Memory optimization

Add-On Memory optimization

Informations

Author:Olivier
License: FPDF

Description

The standard FPDF class builds the document entirely in memory, which can be problematic for large documents. This extension saves the pages to the destination file as soon as they are finished, which solves the issue.

After you have created the object, call Open() with the name of the file:

$pdf = new FPDF2File();
$pdf->Open('doc.pdf');

and when the document is finished, call Output():

$pdf->Output();

Note: you can't use the AliasNbPages() method with this extension.

Source

<?php
require('fpdf.php');

class FPDF2File extends FPDF
{
protected $f;

public function Open($file='doc.pdf')
{
    $this->f = fopen($file, 'wb');
    if(!$this->f)
        $this->Error('Unable to create output file: '.$file);
    $this->_putheader();
}

public function Image($file, $x=null, $y=null, $w=0, $h=0, $type='', $link='')
{
    if(!isset($this->images[$file]))
    {
        // Retrieve only metadata
        $a = getimagesize($file);
        if($a===false)
            $this->Error('Missing or incorrect image file: '.$file);
        $this->images[$file] = array('w'=>$a[0], 'h'=>$a[1], 'type'=>$a[2], 'i'=>count($this->images)+1);
    }
    parent::Image($file, $x, $y, $w, $h, $type, $link);
}

public function Output($dest='', $name='', $isUTF8=false)
{
    if($this->state<3)
        $this->Close();
}

protected function _endpage()
{
    parent::_endpage();
    // Write page to file
    $this->_putstreamobject($this->pages[$this->page]);
    unset($this->pages[$this->page]);
}

protected function _getoffset()
{
    return ftell($this->f);
}

protected function _put($s)
{
    fwrite($this->f, $s."\n", strlen($s)+1);
}

protected function _putimages()
{
    foreach(array_keys($this->images) as $file)
    {
        $type = $this->images[$file]['type'];
        if($type==1)
            $info=$this->_parsegif($file);
        elseif($type==2)
            $info=$this->_parsejpg($file);
        elseif($type==3)
            $info=$this->_parsepng($file);
        else
            $this->Error('Unsupported image type: '.$file);
        $this->_putimage($info);
        $this->images[$file]['n'] = $info['n'];
        unset($info);
    }
}

protected function _putpage($n)
{
    $this->_newobj();
    $this->_put('<</Type /Page');
    $this->_put('/Parent 1 0 R');
    if(isset($this->PageInfo[$n]['size']))
        $this->_put(sprintf('/MediaBox [0 0 %.2F %.2F]', $this->PageInfo[$n]['size'][0], $this->PageInfo[$n]['size'][1]));
    if(isset($this->PageInfo[$n]['rotation']))
        $this->_put('/Rotate '.$this->PageInfo[$n]['rotation']);
    $this->_put('/Resources 2 0 R');
    if(!empty($this->PageLinks[$n]))
    {
        $s = '/Annots [';
        foreach($this->PageLinks[$n] as $pl)
            $s .= $pl[5].' 0 R ';
        $s .= ']';
        $this->_put($s);
    }
    if($this->WithAlpha)
        $this->_put('/Group <</Type /Group /S /Transparency /CS /DeviceRGB>>');
    $this->_put('/Contents '.(2+$n).' 0 R>>');
    $this->_put('endobj');
    // Link annotations
    $this->_putlinks($n);
}

protected function _putpages()
{
    $nb = $this->page;
    $n = $this->n;
    for($i=1;$i<=$nb;$i++)
    {
        $this->PageInfo[$i]['n'] = ++$n;
        foreach($this->PageLinks[$i] as &$pl)
            $pl[5] = ++$n;
        unset($pl);
    }
    for($i=1;$i<=$nb;$i++)
        $this->_putpage($i);
    // Pages root
    $this->_newobj(1);
    $this->_put('<</Type /Pages');
    $kids = '/Kids [';
    for($i=1;$i<=$nb;$i++)
        $kids .= $this->PageInfo[$i]['n'].' 0 R ';
    $kids .= ']';
    $this->_put($kids);
    $this->_put('/Count '.$nb);
    if($this->DefOrientation=='P')
    {
        $w = $this->DefPageSize[0];
        $h = $this->DefPageSize[1];
    }
    else
    {
        $w = $this->DefPageSize[1];
        $h = $this->DefPageSize[0];
    }
    $this->_put(sprintf('/MediaBox [0 0 %.2F %.2F]', $w*$this->k, $h*$this->k));
    $this->_put('>>');
    $this->_put('endobj');
}

protected function _putheader()
{
    if($this->_getoffset()==0)
        parent::_putheader();
}

protected function _enddoc()
{
    parent::_enddoc();
    fclose($this->f);
}
}
?>

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