String.php

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<?php
#require_once 'Zend/Pdf/FileParserDataSource.php';

class Zend_Pdf_FileParserDataSource_String extends Zend_Pdf_FileParserDataSource
{
  /**** Instance Variables ****/


    protected $_string = '';



  /**** Public Interface ****/


  /* Concrete Class Implementation */

    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;
    }

    public function __destruct()
    {
        $this->_string = '';
    }

    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;
    }

    public function readAllBytes()
    {
        return $this->_string;
    }


  /* Object Magic Methods */

    public function __toString()
    {
        return "String ($this->_size bytes)";
    }
}