/app/vendors/adapters/ffmpeg-php/php-reader/src/Reader.php

<?php

/**

 * PHP Reader Library

 *

 * Copyright (c) 2006-2008 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

 * @copyright Copyright (c) 2006-2008 The PHP Reader Project Workgroup

 * @license   http://code.google.com/p/php-reader/wiki/License New BSD License

 * @version   $Id: Reader.php 39 2008-03-26 17:27:22Z svollbehr $

 */



/**#@+ @ignore */

require_once("Reader/Exception.php");

require_once("Transform.php");

/**#@-*/



/**

 * The Reader class encapsulates a file. It is hence responsible of upkeeping

 * the connection to the file, keeping track of the cursor position and reading

 * data from it.

 * 

 * @package   php-reader

 * @author    Sven Vollbehr <svollbehr@gmail.com>

 * @copyright Copyright (c) 2006-2008 The PHP Reader Project Workgroup

 * @license   http://code.google.com/p/php-reader/wiki/License New BSD License

 * @version   $Rev: 39 $

 */

class Reader

{

  /** @var resource */

  private $_fd;

  

  /** @var integer */

  private $_size;

  

  /**

   * Constructs the Reader class with given file.

   * 

   * @param string $filename The path to the file.

   * @param string $mode     The type of access.

   * @throws Reader_Exception if the file cannot be read.

   */

  public function __construct($filename, $mode = "rb")

  {

    if (($this->_fd = fopen($filename, $mode)) === false)

      throw new Reader_Exception("Unable to open file:" . $filename);

    

    fseek($this->_fd, 0, SEEK_END);

    $this->_size = ftell($this->_fd);

    fseek($this->_fd, 0);

  }

  

  /**

   * Closes the file.

   */

  public function __destruct()

  {

    @fclose($this->_fd);

  }

  

  /**

   * Checks whether there is more to be read in the file. Returns

   * <var>true</var> if the end of the file has not yet been reached;

   * <var>false</var> otherwise.

   * 

   * @return boolean 

   */

  public function available()

  {

    return $this->getOffset() < $this->_size;

  }

  

  /**

   * Jumps <var>size</var> amount of bytes in the file stream.

   * 

   * @param integer $size The amount of bytes.

   * @return void

   * @throws Reader_Exception if <var>size</var> attribute is negative.

   */

  public function skip($size)

  {

    if ($size < 0)

      throw new Reader_Exception("Invalid argument");

    if ($size == 0)

      return;

    fseek($this->_fd, $size, SEEK_CUR);

  }

  

  /**

   * Reads <var>length</var> amount of bytes from the file stream.

   * 

   * @param integer $length The amount of bytes.

   * @return string

   * @throws Reader_Exception if <var>length</var> attribute is negative.

   */

  public function read($length)

  {

    if ($length < 0)

      throw new Reader_Exception("Invalid argument");

    if ($length == 0)

      return "";

    return fread($this->_fd, $length);

  }

  

  /**

   * Returns the current point of operation.

   * 

   * @return integer

   */

  public function getOffset()

  {

    return ftell($this->_fd);

  }



  /**

   * Sets the point of operation, ie the cursor offset value. The offset can

   * also be set to a negative value when it is interpreted as an offset from

   * the end of the file instead of the beginning.

   * 

   * @param integer $offset The new point of operation.

   * @return void

   */

  public function setOffset($offset)

  {

    fseek($this->_fd, $offset < 0 ? $this->_size + $offset : $offset);

  }

  

  /**

   * Returns the file size in bytes.

   * 

   * @return integer

   */

  public function getSize()

  {

    return $this->_size;

  }

  

  /**

   * Magic function so that $obj->value will work.

   *

   * @param string $name The field name.

   * @return mixed

   */

  public function __get($name) {

    if (method_exists($this, "get" . ucfirst(strtolower($name))))

      return call_user_func(array($this, "get" . ucfirst(strtolower($name))));

    else throw new Reader_Exception("Unknown 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($this, "set" . ucfirst(strtolower($name))))

      call_user_func

        (array($this, "set" . ucfirst(strtolower($name))), $value);

    else throw new Reader_Exception("Unknown field: " . $name);

  }

  

  /**

   * Magic function to delegate the call to helper methods of

   * <var>Transform</var> class to transform read data in another format.

   *

   * The read data length is determined from the helper method name. For methods

   * where arbitrary data lengths are accepted a parameter can be used to

   * specify the length.

   *

   * @param string $method The method to be called.

   * @param string $params The parameters should the function accept them.

   * @return mixed

   * @throws Reader_Exception if no such transformer is implemented

   */

  public function __call($method, $params) {

    $chunks = array();

    if (preg_match

          ("/read([a-z]{3,6})?(\d{1,2})?(?:LE|BE)?/i", $method, $chunks) &&

        method_exists("Transform", preg_replace("/^read/", "from", $method))) {

      return call_user_func

        (array("Transform", preg_replace("/^read/", "from", $method)),

         $this->read(preg_match("/String|(?:H|L)Hex/", $chunks[1]) ?

                     (isset($params[0]) ? $params[0] : 1) :

                     ($chunks[1] == "GUID" ? 16 : $chunks[2] / 8)));

    } else throw new Reader_Exception("Unknown method: " . $method);

  }

}