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 <?php
 
 /**
  * Zend Framework
  *
  * LICENSE
  *
  * This source file is subject to the new BSD license that is bundled
  * with this package in the file LICENSE.txt.
  * It is also available through the world-wide-web at this URL:
  * http://framework.zend.com/license/new-bsd
  * If you did not receive a copy of the license and are unable to
  * obtain it through the world-wide-web, please send an email
  * to license@zend.com so we can send you a copy immediately.
  *
  * @category   Zend
  * @package    Zend_Gdata
  * @subpackage Gdata
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * A wrapper for strings for buffered reading.
  *
  * @category   Zend
  * @package    Zend_Gdata
  * @subpackage Gdata
  * @copyright  Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  */
 class Zend_Gdata_MimeBodyString
 {
 
     /**
      * The source string.
      *
      * @var string
      */
     protected $_sourceString = '';
 
     /**
      * The size of the MIME message.
      * @var integer
      */
     protected $_bytesRead = 0;
 
     /**
      * Create a new MimeBodyString object.
      *
      * @param string $sourceString The string we are wrapping.
      */
     public function __construct($sourceString)
     {
         $this->_sourceString = $sourceString;
         $this->_bytesRead = 0;
     }
 
     /**
      * Read the next chunk of the string.
      *
      * @param integer $bytesRequested The size of the chunk that is to be read.
      * @return string A corresponding piece of the string.
      */
     public function read($bytesRequested)
     {
       $len = strlen($this->_sourceString);
       if($this->_bytesRead == $len) {
           return FALSE;
       } else if($bytesRequested > $len - $this->_bytesRead) {
           $bytesRequested = $len - $this->_bytesRead;
       }
 
       $buffer = substr($this->_sourceString, $this->_bytesRead, $bytesRequested);
       $this->_bytesRead += $bytesRequested;
 
       return $buffer;
     }
 
     /**
      * The length of the string.
      *
      * @return int The length of the string contained in the object.
      */
     public function getSize()
     {
       return strlen($this->_sourceString);
     }
 
 
 }