ContentStream.php

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<?php
#require_once 'Zend/Pdf/Element/Object.php';
#require_once 'Zend/Pdf/Element/Dictionary.php';
#require_once 'Zend/Pdf/Element/Name.php';
#require_once 'Zend/Pdf/Element/Numeric.php';


#require_once 'Zend/Pdf/Resource.php';


class Zend_Pdf_Resource_ContentStream extends Zend_Pdf_Resource
{
    protected $_bufferedContent = '';

    public function __construct($contentStreamObject = '')
    {
        if ($contentStreamObject !== null &&
            !$contentStreamObject instanceof Zend_Pdf_Element_Object_Stream &&
            !is_string($contentStreamObject)
        ) {
            #require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Content stream parameter must be a string or stream object');
        }

        parent::__construct($contentStreamObject);
    }

    public function addInstructions($instructions)
    {
        $this->_bufferedContent .= $instructions;
        return $this;
    }

    public function getInstructions()
    {
        $this->flush();
        return $this->_resource->value;
    }

    public function clear()
    {
        $this->_resource->value = '';
        $this->_bufferedContent = '';
        return $this;
    }

    public function flush()
    {
        $this->_resource->value .= $this->_bufferedContent;
        $this->_bufferedContent = '';

        return $this;
    }
}