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<?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: LINK.php 105 2008-07-30 14:56:47Z svollbehr $
*/
/**#@+ @ignore */
require_once("ID3/Frame.php");
/**#@-*/
/**
* The <i>Linked information</i> frame is used to keep information duplication
* as low as possible by linking information from another ID3v2 tag that might
* reside in another audio file or alone in a binary file. It is recommended
* that this method is only used when the files are stored on a CD-ROM or other
* circumstances when the risk of file separation is low.
*
* Data should be retrieved from the first tag found in the file to which this
* link points. There may be more than one LINK frame in a tag, but only one
* with the same contents.
*
* A linked frame is to be considered as part of the tag and has the same
* restrictions as if it was a physical part of the tag (i.e. only one
* {@link ID3_Frame_RVRB} frame allowed, whether it's linked or not).
*
* Frames that may be linked and need no additional data are
* {@link ID3_Frame_ASPI}, {@link ID3_Frame_ETCO}, {@link ID3_Frame_EQU2},
* {@link ID3_Frame_MCDI}, {@link ID3_Frame_MLLT}, {@link ID3_Frame_OWNE},
* {@link ID3_Frame_RVA2}, {@link ID3_Frame_RVRB}, {@link ID3_Frame_SYTC}, the
* text information frames (ie frames descendats of
* {@link ID3_Frame_AbstractText}) and the URL link frames (ie frames descendants
* of {@link ID3_Frame_AbstractLink}).
*
* The {@link ID3_Frame_AENC}, {@link ID3_Frame_APIC}, {@link ID3_Frame_GEOB}
* and {@link ID3_Frame_TXXX} frames may be linked with the content descriptor
* as additional ID data.
*
* The {@link ID3_Frame_USER} frame may be linked with the language field as
* additional ID data.
*
* The {@link ID3_Frame_PRIV} frame may be linked with the owner identifier as
* additional ID data.
*
* The {@link ID3_Frame_COMM}, {@link ID3_Frame_SYLT} and {@link ID3_Frame_USLT}
* frames may be linked with three bytes of language descriptor directly
* followed by a content descriptor as additional ID data.
*
* @package php-reader
* @subpackage ID3
* @author Sven Vollbehr <svollbehr@gmail.com>
* @author Ryan Butterfield <buttza@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: 105 $
*/
final class ID3_Frame_LINK extends ID3_Frame
{
/** @var string */
private $_target;
/** @var string */
private $_url;
/** @var string */
private $_qualifier;
/**
* Constructs the class with given parameters and parses object related data.
*
* @param Reader $reader The reader object.
* @param Array $options The options array.
*/
public function __construct($reader = null, &$options = array())
{
parent::__construct($reader, $options);
if ($reader === null)
return;
$this->_target = substr($this->_data, 0, 4);
list($this->_url, $this->_qualifier) =
$this->explodeString8(substr($this->_data, 4), 2);
}
/**
* Returns the target tag identifier.
*
* @return string
*/
public function getTarget() { return $this->_target; }
/**
* Sets the target tag identifier.
*
* @param string $target The target tag identifier.
*/
public function setTarget($target) { $this->_target = $target; }
/**
* Returns the target tag URL.
*
* @return string
*/
public function getUrl() { return $this->_url; }
/**
* Sets the target tag URL.
*
* @param string $url The target URL.
*/
public function setUrl($url) { $this->_url = $url; }
/**
* Returns the additional data to identify further the tag.
*
* @return string
*/
public function getQualifier() { return $this->_qualifier; }
/**
* Sets the additional data to be used in tag identification.
*
* @param string $identifier The qualifier.
*/
public function setQualifier($qualifier)
{
$this->_qualifier = $qualifier;
}
/**
* Returns the frame raw data.
*
* @return string
*/
public function __toString()
{
$this->setData
(Transform::toString8(substr($this->_target, 0, 4), 4) .
$this->_url . "\0" . $this->_qualifier);
return parent::__toString();
}
}
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