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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_Pdf
* @subpackage FileParser
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: String.php 18993 2009-11-15 17:09:16Z alexander $
*/
/** Zend_Pdf_FileParserDataSource */
require_once 'Zend/Pdf/FileParserDataSource.php';
/**
* Concrete subclass of {@link Zend_Pdf_FileParserDataSource} that provides an
* interface to binary strings.
*
* @package Zend_Pdf
* @subpackage FileParser
* @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_FileParserDataSource_String extends Zend_Pdf_FileParserDataSource
{
/**** Instance Variables ****/
/**
* The string to parse.
* @var string
*/
protected $_string = '';
/**** Public Interface ****/
/* Concrete Class Implementation */
/**
* Object constructor.
*
* Verifies that the string is not empty.
*
* @param string $string String to parse.
*/
public function __construct($string)
{
if (empty($string)) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('String is empty',
Zend_Pdf_Exception::PARAMETER_VALUE_OUT_OF_RANGE);
}
$this->_size = strlen($string);
$this->_string = $string;
}
/**
* Object destructor.
*/
public function __destruct()
{
$this->_string = '';
}
/**
* Returns the specified number of raw bytes from the string at the byte
* offset of the current read position.
*
* Advances the read position by the number of bytes read.
*
* Throws an exception if there is insufficient data to completely fulfill
* the request.
*
* @param integer $byteCount Number of bytes to read.
* @return string
* @throws Zend_Pdf_Exception
*/
public function readBytes($byteCount)
{
if (($this->_offset + $byteCount) > $this->_size) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception("Insufficient data to read $byteCount bytes",
Zend_Pdf_Exception::INSUFFICIENT_DATA);
}
$bytes = substr($this->_string, $this->_offset, $byteCount);
$this->_offset += $byteCount;
return $bytes;
}
/**
* Returns the entire string.
*
* Preserves the current read position.
*
* @return string
*/
public function readAllBytes()
{
return $this->_string;
}
/* Object Magic Methods */
/**
* Returns a string containing the parsed string's length.
*
* @return string
*/
public function __toString()
{
return "String ($this->_size bytes)";
}
}
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