/app/vendors/adapters/ffmpeg-php/php-reader/src/ID3/Object.php

<?php

/**

 * PHP Reader Library

 *

 * Copyright (c) 2008 The PHP Reader Project Workgroup. All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  - Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *  - Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *  - Neither the name of the project workgroup nor the names of its

 *    contributors may be used to endorse or promote products derived from this

 *    software without specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE

 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

 * POSSIBILITY OF SUCH DAMAGE.

 *

 * @package    php-reader

 * @subpackage ID3

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

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

 * @version    $Id: Object.php 75 2008-04-14 23:57:21Z svollbehr $

 */



/**

 * The base class for all ID3v2 objects.

 *

 * @package    php-reader

 * @subpackage ID3

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

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

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

 * @version    $Rev: 75 $

 */

abstract class ID3_Object

{

  /**

   * The reader object.

   *

   * @var Reader

   */

  protected $_reader;

  

  /**

   * The options array.

   *

   * @var Array

   */

  protected $_options;

  

  /**

   * Constructs the class with given parameters and reads object related data

   * from the ID3v2 tag.

   *

   * @param Reader $reader The reader object.

   * @param Array $options The options array.

   */

  public function __construct($reader = null, &$options = array())

  {

    $this->_reader = $reader;

    $this->_options = $options;

  }

  

  /**

   * Returns the options array.

   *

   * @return Array

   */

  public function getOptions() { return $this->_options; }

  

  /**

   * Sets the options array. See {@link ID3v2} class for available options.

   *

   * @param Array $options The options array.

   */

  public function setOptions(&$options) { $this->_options = $options; }

  

  /**

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

   *

   * @param string $name The field name.

   * @return mixed

   */

  public function __get($name)

  {

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

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

      call_user_func

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

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

  }

  

  /**

   * Encodes the given 32-bit integer to 28-bit synchsafe integer, where the

   * most significant bit of each byte is zero, making seven bits out of eight

   * available.

   * 

   * @param integer $val The integer to encode.

   * @return integer

   */

  protected function encodeSynchsafe32($val)

  {

    if (!isset($this->_options["version"]) || $this->_options["version"] >= 4) {

      for ($i = 0, $mask = 0xffffff00; $i < 4; $i++, $mask <<= 8)

        $val = ($val << 1 & $mask) | ($val << 1 & ~$mask) >> 1;

      return $val & 0x7fffffff;

    }

    return $val;

  }



  /**

   * Decodes the given 28-bit synchsafe integer to regular 32-bit integer.

   * 

   * @param integer $val The integer to decode

   * @return integer

   */

  protected function decodeSynchsafe32($val)

  {

    if (!isset($this->_options["version"]) || $this->_options["version"] >= 4)

      for ($i = 0, $mask = 0xff000000; $i < 3; $i++, $mask >>= 8)

        $val = ($val & $mask) >> 1 | ($val & ~$mask);

    return $val;

  }

}