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Editing: fpdf.php

<?php
/*******************************************************************************
* FPDF                                                                         *
*                                                                              *
* Version: 1.84                                                                *
* Date:    2021-08-28                                                          *
* Author:  Olivier PLATHEY                                                     *
*******************************************************************************/

define('FPDF_VERSION','1.84');

class FPDF
{
protected $page;               // current page number
protected $n;                  // current object number
protected $offsets;            // array of object offsets
protected $buffer;             // buffer holding in-memory PDF
protected $pages;              // array containing pages
protected $state;              // current document state
protected $compress;           // compression flag
protected $k;                  // scale factor (number of points in user unit)
protected $DefOrientation;     // default orientation
protected $CurOrientation;     // current orientation
protected $StdPageSizes;       // standard page sizes
protected $DefPageSize;        // default page size
protected $CurPageSize;        // current page size
protected $CurRotation;        // current page rotation
protected $PageInfo;           // page-related data
protected $wPt, $hPt;          // dimensions of current page in points
protected $w, $h;              // dimensions of current page in user unit
protected $lMargin;            // left margin
protected $tMargin;            // top margin
protected $rMargin;            // right margin
protected $bMargin;            // page break margin
protected $cMargin;            // cell margin
protected $x, $y;              // current position in user unit
protected $lasth;              // height of last printed cell
protected $LineWidth;          // line width in user unit
protected $fontpath;           // path containing fonts
protected $CoreFonts;          // array of core font names
protected $fonts;              // array of used fonts
protected $FontFiles;          // array of font files
protected $encodings;          // array of encodings
protected $cmaps;              // array of ToUnicode CMaps
protected $FontFamily;         // current font family
protected $FontStyle;          // current font style
protected $underline;          // underlining flag
protected $CurrentFont;        // current font info
protected $FontSizePt;         // current font size in points
protected $FontSize;           // current font size in user unit
protected $DrawColor;          // commands for drawing color
protected $FillColor;          // commands for filling color
protected $TextColor;          // commands for text color
protected $ColorFlag;          // indicates whether fill and text colors are different
protected $WithAlpha;          // indicates whether alpha channel is used
protected $ws;                 // word spacing
protected $images;             // array of used images
protected $PageLinks;          // array of links in pages
protected $links;              // array of internal links
protected $AutoPageBreak;      // automatic page breaking
protected $PageBreakTrigger;   // threshold used to trigger page breaks
protected $InHeader;           // flag set when processing header
protected $InFooter;           // flag set when processing footer
protected $AliasNbPages;       // alias for total number of pages
protected $ZoomMode;           // zoom display mode
protected $LayoutMode;         // layout display mode
protected $metadata;           // document properties
protected $PDFVersion;         // PDF version number

/*******************************************************************************
*                               Public methods                                 *
*******************************************************************************/

function SetMargins($left, $top, $right=null)
{
	// Set left, top and right margins
	$this->lMargin = $left;
	$this->tMargin = $top;
	if($right===null)
		$right = $left;
	$this->rMargin = $right;
}

function SetLeftMargin($margin)
{
	// Set left margin
	$this->lMargin = $margin;
	if($this->page>0 && $this->x<$margin)
		$this->x = $margin;
}

function SetTopMargin($margin)
{
	// Set top margin
	$this->tMargin = $margin;
}

function SetRightMargin($margin)
{
	// Set right margin
	$this->rMargin = $margin;
}

function SetAutoPageBreak($auto, $margin=0)
{
	// Set auto page break mode and triggering margin
	$this->AutoPageBreak = $auto;
	$this->bMargin = $margin;
	$this->PageBreakTrigger = $this->h-$margin;
}

function SetDisplayMode($zoom, $layout='default')
{
	// Set display mode in viewer
	if($zoom=='fullpage' || $zoom=='fullwidth' || $zoom=='real' || $zoom=='default' || !is_string($zoom))
		$this->ZoomMode = $zoom;
	else
		$this->Error('Incorrect zoom display mode: '.$zoom);
	if($layout=='single' || $layout=='continuous' || $layout=='two' || $layout=='default')
		$this->LayoutMode = $layout;
	else
		$this->Error('Incorrect layout display mode: '.$layout);
}

function SetCompression($compress)
{
	// Set page compression
	if(function_exists('gzcompress'))
		$this->compress = $compress;
	else
		$this->compress = false;
}

function SetTitle($title, $isUTF8=false)
{
	// Title of document
	$this->metadata['Title'] = $isUTF8 ? $title : utf8_encode($title);
}

function SetAuthor($author, $isUTF8=false)
{
	// Author of document
	$this->metadata['Author'] = $isUTF8 ? $author : utf8_encode($author);
}

function SetSubject($subject, $isUTF8=false)
{
	// Subject of document
	$this->metadata['Subject'] = $isUTF8 ? $subject : utf8_encode($subject);
}

function SetKeywords($keywords, $isUTF8=false)
{
	// Keywords of document
	$this->metadata['Keywords'] = $isUTF8 ? $keywords : utf8_encode($keywords);
}

function SetCreator($creator, $isUTF8=false)
{
	// Creator of document
	$this->metadata['Creator'] = $isUTF8 ? $creator : utf8_encode($creator);
}

function AliasNbPages($alias='{nb}')
{
	// Define an alias for total number of pages
	$this->AliasNbPages = $alias;
}

function Error($msg)
{
	// Fatal error
	throw new Exception('FPDF error: '.$msg);
}

function Close()
{
	// Terminate document
	if($this->state==3)
		return;
	if($this->page==0)
		$this->AddPage();
	// Page footer
	$this->InFooter = true;
	$this->Footer();
	$this->InFooter = false;
	// Close page
	$this->_endpage();
	// Close document
	$this->_enddoc();
}

function Header()
{
	// To be implemented in your own inherited class
}

function Footer()
{
	// To be implemented in your own inherited class
}

function PageNo()
{
	// Get current page number
	return $this->page;
}

function SetDrawColor($r, $g=null, $b=null)
{
	// Set color for all stroking operations
	if(($r==0 && $g==0 && $b==0) || $g===null)
		$this->DrawColor = sprintf('%.3F G',$r/255);
	else
		$this->DrawColor = sprintf('%.3F %.3F %.3F RG',$r/255,$g/255,$b/255);
	if($this->page>0)
		$this->_out($this->DrawColor);
}

function SetFillColor($r, $g=null, $b=null)
{
	// Set color for all filling operations
	if(($r==0 && $g==0 && $b==0) || $g===null)
		$this->FillColor = sprintf('%.3F g',$r/255);
	else
		$this->FillColor = sprintf('%.3F %.3F %.3F rg',$r/255,$g/255,$b/255);
	$this->ColorFlag = ($this->FillColor!=$this->TextColor);
	if($this->page>0)
		$this->_out($this->FillColor);
}

function SetTextColor($r, $g=null, $b=null)
{
	// Set color for text
	if(($r==0 && $g==0 && $b==0) || $g===null)
		$this->TextColor = sprintf('%.3F g',$r/255);
	else
		$this->TextColor = sprintf('%.3F %.3F %.3F rg',$r/255,$g/255,$b/255);
	$this->ColorFlag = ($this->FillColor!=$this->TextColor);
}

function GetStringWidth($s)
{
	// Get width of a string in the current font
	$s = (string)$s;
	$cw = &$this->CurrentFont['cw'];
	$w = 0;
	$l = strlen($s);
	for($i=0;$i<$l;$i++)
		$w += $cw[$s[$i]];
	return $w*$this->FontSize/1000;
}

function SetLineWidth($width)
{
	// Set line width
	$this->LineWidth = $width;
	if($this->page>0)
		$this->_out(sprintf('%.2F w',$width*$this->k));
}

function Line($x1, $y1, $x2, $y2)
{
	// Draw a line
	$this->_out(sprintf('%.2F %.2F m %.2F %.2F l S',$x1*$this->k,($this->h-$y1)*$this->k,$x2*$this->k,($this->h-$y2)*$this->k));
}

function Rect($x, $y, $w, $h, $style='')
{
	// Draw a rectangle
	if($style=='F')
		$op = 'f';
	elseif($style=='FD' || $style=='DF')
		$op = 'B';
	else
		$op = 'S';
	$this->_out(sprintf('%.2F %.2F %.2F %.2F re %s',$x*$this->k,($this->h-$y)*$this->k,$w*$this->k,-$h*$this->k,$op));
}

function AddFont($family, $style='', $file='')
{
	// Add a TrueType, OpenType or Type1 font
	$family = strtolower($family);
	if($file=='')
		$file = str_replace(' ','',$family).strtolower($style).'.php';
	$style = strtoupper($style);
	if($style=='IB')
		$style = 'BI';
	$fontkey = $family.$style;
	if(isset($this->fonts[$fontkey]))
		return;
	$info = $this->_loadfont($file);
	$info['i'] = count($this->fonts)+1;
	if(!empty($info['file']))
	{
		// Embedded font
		if($info['type']=='TrueType')
			$this->FontFiles[$info['file']] = array('length1'=>$info['originalsize']);
		else
			$this->FontFiles[$info['file']] = array('length1'=>$info['size1'], 'length2'=>$info['size2']);
	}
	$this->fonts[$fontkey] = $info;
}

function SetFontSize($size)
{
	// Set font size in points
	if($this->FontSizePt==$size)
		return;
	$this->FontSizePt = $size;
	$this->FontSize = $size/$this->k;
	if($this->page>0)
		$this->_out(sprintf('BT /F%d %.2F Tf ET',$this->CurrentFont['i'],$this->FontSizePt));
}

function AddLink()
{
	// Create a new internal link
	$n = count($this->links)+1;
	$this->links[$n] = array(0, 0);
	return $n;
}

function SetLink($link, $y=0, $page=-1)
{
	// Set destination of internal link
	if($y==-1)
		$y = $this->y;
	if($page==-1)
		$page = $this->page;
	$this->links[$link] = array($page, $y);
}

function Link($x, $y, $w, $h, $link)
{
	// Put a link on the page
	$this->PageLinks[$this->page][] = array($x*$this->k, $this->hPt-$y*$this->k, $w*$this->k, $h*$this->k, $link);
}

function Text($x, $y, $txt)
{
	// Output a string
	if(!isset($this->CurrentFont))
		$this->Error('No font has been set');
	$s = sprintf('BT %.2F %.2F Td (%s) Tj ET',$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
	if($this->underline && $txt!='')
		$s .= ' '.$this->_dounderline($x,$y,$txt);
	if($this->ColorFlag)
		$s = 'q '.$this->TextColor.' '.$s.' Q';
	$this->_out($s);
}

function AcceptPageBreak()
{
	// Accept automatic page break or not
	return $this->AutoPageBreak;
}

function Ln($h=null)
{
	// Line feed; default value is the last cell height
	$this->x = $this->lMargin;
	if($h===null)
		$this->y += $this->lasth;
	else
		$this->y += $h;
}

function Image($file, $x=null, $y=null, $w=0, $h=0, $type='', $link='')
{
	// Put an image on the page
	if($file=='')
		$this->Error('Image file name is empty');
	if(!isset($this->images[$file]))
	{
		// First use of this image, get info
		if($type=='')
		{
			$pos = strrpos($file,'.');
			if(!$pos)
				$this->Error('Image file has no extension and no type was specified: '.$file);
			$type = substr($file,$pos+1);
		}
		$type = strtolower($type);
		if($type=='jpeg')
			$type = 'jpg';
		$mtd = '_parse'.$type;
		if(!method_exists($this,$mtd))
			$this->Error('Unsupported image type: '.$type);
		$info = $this->$mtd($file);
		$info['i'] = count($this->images)+1;
		$this->images[$file] = $info;
	}
	else
		$info = $this->images[$file];

// Automatic width and height calculation if needed
	if($w==0 && $h==0)
	{
		// Put image at 96 dpi
		$w = -96;
		$h = -96;
	}
	if($w<0)
		$w = -$info['w']*72/$w/$this->k;
	if($h<0)
		$h = -$info['h']*72/$h/$this->k;
	if($w==0)
		$w = $h*$info['w']/$info['h'];
	if($h==0)
		$h = $w*$info['h']/$info['w'];

// Flowing mode
	if($y===null)
	{
		if($this->y+$h>$this->PageBreakTrigger && !$this->InHeader && !$this->InFooter && $this->AcceptPageBreak())
		{
			// Automatic page break
			$x2 = $this->x;
			$this->AddPage($this->CurOrientation,$this->CurPageSize,$this->CurRotation);
			$this->x = $x2;
		}
		$y = $this->y;
		$this->y += $h;
	}

if($x===null)
		$x = $this->x;
	$this->_out(sprintf('q %.2F 0 0 %.2F %.2F %.2F cm /I%d Do Q',$w*$this->k,$h*$this->k,$x*$this->k,($this->h-($y+$h))*$this->k,$info['i']));
	if($link)
		$this->Link($x,$y,$w,$h,$link);
}

function GetPageWidth()
{
	// Get current page width
	return $this->w;
}

function GetPageHeight()
{
	// Get current page height
	return $this->h;
}

function GetX()
{
	// Get x position
	return $this->x;
}

function SetX($x)
{
	// Set x position
	if($x>=0)
		$this->x = $x;
	else
		$this->x = $this->w+$x;
}

function GetY()
{
	// Get y position
	return $this->y;
}

function SetY($y, $resetX=true)
{
	// Set y position and optionally reset x
	if($y>=0)
		$this->y = $y;
	else
		$this->y = $this->h+$y;
	if($resetX)
		$this->x = $this->lMargin;
}

function SetXY($x, $y)
{
	// Set x and y positions
	$this->SetX($x);
	$this->SetY($y,false);
}

/*******************************************************************************
*                              Protected methods                               *
*******************************************************************************/

protected function _dochecks()
{
	// Check mbstring overloading
	if(ini_get('mbstring.func_overload') & 2)
		$this->Error('mbstring overloading must be disabled');
}

protected function _checkoutput()
{
	if(PHP_SAPI!='cli')
	{
		if(headers_sent($file,$line))
			$this->Error("Some data has already been output, can't send PDF file (output started at $file:$line)");
	}
	if(ob_get_length())
	{
		// The output buffer is not empty
		if(preg_match('/^(\xEF\xBB\xBF)?\s*$/',ob_get_contents()))
		{
			// It contains only a UTF-8 BOM and/or whitespace, let's clean it
			ob_clean();
		}
		else
			$this->Error("Some data has already been output, can't send PDF file");
	}
}

protected function _getpagesize($size)
{
	if(is_string($size))
	{
		$size = strtolower($size);
		if(!isset($this->StdPageSizes[$size]))
			$this->Error('Unknown page size: '.$size);
		$a = $this->StdPageSizes[$size];
		return array($a[0]/$this->k, $a[1]/$this->k);
	}
	else
	{
		if($size[0]>$size[1])
			return array($size[1], $size[0]);
		else
			return $size;
	}
}

protected function _beginpage($orientation, $size, $rotation)
{
	$this->page++;
	$this->pages[$this->page] = '';
	$this->PageLinks[$this->page] = array();
	$this->state = 2;
	$this->x = $this->lMargin;
	$this->y = $this->tMargin;
	$this->FontFamily = '';
	// Check page size and orientation
	if($orientation=='')
		$orientation = $this->DefOrientation;
	else
		$orientation = strtoupper($orientation[0]);
	if($size=='')
		$size = $this->DefPageSize;
	else
		$size = $this->_getpagesize($size);
	if($orientation!=$this->CurOrientation || $size[0]!=$this->CurPageSize[0] || $size[1]!=$this->CurPageSize[1])
	{
		// New size or orientation
		if($orientation=='P')
		{
			$this->w = $size[0];
			$this->h = $size[1];
		}
		else
		{
			$this->w = $size[1];
			$this->h = $size[0];
		}
		$this->wPt = $this->w*$this->k;
		$this->hPt = $this->h*$this->k;
		$this->PageBreakTrigger = $this->h-$this->bMargin;
		$this->CurOrientation = $orientation;
		$this->CurPageSize = $size;
	}
	if($orientation!=$this->DefOrientation || $size[0]!=$this->DefPageSize[0] || $size[1]!=$this->DefPageSize[1])
		$this->PageInfo[$this->page]['size'] = array($this->wPt, $this->hPt);
	if($rotation!=0)
	{
		if($rotation%90!=0)
			$this->Error('Incorrect rotation value: '.$rotation);
		$this->CurRotation = $rotation;
		$this->PageInfo[$this->page]['rotation'] = $rotation;
	}
}

protected function _endpage()
{
	$this->state = 1;
}

protected function _loadfont($font)
{
	// Load a font definition file from the font directory
	if(strpos($font,'/')!==false || strpos($font,"\\")!==false)
		$this->Error('Incorrect font definition file name: '.$font);
	include($this->fontpath.$font);
	if(!isset($name))
		$this->Error('Could not include font definition file');
	if(isset($enc))
		$enc = strtolower($enc);
	if(!isset($subsetted))
		$subsetted = false;
	return get_defined_vars();
}

protected function _isascii($s)
{
	// Test if string is ASCII
	$nb = strlen($s);
	for($i=0;$i<$nb;$i++)
	{
		if(ord($s[$i])>127)
			return false;
	}
	return true;
}

protected function _httpencode($param, $value, $isUTF8)
{
	// Encode HTTP header field parameter
	if($this->_isascii($value))
		return $param.'="'.$value.'"';
	if(!$isUTF8)
		$value = utf8_encode($value);
	if(strpos($_SERVER['HTTP_USER_AGENT'],'MSIE')!==false)
		return $param.'="'.rawurlencode($value).'"';
	else
		return $param."*=UTF-8''".rawurlencode($value);
}

protected function _UTF8toUTF16($s)
{
	// Convert UTF-8 to UTF-16BE with BOM
	$res = "\xFE\xFF";
	$nb = strlen($s);
	$i = 0;
	while($i<$nb)
	{
		$c1 = ord($s[$i++]);
		if($c1>=224)
		{
			// 3-byte character
			$c2 = ord($s[$i++]);
			$c3 = ord($s[$i++]);
			$res .= chr((($c1 & 0x0F)<<4) + (($c2 & 0x3C)>>2));
			$res .= chr((($c2 & 0x03)<<6) + ($c3 & 0x3F));
		}
		elseif($c1>=192)
		{
			// 2-byte character
			$c2 = ord($s[$i++]);
			$res .= chr(($c1 & 0x1C)>>2);
			$res .= chr((($c1 & 0x03)<<6) + ($c2 & 0x3F));
		}
		else
		{
			// Single-byte character
			$res .= "\0".chr($c1);
		}
	}
	return $res;
}

protected function _escape($s)
{
	// Escape special characters
	if(strpos($s,'(')!==false || strpos($s,')')!==false || strpos($s,'\\')!==false || strpos($s,"\r")!==false)
		return str_replace(array('\\','(',')',"\r"), array('\\\\','\$','\$','\\r'), $s);
	else
		return $s;
}

protected function _textstring($s)
{
	// Format a text string
	if(!$this->_isascii($s))
		$s = $this->_UTF8toUTF16($s);
	return '('.$this->_escape($s).')';
}

protected function _dounderline($x, $y, $txt)
{
	// Underline text
	$up = $this->CurrentFont['up'];
	$ut = $this->CurrentFont['ut'];
	$w = $this->GetStringWidth($txt)+$this->ws*substr_count($txt,' ');
	return sprintf('%.2F %.2F %.2F %.2F re f',$x*$this->k,($this->h-($y-$up/1000*$this->FontSize))*$this->k,$w*$this->k,-$ut/1000*$this->FontSizePt);
}

protected function _parsejpg($file)
{
	// Extract info from a JPEG file
	$a = getimagesize($file);
	if(!$a)
		$this->Error('Missing or incorrect image file: '.$file);
	if($a[2]!=2)
		$this->Error('Not a JPEG file: '.$file);
	if(!isset($a['channels']) || $a['channels']==3)
		$colspace = 'DeviceRGB';
	elseif($a['channels']==4)
		$colspace = 'DeviceCMYK';
	else
		$colspace = 'DeviceGray';
	$bpc = isset($a['bits']) ? $a['bits'] : 8;
	$data = file_get_contents($file);
	return array('w'=>$a[0], 'h'=>$a[1], 'cs'=>$colspace, 'bpc'=>$bpc, 'f'=>'DCTDecode', 'data'=>$data);
}

protected function _parsepng($file)
{
	// Extract info from a PNG file
	$f = fopen($file,'rb');
	if(!$f)
		$this->Error('Can\'t open image file: '.$file);
	$info = $this->_parsepngstream($f,$file);
	fclose($f);
	return $info;
}

protected function _parsepngstream($f, $file)
{
	// Check signature
	if($this->_readstream($f,8)!=chr(137).'PNG'.chr(13).chr(10).chr(26).chr(10))
		$this->Error('Not a PNG file: '.$file);

// Read header chunk
	$this->_readstream($f,4);
	if($this->_readstream($f,4)!='IHDR')
		$this->Error('Incorrect PNG file: '.$file);
	$w = $this->_readint($f);
	$h = $this->_readint($f);
	$bpc = ord($this->_readstream($f,1));
	if($bpc>8)
		$this->Error('16-bit depth not supported: '.$file);
	$ct = ord($this->_readstream($f,1));
	if($ct==0 || $ct==4)
		$colspace = 'DeviceGray';
	elseif($ct==2 || $ct==6)
		$colspace = 'DeviceRGB';
	elseif($ct==3)
		$colspace = 'Indexed';
	else
		$this->Error('Unknown color type: '.$file);
	if(ord($this->_readstream($f,1))!=0)
		$this->Error('Unknown compression method: '.$file);
	if(ord($this->_readstream($f,1))!=0)
		$this->Error('Unknown filter method: '.$file);
	if(ord($this->_readstream($f,1))!=0)
		$this->Error('Interlacing not supported: '.$file);
	$this->_readstream($f,4);
	$dp = '/Predictor 15 /Colors '.($colspace=='DeviceRGB' ? 3 : 1).' /BitsPerComponent '.$bpc.' /Columns '.$w;

// Scan chunks looking for palette, transparency and image data
	$pal = '';
	$trns = '';
	$data = '';
	do
	{
		$n = $this->_readint($f);
		$type = $this->_readstream($f,4);
		if($type=='PLTE')
		{
			// Read palette
			$pal = $this->_readstream($f,$n);
			$this->_readstream($f,4);
		}
		elseif($type=='tRNS')
		{
			// Read transparency info
			$t = $this->_readstream($f,$n);
			if($ct==0)
				$trns = array(ord(substr($t,1,1)));
			elseif($ct==2)
				$trns = array(ord(substr($t,1,1)), ord(substr($t,3,1)), ord(substr($t,5,1)));
			else
			{
				$pos = strpos($t,chr(0));
				if($pos!==false)
					$trns = array($pos);
			}
			$this->_readstream($f,4);
		}
		elseif($type=='IDAT')
		{
			// Read image data block
			$data .= $this->_readstream($f,$n);
			$this->_readstream($f,4);
		}
		elseif($type=='IEND')
			break;
		else
			$this->_readstream($f,$n+4);
	}
	while($n);

if($colspace=='Indexed' && empty($pal))
		$this->Error('Missing palette in '.$file);
	$info = array('w'=>$w, 'h'=>$h, 'cs'=>$colspace, 'bpc'=>$bpc, 'f'=>'FlateDecode', 'dp'=>$dp, 'pal'=>$pal, 'trns'=>$trns);
	if($ct>=4)
	{
		// Extract alpha channel
		if(!function_exists('gzuncompress'))
			$this->Error('Zlib not available, can\'t handle alpha channel: '.$file);
		$data = gzuncompress($data);
		$color = '';
		$alpha = '';
		if($ct==4)
		{
			// Gray image
			$len = 2*$w;
			for($i=0;$i<$h;$i++)
			{
				$pos = (1+$len)*$i;
				$color .= $data[$pos];
				$alpha .= $data[$pos];
				$line = substr($data,$pos+1,$len);
				$color .= preg_replace('/(.)./s','$1',$line);
				$alpha .= preg_replace('/.(.)/s','$1',$line);
			}
		}
		else
		{
			// RGB image
			$len = 4*$w;
			for($i=0;$i<$h;$i++)
			{
				$pos = (1+$len)*$i;
				$color .= $data[$pos];
				$alpha .= $data[$pos];
				$line = substr($data,$pos+1,$len);
				$color .= preg_replace('/(.{3})./s','$1',$line);
				$alpha .= preg_replace('/.{3}(.)/s','$1',$line);
			}
		}
		unset($data);
		$data = gzcompress($color);
		$info['smask'] = gzcompress($alpha);
		$this->WithAlpha = true;
		if($this->PDFVersion<'1.4')
			$this->PDFVersion = '1.4';
	}
	$info['data'] = $data;
	return $info;
}

protected function _readstream($f, $n)
{
	// Read n bytes from stream
	$res = '';
	while($n>0 && !feof($f))
	{
		$s = fread($f,$n);
		if($s===false)
			$this->Error('Error while reading stream');
		$n -= strlen($s);
		$res .= $s;
	}
	if($n>0)
		$this->Error('Unexpected end of stream');
	return $res;
}

protected function _readint($f)
{
	// Read a 4-byte integer from stream
	$a = unpack('Ni',$this->_readstream($f,4));
	return $a['i'];
}

protected function _parsegif($file)
{
	// Extract info from a GIF file (via PNG conversion)
	if(!function_exists('imagepng'))
		$this->Error('GD extension is required for GIF support');
	if(!function_exists('imagecreatefromgif'))
		$this->Error('GD has no GIF read support');
	$im = imagecreatefromgif($file);
	if(!$im)
		$this->Error('Missing or incorrect image file: '.$file);
	imageinterlace($im,0);
	ob_start();
	imagepng($im);
	$data = ob_get_clean();
	imagedestroy($im);
	$f = fopen('php://temp','rb+');
	if(!$f)
		$this->Error('Unable to create memory stream');
	fwrite($f,$data);
	rewind($f);
	$info = $this->_parsepngstream($f,$file);
	fclose($f);
	return $info;
}

protected function _out($s)
{
	// Add a line to the document
	if($this->state==2)
		$this->pages[$this->page] .= $s."\n";
	elseif($this->state==1)
		$this->_put($s);
	elseif($this->state==0)
		$this->Error('No page has been added yet');
	elseif($this->state==3)
		$this->Error('The document is closed');
}

protected function _put($s)
{
	$this->buffer .= $s."\n";
}

protected function _getoffset()
{
	return strlen($this->buffer);
}

protected function _newobj($n=null)
{
	// Begin a new object
	if($n===null)
		$n = ++$this->n;
	$this->offsets[$n] = $this->_getoffset();
	$this->_put($n.' 0 obj');
}

protected function _putstream($data)
{
	$this->_put('stream');
	$this->_put($data);
	$this->_put('endstream');
}

protected function _putstreamobject($data)
{
	if($this->compress)
	{
		$entries = '/Filter /FlateDecode ';
		$data = gzcompress($data);
	}
	else
		$entries = '';
	$entries .= '/Length '.strlen($data);
	$this->_newobj();
	$this->_put('<<'.$entries.'>>');
	$this->_putstream($data);
	$this->_put('endobj');
}

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>>');
	$this->_put('/Contents '.($this->n+1).' 0 R>>');
	$this->_put('endobj');
	// Page content
	if(!empty($this->AliasNbPages))
		$this->pages[$n] = str_replace($this->AliasNbPages,$this->page,$this->pages[$n]);
	$this->_putstreamobject($this->pages[$n]);
	// Annotations
	foreach($this->PageLinks[$n] as $pl)
	{
		$this->_newobj();
		$rect = sprintf('%.2F %.2F %.2F %.2F',$pl[0],$pl[1],$pl[0]+$pl[2],$pl[1]-$pl[3]);
		$s = '<</Type /Annot /Subtype /Link /Rect ['.$rect.'] /Border [0 0 0] ';
		if(is_string($pl[4]))
			$s .= '/A <</S /URI /URI '.$this->_textstring($pl[4]).'>>>>';
		else
		{
			$l = $this->links[$pl[4]];
			if(isset($this->PageInfo[$l[0]]['size']))
				$h = $this->PageInfo[$l[0]]['size'][1];
			else
				$h = ($this->DefOrientation=='P') ? $this->DefPageSize[1]*$this->k : $this->DefPageSize[0]*$this->k;
			$s .= sprintf('/Dest [%d 0 R /XYZ 0 %.2F null]>>',$this->PageInfo[$l[0]]['n'],$h-$l[1]*$this->k);
		}
		$this->_put($s);
		$this->_put('endobj');
	}
}

protected function _putpages()
{
	$nb = $this->page;
	$n = $this->n;
	for($i=1;$i<=$nb;$i++)
	{
		$this->PageInfo[$i]['n'] = ++$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 _putfonts()
{
	foreach($this->FontFiles as $file=>$info)
	{
		// Font file embedding
		$this->_newobj();
		$this->FontFiles[$file]['n'] = $this->n;
		$font = file_get_contents($this->fontpath.$file,true);
		if(!$font)
			$this->Error('Font file not found: '.$file);
		$compressed = (substr($file,-2)=='.z');
		if(!$compressed && isset($info['length2']))
			$font = substr($font,6,$info['length1']).substr($font,6+$info['length1']+6,$info['length2']);
		$this->_put('<</Length '.strlen($font));
		if($compressed)
			$this->_put('/Filter /FlateDecode');
		$this->_put('/Length1 '.$info['length1']);
		if(isset($info['length2']))
			$this->_put('/Length2 '.$info['length2'].' /Length3 0');
		$this->_put('>>');
		$this->_putstream($font);
		$this->_put('endobj');
	}
	foreach($this->fonts as $k=>$font)
	{
		// Encoding
		if(isset($font['diff']))
		{
			if(!isset($this->encodings[$font['enc']]))
			{
				$this->_newobj();
				$this->_put('<</Type /Encoding /BaseEncoding /WinAnsiEncoding /Differences ['.$font['diff'].']>>');
				$this->_put('endobj');
				$this->encodings[$font['enc']] = $this->n;
			}
		}
		// ToUnicode CMap
		if(isset($font['uv']))
		{
			if(isset($font['enc']))
				$cmapkey = $font['enc'];
			else
				$cmapkey = $font['name'];
			if(!isset($this->cmaps[$cmapkey]))
			{
				$cmap = $this->_tounicodecmap($font['uv']);
				$this->_putstreamobject($cmap);
				$this->cmaps[$cmapkey] = $this->n;
			}
		}
		// Font object
		$this->fonts[$k]['n'] = $this->n+1;
		$type = $font['type'];
		$name = $font['name'];
		if($font['subsetted'])
			$name = 'AAAAAA+'.$name;
		if($type=='Core')
		{
			// Core font
			$this->_newobj();
			$this->_put('<</Type /Font');
			$this->_put('/BaseFont /'.$name);
			$this->_put('/Subtype /Type1');
			if($name!='Symbol' && $name!='ZapfDingbats')
				$this->_put('/Encoding /WinAnsiEncoding');
			if(isset($font['uv']))
				$this->_put('/ToUnicode '.$this->cmaps[$cmapkey].' 0 R');
			$this->_put('>>');
			$this->_put('endobj');
		}
		elseif($type=='Type1' || $type=='TrueType')
		{
			// Additional Type1 or TrueType/OpenType font
			$this->_newobj();
			$this->_put('<</Type /Font');
			$this->_put('/BaseFont /'.$name);
			$this->_put('/Subtype /'.$type);
			$this->_put('/FirstChar 32 /LastChar 255');
			$this->_put('/Widths '.($this->n+1).' 0 R');
			$this->_put('/FontDescriptor '.($this->n+2).' 0 R');
			if(isset($font['diff']))
				$this->_put('/Encoding '.$this->encodings[$font['enc']].' 0 R');
			else
				$this->_put('/Encoding /WinAnsiEncoding');
			if(isset($font['uv']))
				$this->_put('/ToUnicode '.$this->cmaps[$cmapkey].' 0 R');
			$this->_put('>>');
			$this->_put('endobj');
			// Widths
			$this->_newobj();
			$cw = &$font['cw'];
			$s = '[';
			for($i=32;$i<=255;$i++)
				$s .= $cw[chr($i)].' ';
			$this->_put($s.']');
			$this->_put('endobj');
			// Descriptor
			$this->_newobj();
			$s = '<</Type /FontDescriptor /FontName /'.$name;
			foreach($font['desc'] as $k=>$v)
				$s .= ' /'.$k.' '.$v;
			if(!empty($font['file']))
				$s .= ' /FontFile'.($type=='Type1' ? '' : '2').' '.$this->FontFiles[$font['file']]['n'].' 0 R';
			$this->_put($s.'>>');
			$this->_put('endobj');
		}
		else
		{
			// Allow for additional types
			$mtd = '_put'.strtolower($type);
			if(!method_exists($this,$mtd))
				$this->Error('Unsupported font type: '.$type);
			$this->$mtd($font);
		}
	}
}

protected function _tounicodecmap($uv)
{
	$ranges = '';
	$nbr = 0;
	$chars = '';
	$nbc = 0;
	foreach($uv as $c=>$v)
	{
		if(is_array($v))
		{
			$ranges .= sprintf("<%02X> <%02X> <%04X>\n",$c,$c+$v[1]-1,$v[0]);
			$nbr++;
		}
		else
		{
			$chars .= sprintf("<%02X> <%04X>\n",$c,$v);
			$nbc++;
		}
	}
	$s = "/CIDInit /ProcSet findresource begin\n";
	$s .= "12 dict begin\n";
	$s .= "begincmap\n";
	$s .= "/CIDSystemInfo\n";
	$s .= "<</Registry (Adobe)\n";
	$s .= "/Ordering (UCS)\n";
	$s .= "/Supplement 0\n";
	$s .= ">> def\n";
	$s .= "/CMapName /Adobe-Identity-UCS def\n";
	$s .= "/CMapType 2 def\n";
	$s .= "1 begincodespacerange\n";
	$s .= "<00> <FF>\n";
	$s .= "endcodespacerange\n";
	if($nbr>0)
	{
		$s .= "$nbr beginbfrange\n";
		$s .= $ranges;
		$s .= "endbfrange\n";
	}
	if($nbc>0)
	{
		$s .= "$nbc beginbfchar\n";
		$s .= $chars;
		$s .= "endbfchar\n";
	}
	$s .= "endcmap\n";
	$s .= "CMapName currentdict /CMap defineresource pop\n";
	$s .= "end\n";
	$s .= "end";
	return $s;
}

protected function _putimages()
{
	foreach(array_keys($this->images) as $file)
	{
		$this->_putimage($this->images[$file]);
		unset($this->images[$file]['data']);
		unset($this->images[$file]['smask']);
	}
}

protected function _putimage(&$info)
{
	$this->_newobj();
	$info['n'] = $this->n;
	$this->_put('<</Type /XObject');
	$this->_put('/Subtype /Image');
	$this->_put('/Width '.$info['w']);
	$this->_put('/Height '.$info['h']);
	if($info['cs']=='Indexed')
		$this->_put('/ColorSpace [/Indexed /DeviceRGB '.(strlen($info['pal'])/3-1).' '.($this->n+1).' 0 R]');
	else
	{
		$this->_put('/ColorSpace /'.$info['cs']);
		if($info['cs']=='DeviceCMYK')
			$this->_put('/Decode [1 0 1 0 1 0 1 0]');
	}
	$this->_put('/BitsPerComponent '.$info['bpc']);
	if(isset($info['f']))
		$this->_put('/Filter /'.$info['f']);
	if(isset($info['dp']))
		$this->_put('/DecodeParms <<'.$info['dp'].'>>');
	if(isset($info['trns']) && is_array($info['trns']))
	{
		$trns = '';
		for($i=0;$i<count($info['trns']);$i++)
			$trns .= $info['trns'][$i].' '.$info['trns'][$i].' ';
		$this->_put('/Mask ['.$trns.']');
	}
	if(isset($info['smask']))
		$this->_put('/SMask '.($this->n+1).' 0 R');
	$this->_put('/Length '.strlen($info['data']).'>>');
	$this->_putstream($info['data']);
	$this->_put('endobj');
	// Soft mask
	if(isset($info['smask']))
	{
		$dp = '/Predictor 15 /Colors 1 /BitsPerComponent 8 /Columns '.$info['w'];
		$smask = array('w'=>$info['w'], 'h'=>$info['h'], 'cs'=>'DeviceGray', 'bpc'=>8, 'f'=>$info['f'], 'dp'=>$dp, 'data'=>$info['smask']);
		$this->_putimage($smask);
	}
	// Palette
	if($info['cs']=='Indexed')
		$this->_putstreamobject($info['pal']);
}

protected function _putxobjectdict()
{
	foreach($this->images as $image)
		$this->_put('/I'.$image['i'].' '.$image['n'].' 0 R');
}

protected function _putresourcedict()
{
	$this->_put('/ProcSet [/PDF /Text /ImageB /ImageC /ImageI]');
	$this->_put('/Font <<');
	foreach($this->fonts as $font)
		$this->_put('/F'.$font['i'].' '.$font['n'].' 0 R');
	$this->_put('>>');
	$this->_put('/XObject <<');
	$this->_putxobjectdict();
	$this->_put('>>');
}

protected function _putresources()
{
	$this->_putfonts();
	$this->_putimages();
	// Resource dictionary
	$this->_newobj(2);
	$this->_put('<<');
	$this->_putresourcedict();
	$this->_put('>>');
	$this->_put('endobj');
}

protected function _putinfo()
{
	$this->metadata['Producer'] = 'FPDF '.FPDF_VERSION;
	$this->metadata['CreationDate'] = 'D:'.@date('YmdHis');
	foreach($this->metadata as $key=>$value)
		$this->_put('/'.$key.' '.$this->_textstring($value));
}

protected function _putcatalog()
{
	$n = $this->PageInfo[1]['n'];
	$this->_put('/Type /Catalog');
	$this->_put('/Pages 1 0 R');
	if($this->ZoomMode=='fullpage')
		$this->_put('/OpenAction ['.$n.' 0 R /Fit]');
	elseif($this->ZoomMode=='fullwidth')
		$this->_put('/OpenAction ['.$n.' 0 R /FitH null]');
	elseif($this->ZoomMode=='real')
		$this->_put('/OpenAction ['.$n.' 0 R /XYZ null null 1]');
	elseif(!is_string($this->ZoomMode))
		$this->_put('/OpenAction ['.$n.' 0 R /XYZ null null '.sprintf('%.2F',$this->ZoomMode/100).']');
	if($this->LayoutMode=='single')
		$this->_put('/PageLayout /SinglePage');
	elseif($this->LayoutMode=='continuous')
		$this->_put('/PageLayout /OneColumn');
	elseif($this->LayoutMode=='two')
		$this->_put('/PageLayout /TwoColumnLeft');
}

protected function _putheader()
{
	$this->_put('%PDF-'.$this->PDFVersion);
}

protected function _puttrailer()
{
	$this->_put('/Size '.($this->n+1));
	$this->_put('/Root '.$this->n.' 0 R');
	$this->_put('/Info '.($this->n-1).' 0 R');
}

protected function _enddoc()
{
	$this->_putheader();
	$this->_putpages();
	$this->_putresources();
	// Info
	$this->_newobj();
	$this->_put('<<');
	$this->_putinfo();
	$this->_put('>>');
	$this->_put('endobj');
	// Catalog
	$this->_newobj();
	$this->_put('<<');
	$this->_putcatalog();
	$this->_put('>>');
	$this->_put('endobj');
	// Cross-ref
	$offset = $this->_getoffset();
	$this->_put('xref');
	$this->_put('0 '.($this->n+1));
	$this->_put('0000000000 65535 f ');
	for($i=1;$i<=$this->n;$i++)
		$this->_put(sprintf('%010d 00000 n ',$this->offsets[$i]));
	// Trailer
	$this->_put('trailer');
	$this->_put('<<');
	$this->_puttrailer();
	$this->_put('>>');
	$this->_put('startxref');
	$this->_put($offset);
	$this->_put('%%EOF');
	$this->state = 3;
}
}
?>

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