<?php

 /* @(#) $Header: /sources/phpprintipp/phpprintipp/php_classes/PrintIPP.php,v 1.3 2010/09/06 22:41:41 harding Exp $
 *
 * Class PrintIPP - Send IPP requests, Get and parses IPP Responses.
 *
 *   Copyright (C) 2005-2006  Thomas HARDING
 *   Parts Copyright (C) 2005-2006 Manuel Lemos
 *
 *   This library is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU Library General Public
 *   License as published by the Free Software Foundation; either
 *   version 2 of the License, or (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *   Library General Public License for more details.
 *
 *   You should have received a copy of the GNU Library General Public
 *   License along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *   mailto:thomas.harding@laposte.net
 *   Thomas Harding, 56 rue de la bourie rouge, 45 000 ORLEANS -- FRANCE
 *   
 */
    
/*

    This class is intended to implement Internet Printing Protocol on client side.

    References needed to debug / add functionnalities:
        - RFC 2910
        - RFC 2911
        - RFC 3380
        - RFC 3382
*/
/*
    TODO: beta tests on other servers than Cups
*/

require_once("BasicIPP.php");

class PrintIPP extends BasicIPP
{
    public function __construct()
    {
        parent::__construct();
    }

// OPERATIONS
    public function printJob()
    {
        self::_putDebug( sprintf("*************************\nDate: %s\n*************************\n\n",date('Y-m-d H:i:s')));

        if (!$this->_stringJob())
        {
            return FALSE;
        }

        if (is_readable($this->data))
        {
            self::_putDebug( _("Printing a FILE\n"),3); 

            $this->output = $this->stringjob;

            if ($this->setup->datatype == "TEXT")
            {
                $this->output .= chr(0x16);
            }

            $post_values = array( "Content-Type" => "application/ipp",
                                  "Data" => $this->output,
                                  "File" => $this->data);

            if ($this->setup->datatype == "TEXT" && !isset($this->setup->noFormFeed))
            {
                $post_values = array_merge($post_values,array("Filetype"=>"TEXT"));
            }
        }
        else
        {
            self::_putDebug( _("Printing DATA\n"),3); 

            $this->output = $this->stringjob;
            $this->output .= $this->datahead;    
            $this->output .= $this->data;
            $this->output .= $this->datatail;
            
            $post_values = array( "Content-Type" => "application/ipp",
                                  "Data" => $this->output);
        }

        if (self::_sendHttp ($post_values,$this->paths['printers']))
        {
            if(self::_parseServerOutput())
            {
                $this->_getJobId();
                $this->_getJobUri();
                $this->_parseJobAttributes();
            }
            else
            {
                $this->jobs = array_merge($this->jobs,array(''));
                $this->jobs_uri = array_merge($this->jobs_uri,array(''));
                }
            }

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if ($this->serveroutput->status == "successfull-ok")
            {
              self::_errorLog(sprintf("printing job %s: ",$this->last_job) .$this->serveroutput->status,3);
            }
            else
            {
                $this->jobs = array_merge($this->jobs,array(""));
                $this->jobs_uri = array_merge($this->jobs_uri,array(""));
                self::_errorLog(sprintf("printing job: ",$this->last_job) .$this->serveroutput->status,1);
                if ($this->with_exceptions)
                {
                    throw new ippException(sprintf("job status: %s",
                    $this->serveroutput->status));
                }
            }
            return $this->serveroutput->status; 
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));
        self::_errorLog("printing job : OPERATION FAILED",1);

        return false;
    }

    public function cancelJob ($job_uri)
    {
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));

        self::_putDebug( sprintf("*************************\nDate: %s\n*************************\n\n",date('Y-m-d H:i:s')));

        if (!$this->_stringCancel($job_uri))
        {
            return FALSE;
        }

        self::_putDebug( _("Cancelling Job $job_uri\n"),3); 

        $this->output = $this->stringjob;

        $post_values = array( "Content-Type"=>"application/ipp",
                              "Data"=>$this->output);

        if (self::_sendHttp ($post_values,$this->paths['jobs']))
        {
            self::_parseServerOutput();
        }

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if ($this->serveroutput->status == "successfull-ok")
            {
                self::_errorLog("cancelling job $job_uri: ".$this->serveroutput->status,3);
            }
            else
            {
                self::_errorLog("cancelling job $job_uri: ".$this->serveroutput->status,1);
            }
            return $this->serveroutput->status; 
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        self::_errorLog("cancelling job : OPERATION FAILED",3);

        return false;
    }

    public function validateJob ()
    {
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));

        $this->serveroutput->response = '';

        self::_putDebug( sprintf("*************************\nDate: %s\n*************************\n\n",date('Y-m-d H:i:s')));

        self::_putDebug( _("Validate Job\n"),2); 

        if (!isset($this->setup->charset))
        {
            self::setCharset();
        }
        if (!isset($this->setup->datatype))
        {
            self::setBinary();
        }

        if (!isset($this->setup->uri))
        {
            $this->getPrinters();
            unset($this->jobs[count($this->jobs) - 1]);
            unset($this->jobs_uri[count($this->jobs_uri) - 1]);
            unset($this->status[count($this->status) - 1]);

            if (array_key_exists(0,$this->available_printers))
            {
               self::setPrinterURI($this->available_printers[0]);
            }
            else
            {
                trigger_error(_("_stringJob: Printer URI is not set: die"),E_USER_WARNING);
                self::_putDebug( _("_stringJob: Printer URI is not set: die\n"),3);
                self::_errorLog(" Printer URI is not set, die",2);
                return FALSE;
                }
            }

        if (!isset($this->meta->copies))
        {
            self::setCopies(1);
        }

        if (!isset($this->setup->copies))
        {
            self::setCopies(1);
        }

        if (!isset($this->setup->language))
        {
            self::setLanguage('en_us');
        }

        if (!isset($this->setup->mime_media_type))
        {
            self::setMimeMediaType();
        }

        if ($this->setup->datatype != "TEXT")
        {
            unset ($this->setup->mime_media_type);
        }

        if (!isset($this->setup->jobname))
        {
            if (is_readable($this->data))
            {
                self::setJobName(basename($this->data),true);
            }
            else
            {
                self::setJobName();
            }
        }
        unset($this->setup->jobname);

        if (!isset($this->meta->username))
        {
            self::setUserName();
        }

        if (!isset($this->meta->fidelity))
        {
            $this->meta->fidelity = '';
        }

        if (!isset($this->meta->document_name))
        {
            $this->meta->document_name = '';
        }

        if (!isset($this->meta->sides))
        {
            $this->meta->sides = '';
        }

        if (!isset($this->meta->page_ranges))
        {
            $this->meta->page_ranges = '';
        }

        $jobattributes = '';
        $operationattributes = '';
        $printerattributes = '';
        self::_buildValues ($operationattributes,$jobattributes,$printerattributes);

        self::_setOperationId();

        $this->stringjob = chr(0x01) . chr(0x01) // 1.1  | version-number
                         . chr(0x00) . chr (0x04) // Validate-Job | operation-id
                         . $this->meta->operation_id //           request-id
                         . chr(0x01) // start operation-attributes | operation-attributes-tag
                         . $this->meta->charset
                         . $this->meta->language
                         . $this->meta->printer_uri
                         . $this->meta->username
                         . $this->meta->jobname
                         . $this->meta->fidelity
                         . $this->meta->document_name
                         . $this->meta->mime_media_type
                         . $operationattributes
                         . chr(0x02) // start job-attributes | job-attributes-tag
                         . $this->meta->copies
                         . $this->meta->sides
                         . $this->meta->page_ranges
                         . $jobattributes
                         . chr(0x03); // end-of-attributes | end-of-attributes-tag

        self::_putDebug( sprintf(_("String sent to the server is:\n%s\n"), $this->stringjob));

        $this->output = $this->stringjob;

        $post_values = array( "Content-Type"=>"application/ipp",
                              "Data"=>$this->output);

        if (self::_sendHttp ($post_values,$this->paths['printers']))
        {
            if(self::_parseServerOutput())
            {
                self::_parseAttributes();
            }
        }

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if ($this->serveroutput->status == "successfull-ok")
            {
                self::_errorLog("validate job: ".$this->serveroutput->status,3);
            }
            else
            {
                self::_errorLog("validate job: ".$this->serveroutput->status,1);
            }
            return $this->serveroutput->status; 
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        self::_errorLog("validate job : OPERATION FAILED",3);

        return false;
    }

    public function getPrinterAttributes()
    {
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));

        $jobattributes = '';
        $operationattributes = '';
        self::_buildValues($operationattributes,$jobattributes,$printerattributes);
        self::_setOperationId();
        $this->parsed = array();
        unset($this->printer_attributes);

        if (!isset($this->setup->uri))
        {
            $this->getPrinters();
            unset($this->jobs[count($this->jobs) - 1]);
            unset($this->jobs_uri[count($this->jobs_uri) - 1]);
            unset($this->status[count($this->status) - 1]);

            if (array_key_exists(0,$this->available_printers))
            {
               self::setPrinterURI($this->available_printers[0]);
            }
            else
            {
                trigger_error(_("_stringJob: Printer URI is not set: die"),E_USER_WARNING);
                self::_putDebug( _("_stringJob: Printer URI is not set: die\n"),3);
                self::_errorLog(" Printer URI is not set, die",2);
                return FALSE;
                }
            }

        if (!isset($this->setup->charset))
        {
            self::setCharset();
        }

        if (!isset($this->setup->language))
        {
            self::setLanguage('en_us');
        }

        if (!isset($this->meta->username))
        {
            self::setUserName();
        }

        $this->stringjob = chr(0x01) . chr(0x01) // 1.1  | version-number
                         . chr(0x00) . chr (0x0b) // Print-URI | operation-id
                         . $this->meta->operation_id //           request-id
                         . chr(0x01) // start operation-attributes | operation-attributes-tag
                         . $this->meta->charset
                         . $this->meta->language
                         . $this->meta->printer_uri
                         . $this->meta->username
                         . $printerattributes
                         . chr(0x03); // end-of-attributes | end-of-attributes-tag

        self::_putDebug(sprintf(_("String sent to the server is:\n%s\n"), $this->stringjob));

        self::_putDebug(sprintf(_("Getting printer attributes of %s\n"),$this->printer_uri),2); 

        $this->output = $this->stringjob;

        $post_values = array( "Content-Type"=>"application/ipp",
                              "Data"=>$this->output);

        if (self::_sendHttp ($post_values,$this->paths['root']))
        {
            if (self::_parseServerOutput())
            {
                self::_parsePrinterAttributes(); 
            }
        }

        $this->attributes = &$this->printer_attributes;

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if  ($this->serveroutput->status == "successfull-ok")
            {
                self::_errorLog(sprintf(_("getting printer attributes of %s: %s"),$this->printer_uri,
                                                                        $this->serveroutput->status),3);
            }
            else 
            {
                self::_errorLog(sprintf(_("getting printer attributes of %s: %s"),$this->printer_uri,
                                                                        $this->serveroutput->status),1);
            }

            return $this->serveroutput->status;
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        self::_errorLog(date("Y-m-d H:i:s : ")
            .basename($_SERVER['PHP_SELF'])
            .sprintf(_("getting printer's attributes of %s : OPERATION FAILED"),
                $this->printer_uri),3);

        return false;
    }

    public function getJobs($my_jobs=true,$limit=0,$which_jobs="not-completed",$subset=false)
    {
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));

        self::_setOperationId();
        $this->parsed = array();
        unset($this->printer_attributes);

        if (!isset($this->setup->uri))
        {
            $this->getPrinters();
            unset($this->jobs[count($this->jobs) - 1]);
            unset($this->jobs_uri[count($this->jobs_uri) - 1]);
            unset($this->status[count($this->status) - 1]);

            if (array_key_exists(0,$this->available_printers))
            {
               self::setPrinterURI($this->available_printers[0]);
            }
            else
            {
                trigger_error(_("getJobs: Printer URI is not set: die"),E_USER_WARNING);
                self::_putDebug( _("_stringJob: Printer URI is not set: die\n"),3);
                self::_errorLog("getJobs: Printer URI is not set, die",2);
                return FALSE;
                }
            }

        if (!isset($this->setup->charset))
        {
            self::setCharset();
        }

        if (!isset($this->setup->language))
        {
            self::setLanguage('en_us');
        }

        if (!isset($this->meta->username))
        {
            self::setUserName();
        }

        if ($limit)
        {
            $limit = self::_integerBuild($limit);
            $this->meta->limit = chr(0x21) // integer
                               . self::_giveMeStringLength('limit')
                               . 'limit'
                               . self::_giveMeStringLength($limit)
                               . $limit;
        }
        else
        {
            $this->meta->limit = '';
        }

        if ($which_jobs == 'completed')
        {
                $this->meta->which_jobs = chr(0x44) // keyword
                                        . self::_giveMeStringLength('which-jobs')
                                        . 'which-jobs'
                                        . self::_giveMeStringLength($which_jobs)
                                        . $which_jobs;
        }
        else
        {
            $this->meta->which_jobs = "";
        }

        if ($my_jobs)
        {
            $this->meta->my_jobs = chr(0x22) // boolean
                                 . self::_giveMeStringLength('my-jobs')
                                 . 'my-jobs'
                                 . self::_giveMeStringLength(chr(0x01))
                                 . chr(0x01);
        }
        else
        {
            $this->meta->my_jobs = '';
        }

        $this->stringjob = chr(0x01) . chr(0x01) // 1.1  | version-number
                         . chr(0x00) . chr (0x0A) // Get-Jobs | operation-id
                         . $this->meta->operation_id //           request-id
                         . chr(0x01) // start operation-attributes | operation-attributes-tag
                         . $this->meta->charset
                         . $this->meta->language
                         . $this->meta->printer_uri
                         . $this->meta->username
                         . $this->meta->limit
                         . $this->meta->which_jobs 
                         . $this->meta->my_jobs;
       if ($subset)
       {
           $this->stringjob .=
                          chr(0x44) // keyword
                         . self::_giveMeStringLength('requested-attributes')
                         . 'requested-attributes'
                         . self::_giveMeStringLength('job-uri')
                         . 'job-uri'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-name')
                         . 'job-name'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-state')
                         . 'job-state'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-state-reason')
                         . 'job-state-reason';
        }
        else
        { # cups 1.4.4 doesn't return much of anything without this
            $this->stringjob .=
                          chr(0x44) // keyword
                         . self::_giveMeStringLength('requested-attributes')
                         . 'requested-attributes'
                         . self::_giveMeStringLength('all')
                         . 'all';
        }
        $this->stringjob .= chr(0x03); // end-of-attributes | end-of-attributes-tag

        self::_putDebug(sprintf(_("String sent to the server is:\n%s\n"), $this->stringjob));

        self::_putDebug(sprintf(_("getting jobs of %s\n"),$this->printer_uri),2); 

        $this->output = $this->stringjob;

        $post_values = array( "Content-Type"=>"application/ipp",
                              "Data"=>$this->output);

        if (self::_sendHttp ($post_values,$this->paths['jobs']))
        {
            if (self::_parseServerOutput())
            {
                self::_parseJobsAttributes();
            }
        }

        $this->attributes = &$this->jobs_attributes;

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if ($this->serveroutput->status == "successfull-ok")
            {
                self::_errorLog(sprintf(_("getting jobs of printer %s: "),$this->printer_uri)
                            .$this->serveroutput->status,3);
            }
            else
            {
                 self::_errorLog(sprintf(_("getting jobs of printer %s: "),$this->printer_uri)
                                             .$this->serveroutput->status,1);
            }

            return $this->serveroutput->status;
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        self::_errorLog(date("Y-m-d H:i:s : ")
                        .basename($_SERVER['PHP_SELF'])
                        .sprintf(_("getting jobs of %s : OPERATION FAILED"),
                                     $this->printer_uri),3);

    return false;
    }


    public function getJobAttributes($job_uri,$subset=false,$attributes_group="all")
    {
        $this->jobs = array_merge($this->jobs,array(""));
        $this->jobs_uri = array_merge($this->jobs_uri,array(""));

        if (!$job_uri)
        {
            trigger_error(_("getJobAttributes: Job URI is not set, die."));
            return FALSE;
            }

        self::_setOperationId();
        $this->parsed = array();
        unset($this->printer_attributes);

        if (!isset($this->setup->uri))
        {
            $this->getPrinters();
            unset($this->jobs[count($this->jobs) - 1]);
            unset($this->jobs_uri[count($this->jobs_uri) - 1]);
            unset($this->status[count($this->status) - 1]);

            if (array_key_exists(0,$this->available_printers))
            {
               self::setPrinterURI($this->available_printers[0]);
            }
            else
            {
                trigger_error(_("getJobs: Printer URI is not set: die"),E_USER_WARNING);
                self::_putDebug( _("_stringJob: Printer URI is not set: die\n"),3);
                self::_errorLog("getJobs: Printer URI is not set, die",2);
                return FALSE;
            }
        }

        if (!isset($this->setup->charset))
        {
            self::setCharset();
        }

        if (!isset($this->setup->language))
        {
            self::setLanguage('en_us');
        }

        if (!isset($this->meta->username))
        {
            self::setUserName();
        }

        $this->meta->job_uri = chr(0x45) // URI
                             . self::_giveMeStringLength('job-uri')
                             . 'job-uri'
                             . self::_giveMeStringLength($job_uri)
                             . $job_uri;

        $this->stringjob = chr(0x01) . chr(0x01) // 1.1  | version-number
                         . chr(0x00) . chr (0x09) // Get-Job-Attributes | operation-id
                         . $this->meta->operation_id //           request-id
                         . chr(0x01) // start operation-attributes | operation-attributes-tag
                         . $this->meta->charset
                         . $this->meta->language
                         . $this->meta->job_uri
                         . $this->meta->username;
        if ($subset)
        {
            $this->stringjob .=
                          chr(0x44) // keyword
                         . self::_giveMeStringLength('requested-attributes')
                         . 'requested-attributes'
                         . self::_giveMeStringLength('job-uri')
                         . 'job-uri'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-name')
                         . 'job-name'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-state')
                         . 'job-state'
                         . chr(0x44) // keyword
                         . self::_giveMeStringLength('')
                         . ''
                         . self::_giveMeStringLength('job-state-reason')
                         . 'job-state-reason';
        }
        elseif($attributes_group)
        {
            switch($attributes_group)
            {
                case 'job-template':
                    break;
                case 'job-description':
                    break;
                case 'all':
                    break;
                default:
                    trigger_error(_('not a valid attribute group: ').$attributes_group,E_USER_NOTICE);
                    $attributes_group = '';
                    break;
            }
            $this->stringjob .=
                          chr(0x44) // keyword
                         . self::_giveMeStringLength('requested-attributes')
                         . 'requested-attributes'
                         . self::_giveMeStringLength($attributes_group)
                         . $attributes_group;
        }
        $this->stringjob .= chr(0x03); // end-of-attributes | end-of-attributes-tag

        self::_putDebug(sprintf(_("String sent to the server is:\n%s\n"), $this->stringjob));

        self::_putDebug(sprintf(_("getting jobs of %s\n"),$this->printer_uri),2); 

        $this->output = $this->stringjob;

        $post_values = array( "Content-Type"=>"application/ipp",
                              "Data"=>$this->output);

        if (self::_sendHttp ($post_values,$this->paths['jobs']))
        {
            if (self::_parseServerOutput())
            {
                self::_parseJobAttributes();
            }
        }

        $this->attributes = &$this->job_attributes;

        if (isset($this->serveroutput) && isset($this->serveroutput->status))
        {
            $this->status = array_merge($this->status,array($this->serveroutput->status));

            if ($this->serveroutput->status == "successfull-ok")
            {
                self::_errorLog(sprintf(_("getting job attributes for %s: "),$job_uri)
                            .$this->serveroutput->status,3);
            }
            else
            {
                 self::_errorLog(sprintf(_("getting job attributes for %s: "),$job_uri)
                                             .$this->serveroutput->status,1);
            }

            return $this->serveroutput->status;
        }

        $this->status = array_merge($this->status,array("OPERATION FAILED"));
        self::_errorLog(date("Y-m-d H:i:s : ")
                        .basename($_SERVER['PHP_SELF'])
                        .sprintf(_("getting jobs attributes of %s : OPERATION FAILED"),
                                     $job_uri),3);

        return false;
    }

    public function getPrinters()
    {
        // placeholder for vendor extension operation (getAvailablePrinters for CUPS)
        $this->jobs = array_merge($this->jobs,array(''));
        $this->jobs_uri = array_merge($this->jobs_uri,array(''));
        $this->status = array_merge($this->status,array(''));    
    }

    public function generateError ($error)
    {
        switch ($error)
        {
            case "request_body_malformed":
                $this->error_generation->request_body_malformed = chr(0xFF);
                break;
            default:
                true;
                break;
        }

        trigger_error(sprintf(_('Setting Error %s'),$error),E_USER_NOTICE);
    }
    
    public function resetError ($error)
    {
        unset ($this->error_generation->$error);
        trigger_error(sprintf(_('Reset Error %s'),$error),E_USER_NOTICE);
    }

    // SETUP
    protected function _setOperationId ()
    {
            $prepend = '';
            $this->operation_id += 1;
            $this->meta->operation_id = self::_integerBuild($this->operation_id);
            self::_putDebug( "operation id is: ".$this->operation_id."\n",2);
    }
    
    protected function _setJobId()
    {

        $this->meta->jobid +=1;
        $prepend = '';
        $prepend_length = 4 - strlen($this->meta->jobid);
        for ($i = 0; $i < $prepend_length ; $i++ )
        {
            $prepend .= '0';
        }

    return $prepend.$this->meta->jobid;
    }
    
    protected function _setJobUri ($job_uri)
    {
        $this->meta->job_uri = chr(0x45) // type uri
                             . chr(0x00).chr(0x07) // name-length
                             . "job-uri"
                             //. chr(0x00).chr(strlen($job_uri))
                             . self::_giveMeStringLength($job_uri)
                             . $job_uri;
        
        self::_putDebug( "job-uri is: ".$job_uri."\n",2);
    }

    // RESPONSE PARSING
    protected function _parsePrinterAttributes()
    {
        //if (!preg_match('#successful#',$this->serveroutput->status))
        //   return false;

        $k = -1;
        $l = 0;
        for ($i = 0 ; $i < count($this->serveroutput->response) ; $i++)
        {
            for ($j = 0 ; $j < (count($this->serveroutput->response[$i]) - 1) ; $j ++)
            {
                if (!empty($this->serveroutput->response[$i][$j]['name']))
                {
                    $k++;
                    $l = 0;
                    $this->parsed[$k]['range'] = $this->serveroutput->response[$i]['attributes'];
                    $this->parsed[$k]['name'] = $this->serveroutput->response[$i][$j]['name'];
                    $this->parsed[$k]['type'] = $this->serveroutput->response[$i][$j]['type'];
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
                else
                {
                    $l ++;
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                    }
            }
        }
        $this->serveroutput->response = array();

        $this->printer_attributes = new \stdClass();
        for ($i = 0 ; $i < count($this->parsed) ; $i ++)
        {
                    $name = $this->parsed[$i]['name'];
                    $php_name = str_replace('-','_',$name);
                    $type = $this->parsed[$i]['type'];
                    $range = $this->parsed[$i]['range'];
                    $this->printer_attributes->$php_name = new \stdClass();
                    $this->printer_attributes->$php_name->_type = $type;
                    $this->printer_attributes->$php_name->_range = $range;
                    for ($j = 0 ; $j < (count($this->parsed[$i]) - 3) ; $j ++)
                    {
                        $value = $this->parsed[$i][$j];
                        $index = '_value'.$j;
                        $this->printer_attributes->$php_name->$index = $value;
                        }
                    }

        $this->parsed = array();
    }

    protected function _parseJobsAttributes()
    {
        //if ($this->serveroutput->status != "successfull-ok")
        //    return false;

        $job = -1;
        $l = 0;
        for ($i = 0 ; $i < count($this->serveroutput->response) ; $i++)
        {
            if ($this->serveroutput->response[$i]['attributes'] == "job-attributes")
            {
                $job ++;
            }
            $k = -1; 
            for ($j = 0 ; $j < (count($this->serveroutput->response[$i]) - 1) ; $j ++)
            {
                if (!empty($this->serveroutput->response[$i][$j]['name']))
                {
                    $k++;
                    $l = 0;
                    $this->parsed[$job][$k]['range'] = $this->serveroutput->response[$i]['attributes'];
                    $this->parsed[$job][$k]['name'] = $this->serveroutput->response[$i][$j]['name'];
                    $this->parsed[$job][$k]['type'] = $this->serveroutput->response[$i][$j]['type'];
                    $this->parsed[$job][$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
                else
                {
                    $l ++;
                    $this->parsed[$job][$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
            }
        }

        $this->serveroutput->response = array();
        $this->jobs_attributes = new \stdClass();
        for ($job_nbr = 0 ; $job_nbr <= $job ; $job_nbr ++)
        {
            $job_index = "job_".$job_nbr;
            $this->jobs_attributes->$job_index = new \stdClass();
            for ($i = 0 ; $i < count($this->parsed[$job_nbr]) ; $i ++)
            {
                $name = $this->parsed[$job_nbr][$i]['name'];
                $php_name = str_replace('-','_',$name);
                $type = $this->parsed[$job_nbr][$i]['type'];
                $range = $this->parsed[$job_nbr][$i]['range'];
                $this->jobs_attributes->$job_index->$php_name = new \stdClass();
                $this->jobs_attributes->$job_index->$php_name->_type = $type;
                $this->jobs_attributes->$job_index->$php_name->_range = $range;
                for ($j = 0 ; $j < (count($this->parsed[$job_nbr][$i]) - 3) ; $j ++)
                {
                    # This causes incorrect parsing of integer job attributes.
                    # 2010-08-16
                    # bpkroth
                    #$value = self::_interpretAttribute($name,$type,$this->parsed[$job_nbr][$i][$j]);
                    $value = $this->parsed[$job_nbr][$i][$j];
                    $index = '_value'.$j;
                    $this->jobs_attributes->$job_index->$php_name->$index = $value;
                }
            }
        }

        $this->parsed = array();
    }

    protected function _readAttribute($attributes_type)
    {
        $tag = ord($this->serveroutput->body[$this->_parsing->offset]);

        $this->_parsing->offset += 1;
        $j = $this->index;

        $tag = self::_readTag($tag);

        switch ($tag)
        {
            case "begCollection": //RFC3382 (BLIND CODE)
                if ($this->end_collection)
                {
                    $this->index --;
                }
                $this->end_collection = false;
                $this->serveroutput->response[$attributes_type][$j]['type'] = "collection";
                self::_putDebug( "tag is: begCollection\n");
                self::_readAttributeName ($attributes_type,$j);
                if (!$this->serveroutput->response[$attributes_type][$j]['name'])
                { // it is a multi-valued collection
                    $this->collection_depth ++;
                    $this->index --;
                    $this->collection_nbr[$this->collection_depth] ++;
                }
                else
                {
                    $this->collection_depth ++;
                    if ($this->collection_depth == 0)
                    {
                        $this->collection = (object) 'collection';
                    }
                    if (array_key_exists($this->collection_depth,$this->collection_nbr))
                    {
                        $this->collection_nbr[$this->collection_depth] ++;
                    }
                    else
                    {
                        $this->collection_nbr[$this->collection_depth] = 0;
                    }
                    unset($this->end_collection);
                }
                self::_readValue ("begCollection",$attributes_type,$j);
                break;
            case "endCollection": //RFC3382 (BLIND CODE)
                $this->serveroutput->response[$attributes_type][$j]['type'] = "collection";
                self::_putDebug( "tag is: endCollection\n");
                self::_readAttributeName ($attributes_type,$j,0);
                self::_readValue ('name',$attributes_type,$j,0);
                $this->collection_depth --;
                $this->collection_key[$this->collection_depth] = 0;
                $this->end_collection = true;
                break;
            case "memberAttrName": // RFC3382 (BLIND CODE)
                $this->serveroutput->response[$attributes_type][$j]['type'] = "memberAttrName";
                $this->index -- ;
                self::_putDebug( "tag is: memberAttrName\n");
                self::_readCollection ($attributes_type,$j);
                break;

            default:
                $this->collection_depth = -1;
                $this->collection_key = array();
                $this->collection_nbr = array();
                $this->serveroutput->response[$attributes_type][$j]['type'] = $tag;
                self::_putDebug( "tag is: $tag\n");
                $attribute_name = self::_readAttributeName ($attributes_type,$j);
                if (!$attribute_name)
                {
                    $attribute_name = $this->attribute_name;
                }
                else
                {
                    $this->attribute_name = $attribute_name;
                }
                $value = self::_readValue ($tag,$attributes_type,$j);
                $this->serveroutput->response[$attributes_type][$j]['value'] = 
                self::_interpretAttribute($attribute_name,$tag,$this->serveroutput->response[$attributes_type][$j]['value']);
                break;
        }
        return;
    }

    protected function _readTag($tag)
    {
        switch ($tag)
        {
            case 0x10:
                $tag = "unsupported";
                break;
            case 0x11:
                $tag = "reserved for 'default'";
                break;
            case 0x12:
                $tag = "unknown";
                break;
            case 0x13:
                $tag = "no-value";
                break;
            case 0x15: // RFC 3380
                $tag = "not-settable";
                break;
            case 0x16: // RFC 3380
                $tag = "delete-attribute";
                break;
            case 0x17: // RFC 3380
                $tag = "admin-define";
                break;
            case 0x20:
                $tag = "IETF reserved (generic integer)";
                break;
            case 0x21:
                $tag = "integer";
                break;
            case 0x22:
                $tag = "boolean";
                break;
            case 0x23:
                $tag = "enum";
                break;
            case 0x30:
                $tag = "octetString";
                break;
            case 0x31:
                $tag = "datetime";
                break;
            case 0x32:
                $tag = "resolution";
                break;
            case 0x33:
                $tag = "rangeOfInteger";
                break;
            case 0x34: //RFC3382 (BLIND CODE)
                $tag = "begCollection";
                break;
            case 0x35:
                $tag = "textWithLanguage";
                break;
            case 0x36:
                $tag = "nameWithLanguage";
                break;
            case 0x37: //RFC3382 (BLIND CODE)
                $tag = "endCollection";
                break;
            case 0x40:
                $tag = "IETF reserved text string";
                break;
            case 0x41:
                $tag = "textWithoutLanguage";
                break;
            case 0x42:
                $tag = "nameWithoutLanguage";
                break;
            case 0x43:
                $tag = "IETF reserved for future";
                break;
            case 0x44:
                $tag = "keyword";
                break;
            case 0x45:
                $tag = "uri";
                break;
            case 0x46:
                $tag = "uriScheme";
                break;
            case 0x47:
                $tag = "charset";
                break;
            case 0x48:
                $tag = "naturalLanguage";
                break;
            case 0x49:
                $tag = "mimeMediaType";
                break;
            case 0x4A: // RFC3382 (BLIND CODE)
                $tag = "memberAttrName";
                break;
            case 0x7F:
                $tag = "extended type";
                break;
            default:
                if ($tag >= 0x14 && $tag < 0x15 && $tag > 0x17 && $tag <= 0x1f) 
                {
                    $tag = "out-of-band";
                }
                elseif (0x24 <= $tag && $tag <= 0x2f) 
                {
                    $tag = "new integer type";
                }
                elseif (0x38 <= $tag && $tag <= 0x3F) 
                {
                    $tag = "new octet-stream type";
                }
                elseif (0x4B <= $tag && $tag <= 0x5F) 
                {
                    $tag = "new character string type";
                }
                elseif ((0x60 <= $tag && $tag < 0x7f) || $tag >= 0x80 )
                {
                    $tag = "IETF reserved for future";
                }
                else
                {
                    $tag = sprintf("UNKNOWN: 0x%x (%u)",$tag,$tag);
                }
                break;                                                            
        }

        return $tag; 
    }

    protected function _readCollection($attributes_type,$j)
    {
        $name_length = ord($this->serveroutput->body[$this->_parsing->offset]) *  256
                     +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);

        $this->_parsing->offset += 2;

        self::_putDebug( "Collection name_length ". $name_length ."\n");

        $name = '';
        for ($i = 0; $i < $name_length; $i++)
        {
            $name .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
            if ($this->_parsing->offset > strlen($this->serveroutput->body))
            {
                return;
            }
        }

        $collection_name = $name;

        $name_length = ord($this->serveroutput->body[$this->_parsing->offset]) *  256
                     +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);
        $this->_parsing->offset += 2;

        self::_putDebug( "Attribute name_length ". $name_length ."\n");

        $name = '';
        for ($i = 0; $i < $name_length; $i++)
        {
            $name .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
            if ($this->_parsing->offset > strlen($this->serveroutput->body))
            {
                return;
            }
        }

        $attribute_name = $name;
        if ($attribute_name == "")
        {
            $attribute_name = $this->last_attribute_name;
            $this->collection_key[$this->collection_depth] ++;
        }
        else
        {
            $this->collection_key[$this->collection_depth] = 0;
        }
        $this->last_attribute_name = $attribute_name;

        self::_putDebug( "Attribute name ".$name."\n");

        $tag = self::_readTag(ord($this->serveroutput->body[$this->_parsing->offset]));
        $this->_parsing->offset ++;

        $type = $tag;

        $name_length = ord($this->serveroutput->body[$this->_parsing->offset]) *  256
                     +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);
        $this->_parsing->offset += 2;

        self::_putDebug( "Collection2 name_length ". $name_length ."\n");

        $name = '';
        for ($i = 0; $i < $name_length; $i++)
        {
            $name .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
            if ($this->_parsing->offset > strlen($this->serveroutput->body))
            {
                return;
            }
        }

        $collection_value = $name;
        $value_length = ord($this->serveroutput->body[$this->_parsing->offset]) *  256
                      +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);

        self::_putDebug( "Collection value_length ".$this->serveroutput->body[ $this->_parsing->offset]
                                       . $this->serveroutput->body[$this->_parsing->offset + 1]
                                       .": "
                                       . $value_length
                                       . " ");

        $this->_parsing->offset += 2;

        $value = '';
        for ($i = 0; $i < $value_length; $i++)
        {
            if ($this->_parsing->offset >= strlen($this->serveroutput->body))
            {
                return;
            }
            $value .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
        }

        $object = &$this->collection;
        for ($i = 0 ; $i <= $this->collection_depth ; $i ++)
        {
            $indice = "_indice".$this->collection_nbr[$i];
            if (!isset($object->$indice))
            {
                $object->$indice = (object) 'indice';
            }
            $object = &$object->$indice;
        }

        $value_key = "_value".$this->collection_key[$this->collection_depth];
        $col_name_key = "_collection_name".$this->collection_key[$this->collection_depth];
        $col_val_key = "_collection_value".$this->collection_key[$this->collection_depth];

        $attribute_value = self::_interpretAttribute($attribute_name,$tag,$value);
        $attribute_name = str_replace('-','_',$attribute_name);

        self::_putDebug( sprintf("Value: %s\n",$value));
        $object->$attribute_name->_type = $type;
        $object->$attribute_name->$value_key = $attribute_value;
        $object->$attribute_name->$col_name_key = $collection_name;
        $object->$attribute_name->$col_val_key = $collection_value;

        $this->serveroutput->response[$attributes_type][$j]['value'] = $this->collection;
    }

    protected function _readAttributeName ($attributes_type,$j,$write=1)
    {
        $name_length = ord($this->serveroutput->body[ $this->_parsing->offset]) *  256
                     +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);
        $this->_parsing->offset += 2;

        self::_putDebug( "name_length ". $name_length ."\n");

        $name = '';
        for ($i = 0; $i < $name_length; $i++)
        {
            if ($this->_parsing->offset >= strlen($this->serveroutput->body))
            {
                return;
            }
            $name .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
        }

        if($write)
        {
            $this->serveroutput->response[$attributes_type][$j]['name'] = $name;
        }

        self::_putDebug( "name " . $name . "\n");

        return $name;   
    }

    protected function _readValue ($type,$attributes_type,$j,$write=1)
    {
        $value_length = ord($this->serveroutput->body[$this->_parsing->offset]) *  256
                      +  ord($this->serveroutput->body[$this->_parsing->offset + 1]);
        
        self::_putDebug( "value_length ".$this->serveroutput->body[ $this->_parsing->offset]
                                       . $this->serveroutput->body[$this->_parsing->offset + 1]
                                       .": "
                                       . $value_length
                                       . " ");

        $this->_parsing->offset += 2;

        $value = '';
        for ($i = 0; $i < $value_length; $i++)
        {
            if ($this->_parsing->offset >= strlen($this->serveroutput->body))
            {
                return;
            }
            $value .= $this->serveroutput->body[$this->_parsing->offset];
            $this->_parsing->offset += 1;
            }

        self::_putDebug( sprintf("Value: %s\n",$value));

        if ($write)
        {
            $this->serveroutput->response[$attributes_type][$j]['value'] = $value;
        }

        return $value;
    }

    protected function _parseAttributes()
    {
        $k = -1;
        $l = 0;
        for ($i = 0 ; $i < count($this->serveroutput->response) ; $i++)
        {
            for ($j = 0 ; $j < (count($this->serveroutput->response[$i]) - 1) ; $j ++)
            {
                if (!empty($this->serveroutput->response[$i][$j]['name']))
                {
                    $k++;
                    $l = 0;
                    $this->parsed[$k]['range'] = $this->serveroutput->response[$i]['attributes'];
                    $this->parsed[$k]['name'] = $this->serveroutput->response[$i][$j]['name'];
                    $this->parsed[$k]['type'] = $this->serveroutput->response[$i][$j]['type'];
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
                else
                {
                    $l ++;
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
            }
        }
        $this->serveroutput->response = array();
        $this->attributes  = new \stdClass();
        for ($i = 0 ; $i < count($this->parsed) ; $i ++)
        {
                    $name = $this->parsed[$i]['name'];
                    $php_name = str_replace('-','_',$name);
                    $type = $this->parsed[$i]['type'];
                    $range = $this->parsed[$i]['range'];
                    $this->attributes->$php_name = new \stdClass();
                    $this->attributes->$php_name->_type = $type;
                    $this->attributes->$php_name->_range = $range;
                    for ($j = 0 ; $j < (count($this->parsed[$i]) - 3) ; $j ++)
                    {
                        $value = $this->parsed[$i][$j];
                        $index = '_value'.$j;
                        $this->attributes->$php_name->$index = $value;
                        }
                    }

        $this->parsed = array();
    }

    protected function _parseJobAttributes()
    {
        //if (!preg_match('#successful#',$this->serveroutput->status))
        //    return false;
        $k = -1;
        $l = 0;
        for ($i = 0 ; $i < count($this->serveroutput->response) ; $i++)
        {
            for ($j = 0 ; $j < (count($this->serveroutput->response[$i]) - 1) ; $j ++)
            {
                if (!empty($this->serveroutput->response[$i][$j]['name']))
                {
                    $k++;
                    $l = 0;
                    $this->parsed[$k]['range'] = $this->serveroutput->response[$i]['attributes'];
                    $this->parsed[$k]['name'] = $this->serveroutput->response[$i][$j]['name'];
                    $this->parsed[$k]['type'] = $this->serveroutput->response[$i][$j]['type'];
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
                else
                {
                    $l ++;
                    $this->parsed[$k][$l] = $this->serveroutput->response[$i][$j]['value'];
                }
            }
        }

        $this->serveroutput->response = array();

        $this->job_attributes = new \stdClass();
        for ($i = 0 ; $i < count($this->parsed) ; $i ++)
        {
                    $name = $this->parsed[$i]['name'];
                    $php_name = str_replace('-','_',$name);
                    $type = $this->parsed[$i]['type'];
                    $range = $this->parsed[$i]['range'];
                    $this->job_attributes->$php_name = new \stdClass();
                    $this->job_attributes->$php_name->_type = $type;
                    $this->job_attributes->$php_name->_range = $range;
                    for ($j = 0 ; $j < (count($this->parsed[$i]) - 3) ; $j ++)
                    {
                        $value = $this->parsed[$i][$j];
                        $index = '_value'.$j;
                        $this->job_attributes->$php_name->$index = $value;
                        }
                    }

        $this->parsed = array();
    }

    protected function _interpretAttribute($attribute_name,$type,$value)
    {
        switch ($type)
        {
            case "integer":
                $value = self::_interpretInteger($value);
                break;
            case "rangeOfInteger":
                $value = self::_interpretRangeOfInteger($value);
                break;
            case 'boolean':
                $value = ord($value);
                if ($value == 0x00)
                {
                    $value = 'false';
                }
                else
                {
                    $value = 'true';
                }
                break;
            case 'datetime':
                $value = self::_interpretDateTime($value);
                break;
            case 'enum':
                $value = $this->_interpretEnum($attribute_name,$value); // must be overwritten by children
                break;
            case 'resolution':
                $unit = $value[8];
                $value = self::_interpretRangeOfInteger(substr($value,0,8));
                switch($unit)
                {
                    case chr(0x03):
                        $unit = "dpi";
                        break;
                    case chr(0x04):
                        $unit = "dpc";
                        break;
                    }
                $value = $value." ".$unit;
                break;
            default:
                break;
        }
        return $value;
    }

    protected function _interpretRangeOfInteger($value)
    {
        $value_parsed = 0;
        $integer1 = $integer2 = 0;

        $halfsize = strlen($value) / 2;

        $integer1 = self::_interpretInteger(substr($value,0,$halfsize));
        $integer2 = self::_interpretInteger(substr($value,$halfsize,$halfsize));

        $value_parsed = sprintf('%s-%s',$integer1,$integer2);

        return $value_parsed;
    }

    protected function _interpretDateTime($date)
    {
        $year = self::_interpretInteger(substr($date,0,2));
        $month =  self::_interpretInteger(substr($date,2,1));
        $day =  self::_interpretInteger(substr($date,3,1));
        $hour =  self::_interpretInteger(substr($date,4,1));
        $minute =  self::_interpretInteger(substr($date,5,1));
        $second =  self::_interpretInteger(substr($date,6,1));
        $direction = substr($date,8,1);
        $hours_from_utc = self::_interpretInteger(substr($date,9,1));
        $minutes_from_utc = self::_interpretInteger(substr($date,10,1));

        $date = sprintf('%s-%s-%s %s:%s:%s %s%s:%s',$year,$month,$day,$hour,$minute,$second,$direction,$hours_from_utc,$minutes_from_utc);

        return $date;
    }

    protected function _interpretEnum($attribute_name,$value)
    {
        $value_parsed = self::_interpretInteger($value);

        switch ($attribute_name)
        {
            case 'job-state':
                switch ($value_parsed)
                {
                    case 0x03:
                        $value = 'pending';
                        break;
                    case 0x04:
                        $value = 'pending-held';
                        break;
                    case 0x05:
                        $value = 'processing';
                        break;
                    case 0x06:
                        $value = 'processing-stopped';
                        break;
                    case 0x07:
                        $value = 'canceled';
                        break;
                    case 0x08:
                        $value = 'aborted';
                        break;
                    case 0x09:
                        $value = 'completed';
                        break;
                }
                if ($value_parsed > 0x09)
                {
                    $value = sprintf('Unknown(IETF standards track "job-state" reserved): 0x%x',$value_parsed);
                }
                break;
            case 'print-quality':
            case 'print-quality-supported':
            case 'print-quality-default':
                switch ($value_parsed)
                {
                    case 0x03:
                        $value = 'draft';
                        break;
                    case 0x04:
                        $value = 'normal';
                        break;
                    case 0x05:
                        $value = 'high';
                        break;
                    }
                break;
            case 'printer-state':
                switch ($value_parsed)
                {
                    case 0x03:
                        $value = 'idle';
                        break;
                    case 0x04:
                        $value = 'processing';
                        break;
                    case 0x05:
                        $value = 'stopped';
                        break;
                }
                if ($value_parsed > 0x05)
                {
                    $value = sprintf('Unknown(IETF standards track "printer-state" reserved): 0x%x',$value_parsed);
                }
                break;

            case 'operations-supported':
                switch($value_parsed)
                {
                    case 0x0000:
                    case 0x0001:
                        $value = sprintf('Unknown(reserved) : %s',ord($value));
                        break;
                    case 0x0002:
                        $value = 'Print-Job';
                        break;
                    case 0x0003:
                        $value = 'Print-URI';
                        break;
                    case 0x0004:
                        $value = 'Validate-Job';
                        break;
                    case 0x0005:
                        $value = 'Create-Job';
                        break;
                    case 0x0006:
                        $value = 'Send-Document';
                        break;
                    case 0x0007:
                        $value = 'Send-URI';
                        break;
                    case 0x0008:
                        $value = 'Cancel-Job';
                        break;
                    case 0x0009:
                        $value = 'Get-Job-Attributes';
                        break;
                    case 0x000A:
                        $value = 'Get-Jobs';
                        break;
                    case 0x000B:
                        $value = 'Get-Printer-Attributes';
                        break;
                    case 0x000C:
                        $value = 'Hold-Job';
                        break;
                    case 0x000D:
                        $value = 'Release-Job';
                        break;
                    case 0x000E:
                        $value = 'Restart-Job';
                        break;
                    case 0x000F:
                        $value = 'Unknown(reserved for a future operation)';
                        break;
                    case 0x0010:
                        $value = 'Pause-Printer';
                        break;
                    case 0x0011:
                        $value = 'Resume-Printer';
                        break;
                    case 0x0012:
                        $value = 'Purge-Jobs';
                        break;
                    case 0x0013:
                        $value = 'Set-Printer-Attributes'; // RFC3380
                        break;
                    case 0x0014:
                        $value = 'Set-Job-Attributes'; // RFC3380
                        break;
                    case 0x0015:
                        $value = 'Get-Printer-Supported-Values'; // RFC3380
                        break;
                    case 0x0016:
                        $value = 'Create-Printer-Subscriptions';
                        break;
                    case 0x0017:
                        $value = 'Create-Job-Subscriptions';
                        break;
                    case 0x0018:
                        $value = 'Get-Subscription-Attributes';
                        break;
                    case 0x0019:
                        $value = 'Get-Subscriptions';
                        break;
                    case 0x001A:
                        $value = 'Renew-Subscription';
                        break;
                    case 0x001B:
                        $value = 'Cancel-Subscription';
                        break;
                    case 0x001C:
                        $value = 'Get-Notifications';
                        break;
                    case 0x001D:
                        $value = sprintf('Unknown (reserved IETF "operations"): 0x%x',ord($value));
                        break;
                    case 0x001E:
                        $value = sprintf('Unknown (reserved IETF "operations"): 0x%x',ord($value));
                        break;
                    case 0x001F:
                        $value = sprintf('Unknown (reserved IETF "operations"): 0x%x',ord($value));
                        break;
                    case 0x0020:
                        $value = sprintf('Unknown (reserved IETF "operations"): 0x%x',ord($value));
                        break;
                    case 0x0021:
                        $value = sprintf('Unknown (reserved IETF "operations"): 0x%x',ord($value));
                        break;
                    case 0x0022: 
                        $value = 'Enable-Printer';
                        break;
                    case 0x0023: 
                        $value = 'Disable-Printer';
                        break;
                    case 0x0024: 
                        $value = 'Pause-Printer-After-Current-Job';
                        break;
                    case 0x0025: 
                        $value = 'Hold-New-Jobs';
                        break;
                    case 0x0026: 
                        $value = 'Release-Held-New-Jobs';
                        break;
                    case 0x0027: 
                        $value = 'Deactivate-Printer';
                        break;
                    case 0x0028: 
                        $value = 'Activate-Printer';
                        break;
                    case 0x0029: 
                        $value = 'Restart-Printer';
                        break;
                    case 0x002A: 
                        $value = 'Shutdown-Printer';
                        break;
                    case 0x002B: 
                        $value = 'Startup-Printer';
                        break;
                }
                if ($value_parsed > 0x002B && $value_parsed <= 0x3FFF)
                {
                    $value = sprintf('Unknown(IETF standards track operations reserved): 0x%x',$value_parsed);
                }
                elseif ($value_parsed >= 0x4000 && $value_parsed <= 0x8FFF)
                {
                    if (method_exists($this,'_getEnumVendorExtensions'))
                    {
                        $value = $this->_getEnumVendorExtensions($value_parsed);
                    }
                    else
                    {
                        $value = sprintf('Unknown(Vendor extension for operations): 0x%x',$value_parsed);
                    }
                }
                elseif ($value_parsed > 0x8FFF)
                {
                    $value = sprintf('Unknown operation (should not exists): 0x%x',$value_parsed);
                }

                break;
            case 'finishings':
            case 'finishings-default':
            case 'finishings-supported':
                switch ($value_parsed)
                {
                    case 3:
                        $value = 'none';
                        break;
                    case 4:
                        $value = 'staple';
                        break;
                    case 5:
                        $value = 'punch';
                        break;
                    case 6:
                        $value = 'cover';
                        break;
                    case 7:
                        $value = 'bind';
                        break;
                    case 8:
                        $value = 'saddle-stitch';
                        break;
                    case 9:
                        $value = 'edge-stitch';
                        break;
                    case 20:
                        $value = 'staple-top-left';
                        break;
                    case 21:
                        $value = 'staple-bottom-left';
                        break;
                    case 22:
                        $value = 'staple-top-right';
                        break;
                    case 23:
                        $value = 'staple-bottom-right';
                        break;
                    case 24:
                        $value = 'edge-stitch-left';
                        break;
                    case 25:
                        $value = 'edge-stitch-top';
                        break;
                    case 26:
                        $value = 'edge-stitch-right';
                        break;
                    case 27:
                        $value = 'edge-stitch-bottom';
                        break;
                    case 28:
                        $value = 'staple-dual-left';
                        break;
                    case 29:
                        $value = 'staple-dual-top';
                        break;
                    case 30:
                        $value = 'staple-dual-right';
                        break;
                    case 31:
                        $value = 'staple-dual-bottom';
                        break;
                }
                if ($value_parsed > 31)
                {
                    $value = sprintf('Unknown(IETF standards track "finishing" reserved): 0x%x',$value_parsed);
                }
                break;

            case 'orientation-requested':
            case 'orientation-requested-supported':
            case 'orientation-requested-default':
                switch ($value_parsed)
                {
                    case 0x03:
                        $value = 'portrait';
                        break;
                    case 0x04:
                        $value = 'landscape';
                        break;
                    case 0x05:
                        $value = 'reverse-landscape';
                        break;
                    case 0x06:
                        $value = 'reverse-portrait';
                        break;
                }
                if ($value_parsed > 0x06)
                {
                    $value = sprintf('Unknown(IETF standards track "orientation" reserved): 0x%x',$value_parsed);
                }
                break;

            default:
                break;
        }
        return $value;
    }

    protected function _getJobId ()
    {
        if (!isset($this->serveroutput->response))
        {
            $this->jobs = array_merge($this->jobs,array('NO JOB'));
        }

        $jobfinded = false;
        for ($i = 0 ; (!$jobfinded && array_key_exists($i,$this->serveroutput->response)) ; $i ++)
        {
            if (($this->serveroutput->response[$i]['attributes']) == "job-attributes")
            {
                for ($j = 0 ; array_key_exists($j,$this->serveroutput->response[$i]) ; $j++)
                {
                    if ($this->serveroutput->response[$i][$j]['name'] == "job-id")
                    {
                        $this->last_job = $this->serveroutput->response[$i][$j]['value'];
                        $this->jobs = array_merge($this->jobs,array($this->serveroutput->response[$i][$j]['value']));
                        return;
                    }
                }
            }
        }
    }

    protected function _getJobUri ()
    {
        if (!isset($this->jobs_uri))
        {
            $this->jobs_uri = array();
        }

        $jobfinded = false;
        for ($i = 0 ; (!$jobfinded && array_key_exists($i,$this->serveroutput->response)) ; $i ++)
        {
            if (($this->serveroutput->response[$i]['attributes']) == "job-attributes")
            {
                for ($j = 0 ; array_key_exists($j,$this->serveroutput->response[$i]) ; $j++)
                {
                    if ($this->serveroutput->response[$i][$j]['name'] == "job-uri")
                    {
                        $this->last_job = $this->serveroutput->response[$i][$j]['value'];
                        $this->jobs_uri = array_merge($this->jobs_uri,array($this->last_job));
                        return;
                    }
                }
            }
        }
        $this->last_job = '';
    }

    protected function _parseResponse ()
   {
        $j = -1;
        $this->index = 0;
        for ($i = $this->_parsing->offset; $i < strlen($this->serveroutput->body) ; $i = $this->_parsing->offset)
        {
            $tag = ord($this->serveroutput->body[$this->_parsing->offset]);

            if ($tag > 0x0F)
            {
                self::_readAttribute($j);
                $this->index ++;
                continue;
            }

            switch ($tag)
            {
                case 0x01:
                    $j += 1;
                    $this->serveroutput->response[$j]['attributes'] = "operation-attributes";
                    $this->index = 0;
                    $this->_parsing->offset += 1;
                    break;
                case 0x02:
                    $j += 1;
                    $this->serveroutput->response[$j]['attributes'] = "job-attributes";
                    $this->index = 0;
                    $this->_parsing->offset += 1;
                    break;
                case 0x03:
                    $j +=1;
                    $this->serveroutput->response[$j]['attributes'] = "end-of-attributes";
                    self::_putDebug( "tag is: ".$this->serveroutput->response[$j]['attributes']."\n");
                    if ($this->alert_on_end_tag === 1)
                    {
                        echo "END tag OK<br />";
                    }
                    $this->response_completed[(count($this->response_completed) -1)] = "completed";
                    return;
                case 0x04:
                    $j += 1;
                    $this->serveroutput->response[$j]['attributes'] = "printer-attributes";
                    $this->index = 0;
                    $this->_parsing->offset += 1;
                    break;
                case 0x05:
                    $j += 1;
                    $this->serveroutput->response[$j]['attributes'] = "unsupported-attributes";
                    $this->index = 0;
                    $this->_parsing->offset += 1;
                    break;
                default:
                    $j += 1;
                    $this->serveroutput->response[$j]['attributes'] = sprintf(_("0x%x (%u) : attributes tag Unknown (reserved for future versions of IPP"),$tag,$tag);
                    $this->index = 0;
                    $this->_parsing->offset += 1;
                    break;
            }

            self::_putDebug( "tag is: ".$this->serveroutput->response[$j]['attributes']."\n\n\n");
        }
        return;
    }

    /*
    // NOTICE : HAVE TO READ AGAIN RFC 2911 TO SEE IF IT IS PART OF SERVER'S RESPONSE (CUPS DO NOT)

    protected function _getPrinterUri () {

        for ($i = 0 ; (array_key_exists($i,$this->serveroutput->response)) ; $i ++)
            if (($this->serveroutput->response[$i]['attributes']) == "job-attributes")
                for ($j = 0 ; array_key_exists($j,$this->serveroutput->response[$i]) ; $j++)
                    if ($this->serveroutput->response[$i][$j]['name'] == "printer-uri") {
                        $this->printers_uri = array_merge($this->printers_uri,array($this->serveroutput->response[$i][$j]['value']));

                        return;
                        
                        }

        $this->printers_uri = array_merge($this->printers_uri,array(''));
 
    }

    */

    // REQUEST BUILDING
    protected function _stringCancel ($job_uri)
    {
    
        if (!isset($this->setup->charset))
        {
            self::setCharset();
        }
        if (!isset($this->setup->datatype))
        {
            self::setBinary();
        }
        if (!isset($this->setup->language))
        {
            self::setLanguage('en_us');
        }
        if (!$this->requesting_user)   
        {
            self::setUserName();
        }
        if (!isset($this->meta->message))
        {
            $this->meta->message = '';
        }

        self::_setOperationId();

        self::_setJobUri($job_uri);

        if (!isset($this->error_generation->request_body_malformed))
        {
            $this->error_generation->request_body_malformed = "";
        }

        $this->stringjob = chr(0x01) . chr(0x01) // 1.1  | version-number
                         . chr(0x00) . chr (0x08) // cancel-Job | operation-id
                         . $this->meta->operation_id //           request-id
                         . $this->error_generation->request_body_malformed
                         . chr(0x01) // start operation-attributes | operation-attributes-tag
                         . $this->meta->charset
                         . $this->meta->language
                         . $this->meta->job_uri
                         . $this->meta->username
                         . $this->meta->message
                         . chr(0x03); // end-of-attributes | end-of-attributes-tag
                         
        self::_putDebug( sprintf(_("String sent to the server is:\n%s\n"), $this->stringjob));
        return TRUE;
    }
}