/phpmyadmin/libraries/tcpdf/tcpdf.php

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<?php
//============================================================+
// File name   : tcpdf.php
// Version     : 5.9.039
// Begin       : 2002-08-03
// Last Update : 2011-01-12
// Author      : Nicola Asuni - Tecnick.com S.r.l - Via Della Pace, 11 - 09044 - Quartucciu (CA) - ITALY - www.tecnick.com - info@tecnick.com
// License     : http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT GNU-LGPLv3 + YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE GENERATED PDF DOCUMENTS.
// -------------------------------------------------------------------
// Copyright (C) 2002-2011  Nicola Asuni - Tecnick.com S.r.l.
//
// This file is part of TCPDF software library.
//
// TCPDF is free software: you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version. Additionally,
// YOU CAN'T REMOVE ANY TCPDF COPYRIGHT NOTICE OR LINK FROM THE
// GENERATED PDF DOCUMENTS.
//
// TCPDF is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the License
// along with TCPDF. If not, see
// <http://www.tecnick.com/pagefiles/tcpdf/LICENSE.TXT>.
//
// See LICENSE.TXT file for more information.
// -------------------------------------------------------------------
//
// Description : This is a PHP class for generating PDF documents without
//               requiring external extensions.
//
// NOTE:
//   This class was originally derived in 2002 from the Public
//   Domain FPDF class by Olivier Plathey (http://www.fpdf.org),
//   but now is almost entirely rewritten and contains thousands of
//   new lines of code and hundreds new features.
//
// Main features:
//  * no external libraries are required for the basic functions;
//  * all standard page formats, custom page formats, custom margins and units of measure;
//  * UTF-8 Unicode and Right-To-Left languages;
//  * TrueTypeUnicode, OpenTypeUnicode, TrueType, OpenType, Type1 and CID-0 fonts;
//  * font subsetting;
//  * methods to publish some XHTML + CSS code, Javascript and Forms;
//  * images, graphic (geometric figures) and transformation methods;
//  * supports JPEG, PNG and SVG images natively, all images supported by GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM) and all images supported via ImagMagick (http://www.imagemagick.org/www/formats.html)
//  * 1D and 2D barcodes: CODE 39, ANSI MH10.8M-1983, USD-3, 3 of 9, CODE 93, USS-93, Standard 2 of 5, Interleaved 2 of 5, CODE 128 A/B/C, 2 and 5 Digits UPC-Based Extention, EAN 8, EAN 13, UPC-A, UPC-E, MSI, POSTNET, PLANET, RMS4CC (Royal Mail 4-state Customer Code), CBC (Customer Bar Code), KIX (Klant index - Customer index), Intelligent Mail Barcode, Onecode, USPS-B-3200, CODABAR, CODE 11, PHARMACODE, PHARMACODE TWO-TRACKS, QR-Code, PDF417;
//  * Grayscale, RGB, CMYK, Spot Colors and Transparencies;
//  * automatic page header and footer management;
//  * document encryption up to 256 bit and digital signature certifications;
//  * transactions to UNDO commands;
//  * PDF annotations, including links, text and file attachments;
//  * text rendering modes (fill, stroke and clipping);
//  * multiple columns mode;
//  * no-write page regions;
//  * bookmarks and table of content;
//  * text hyphenation;
//  * text stretching and spacing (tracking/kerning);
//  * automatic page break, line break and text alignments including justification;
//  * automatic page numbering and page groups;
//  * move and delete pages;
//  * page compression (requires php-zlib extension);
//  * XOBject Templates;
//
// -----------------------------------------------------------
// THANKS TO:
//
// Olivier Plathey (http://www.fpdf.org) for original FPDF.
// Efthimios Mavrogeorgiadis (emavro@yahoo.com) for suggestions on RTL language support.
// Klemen Vodopivec (http://www.fpdf.de/downloads/addons/37/) for Encryption algorithm.
// Warren Sherliker (wsherliker@gmail.com) for better image handling.
// dullus for text Justification.
// Bob Vincent (pillarsdotnet@users.sourceforge.net) for <li> value attribute.
// Patrick Benny for text stretch suggestion on Cell().
// Johannes Güntert for JavaScript support.
// Denis Van Nuffelen for Dynamic Form.
// Jacek Czekaj for multibyte justification
// Anthony Ferrara for the reintroduction of legacy image methods.
// Sourceforge user 1707880 (hucste) for line-trough mode.
// Larry Stanbery for page groups.
// Martin Hall-May for transparency.
// Aaron C. Spike for Polycurve method.
// Mohamad Ali Golkar, Saleh AlMatrafe, Charles Abbott for Arabic and Persian support.
// Moritz Wagner and Andreas Wurmser for graphic functions.
// Andrew Whitehead for core fonts support.
// Esteban Joël Marín for OpenType font conversion.
// Teus Hagen for several suggestions and fixes.
// Yukihiro Nakadaira for CID-0 CJK fonts fixes.
// Kosmas Papachristos for some CSS improvements.
// Marcel Partap for some fixes.
// Won Kyu Park for several suggestions, fixes and patches.
// Dominik Dzienia for QR-code support.
// Laurent Minguet for some suggestions.
// Christian Deligant for some suggestions and fixes.
// Anyone that has reported a bug or sent a suggestion.
//============================================================+

/**
 * @file
 * This is a PHP class for generating PDF documents without requiring external extensions.<br>
 * TCPDF project (http://www.tcpdf.org) was originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
 * <h3>TCPDF main features are:</h3>
 * <ul>
 * <li>no external libraries are required for the basic functions;</li>
 * <li>all standard page formats, custom page formats, custom margins and units of measure;</li>
 * <li>UTF-8 Unicode and Right-To-Left languages;</li>
 * <li>TrueTypeUnicode, OpenTypeUnicode, TrueType, OpenType, Type1 and CID-0 fonts;</li>
 * <li>font subsetting;</li>
 * <li>methods to publish some XHTML + CSS code, Javascript and Forms;</li>
 * <li>images, graphic (geometric figures) and transformation methods;
 * <li>supports JPEG, PNG and SVG images natively, all images supported by GD (GD, GD2, GD2PART, GIF, JPEG, PNG, BMP, XBM, XPM) and all images supported via ImagMagick (http://www.imagemagick.org/www/formats.html)</li>
 * <li>1D and 2D barcodes: CODE 39, ANSI MH10.8M-1983, USD-3, 3 of 9, CODE 93, USS-93, Standard 2 of 5, Interleaved 2 of 5, CODE 128 A/B/C, 2 and 5 Digits UPC-Based Extention, EAN 8, EAN 13, UPC-A, UPC-E, MSI, POSTNET, PLANET, RMS4CC (Royal Mail 4-state Customer Code), CBC (Customer Bar Code), KIX (Klant index - Customer index), Intelligent Mail Barcode, Onecode, USPS-B-3200, CODABAR, CODE 11, PHARMACODE, PHARMACODE TWO-TRACKS, QR-Code, PDF417;</li>
 * <li>Grayscale, RGB, CMYK, Spot Colors and Transparencies;</li>
 * <li>automatic page header and footer management;</li>
 * <li>document encryption up to 256 bit and digital signature certifications;</li>
 * <li>transactions to UNDO commands;</li>
 * <li>PDF annotations, including links, text and file attachments;</li>
 * <li>text rendering modes (fill, stroke and clipping);</li>
 * <li>multiple columns mode;</li>
 * <li>no-write page regions;</li>
 * <li>bookmarks and table of content;</li>
 * <li>text hyphenation;</li>
 * <li>text stretching and spacing (tracking/kerning);</li>
 * <li>automatic page break, line break and text alignments including justification;</li>
 * <li>automatic page numbering and page groups;</li>
 * <li>move and delete pages;</li>
 * <li>page compression (requires php-zlib extension);</li>
 * <li>XOBject Templates;</li>
 * </ul>
 * Tools to encode your unicode fonts are on fonts/utils directory.</p>
 * @package com.tecnick.tcpdf
 * @author Nicola Asuni
 * @version 5.9.039
 */

// Main configuration file. Define the K_TCPDF_EXTERNAL_CONFIG constant to skip this file.
require_once(dirname(__FILE__).'/config/tcpdf_config.php');

/**
 * @class TCPDF
 * PHP class for generating PDF documents without requiring external extensions.
 * TCPDF project (http://www.tcpdf.org) has been originally derived in 2002 from the Public Domain FPDF class by Olivier Plathey (http://www.fpdf.org), but now is almost entirely rewritten.<br>
 * @package com.tecnick.tcpdf
 * @brief PHP class for generating PDF documents without requiring external extensions.
 * @version 5.9.039
 * @author Nicola Asuni - info@tecnick.com
 */
class TCPDF {

    // private properties

    /**
     * Current TCPDF version.
     * @private
     */
    private $tcpdf_version = '5.9.039';

    // Protected properties

    /**
     * Current page number.
     * @protected
     */
    protected $page;

    /**
     * Current object number.
     * @protected
     */
    protected $n;

    /**
     * Array of object offsets.
     * @protected
     */
    protected $offsets;

    /**
     * Buffer holding in-memory PDF.
     * @protected
     */
    protected $buffer;

    /**
     * Array containing pages.
     * @protected
     */
    protected $pages = array();

    /**
     * Current document state.
     * @protected
     */
    protected $state;

    /**
     * Compression flag.
     * @protected
     */
    protected $compress;

    /**
     * Current page orientation (P = Portrait, L = Landscape).
     * @protected
     */
    protected $CurOrientation;

    /**
     * Page dimensions.
     * @protected
     */
    protected $pagedim = array();

    /**
     * Scale factor (number of points in user unit).
     * @protected
     */
    protected $k;

    /**
     * Width of page format in points.
     * @protected
     */
    protected $fwPt;

    /**
     * Height of page format in points.
     * @protected
     */
    protected $fhPt;

    /**
     * Current width of page in points.
     * @protected
     */
    protected $wPt;

    /**
     * Current height of page in points.
     * @protected
     */
    protected $hPt;

    /**
     * Current width of page in user unit.
     * @protected
     */
    protected $w;

    /**
     * Current height of page in user unit.
     * @protected
     */
    protected $h;

    /**
     * Left margin.
     * @protected
     */
    protected $lMargin;

    /**
     * Top margin.
     * @protected
     */
    protected $tMargin;

    /**
     * Right margin.
     * @protected
     */
    protected $rMargin;

    /**
     * Page break margin.
     * @protected
     */
    protected $bMargin;

    /**
     * Array of cell internal paddings ('T' => top, 'R' => right, 'B' => bottom, 'L' => left).
     * @since 5.9.000 (2010-10-03)
     * @protected
     */
    protected $cell_padding = array('T' => 0, 'R' => 0, 'B' => 0, 'L' => 0);

    /**
     * Array of cell margins ('T' => top, 'R' => right, 'B' => bottom, 'L' => left).
     * @since 5.9.000 (2010-10-04)
     * @protected
     */
    protected $cell_margin = array('T' => 0, 'R' => 0, 'B' => 0, 'L' => 0);

    /**
     * Current horizontal position in user unit for cell positioning.
     * @protected
     */
    protected $x;

    /**
     * Current vertical position in user unit for cell positioning.
     * @protected
     */
    protected $y;

    /**
     * Height of last cell printed.
     * @protected
     */
    protected $lasth;

    /**
     * Line width in user unit.
     * @protected
     */
    protected $LineWidth;

    /**
     * Array of standard font names.
     * @protected
     */
    protected $CoreFonts;

    /**
     * Array of used fonts.
     * @protected
     */
    protected $fonts = array();

    /**
     * Array of font files.
     * @protected
     */
    protected $FontFiles = array();

    /**
     * Array of encoding differences.
     * @protected
     */
    protected $diffs = array();

    /**
     * Array of used images.
     * @protected
     */
    protected $images = array();

    /**
     * Array of Annotations in pages.
     * @protected
     */
    protected $PageAnnots = array();

    /**
     * Array of internal links.
     * @protected
     */
    protected $links = array();

    /**
     * Current font family.
     * @protected
     */
    protected $FontFamily;

    /**
     * Current font style.
     * @protected
     */
    protected $FontStyle;

    /**
     * Current font ascent (distance between font top and baseline).
     * @protected
     * @since 2.8.000 (2007-03-29)
     */
    protected $FontAscent;

    /**
     * Current font descent (distance between font bottom and baseline).
     * @protected
     * @since 2.8.000 (2007-03-29)
     */
    protected $FontDescent;

    /**
     * Underlining flag.
     * @protected
     */
    protected $underline;

    /**
     * Overlining flag.
     * @protected
     */
    protected $overline;

    /**
     * Current font info.
     * @protected
     */
    protected $CurrentFont;

    /**
     * Current font size in points.
     * @protected
     */
    protected $FontSizePt;

    /**
     * Current font size in user unit.
     * @protected
     */
    protected $FontSize;

    /**
     * Commands for drawing color.
     * @protected
     */
    protected $DrawColor;

    /**
     * Commands for filling color.
     * @protected
     */
    protected $FillColor;

    /**
     * Commands for text color.
     * @protected
     */
    protected $TextColor;

    /**
     * Indicates whether fill and text colors are different.
     * @protected
     */
    protected $ColorFlag;

    /**
     * Automatic page breaking.
     * @protected
     */
    protected $AutoPageBreak;

    /**
     * Threshold used to trigger page breaks.
     * @protected
     */
    protected $PageBreakTrigger;

    /**
     * Flag set when processing footer.
     * @protected
     */
    protected $InFooter = false;

    /**
     * Zoom display mode.
     * @protected
     */
    protected $ZoomMode;

    /**
     * Layout display mode.
     * @protected
     */
    protected $LayoutMode;

    /**
     * If true set the document information dictionary in Unicode.
     * @protected
     */
    protected $docinfounicode = true;

    /**
     * Document title.
     * @protected
     */
    protected $title = '';

    /**
     * Document subject.
     * @protected
     */
    protected $subject = '';

    /**
     * Document author.
     * @protected
     */
    protected $author = '';

    /**
     * Document keywords.
     * @protected
     */
    protected $keywords = '';

    /**
     * Document creator.
     * @protected
     */
    protected $creator = '';

    /**
     * String alias for total number of pages.
     * @protected
     */
    protected $AliasNbPages = '{nb}';

    /**
     * String alias for page number.
     * @protected
     */
    protected $AliasNumPage = '{pnb}';

    /**
     * The right-bottom (or left-bottom for RTL) corner X coordinate of last inserted image.
     * @since 2002-07-31
     * @author Nicola Asuni
     * @protected
     */
    protected $img_rb_x;

    /**
     * The right-bottom corner Y coordinate of last inserted image.
     * @since 2002-07-31
     * @author Nicola Asuni
     * @protected
     */
    protected $img_rb_y;

    /**
     * Adjusting factor to convert pixels to user units.
     * @since 2004-06-14
     * @author Nicola Asuni
     * @protected
     */
    protected $imgscale = 1;

    /**
     * Boolean flag set to true when the input text is unicode (require unicode fonts).
     * @since 2005-01-02
     * @author Nicola Asuni
     * @protected
     */
    protected $isunicode = false;

    /**
     * Object containing unicode data.
     * @since 5.9.004 (2010-10-18)
     * @author Nicola Asuni
     * @protected
     */
    protected $unicode;

    /**
     * PDF version.
     * @since 1.5.3
     * @protected
     */
    protected $PDFVersion = '1.7';

    /**
     * Minimum distance between header and top page margin.
     * @protected
     */
    protected $header_margin;

    /**
     * Minimum distance between footer and bottom page margin.
     * @protected
     */
    protected $footer_margin;

    /**
     * Original left margin value.
     * @protected
     * @since 1.53.0.TC013
     */
    protected $original_lMargin;

    /**
     * Original right margin value.
     * @protected
     * @since 1.53.0.TC013
     */
    protected $original_rMargin;

    /**
     * Default font used on page header.
     * @protected
     */
    protected $header_font;

    /**
     * Default font used on page footer.
     * @protected
     */
    protected $footer_font;

    /**
     * Language templates.
     * @protected
     */
    protected $l;

    /**
     * Barcode to print on page footer (only if set).
     * @protected
     */
    protected $barcode = false;

    /**
     * Boolean flag to print/hide page header.
     * @protected
     */
    protected $print_header = true;

    /**
     * Boolean flag to print/hide page footer.
     * @protected
     */
    protected $print_footer = true;

    /**
     * Header image logo.
     * @protected
     */
    protected $header_logo = '';

    /**
     * Width of header image logo in user units.
     * @protected
     */
    protected $header_logo_width = 30;

    /**
     * Title to be printed on default page header.
     * @protected
     */
    protected $header_title = '';

    /**
     * String to pring on page header after title.
     * @protected
     */
    protected $header_string = '';

    /**
     * Default number of columns for html table.
     * @protected
     */
    protected $default_table_columns = 4;

    // variables for html parser

    /**
     * HTML PARSER: array to store current link and rendering styles.
     * @protected
     */
    protected $HREF = array();

    /**
     * List of available fonts on filesystem.
     * @protected
     */
    protected $fontlist = array();

    /**
     * Current foreground color.
     * @protected
     */
    protected $fgcolor;

    /**
     * HTML PARSER: array of boolean values, true in case of ordered list (OL), false otherwise.
     * @protected
     */
    protected $listordered = array();

    /**
     * HTML PARSER: array count list items on nested lists.
     * @protected
     */
    protected $listcount = array();

    /**
     * HTML PARSER: current list nesting level.
     * @protected
     */
    protected $listnum = 0;

    /**
     * HTML PARSER: indent amount for lists.
     * @protected
     */
    protected $listindent = 0;

    /**
     * HTML PARSER: current list indententation level.
     * @protected
     */
    protected $listindentlevel = 0;

    /**
     * Current background color.
     * @protected
     */
    protected $bgcolor;

    /**
     * Temporary font size in points.
     * @protected
     */
    protected $tempfontsize = 10;

    /**
     * Spacer string for LI tags.
     * @protected
     */
    protected $lispacer = '';

    /**
     * Default encoding.
     * @protected
     * @since 1.53.0.TC010
     */
    protected $encoding = 'UTF-8';

    /**
     * PHP internal encoding.
     * @protected
     * @since 1.53.0.TC016
     */
    protected $internal_encoding;

    /**
     * Boolean flag to indicate if the document language is Right-To-Left.
     * @protected
     * @since 2.0.000
     */
    protected $rtl = false;

    /**
     * Boolean flag used to force RTL or LTR string direction.
     * @protected
     * @since 2.0.000
     */
    protected $tmprtl = false;

    // --- Variables used for document encryption:

    /**
     * IBoolean flag indicating whether document is protected.
     * @protected
     * @since 2.0.000 (2008-01-02)
     */
    protected $encrypted;

    /**
     * Array containing encryption settings.
     * @protected
     * @since 5.0.005 (2010-05-11)
     */
    protected $encryptdata = array();

    /**
     * Last RC4 key encrypted (cached for optimisation).
     * @protected
     * @since 2.0.000 (2008-01-02)
     */
    protected $last_enc_key;

    /**
     * Last RC4 computed key.
     * @protected
     * @since 2.0.000 (2008-01-02)
     */
    protected $last_enc_key_c;

    /**
     * Encryption padding string.
     * @protected
     */
    protected $enc_padding = "\x28\xBF\x4E\x5E\x4E\x75\x8A\x41\x64\x00\x4E\x56\xFF\xFA\x01\x08\x2E\x2E\x00\xB6\xD0\x68\x3E\x80\x2F\x0C\xA9\xFE\x64\x53\x69\x7A";

    /**
     * File ID (used on document trailer).
     * @protected
     * @since 5.0.005 (2010-05-12)
     */
    protected $file_id;

    // --- bookmark ---

    /**
     * Outlines for bookmark.
     * @protected
     * @since 2.1.002 (2008-02-12)
     */
    protected $outlines = array();

    /**
     * Outline root for bookmark.
     * @protected
     * @since 2.1.002 (2008-02-12)
     */
    protected $OutlineRoot;

    // --- javascript and form ---

    /**
     * Javascript code.
     * @protected
     * @since 2.1.002 (2008-02-12)
     */
    protected $javascript = '';

    /**
     * Javascript counter.
     * @protected
     * @since 2.1.002 (2008-02-12)
     */
    protected $n_js;

    /**
     * line trough state
     * @protected
     * @since 2.8.000 (2008-03-19)
     */
    protected $linethrough;

    /**
     * Array with additional document-wide usage rights for the document.
     * @protected
     * @since 5.8.014 (2010-08-23)
     */
    protected $ur = array();

    /**
     * DPI (Dot Per Inch) Document Resolution (do not change).
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $dpi = 72;

    /**
     * Array of page numbers were a new page group was started.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $newpagegroup = array();

    /**
     * Contains the number of pages of the groups.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $pagegroups;

    /**
     * Contains the alias of the current page group.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $currpagegroup;

    /**
     * Restrict the rendering of some elements to screen or printout.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $visibility = 'all';

    /**
     * Print visibility.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $n_ocg_print;

    /**
     * View visibility.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $n_ocg_view;

    /**
     * Array of transparency objects and parameters.
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $extgstates;

    /**
     * Set the default JPEG compression quality (1-100).
     * @protected
     * @since 3.0.000 (2008-03-27)
     */
    protected $jpeg_quality;

    /**
     * Default cell height ratio.
     * @protected
     * @since 3.0.014 (2008-05-23)
     */
    protected $cell_height_ratio = K_CELL_HEIGHT_RATIO;

    /**
     * PDF viewer preferences.
     * @protected
     * @since 3.1.000 (2008-06-09)
     */
    protected $viewer_preferences;

    /**
     * A name object specifying how the document should be displayed when opened.
     * @protected
     * @since 3.1.000 (2008-06-09)
     */
    protected $PageMode;

    /**
     * Array for storing gradient information.
     * @protected
     * @since 3.1.000 (2008-06-09)
     */
    protected $gradients = array();

    /**
     * Array used to store positions inside the pages buffer (keys are the page numbers).
     * @protected
     * @since 3.2.000 (2008-06-26)
     */
    protected $intmrk = array();

    /**
     * Array used to store positions inside the pages buffer (keys are the page numbers).
     * @protected
     * @since 5.7.000 (2010-08-03)
     */
    protected $bordermrk = array();

    /**
     * Array used to store page positions to track empty pages (keys are the page numbers).
     * @protected
     * @since 5.8.007 (2010-08-18)
     */
    protected $emptypagemrk = array();

    /**
     * Array used to store content positions inside the pages buffer (keys are the page numbers).
     * @protected
     * @since 4.6.021 (2009-07-20)
     */
    protected $cntmrk = array();

    /**
     * Array used to store footer positions of each page.
     * @protected
     * @since 3.2.000 (2008-07-01)
     */
    protected $footerpos = array();

    /**
     * Array used to store footer length of each page.
     * @protected
     * @since 4.0.014 (2008-07-29)
     */
    protected $footerlen = array();

    /**
     * Boolean flag to indicate if a new line is created.
     * @protected
     * @since 3.2.000 (2008-07-01)
     */
    protected $newline = true;

    /**
     * End position of the latest inserted line.
     * @protected
     * @since 3.2.000 (2008-07-01)
     */
    protected $endlinex = 0;

    /**
     * PDF string for width value of the last line.
     * @protected
     * @since 4.0.006 (2008-07-16)
     */
    protected $linestyleWidth = '';

    /**
     * PDF string for CAP value of the last line.
     * @protected
     * @since 4.0.006 (2008-07-16)
     */
    protected $linestyleCap = '0 J';

    /**
     * PDF string for join value of the last line.
     * @protected
     * @since 4.0.006 (2008-07-16)
     */
    protected $linestyleJoin = '0 j';

    /**
     * PDF string for dash value of the last line.
     * @protected
     * @since 4.0.006 (2008-07-16)
     */
    protected $linestyleDash = '[] 0 d';

    /**
     * Boolean flag to indicate if marked-content sequence is open.
     * @protected
     * @since 4.0.013 (2008-07-28)
     */
    protected $openMarkedContent = false;

    /**
     * Count the latest inserted vertical spaces on HTML.
     * @protected
     * @since 4.0.021 (2008-08-24)
     */
    protected $htmlvspace = 0;

    /**
     * Array of Spot colors.
     * @protected
     * @since 4.0.024 (2008-09-12)
     */
    protected $spot_colors = array();

    /**
     * Symbol used for HTML unordered list items.
     * @protected
     * @since 4.0.028 (2008-09-26)
     */
    protected $lisymbol = '';

    /**
     * String used to mark the beginning and end of EPS image blocks.
     * @protected
     * @since 4.1.000 (2008-10-18)
     */
    protected $epsmarker = 'x#!#EPS#!#x';

    /**
     * Array of transformation matrix.
     * @protected
     * @since 4.2.000 (2008-10-29)
     */
    protected $transfmatrix = array();

    /**
     * Current key for transformation matrix.
     * @protected
     * @since 4.8.005 (2009-09-17)
     */
    protected $transfmatrix_key = 0;

    /**
     * Booklet mode for double-sided pages.
     * @protected
     * @since 4.2.000 (2008-10-29)
     */
    protected $booklet = false;

    /**
     * Epsilon value used for float calculations.
     * @protected
     * @since 4.2.000 (2008-10-29)
     */
    protected $feps = 0.005;

    /**
     * Array used for custom vertical spaces for HTML tags.
     * @protected
     * @since 4.2.001 (2008-10-30)
     */
    protected $tagvspaces = array();

    /**
     * HTML PARSER: custom indent amount for lists. Negative value means disabled.
     * @protected
     * @since 4.2.007 (2008-11-12)
     */
    protected $customlistindent = -1;

    /**
     * Boolean flag to indicate if the border of the cell sides that cross the page should be removed.
     * @protected
     * @since 4.2.010 (2008-11-14)
     */
    protected $opencell = true;

    /**
     * Array of files to embedd.
     * @protected
     * @since 4.4.000 (2008-12-07)
     */
    protected $embeddedfiles = array();

    /**
     * Boolean flag to indicate if we are inside a PRE tag.
     * @protected
     * @since 4.4.001 (2008-12-08)
     */
    protected $premode = false;

    /**
     * Array used to store positions of graphics transformation blocks inside the page buffer.
     * keys are the page numbers
     * @protected
     * @since 4.4.002 (2008-12-09)
     */
    protected $transfmrk = array();

    /**
     * Default color for html links.
     * @protected
     * @since 4.4.003 (2008-12-09)
     */
    protected $htmlLinkColorArray = array(0, 0, 255);

    /**
     * Default font style to add to html links.
     * @protected
     * @since 4.4.003 (2008-12-09)
     */
    protected $htmlLinkFontStyle = 'U';

    /**
     * Counts the number of pages.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $numpages = 0;

    /**
     * Array containing page lengths in bytes.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $pagelen = array();

    /**
     * Counts the number of pages.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $numimages = 0;

    /**
     * Store the image keys.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $imagekeys = array();

    /**
     * Length of the buffer in bytes.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $bufferlen = 0;

    /**
     * If true enables disk caching.
     * @protected
     * @since 4.5.000 (2008-12-31)
     */
    protected $diskcache = false;

    /**
     * Counts the number of fonts.
     * @protected
     * @since 4.5.000 (2009-01-02)
     */
    protected $numfonts = 0;

    /**
     * Store the font keys.
     * @protected
     * @since 4.5.000 (2009-01-02)
     */
    protected $fontkeys = array();

    /**
     * Store the font object IDs.
     * @protected
     * @since 4.8.001 (2009-09-09)
     */
    protected $font_obj_ids = array();

    /**
     * Store the fage status (true when opened, false when closed).
     * @protected
     * @since 4.5.000 (2009-01-02)
     */
    protected $pageopen = array();

    /**
     * Default monospace font.
     * @protected
     * @since 4.5.025 (2009-03-10)
     */
    protected $default_monospaced_font = 'courier';

    /**
     * Cloned copy of the current class object.
     * @protected
     * @since 4.5.029 (2009-03-19)
     */
    protected $objcopy;

    /**
     * Array used to store the lengths of cache files.
     * @protected
     * @since 4.5.029 (2009-03-19)
     */
    protected $cache_file_length = array();

    /**
     * Table header content to be repeated on each new page.
     * @protected
     * @since 4.5.030 (2009-03-20)
     */
    protected $thead = '';

    /**
     * Margins used for table header.
     * @protected
     * @since 4.5.030 (2009-03-20)
     */
    protected $theadMargins = array();

    /**
     * Cache array for UTF8StringToArray() method.
     * @protected
     * @since 4.5.037 (2009-04-07)
     */
    protected $cache_UTF8StringToArray = array();

    /**
     * Maximum size of cache array used for UTF8StringToArray() method.
     * @protected
     * @since 4.5.037 (2009-04-07)
     */
    protected $cache_maxsize_UTF8StringToArray = 8;

    /**
     * Current size of cache array used for UTF8StringToArray() method.
     * @protected
     * @since 4.5.037 (2009-04-07)
     */
    protected $cache_size_UTF8StringToArray = 0;

    /**
     * Boolean flag to enable document digital signature.
     * @protected
     * @since 4.6.005 (2009-04-24)
     */
    protected $sign = false;

    /**
     * Digital signature data.
     * @protected
     * @since 4.6.005 (2009-04-24)
     */
    protected $signature_data = array();

    /**
     * Digital signature max length.
     * @protected
     * @since 4.6.005 (2009-04-24)
     */
    protected $signature_max_length = 11742;

    /**
     * Data for digital signature appearance.
     * @protected
     * @since 5.3.011 (2010-06-16)
     */
    protected $signature_appearance = array('page' => 1, 'rect' => '0 0 0 0');

    /**
     * Regular expression used to find blank characters (required for word-wrapping).
     * @protected
     * @since 4.6.006 (2009-04-28)
     */
    protected $re_spaces = '/[^\S\xa0]/';

    /**
     * Array of $re_spaces parts.
     * @protected
     * @since 5.5.011 (2010-07-09)
     */
    protected $re_space = array('p' => '[^\S\xa0]', 'm' => '');

    /**
     * Digital signature object ID.
     * @protected
     * @since 4.6.022 (2009-06-23)
     */
    protected $sig_obj_id = 0;

    /**
     * ByteRange placemark used during digital signature process.
     * @protected
     * @since 4.6.028 (2009-08-25)
     */
    protected $byterange_string = '/ByteRange[0 ********** ********** **********]';

    /**
     * Placemark used during digital signature process.
     * @protected
     * @since 4.6.028 (2009-08-25)
     */
    protected $sig_annot_ref = '***SIGANNREF*** 0 R';

    /**
     * ID of page objects.
     * @protected
     * @since 4.7.000 (2009-08-29)
     */
    protected $page_obj_id = array();

    /**
     * List of form annotations IDs.
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $form_obj_id = array();

    /**
     * Deafult Javascript field properties. Possible values are described on official Javascript for Acrobat API reference. Annotation options can be directly specified using the 'aopt' entry.
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $default_form_prop = array('lineWidth'=>1, 'borderStyle'=>'solid', 'fillColor'=>array(255, 255, 255), 'strokeColor'=>array(128, 128, 128));

    /**
     * Javascript objects array.
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $js_objects = array();

    /**
     * Current form action (used during XHTML rendering).
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $form_action = '';

    /**
     * Current form encryption type (used during XHTML rendering).
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $form_enctype = 'application/x-www-form-urlencoded';

    /**
     * Current method to submit forms.
     * @protected
     * @since 4.8.000 (2009-09-07)
     */
    protected $form_mode = 'post';

    /**
     * List of fonts used on form fields (fontname => fontkey).
     * @protected
     * @since 4.8.001 (2009-09-09)
     */
    protected $annotation_fonts = array();

    /**
     * List of radio buttons parent objects.
     * @protected
     * @since 4.8.001 (2009-09-09)
     */
    protected $radiobutton_groups = array();

    /**
     * List of radio group objects IDs.
     * @protected
     * @since 4.8.001 (2009-09-09)
     */
    protected $radio_groups = array();

    /**
     * Text indentation value (used for text-indent CSS attribute).
     * @protected
     * @since 4.8.006 (2009-09-23)
     */
    protected $textindent = 0;

    /**
     * Store page number when startTransaction() is called.
     * @protected
     * @since 4.8.006 (2009-09-23)
     */
    protected $start_transaction_page = 0;

    /**
     * Store Y position when startTransaction() is called.
     * @protected
     * @since 4.9.001 (2010-03-28)
     */
    protected $start_transaction_y = 0;

    /**
     * True when we are printing the thead section on a new page.
     * @protected
     * @since 4.8.027 (2010-01-25)
     */
    protected $inthead = false;

    /**
     * Array of column measures (width, space, starting Y position).
     * @protected
     * @since 4.9.001 (2010-03-28)
     */
    protected $columns = array();

    /**
     * Number of colums.
     * @protected
     * @since 4.9.001 (2010-03-28)
     */
    protected $num_columns = 1;

    /**
     * Current column number.
     * @protected
     * @since 4.9.001 (2010-03-28)
     */
    protected $current_column = 0;

    /**
     * Starting page for columns.
     * @protected
     * @since 4.9.001 (2010-03-28)
     */
    protected $column_start_page = 0;

    /**
     * Maximum page and column selected.
     * @protected
     * @since 5.8.000 (2010-08-11)
     */
    protected $maxselcol = array('page' => 0, 'column' => 0);

    /**
     * Array of: X difference between table cell x start and starting page margin, cellspacing, cellpadding.
     * @protected
     * @since 5.8.000 (2010-08-11)
     */
    protected $colxshift = array('x' => 0, 's' => array('H' => 0, 'V' => 0), 'p' => array('L' => 0, 'T' => 0, 'R' => 0, 'B' => 0));

    /**
     * Text rendering mode: 0 = Fill text; 1 = Stroke text; 2 = Fill, then stroke text; 3 = Neither fill nor stroke text (invisible); 4 = Fill text and add to path for clipping; 5 = Stroke text and add to path for clipping; 6 = Fill, then stroke text and add to path for clipping; 7 = Add text to path for clipping.
     * @protected
     * @since 4.9.008 (2010-04-03)
     */
    protected $textrendermode = 0;

    /**
     * Text stroke width in doc units.
     * @protected
     * @since 4.9.008 (2010-04-03)
     */
    protected $textstrokewidth = 0;

    /**
     * Current stroke color.
     * @protected
     * @since 4.9.008 (2010-04-03)
     */
    protected $strokecolor;

    /**
     * Default unit of measure for document.
     * @protected
     * @since 5.0.000 (2010-04-22)
     */
    protected $pdfunit = 'mm';

    /**
     * Boolean flag true when we are on TOC (Table Of Content) page.
     * @protected
     */
    protected $tocpage = false;

    /**
     * Boolean flag: if true convert vector images (SVG, EPS) to raster image using GD or ImageMagick library.
     * @protected
     * @since 5.0.000 (2010-04-26)
     */
    protected $rasterize_vector_images = false;

    /**
     * Boolean flag: if true enables font subsetting by default.
     * @protected
     * @since 5.3.002 (2010-06-07)
     */
    protected $font_subsetting = true;

    /**
     * Array of default graphic settings.
     * @protected
     * @since 5.5.008 (2010-07-02)
     */
    protected $default_graphic_vars = array();

    /**
     * Array of XObjects.
     * @protected
     * @since 5.8.014 (2010-08-23)
     */
    protected $xobjects = array();

    /**
     * Boolean value true when we are inside an XObject.
     * @protected
     * @since 5.8.017 (2010-08-24)
     */
    protected $inxobj = false;

    /**
     * Current XObject ID.
     * @protected
     * @since 5.8.017 (2010-08-24)
     */
    protected $xobjid = '';

    /**
     * Percentage of character stretching.
     * @protected
     * @since 5.9.000 (2010-09-29)
     */
    protected $font_stretching = 100;

    /**
     * Increases or decreases the space between characters in a text by the specified amount (tracking/kerning).
     * @protected
     * @since 5.9.000 (2010-09-29)
     */
    protected $font_spacing = 0;

    /**
     * Array of no-write regions.
     * ('page' => page number or empy for current page, 'xt' => X top, 'yt' => Y top, 'xb' => X bottom, 'yb' => Y bottom, 'side' => page side 'L' = left or 'R' = right)
     * @protected
     * @since 5.9.003 (2010-10-14)
     */
    protected $page_regions = array();

    /**
     * Array containing HTML color names and values.
     * @protected
     * @since 5.9.004 (2010-10-18)
     */
    protected $webcolor = array();

    /**
     * Array containing spot color names and values.
     * @protected
     * @since 5.9.012 (2010-11-11)
     */
    protected $spotcolor = array();

    /**
     * Directory used for the last SVG image.
     * @protected
     * @since 5.0.000 (2010-05-05)
     */
    protected $svgdir = '';

    /**
     *  Deafult unit of measure for SVG.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgunit = 'px';

    /**
     * Array of SVG gradients.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svggradients = array();

    /**
     * ID of last SVG gradient.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svggradientid = 0;

    /**
     * Boolean value true when in SVG defs group.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgdefsmode = false;

    /**
     * Array of SVG defs.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgdefs = array();

    /**
     * Boolean value true when in SVG clipPath tag.
     * @protected
     * @since 5.0.000 (2010-04-26)
     */
    protected $svgclipmode = false;

    /**
     * Array of SVG clipPath commands.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgclippaths = array();

    /**
     * Array of SVG clipPath tranformation matrix.
     * @protected
     * @since 5.8.022 (2010-08-31)
     */
    protected $svgcliptm = array();

    /**
     * ID of last SVG clipPath.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgclipid = 0;

    /**
     * SVG text.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgtext = '';

    /**
     * SVG text properties.
     * @protected
     * @since 5.8.013 (2010-08-23)
     */
    protected $svgtextmode = array();

    /**
     * Array of hinheritable SVG properties.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svginheritprop = array('clip-rule', 'color', 'color-interpolation', 'color-interpolation-filters', 'color-profile', 'color-rendering', 'cursor', 'direction', 'fill', 'fill-opacity', 'fill-rule', 'font', 'font-family', 'font-size', 'font-size-adjust', 'font-stretch', 'font-style', 'font-variant', 'font-weight', 'glyph-orientation-horizontal', 'glyph-orientation-vertical', 'image-rendering', 'kerning', 'letter-spacing', 'marker', 'marker-end', 'marker-mid', 'marker-start', 'pointer-events', 'shape-rendering', 'stroke', 'stroke-dasharray', 'stroke-dashoffset', 'stroke-linecap', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'text-anchor', 'text-rendering', 'visibility', 'word-spacing', 'writing-mode');

    /**
     * Array of SVG properties.
     * @protected
     * @since 5.0.000 (2010-05-02)
     */
    protected $svgstyles = array(array(
        'alignment-baseline' => 'auto',
        'baseline-shift' => 'baseline',
        'clip' => 'auto',
        'clip-path' => 'none',
        'clip-rule' => 'nonzero',
        'color' => 'black',
        'color-interpolation' => 'sRGB',
        'color-interpolation-filters' => 'linearRGB',
        'color-profile' => 'auto',
        'color-rendering' => 'auto',
        'cursor' => 'auto',
        'direction' => 'ltr',
        'display' => 'inline',
        'dominant-baseline' => 'auto',
        'enable-background' => 'accumulate',
        'fill' => 'black',
        'fill-opacity' => 1,
        'fill-rule' => 'nonzero',
        'filter' => 'none',
        'flood-color' => 'black',
        'flood-opacity' => 1,
        'font' => '',
        'font-family' => 'helvetica',
        'font-size' => 'medium',
        'font-size-adjust' => 'none',
        'font-stretch' => 'normal',
        'font-style' => 'normal',
        'font-variant' => 'normal',
        'font-weight' => 'normal',
        'glyph-orientation-horizontal' => '0deg',
        'glyph-orientation-vertical' => 'auto',
        'image-rendering' => 'auto',
        'kerning' => 'auto',
        'letter-spacing' => 'normal',
        'lighting-color' => 'white',
        'marker' => '',
        'marker-end' => 'none',
        'marker-mid' => 'none',
        'marker-start' => 'none',
        'mask' => 'none',
        'opacity' => 1,
        'overflow' => 'auto',
        'pointer-events' => 'visiblePainted',
        'shape-rendering' => 'auto',
        'stop-color' => 'black',
        'stop-opacity' => 1,
        'stroke' => 'none',
        'stroke-dasharray' => 'none',
        'stroke-dashoffset' => 0,
        'stroke-linecap' => 'butt',
        'stroke-linejoin' => 'miter',
        'stroke-miterlimit' => 4,
        'stroke-opacity' => 1,
        'stroke-width' => 1,
        'text-anchor' => 'start',
        'text-decoration' => 'none',
        'text-rendering' => 'auto',
        'unicode-bidi' => 'normal',
        'visibility' => 'visible',
        'word-spacing' => 'normal',
        'writing-mode' => 'lr-tb',
        'text-color' => 'black',
        'transfmatrix' => array(1, 0, 0, 1, 0, 0)
        ));

    //------------------------------------------------------------
    // METHODS
    //------------------------------------------------------------

    /**
     * This is the class constructor.
     * It allows to set up the page format, the orientation and the measure unit used in all the methods (except for the font sizes).
     * @param $orientation (string) page orientation. Possible values are (case insensitive):<ul><li>P or Portrait (default)</li><li>L or Landscape</li><li>'' (empty string) for automatic orientation</li></ul>
     * @param $unit (string) User measure unit. Possible values are:<ul><li>pt: point</li><li>mm: millimeter (default)</li><li>cm: centimeter</li><li>in: inch</li></ul><br />A point equals 1/72 of inch, that is to say about 0.35 mm (an inch being 2.54 cm). This is a very common unit in typography; font sizes are expressed in that unit.
     * @param $format (mixed) The format used for pages. It can be either: one of the string values specified at getPageSizeFromFormat() or an array of parameters specified at setPageFormat().
     * @param $unicode (boolean) TRUE means that the input text is unicode (default = true)
     * @param $diskcache (boolean) if TRUE reduce the RAM memory usage by caching temporary data on filesystem (slower).
     * @param $encoding (string) charset encoding; default is UTF-8
     * @public
     * @see getPageSizeFromFormat(), setPageFormat()
     */
    public function __construct($orientation='P', $unit='mm', $format='A4', $unicode=true, $encoding='UTF-8', $diskcache=false) {
        /* Set internal character encoding to ASCII */
        if (function_exists('mb_internal_encoding') AND mb_internal_encoding()) {
            $this->internal_encoding = mb_internal_encoding();
            mb_internal_encoding('ASCII');
        }
        // get array of HTML colors
        require(dirname(__FILE__).'/htmlcolors.php');
        $this->webcolor = $webcolor;
        // get array of custom spot colors
        if (file_exists(dirname(__FILE__).'/spotcolors.php')) {
            require(dirname(__FILE__).'/spotcolors.php');
            $this->spotcolor = $spotcolor;
        } else {
            $this->spotcolor = array();
        }
        require_once(dirname(__FILE__).'/unicode_data.php');
        $this->unicode = new TCPDF_UNICODE_DATA();
        $this->font_obj_ids = array();
        $this->page_obj_id = array();
        $this->form_obj_id = array();
        // set disk caching
        $this->diskcache = $diskcache ? true : false;
        // set language direction
        $this->rtl = false;
        $this->tmprtl = false;
        // some checks
        $this->_dochecks();
        // initialization of properties
        $this->isunicode = $unicode;
        $this->page = 0;
        $this->transfmrk[0] = array();
        $this->pagedim = array();
        $this->n = 2;
        $this->buffer = '';
        $this->pages = array();
        $this->state = 0;
        $this->fonts = array();
        $this->FontFiles = array();
        $this->diffs = array();
        $this->images = array();
        $this->links = array();
        $this->gradients = array();
        $this->InFooter = false;
        $this->lasth = 0;
        $this->FontFamily = 'helvetica';
        $this->FontStyle = '';
        $this->FontSizePt = 12;
        $this->underline = false;
        $this->overline = false;
        $this->linethrough = false;
        $this->DrawColor = '0 G';
        $this->FillColor = '0 g';
        $this->TextColor = '0 g';
        $this->ColorFlag = false;
        // encryption values
        $this->encrypted = false;
        $this->last_enc_key = '';
        // standard Unicode fonts
        $this->CoreFonts = array(
            'courier'=>'Courier',
            'courierB'=>'Courier-Bold',
            'courierI'=>'Courier-Oblique',
            'courierBI'=>'Courier-BoldOblique',
            'helvetica'=>'Helvetica',
            'helveticaB'=>'Helvetica-Bold',
            'helveticaI'=>'Helvetica-Oblique',
            'helveticaBI'=>'Helvetica-BoldOblique',
            'times'=>'Times-Roman',
            'timesB'=>'Times-Bold',
            'timesI'=>'Times-Italic',
            'timesBI'=>'Times-BoldItalic',
            'symbol'=>'Symbol',
            'zapfdingbats'=>'ZapfDingbats'
        );
        // set scale factor
        $this->setPageUnit($unit);
        // set page format and orientation
        $this->setPageFormat($format, $orientation);
        // page margins (1 cm)
        $margin = 28.35 / $this->k;
        $this->SetMargins($margin, $margin);
        // internal cell padding
        $cpadding = $margin / 10;
        $this->setCellPaddings($cpadding, 0, $cpadding, 0);
        // cell margins
        $this->setCellMargins(0, 0, 0, 0);
        // line width (0.2 mm)
        $this->LineWidth = 0.57 / $this->k;
        $this->linestyleWidth = sprintf('%.2F w', ($this->LineWidth * $this->k));
        $this->linestyleCap = '0 J';
        $this->linestyleJoin = '0 j';
        $this->linestyleDash = '[] 0 d';
        // automatic page break
        $this->SetAutoPageBreak(true, (2 * $margin));
        // full width display mode
        $this->SetDisplayMode('fullwidth');
        // compression
        $this->SetCompression(true);
        // set default PDF version number
        $this->PDFVersion = '1.7';
        $this->encoding = $encoding;
        $this->HREF = array();
        $this->getFontsList();
        $this->fgcolor = array('R' => 0, 'G' => 0, 'B' => 0);
        $this->strokecolor = array('R' => 0, 'G' => 0, 'B' => 0);
        $this->bgcolor = array('R' => 255, 'G' => 255, 'B' => 255);
        $this->extgstates = array();
        // user's rights
        $this->sign = false;
        $this->ur['enabled'] = false;
        $this->ur['document'] = '/FullSave';
        $this->ur['annots'] = '/Create/Delete/Modify/Copy/Import/Export';
        $this->ur['form'] = '…

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