   
   /**
diff --git a/src/ISO14496/Box/STSZ.php b/src/ISO14496/Box/STSZ.php
index b827ae2..264900e 100644
--- a/src/ISO14496/Box/STSZ.php
+++ b/src/ISO14496/Box/STSZ.php
@@ -73,15 +73,19 @@ final class ISO14496_Box_STSZ extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_sampleSize = $this->_reader->readUInt32BE();
     $sampleCount = $this->_reader->readUInt32BE();
-    if ($this->_sampleSize == 0)
-      for ($i = 1; $i < $sampleCount; $i++)
-        $this->_sampleSizeTable[$i] = $this->_reader->readUInt32BE();
+    if ($this->_sampleSize == 0) {
+      $data = $this->_reader->read
+        ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+      for ($i = 1; $i <= $sampleCount; $i++)
+        $this->_sampleSizeTable[$i] =
+          Transform::fromUInt32BE(substr($data, ($i - 1) * 4, 4));
+    }
   }
   
   /**
diff --git a/src/ISO14496/Box/STTS.php b/src/ISO14496/Box/STTS.php
index 7d08d8d..446abd4 100644
--- a/src/ISO14496/Box/STTS.php
+++ b/src/ISO14496/Box/STTS.php
@@ -78,15 +78,19 @@ final class ISO14496_Box_STTS extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++)
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $entryCount; $i++)
       $this->_timeToSampleTable[$i] = array
-        ("sampleCount" => $this->_reader->readUInt32BE(),
-         "sampleDelta" => $this->_reader->readUInt32BE());
+        ("sampleCount" =>
+           Transform::fromUInt32BE(substr($data, ($i - 1) * 8, 4)),
+         "sampleDelta" =>
+           Transform::fromUInt32BE(substr($data, $i * 8 - 4, 4)));
   }
   
   /**
diff --git a/src/ISO14496/Box/STZ2.php b/src/ISO14496/Box/STZ2.php
index b7f44f6..fdcdc1b 100644
--- a/src/ISO14496/Box/STZ2.php
+++ b/src/ISO14496/Box/STZ2.php
@@ -68,26 +68,29 @@ final class ISO14496_Box_STZ2 extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_reader->skip(3);
     $fieldSize = $this->_reader->readInt8();
     $sampleCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $sampleCount; $i++) {
+    $data = $this->_reader->read
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
+    for ($i = 1; $i <= $sampleCount; $i++) {
       switch ($fieldSize) {
       case 4:
         $this->_sampleSizeTable[$i] =
-          (($tmp = $this->_reader->readInt8()) >> 4) & 0xf;
+          (($tmp = Transform::fromInt8($data[$i - 1])) >> 4) & 0xf;
         if ($i + 1 < $sampleCount)
           $this->_sampleSizeTable[$i++] = $tmp & 0xf;
         break;
       case 8:
-        $this->_sampleSizeTable[$i] = $this->_reader->readInt8();
+        $this->_sampleSizeTable[$i] = Transform::fromInt8($data[$i - 1]);
         break;
       case 16:
-        $this->_sampleSizeTable[$i] = $this->_reader->readUInt16BE();
+        $this->_sampleSizeTable[$i] =
+          Transform::fromUInt16BE(substr($data, ($i - 1) * 2, 2));
         break;
       }
     }
diff --git a/src/ISO14496/Box/SUBS.php b/src/ISO14496/Box/SUBS.php
index bb53e61..eeda868 100644
--- a/src/ISO14496/Box/SUBS.php
+++ b/src/ISO14496/Box/SUBS.php
@@ -79,9 +79,9 @@ final class ISO14496_Box_SUBS extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $entryCount = $this->_reader->readUInt32BE();
     for ($i = 0; $i < $entryCount; $i++) {
diff --git a/src/ISO14496/Box/TFHD.php b/src/ISO14496/Box/TFHD.php
index b9a93f6..288dece 100644
--- a/src/ISO14496/Box/TFHD.php
+++ b/src/ISO14496/Box/TFHD.php
@@ -111,9 +111,9 @@ final class ISO14496_Box_TFHD extends ISO14496_Box_Full
    * @param Reader  $reader The reader object.
    * @todo The sample flags could be parsed further
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_trackId = $this->_reader->readUInt32BE();
     if ($this->hasFlag(self::BASE_DATA_OFFSET))
diff --git a/src/ISO14496/Box/TFRA.php b/src/ISO14496/Box/TFRA.php
index 70eb42a..177f6df 100644
--- a/src/ISO14496/Box/TFRA.php
+++ b/src/ISO14496/Box/TFRA.php
@@ -73,9 +73,9 @@ final class ISO14496_Box_TFRA extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_trackId = $this->_reader->readUInt32BE();
     
@@ -83,7 +83,7 @@ final class ISO14496_Box_TFRA extends ISO14496_Box_Full
     $trunNumberSize = ($tmp >> 2) & 0x3;
     $sampleNumberSize = $tmp & 0x3;
     $entryCount = $this->_reader->readUInt32BE();
-    for ($i = 1; $i < $entryCount; $i++) {
+    for ($i = 1; $i <= $entryCount; $i++) {
       $entry = array();
       if ($this->getVersion() == 1) {
         $entry["time"] = $this->_reader->readInt64BE();
diff --git a/src/ISO14496/Box/TKHD.php b/src/ISO14496/Box/TKHD.php
index c6a8750..f27e39d 100644
--- a/src/ISO14496/Box/TKHD.php
+++ b/src/ISO14496/Box/TKHD.php
@@ -92,9 +92,9 @@ final class ISO14496_Box_TKHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     if ($this->getVersion() == 1) {
       $this->_creationTime = $this->_reader->readInt64BE();
diff --git a/src/ISO14496/Box/TRAF.php b/src/ISO14496/Box/TRAF.php
index dc1d6b3..69a7bb7 100644
--- a/src/ISO14496/Box/TRAF.php
+++ b/src/ISO14496/Box/TRAF.php
@@ -64,10 +64,14 @@ final class ISO14496_Box_TRAF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/TRAK.php b/src/ISO14496/Box/TRAK.php
index e3ce5d1..8d6110f 100644
--- a/src/ISO14496/Box/TRAK.php
+++ b/src/ISO14496/Box/TRAK.php
@@ -70,10 +70,14 @@ final class ISO14496_Box_TRAK extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/TREF.php b/src/ISO14496/Box/TREF.php
index 5cb654b..33e7f27 100644
--- a/src/ISO14496/Box/TREF.php
+++ b/src/ISO14496/Box/TREF.php
@@ -68,10 +68,14 @@ final class ISO14496_Box_TREF extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/TREX.php b/src/ISO14496/Box/TREX.php
index 9183fa8..b0e4361 100644
--- a/src/ISO14496/Box/TREX.php
+++ b/src/ISO14496/Box/TREX.php
@@ -75,9 +75,9 @@ final class ISO14496_Box_TREX extends ISO14496_Box_Full
    * @param Reader  $reader The reader object.
    * @todo The sample flags could be parsed further
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_trackId = $this->_reader->readUInt32BE();
     $this->_defaultSampleDescriptionIndex = $this->_reader->readUInt32BE();
diff --git a/src/ISO14496/Box/TRUN.php b/src/ISO14496/Box/TRUN.php
index 10500c2..c6fcc12 100644
--- a/src/ISO14496/Box/TRUN.php
+++ b/src/ISO14496/Box/TRUN.php
@@ -100,9 +100,9 @@ final class ISO14496_Box_TRUN extends ISO14496_Box_Full
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $flags = $this->_flags;
     $sampleCount = $this->_reader->readUInt32BE();
diff --git a/src/ISO14496/Box/UDTA.php b/src/ISO14496/Box/UDTA.php
index 724d831..e38b18d 100644
--- a/src/ISO14496/Box/UDTA.php
+++ b/src/ISO14496/Box/UDTA.php
@@ -62,10 +62,14 @@ final class ISO14496_Box_UDTA extends ISO14496_Box
    *
    * @param Reader $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader = null, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     $this->setContainer(true);
+    
+    if ($reader === null)
+      return;
+    
     $this->constructBoxes();
   }
 }
diff --git a/src/ISO14496/Box/URL.php b/src/ISO14496/Box/URL.php
index f8b7809..2c210d8 100644
--- a/src/ISO14496/Box/URL.php
+++ b/src/ISO14496/Box/URL.php
@@ -66,12 +66,12 @@ final class ISO14496_Box_URL extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_location = $this->_reader->read
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
   }
   
   /**
diff --git a/src/ISO14496/Box/URN.php b/src/ISO14496/Box/URN.php
index ae4c9b8..6d5ce99 100644
--- a/src/ISO14496/Box/URN.php
+++ b/src/ISO14496/Box/URN.php
@@ -69,13 +69,13 @@ final class ISO14496_Box_URN extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     list ($this->_name, $this->_location) = preg_split
       ("/\\x00/", $this->_reader->read
-       ($this->_offset + $this->_size - $this->_reader->getOffset()));
+       ($this->getOffset() + $this->getSize() - $this->_reader->getOffset()));
   }
   
   /**
diff --git a/src/ISO14496/Box/VMHD.php b/src/ISO14496/Box/VMHD.php
index fbf0e9c..a460161 100644
--- a/src/ISO14496/Box/VMHD.php
+++ b/src/ISO14496/Box/VMHD.php
@@ -58,8 +58,8 @@ final class ISO14496_Box_VMHD extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
   }
 }
diff --git a/src/ISO14496/Box/XML.php b/src/ISO14496/Box/XML.php
index 42d8617..5d5aa4f 100644
--- a/src/ISO14496/Box/XML.php
+++ b/src/ISO14496/Box/XML.php
@@ -67,12 +67,12 @@ final class ISO14496_Box_XML extends ISO14496_Box_Full
    *
    * @param Reader  $reader The reader object.
    */
-  public function __construct($reader)
+  public function __construct($reader, &$options = array())
   {
-    parent::__construct($reader);
+    parent::__construct($reader, $options);
     
     $this->_xml = $this->_reader->read
-      ($this->_offset + $this->_size - $this->_reader->getOffset());
+      ($this->getOffset() + $this->getSize() - $this->_reader->getOffset());
   }
   
   /**