c6c10d7ce8
git-svn-id: http://php-reader.googlecode.com/svn/trunk@139 51a70ab9-7547-0410-9469-37e369ee0574
108 lines
4.1 KiB
PHP
108 lines
4.1 KiB
PHP
<?php
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/**
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* PHP Reader Library
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*
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* Copyright (c) 2008-2009 The PHP Reader Project Workgroup. All rights
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* reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* - Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* - Neither the name of the project workgroup nor the names of its
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* contributors may be used to endorse or promote products derived from this
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* software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* @package php-reader
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* @subpackage ASF
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* @copyright Copyright (c) 2008-2009 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Id$
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*/
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/**#@+ @ignore */
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require_once("ASF/Object.php");
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/**#@-*/
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/**
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* The <i>Padding Object</i> is a dummy object that is used to pad the size of
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* the <i>Header Object</i>. This object enables the size of any object stored
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* in the <i>Header Object</i> to grow or shrink without having to rewrite the
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* entire <i>Data Object</i> and <i>Index Object</i> sections of the ASF file.
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* For instance, if entries in the <i>Content Description Object</i> or
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* <i>Extended Content Description Object</i> need to be removed or shortened,
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* the size of the <i>Padding Object</i> can be increased to compensate for the
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* reduction in size of the <i>Content Description Object</i>. The ASF file can
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* then be updated by overwriting the previous <i>Header Object</i> with the
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* edited <i>Header Object</i> of identical size, without having to move or
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* rewrite the data contained in the <i>Data Object</i>.
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*
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* @package php-reader
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* @subpackage ASF
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* @author Sven Vollbehr <svollbehr@gmail.com>
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* @copyright Copyright (c) 2008-2009 The PHP Reader Project Workgroup
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* @license http://code.google.com/p/php-reader/wiki/License New BSD License
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* @version $Rev$
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*/
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final class ASF_Object_Padding extends ASF_Object
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{
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/**
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* Constructs the class with given parameters and reads object related data
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* from the ASF file.
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*
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* @param Reader $reader The reader object.
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* @param Array $options The options array.
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*/
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public function __construct($reader = null, &$options = array())
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{
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parent::__construct($reader, $options);
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}
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/**
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* Returns the whether the object is required to be present, or whether
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* minimum cardinality is 1.
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*
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* @return boolean
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*/
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public function isMandatory() { return false; }
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/**
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* Returns whether multiple instances of this object can be present, or
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* whether maximum cardinality is greater than 1.
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*
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* @return boolean
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*/
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public function isMultiple() { return true; }
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/**
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* Returns the object data with headers.
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*
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* @return string
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*/
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public function __toString()
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{
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if ($this->getSize() == 0)
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$this->setSize(24);
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return
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Transform::toGUID($this->getIdentifier()) .
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Transform::toInt64LE($this->getSize()) .
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str_pad("", $this->getSize() - 24 /* header */, "\0");
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}
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}
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