<?php
  /**
   * Cpdf
   *
   * http://www.ros.co.nz/pdf
   *
   * A PHP class to provide the basic functionality to create a pdf document without
   * any requirement for additional modules.
   *
   * Note that they companion class CezPdf can be used to extend this class and dramatically
   * simplify the creation of documents.
   *
   * Extended by Orion Richardson to support Unicode / UTF-8 characters using
   * TCPDF and others as a guide.
   *
   * IMPORTANT NOTE
   * there is no warranty, implied or otherwise with this software.
   *
   * LICENCE
   * This code has been placed in the Public Domain for all to enjoy.
   *
   * @author       Wayne Munro <pdf@ros.co.nz>
   * @contributor  Orion Richardson <orionr@yahoo.com>
   * @contributor  Helmut Tischer <htischer@weihenstephan.org>
   * @version  009
   * @package  Cpdf
   *
   * Changes
   * @contributor Helmut Tischer <htischer@weihenstephan.org>
   * @version 0.5.1.htischer.20090507
   * - On multiple identical png and jpg images, put only one copy into the pdf file and refer to it.
   *   This reduces file size and rendering time.
   * - Allow font metrics cache to be a different folder as the font metrics. This allows a read only installation.
   * - Allow adding images directly from a gd object. This increases performance by avoiding temporary files.
   * - On png image files remove alpa channel to allow display of typical png files in pdf.
   * - On addImage avoid temporary file. Todo: Duplicate Image (currently not used)
   * - Add a check function, whether image is already cached, This avoids double creation by caller which saves
   *   CPU time and memory.
   * @contributor Helmut Tischer <htischer@weihenstephan.org>
   * @version dompdf_trunk_with_helmut_mods.20090524
   * - Allow temp and fontcache folders to be passed in by class creator
   * @version dompdf_trunk_with_helmut_mods.20090528
   * - typo 'decent' instead of 'descent' at various locations made getFontDescender worthless
   */
class  Cpdf {


  /**
   * the current number of pdf objects in the document
   */
  public  $numObj = 0;

  /**
   * this array contains all of the pdf objects, ready for final assembly
   */
  public  $objects =  array();

  /**
   * the objectId (number within the objects array) of the document catalog
   */
  public  $catalogId;

  /**
   * array carrying information about the fonts that the system currently knows about
   * used to ensure that a font is not loaded twice, among other things
   */
  public  $fonts = array();

  /**
   * a record of the current font
   */
  public  $currentFont = '';

  /**
   * the current base font
   */
  public  $currentBaseFont = '';

  /**
   * the number of the current font within the font array
   */
  public  $currentFontNum = 0;

  /**
   *
   */
  public  $currentNode;

  /**
   * object number of the current page
   */
  public  $currentPage;

  /**
   * object number of the currently active contents block
   */
  public  $currentContents;

  /**
   * number of fonts within the system
   */
  public  $numFonts = 0;

  /**
   * Number of graphic state resources used
   */
  private  $numStates =  0;


  /**
   * current colour for fill operations, defaults to inactive value, all three components should be between 0 and 1 inclusive when active
   */
  public  $currentColour = array('r'=>-1, 'g'=>-1, 'b'=>-1);

  /**
   * current colour for stroke operations (lines etc.)
   */
  public  $currentStrokeColour = array('r'=>-1, 'g'=>-1, 'b'=>-1);

  /**
   * current style that lines are drawn in
   */
  public  $currentLineStyle = '';

  /**
   * current line transparency (partial graphics state)
   */
  public $currentLineTransparency = array("mode" => "Normal", "opacity" => 1.0);
  
  /**
   * current fill transparency (partial graphics state)
   */
  public $currentFillTransparency = array("mode" => "Normal", "opacity" => 1.0);
  
  /**
   * an array which is used to save the state of the document, mainly the colours and styles
   * it is used to temporarily change to another state, the change back to what it was before
   */
  public  $stateStack =  array();

  /**
   * number of elements within the state stack
   */
  public  $nStateStack =  0;

  /**
   * number of page objects within the document
   */
  public  $numPages = 0;

  /**
   * object Id storage stack
   */
  public  $stack = array();

  /**
   * number of elements within the object Id storage stack
   */
  public  $nStack = 0;

  /**
   * an array which contains information about the objects which are not firmly attached to pages
   * these have been added with the addObject function
   */
  public  $looseObjects = array();

  /**
   * array contains infomation about how the loose objects are to be added to the document
   */
  public  $addLooseObjects = array();

  /**
   * the objectId of the information object for the document
   * this contains authorship, title etc.
   */
  public  $infoObject = 0;

  /**
   * number of images being tracked within the document
   */
  public  $numImages = 0;

  /**
   * an array containing options about the document
   * it defaults to turning on the compression of the objects
   */
  public  $options = array('compression'=>1);

  /**
   * the objectId of the first page of the document
   */
  public  $firstPageId;

  /**
   * used to track the last used value of the inter-word spacing, this is so that it is known
   * when the spacing is changed.
   */
  public  $wordSpaceAdjust = 0;

  /**
   * the object Id of the procset object
   */
  public  $procsetObjectId;

  /**
   * store the information about the relationship between font families
   * this used so that the code knows which font is the bold version of another font, etc.
   * the value of this array is initialised in the constuctor function.
   */
  public  $fontFamilies =  array();
 
  /**
   * folder for php serialized formats of font metrics files.
   * If empty string, use same folder as original metrics files.
   * This can be passed in from class creator.
   * If this folder does not exist or is not writable, Cpdf will be **much** slower.
   * Because of potential trouble with php safe mode, folder cannot be created at runtime.
   */
  public  $fontcache = '';
  
  /**
   * temporary folder.
   * If empty string, will attempty system tmp folder.
   * This can be passed in from class creator.
   * Only used for conversion of gd images to jpeg images.
   */
  public  $tmp = '';

  /**
   * track if the current font is bolded or italicised
   */
  public  $currentTextState =  '';

  /**
   * messages are stored here during processing, these can be selected afterwards to give some useful debug information
   */
  public  $messages = '';

  /**
   * the ancryption array for the document encryption is stored here
   */
  public  $arc4 = '';

  /**
   * the object Id of the encryption information
   */
  public  $arc4_objnum = 0;

  /**
   * the file identifier, used to uniquely identify a pdf document
   */
  public  $fileIdentifier = '';

  /**
   * a flag to say if a document is to be encrypted or not
   */
  public  $encrypted = 0;

  /**
   * the ancryption key for the encryption of all the document content (structure is not encrypted)
   */
  public  $encryptionKey = '';

  /**
   * array which forms a stack to keep track of nested callback functions
   */
  public  $callback =  array();

  /**
   * the number of callback functions in the callback array
   */
  public  $nCallback =  0;

  /**
   * store label->id pairs for named destinations, these will be used to replace internal links
   * done this way so that destinations can be defined after the location that links to them
   */
  public  $destinations =  array();

  /**
   * store the stack for the transaction commands, each item in here is a record of the values of all the
   * publiciables within the class, so that the user can rollback at will (from each 'start' command)
   * note that this includes the objects array, so these can be large.
   */
  public  $checkpoint =  '';

  /* Table of Image origin filenames and image labels which were already added with o_image().
   * Allows to merge identical images
   */
  public  $imagelist = array();

  /**
   * whether the text passed in should be treated as Unicode or just local character set.
   */
  public  $isUnicode = false;

  /**
   * class constructor
   * this will start a new document
   * @var array array of 4 numbers, defining the bottom left and upper right corner of the page. first two are normally zero.
   * @var boolean whether text will be treated as Unicode or not.
   */
  function  Cpdf ($pageSize = array(0, 0, 612, 792), $isUnicode = false, $fontcache = '', $tmp = '') {

    $this->isUnicode = $isUnicode;

    $this->fontcache = $fontcache;

    $this->tmp = $tmp;

    $this->newDocument($pageSize);


    // also initialize the font families that are known about already
    $this->setFontFamily('init');

    //  $this->fileIdentifier = md5('xxxxxxxx'.time());


  }


  /**
   * Document object methods (internal use only)
   *
   * There is about one object method for each type of object in the pdf document
   * Each function has the same call list ($id,$action,$options).
   * $id = the object ID of the object, or what it is to be if it is being created
   * $action = a string specifying the action to be performed, though ALL must support:
   *           'new' - create the object with the id $id
   *           'out' - produce the output for the pdf object
   * $options = optional, a string or array containing the various parameters for the object
   *
   * These, in conjunction with the output function are the ONLY way for output to be produced
   * within the pdf 'file'.
   */

  /**
   *destination object, used to specify the location for the user to jump to, presently on opening
   */
  function  o_destination($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'destination', 'info'=>array());

      $tmp =  '';

      switch  ($options['type']) {

      case  'XYZ':

      case  'FitR':

        $tmp =   ' '.$options['p3'].$tmp;

      case  'FitH':

      case  'FitV':

      case  'FitBH':

      case  'FitBV':

        $tmp =   ' '.$options['p1'].' '.$options['p2'].$tmp;

      case  'Fit':

      case  'FitB':

        $tmp =   $options['type'].$tmp;

        $this->objects[$id]['info']['string'] = $tmp;

        $this->objects[$id]['info']['page'] = $options['page'];
      }

      break;

    case  'out':

      $tmp =  $o['info'];

      $res = "\n".$id." 0 obj\n".'['.$tmp['page'].' 0 R /'.$tmp['string']."]\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * set the viewer preferences
   */
  function  o_viewerPreferences($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'viewerPreferences', 'info'=>array());

      break;

    case  'add':

      foreach($options as  $k=>$v) {

        switch  ($k) {

        case  'HideToolbar':

        case  'HideMenubar':

        case  'HideWindowUI':

        case  'FitWindow':

        case  'CenterWindow':

        case  'NonFullScreenPageMode':

        case  'Direction':

          $o['info'][$k] = $v;

          break;
        }
      }

      break;

    case  'out':


      $res = "\n".$id." 0 obj\n".'<< ';

      foreach($o['info'] as  $k=>$v) {

        $res.= "\n/".$k.' '.$v;
      }

      $res.= "\n>>\n";

      return  $res;

      break;
    }
  }


  /**
   * define the document catalog, the overall controller for the document
   */
  function  o_catalog($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'catalog', 'info'=>array());

      $this->catalogId = $id;

      break;

    case  'outlines':

    case  'pages':

    case  'openHere':

      $o['info'][$action] = $options;

      break;

    case  'viewerPreferences':

      if  (!isset($o['info']['viewerPreferences'])) {

        $this->numObj++;

        $this->o_viewerPreferences($this->numObj, 'new');

        $o['info']['viewerPreferences'] = $this->numObj;
      }

      $vp =  $o['info']['viewerPreferences'];

      $this->o_viewerPreferences($vp, 'add', $options);

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n".'<< /Type /Catalog';

      foreach($o['info'] as  $k=>$v) {

        switch ($k) {

        case  'outlines':

          $res.= "\n".'/Outlines '.$v.' 0 R';

          break;

        case  'pages':

          $res.= "\n".'/Pages '.$v.' 0 R';

          break;

        case  'viewerPreferences':

          $res.= "\n".'/ViewerPreferences '.$o['info']['viewerPreferences'].' 0 R';

          break;

        case  'openHere':

          $res.= "\n".'/OpenAction '.$o['info']['openHere'].' 0 R';

          break;
        }
      }

      $res.= " >>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * object which is a parent to the pages in the document
   */
  function  o_pages($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'pages', 'info'=>array());

      $this->o_catalog($this->catalogId, 'pages', $id);

      break;

    case  'page':

      if  (!is_array($options)) {

        // then it will just be the id of the new page
        $o['info']['pages'][] = $options;
      } else {

        // then it should be an array having 'id','rid','pos', where rid=the page to which this one will be placed relative
        // and pos is either 'before' or 'after', saying where this page will fit.
        if  (isset($options['id']) &&  isset($options['rid']) &&  isset($options['pos'])) {

          $i =  array_search($options['rid'], $o['info']['pages']);

          if  (isset($o['info']['pages'][$i]) &&  $o['info']['pages'][$i] == $options['rid']) {

            // then there is a match
            // make a space
            switch  ($options['pos']) {

            case  'before':

              $k =  $i;

              break;

            case  'after':

              $k = $i+1;

              break;

            default:

              $k = -1;

              break;
            }

            if  ($k >= 0) {

              for  ($j = count($o['info']['pages']) -1;$j >= $k;$j--) {

                $o['info']['pages'][$j+1] = $o['info']['pages'][$j];
              }

              $o['info']['pages'][$k] = $options['id'];
            }
          }
        }
      }

      break;

    case  'procset':

      $o['info']['procset'] = $options;

      break;

    case  'mediaBox':

      $o['info']['mediaBox'] = $options;
      // which should be an array of 4 numbers
      break;

    case  'font':

      $o['info']['fonts'][] = array('objNum'=>$options['objNum'], 'fontNum'=>$options['fontNum']);

      break;


    case  'extGState':

      $o['info']['extGStates'][] =  array('objNum' => $options['objNum'],  'stateNum' => $options['stateNum']);

      break;


    case  'xObject':

      $o['info']['xObjects'][] = array('objNum'=>$options['objNum'], 'label'=>$options['label']);

      break;

    case  'out':

      if  (count($o['info']['pages'])) {

        $res = "\n".$id." 0 obj\n<< /Type /Pages\n/Kids [";

        foreach($o['info']['pages'] as  $k=>$v) {

          $res.= $v." 0 R\n";
        }

        $res.= "]\n/Count ".count($this->objects[$id]['info']['pages']);


        if  ( (isset($o['info']['fonts']) &&  count($o['info']['fonts'])) ||
              isset($o['info']['procset']) ||
              (isset($o['info']['extGStates']) &&  count($o['info']['extGStates']))) {


          $res.= "\n/Resources <<";

          if  (isset($o['info']['procset'])) {

            $res.= "\n/ProcSet ".$o['info']['procset']." 0 R";
          }

          if  (isset($o['info']['fonts']) &&  count($o['info']['fonts'])) {

            $res.= "\n/Font << ";

            foreach($o['info']['fonts'] as  $finfo) {

              $res.= "\n/F".$finfo['fontNum']." ".$finfo['objNum']." 0 R";
            }

            $res.= "\n>>";
          }

          if  (isset($o['info']['xObjects']) &&  count($o['info']['xObjects'])) {

            $res.= "\n/XObject << ";

            foreach($o['info']['xObjects'] as  $finfo) {

              $res.= "\n/".$finfo['label']." ".$finfo['objNum']." 0 R";
            }

            $res.= "\n>>";
          }

          if  ( isset($o['info']['extGStates']) &&  count($o['info']['extGStates'])) {

            $res.=  "\n/ExtGState << ";

            foreach ($o['info']['extGStates'] as  $gstate) {

              $res.=  "\n/GS" . $gstate['stateNum'] . " " . $gstate['objNum'] . " 0 R";
            }

            $res.=  "\n>>";
          }


          $res.= "\n>>";

          if  (isset($o['info']['mediaBox'])) {

            $tmp = $o['info']['mediaBox'];

            $res.= "\n/MediaBox [".sprintf('%.3F', $tmp[0]) .' '.sprintf('%.3F', $tmp[1]) .' '.sprintf('%.3F', $tmp[2]) .' '.sprintf('%.3F', $tmp[3]) .']';
          }
        }

        $res.= "\n >>\nendobj";
      } else {

        $res = "\n".$id." 0 obj\n<< /Type /Pages\n/Count 0\n>>\nendobj";
      }

      return  $res;

      break;
    }
  }


  /**
   * define the outlines in the doc, empty for now
   */
  function  o_outlines($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'outlines', 'info'=>array('outlines'=>array()));

      $this->o_catalog($this->catalogId, 'outlines', $id);

      break;

    case  'outline':

      $o['info']['outlines'][] = $options;

      break;

    case  'out':

      if  (count($o['info']['outlines'])) {

        $res = "\n".$id." 0 obj\n<< /Type /Outlines /Kids [";

        foreach($o['info']['outlines'] as  $k=>$v) {

          $res.= $v." 0 R ";
        }

        $res.= "] /Count ".count($o['info']['outlines']) ." >>\nendobj";
      } else {

        $res = "\n".$id." 0 obj\n<< /Type /Outlines /Count 0 >>\nendobj";
      }

      return  $res;

      break;
    }
  }


  /**
   * an object to hold the font description
   */
  function  o_font($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] =  array('t' => 'font', 'info' => array('name' => $options['name'], 'fontFileName' => $options['fontFileName'], 'SubType' => 'Type1'));

      $fontNum =  $this->numFonts;

      $this->objects[$id]['info']['fontNum'] =  $fontNum;

      // deal with the encoding and the differences
      if  (isset($options['differences'])) {

        // then we'll need an encoding dictionary
        $this->numObj++;

        $this->o_fontEncoding($this->numObj, 'new', $options);

        $this->objects[$id]['info']['encodingDictionary'] =  $this->numObj;
      } else  if  (isset($options['encoding'])) {

        // we can specify encoding here
        switch ($options['encoding']) {

        case  'WinAnsiEncoding':

        case  'MacRomanEncoding':

        case  'MacExpertEncoding':

          $this->objects[$id]['info']['encoding'] =  $options['encoding'];

          break;

        case  'none':

          break;

        default:

          $this->objects[$id]['info']['encoding'] =  'WinAnsiEncoding';

          break;
        }
      } else {

        $this->objects[$id]['info']['encoding'] =  'WinAnsiEncoding';
      }

      if ($this->isUnicode) {

        // For Unicode fonts, we need to incorporate font data into
        // sub-sections that are linked from the primary font section.
        // Look at o_fontGIDtoCID and o_fontDescendentCID functions
        // for more informaiton.
        //
        // All of this code is adapted from the excellent changes made to
        // transform FPDF to TCPDF (http://tcpdf.sourceforge.net/)

        $toUnicodeId = ++$this->numObj;
        $this->o_contents($toUnicodeId, 'new', 'raw');
        $this->objects[$id]['info']['toUnicode'] = $toUnicodeId;
        
        $stream =  "/CIDInit /ProcSet findresource begin\n";
        $stream.=  "12 dict begin\n";
        $stream.=  "begincmap\n";
        $stream.=  "/CIDSystemInfo\n";
        $stream.=  "<</Registry (Adobe)\n";
        $stream.=  "/Ordering (UCS)\n";
        $stream.=  "/Supplement 0\n";
        $stream.=  ">> def\n";
        $stream.=  "/CMapName /Adobe-Identity-UCS def\n";
        $stream.=  "/CMapType 2 def\n";
        $stream.=  "1 begincodespacerange\n";
        $stream.=  "<0000> <FFFF>\n";
        $stream.=  "endcodespacerange\n";
        $stream.=  "1 beginbfrange\n";
        $stream.=  "<0000> <FFFF> <0000>\n";
        $stream.=  "endbfrange\n";
        $stream.=  "endcmap\n";
        $stream.=  "CMapName currentdict /CMap defineresource pop\n";
        $stream.=  "end\n";
        $stream.=  "end\n";

        $res =   "<</Length " . mb_strlen($stream) . " >>\n";
        $res .=  "stream\n" . $stream . "endstream";

        $this->objects[$toUnicodeId]['c'] = $res;

        $cidFontId = ++$this->numObj;
        $this->o_fontDescendentCID($cidFontId, 'new', $options);
        $this->objects[$id]['info']['cidFont'] = $cidFontId;
      }
      
      // also tell the pages node about the new font
      $this->o_pages($this->currentNode, 'font', array('fontNum' => $fontNum, 'objNum' => $id));

      break;


    case  'add':

      foreach ($options as  $k => $v) {

        switch  ($k) {

        case  'BaseFont':

          $o['info']['name'] =  $v;

          break;

        case  'FirstChar':

        case  'LastChar':

        case  'Widths':

        case  'FontDescriptor':

        case  'SubType':

          $this->addMessage('o_font '.$k." : ".$v);

          $o['info'][$k] =  $v;

          break;
        }
      }

      // pass values down to descendent font
      if (isset($o['info']['cidFont'])) {

        $this->o_fontDescendentCID($o['info']['cidFont'], 'add', $options);
      }
        
      break;


    case  'out':

      if ($this->isUnicode) {

        // For Unicode fonts, we need to incorporate font data into
        // sub-sections that are linked from the primary font section.
        // Look at o_fontGIDtoCID and o_fontDescendentCID functions
        // for more informaiton.
        //
        // All of this code is adapted from the excellent changes made to
        // transform FPDF to TCPDF (http://tcpdf.sourceforge.net/)

        $res =  "\n".$id." 0 obj\n<</Type /Font\n/Subtype /Type0\n";
        $res.=  "/BaseFont /".$o['info']['name']."\n";

        // The horizontal identity mapping for 2-byte CIDs; may be used
        // with CIDFonts using any Registry, Ordering, and Supplement values.
        $res.=  "/Encoding /Identity-H\n";
        $res.=  "/DescendantFonts [".$o['info']['cidFont']." 0 R]\n";
        $res.=  "/ToUnicode ".$o['info']['toUnicode']." 0 R\n";
        $res.=  ">>\n";
        $res.=  "endobj";

      } else {
      $res =  "\n".$id." 0 obj\n<< /Type /Font\n/Subtype /".$o['info']['SubType']."\n";

      $res.=  "/Name /F".$o['info']['fontNum']."\n";

      $res.=  "/BaseFont /".$o['info']['name']."\n";

      if  (isset($o['info']['encodingDictionary'])) {

        // then place a reference to the dictionary
        $res.=  "/Encoding ".$o['info']['encodingDictionary']." 0 R\n";
      } else  if  (isset($o['info']['encoding'])) {

        // use the specified encoding
        $res.=  "/Encoding /".$o['info']['encoding']."\n";
      }

      if  (isset($o['info']['FirstChar'])) {

        $res.=  "/FirstChar ".$o['info']['FirstChar']."\n";
      }

      if  (isset($o['info']['LastChar'])) {

        $res.=  "/LastChar ".$o['info']['LastChar']."\n";
      }

      if  (isset($o['info']['Widths'])) {

        $res.=  "/Widths ".$o['info']['Widths']." 0 R\n";
      }

      if  (isset($o['info']['FontDescriptor'])) {

        $res.=  "/FontDescriptor ".$o['info']['FontDescriptor']." 0 R\n";
      }

        $res.=  ">>\n";
        $res.=  "endobj";
        
      }

      return  $res;

      break;
    }
  }


  /**
   * a font descriptor, needed for including additional fonts
   */
  function  o_fontDescriptor($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'fontDescriptor', 'info'=>$options);

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n<< /Type /FontDescriptor\n";

      foreach ($o['info'] as  $label => $value) {

        switch  ($label) {

        case  'Ascent':

        case  'CapHeight':

        case  'Descent':

        case  'Flags':

        case  'ItalicAngle':

        case  'StemV':

        case  'AvgWidth':

        case  'Leading':

        case  'MaxWidth':

        case  'MissingWidth':

        case  'StemH':

        case  'XHeight':

        case  'CharSet':

          if  (mb_strlen($value)) {

            $res.= '/'.$label.' '.$value."\n";
          }

          break;

        case  'FontFile':

        case  'FontFile2':

        case  'FontFile3':

          $res.= '/'.$label.' '.$value." 0 R\n";

          break;

        case  'FontBBox':

          $res.= '/'.$label.' ['.$value[0].' '.$value[1].' '.$value[2].' '.$value[3]."]\n";

          break;

        case  'FontName':

          $res.= '/'.$label.' /'.$value."\n";

          break;
        }
      }

      $res.= ">>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * the font encoding
   */
  function  o_fontEncoding($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      // the options array should contain 'differences' and maybe 'encoding'
      $this->objects[$id] = array('t'=>'fontEncoding', 'info'=>$options);

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n<< /Type /Encoding\n";

      if  (!isset($o['info']['encoding'])) {

        $o['info']['encoding'] = 'WinAnsiEncoding';
      }

      if  ($o['info']['encoding'] != 'none') {

        $res.= "/BaseEncoding /".$o['info']['encoding']."\n";
      }

      $res.= "/Differences \n[";

      $onum = -100;

      foreach($o['info']['differences'] as  $num=>$label) {

        if  ($num != $onum+1) {

          // we cannot make use of consecutive numbering
          $res.=  "\n".$num." /".$label;
        } else {

          $res.=  " /".$label;
        }

        $onum = $num;
      }

      $res.= "\n]\n>>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * a descendent cid font,  needed for unicode fonts
   */
  function  o_fontDescendentCID($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] =  array('t'=>'fontDescendentCID', 'info'=>$options);

      // we need a CID system info section
      $cidSystemInfoId = ++$this->numObj;
      $this->o_contents($cidSystemInfoId, 'new', 'raw');
      $this->objects[$id]['info']['cidSystemInfo'] = $cidSystemInfoId;
      $res=   "<</Registry (Adobe)\n"; // A string identifying an issuer of character collections
      $res.=  "/Ordering (UCS)\n"; // A string that uniquely names a character collection issued by a specific registry
      $res.=  "/Supplement 0\n"; // The supplement number of the character collection.
      $res.=  ">>";
      $this->objects[$cidSystemInfoId]['c'] = $res;

      // and a CID to GID map
      $cidToGidMapId = ++$this->numObj;
      $this->o_fontGIDtoCIDMap($cidToGidMapId, 'new', $options);
      $this->objects[$id]['info']['cidToGidMap'] = $cidToGidMapId;
      
      break;

    case  'add':

      foreach ($options as  $k => $v) {
        switch  ($k) {
        case  'BaseFont':
          $o['info']['name'] =  $v;
          break;

        case  'FirstChar':
        case  'LastChar':
        case  'MissingWidth':
        case  'FontDescriptor':
        case  'SubType':
          $this->addMessage('o_fontDescendentCID '.$k." : ".$v);
          $o['info'][$k] =  $v;
          break;
        }
      }

      // pass values down to cid to gid map
      $this->o_fontGIDtoCIDMap($o['info']['cidToGidMap'], 'add', $options);
      
      break;

    case  'out':

      $res =  "\n".$id." 0 obj\n";
      $res.=  "<</Type /Font\n";
      $res.=  "/Subtype /CIDFontType2\n";
      $res.=  "/BaseFont /".$o['info']['name']."\n";
      $res.=  "/CIDSystemInfo ".$o['info']['cidSystemInfo']." 0 R\n";
//      if  (isset($o['info']['FirstChar'])) {
//
//        $res.=  "/FirstChar ".$o['info']['FirstChar']."\n";
//      }

//      if  (isset($o['info']['LastChar'])) {
//
//        $res.=  "/LastChar ".$o['info']['LastChar']."\n";
//      }
      if  (isset($o['info']['FontDescriptor'])) {

        $res.=  "/FontDescriptor ".$o['info']['FontDescriptor']." 0 R\n";
      }

      if  (isset($o['info']['MissingWidth'])) {
        $res.=  "/DW ".$o['info']['MissingWidth']."\n";
      }

      if  (isset($o['info']['fontFileName']) && isset($this->fonts[$o['info']['fontFileName']]['CIDWidths'])) {
        $cid_widths = &$this->fonts[$o['info']['fontFileName']]['CIDWidths'];
        $w = '';
        foreach ($cid_widths as $cid => $width) {
          $w .= $cid.' ['.$width.'] ';
        }
        $res.=  "/W [".$w."]\n";
      }

      $res.=  "/CIDToGIDMap ".$o['info']['cidToGidMap']." 0 R\n";
      $res.=  ">>\n";
      $res.=  "endobj";

      return  $res;

      break;
    }
  }
  

  /**
   * a font glyph to character map,  needed for unicode fonts
   */
  function  o_fontGIDtoCIDMap($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] =  array('t'=>'fontGIDtoCIDMap', 'info'=>$options);

      break;

    case  'out':
       
      $res = "\n".$id." 0 obj\n";
      $tmp = $this->fonts[$o['info']['fontFileName']]['CIDtoGID'] = base64_decode($this->fonts[$o['info']['fontFileName']]['CIDtoGID']);
      $compressed = isset($this->fonts[$o['info']['fontFileName']]['CIDtoGID_Compressed']) &&
                    $this->fonts[$o['info']['fontFileName']]['CIDtoGID_Compressed'];

      if  (!$compressed && isset($o['raw'])) {

        $res.= $tmp;
      } else {

        $res.=  "<<";

        if  (!$compressed && function_exists('gzcompress') &&  $this->options['compression']) {

          // then implement ZLIB based compression on this content stream
          $compressed = true;

          $tmp =  gzcompress($tmp,  6);
        }
        if ($compressed) {

          $res.= "\n/Filter /FlateDecode";
        }

        $res.= "\n/Length ".mb_strlen($tmp) .">>\nstream\n".$tmp."\nendstream";
      }

      $res.= "\nendobj";

      return  $res;

      break;
    }
  }
  

  /**
   * the document procset, solves some problems with printing to old PS printers
   */
  function  o_procset($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'procset', 'info'=>array('PDF'=>1, 'Text'=>1));

      $this->o_pages($this->currentNode, 'procset', $id);

      $this->procsetObjectId = $id;

      break;

    case  'add':

      // this is to add new items to the procset list, despite the fact that this is considered
      // obselete, the items are required for printing to some postscript printers
      switch  ($options) {

      case  'ImageB':

      case  'ImageC':

      case  'ImageI':

        $o['info'][$options] = 1;

        break;
      }

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n[";

      foreach ($o['info'] as  $label=>$val) {

        $res.= '/'.$label.' ';
      }

      $res.= "]\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * define the document information
   */
  function  o_info($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->infoObject = $id;

      $date = 'D:'.@date('Ymd');

      $this->objects[$id] = array('t'=>'info', 'info'=>array('Creator'=>'R and OS php pdf writer, http://www.ros.co.nz', 'CreationDate'=>$date));

      break;

    case  'Title':

    case  'Author':

    case  'Subject':

    case  'Keywords':

    case  'Creator':

    case  'Producer':

    case  'CreationDate':

    case  'ModDate':

    case  'Trapped':

      $o['info'][$action] = $options;

      break;

    case  'out':

      if  ($this->encrypted) {

        $this->encryptInit($id);
      }

      $res = "\n".$id." 0 obj\n<<\n";

      foreach ($o['info'] as  $k=>$v) {

        $res.= '/'.$k.' (';

        // dates must be outputted as-is, without Unicode transformations
        $raw = ($k == 'CreationDate' || $k == 'ModDate');
        $c = $v;

        if  ($this->encrypted) {

          $c = $this->ARC4($c);
        }

        $res.= ($raw) ? $c : $this->filterText($c);

        $res.= ")\n";
      }

      $res.= ">>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * an action object, used to link to URLS initially
   */
  function  o_action($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      if  (is_array($options)) {

        $this->objects[$id] = array('t'=>'action', 'info'=>$options, 'type'=>$options['type']);
      } else {

        // then assume a URI action
        $this->objects[$id] = array('t'=>'action', 'info'=>$options, 'type'=>'URI');
      }

      break;

    case  'out':

      if  ($this->encrypted) {

        $this->encryptInit($id);
      }

      $res = "\n".$id." 0 obj\n<< /Type /Action";

      switch ($o['type']) {

      case  'ilink':

        // there will be an 'label' setting, this is the name of the destination
        $res.= "\n/S /GoTo\n/D ".$this->destinations[(string)$o['info']['label']]." 0 R";

        break;

      case  'URI':

        $res.= "\n/S /URI\n/URI (";

        if  ($this->encrypted) {

          $res.= $this->filterText($this->ARC4($o['info']));
        } else {

          $res.= $this->filterText($o['info']);
        }

        $res.= ")";

        break;
      }

      $res.= "\n>>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * an annotation object, this will add an annotation to the current page.
   * initially will support just link annotations
   */
  function  o_annotation($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      // add the annotation to the current page
      $pageId =  $this->currentPage;

      $this->o_page($pageId, 'annot', $id);

      // and add the action object which is going to be required
      switch ($options['type']) {

      case  'link':

        $this->objects[$id] = array('t'=>'annotation', 'info'=>$options);

        $this->numObj++;

        $this->o_action($this->numObj, 'new', $options['url']);

        $this->objects[$id]['info']['actionId'] = $this->numObj;

        break;

      case  'ilink':

        // this is to a named internal link
        $label =  $options['label'];

        $this->objects[$id] = array('t'=>'annotation', 'info'=>$options);

        $this->numObj++;

        $this->o_action($this->numObj, 'new', array('type'=>'ilink', 'label'=>$label));

        $this->objects[$id]['info']['actionId'] = $this->numObj;

        break;
      }

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n<< /Type /Annot";

      switch ($o['info']['type']) {

      case  'link':

      case  'ilink':

        $res.=  "\n/Subtype /Link";

        break;
      }

      $res.= "\n/A ".$o['info']['actionId']." 0 R";

      $res.= "\n/Border [0 0 0]";

      $res.= "\n/H /I";

      $res.= "\n/Rect [ ";

      foreach($o['info']['rect'] as  $v) {

        $res.=  sprintf("%.4F ", $v);
      }

      $res.= "]";

      $res.= "\n>>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * a page object, it also creates a contents object to hold its contents
   */
  function  o_page($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->numPages++;

      $this->objects[$id] = array('t'=>'page', 'info'=>array('parent'=>$this->currentNode, 'pageNum'=>$this->numPages));

      if  (is_array($options)) {

        // then this must be a page insertion, array shoudl contain 'rid','pos'=[before|after]
        $options['id'] = $id;

        $this->o_pages($this->currentNode, 'page', $options);
      } else {

        $this->o_pages($this->currentNode, 'page', $id);
      }

      $this->currentPage = $id;

      //make a contents object to go with this page
      $this->numObj++;

      $this->o_contents($this->numObj, 'new', $id);

      $this->currentContents = $this->numObj;

      $this->objects[$id]['info']['contents'] = array();

      $this->objects[$id]['info']['contents'][] = $this->numObj;

      $match =  ($this->numPages%2 ?  'odd' :  'even');

      foreach($this->addLooseObjects as  $oId=>$target) {

        if  ($target == 'all' ||  $match == $target) {

          $this->objects[$id]['info']['contents'][] = $oId;
        }
      }

      break;

    case  'content':

      $o['info']['contents'][] = $options;

      break;

    case  'annot':

      // add an annotation to this page
      if  (!isset($o['info']['annot'])) {

        $o['info']['annot'] = array();
      }

      // $options should contain the id of the annotation dictionary
      $o['info']['annot'][] = $options;

      break;

    case  'out':

      $res = "\n".$id." 0 obj\n<< /Type /Page";

      $res.= "\n/Parent ".$o['info']['parent']." 0 R";

      if  (isset($o['info']['annot'])) {

        $res.= "\n/Annots [";

        foreach($o['info']['annot'] as  $aId) {

          $res.= " ".$aId." 0 R";
        }

        $res.= " ]";
      }

      $count =  count($o['info']['contents']);

      if  ($count == 1) {

        $res.= "\n/Contents ".$o['info']['contents'][0]." 0 R";
      } else  if  ($count>1) {

        $res.= "\n/Contents [\n";

        // reverse the page contents so added objects are below normal content
        //foreach (array_reverse($o['info']['contents']) as  $cId) {

        // Back to normal now that I've got transparency working --Benj
        foreach ($o['info']['contents'] as  $cId) {
          $res.= $cId." 0 R\n";
        }

        $res.= "]";
      }

      $res.= "\n>>\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * the contents objects hold all of the content which appears on pages
   */
  function  o_contents($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  'new':

      $this->objects[$id] = array('t'=>'contents', 'c'=>'', 'info'=>array());

      if  (mb_strlen($options) &&  intval($options)) {

        // then this contents is the primary for a page
        $this->objects[$id]['onPage'] = $options;
      } else  if  ($options == 'raw') {

        // then this page contains some other type of system object
        $this->objects[$id]['raw'] = 1;
      }

      break;

    case  'add':

      // add more options to the decleration
      foreach ($options as  $k=>$v) {

        $o['info'][$k] = $v;
      }

    case  'out':
      $tmp = $o['c'];

      $res =  "\n".$id." 0 obj\n";

      if  (isset($this->objects[$id]['raw'])) {

        $res.= $tmp;
      } else {

        $res.=  "<<";

        if  (function_exists('gzcompress') &&  $this->options['compression']) {

          // then implement ZLIB based compression on this content stream
          $res.= " /Filter /FlateDecode";

          $tmp =  gzcompress($tmp,  6);
        }

        if  ($this->encrypted) {

          $this->encryptInit($id);

          $tmp =  $this->ARC4($tmp);
        }

        foreach($o['info'] as  $k=>$v) {

          $res.=  "\n/".$k.' '.$v;
        }

        $res.= "\n/Length ".mb_strlen($tmp) ." >>\nstream\n".$tmp."\nendstream";
      }

      $res.= "\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * an image object, will be an XObject in the document, includes description and data
   */
  function  o_image($id, $action, $options = '') {

    if  ($action != 'new') {
      $o = & $this->objects[$id];
    }

    switch ($action) {

    case  'new':

      // make the new object
      $this->objects[$id] = array('t'=>'image', 'data'=>&$options['data'], 'info'=>array());

      $this->objects[$id]['info']['Type'] = '/XObject';

      $this->objects[$id]['info']['Subtype'] = '/Image';

      $this->objects[$id]['info']['Width'] = $options['iw'];

      $this->objects[$id]['info']['Height'] = $options['ih'];

      if  (!isset($options['type']) ||  $options['type'] == 'jpg') {

        if  (!isset($options['channels'])) {

          $options['channels'] = 3;
        }

        switch ($options['channels']) {

        case  1:

          $this->objects[$id]['info']['ColorSpace'] = '/DeviceGray';

          break;

        default:

          $this->objects[$id]['info']['ColorSpace'] = '/DeviceRGB';

          break;
        }

        $this->objects[$id]['info']['Filter'] = '/DCTDecode';

        $this->objects[$id]['info']['BitsPerComponent'] = 8;
      } else  if  ($options['type'] == 'png') {
        
        $this->objects[$id]['info']['Filter'] = '/FlateDecode';

        $this->objects[$id]['info']['DecodeParms'] = '<< /Predictor 15 /Colors '.$options['ncolor'].' /Columns '.$options['iw'].' /BitsPerComponent '.$options['bitsPerComponent'].'>>';
        if  (mb_strlen($options['pdata'])) {

          $tmp =  ' [ /Indexed /DeviceRGB '.(mb_strlen($options['pdata']) /3-1) .' ';

          $this->numObj++;

          $this->o_contents($this->numObj, 'new');

          $this->objects[$this->numObj]['c'] = $options['pdata'];

          $tmp.= $this->numObj.' 0 R';

          $tmp.= ' ]';

          $this->objects[$id]['info']['ColorSpace'] =  $tmp;

          if  (isset($options['transparency'])) {

            switch ($options['transparency']['type']) {

            case  'indexed':

              $tmp = ' [ '.$options['transparency']['data'].' '.$options['transparency']['data'].'] ';

              $this->objects[$id]['info']['Mask'] =  $tmp;

              break;

            case 'color-key':
              $tmp = ' [ '.
                $options['transparency']['r'] . ' ' . $options['transparency']['r'] .
                $options['transparency']['g'] . ' ' . $options['transparency']['g'] .
                $options['transparency']['b'] . ' ' . $options['transparency']['b'] .
                ' ] ';
              $this->objects[$id]['info']['Mask'] = $tmp;
              pre_r($tmp);
              break;
              
            }
          }
        } else {

          if  (isset($options['transparency'])) {

            switch ($options['transparency']['type']) {

            case  'indexed':

              $tmp = ' [ '.$options['transparency']['data'].' '.$options['transparency']['data'].'] ';

              $this->objects[$id]['info']['Mask'] =  $tmp;

              break;

            case 'color-key':
              $tmp = ' [ '.
                $options['transparency']['r'] . ' ' . $options['transparency']['r'] . ' ' .
                $options['transparency']['g'] . ' ' . $options['transparency']['g'] . ' ' .
                $options['transparency']['b'] . ' ' . $options['transparency']['b'] .
                ' ] ';
              $this->objects[$id]['info']['Mask'] = $tmp;
              break;
              
            }
          }
          $this->objects[$id]['info']['ColorSpace'] = '/'.$options['color'];
        }

        $this->objects[$id]['info']['BitsPerComponent'] = $options['bitsPerComponent'];
      }

      // assign it a place in the named resource dictionary as an external object, according to
      // the label passed in with it.
      $this->o_pages($this->currentNode, 'xObject', array('label'=>$options['label'], 'objNum'=>$id));

      // also make sure that we have the right procset object for it.
      $this->o_procset($this->procsetObjectId, 'add', 'ImageC');

      break;

    case  'out':

      $tmp = &$o['data'];

      $res =  "\n".$id." 0 obj\n<<";

      foreach($o['info'] as  $k=>$v) {

        $res.= "\n/".$k.' '.$v;
      }

      if  ($this->encrypted) {

        $this->encryptInit($id);

        $tmp =  $this->ARC4($tmp);
      }

      $res.= "\n/Length ".mb_strlen($tmp, '8bit') .">>\nstream\n".$tmp."\nendstream\nendobj";

      return  $res;

      break;
    }
  }


  /**
   * graphics state object
   */
  function  o_extGState($id,  $action,  $options = "") {

    static  $valid_params =  array("LW",  "LC",  "LC",  "LJ",  "ML",
                                   "D",  "RI",  "OP",  "op",  "OPM",
                                   "Font",  "BG",  "BG2",  "UCR",
                                   "TR",  "TR2",  "HT",  "FL",
                                   "SM",  "SA",  "BM",  "SMask",
                                   "CA",  "ca",  "AIS",  "TK");

    if  ( $action !=  "new") {
      $o = & $this->objects[$id];
    }

    switch  ($action) {

    case  "new":
      $this->objects[$id] =  array('t' => 'extGState',  'info' => $options);

      // Tell the pages about the new resource
      $this->numStates++;
      $this->o_pages($this->currentNode,  'extGState',  array("objNum" => $id,  "stateNum" => $this->numStates));
      break;


    case  "out":
      $res =
        "\n" . $id . " 0 obj\n".
        "<< /Type /ExtGState\n";

      foreach ($o["info"] as  $parameter => $value) {
        if  ( !in_array($parameter,  $valid_params))
          continue;
        $res.=  "/$parameter $value\n";
      }

      $res.=
        ">>\n".
        "endobj";

      return  $res;
    }
  }


  /**
   * encryption object.
   */
  function  o_encryption($id, $action, $options = '') {

    if  ($action != 'new') {

      $o = & $this->objects[$id];
    }

    switch ($action) {

    case  'new':

      // make the new object
      $this->objects[$id] = array('t'=>'encryption', 'info'=>$options);

      $this->arc4_objnum = $id;

      // figure out the additional paramaters required
      $pad =  chr(0x28) .chr(0xBF) .chr(0x4E) .chr(0x5E) .chr(0x4E) .chr(0x75) .chr(0x8A) .chr(0x41) .chr(0x64) .chr(0x00) .chr(0x4E) .chr(0x56) .chr(0xFF) .chr(0xFA) .chr(0x01) .chr(0x08) .chr(0x2E) .chr(0x2E) .chr(0x00) .chr(0xB6) .chr(0xD0) .chr(0x68) .chr(0x3E) .chr(0x80) .chr(0x2F) .chr(0x0C) .chr(0xA9) .chr(0xFE) .chr(0x64) .chr(0x53) .chr(0x69) .chr(0x7A);

      $len =  mb_strlen($options['owner']);

      if  ($len>32) {

        $owner =  substr($options['owner'], 0, 32);
      } else  if  ($len<32) {

        $owner =  $options['owner'].substr($pad, 0, 32-$len);
      } else {

        $owner =  $options['owner'];
      }

      $len =  mb_strlen($options['user']);

      if  ($len>32) {

        $user =  substr($options['user'], 0, 32);
      } else  if  ($len<32) {

        $user =  $options['user'].substr($pad, 0, 32-$len);
      } else {

        $user =  $options['user'];
      }

      $tmp =  $this->md5_16($owner);

      $okey =  substr($tmp, 0, 5);

      $this->ARC4_init($okey);

      $ovalue = $this->ARC4($user);

      $this->objects[$id]['info']['O'] = $ovalue;

      // now make the u value, phew.
      $tmp =  $this->md5_16($user.$ovalue.chr($options['p']) .chr(255) .chr(255) .chr(255) .$this->fileIdentifier);

      $ukey =  substr($tmp, 0, 5);


      $this->ARC4_init($ukey);

      $this->encryptionKey =  $ukey;

      $this->encrypted = 1;

      $uvalue = $this->ARC4($pad);


      $this->objects[$id]['info']['U'] = $uvalue;

      $this->encryptionKey = $ukey;


      // initialize the arc4 array
      break;

    case  'out':

      $res =  "\n".$id." 0 obj\n<<";

      $res.= "\n/Filter /Standard";

      $res.= "\n/V 1";

      $res.= "\n/R 2";

      $res.= "\n/O (".$this->filterText($o['info']['O']) .')';

      $res.= "\n/U (".$this->filterText($o['info']['U']) .')';

      // and the p-value needs to be converted to account for the twos-complement approach
      $o['info']['p'] =  (($o['info']['p']^255) +1) *-1;

      $res.= "\n/P ".($o['info']['p']);

      $res.= "\n>>\nendobj";


      return  $res;

      break;
    }
  }


  /**
   * ARC4 functions
   * A series of function to implement ARC4 encoding in PHP
   */

  /**
   * calculate the 16 byte version of the 128 bit md5 digest of the string
   */
  function  md5_16($string) {

    $tmp =  md5($string);

    $out = '';

    for  ($i = 0;$i <= 30;$i = $i+2) {

      $out.= chr(hexdec(substr($tmp, $i, 2)));
    }

    return  $out;
  }


  /**
   * initialize the encryption for processing a particular object
   */
  function  encryptInit($id) {

    $tmp =  $this->encryptionKey;

    $hex =  dechex($id);

    if  (mb_strlen($hex) <6) {

      $hex =  substr('000000', 0, 6-mb_strlen($hex)) .$hex;
    }

    $tmp.=  chr(hexdec(substr($hex, 4, 2))) .chr(hexdec(substr($hex, 2, 2))) .chr(hexdec(substr($hex, 0, 2))) .chr(0) .chr(0);

    $key =  $this->md5_16($tmp);

    $this->ARC4_init(substr($key, 0, 10));
  }


  /**
   * initialize the ARC4 encryption
   */
  function  ARC4_init($key = '') {

    $this->arc4 =  '';

    // setup the control array
    if  (mb_strlen($key) == 0) {

      return;
    }

    $k =  '';

    while (mb_strlen($k) <256) {

      $k.= $key;
    }

    $k = substr($k, 0, 256);

    for  ($i = 0;$i<256;$i++) {

      $this->arc4.=  chr($i);
    }

    $j = 0;

    for  ($i = 0;$i<256;$i++) {

      $t =  $this->arc4[$i];

      $j =  ($j + ord($t)  + ord($k[$i])) %256;

      $this->arc4[$i] = $this->arc4[$j];

      $this->arc4[$j] = $t;
    }
  }


  /**
   * ARC4 encrypt a text string
   */
  function  ARC4($text) {

    $len = mb_strlen($text);

    $a = 0;

    $b = 0;

    $c =  $this->arc4;

    $out = '';

    for  ($i = 0;$i<$len;$i++) {

      $a =  ($a+1) %256;

      $t =  $c[$a];

      $b =  ($b+ord($t)) %256;

      $c[$a] = $c[$b];

      $c[$b] = $t;

      $k =  ord($c[(ord($c[$a]) +ord($c[$b])) %256]);

      $out.= chr(ord($text[$i])  ^ $k);
    }


    return  $out;
  }


  /**
   * functions which can be called to adjust or add to the document
   */

  /**
   * add a link in the document to an external URL
   */
  function  addLink($url, $x0, $y0, $x1, $y1) {

    $this->numObj++;

    $info =  array('type'=>'link', 'url'=>$url, 'rect'=>array($x0, $y0, $x1, $y1));

    $this->o_annotation($this->numObj, 'new', $info);
  }


  /**
   * add a link in the document to an internal destination (ie. within the document)
   */
  function  addInternalLink($label, $x0, $y0, $x1, $y1) {

    $this->numObj++;

    $info =  array('type'=>'ilink', 'label'=>$label, 'rect'=>array($x0, $y0, $x1, $y1));

    $this->o_annotation($this->numObj, 'new', $info);
  }


  /**
   * set the encryption of the document
   * can be used to turn it on and/or set the passwords which it will have.
   * also the functions that the user will have are set here, such as print, modify, add
   */
  function  setEncryption($userPass = '', $ownerPass = '', $pc = array()) {

    $p = bindec(11000000);


    $options =  array(
                      'print'=>4, 'modify'=>8, 'copy'=>16, 'add'=>32);

    foreach($pc as  $k=>$v) {

      if  ($v &&  isset($options[$k])) {

        $p+= $options[$k];
      } else  if  (isset($options[$v])) {

        $p+= $options[$v];
      }
    }

    // implement encryption on the document
    if  ($this->arc4_objnum ==  0) {

      // then the block does not exist already, add it.
      $this->numObj++;

      if  (mb_strlen($ownerPass) == 0) {

        $ownerPass = $userPass;
      }

      $this->o_encryption($this->numObj, 'new', array('user'=>$userPass, 'owner'=>$ownerPass, 'p'=>$p));
    }
  }


  /**
   * should be used for internal checks, not implemented as yet
   */
  function  checkAllHere() {
  }


  /**
   * return the pdf stream as a string returned from the function
   */
  function  output($debug = 0) {


    if  ($debug) {
      // turn compression off
      $this->options['compression'] = 0;
    }


    if  ($this->arc4_objnum) {

      $this->ARC4_init($this->encryptionKey);
    }


    $this->checkAllHere();


    $xref = array();

    $content = '%PDF-1.3';
    $pos = mb_strlen($content);

    foreach($this->objects as  $k=>$v) {

      $tmp = 'o_'.$v['t'];

      $cont = $this->$tmp($k, 'out');

      $content.= $cont;

      $xref[] = $pos;

      $pos+= mb_strlen($cont);
    }

    $content.= "\nxref\n0 ".(count($xref) +1) ."\n0000000000 65535 f \n";

    foreach($xref as  $p) {

      $content.= str_pad($p,  10,  "0",  STR_PAD_LEFT)  . " 00000 n \n";
    }

    $content.= "trailer\n<<\n/Size ".(count($xref) +1) ."\n/Root 1 0 R\n/Info ".$this->infoObject." 0 R\n";

    // if encryption has been applied to this document then add the marker for this dictionary
    if  ($this->arc4_objnum > 0) {

      $content.=  "/Encrypt ".$this->arc4_objnum." 0 R\n";
    }

    if  (mb_strlen($this->fileIdentifier)) {

      $content.=  "/ID[<".$this->fileIdentifier."><".$this->fileIdentifier.">]\n";
    }

    $content.=  ">>\nstartxref\n".$pos."\n%%EOF\n";

    return  $content;
  }


  /**
   * intialize a new document
   * if this is called on an existing document results may be unpredictable, but the existing document would be lost at minimum
   * this function is called automatically by the constructor function
   *
   * @access private
   */
  function  newDocument($pageSize = array(0, 0, 612, 792)) {

    $this->numObj = 0;

    $this->objects =  array();


    $this->numObj++;

    $this->o_catalog($this->numObj, 'new');


    $this->numObj++;

    $this->o_outlines($this->numObj, 'new');


    $this->numObj++;

    $this->o_pages($this->numObj, 'new');


    $this->o_pages($this->numObj, 'mediaBox', $pageSize);

    $this->currentNode =  3;


    $this->numObj++;

    $this->o_procset($this->numObj, 'new');


    $this->numObj++;

    $this->o_info($this->numObj, 'new');


    $this->numObj++;

    $this->o_page($this->numObj, 'new');


    // need to store the first page id as there is no way to get it to the user during
    // startup
    $this->firstPageId =  $this->currentContents;
  }


  /**
   * open the font file and return a php structure containing it.
   * first check if this one has been done before and saved in a form more suited to php
   * note that if a php serialized version does not exist it will try and make one, but will
   * require write access to the directory to do it... it is MUCH faster to have these serialized
   * files.
   *
   * @access private
   */
  function  openFont($font) {

    // assume that $font contains the path and file but not the extension
    $pos = strrpos($font, '/');

    if  ($pos === false) {

      $dir =  './';

      $name =  $font;
    } else {

      $dir = substr($font, 0, $pos+1);

      $name = substr($font, $pos+1);
    }
    
    $fontcache = $this->fontcache;
    if ($fontcache == '') {
    	$fontcache = $dir;
    }
    
    //$name       filename without folder and extension of font metrics
    //$dir		  folder of font metrics
    //$fontcache  folder of runtime created php serialized version of font metrics.
    //            If this is not given, the same folder as the font metrics will be used.
    //            Storing and reusing serialized versions improves speed much
    
    $this->addMessage('openFont: '.$font.' - '.$name);

    $metrics_name = $name . (($this->isUnicode) ? '.ufm' : '.afm');
    $cache_name = 'php_' . $metrics_name;
    $this->addMessage('metrics: '.$metrics_name.', cache: '.$cache_name);
    if  (file_exists($fontcache . $cache_name)) {

      $this->addMessage('openFont: php file exists ' . $fontcache . $cache_name);

      $tmp =  file_get_contents($fontcache . $cache_name);

      eval($tmp);

      if  (!isset($this->fonts[$font]['_version_']) ||  $this->fonts[$font]['_version_']<1) {

        // if the font file is old, then clear it out and prepare for re-creation
        $this->addMessage('openFont: clear out, make way for new version.');

        unset($this->fonts[$font]);
      }
    }

    if  (!isset($this->fonts[$font]) &&  file_exists($dir . $metrics_name)) {

      // then rebuild the php_<font>.afm file from the <font>.afm file
      $this->addMessage('openFont: build php file from ' . $dir . $metrics_name);

      $data =  array();
      $cidtogid = '';
      if ($this->isUnicode) {
        $cidtogid = str_pad('', 256*256*2, "\x00");
      }

      $file =  file($dir . $metrics_name);

      foreach ($file as  $rowA) {

        $row = trim($rowA);

        $pos = strpos($row, ' ');

        if  ($pos) {

          // then there must be some keyword
          $key =  substr($row, 0, $pos);

          switch  ($key) {

          case  'FontName':

          case  'FullName':

          case  'FamilyName':

          case  'Weight':

          case  'ItalicAngle':

          case  'IsFixedPitch':

          case  'CharacterSet':

          case  'UnderlinePosition':

          case  'UnderlineThickness':

          case  'Version':

          case  'EncodingScheme':

          case  'CapHeight':

          case  'XHeight':

          case  'Ascender':

          case  'Descender':

          case  'StdHW':

          case  'StdVW':

          case  'StartCharMetrics':

          case  'FontHeightOffset': // OAR - Added so we can offset the height calculation of a Windows font.  Otherwise it's too big.

            $data[$key] = trim(substr($row, $pos));

            break;

          case  'FontBBox':

            $data[$key] = explode(' ', trim(substr($row, $pos)));

            break;

          case  'C': // Found in AFM files

            //C 39 ; WX 222 ; N quoteright ; B 53 463 157 718 ;
            $bits = explode(';', trim($row));

            $dtmp = array();

            foreach($bits as  $bit) {

              $bits2 =  explode(' ', trim($bit));

              if  (mb_strlen($bits2[0])) {

                if  (count($bits2) >2) {

                  $dtmp[$bits2[0]] = array();

                  for  ($i = 1;$i<count($bits2);$i++) {

                    $dtmp[$bits2[0]][] = $bits2[$i];
                  }
                } else  if  (count($bits2) == 2) {

                  $dtmp[$bits2[0]] = $bits2[1];
                }
              }
            }

            $cc = (int)$dtmp['C'];
            if  ($cc >= 0) {

              $data['C'][$dtmp['C']] = $dtmp;

              $data['C'][$dtmp['N']] = $dtmp;
            } else {

              $data['C'][$dtmp['N']] = $dtmp;
            }

            if  (!isset($data['MissingWidth']) && $cc == -1 && $dtmp['N'] == '.notdef') {

              $data['MissingWidth'] = $width;
            }
            
            break;

          case  'U': // Found in UFM files
            if ($this->isUnicode) {
              // U 827 ; WX 0 ; N squaresubnosp ; G 675 ;
              $bits = explode(';', trim($row));
              
              $dtmp = array();

              foreach($bits as  $bit) {

                $bits2 =  explode(' ', trim($bit));

                if  (mb_strlen($bits2[0])) {

                  if  (count($bits2) >2) {

                    $dtmp[$bits2[0]] = array();

                    for  ($i = 1;$i<count($bits2);$i++) {

                      $dtmp[$bits2[0]][] = $bits2[$i];
                    }
                  } else  if  (count($bits2) == 2) {

                    $dtmp[$bits2[0]] = $bits2[1];
                  }
                }
              }

              $cc = (int)$dtmp['U'];
              $glyph = $dtmp['G'];
              $width = $dtmp['WX'];
              if  ($cc >= 0) {
                // Set values in CID to GID map
                if ($cc >= 0 && $cc < 0xFFFF && $glyph) {
                  $cidtogid{$cc*2} = chr($glyph >> 8);
                  $cidtogid{$cc*2 + 1} = chr($glyph & 0xFF);
                }

                $data['C'][$dtmp['U']] = $dtmp;

                $data['C'][$dtmp['N']] = $dtmp;
              } else {

                $data['C'][$dtmp['N']] = $dtmp;
              }
              
              if  (!isset($data['MissingWidth']) && $cc == -1 && $dtmp['N'] == '.notdef') {

                $data['MissingWidth'] = $width;
              }
            }

            break;

          case  'KPX':

            //KPX Adieresis yacute -40
            $bits = explode(' ', trim($row));

            $data['KPX'][$bits[1]][$bits[2]] = $bits[3];

            break;
          }
        }
      }

      //    echo $cidtogid; die("CIDtoGID Displayed!");

      if  (function_exists('gzcompress') &&  $this->options['compression']) {

        // then implement ZLIB based compression on CIDtoGID string
        $data['CIDtoGID_Compressed'] = true;

        $cidtogid =  gzcompress($cidtogid,  6);
      }
      $data['CIDtoGID'] = base64_encode($cidtogid);
      
      $data['_version_'] = 1;

      $this->fonts[$font] = $data;

      //Because of potential trouble with php safe mode, expect that the folder already exists.
      //If not existing, this will hit performance because of missing cached results.
      if ( is_dir(substr($fontcache,0,-1)) ) {
        file_put_contents($fontcache . $cache_name,  '$this->fonts[$font]=' . var_export($data,  true)  . ';');
      }
    }
    
    if  (!isset($this->fonts[$font])) {
      $this->addMessage("openFont: no font file found for $font.  Do you need to run load_font.php?");
      //echo 'Font not Found '.$font;
    }

    //pre_r($this->messages);
  }


  /**
   * if the font is not loaded then load it and make the required object
   * else just make it the current font
   * the encoding array can contain 'encoding'=> 'none','WinAnsiEncoding','MacRomanEncoding' or 'MacExpertEncoding'
   * note that encoding='none' will need to be used for symbolic fonts
   * and 'differences' => an array of mappings between numbers 0->255 and character names.
   *
   */
  function  selectFont($fontName, $encoding =  '', $set =  true) {

    $ext = substr($fontName, -4);
    if  ($ext == '.afm' || $ext == '.ufm') {
      $fontName = substr($fontName, 0, mb_strlen($fontName)-4);
    }

    if  (!isset($this->fonts[$fontName])) {
      $this->addMessage("selectFont: selecting - $fontName - $encoding, $set");

      // load the file
      $this->openFont($fontName);

      if  (isset($this->fonts[$fontName])) {

        $this->numObj++;

        $this->numFonts++;

        //$this->numFonts = md5($fontName);
        $pos =  strrpos($fontName, '/');

        //      $dir = substr($fontName,0,$pos+1);
        $name =  substr($fontName, $pos+1);

        $options =  array('name' => $name, 'fontFileName' => $fontName);

        if  (is_array($encoding)) {

          // then encoding and differences might be set
          if  (isset($encoding['encoding'])) {

            $options['encoding'] =  $encoding['encoding'];
          }

          if  (isset($encoding['differences'])) {

            $options['differences'] =  $encoding['differences'];
          }
        } else  if  (mb_strlen($encoding)) {

          // then perhaps only the encoding has been set
          $options['encoding'] =  $encoding;
        }


        $fontObj =  $this->numObj;

        $this->o_font($this->numObj, 'new', $options);

        $this->fonts[$fontName]['fontNum'] =  $this->numFonts;


        // if this is a '.afm' font, and there is a '.pfa' file to go with it ( as there
        // should be for all non-basic fonts), then load it into an object and put the
        // references into the font object
        $basefile =  $fontName;
        if  (file_exists($basefile.'.pfb')) {

          $fbtype =  'pfb';
        } else  if  (file_exists($basefile.'.ttf')) {

          $fbtype =  'ttf';
        } else {

          $fbtype =  '';
        }

        $fbfile =  $basefile.'.'.$fbtype;


        //      $pfbfile = substr($fontName,0,strlen($fontName)-4).'.pfb';
        //      $ttffile = substr($fontName,0,strlen($fontName)-4).'.ttf';
        $this->addMessage('selectFont: checking for - '.$fbfile);


        // OAR - I don't understand this old check
        // if  (substr($fontName, -4) ==  '.afm' &&  strlen($fbtype)) {
        if  (mb_strlen($fbtype)) {
          $adobeFontName =  $this->fonts[$fontName]['FontName'];

          //        $fontObj = $this->numObj;
          $this->addMessage('selectFont: adding font file - '.$fbfile.' - '.$adobeFontName);

          // find the array of font widths, and put that into an object.
          $firstChar =  -1;

          $lastChar =  0;

          $widths =  array();
          $cid_widths = array();

          foreach ($this->fonts[$fontName]['C'] as  $num => $d) {

            if  (intval($num) >0 ||  $num ==  '0') {

              if (!$this->isUnicode) {
                // With Unicode, widths array isn't used
                if  ($lastChar>0 &&  $num>$lastChar+1) {

                  for ($i =  $lastChar+1;$i<$num;$i++) {

                    $widths[] =  0;
                  }
                }
              }

              $widths[] =  $d['WX'];

              if ($this->isUnicode) {
                $cid_widths[$num] =  $d['WX'];
              }

              if  ($firstChar ==  -1) {
                $firstChar =  $num;
              }

              $lastChar =  $num;
            }
          }

          // also need to adjust the widths for the differences array
          if  (isset($options['differences'])) {

            foreach($options['differences'] as  $charNum => $charName) {

              if  ($charNum > $lastChar) {

                if (!$this->isUnicode) {
                  // With Unicode, widths array isn't used
                  for ($i =  $lastChar + 1; $i <=  $charNum; $i++) {

                    $widths[] =  0;
                  }
                }

                $lastChar =  $charNum;
              }

              if  (isset($this->fonts[$fontName]['C'][$charName])) {

                $widths[$charNum-$firstChar] =  $this->fonts[$fontName]['C'][$charName]['WX'];
                if ($this->isUnicode) {
                  $cid_widths[$charName] =  $this->fonts[$fontName]['C'][$charName]['WX'];
                }
              }
            }
          }

          if ($this->isUnicode) {
            $this->fonts[$fontName]['CIDWidths'] = $cid_widths;
          }

          $this->addMessage('selectFont: FirstChar = '.$firstChar);

          $this->addMessage('selectFont: LastChar = '.$lastChar);

          $widthid = -1;

          if (!$this->isUnicode) {
            // With Unicode, widths array isn't used

            $this->numObj++;

            $this->o_contents($this->numObj, 'new', 'raw');

            $this->objects[$this->numObj]['c'].=  '[';

            foreach($widths as  $width) {
              $this->objects[$this->numObj]['c'].=  ' '.$width;
            }

            $this->objects[$this->numObj]['c'].=  ' ]';

            $widthid =  $this->numObj;
          }

          $missing_width = 500;
          $stemV = 70;

          if (isset($this->fonts[$fontName]['MissingWidth'])) {

            $missing_width =  $this->fonts[$fontName]['MissingWidth'];
          }
          if (isset($this->fonts[$fontName]['StdVW'])) {

            $stemV = $this->fonts[$fontName]['StdVW'];
          } elseif (isset($this->fonts[$fontName]['Weight']) && preg_match('!(bold|black)!i', $this->fonts[$fontName]['Weight'])) {

            $stemV = 120;
          }

          // load the pfb file, and put that into an object too.
          // note that pdf supports only binary format type 1 font files, though there is a
          // simple utility to convert them from pfa to pfb.
          $data =  file_get_contents($fbfile);


          // create the font descriptor
          $this->numObj++;

          $fontDescriptorId =  $this->numObj;

          $this->numObj++;

          $pfbid =  $this->numObj;

          // determine flags (more than a little flakey, hopefully will not matter much)
          $flags =  0;

          if  ($this->fonts[$fontName]['ItalicAngle'] !=  0) {
            $flags+=  pow(2, 6);
          }

          if  ($this->fonts[$fontName]['IsFixedPitch'] ==  'true') {
            $flags+=  1;
          }

          $flags+=  pow(2, 5); // assume non-sybolic

          $list =  array('Ascent' => 'Ascender', 'CapHeight' => 'CapHeight', 'MissingWidth' => 'MissingWidth', 'Descent' => 'Descender', 'FontBBox' => 'FontBBox', 'ItalicAngle' => 'ItalicAngle');

          $fdopt =  array('Flags' => $flags, 'FontName' => $adobeFontName, 'StemV' => $stemV);

          foreach($list as  $k => $v) {

            if  (isset($this->fonts[$fontName][$v])) {

              $fdopt[$k] =  $this->fonts[$fontName][$v];
            }
          }


          if  ($fbtype ==  'pfb') {

            $fdopt['FontFile'] =  $pfbid;
          } else  if  ($fbtype ==  'ttf') {

            $fdopt['FontFile2'] =  $pfbid;
          }

          $this->o_fontDescriptor($fontDescriptorId, 'new', $fdopt);


          // embed the font program
          $this->o_contents($this->numObj, 'new');

          $this->objects[$pfbid]['c'].=  $data;

          // determine the cruicial lengths within this file
          if  ($fbtype ==  'pfb') {

            $l1 =  strpos($data, 'eexec') +6;

            $l2 =  strpos($data, '00000000') -$l1;

            $l3 =  mb_strlen($data) -$l2-$l1;

            $this->o_contents($this->numObj, 'add', array('Length1' => $l1, 'Length2' => $l2, 'Length3' => $l3));
          } else  if  ($fbtype ==  'ttf') {

            $l1 =  mb_strlen($data);

            $this->o_contents($this->numObj, 'add', array('Length1' => $l1));
          }



          // tell the font object about all this new stuff
          $tmp =  array('BaseFont' => $adobeFontName, 'MissingWidth' => $missing_width, 'Widths' => $widthid, 'FirstChar' => $firstChar, 'LastChar' => $lastChar, 'FontDescriptor' => $fontDescriptorId);

          if  ($fbtype ==  'ttf') {

            $tmp['SubType'] =  'TrueType';
          }

          $this->addMessage('adding extra info to font.('.$fontObj.')');

          foreach($tmp as  $fk => $fv) {

            $this->addMessage($fk." : ".$fv);
          }

          $this->o_font($fontObj, 'add', $tmp);
        } else {

          $this->addMessage('selectFont: pfb or ttf file not found, ok if this is one of the 14 standard fonts');
        }



        // also set the differences here, note that this means that these will take effect only the
        //first time that a font is selected, else they are ignored
        if  (isset($options['differences'])) {

          $this->fonts[$fontName]['differences'] =  $options['differences'];
        }
      }
    }

    if  ($set &&  isset($this->fonts[$fontName])) {

      // so if for some reason the font was not set in the last one then it will not be selected
      $this->currentBaseFont =  $fontName;

      // the next lines mean that if a new font is selected, then the current text state will be
      // applied to it as well.
      $this->currentFont =  $this->currentBaseFont;

      $this->currentFontNum =  $this->fonts[$this->currentFont]['fontNum'];

      //$this->setCurrentFont();

    }

    return  $this->currentFontNum;

    //return $this->numObj;

  }


  /**
   * sets up the current font, based on the font families, and the current text state
   * note that this system is quite flexible, a bold-italic font can be completely different to a
   * italic-bold font, and even bold-bold will have to be defined within the family to have meaning
   * This function is to be called whenever the currentTextState is changed, it will update
   * the currentFont setting to whatever the appropriatte family one is.
   * If the user calls selectFont themselves then that will reset the currentBaseFont, and the currentFont
   * This function will change the currentFont to whatever it should be, but will not change the
   * currentBaseFont.
   *
   * @access private
   */
  function  setCurrentFont() {

    //   if (strlen($this->currentBaseFont) == 0){
    //     // then assume an initial font
    //     $this->selectFont('./fonts/Helvetica.afm');
    //   }
    //   $cf = substr($this->currentBaseFont,strrpos($this->currentBaseFont,'/')+1);
    //   if (strlen($this->currentTextState)
    //     && isset($this->fontFamilies[$cf])
    //       && isset($this->fontFamilies[$cf][$this->currentTextState])){
    //     // then we are in some state or another
    //     // and this font has a family, and the current setting exists within it
    //     // select the font, then return it
    //     $nf = substr($this->currentBaseFont,0,strrpos($this->currentBaseFont,'/')+1).$this->fontFamilies[$cf][$this->currentTextState];
    //     $this->selectFont($nf,'',0);
    //     $this->currentFont = $nf;
    //     $this->currentFontNum = $this->fonts[$nf]['fontNum'];
    //   } else {
    //     // the this font must not have the right family member for the current state
    //     // simply assume the base font
    $this->currentFont =  $this->currentBaseFont;

    $this->currentFontNum =  $this->fonts[$this->currentFont]['fontNum'];

    //  }

  }


  /**
   * function for the user to find out what the ID is of the first page that was created during
   * startup - useful if they wish to add something to it later.
   */
  function  getFirstPageId() {

    return  $this->firstPageId;
  }


  /**
   * add content to the currently active object
   *
   * @access private
   */
  function  addContent($content) {

    $this->objects[$this->currentContents]['c'].=  $content;
  }


  /**
   * sets the colour for fill operations
   */
  function  setColor($r, $g, $b, $force =  0) {

    if  ($r >=  0 &&  ($force ||  $r !=  $this->currentColour['r'] ||  $g !=  $this->currentColour['g'] ||  $b !=  $this->currentColour['b'])) {

      $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $r) .' '.sprintf('%.3F', $g) .' '.sprintf('%.3F', $b) .' rg';

      $this->currentColour =  array('r' => $r, 'g' => $g, 'b' => $b);
    }
  }


  /**
   * sets the colour for stroke operations
   */
  function  setStrokeColor($r, $g, $b, $force =  0) {

    if  ($r >=  0 &&  ($force ||  $r !=  $this->currentStrokeColour['r'] ||  $g !=  $this->currentStrokeColour['g'] ||  $b !=  $this->currentStrokeColour['b'])) {

      $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $r) .' '.sprintf('%.3F', $g) .' '.sprintf('%.3F', $b) .' RG';

      $this->currentStrokeColour =  array('r' => $r, 'g' => $g, 'b' => $b);
    }
  }


  /**
   * Set the graphics state for compositions
   */
  function  setGraphicsState($parameters) {

    // Create a new graphics state object
    // FIXME: should actually keep track of states that have already been created...
    $this->numObj++;

    $this->o_extGState($this->numObj,  'new',  $parameters);

    $this->objects[ $this->currentContents ]['c'].=  "\n/GS" . $this->numStates . " gs";
  }


  /**
   * Set current blend mode & opacity for lines.
   *
   * Valid blend modes are:
   *
   * Normal, Multiply, Screen, Overlay, Darken, Lighten,
   * ColorDogde, ColorBurn, HardLight, SoftLight, Difference,
   * Exclusion
   *
   * @param string $mode the blend mode to use
   * @param float $opacity 0.0 fully transparent, 1.0 fully opaque
   */
  function setLineTransparency($mode, $opacity) {
    static $blend_modes = array("Normal", "Multiply", "Screen",
                                "Overlay", "Darken", "Lighten",
                                "ColorDogde", "ColorBurn", "HardLight",
                                "SoftLight", "Difference", "Exclusion");

    if ( !in_array($mode, $blend_modes) )
      $mode = "Normal";
    
    // Only create a new graphics state if required
    if ( $mode == $this->currentLineTransparency["mode"]  &&
         $opacity == $this->currentLineTransparency["opacity"] )
      return;

    $options = array("BM" => "/$mode",
                     "CA" => (float)$opacity);

    $this->setGraphicsState($options);
  }
  
  /**
   * Set current blend mode & opacity for filled objects.
   *
   * Valid blend modes are:
   *
   * Normal, Multiply, Screen, Overlay, Darken, Lighten,
   * ColorDogde, ColorBurn, HardLight, SoftLight, Difference,
   * Exclusion
   *
   * @param string $mode the blend mode to use
   * @param float $opacity 0.0 fully transparent, 1.0 fully opaque
   */
  function setFillTransparency($mode, $opacity) {
    static $blend_modes = array("Normal", "Multiply", "Screen",
                                "Overlay", "Darken", "Lighten",
                                "ColorDogde", "ColorBurn", "HardLight",
                                "SoftLight", "Difference", "Exclusion");

    if ( !in_array($mode, $blend_modes) )
      $mode = "Normal";

    if ( $mode == $this->currentFillTransparency["mode"]  &&
         $opacity == $this->currentFillTransparency["opacity"] )
      return;

    $options = array("BM" => "/$mode",
                     "ca" => (float)$opacity);
    
    $this->setGraphicsState($options);
  }

  /**
   * draw a line from one set of coordinates to another
   */
  function  line($x1, $y1, $x2, $y2) {

    $this->objects[$this->currentContents]['c'] .=
      "\n".sprintf('%.3F', $x1) .' '.sprintf('%.3F', $y1) .' m '.sprintf('%.3F', $x2) .' '.sprintf('%.3F', $y2) .' l S';
  }


  /**
   * draw a bezier curve based on 4 control points
   */
  function  curve($x0, $y0, $x1, $y1, $x2, $y2, $x3, $y3) {

    // in the current line style, draw a bezier curve from (x0,y0) to (x3,y3) using the other two points
    // as the control points for the curve.
    $this->objects[$this->currentContents]['c'] .=
      "\n".sprintf('%.3F', $x0) .' '.sprintf('%.3F', $y0) .' m '.sprintf('%.3F', $x1) .' '.sprintf('%.3F', $y1);

    $this->objects[$this->currentContents]['c'] .=
      ' '.sprintf('%.3F', $x2) .' '.sprintf('%.3F', $y2) .' '.sprintf('%.3F', $x3) .' '.sprintf('%.3F', $y3) .' c S';
  }


  /**
   * draw a part of an ellipse
   */
  function  partEllipse($x0, $y0, $astart, $afinish, $r1, $r2 =  0, $angle =  0, $nSeg =  8) {

    $this->ellipse($x0, $y0, $r1, $r2, $angle, $nSeg, $astart, $afinish, 0);
  }


  /**
   * draw a filled ellipse
   */
  function  filledEllipse($x0, $y0, $r1, $r2 =  0, $angle =  0, $nSeg =  8, $astart =  0, $afinish =  360) {

    return  $this->ellipse($x0, $y0, $r1, $r2 =  0, $angle, $nSeg, $astart, $afinish, 1, 1);
  }


  /**
   * draw an ellipse
   * note that the part and filled ellipse are just special cases of this function
   *
   * draws an ellipse in the current line style
   * centered at $x0,$y0, radii $r1,$r2
   * if $r2 is not set, then a circle is drawn
   * nSeg is not allowed to be less than 2, as this will simply draw a line (and will even draw a
   * pretty crappy shape at 2, as we are approximating with bezier curves.
   */
  function  ellipse($x0, $y0, $r1, $r2 =  0, $angle =  0, $nSeg =  8, $astart =  0, $afinish =  360, $close =  1, $fill =  0) {

    if  ($r1 ==  0) {
      return;
    }

    if  ($r2 ==  0) {
      $r2 =  $r1;
    }

    if  ($nSeg < 2) {
      $nSeg =  2;
    }


    $astart =  deg2rad((float)$astart);

    $afinish =  deg2rad((float)$afinish);

    $totalAngle = $afinish-$astart;


    $dt =  $totalAngle/$nSeg;

    $dtm =  $dt/3;


    if  ($angle !=  0) {

      $a =  -1*deg2rad((float)$angle);

      $tmp  =  "\n q ";
      $tmp .=  sprintf('%.3F', cos($a)) .' '.sprintf('%.3F', (-1.0*sin($a))) .' '.sprintf('%.3F', sin($a)) .' '.sprintf('%.3F', cos($a)) .' ';
      $tmp .=  sprintf('%.3F', $x0) .' '.sprintf('%.3F', $y0) .' cm';

      $this->objects[$this->currentContents]['c'].=  $tmp;

      $x0 =  0;
      $y0 =  0;
    }


    $t1 =  $astart;
    $a0 =  $x0 + $r1*cos($t1);
    $b0 =  $y0 + $r2*sin($t1);
    $c0 =  -$r1 * sin($t1);
    $d0 =  $r2 * cos($t1);


    $this->objects[$this->currentContents]['c'] .=  "\n".sprintf('%.3F', $a0) .' '.sprintf('%.3F', $b0) .' m ';

    for  ($i = 1; $i <=  $nSeg; $i++) {

      // draw this bit of the total curve
      $t1 =  $i * $dt + $astart;

      $a1 =  $x0 + $r1 * cos($t1);

      $b1 =  $y0 + $r2 * sin($t1);

      $c1 = -$r1 * sin($t1);

      $d1 =  $r2 * cos($t1);

      $this->objects[$this->currentContents]['c']
        .=  "\n".sprintf('%.3F', ($a0+$c0*$dtm)) .' '.sprintf('%.3F', ($b0 + $d0 * $dtm));

      $this->objects[$this->currentContents]['c'] .=
        ' '.sprintf('%.3F', ($a1-$c1*$dtm)) .' '.sprintf('%.3F', ($b1-$d1*$dtm)) .' '.sprintf('%.3F', $a1) .' '.sprintf('%.3F', $b1) .' c';

      $a0 =  $a1;

      $b0 =  $b1;

      $c0 =  $c1;

      $d0 =  $d1;
    }

    if  ($fill) {
      $this->objects[$this->currentContents]['c'].=  ' f';

    } else if ($close) {

        $this->objects[$this->currentContents]['c'].=  ' s';
        // small 's' signifies closing the path as well

    } else {

      $this->objects[$this->currentContents]['c'].=  ' S';

    }

    if  ($angle !=  0) {
      $this->objects[$this->currentContents]['c'].=  ' Q';
    }

  }


  /**
   * this sets the line drawing style.
   * width, is the thickness of the line in user units
   * cap is the type of cap to put on the line, values can be 'butt','round','square'
   *    where the diffference between 'square' and 'butt' is that 'square' projects a flat end past the
   *    end of the line.
   * join can be 'miter', 'round', 'bevel'
   * dash is an array which sets the dash pattern, is a series of length values, which are the lengths of the
   *   on and off dashes.
   *   (2) represents 2 on, 2 off, 2 on , 2 off ...
   *   (2,1) is 2 on, 1 off, 2 on, 1 off.. etc
   * phase is a modifier on the dash pattern which is used to shift the point at which the pattern starts.
   */
  function  setLineStyle($width =  1, $cap =  '', $join =  '', $dash =  '', $phase =  0) {


    // this is quite inefficient in that it sets all the parameters whenever 1 is changed, but will fix another day
    $string =  '';

    if  ($width>0) {

      $string.=  $width.' w';
    }

    $ca =  array('butt' => 0, 'round' => 1, 'square' => 2);

    if  (isset($ca[$cap])) {

      $string.=  ' '.$ca[$cap].' J';
    }

    $ja =  array('miter' => 0, 'round' => 1, 'bevel' => 2);

    if  (isset($ja[$join])) {

      $string.=  ' '.$ja[$join].' j';
    }

    if  (is_array($dash)) {

      $string.=  ' [';

      foreach ($dash as  $len) {

        $string.=  ' '.$len;
      }

      $string.=  ' ] '.$phase.' d';
    }

    $this->currentLineStyle =  $string;

    $this->objects[$this->currentContents]['c'].=  "\n".$string;
  }



  /**
   * draw a polygon, the syntax for this is similar to the GD polygon command
   */
  function  polygon($p, $np, $f =  0) {

    $this->objects[$this->currentContents]['c'].=  "\n";

    $this->objects[$this->currentContents]['c'].=  sprintf('%.3F', $p[0]) .' '.sprintf('%.3F', $p[1]) .' m ';

    for  ($i =  2; $i < $np * 2; $i =  $i + 2) {

      $this->objects[$this->currentContents]['c'].=  sprintf('%.3F', $p[$i]) .' '.sprintf('%.3F', $p[$i+1]) .' l ';
    }

    if  ($f ==  1) {

      $this->objects[$this->currentContents]['c'].=  ' f';
    } else {

      $this->objects[$this->currentContents]['c'].=  ' S';
    }
  }


  /**
   * a filled rectangle, note that it is the width and height of the rectangle which are the secondary paramaters, not
   * the coordinates of the upper-right corner
   */
  function  filledRectangle($x1, $y1, $width, $height) {

    $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $x1) .' '.sprintf('%.3F', $y1) .' '.sprintf('%.3F', $width) .' '.sprintf('%.3F', $height) .' re f';
  }


  /**
   * draw a rectangle, note that it is the width and height of the rectangle which are the secondary paramaters, not
   * the coordinates of the upper-right corner
   */
  function  rectangle($x1, $y1, $width, $height) {

    $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $x1) .' '.sprintf('%.3F', $y1) .' '.sprintf('%.3F', $width) .' '.sprintf('%.3F', $height) .' re S';
  }


  /**
   * add a new page to the document
   * this also makes the new page the current active object
   */
  function  newPage($insert =  0, $id =  0, $pos =  'after') {


    // if there is a state saved, then go up the stack closing them
    // then on the new page, re-open them with the right setings

    if  ($this->nStateStack) {

      for  ($i =  $this->nStateStack;$i >=  1;$i--) {

        $this->restoreState($i);
      }
    }


    $this->numObj++;

    if  ($insert) {

      // the id from the ezPdf class is the od of the contents of the page, not the page object itself
      // query that object to find the parent
      $rid =  $this->objects[$id]['onPage'];

      $opt =  array('rid' => $rid, 'pos' => $pos);

      $this->o_page($this->numObj, 'new', $opt);
    } else {

      $this->o_page($this->numObj, 'new');
    }

    // if there is a stack saved, then put that onto the page
    if  ($this->nStateStack) {

      for  ($i =  1;$i <=  $this->nStateStack;$i++) {

        $this->saveState($i);
      }
    }

    // and if there has been a stroke or fill colour set, then transfer them
    if  ($this->currentColour['r'] >=  0) {

      $this->setColor($this->currentColour['r'], $this->currentColour['g'], $this->currentColour['b'], 1);
    }

    if  ($this->currentStrokeColour['r'] >=  0) {

      $this->setStrokeColor($this->currentStrokeColour['r'], $this->currentStrokeColour['g'], $this->currentStrokeColour['b'], 1);
    }


    // if there is a line style set, then put this in too
    if  (mb_strlen($this->currentLineStyle)) {

      $this->objects[$this->currentContents]['c'].=  "\n".$this->currentLineStyle;
    }


    // the call to the o_page object set currentContents to the present page, so this can be returned as the page id
    return  $this->currentContents;
  }


  /**
   * output the pdf code, streaming it to the browser
   * the relevant headers are set so that hopefully the browser will recognise it
   */
  function  stream($options =  '') {

    // setting the options allows the adjustment of the headers
    // values at the moment are:
    // 'Content-Disposition' => 'filename'  - sets the filename, though not too sure how well this will
    //        work as in my trial the browser seems to use the filename of the php file with .pdf on the end
    // 'Accept-Ranges' => 1 or 0 - if this is not set to 1, then this header is not included, off by default
    //    this header seems to have caused some problems despite tha fact that it is supposed to solve
    //    them, so I am leaving it off by default.
    // 'compress' = > 1 or 0 - apply content stream compression, this is on (1) by default
    // 'Attachment' => 1 or 0 - if 1, force the browser to open a download dialog
    if  (!is_array($options)) {

      $options =  array();
    }

    if  ( headers_sent())
      die("Unable to stream pdf: headers already sent");


    if  ( isset($options['compress']) &&  $options['compress'] ==  0) {

      $tmp =  ltrim($this->output(1));
    } else {

      $tmp =  ltrim($this->output());
    }


    header("Cache-Control: private");

    header("Content-type: application/pdf");

    //FIXME: I don't know that this is sufficient for determining content length (i.e. what about transport compression?)
    //header("Content-Length: " . mb_strlen($tmp));
    $fileName =  (isset($options['Content-Disposition']) ?  $options['Content-Disposition'] :  'file.pdf');

    if  ( !isset($options["Attachment"]))
      $options["Attachment"] =  true;


    $attachment =  $options["Attachment"] ?  "attachment" :  "inline";


    header("Content-Disposition: $attachment; filename=\"$fileName\"");


    if  (isset($options['Accept-Ranges']) &&  $options['Accept-Ranges'] ==  1) {
      //FIXME: Is this the correct value ... spec says 1#range-unit
      header("Accept-Ranges: " . mb_strlen($tmp));
    }

    echo  $tmp;

    flush();
  }


  /**
   * return the height in units of the current font in the given size
   */
  function  getFontHeight($size) {

    if  (!$this->numFonts) {
      $this->selectFont('./fonts/Helvetica');
    }
    
    // for the current font, and the given size, what is the height of the font in user units
    $h =  $this->fonts[$this->currentFont]['FontBBox'][3]-$this->fonts[$this->currentFont]['FontBBox'][1];

    // have to adjust by a font offset for Windows fonts.  unfortunately it looks like
    // the bounding box calculations are wrong and I don't know why.
    if (isset($this->fonts[$this->currentFont]['FontHeightOffset'])) {

      // For CourierNew from Windows this needs to be -646 to match the
      // Adobe native Courier font.
      //
      // For FreeMono from GNU this needs to be -337 to match the
      // Courier font.
      //
      // Both have been added manually to the .afm and .ufm files.
      $h += (int)$this->fonts[$this->currentFont]['FontHeightOffset'];
    }

    return  $size*$h/1000;
  }


  /**
   * return the font descender, this will normally return a negative number
   * if you add this number to the baseline, you get the level of the bottom of the font
   * it is in the pdf user units
   */
  function  getFontDescender($size) {

    // note that this will most likely return a negative value
    if  (!$this->numFonts) {
      $this->selectFont('./fonts/Helvetica');
    }

    //$h = $this->fonts[$this->currentFont]['FontBBox'][1];
    $h = $this->fonts[$this->currentFont]['Descender'];

    return  $size*$h/1000;
  }


  /**
   * filter the text, this is applied to all text just before being inserted into the pdf document
   * it escapes the various things that need to be escaped, and so on
   *
   * @access private
   */
  function  filterText($text, $bom = true) {
    if ($this->isUnicode) {
      $text = html_entity_decode($text, ENT_QUOTES, 'UTF-8');
      $text =  $this->utf8toUtf16BE($text, $bom);
    } else {
      if (in_array('Windows-1252', mb_list_encodings())) {
        $text = mb_convert_encoding($text, 'Windows-1252', 'UTF-8');
      } else {
        $text = mb_convert_encoding($text, 'iso-8859-1', 'UTF-8');
      }
      $text = html_entity_decode($text, ENT_QUOTES);
    }

    // the chr(13) substitution fixes a bug seen in TCPDF (bug #1421290)
    $text = strtr($text, array(')' => '\\)', '(' => '\\(', '\\' => '\\\\', chr(13) => '\r'));
    return  $text;
  }

  /**
   * return array containing codepoints (UTF-8 character values) for the
   * string passed in.
   *
   * based on the excellent TCPDF code by Nicola Asuni and the
   * RFC for UTF-8 at http://www.faqs.org/rfcs/rfc3629.html
   *
   * @access private
   * @author Orion Richardson
   * @since January 5, 2008
   * @param string $text UTF-8 string to process
   * @return array UTF-8 codepoints array for the string
   */
  function  utf8toCodePointsArray(&$text) {
    $length = mb_strlen($text,'8bit'); // http://www.php.net/manual/en/function.mb-strlen.php#77040
    $unicode = array(); // array containing unicode values
    $bytes = array(); // array containing single character byte sequences
    $numbytes = 1; // number of octetc needed to represent the UTF-8 character
    
    for ($i = 0; $i < $length; $i++) {
      $c = ord($text{$i}); // get one string character at time
      if (count($bytes) == 0) { // get starting octect
        if ($c <= 0x7F) {
          $unicode[] = $c; // use the character "as is" because is ASCII
          $numbytes = 1;
        } elseif (($c >> 0x05) == 0x06) { // 2 bytes character (0x06 = 110 BIN)
          $bytes[] = ($c - 0xC0) << 0x06;
          $numbytes = 2;
        } elseif (($c >> 0x04) == 0x0E) { // 3 bytes character (0x0E = 1110 BIN)
          $bytes[] = ($c - 0xE0) << 0x0C;
          $numbytes = 3;
        } elseif (($c >> 0x03) == 0x1E) { // 4 bytes character (0x1E = 11110 BIN)
          $bytes[] = ($c - 0xF0) << 0x12;
          $numbytes = 4;
        } else {
          // use replacement character for other invalid sequences
          $unicode[] = 0xFFFD;
          $bytes = array();
          $numbytes = 1;
        }
      } elseif (($c >> 0x06) == 0x02) { // bytes 2, 3 and 4 must start with 0x02 = 10 BIN
        $bytes[] = $c - 0x80;
        if (count($bytes) == $numbytes) {
          // compose UTF-8 bytes to a single unicode value
          $c = $bytes[0];
          for ($j = 1; $j < $numbytes; $j++) {
            $c += ($bytes[$j] << (($numbytes - $j - 1) * 0x06));
          }
          if ((($c >= 0xD800) AND ($c <= 0xDFFF)) OR ($c >= 0x10FFFF)) {
            // The definition of UTF-8 prohibits encoding character numbers between
            // U+D800 and U+DFFF, which are reserved for use with the UTF-16
            // encoding form (as surrogate pairs) and do not directly represent
            // characters.
            $unicode[] = 0xFFFD; // use replacement character
          } else {
            $unicode[] = $c; // add char to array
          }
          // reset data for next char
          $bytes = array();
          $numbytes = 1;
        }
      } else {
        // use replacement character for other invalid sequences
        $unicode[] = 0xFFFD;
        $bytes = array();
        $numbytes = 1;
      }
    }
    return $unicode;
  }

  /**
   * convert UTF-8 to UTF-16 with an additional byte order marker
   * at the front if required.
   *
   * based on the excellent TCPDF code by Nicola Asuni and the
   * RFC for UTF-8 at http://www.faqs.org/rfcs/rfc3629.html
   *
   * @access private
   * @author Orion Richardson
   * @since January 5, 2008
   * @param string $text UTF-8 string to process
   * @param boolean $bom whether to add the byte order marker
   * @return string UTF-16 result string
   */
  function  utf8toUtf16BE(&$text, $bom = true) {
    if (!$this->isUnicode) return $text;
    $out = $bom ? "\xFE\xFF" : '';
    
    $unicode = $this->utf8toCodePointsArray($text);
    foreach ($unicode as $c) {
      if ($c == 0xFFFD) {
        $out .= "\xFF\xFD"; // replacement character
      } elseif ($c < 0x10000) {
        $out .= chr($c >> 0x08);
        $out .= chr($c & 0xFF);
       } else {
        $c -= 0x10000;
        $w1 = 0xD800 | ($c >> 0x10);
        $w2 = 0xDC00 | ($c & 0x3FF);
        $out .= chr($w1 >> 0x08);
        $out .= chr($w1 & 0xFF);
        $out .= chr($w2 >> 0x08);
        $out .= chr($w2 & 0xFF);
      }
    }
    return $out;
  }


  /**
   * given a start position and information about how text is to be laid out, calculate where
   * on the page the text will end
   *
   * @access private
   */
  function  PRVTgetTextPosition($x, $y, $angle, $size, $wa, $text) {

    // given this information return an array containing x and y for the end position as elements 0 and 1
    $w =  $this->getTextWidth($size, $text);

    // need to adjust for the number of spaces in this text
    $words =  explode(' ', $text);

    $nspaces =  count($words) -1;

    $w+=  $wa*$nspaces;

    $a =  deg2rad((float)$angle);

    return  array(cos($a) *$w+$x, -sin($a) *$w+$y);
  }


  /**
   * wrapper function for PRVTcheckTextDirective1
   *
   * @access private
   */
  function  PRVTcheckTextDirective(&$text, $i, &$f) {

    return  0;

    $x =  0;

    $y =  0;

    return  $this->PRVTcheckTextDirective1($text, $i, $f, 0, $x, $y);
  }


  /**
   * checks if the text stream contains a control directive
   * if so then makes some changes and returns the number of characters involved in the directive
   * this has been re-worked to include everything neccesary to fins the current writing point, so that
   * the location can be sent to the callback function if required
   * if the directive does not require a font change, then $f should be set to 0
   *
   * @access private
   */
  function  PRVTcheckTextDirective1(&$text, $i, &$f, $final, &$x, &$y, $size =  0, $angle =  0, $wordSpaceAdjust =  0) {

    return  0;

    $directive =  0;

    $j =  $i;

    if  ($text[$j] ==  '<') {

      $j++;

      switch ($text[$j]) {

      case  '/':

        $j++;

        if  (mb_strlen($text) <=  $j) {

          return  $directive;
        }

        switch ($text[$j]) {

        case  'b':

        case  'i':

          $j++;

          if  ($text[$j] ==  '>') {

            $p =  mb_strrpos($this->currentTextState, $text[$j-1]);

            if  ($p !==  false) {

              // then there is one to remove
              $this->currentTextState =  mb_substr($this->currentTextState, 0, $p) .substr($this->currentTextState, $p+1);
            }

            $directive =  $j-$i+1;
          }

          break;

        case  'c':

          // this this might be a callback function
          $j++;

          $k =  mb_strpos($text, '>', $j);

          if  ($k !==  false &&  $text[$j] ==  ':') {

            // then this will be treated as a callback directive
            $directive =  $k-$i+1;

            $f =  0;

            // split the remainder on colons to get the function name and the paramater
            $tmp =  mb_substr($text, $j+1, $k-$j-1);

            $b1 =  mb_strpos($tmp, ':');

            if  ($b1 !==  false) {

              $func =  mb_substr($tmp, 0, $b1);

              $parm =  mb_substr($tmp, $b1+1);
            } else {

              $func =  $tmp;

              $parm =  '';
            }

            if  (!isset($func) ||  !mb_strlen(trim($func))) {

              $directive =  0;
            } else {

              // only call the function if this is the final call
              if  ($final) {

                // need to assess the text position, calculate the text width to this point
                // can use getTextWidth to find the text width I think
                $tmp =  $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, mb_substr($text, 0, $i));

                $info =  array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'end', 'p' => $parm, 'nCallback' => $this->nCallback);

                $x =  $tmp[0];

                $y =  $tmp[1];

                $ret =  $this->$func($info);

                if  (is_array($ret)) {

                  // then the return from the callback function could set the position, to start with, later will do font colour, and font
                  foreach($ret as  $rk => $rv) {

                    switch ($rk) {

                    case  'x':

                    case  'y':

                      $$rk =  $rv;

                      break;
                    }
                  }
                }

                // also remove from to the stack
                // for simplicity, just take from the end, fix this another day
                $this->nCallback--;

                if  ($this->nCallback<0) {

                  $this->nCallBack =  0;
                }
              }
            }
          }

          break;
        }

        break;

      case  'b':

      case  'i':

        $j++;

        if  ($text[$j] ==  '>') {

          $this->currentTextState.=  $text[$j-1];

          $directive =  $j-$i+1;
        }

        break;

      case  'C':

        $noClose =  1;

      case  'c':

        // this this might be a callback function
        $j++;

        $k =  mb_strpos($text, '>', $j);

        if  ($k !==  false &&  $text[$j] ==  ':') {

          // then this will be treated as a callback directive
          $directive =  $k-$i+1;

          $f =  0;

          // split the remainder on colons to get the function name and the paramater
          //          $bits = explode(':',substr($text,$j+1,$k-$j-1));
          $tmp =  mb_substr($text, $j+1, $k-$j-1);

          $b1 =  mb_strpos($tmp, ':');

          if  ($b1 !==  false) {

            $func =  mb_substr($tmp, 0, $b1);

            $parm =  mb_substr($tmp, $b1+1);
          } else {

            $func =  $tmp;

            $parm =  '';
          }

          if  (!isset($func) ||  !mb_strlen(trim($func))) {

            $directive =  0;
          } else {

            // only call the function if this is the final call, ie, the one actually doing printing, not measurement
            if  ($final) {

              // need to assess the text position, calculate the text width to this point
              // can use getTextWidth to find the text width I think
              // also add the text height and descender
              $tmp =  $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, mb_substr($text, 0, $i));

              $info =  array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'start', 'p' => $parm, 'f' => $func, 'height' => $this->getFontHeight($size), 'descender' => $this->getFontDescender($size));

              $x =  $tmp[0];

              $y =  $tmp[1];

              if  (!isset($noClose) ||  !$noClose) {

                // only add to the stack if this is a small 'c', therefore is a start-stop pair
                $this->nCallback++;

                $info['nCallback'] =  $this->nCallback;

                $this->callback[$this->nCallback] =  $info;
              }

              $ret =  $this->$func($info);

              if  (is_array($ret)) {

                // then the return from the callback function could set the position, to start with, later will do font colour, and font
                foreach($ret as  $rk => $rv) {

                  switch ($rk) {

                  case  'x':

                  case  'y':

                    $$rk =  $rv;

                    break;
                  }
                }
              }
            }
          }
        }

        break;
      }
    }

    return  $directive;
  }


  /**
   * add text to the document, at a specified location, size and angle on the page
   */
  function  addText($x, $y, $size, $text, $angle =  0, $wordSpaceAdjust =  0) {
    if  (!$this->numFonts) {
      $this->selectFont('./fonts/Helvetica');
    }


    // if there are any open callbacks, then they should be called, to show the start of the line
    if  ($this->nCallback>0) {

      for  ($i =  $this->nCallback;$i>0;$i--) {

        // call each function
        $info =  array('x' => $x,
                       'y' => $y,
                       'angle' => $angle,
                       'status' => 'sol',
                       'p' => $this->callback[$i]['p'],
                       'nCallback' => $this->callback[$i]['nCallback'],
                       'height' => $this->callback[$i]['height'],
                       'descender' => $this->callback[$i]['descender']);

        $func =  $this->callback[$i]['f'];

        $this->$func($info);
      }
    }

    if  ($angle ==  0) {

      $this->objects[$this->currentContents]['c'].=  "\n".'BT '.sprintf('%.3F', $x) .' '.sprintf('%.3F', $y) .' Td';

    } else {

      $a =  deg2rad((float)$angle);

      $tmp =  "\n".'BT ';

      $tmp.=  sprintf('%.3F', cos($a)) .' '.sprintf('%.3F', (-1.0*sin($a))) .' '.sprintf('%.3F', sin($a)) .' '.sprintf('%.3F', cos($a)) .' ';

      $tmp.=  sprintf('%.3F', $x) .' '.sprintf('%.3F', $y) .' Tm';

      $this->objects[$this->currentContents]['c'].=  $tmp;
    }

    if  ($wordSpaceAdjust !=  0 ||  $wordSpaceAdjust !=  $this->wordSpaceAdjust) {

      $this->wordSpaceAdjust =  $wordSpaceAdjust;

      $this->objects[$this->currentContents]['c'].=  ' '.sprintf('%.3F', $wordSpaceAdjust) .' Tw';
    }

    $len =  mb_strlen($text);

    $start =  0;

    /*
     for ($i = 0;$i<$len;$i++){
     $f = 1;
     $directive = 0; //$this->PRVTcheckTextDirective($text,$i,$f);
     if ($directive){
     // then we should write what we need to
     if ($i>$start){
     $part = mb_substr($text,$start,$i-$start);
     $this->objects[$this->currentContents]['c'] .= ' /F'.$this->currentFontNum.' '.sprintf('%.1F',$size).' Tf ';
     $this->objects[$this->currentContents]['c'] .= ' ('.$this->filterText($part, false).') Tj';
     }
     if ($f){
     // then there was nothing drastic done here, restore the contents
     $this->setCurrentFont();
     } else {
     $this->objects[$this->currentContents]['c'] .= ' ET';
     $f = 1;
     $xp = $x;
     $yp = $y;
     $directive = 0; //$this->PRVTcheckTextDirective1($text,$i,$f,1,$xp,$yp,$size,$angle,$wordSpaceAdjust);

     // restart the text object
     if ($angle == 0){
     $this->objects[$this->currentContents]['c'] .= "\n".'BT '.sprintf('%.3F',$xp).' '.sprintf('%.3F',$yp).' Td';
     } else {
     $a = deg2rad((float)$angle);
     $tmp = "\n".'BT ';
     $tmp .= sprintf('%.3F',cos($a)).' '.sprintf('%.3F',(-1.0*sin($a))).' '.sprintf('%.3F',sin($a)).' '.sprintf('%.3F',cos($a)).' ';
     $tmp .= sprintf('%.3F',$xp).' '.sprintf('%.3F',$yp).' Tm';
     $this->objects[$this->currentContents]['c'] .= $tmp;
     }
     if ($wordSpaceAdjust != 0 || $wordSpaceAdjust != $this->wordSpaceAdjust){
     $this->wordSpaceAdjust = $wordSpaceAdjust;
     $this->objects[$this->currentContents]['c'] .= ' '.sprintf('%.3F',$wordSpaceAdjust).' Tw';
     }
     }
     // and move the writing point to the next piece of text
     $i = $i+$directive-1;
     $start = $i+1;
     }

     }
    */
    if  ($start < $len) {

      $part =  $text; // OAR - Don't need this anymore, given that $start always equals zero.  substr($text, $start);

      $this->objects[$this->currentContents]['c'].=  ' /F'.$this->currentFontNum.' '.sprintf('%.1F', $size) .' Tf ';

      $this->objects[$this->currentContents]['c'].=  ' ('.$this->filterText($part, false) .') Tj';
    }

    $this->objects[$this->currentContents]['c'].=  ' ET';


    // if there are any open callbacks, then they should be called, to show the end of the line
    if  ($this->nCallback>0) {

      for  ($i =  $this->nCallback;$i>0;$i--) {

        // call each function
        $tmp =  $this->PRVTgetTextPosition($x, $y, $angle, $size, $wordSpaceAdjust, $text);

        $info =  array('x' => $tmp[0], 'y' => $tmp[1], 'angle' => $angle, 'status' => 'eol', 'p' => $this->callback[$i]['p'], 'nCallback' => $this->callback[$i]['nCallback'], 'height' => $this->callback[$i]['height'], 'descender' => $this->callback[$i]['descender']);

        $func =  $this->callback[$i]['f'];

        $this->$func($info);
      }
    }
  }


  /**
   * calculate how wide a given text string will be on a page, at a given size.
   * this can be called externally, but is alse used by the other class functions
   */
  function  getTextWidth($size, $text, $spacing =  0) {

    // this function should not change any of the settings, though it will need to
    // track any directives which change during calculation, so copy them at the start
    // and put them back at the end.
    $store_currentTextState =  $this->currentTextState;


    if  (!$this->numFonts) {
      $this->selectFont('./fonts/Helvetica');
    }


    // converts a number or a float to a string so it can get the width
    $text =  "$text";

    // hmm, this is where it all starts to get tricky - use the font information to
    // calculate the width of each character, add them up and convert to user units
    $w =  0;

    $cf =  $this->currentFont;

    $space_scale =  1000 / $size;

    if ( $this->isUnicode) {
      // for Unicode, use the code points array to calculate width rather
      // than just the string itself
      $unicode =  $this->utf8toCodePointsArray($text);

      foreach ($unicode as $char) {
        // check if we have to replace character
      if  ( isset($this->fonts[$cf]['differences'][$char])) {
          $char =  $this->fonts[$cf]['differences'][$char];
        }
        // add the character width
        if  ( isset($this->fonts[$cf]['C'][$char]['WX'])) {
          $w+=  $this->fonts[$cf]['C'][$char]['WX'];
        }
        // add additional padding for space
        if  ( $char ==  32) {  // Space
          $w+=  $spacing * $space_scale;
        }
      }

    } else {

      $len =  mb_strlen($text);

      for  ($i =  0; $i < $len; $i++) {
        $char =  ord($text{$i});
        // check if we have to replace character
        if  ( isset($this->fonts[$cf]['differences'][$char])) {
          $char =  $this->fonts[$cf]['differences'][$char];
        }
        // add the character width
        if  ( isset($this->fonts[$cf]['C'][$char]['WX'])) {
        $w+=  $this->fonts[$cf]['C'][$char]['WX'];
        }
        // add additional padding for space
        if  ( $char ==  32) {  // Space
        $w+=  $spacing * $space_scale;
    }
      }
    }


    $this->currentTextState =  $store_currentTextState;

    $this->setCurrentFont();


    return  $w*$size/1000;
  }


  /**
   * do a part of the calculation for sorting out the justification of the text
   *
   * @access private
   */
  function  PRVTadjustWrapText($text, $actual, $width, &$x, &$adjust, $justification) {

    switch  ($justification) {

    case  'left':

      return;

      break;

    case  'right':

      $x+=  $width-$actual;

      break;

    case  'center':

    case  'centre':

      $x+=  ($width-$actual) /2;

      break;

    case  'full':

      // count the number of words
      $words =  explode(' ', $text);

      $nspaces =  count($words) -1;

      if  ($nspaces>0) {

        $adjust =  ($width-$actual) /$nspaces;
      } else {

        $adjust =  0;
      }

      break;
    }
  }


  /**
   * add text to the page, but ensure that it fits within a certain width
   * if it does not fit then put in as much as possible, splitting at word boundaries
   * and return the remainder.
   * justification and angle can also be specified for the text
   */
  function  addTextWrap($x, $y, $width, $size, $text, $justification =  'left', $angle =  0, $test =  0) {
  	// TODO - need to support Unicode
    if ($this->isUnicode) {
        die("addTextWrap does not support Unicode yet!");
    }

    // this will display the text, and if it goes beyond the width $width, will backtrack to the
    // previous space or hyphen, and return the remainder of the text.

    // $justification can be set to 'left','right','center','centre','full'

    // need to store the initial text state, as this will change during the width calculation
    // but will need to be re-set before printing, so that the chars work out right
    $store_currentTextState =  $this->currentTextState;


    if  (!$this->numFonts) {
      $this->selectFont('./fonts/Helvetica');
    }

    if  ($width <=  0) {

      // error, pretend it printed ok, otherwise risking a loop
      return  '';
    }

    $w =  0;

    $break =  0;

    $breakWidth =  0;

    $len =  mb_strlen($text);

    $cf =  $this->currentFont;

    $tw =  $width/$size*1000;

    for  ($i =  0;$i<$len;$i++) {

      $f =  1;

      $directive =  0;
      //$this->PRVTcheckTextDirective($text,$i,$f);
      if  ($directive) {

        if  ($f) {

          $this->setCurrentFont();

          $cf =  $this->currentFont;
        }

        $i =  $i+$directive-1;
      } else {

        $cOrd =  ord($text[$i]);

        if  (isset($this->fonts[$cf]['differences'][$cOrd])) {

          // then this character is being replaced by another
          $cOrd2 =  $this->fonts[$cf]['differences'][$cOrd];
        } else {

          $cOrd2 =  $cOrd;
        }


        if  (isset($this->fonts[$cf]['C'][$cOrd2]['WX'])) {

          $w+=  $this->fonts[$cf]['C'][$cOrd2]['WX'];
        }

        if  ($w>$tw) {

          // then we need to truncate this line
          if  ($break>0) {

            // then we have somewhere that we can split :)
            if  ($text[$break] ==  ' ') {

              $tmp =  mb_substr($text, 0, $break);
            } else {

              $tmp =  mb_substr($text, 0, $break+1);
            }

            $adjust =  0;

            $this->PRVTadjustWrapText($tmp, $breakWidth, $width, $x, $adjust, $justification);


            // reset the text state
            $this->currentTextState =  $store_currentTextState;

            $this->setCurrentFont();

            if  (!$test) {

              $this->addText($x, $y, $size, $tmp, $angle, $adjust);
            }

            return  mb_substr($text, $break+1);
          } else {

            // just split before the current character
            $tmp =  mb_substr($text, 0, $i);

            $adjust =  0;

            $ctmp =  ord($text[$i]);

            if  (isset($this->fonts[$cf]['differences'][$ctmp])) {

              $ctmp =  $this->fonts[$cf]['differences'][$ctmp];
            }

            $tmpw =  ($w-$this->fonts[$cf]['C'][$ctmp]['WX']) *$size/1000;

            $this->PRVTadjustWrapText($tmp, $tmpw, $width, $x, $adjust, $justification);

            // reset the text state
            $this->currentTextState =  $store_currentTextState;

            $this->setCurrentFont();

            if  (!$test) {

              $this->addText($x, $y, $size, $tmp, $angle, $adjust);
            }

            return  mb_substr($text, $i);
          }
        }

        if  ($text[$i] ==  '-') {

          $break =  $i;

          $breakWidth =  $w*$size/1000;
        }

        if  ($text[$i] ==  ' ') {

          $break =  $i;

          $ctmp =  ord($text[$i]);

          if  (isset($this->fonts[$cf]['differences'][$ctmp])) {

            $ctmp =  $this->fonts[$cf]['differences'][$ctmp];
          }

          $breakWidth =  ($w-$this->fonts[$cf]['C'][$ctmp]['WX']) *$size/1000;
        }
      }
    }

    // then there was no need to break this line
    if  ($justification ==  'full') {

      $justification =  'left';
    }

    $adjust =  0;

    $tmpw =  $w*$size/1000;

    $this->PRVTadjustWrapText($text, $tmpw, $width, $x, $adjust, $justification);

    // reset the text state
    $this->currentTextState =  $store_currentTextState;

    $this->setCurrentFont();

    if  (!$test) {

      $this->addText($x, $y, $size, $text, $angle, $adjust, $angle);
    }

    return  '';
  }


  /**
   * this will be called at a new page to return the state to what it was on the
   * end of the previous page, before the stack was closed down
   * This is to get around not being able to have open 'q' across pages
   *
   */
  function  saveState($pageEnd =  0) {

    if  ($pageEnd) {

      // this will be called at a new page to return the state to what it was on the
      // end of the previous page, before the stack was closed down
      // This is to get around not being able to have open 'q' across pages
      $opt =  $this->stateStack[$pageEnd];
      // ok to use this as stack starts numbering at 1
      $this->setColor($opt['col']['r'], $opt['col']['g'], $opt['col']['b'], 1);

      $this->setStrokeColor($opt['str']['r'], $opt['str']['g'], $opt['str']['b'], 1);

      $this->objects[$this->currentContents]['c'].=  "\n".$opt['lin'];

      //    $this->currentLineStyle = $opt['lin'];

    } else {

      $this->nStateStack++;

      $this->stateStack[$this->nStateStack] =  array(
                                                     'col' => $this->currentColour, 'str' => $this->currentStrokeColour, 'lin' => $this->currentLineStyle);
    }

    $this->objects[$this->currentContents]['c'].=  "\nq";
  }


  /**
   * restore a previously saved state
   */
  function  restoreState($pageEnd =  0) {

    if  (!$pageEnd) {

      $n =  $this->nStateStack;

      $this->currentColour =  $this->stateStack[$n]['col'];

      $this->currentStrokeColour =  $this->stateStack[$n]['str'];

      $this->objects[$this->currentContents]['c'].=  "\n".$this->stateStack[$n]['lin'];

      $this->currentLineStyle =  $this->stateStack[$n]['lin'];

      unset($this->stateStack[$n]);

      $this->nStateStack--;
    }

    $this->objects[$this->currentContents]['c'].=  "\nQ";
  }


  /**
   * make a loose object, the output will go into this object, until it is closed, then will revert to
   * the current one.
   * this object will not appear until it is included within a page.
   * the function will return the object number
   */
  function  openObject() {

    $this->nStack++;

    $this->stack[$this->nStack] =  array('c' => $this->currentContents, 'p' => $this->currentPage);

    // add a new object of the content type, to hold the data flow
    $this->numObj++;

    $this->o_contents($this->numObj, 'new');

    $this->currentContents =  $this->numObj;

    $this->looseObjects[$this->numObj] =  1;


    return  $this->numObj;
  }


  /**
   * open an existing object for editing
   */
  function  reopenObject($id) {

    $this->nStack++;

    $this->stack[$this->nStack] =  array('c' => $this->currentContents, 'p' => $this->currentPage);

    $this->currentContents =  $id;

    // also if this object is the primary contents for a page, then set the current page to its parent
    if  (isset($this->objects[$id]['onPage'])) {

      $this->currentPage =  $this->objects[$id]['onPage'];
    }
  }


  /**
   * close an object
   */
  function  closeObject() {

    // close the object, as long as there was one open in the first place, which will be indicated by
    // an objectId on the stack.
    if  ($this->nStack>0) {

      $this->currentContents =  $this->stack[$this->nStack]['c'];

      $this->currentPage =  $this->stack[$this->nStack]['p'];

      $this->nStack--;

      // easier to probably not worry about removing the old entries, they will be overwritten
      // if there are new ones.

    }
  }


  /**
   * stop an object from appearing on pages from this point on
   */
  function  stopObject($id) {

    // if an object has been appearing on pages up to now, then stop it, this page will
    // be the last one that could contian it.
    if  (isset($this->addLooseObjects[$id])) {

      $this->addLooseObjects[$id] =  '';
    }
  }


  /**
   * after an object has been created, it wil only show if it has been added, using this function.
   */
  function  addObject($id, $options =  'add') {

    // add the specified object to the page
    if  (isset($this->looseObjects[$id]) &&  $this->currentContents !=  $id) {

      // then it is a valid object, and it is not being added to itself
      switch ($options) {

      case  'all':

        // then this object is to be added to this page (done in the next block) and
        // all future new pages.
        $this->addLooseObjects[$id] =  'all';

      case  'add':

        if  (isset($this->objects[$this->currentContents]['onPage'])) {

          // then the destination contents is the primary for the page
          // (though this object is actually added to that page)
          $this->o_page($this->objects[$this->currentContents]['onPage'], 'content', $id);
        }

        break;

      case  'even':

        $this->addLooseObjects[$id] =  'even';

        $pageObjectId =  $this->objects[$this->currentContents]['onPage'];

        if  ($this->objects[$pageObjectId]['info']['pageNum']%2 ==  0) {

          $this->addObject($id);
          // hacky huh :)

        }

        break;

      case  'odd':

        $this->addLooseObjects[$id] =  'odd';

        $pageObjectId =  $this->objects[$this->currentContents]['onPage'];

        if  ($this->objects[$pageObjectId]['info']['pageNum']%2 ==  1) {

          $this->addObject($id);
          // hacky huh :)

        }

        break;

      case  'next':

        $this->addLooseObjects[$id] =  'all';

        break;

      case  'nexteven':

        $this->addLooseObjects[$id] =  'even';

        break;

      case  'nextodd':

        $this->addLooseObjects[$id] =  'odd';

        break;
      }
    }
  }


  /**
   * return a storable representation of a specific object
   */
  function  serializeObject($id) {
    if  ( array_key_exists($id,  $this->objects))
      return  var_export($this->objects[$id],  true);


    return  null;
  }


  /**
   * restore an object from its stored representation.  returns its new object id.
   */
  function  restoreSerializedObject($obj) {


    $obj_id =  $this->openObject();

    eval('$this->objects[$obj_id] = ' . $obj . ';');

    $this->closeObject();

    return  $obj_id;
  }



  /**
   * add content to the documents info object
   */
  function  addInfo($label, $value =  0) {

    // this will only work if the label is one of the valid ones.
    // modify this so that arrays can be passed as well.
    // if $label is an array then assume that it is key => value pairs
    // else assume that they are both scalar, anything else will probably error
    if  (is_array($label)) {

      foreach ($label as  $l => $v) {

        $this->o_info($this->infoObject, $l, $v);
      }
    } else {

      $this->o_info($this->infoObject, $label, $value);
    }
  }


  /**
   * set the viewer preferences of the document, it is up to the browser to obey these.
   */
  function  setPreferences($label, $value =  0) {

    // this will only work if the label is one of the valid ones.
    if  (is_array($label)) {

      foreach ($label as  $l => $v) {

        $this->o_catalog($this->catalogId, 'viewerPreferences', array($l => $v));
      }
    } else {

      $this->o_catalog($this->catalogId, 'viewerPreferences', array($label => $value));
    }
  }


  /**
   * extract an integer from a position in a byte stream
   *
   * @access private
   */
  function  PRVT_getBytes(&$data, $pos, $num) {

    // return the integer represented by $num bytes from $pos within $data
    $ret =  0;

    for  ($i =  0;$i<$num;$i++) {

      $ret =  $ret*256;

      $ret+=  ord($data[$pos+$i]);
    }

    return  $ret;
  }


  /**
   * add a PNG image into the document, from a GD object
   * this should work with remote files
   */
  function addImagePng($file, $x, $y, $w =  0, $h =  0, &$img) {
    //if already cached, need not to read again
	if ( isset($this->imagelist[$file]) ) {
	  $data = null;
	} else {
  	  // Example for transparency handling on new image. Retain for current image
      // $tIndex = imagecolortransparent($img);
      // if ($tIndex > 0) {
      //   $tColor    = imagecolorsforindex($img, $tIndex);
      //   $new_tIndex    = imagecolorallocate($new_img, $tColor['red'], $tColor['green'], $tColor['blue']);
      //   imagefill($new_img, 0, 0, $new_tIndex);
      //   imagecolortransparent($new_img, $new_tIndex);
      // }
	  // blending mode (literal/blending) on drawing into current image. not relevant when not saved or not drawn
	  //imagealphablending($img, true);
	  //default, but explicitely set to ensure pdf compatibility
      imagesavealpha($img, false);
      
      $error =  0;
      //DEBUG_IMG_TEMP
      //debugpng
      if (DEBUGPNG) print '[addImagePng '.$file.']';

      ob_start();
      @imagepng($img);
      //$data = ob_get_contents(); ob_end_clean();
      $data = ob_get_clean();

      if ($data == '') {
        $error = 1;
        $errormsg = 'trouble writing file from GD';
        //DEBUG_IMG_TEMP
        //debugpng
        if (DEBUGPNG) print 'trouble writing file from GD';
	  }

      if  ($error) {
        $this->addMessage('PNG error - ('.$file.') '.$errormsg);
        return;
      }
    }  //End isset($this->imagelist[$file]) (png Duplicate removal)

    $this->addPngFromBuf($file, $x, $y, $w, $h, $data);
  }


  /**
   * add a PNG image into the document, from a file
   * this should work with remote files
   */
  function  addPngFromFile($file, $x, $y, $w =  0, $h =  0) {
    //if already cached, need not to read again
	if ( isset($this->imagelist[$file]) ) {
	  $img = null;
	} else {
      //png files typically contain an alpha channel.
      //pdf file format or class.pdf does not support alpha blending.
      //on alpha blended images, more transparent areas have a color near black.
      //This appears in the result on not storing the alpha channel.
      //Correct would be the box background image or its parent when transparent.
      //But this would make the image dependent on the background.
      //Therefore create an image with white background and copy in
      //A more natural background than black is white.
      //Therefore create an empty image with white background and merge the
      //image in with alpha blending.
      $imgtmp = @imagecreatefrompng($file);
      if (!$imgtmp) {
        return;
      }
      $sx = imagesx($imgtmp);
      $sy = imagesy($imgtmp);
      $img = imagecreatetruecolor($sx,$sy);
      imagealphablending($img, true);
  	  $ti = imagecolortransparent($imgtmp);
	  if ($ti >= 0) {
	    $tc = imagecolorsforindex($imgtmp,$ti);
        $ti = imagecolorallocate($img,$tc['red'],$tc['green'],$tc['blue']);
        imagefill($img,0,0,$ti);
        imagecolortransparent($img, $ti);
      } else {
        imagefill($img,1,1,imagecolorallocate($img,255,255,255));
      }
      imagecopy($img,$imgtmp,0,0,0,0,$sx,$sy);
      imagedestroy($imgtmp);
    }
    $this->addImagePng($file, $x, $y, $w, $h, $img);
  }


  /**
   * add a PNG image into the document, from a memory buffer of the file
   */
  function  addPngFromBuf($file, $x, $y, $w =  0, $h =  0, &$data) {

	if ( isset($this->imagelist[$file]) ) {
      //debugpng
      //if (DEBUGPNG) print '[addPngFromBuf Duplicate '.$file.']';
	  $data = null;
      $info['width'] = $this->imagelist[$file]['w'];
      $info['height'] = $this->imagelist[$file]['h'];
      $label = $this->imagelist[$file]['label'];

	} else {
      
      if ($data == null) {
      	$this->addMessage('addPngFromBuf error - ('.$imgname.') data not present!');
        return;
      }
      //debugpng
      //if (DEBUGPNG) print '[addPngFromBuf file='.$file.']';
    $error =  0;

    if  (!$error) {

      $header =  chr(137) .chr(80) .chr(78) .chr(71) .chr(13) .chr(10) .chr(26) .chr(10);

      if  (mb_substr($data, 0, 8, '8bit') !=  $header) {

        $error =  1;

        //debugpng
        if (DEBUGPNG) print '[addPngFromFile this file does not have a valid header '.$file.']';

        $errormsg =  'this file does not have a valid header';
      }
    }


    if  (!$error) {

      // set pointer
      $p =  8;

      $len =  mb_strlen($data, '8bit');

      // cycle through the file, identifying chunks
      $haveHeader =  0;

      $info =  array();

      $idata =  '';

      $pdata =  '';

      while  ($p < $len) {

        $chunkLen =  $this->PRVT_getBytes($data, $p, 4);

        $chunkType =  mb_substr($data, $p+4, 4, '8bit');

        //      echo $chunkType.' - '.$chunkLen.'<br>';

        switch ($chunkType) {

        case  'IHDR':

          // this is where all the file information comes from
          $info['width'] =  $this->PRVT_getBytes($data, $p+8, 4);

          $info['height'] =  $this->PRVT_getBytes($data, $p+12, 4);

          $info['bitDepth'] =  ord($data[$p+16]);

          $info['colorType'] =  ord($data[$p+17]);

          $info['compressionMethod'] =  ord($data[$p+18]);

          $info['filterMethod'] =  ord($data[$p+19]);

          $info['interlaceMethod'] =  ord($data[$p+20]);

          //print_r($info);
          $haveHeader =  1;

          if  ($info['compressionMethod'] !=  0) {

            $error =  1;

            //debugpng
            if (DEBUGPNG) print '[addPngFromFile unsupported compression method '.$file.']';

            $errormsg =  'unsupported compression method';
          }

          if  ($info['filterMethod'] !=  0) {

            $error =  1;

            //debugpng
            if (DEBUGPNG) print '[addPngFromFile unsupported filter method '.$file.']';

            $errormsg =  'unsupported filter method';
          }

          break;

        case  'PLTE':

          $pdata.=  mb_substr($data, $p+8, $chunkLen, '8bit');

          break;

        case  'IDAT':

          $idata.=  mb_substr($data, $p+8, $chunkLen, '8bit');

          break;

        case  'tRNS':

          //this chunk can only occur once and it must occur after the PLTE chunk and before IDAT chunk
          //print "tRNS found, color type = ".$info['colorType']."\n";
          $transparency =  array();

          if  ($info['colorType'] ==  3) {
            // indexed color, rbg
            /* corresponding to entries in the plte chunk
             Alpha for palette index 0: 1 byte
             Alpha for palette index 1: 1 byte
             ...etc...
            */
            // there will be one entry for each palette entry. up until the last non-opaque entry.
            // set up an array, stretching over all palette entries which will be o (opaque) or 1 (transparent)
            $transparency['type'] =  'indexed';

            $numPalette =  mb_strlen($pdata, '8bit') /3;

            $trans =  0;

            for  ($i =  $chunkLen;$i >=  0;$i--) {

              if  (ord($data[$p+8+$i]) ==  0) {

                $trans =  $i;
              }
            }

            $transparency['data'] =  $trans;
          } elseif ($info['colorType'] ==  0) {
            // grayscale
            /* corresponding to entries in the plte chunk
             Gray: 2 bytes, range 0 .. (2^bitdepth)-1
            */
            //            $transparency['grayscale'] = $this->PRVT_getBytes($data,$p+8,2); // g = grayscale
            $transparency['type'] =  'indexed';

            $transparency['data'] =  ord($data[$p+8+1]);
          } elseif ($info['colorType'] ==  2) {
            // truecolor
            /* corresponding to entries in the plte chunk
             Red: 2 bytes, range 0 .. (2^bitdepth)-1
             Green: 2 bytes, range 0 .. (2^bitdepth)-1
             Blue: 2 bytes, range 0 .. (2^bitdepth)-1
            */
            $transparency['r'] =  $this->PRVT_getBytes($data, $p+8, 2);
            // r from truecolor
            $transparency['g'] =  $this->PRVT_getBytes($data, $p+10, 2);
            // g from truecolor
            $transparency['b'] =  $this->PRVT_getBytes($data, $p+12, 2);
            // b from truecolor

            $transparency['type'] = 'color-key';
            
          } else {

            //unsupported transparency type

            //debugpng
            if (DEBUGPNG) print '[addPngFromFile unsupported transparency type '.$file.']';
          }

          // KS End new code
          break;

        default:

          break;
        }


        $p+=  $chunkLen+12;
      }


      if (!$haveHeader) {

        $error =  1;

        //debugpng
        if (DEBUGPNG) print '[addPngFromFile information header is missing '.$file.']';

        $errormsg =  'information header is missing';
      }

      if  (isset($info['interlaceMethod']) &&  $info['interlaceMethod']) {

        $error =  1;

        //debugpng
        if (DEBUGPNG) print '[addPngFromFile no support for interlaced images in pdf '.$file.']';

        $errormsg =  'There appears to be no support for interlaced images in pdf.';
      }
    }


    if  (!$error &&  $info['bitDepth'] > 8) {

      $error =  1;

      //debugpng
      if (DEBUGPNG) print '[addPngFromFile bit depth of 8 or less is supported '.$file.']';

      $errormsg =  'only bit depth of 8 or less is supported';
    }


    if  (!$error) {

      if  ($info['colorType'] !=  2 &&  $info['colorType'] !=  0 &&  $info['colorType'] !=  3) {

        $error =  1;

        //debugpng
        if (DEBUGPNG) print '[addPngFromFile alpha channel not supported: '.$info['colorType'].' '.$file.']';

        $errormsg =  'transparancey alpha channel not supported, transparency only supported for palette images.';
      } else {

        switch  ($info['colorType']) {

        case  3:

          $color =  'DeviceRGB';

          $ncolor =  1;

          break;

        case  2:

          $color =  'DeviceRGB';

          $ncolor =  3;

          break;

        case  0:

          $color =  'DeviceGray';

          $ncolor =  1;

          break;
        }
      }
    }

    if  ($error) {

      $this->addMessage('PNG error - ('.$file.') '.$errormsg);

      return;
    }

      //print_r($info);
      // so this image is ok... add it in.
      $this->numImages++;

      $im =  $this->numImages;

      $label =  'I'.$im;

      $this->numObj++;

      //  $this->o_image($this->numObj,'new',array('label' => $label,'data' => $idata,'iw' => $w,'ih' => $h,'type' => 'png','ic' => $info['width']));
      $options =  array('label' => $label, 'data' => $idata, 'bitsPerComponent' => $info['bitDepth'], 'pdata' => $pdata, 'iw' => $info['width'], 'ih' => $info['height'], 'type' => 'png', 'color' => $color, 'ncolor' => $ncolor);

      if  (isset($transparency)) {

        $options['transparency'] =  $transparency;
      }

      $this->o_image($this->numObj, 'new', $options);

      $this->imagelist[$file] = array('label' =>$label, 'w' => $info['width'], 'h' => $info['height']);
    }

    if  ($w <=  0 && $h <=  0) {
      $w =  $info['width'];
      $h =  $info['height'];
    }

    if  ($w <=  0) {

      $w =  $h/$info['height']*$info['width'];
    }

    if  ($h <=  0) {

      $h =  $w*$info['height']/$info['width'];
    }

    $this->objects[$this->currentContents]['c'].=  "\nq";

    $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $w) ." 0 0 ".sprintf('%.3F', $h) ." ".sprintf('%.3F', $x) ." ".sprintf('%.3F', $y) ." cm";

    $this->objects[$this->currentContents]['c'].=  "\n/".$label.' Do';

    $this->objects[$this->currentContents]['c'].=  "\nQ";
  }


  /**
   * add a JPEG image into the document, from a file
   */
  function  addJpegFromFile($img, $x, $y, $w =  0, $h =  0) {

    // attempt to add a jpeg image straight from a file, using no GD commands
    // note that this function is unable to operate on a remote file.

    if  (!file_exists($img)) {

      return;
    }

	if ( isset($this->imagelist[$img]) ) {
	  $data = null;
      $imageWidth = $this->imagelist[$img]['w'];
      $imageHeight = $this->imagelist[$img]['h'];
      $channels =  $this->imagelist[$img]['c'];
	} else {

      $tmp =  getimagesize($img);

      $imageWidth =  $tmp[0];

      $imageHeight =  $tmp[1];


      if  (isset($tmp['channels'])) {

        $channels =  $tmp['channels'];
      } else {

        $channels =  3;
      }


      //$fp = fopen($img,'rb');

      $data =  file_get_contents($img);

      //fread($fp,filesize($img));

      //fclose($fp);
    }

    if  ($w <=  0 &&  $h <=  0) {

      $w =  $imageWidth;
    }

    if  ($w ==  0) {

      $w =  $h/$imageHeight*$imageWidth;
    }

    if  ($h ==  0) {

      $h =  $w*$imageHeight/$imageWidth;
    }

    $this->addJpegImage_common($data, $x, $y, $w, $h, $imageWidth, $imageHeight, $channels, $img);
  }


  /**
   * add an image into the document, from a GD object
   * this function is not all that reliable, and I would probably encourage people to use
   * the file based functions
   */
  function  addImage(&$img, $x, $y, $w =  0, $h =  0, $quality =  75) {

    /* Todo:
     * Pass in original filename as $imgname
     * If already cached like image_iscached(), allow empty $img
     * How to get w  and h in this case?
     * Then caller can check with image_iscached() whether generation of image is needed.
     *
     * But anyway, this function is not used!
     */
    $imgname = tempnam($this->tmp, "cpdf_img_").'.jpeg';

    // add a new image into the current location, as an external object
    // add the image at $x,$y, and with width and height as defined by $w & $h

    // note that this will only work with full colour images and makes them jpg images for display
    // later versions could present lossless image formats if there is interest.

    // there seems to be some problem here in that images that have quality set above 75 do not appear
    // not too sure why this is, but in the meantime I have restricted this to 75.
    if  ($quality>75) {

      $quality =  75;
    }


    // if the width or height are set to zero, then set the other one based on keeping the image
    // height/width ratio the same, if they are both zero, then give up :)
    $imageWidth =  imagesx($img);

    $imageHeight =  imagesy($img);


    if  ($w <=  0 &&  $h <=  0) {

      return;
    }

    if  ($w ==  0) {

      $w =  $h/$imageHeight*$imageWidth;
    }

    if  ($h ==  0) {

      $h =  $w*$imageHeight/$imageWidth;
    }

    // gotta get the data out of the img..
    ob_start();
    imagejpeg($img, '', $quality);
    //$data = ob_get_contents(); ob_end_clean();
    $data = ob_get_clean();

    $this->addJpegImage_common($data, $x, $y, $w, $h, $imageWidth, $imageHeight, $imgname);
  }


  /* Check if image already added to pdf image directory.
   * If yes, need not to create again (pass empty data)
   */
  function  image_iscached($imgname) {
    return isset($this->imagelist[$imgname]);
  }


  /**
   * common code used by the two JPEG adding functions
   *
   * @access private
   */
  function  addJpegImage_common(&$data, $x, $y, $w =  0, $h =  0, $imageWidth, $imageHeight, $channels =  3, $imgname) {

    if ( isset($this->imagelist[$imgname]) ) {
      $label = $this->imagelist[$imgname]['label'];
      //debugpng
      //if (DEBUGPNG) print '[addJpegImage_common Duplicate '.$imgname.']';

    } else {

      if ($data == null) {
      	$this->addMessage('addJpegImage_common error - ('.$imgname.') data not present!');
        return;
      }

      // note that this function is not to be called externally
      // it is just the common code between the GD and the file options
      $this->numImages++;

      $im =  $this->numImages;

      $label =  'I'.$im;

      $this->numObj++;

      $this->o_image($this->numObj, 'new', array('label' => $label, 'data' => &$data, 'iw' => $imageWidth, 'ih' => $imageHeight, 'channels' => $channels));

      $this->imagelist[$imgname] = array('label' =>$label, 'w' => $imageWidth, 'h' => $imageHeight, 'c'=> $channels );
    }


    $this->objects[$this->currentContents]['c'].=  "\nq";

    $this->objects[$this->currentContents]['c'].=  "\n".sprintf('%.3F', $w) ." 0 0 ".sprintf('%.3F', $h) ." ".sprintf('%.3F', $x) ." ".sprintf('%.3F', $y) ." cm";

    $this->objects[$this->currentContents]['c'].=  "\n/".$label.' Do';

    $this->objects[$this->currentContents]['c'].=  "\nQ";
  }


  /**
   * specify where the document should open when it first starts
   */
  function  openHere($style, $a =  0, $b =  0, $c =  0) {

    // this function will open the document at a specified page, in a specified style
    // the values for style, and the required paramters are:
    // 'XYZ'  left, top, zoom
    // 'Fit'
    // 'FitH' top
    // 'FitV' left
    // 'FitR' left,bottom,right
    // 'FitB'
    // 'FitBH' top
    // 'FitBV' left
    $this->numObj++;

    $this->o_destination($this->numObj, 'new', array('page' => $this->currentPage, 'type' => $style, 'p1' => $a, 'p2' => $b, 'p3' => $c));

    $id =  $this->catalogId;

    $this->o_catalog($id, 'openHere', $this->numObj);
  }


  /**
   * create a labelled destination within the document
   */
  function  addDestination($label, $style, $a =  0, $b =  0, $c =  0) {

    // associates the given label with the destination, it is done this way so that a destination can be specified after
    // it has been linked to
    // styles are the same as the 'openHere' function
    $this->numObj++;

    $this->o_destination($this->numObj, 'new', array('page' => $this->currentPage, 'type' => $style, 'p1' => $a, 'p2' => $b, 'p3' => $c));

    $id =  $this->numObj;

    // store the label->idf relationship, note that this means that labels can be used only once
    $this->destinations["$label"] =  $id;
  }


  /**
   * define font families, this is used to initialize the font families for the default fonts
   * and for the user to add new ones for their fonts. The default bahavious can be overridden should
   * that be desired.
   */
  function  setFontFamily($family, $options =  '') {

    if  (!is_array($options)) {

      if  ($family ==  'init') {

        // set the known family groups
        // these font families will be used to enable bold and italic markers to be included
        // within text streams. html forms will be used... <b></b> <i></i>
        $this->fontFamilies['Helvetica.afm'] =
          array('b' => 'Helvetica-Bold.afm',
                'i' => 'Helvetica-Oblique.afm',
                'bi' => 'Helvetica-BoldOblique.afm',
                'ib' => 'Helvetica-BoldOblique.afm');

        $this->fontFamilies['Courier.afm'] =
          array('b' => 'Courier-Bold.afm',
                'i' => 'Courier-Oblique.afm',
                'bi' => 'Courier-BoldOblique.afm',
                'ib' => 'Courier-BoldOblique.afm');

        $this->fontFamilies['Times-Roman.afm'] =
          array('b' => 'Times-Bold.afm',
                'i' => 'Times-Italic.afm',
                'bi' => 'Times-BoldItalic.afm',
                'ib' => 'Times-BoldItalic.afm');
      }
    } else {

      // the user is trying to set a font family
      // note that this can also be used to set the base ones to something else
      if  (mb_strlen($family)) {

        $this->fontFamilies[$family] =  $options;
      }
    }
  }


  /**
   * used to add messages for use in debugging
   */
  function  addMessage($message) {

    $this->messages.=  $message."\n";
  }


  /**
   * a few functions which should allow the document to be treated transactionally.
   */
  function  transaction($action) {

    switch  ($action) {

    case  'start':

      // store all the data away into the checkpoint variable
      $data =  get_object_vars($this);

      $this->checkpoint =  $data;

      unset($data);

      break;

    case  'commit':

      if  (is_array($this->checkpoint) &&  isset($this->checkpoint['checkpoint'])) {

        $tmp =  $this->checkpoint['checkpoint'];

        $this->checkpoint =  $tmp;

        unset($tmp);
      } else {

        $this->checkpoint =  '';
      }

      break;

    case  'rewind':

      // do not destroy the current checkpoint, but move us back to the state then, so that we can try again
      if  (is_array($this->checkpoint)) {

        // can only abort if were inside a checkpoint
        $tmp =  $this->checkpoint;

        foreach ($tmp as  $k => $v) {

          if  ($k !=  'checkpoint') {

            $this->$k =  $v;
          }
        }

        unset($tmp);
      }

      break;

    case  'abort':

      if  (is_array($this->checkpoint)) {

        // can only abort if were inside a checkpoint
        $tmp =  $this->checkpoint;

        foreach ($tmp as  $k => $v) {

          $this->$k =  $v;
        }

        unset($tmp);
      }

      break;
    }
  }
}
// end of class

?>