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[openemr.git] / vendor / mpdf / mpdf / src / TTFontFile.php

<?php

namespace Mpdf;

use Mpdf\Fonts\FontCache;
use Mpdf\Fonts\GlyphOperator;

// NOTE*** If you change the defined constants below, be sure to delete all temporary font data files in /ttfontdata/
// to force mPDF to regenerate cached font files.
if (!defined('_OTL_OLD_SPEC_COMPAT_2')) {
        define("_OTL_OLD_SPEC_COMPAT_2", true);
}

// Define the value used in the "head" table of a created TTF file
// 0x74727565 "true" for Mac
// 0x00010000 for Windows
// Either seems to work for a font embedded in a PDF file
// when read by Adobe Reader on a Windows PC(!)
if (!defined('_TTF_MAC_HEADER')) {
        define("_TTF_MAC_HEADER", false);
}

// Recalculate correct metadata/profiles when making subset fonts (not SIP/SMP)
// e.g. xMin, xMax, maxNContours
if (!defined('_RECALC_PROFILE')) {
        define("_RECALC_PROFILE", false);
}

// mPDF 5.7.1
if (!function_exists('\Mpdf\unicode_hex')) {
        function unicode_hex($unicode_dec)
        {
                return (sprintf("%05s", strtoupper(dechex($unicode_dec))));
        }
}

/**
 * TTFontFile class
 *
 * This class is based on The ReportLab Open Source PDF library
 * written in Python - http://www.reportlab.com/software/opensource/
 * together with ideas from the OpenOffice source code and others.
 * This header must be retained in any redistribution or
 * modification of the file.
 *
 * @author Ian Back <ianb@bpm1.com>
 * @license LGPL
 */
class TTFontFile
{

        private $fontCache;

        private $fontDescriptor;

        var $GPOSFeatures; // mPDF 5.7.1

        var $GPOSLookups; // mPDF 5.7.1

        var $GPOSScriptLang; // mPDF 5.7.1

        var $MarkAttachmentType; // mPDF 5.7.1

        var $MarkGlyphSets; // mPDF 7.5.1

        var $GlyphClassMarks; // mPDF 5.7.1

        var $GlyphClassLigatures; // mPDF 5.7.1

        var $GlyphClassBases; // mPDF 5.7.1

        var $GlyphClassComponents; // mPDF 5.7.1

        var $GSUBScriptLang; // mPDF 5.7.1

        var $rtlPUAstr; // mPDF 5.7.1

        //var $rtlPUAarr;       // mPDF 5.7.1
        var $fontkey; // mPDF 5.7.1

        var $useOTL; // mPDF 5.7.1      var $panose;

        var $maxUni;

        var $sFamilyClass;

        var $sFamilySubClass;

        var $sipset;

        var $smpset;

        var $_pos;

        var $numTables;

        var $searchRange;

        var $entrySelector;

        var $rangeShift;

        var $tables;

        var $otables;

        var $filename;

        var $fh;

        var $glyphPos;

        var $charToGlyph;

        var $ascent;

        var $descent;

        var $lineGap; // mPDF 6

        var $hheaascent;

        var $hheadescent;

        var $hhealineGap; // mPDF 6

        var $advanceWidthMax; // mPDF 6

        var $typoAscender; // mPDF 6

        var $typoDescender; // mPDF 6

        var $typoLineGap; // mPDF 6

        var $usWinAscent; // mPDF 6

        var $usWinDescent; // mPDF 6

        var $strikeoutSize;

        var $strikeoutPosition;

        var $name;

        var $familyName;

        var $styleName;

        var $fullName;

        var $uniqueFontID;

        var $unitsPerEm;

        var $bbox;

        var $capHeight;

        var $xHeight; // mPDF 6

        var $stemV;

        var $italicAngle;

        var $flags;

        var $underlinePosition;

        var $underlineThickness;

        var $charWidths;

        var $defaultWidth;

        var $maxStrLenRead;

        var $numTTCFonts;

        var $TTCFonts;

        var $maxUniChar;

        var $kerninfo;

        var $haskernGPOS;

        var $hassmallcapsGSUB;

        var $codeToGlyph;

        var $glyphdata;

        var $LuCoverage;

        public $panose;

        public $version;

        public $fontRevision;

        public $restrictedUse;

        public $glyphIDtoUni;

        public $glyphToChar;

        public $GSUBFeatures;

        public $GSUBLookups;

        public $GSLuCoverage;

        public function __construct(FontCache $fontCache, $fontDescriptor)
        {
                $this->fontCache = $fontCache;
                $this->fontDescriptor = $fontDescriptor;

                // Maximum size of glyf table to read in as string (otherwise reads each glyph from file)
                $this->maxStrLenRead = 200000;
        }

        function getMetrics($file, $fontkey, $TTCfontID = 0, $debug = false, $BMPonly = false, $useOTL = 0)
        {
                $this->useOTL = $useOTL; // mPDF 5.7.1
                $this->fontkey = $fontkey; // mPDF 5.7.1
                $this->filename = $file;
                $this->fh = fopen($file, 'rb');

                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('Can\'t open file ' . $file);
                }

                $this->_pos = 0;
                $this->charWidths = '';
                $this->glyphPos = [];
                $this->charToGlyph = [];
                $this->tables = [];
                $this->otables = [];
                $this->kerninfo = [];
                $this->haskernGPOS = [];
                $this->hassmallcapsGSUB = [];
                $this->ascent = 0;
                $this->descent = 0;
                $this->lineGap = 0; // mPDF 6
                $this->hheaascent = 0; // mPDF 6
                $this->hheadescent = 0; // mPDF 6
                $this->hhealineGap = 0; // mPDF 6
                $this->xHeight = 0; // mPDF 6
                $this->capHeight = 0; // mPDF 6
                $this->panose = [];
                $this->sFamilyClass = 0;
                $this->sFamilySubClass = 0;
                $this->typoAscender = 0; // mPDF 6
                $this->typoDescender = 0; // mPDF 6
                $this->typoLineGap = 0; // mPDF 6
                $this->usWinAscent = 0; // mPDF 6
                $this->usWinDescent = 0; // mPDF 6
                $this->advanceWidthMax = 0; // mPDF 6
                $this->strikeoutSize = 0;
                $this->strikeoutPosition = 0;
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->version = $version = $this->read_ulong();
                $this->panose = [];

                if ($version == 0x4F54544F) {
                        throw new \Mpdf\MpdfException("Postscript outlines are not supported");
                }

                if ($version == 0x74746366 && !$TTCfontID) {
                        throw new \Mpdf\MpdfException("ERROR - You must define the TTCfontID for a TrueType Collection in config_fonts.php (" . $file . ")");
                }

                if (!in_array($version, [0x00010000, 0x74727565]) && !$TTCfontID) {
                        throw new \Mpdf\MpdfException("Not a TrueType font: version=" . $version);
                }

                if ($TTCfontID > 0) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                        $this->numTTCFonts = $this->read_ulong();
                        for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                                $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                        }
                        $this->seek($this->TTCFonts[$TTCfontID]['offset']);
                        $this->version = $version = $this->read_ulong(); // TTFont version again now
                }

                $this->readTableDirectory($debug);
                $this->extractInfo($debug, $BMPonly, $useOTL);
                fclose($this->fh);
        }

        function readTableDirectory($debug = false)
        {
                $this->numTables = $this->read_ushort();
                $this->searchRange = $this->read_ushort();
                $this->entrySelector = $this->read_ushort();
                $this->rangeShift = $this->read_ushort();
                $this->tables = [];
                for ($i = 0; $i < $this->numTables; $i++) {
                        $record = [];
                        $record['tag'] = $this->read_tag();
                        $record['checksum'] = [$this->read_ushort(), $this->read_ushort()];
                        $record['offset'] = $this->read_ulong();
                        $record['length'] = $this->read_ulong();
                        $this->tables[$record['tag']] = $record;
                }
                if ($debug) {
                        $this->checksumTables();
                }
        }

        function checksumTables()
        {
                // Check the checksums for all tables
                foreach ($this->tables as $t) {
                        if ($t['length'] > 0 && $t['length'] < $this->maxStrLenRead) { // 1.02
                                $table = $this->get_chunk($t['offset'], $t['length']);
                                $checksum = $this->calcChecksum($table);
                                if ($t['tag'] == 'head') {
                                        $up = unpack('n*', substr($table, 8, 4));
                                        $adjustment[0] = $up[1];
                                        $adjustment[1] = $up[2];
                                        $checksum = $this->sub32($checksum, $adjustment);
                                }
                                $xchecksum = $t['checksum'];
                                if ($xchecksum != $checksum) {
                                        throw new \Mpdf\MpdfException(sprintf('TTF file "%s": invalid checksum %s table: %s (expected %s)', $this->filename, dechex($checksum[0]) . dechex($checksum[1]), $t['tag'], dechex($xchecksum[0]) . dechex($xchecksum[1])));
                                }
                        }
                }
        }

        function sub32($x, $y)
        {
                $xlo = $x[1];
                $xhi = $x[0];
                $ylo = $y[1];
                $yhi = $y[0];
                if ($ylo > $xlo) {
                        $xlo += 1 << 16;
                        $yhi += 1;
                }
                $reslo = $xlo - $ylo;
                if ($yhi > $xhi) {
                        $xhi += 1 << 16;
                }
                $reshi = $xhi - $yhi;
                $reshi = $reshi & 0xFFFF;

                return [$reshi, $reslo];
        }

        function calcChecksum($data)
        {
                if (strlen($data) % 4) {
                        $data .= str_repeat("\0", (4 - (strlen($data) % 4)));
                }
                $len = strlen($data);
                $hi = 0x0000;
                $lo = 0x0000;
                for ($i = 0; $i < $len; $i += 4) {
                        $hi += (ord($data[$i]) << 8) + ord($data[$i + 1]);
                        $lo += (ord($data[$i + 2]) << 8) + ord($data[$i + 3]);
                        $hi += ($lo >> 16) & 0xFFFF;
                        $lo = $lo & 0xFFFF;
                }
                $hi = $hi & 0xFFFF; // mPDF 5.7.1
                return [$hi, $lo];
        }

        function get_table_pos($tag)
        {
                if (!isset($this->tables[$tag])) {
                        return [0, 0];
                }
                $offset = $this->tables[$tag]['offset'];
                $length = $this->tables[$tag]['length'];

                return [$offset, $length];
        }

        function seek($pos)
        {
                $this->_pos = $pos;
                fseek($this->fh, $this->_pos);
        }

        function skip($delta)
        {
                $this->_pos = $this->_pos + $delta;
                fseek($this->fh, $delta, SEEK_CUR);
        }

        function seek_table($tag, $offset_in_table = 0)
        {
                $tpos = $this->get_table_pos($tag);
                $this->_pos = $tpos[0] + $offset_in_table;
                fseek($this->fh, $this->_pos);

                return $this->_pos;
        }

        function read_tag()
        {
                $this->_pos += 4;

                return fread($this->fh, 4);
        }

        function read_short()
        {
                $this->_pos += 2;
                $s = fread($this->fh, 2);
                $a = (ord($s[0]) << 8) + ord($s[1]);
                if ($a & (1 << 15)) {
                        $a = ($a - (1 << 16));
                }

                return $a;
        }

        function unpack_short($s)
        {
                $a = (ord($s[0]) << 8) + ord($s[1]);
                if ($a & (1 << 15)) {
                        $a = ($a - (1 << 16));
                }

                return $a;
        }

        function read_ushort()
        {
                $this->_pos += 2;
                $s = fread($this->fh, 2);

                return (ord($s[0]) << 8) + ord($s[1]);
        }

        function read_ulong()
        {
                $this->_pos += 4;
                $s = fread($this->fh, 4);

                // if large uInt32 as an integer, PHP converts it to -ve
                return (ord($s[0]) * 16777216) + (ord($s[1]) << 16) + (ord($s[2]) << 8) + ord($s[3]); //        16777216  = 1<<24
        }

        function get_ushort($pos)
        {
                fseek($this->fh, $pos);
                $s = fread($this->fh, 2);

                return (ord($s[0]) << 8) + ord($s[1]);
        }

        function get_ulong($pos)
        {
                fseek($this->fh, $pos);
                $s = fread($this->fh, 4);

                // iF large uInt32 as an integer, PHP converts it to -ve
                return (ord($s[0]) * 16777216) + (ord($s[1]) << 16) + (ord($s[2]) << 8) + ord($s[3]); //        16777216  = 1<<24
        }

        function pack_short($val)
        {
                if ($val < 0) {
                        $val = abs($val);
                        $val = ~$val;
                        $val += 1;
                }

                return pack("n", $val);
        }

        function splice($stream, $offset, $value)
        {
                return substr($stream, 0, $offset) . $value . substr($stream, $offset + strlen($value));
        }

        function _set_ushort($stream, $offset, $value)
        {
                $up = pack("n", $value);

                return $this->splice($stream, $offset, $up);
        }

        function _set_short($stream, $offset, $val)
        {
                if ($val < 0) {
                        $val = abs($val);
                        $val = ~$val;
                        $val += 1;
                }
                $up = pack("n", $val);

                return $this->splice($stream, $offset, $up);
        }

        function get_chunk($pos, $length)
        {
                fseek($this->fh, $pos);
                if ($length < 1) {
                        return '';
                }

                return (fread($this->fh, $length));
        }

        function get_table($tag)
        {
                list($pos, $length) = $this->get_table_pos($tag);
                if ($length == 0) {
                        return '';
                }
                fseek($this->fh, $pos);

                return (fread($this->fh, $length));
        }

        function add($tag, $data)
        {
                if ($tag == 'head') {
                        $data = $this->splice($data, 8, "\0\0\0\0");
                }
                $this->otables[$tag] = $data;
        }

        /////////////////////////////////////////////////////////////////////////////////////////
        function getCTG($file, $TTCfontID = 0, $debug = false, $useOTL = false)
        {
        // mPDF 5.7.1
                // Only called if font is not to be used as embedded subset i.e. NOT called for SIP/SMP fonts
                $this->useOTL = $useOTL; // mPDF 5.7.1
                $this->filename = $file;
                $this->fh = fopen($file, 'rb');

                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('Can\'t open file ' . $file);
                }

                $this->_pos = 0;
                $this->charWidths = '';
                $this->glyphPos = [];
                $this->charToGlyph = [];
                $this->tables = [];
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->skip(4);
                if ($TTCfontID > 0) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                        $this->numTTCFonts = $this->read_ulong();
                        for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                                $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                        }
                        $this->seek($this->TTCFonts[$TTCfontID]['offset']);
                        $this->version = $version = $this->read_ulong(); // TTFont version again now
                }
                $this->readTableDirectory($debug);

                // cmap - Character to glyph index mapping table
                $cmap_offset = $this->seek_table("cmap");
                $this->skip(2);
                $cmapTableCount = $this->read_ushort();
                $unicode_cmap_offset = 0;
                for ($i = 0; $i < $cmapTableCount; $i++) {
                        $platformID = $this->read_ushort();
                        $encodingID = $this->read_ushort();
                        $offset = $this->read_ulong();
                        $save_pos = $this->_pos;
                        if ($platformID == 3 && $encodingID == 1) { // Microsoft, Unicode
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 4) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                        break;
                                }
                        } else if ($platformID == 0) { // Unicode -- assume all encodings are compatible
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 4) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                        break;
                                }
                        }
                        $this->seek($save_pos);
                }

                $glyphToChar = [];
                $charToGlyph = [];
                $this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph);

                ///////////////////////////////////
                // mPDF 5.7.1
                // Map Unmapped glyphs - from $numGlyphs
                if ($useOTL) {
                        $this->seek_table("maxp");
                        $this->skip(4);
                        $numGlyphs = $this->read_ushort();
                        $bctr = 0xE000;
                        for ($gid = 1; $gid < $numGlyphs; $gid++) {
                                if (!isset($glyphToChar[$gid])) {
                                        while (isset($charToGlyph[$bctr])) {
                                                $bctr++;
                                        } // Avoid overwriting a glyph already mapped in PUA
                                        if ($bctr > 0xF8FF) {
                                                throw new \Mpdf\MpdfException($file . " : WARNING - Font cannot map all included glyphs into Private Use Area U+E000 - U+F8FF; cannot use useOTL on this font");
                                        }
                                        $glyphToChar[$gid][] = $bctr;
                                        $charToGlyph[$bctr] = $gid;
                                        $bctr++;
                                }
                        }
                }
                ///////////////////////////////////

                fclose($this->fh);

                return ($charToGlyph);
        }

        /////////////////////////////////////////////////////////////////////////////////////////
        function getTTCFonts($file)
        {
                $this->filename = $file;
                $this->fh = fopen($file, 'rb');
                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('ERROR - Can\'t open file ' . $file);
                }
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->version = $version = $this->read_ulong();
                if ($version == 0x74746366) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                } else {
                        throw new \Mpdf\MpdfException("ERROR - Not a TrueType Collection: version=" . $version . " - " . $file);
                }
                $this->numTTCFonts = $this->read_ulong();
                for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                        $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                }
        }

        /////////////////////////////////////////////////////////////////////////////////////////
        /////////////////////////////////////////////////////////////////////////////////////////

        function extractInfo($debug = false, $BMPonly = false, $useOTL = 0)
        {
                // Values are all set to 0 or blank at start of getMetrics
                ///////////////////////////////////
                // name - Naming table
                ///////////////////////////////////
                $name_offset = $this->seek_table("name");
                $format = $this->read_ushort();
                if ($format != 0 && $format != 1) {
                        throw new \Mpdf\MpdfException("Unknown name table format " . $format);
                }
                $numRecords = $this->read_ushort();
                $string_data_offset = $name_offset + $this->read_ushort();
                $names = [1 => '', 2 => '', 3 => '', 4 => '', 6 => ''];
                $K = array_keys($names);
                $nameCount = count($names);
                for ($i = 0; $i < $numRecords; $i++) {
                        $platformId = $this->read_ushort();
                        $encodingId = $this->read_ushort();
                        $languageId = $this->read_ushort();
                        $nameId = $this->read_ushort();
                        $length = $this->read_ushort();
                        $offset = $this->read_ushort();
                        if (!in_array($nameId, $K)) {
                                continue;
                        }
                        $N = '';
                        if ($platformId == 3 && $encodingId == 1 && $languageId == 0x409) { // Microsoft, Unicode, US English, PS Name
                                $opos = $this->_pos;
                                $this->seek($string_data_offset + $offset);
                                if ($length % 2 != 0) {
                                        throw new \Mpdf\MpdfException("PostScript name is UTF-16BE string of odd length");
                                }
                                $length /= 2;
                                $N = '';
                                while ($length > 0) {
                                        $char = $this->read_ushort();
                                        $N .= (chr($char));
                                        $length -= 1;
                                }
                                $this->_pos = $opos;
                                $this->seek($opos);
                        } else if ($platformId == 1 && $encodingId == 0 && $languageId == 0) { // Macintosh, Roman, English, PS Name
                                $opos = $this->_pos;
                                $N = $this->get_chunk($string_data_offset + $offset, $length);
                                $this->_pos = $opos;
                                $this->seek($opos);
                        }
                        if ($N && $names[$nameId] == '') {
                                $names[$nameId] = $N;
                                $nameCount -= 1;
                                if ($nameCount == 0) {
                                        break;
                                }
                        }
                }
                if ($names[6]) {
                        $psName = $names[6];
                } else if ($names[4]) {
                        $psName = preg_replace('/ /', '-', $names[4]);
                } else if ($names[1]) {
                        $psName = preg_replace('/ /', '-', $names[1]);
                } else {
                        $psName = '';
                }
                if (!$psName) {
                        throw new \Mpdf\MpdfException("Could not find PostScript font name: " . $this->filename);
                }
                // CHECK IF psName valid (PadaukBook contains illegal characters in Name ID 6 i.e. Postscript Name)
                $psNameInvalid = false;
                for ($i = 0; $i < strlen($psName); $i++) {
                        $c = $psName[$i];
                        $oc = ord($c);
                        if ($oc > 126 || strpos(' [](){}<>/%', $c) !== false) {
                                //throw new \Mpdf\MpdfException("psName=".$psName." contains invalid character ".$c." ie U+".ord(c));
                                $psNameInvalid = true;
                                break;
                        }
                }

                if ($psNameInvalid && $names[4]) {
                        $psName = preg_replace('/ /', '-', $names[4]);
                }

                $this->name = $psName;
                if ($names[1]) {
                        $this->familyName = $names[1];
                } else {
                        $this->familyName = $psName;
                }
                if ($names[2]) {
                        $this->styleName = $names[2];
                } else {
                        $this->styleName = 'Regular';
                }
                if ($names[4]) {
                        $this->fullName = $names[4];
                } else {
                        $this->fullName = $psName;
                }
                if ($names[3]) {
                        $this->uniqueFontID = $names[3];
                } else {
                        $this->uniqueFontID = $psName;
                }

                if (!$psNameInvalid && $names[6]) {
                        $this->fullName = $names[6];
                }

                ///////////////////////////////////
                // head - Font header table
                ///////////////////////////////////
                $this->seek_table("head");
                if ($debug) {
                        $ver_maj = $this->read_ushort();
                        $ver_min = $this->read_ushort();
                        if ($ver_maj != 1) {
                                throw new \Mpdf\MpdfException('Unknown head table version ' . $ver_maj . '.' . $ver_min);
                        }
                        $this->fontRevision = $this->read_ushort() . $this->read_ushort();

                        $this->skip(4);
                        $magic = $this->read_ulong();
                        if ($magic != 0x5F0F3CF5) {
                                throw new \Mpdf\MpdfException('Invalid head table magic ' . $magic);
                        }
                        $this->skip(2);
                } else {
                        $this->skip(18);
                }
                $this->unitsPerEm = $unitsPerEm = $this->read_ushort();
                $scale = 1000 / $unitsPerEm;
                $this->skip(16);
                $xMin = $this->read_short();
                $yMin = $this->read_short();
                $xMax = $this->read_short();
                $yMax = $this->read_short();
                $this->bbox = [($xMin * $scale), ($yMin * $scale), ($xMax * $scale), ($yMax * $scale)];

                $this->skip(3 * 2);
                $indexToLocFormat = $this->read_ushort();
                $glyphDataFormat = $this->read_ushort();
                if ($glyphDataFormat != 0) {
                        throw new \Mpdf\MpdfException('Unknown glyph data format ' . $glyphDataFormat);
                }

                ///////////////////////////////////
                // hhea metrics table
                ///////////////////////////////////
                if (isset($this->tables["hhea"])) {
                        $this->seek_table("hhea");
                        $this->skip(4);
                        $hheaAscender = $this->read_short();
                        $hheaDescender = $this->read_short();
                        $hheaLineGap = $this->read_short(); // mPDF 6
                        $hheaAdvanceWidthMax = $this->read_ushort(); // mPDF 6
                        $this->hheaascent = ($hheaAscender * $scale);
                        $this->hheadescent = ($hheaDescender * $scale);
                        $this->hhealineGap = ($hheaLineGap * $scale); // mPDF 6
                        $this->advanceWidthMax = ($hheaAdvanceWidthMax * $scale); // mPDF 6
                }

                ///////////////////////////////////
                // OS/2 - OS/2 and Windows metrics table
                ///////////////////////////////////
                $use_typo_metrics = false;
                if (isset($this->tables["OS/2"])) {
                        $this->seek_table("OS/2");
                        $version = $this->read_ushort();
                        $this->skip(2);
                        $usWeightClass = $this->read_ushort();
                        $this->skip(2);
                        $fsType = $this->read_ushort();
                        if ($fsType == 0x0002 || ($fsType & 0x0300) != 0) {
                                $this->restrictedUse = true;
                        }

                        // mPDF 6
                        $this->skip(16);
                        $yStrikeoutSize = $this->read_short();
                        $yStrikeoutPosition = $this->read_short();
                        $this->strikeoutSize = ($yStrikeoutSize * $scale);
                        $this->strikeoutPosition = ($yStrikeoutPosition * $scale);

                        $sF = $this->read_short();
                        $this->sFamilyClass = ($sF >> 8);
                        $this->sFamilySubClass = ($sF & 0xFF);
                        $this->_pos += 10; //PANOSE = 10 byte length
                        $panose = fread($this->fh, 10);
                        $this->panose = [];
                        for ($p = 0; $p < strlen($panose); $p++) {
                                $this->panose[] = ord($panose[$p]);
                        }
                        //$this->skip(26);
                        // mPDF 6
                        $this->skip(20);
                        $fsSelection = $this->read_ushort();
                        $use_typo_metrics = (($fsSelection & 0x80) == 0x80); // bit#7 = USE_TYPO_METRICS
                        $this->skip(4);

                        $sTypoAscender = $this->read_short();
                        $sTypoDescender = $this->read_short();
                        $sTypoLineGap = $this->read_short(); // mPDF 6
                        if ($sTypoAscender) {
                                $this->typoAscender = ($sTypoAscender * $scale);
                        } // mPDF 6
                        if ($sTypoDescender) {
                                $this->typoDescender = ($sTypoDescender * $scale);
                        } // mPDF 6
                        if ($sTypoLineGap) {
                                $this->typoLineGap = ($sTypoLineGap * $scale);
                        } // mPDF 6

                        $usWinAscent = $this->read_ushort(); // mPDF 6
                        $usWinDescent = $this->read_ushort(); // mPDF 6
                        if ($usWinAscent) {
                                $this->usWinAscent = ($usWinAscent * $scale);
                        } // mPDF 6
                        if ($usWinDescent) {
                                $this->usWinDescent = ($usWinDescent * $scale);
                        } // mPDF 6

                        if ($version > 1) {
                                $this->skip(8); // mPDF 6
                                $sxHeight = $this->read_short();
                                $this->xHeight = ($sxHeight * $scale);
                                $sCapHeight = $this->read_short();
                                $this->capHeight = ($sCapHeight * $scale);
                        }
                } else {
                        $usWeightClass = 400;
                }
                $this->stemV = 50 + intval(pow(($usWeightClass / 65.0), 2));

                // FONT DESCRIPTOR METRICS
                if ($this->fontDescriptor == 'winTypo') {
                        $this->ascent = $this->typoAscender;
                        $this->descent = $this->typoDescender;
                        $this->lineGap = $this->typoLineGap;
                } else if ($this->fontDescriptor == 'mac') {
                        $this->ascent = $this->hheaascent;
                        $this->descent = $this->hheadescent;
                        $this->lineGap = $this->hhealineGap;
                } else { // if (_FONT_DESCRIPTOR == 'win') {    // default
                        $this->ascent = $this->usWinAscent;
                        $this->descent = -$this->usWinDescent;
                        $this->lineGap = 0;

                        /* Special case - if either the winAscent or winDescent are greater than the
                          font bounding box yMin yMax, then reduce them accordingly.
                          This works with Myanmar Text (Windows 8 version) to give a
                          line-height normal that is equivalent to that produced in browsers.
                          Also Khmer OS = compatible with MSWord, Wordpad and browser. */
                        if ($this->ascent > $this->bbox[3]) {
                                $this->ascent = $this->bbox[3];
                        }
                        if ($this->descent < $this->bbox[1]) {
                                $this->descent = $this->bbox[1];
                        }

                        /* Override case - if the USE_TYPO_METRICS bit is set on OS/2 fsSelection
                          this is telling the font to use the sTypo values and not the usWinAscent values.
                          This works as a fix with Cambria Math to give a normal line-height;
                          at present, this is the only font I have found with this bit set;
                          although note that MS WordPad and windows FF browser uses the big line-height from winAscent
                          but Word 2007 get it right . */
                        if ($use_typo_metrics && $this->typoAscender) {
                                $this->ascent = $this->typoAscender;
                                $this->descent = $this->typoDescender;
                                $this->lineGap = $this->typoLineGap;
                        }
                }

                ///////////////////////////////////
                // post - PostScript table
                ///////////////////////////////////
                $this->seek_table("post");
                if ($debug) {
                        $ver_maj = $this->read_ushort();
                        if ($ver_maj < 1 || $ver_maj > 4) {
                                throw new \Mpdf\MpdfException('Unknown post table version ' . $ver_maj);
                        }
                } else {
                        $this->skip(4);
                }
                $this->italicAngle = $this->read_short() + $this->read_ushort() / 65536.0;
                $this->underlinePosition = $this->read_short() * $scale;
                $this->underlineThickness = $this->read_short() * $scale;
                $isFixedPitch = $this->read_ulong();

                $this->flags = 4;

                if ($this->italicAngle != 0) {
                        $this->flags = $this->flags | 64;
                }
                if ($usWeightClass >= 600) {
                        $this->flags = $this->flags | 262144;
                }
                if ($isFixedPitch) {
                        $this->flags = $this->flags | 1;
                }

                ///////////////////////////////////
                // hhea - Horizontal header table
                ///////////////////////////////////
                $this->seek_table("hhea");
                if ($debug) {
                        $ver_maj = $this->read_ushort();
                        if ($ver_maj != 1) {
                                throw new \Mpdf\MpdfException('Unknown hhea table version ' . $ver_maj);
                        }
                        $this->skip(28);
                } else {
                        $this->skip(32);
                }

                $metricDataFormat = $this->read_ushort();

                if ($metricDataFormat != 0) {
                        throw new \Mpdf\MpdfException('Unknown horizontal metric data format ' . $metricDataFormat);
                }

                $numberOfHMetrics = $this->read_ushort();

                if ($numberOfHMetrics == 0) {
                        throw new \Mpdf\MpdfException('Number of horizontal metrics is 0');
                }

                ///////////////////////////////////
                // maxp - Maximum profile table
                ///////////////////////////////////
                $this->seek_table("maxp");
                if ($debug) {
                        $ver_maj = $this->read_ushort();
                        if ($ver_maj != 1) {
                                throw new \Mpdf\MpdfException('Unknown maxp table version ' . $ver_maj);
                        }
                } else {
                        $this->skip(4);
                }
                $numGlyphs = $this->read_ushort();

                ///////////////////////////////////
                // cmap - Character to glyph index mapping table
                ///////////////////////////////////
                $cmap_offset = $this->seek_table("cmap");
                $this->skip(2);
                $cmapTableCount = $this->read_ushort();
                $unicode_cmap_offset = 0;
                for ($i = 0; $i < $cmapTableCount; $i++) {
                        $platformID = $this->read_ushort();
                        $encodingID = $this->read_ushort();
                        $offset = $this->read_ulong();
                        $save_pos = $this->_pos;
                        if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 4) {
                                        if (!$unicode_cmap_offset) {
                                                $unicode_cmap_offset = $cmap_offset + $offset;
                                        }
                                        if ($BMPonly) {
                                                break;
                                        }
                                }
                        } // Microsoft, Unicode Format 12 table HKCS
                        else if ((($platformID == 3 && $encodingID == 10) || $platformID == 0) && !$BMPonly) {
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 12) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                        break;
                                }
                        }
                        $this->seek($save_pos);
                }

                if (!$unicode_cmap_offset) {
                        throw new \Mpdf\MpdfException('Font (' . $this->filename . ') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 0, any encoding, format 4)');
                }

                $sipset = false;
                $smpset = false;

                // mPDF 5.7.1
                $this->rtlPUAstr = '';
                //$this->rtlPUAarr = array();
                $this->GSUBScriptLang = [];
                $this->GSUBFeatures = [];
                $this->GSUBLookups = [];
                $this->GPOSScriptLang = [];
                $this->GPOSFeatures = [];
                $this->GPOSLookups = [];
                $this->glyphIDtoUni = '';

                // Format 12 CMAP does characters above Unicode BMP i.e. some HKCS characters U+20000 and above
                if ($format == 12 && !$BMPonly) {
                        $this->maxUniChar = 0;
                        $this->seek($unicode_cmap_offset + 4);
                        $length = $this->read_ulong();
                        $limit = $unicode_cmap_offset + $length;
                        $this->skip(4);

                        $nGroups = $this->read_ulong();

                        $glyphToChar = [];
                        $charToGlyph = [];
                        for ($i = 0; $i < $nGroups; $i++) {
                                $startCharCode = $this->read_ulong();
                                $endCharCode = $this->read_ulong();
                                $startGlyphCode = $this->read_ulong();
                                // ZZZ98
                                if ($endCharCode > 0x20000 && $endCharCode < 0x2FFFF) {
                                        $sipset = true;
                                } else if ($endCharCode > 0x10000 && $endCharCode < 0x1FFFF) {
                                        $smpset = true;
                                }
                                $offset = 0;
                                for ($unichar = $startCharCode; $unichar <= $endCharCode; $unichar++) {
                                        $glyph = $startGlyphCode + $offset;
                                        $offset++;
                                        // ZZZ98
                                        if ($unichar < 0x30000) {
                                                $charToGlyph[$unichar] = $glyph;
                                                $this->maxUniChar = max($unichar, $this->maxUniChar);
                                                $glyphToChar[$glyph][] = $unichar;
                                        }
                                }
                        }
                } else {
                        $glyphToChar = [];
                        $charToGlyph = [];
                        $this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph);
                }
                $this->sipset = $sipset;
                $this->smpset = $smpset;

                ///////////////////////////////////
                // mPDF 5.7.1
                // Map Unmapped glyphs (or glyphs mapped to upper PUA U+F00000 onwards i.e. > U+2FFFF) - from $numGlyphs
                if ($this->useOTL) {
                        $bctr = 0xE000;
                        for ($gid = 1; $gid < $numGlyphs; $gid++) {
                                if (!isset($glyphToChar[$gid])) {
                                        while (isset($charToGlyph[$bctr])) {
                                                $bctr++;
                                        } // Avoid overwriting a glyph already mapped in PUA
                                        // ZZZ98
                                        if (($bctr > 0xF8FF) && ($bctr < 0x2CEB0)) {
                                                if (!$BMPonly) {
                                                        $bctr = 0x2CEB0; // Use unassigned area 0x2CEB0 to 0x2F7FF (space for 10,000 characters)
                                                        $this->sipset = $sipset = true; // forces subsetting; also ensure charwidths are saved
                                                        while (isset($charToGlyph[$bctr])) {
                                                                $bctr++;
                                                        }
                                                } else {
                                                        throw new \Mpdf\MpdfException($names[1] . " : WARNING - The font does not have enough space to map all (unmapped) included glyphs into Private Use Area U+E000 - U+F8FF");
                                                }
                                        }
                                        $glyphToChar[$gid][] = $bctr;
                                        $charToGlyph[$bctr] = $gid;
                                        $this->maxUniChar = max($bctr, $this->maxUniChar);
                                        $bctr++;
                                }
                        }
                }

                $this->glyphToChar = $glyphToChar;
                ///////////////////////////////////
                // mPDF 5.7.1   OpenType Layout tables
                $this->GSUBScriptLang = [];
                $this->rtlPUAstr = '';
                //$this->rtlPUAarr = array();
                if ($useOTL) {
                        $this->_getGDEFtables();
                        list($this->GSUBScriptLang, $this->GSUBFeatures, $this->GSUBLookups, $this->rtlPUAstr) = $this->_getGSUBtables();
                        // , $this->rtlPUAarr not needed
                        list($this->GPOSScriptLang, $this->GPOSFeatures, $this->GPOSLookups) = $this->_getGPOStables();
                        $this->glyphIDtoUni = str_pad('', 256 * 256 * 3, "\x00");
                        foreach ($glyphToChar as $gid => $arr) {
                                if (isset($glyphToChar[$gid][0])) {
                                        $char = $glyphToChar[$gid][0];

                                        if ($char != 0 && $char != 65535) {
                                                $this->glyphIDtoUni[$gid * 3] = chr($char >> 16);
                                                $this->glyphIDtoUni[$gid * 3 + 1] = chr(($char >> 8) & 0xFF);
                                                $this->glyphIDtoUni[$gid * 3 + 2] = chr($char & 0xFF);
                                        }
                                }
                        }
                }
                ///////////////////////////////////
                // if xHeight and/or CapHeight are not available from OS/2 (e.g. eraly versions)
                // Calculate from yMax of 'x' or 'H' Glyphs...
                if ($this->xHeight == 0) {
                        if (isset($charToGlyph[0x78])) {
                                $gidx = $charToGlyph[0x78]; // U+0078 (LATIN SMALL LETTER X)
                                $start = $this->seek_table('loca');
                                if ($indexToLocFormat == 0) {
                                        $this->skip($gidx * 2);
                                        $locax = $this->read_ushort() * 2;
                                } else if ($indexToLocFormat == 1) {
                                        $this->skip($gidx * 4);
                                        $locax = $this->read_ulong();
                                }
                                $start = $this->seek_table('glyf');
                                $this->skip($locax);
                                $this->skip(8);
                                $yMaxx = $this->read_short();
                                $this->xHeight = $yMaxx * $scale;
                        }
                }
                if ($this->capHeight == 0) {
                        if (isset($charToGlyph[0x48])) {
                                $gidH = $charToGlyph[0x48]; // U+0048 (LATIN CAPITAL LETTER H)
                                $start = $this->seek_table('loca');
                                if ($indexToLocFormat == 0) {
                                        $this->skip($gidH * 2);
                                        $locaH = $this->read_ushort() * 2;
                                } else if ($indexToLocFormat == 1) {
                                        $this->skip($gidH * 4);
                                        $locaH = $this->read_ulong();
                                }
                                $start = $this->seek_table('glyf');
                                $this->skip($locaH);
                                $this->skip(8);
                                $yMaxH = $this->read_short();
                                $this->capHeight = $yMaxH * $scale;
                        } else {
                                $this->capHeight = $this->ascent;
                        } // final default is to set it = to Ascent
                }

                ///////////////////////////////////
                // hmtx - Horizontal metrics table
                ///////////////////////////////////
                $this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);

                ///////////////////////////////////
                // kern - Kerning pair table
                ///////////////////////////////////
                // Recognises old form of Kerning table - as required by Windows - Format 0 only
                $kern_offset = $this->seek_table("kern");
                $version = $this->read_ushort();
                $nTables = $this->read_ushort();
                // subtable header
                $sversion = $this->read_ushort();
                $slength = $this->read_ushort();
                $scoverage = $this->read_ushort();
                $format = $scoverage >> 8;
                if ($kern_offset && $version == 0 && $format == 0) {
                        // Format 0
                        $nPairs = $this->read_ushort();
                        $this->skip(6);
                        for ($i = 0; $i < $nPairs; $i++) {
                                $left = $this->read_ushort();
                                $right = $this->read_ushort();
                                $val = $this->read_short();
                                if (isset($glyphToChar[$left]) && count($glyphToChar[$left]) == 1 && isset($glyphToChar[$right]) && count($glyphToChar[$right]) == 1) {
                                        if ($left != 32 && $right != 32) {
                                                $this->kerninfo[$glyphToChar[$left][0]][$glyphToChar[$right][0]] = intval($val * $scale);
                                        }
                                }
                        }
                }
        }

        /////////////////////////////////////////////////////////////////////////////////////////
        function _getGDEFtables()
        {
                ///////////////////////////////////
                // GDEF - Glyph Definition
                ///////////////////////////////////
                // http://www.microsoft.com/typography/otspec/gdef.htm
                if (isset($this->tables["GDEF"])) {
                        $gdef_offset = $this->seek_table("GDEF");
                        // ULONG Version of the GDEF table-currently 0x00010000
                        $ver_maj = $this->read_ushort();
                        $ver_min = $this->read_ushort();
                        $GlyphClassDef_offset = $this->read_ushort();
                        $AttachList_offset = $this->read_ushort();
                        $LigCaretList_offset = $this->read_ushort();
                        $MarkAttachClassDef_offset = $this->read_ushort();
                        // Version 0x00010002 of GDEF header contains additional Offset to a list defining mark glyph set definitions (MarkGlyphSetDef)
                        if ($ver_min == 2) {
                                $MarkGlyphSetsDef_offset = $this->read_ushort();
                        }

                        // GlyphClassDef
                        if ($GlyphClassDef_offset) {
                                $this->seek($gdef_offset + $GlyphClassDef_offset);
                                /*
                                  1     Base glyph (single character, spacing glyph)
                                  2     Ligature glyph (multiple character, spacing glyph)
                                  3     Mark glyph (non-spacing combining glyph)
                                  4     Component glyph (part of single character, spacing glyph)
                                 */
                                $GlyphByClass = $this->_getClassDefinitionTable();
                        } else {
                                $GlyphByClass = [];
                        }

                        if (isset($GlyphByClass[1]) && count($GlyphByClass[1]) > 0) {
                                $this->GlyphClassBases = ' ' . implode('| ', $GlyphByClass[1]);
                        } else {
                                $this->GlyphClassBases = '';
                        }
                        if (isset($GlyphByClass[2]) && count($GlyphByClass[2]) > 0) {
                                $this->GlyphClassLigatures = ' ' . implode('| ', $GlyphByClass[2]);
                        } else {
                                $this->GlyphClassLigatures = '';
                        }
                        if (isset($GlyphByClass[3]) && count($GlyphByClass[3]) > 0) {
                                $this->GlyphClassMarks = ' ' . implode('| ', $GlyphByClass[3]);
                        } else {
                                $this->GlyphClassMarks = '';
                        }
                        if (isset($GlyphByClass[4]) && count($GlyphByClass[4]) > 0) {
                                $this->GlyphClassComponents = ' ' . implode('| ', $GlyphByClass[4]);
                        } else {
                                $this->GlyphClassComponents = '';
                        }

                        if (isset($GlyphByClass[3]) && count($GlyphByClass[3]) > 0) {
                                $Marks = $GlyphByClass[3];
                        } // to use for MarkAttachmentType
                        else {
                                $Marks = [];
                        }

                        /* Required for GPOS
                          // Attachment List
                          if ($AttachList_offset) {
                          $this->seek($gdef_offset+$AttachList_offset );
                          }
                          The Attachment Point List table (AttachmentList) identifies all the attachment points defined in the GPOS table and their associated glyphs so a client can quickly access coordinates for each glyph's attachment points. As a result, the client can cache coordinates for attachment points along with glyph bitmaps and avoid recalculating the attachment points each time it displays a glyph. Without this table, processing speed would be slower because the client would have to decode the GPOS lookups that define attachment points and compile the points in a list.

                          The Attachment List table (AttachList) may be used to cache attachment point coordinates along with glyph bitmaps.

                          The table consists of an offset to a Coverage table (Coverage) listing all glyphs that define attachment points in the GPOS table, a count of the glyphs with attachment points (GlyphCount), and an array of offsets to AttachPoint tables (AttachPoint). The array lists the AttachPoint tables, one for each glyph in the Coverage table, in the same order as the Coverage Index.
                          AttachList table
                          Type  Name    Description
                          Offset        Coverage        Offset to Coverage table - from beginning of AttachList table
                          uint16        GlyphCount      Number of glyphs with attachment points
                          Offset        AttachPoint[GlyphCount]         Array of offsets to AttachPoint tables-from beginning of AttachList table-in Coverage Index order

                          An AttachPoint table consists of a count of the attachment points on a single glyph (PointCount) and an array of contour indices of those points (PointIndex), listed in increasing numerical order.

                          AttachPoint table
                          Type  Name    Description
                          uint16        PointCount      Number of attachment points on this glyph
                          uint16        PointIndex[PointCount]  Array of contour point indices -in increasing numerical order

                          See Example 3 - http://www.microsoft.com/typography/otspec/gdef.htm
                         */

                        // Ligature Caret List
                        // The Ligature Caret List table (LigCaretList) defines caret positions for all the ligatures in a font.
                        // Not required for mDPF
                        // MarkAttachmentType
                        if ($MarkAttachClassDef_offset) {
                                $this->seek($gdef_offset + $MarkAttachClassDef_offset);
                                $MarkAttachmentTypes = $this->_getClassDefinitionTable();
                                foreach ($MarkAttachmentTypes as $class => $glyphs) {
                                        if (is_array($Marks) && count($Marks)) {
                                                $mat = array_diff($Marks, $MarkAttachmentTypes[$class]);
                                                sort($mat, SORT_STRING);
                                        } else {
                                                $mat = [];
                                        }

                                        $this->MarkAttachmentType[$class] = ' ' . implode('| ', $mat);
                                }
                        } else {
                                $this->MarkAttachmentType = [];
                        }

                        // MarkGlyphSets only in Version 0x00010002 of GDEF
                        if ($ver_min == 2 && $MarkGlyphSetsDef_offset) {
                                $this->seek($gdef_offset + $MarkGlyphSetsDef_offset);
                                $MarkSetTableFormat = $this->read_ushort();
                                $MarkSetCount = $this->read_ushort();
                                $MarkSetOffset = [];
                                for ($i = 0; $i < $MarkSetCount; $i++) {
                                        $MarkSetOffset[] = $this->read_ulong();
                                }
                                for ($i = 0; $i < $MarkSetCount; $i++) {
                                        $this->seek($MarkSetOffset[$i]);
                                        $glyphs = $this->_getCoverage();
                                        $this->MarkGlyphSets[$i] = ' ' . implode('| ', $glyphs);
                                }
                        } else {
                                $this->MarkGlyphSets = [];
                        }
                } else {
                        throw new \Mpdf\MpdfException('Warning - You cannot set this font (' . $this->filename . ') to use OTL, as it does not include OTL tables (or at least, not a GDEF table).');
                }

                //=====================================================================================
                //=====================================================================================
                //=====================================================================================
                $GSUB_offset = 0;
                $GPOS_offset = 0;
                $GSUB_length = 0;
                $s = '';
                if (isset($this->tables["GSUB"])) {
                        $GSUB_offset = $this->seek_table("GSUB");
                        $GSUB_length = $this->tables["GSUB"]['length'];
                        $s .= fread($this->fh, $this->tables["GSUB"]['length']);
                }
                if (isset($this->tables["GPOS"])) {
                        $GPOS_offset = $this->seek_table("GPOS");
                        $s .= fread($this->fh, $this->tables["GPOS"]['length']);
                }
                if ($s) {
                        $this->fontCache->write($this->fontkey . '.GSUBGPOStables.dat', $s);
                }

                //=====================================================================================
                //=====================================================================================

                $s = '<?php
$GSUB_offset = ' . $GSUB_offset . ';
$GPOS_offset = ' . $GPOS_offset . ';
$GSUB_length = ' . $GSUB_length . ';
$GlyphClassBases = \'' . $this->GlyphClassBases . '\';
$GlyphClassMarks = \'' . $this->GlyphClassMarks . '\';
$GlyphClassLigatures = \'' . $this->GlyphClassLigatures . '\';
$GlyphClassComponents = \'' . $this->GlyphClassComponents . '\';
$MarkGlyphSets = ' . var_export($this->MarkGlyphSets, true) . ';
$MarkAttachmentType = ' . var_export($this->MarkAttachmentType, true) . ';
';

                $this->fontCache->write($this->fontkey . '.GDEFdata.php', $s);
        }

        function _getClassDefinitionTable()
        {

                // NB Any glyph not included in the range of covered GlyphIDs automatically belongs to Class 0. This is not returned by this function
                $ClassFormat = $this->read_ushort();
                $GlyphByClass = [];
                if ($ClassFormat == 1) {
                        $StartGlyph = $this->read_ushort();
                        $GlyphCount = $this->read_ushort();
                        for ($i = 0; $i < $GlyphCount; $i++) {
                                $gid = $StartGlyph + $i;
                                $class = $this->read_ushort();
                                // Several fonts  (mainly dejavu.../Freeserif etc) have a MarkAttachClassDef Format 1, where StartGlyph is 0 and GlyphCount is 1
                                // This doesn't seem to do anything useful?
                                // Freeserif does not have $this->glyphToChar[0] allocated and would throw an error, so check if isset:
                                if (isset($this->glyphToChar[$gid][0])) {
                                        $GlyphByClass[$class][] = unicode_hex($this->glyphToChar[$gid][0]);
                                }
                        }
                } else if ($ClassFormat == 2) {
                        $tableCount = $this->read_ushort();
                        for ($i = 0; $i < $tableCount; $i++) {
                                $startGlyphID = $this->read_ushort();
                                $endGlyphID = $this->read_ushort();
                                $class = $this->read_ushort();
                                for ($gid = $startGlyphID; $gid <= $endGlyphID; $gid++) {
                                        if (isset($this->glyphToChar[$gid][0])) {
                                                $GlyphByClass[$class][] = unicode_hex($this->glyphToChar[$gid][0]);
                                        }
                                }
                        }
                }
                foreach ($GlyphByClass as $class => $glyphs) {
                        sort($GlyphByClass[$class], SORT_STRING); // SORT makes it easier to read in development ? order not important ???
                }
                ksort($GlyphByClass);

                return $GlyphByClass;
        }

        function _getGSUBtables()
        {
                ///////////////////////////////////
                // GSUB - Glyph Substitution
                ///////////////////////////////////
                if (isset($this->tables["GSUB"])) {
                        $ffeats = [];
                        $gsub_offset = $this->seek_table("GSUB");
                        $this->skip(4);
                        $ScriptList_offset = $gsub_offset + $this->read_ushort();
                        $FeatureList_offset = $gsub_offset + $this->read_ushort();
                        $LookupList_offset = $gsub_offset + $this->read_ushort();

                        // ScriptList
                        $this->seek($ScriptList_offset);
                        $ScriptCount = $this->read_ushort();
                        for ($i = 0; $i < $ScriptCount; $i++) {
                                $ScriptTag = $this->read_tag(); // = "beng", "deva" etc.
                                $ScriptTableOffset = $this->read_ushort();
                                $ffeats[$ScriptTag] = $ScriptList_offset + $ScriptTableOffset;
                        }

                        // Script Table
                        foreach ($ffeats as $t => $o) {
                                $ls = [];
                                $this->seek($o);
                                $DefLangSys_offset = $this->read_ushort();
                                if ($DefLangSys_offset > 0) {
                                        $ls['DFLT'] = $DefLangSys_offset + $o;
                                }
                                $LangSysCount = $this->read_ushort();
                                for ($i = 0; $i < $LangSysCount; $i++) {
                                        $LangTag = $this->read_tag(); // =
                                        $LangTableOffset = $this->read_ushort();
                                        $ls[$LangTag] = $o + $LangTableOffset;
                                }
                                $ffeats[$t] = $ls;
                        }
//print_r($ffeats); exit;
                        // Get FeatureIndexList
                        // LangSys Table - from first listed langsys
                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $o) {
                                        $FeatureIndex = [];
                                        $langsystable_offset = $o;
                                        $this->seek($langsystable_offset);
                                        $LookUpOrder = $this->read_ushort(); //==NULL
                                        $ReqFeatureIndex = $this->read_ushort();
                                        if ($ReqFeatureIndex != 0xFFFF) {
                                                $FeatureIndex[] = $ReqFeatureIndex;
                                        }
                                        $FeatureCount = $this->read_ushort();
                                        for ($i = 0; $i < $FeatureCount; $i++) {
                                                $FeatureIndex[] = $this->read_ushort(); // = index of feature
                                        }
                                        $ffeats[$st][$t] = $FeatureIndex;
                                }
                        }
//print_r($ffeats); exit;
                        // Feauture List => LookupListIndex es
                        $this->seek($FeatureList_offset);
                        $FeatureCount = $this->read_ushort();
                        $Feature = [];
                        for ($i = 0; $i < $FeatureCount; $i++) {
                                $tag = $this->read_tag();
                                if ($tag == 'smcp') {
                                        $this->hassmallcapsGSUB = true;
                                }
                                $Feature[$i] = ['tag' => $tag];
                                $Feature[$i]['offset'] = $FeatureList_offset + $this->read_ushort();
                        }
                        for ($i = 0; $i < $FeatureCount; $i++) {
                                $this->seek($Feature[$i]['offset']);
                                $this->read_ushort(); // null [FeatureParams]
                                $Feature[$i]['LookupCount'] = $Lookupcount = $this->read_ushort();
                                $Feature[$i]['LookupListIndex'] = [];
                                for ($c = 0; $c < $Lookupcount; $c++) {
                                        $Feature[$i]['LookupListIndex'][] = $this->read_ushort();
                                }
                        }

//print_r($Feature); exit;

                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $o) {
                                        $FeatureIndex = $ffeats[$st][$t];
                                        foreach ($FeatureIndex as $k => $fi) {
                                                $ffeats[$st][$t][$k] = $Feature[$fi];
                                        }
                                }
                        }
                        //=====================================================================================
                        $gsub = [];
                        $GSUBScriptLang = [];
                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $langsys) {
                                        $lg = [];
                                        foreach ($langsys as $ft) {
                                                $lg[$ft['LookupListIndex'][0]] = $ft;
                                        }
                                        // list of Lookups in order they need to be run i.e. order listed in Lookup table
                                        ksort($lg);
                                        foreach ($lg as $ft) {
                                                $gsub[$st][$t][$ft['tag']] = $ft['LookupListIndex'];
                                        }
                                        if (!isset($GSUBScriptLang[$st])) {
                                                $GSUBScriptLang[$st] = '';
                                        }
                                        $GSUBScriptLang[$st] .= $t . ' ';
                                }
                        }

//print_r($gsub); exit;
                        //=====================================================================================
                        // Get metadata and offsets for whole Lookup List table
                        $this->seek($LookupList_offset);
                        $LookupCount = $this->read_ushort();
                        $GSLookup = [];
                        $Offsets = [];
                        $SubtableCount = [];
                        for ($i = 0; $i < $LookupCount; $i++) {
                                $Offsets[$i] = $LookupList_offset + $this->read_ushort();
                        }
                        for ($i = 0; $i < $LookupCount; $i++) {
                                $this->seek($Offsets[$i]);
                                $GSLookup[$i]['Type'] = $this->read_ushort();
                                $GSLookup[$i]['Flag'] = $flag = $this->read_ushort();
                                $GSLookup[$i]['SubtableCount'] = $SubtableCount[$i] = $this->read_ushort();
                                for ($c = 0; $c < $SubtableCount[$i]; $c++) {
                                        $GSLookup[$i]['Subtables'][$c] = $Offsets[$i] + $this->read_ushort();
                                }
                                // MarkFilteringSet = Index (base 0) into GDEF mark glyph sets structure
                                if (($flag & 0x0010) == 0x0010) {
                                        $GSLookup[$i]['MarkFilteringSet'] = $this->read_ushort();
                                } else {
                                        $GSLookup[$i]['MarkFilteringSet'] = '';
                                }

                                // Lookup Type 7: Extension
                                if ($GSLookup[$i]['Type'] == 7) {
                                        // Overwrites new offset (32-bit) for each subtable, and a new lookup Type
                                        for ($c = 0; $c < $SubtableCount[$i]; $c++) {
                                                $this->seek($GSLookup[$i]['Subtables'][$c]);
                                                $ExtensionPosFormat = $this->read_ushort();
                                                $type = $this->read_ushort();
                                                $ext_offset = $this->read_ulong();
                                                $GSLookup[$i]['Subtables'][$c] = $GSLookup[$i]['Subtables'][$c] + $ext_offset;
                                        }
                                        $GSLookup[$i]['Type'] = $type;
                                }
                        }

//print_r($GSLookup); exit;
                        //=====================================================================================
                        // Process Whole LookupList - Get LuCoverage = Lookup coverage just for first glyph
                        $this->GSLuCoverage = [];
                        for ($i = 0; $i < $LookupCount; $i++) {
                                for ($c = 0; $c < $GSLookup[$i]['SubtableCount']; $c++) {
                                        $this->seek($GSLookup[$i]['Subtables'][$c]);
                                        $PosFormat = $this->read_ushort();

                                        if ($GSLookup[$i]['Type'] == 5 && $PosFormat == 3) {
                                                $this->skip(4);
                                        } else if ($GSLookup[$i]['Type'] == 6 && $PosFormat == 3) {
                                                $BacktrackGlyphCount = $this->read_ushort();
                                                $this->skip(2 * $BacktrackGlyphCount + 2);
                                        }
                                        // NB Coverage only looks at glyphs for position 1 (i.e. 5.3 and 6.3)   // NEEDS TO READ ALL ********************
                                        $Coverage = $GSLookup[$i]['Subtables'][$c] + $this->read_ushort();
                                        $this->seek($Coverage);
                                        $glyphs = $this->_getCoverage(false, 2);
                                        $this->GSLuCoverage[$i][$c] = $glyphs;
                                }
                        }

                        // $this->GSLuCoverage and $GSLookup

                        $s = '<?php
$GSLuCoverage = ' . var_export($this->GSLuCoverage, true) . ';
';

                        $this->fontCache->write($this->fontkey . '.GSUBdata.php', $s);

                        // Now repeats as original to get Substitution rules

                        // Get metadata and offsets for whole Lookup List table
                        $this->seek($LookupList_offset);
                        $LookupCount = $this->read_ushort();
                        $Lookup = [];

                        for ($i = 0; $i < $LookupCount; $i++) {
                                $Lookup[$i]['offset'] = $LookupList_offset + $this->read_ushort();
                        }

                        for ($i = 0; $i < $LookupCount; $i++) {
                                $this->seek($Lookup[$i]['offset']);
                                $Lookup[$i]['Type'] = $this->read_ushort();
                                $Lookup[$i]['Flag'] = $flag = $this->read_ushort();
                                $Lookup[$i]['SubtableCount'] = $this->read_ushort();
                                for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                        $Lookup[$i]['Subtable'][$c]['Offset'] = $Lookup[$i]['offset'] + $this->read_ushort();
                                }
                                // MarkFilteringSet = Index (base 0) into GDEF mark glyph sets structure
                                if (($flag & 0x0010) == 0x0010) {
                                        $Lookup[$i]['MarkFilteringSet'] = $this->read_ushort();
                                } else {
                                        $Lookup[$i]['MarkFilteringSet'] = '';
                                }

                                // Lookup Type 7: Extension
                                if ($Lookup[$i]['Type'] == 7) {
                                        // Overwrites new offset (32-bit) for each subtable, and a new lookup Type
                                        for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                                $this->seek($Lookup[$i]['Subtable'][$c]['Offset']);
                                                $ExtensionPosFormat = $this->read_ushort();
                                                $type = $this->read_ushort();
                                                $Lookup[$i]['Subtable'][$c]['Offset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ulong();
                                        }
                                        $Lookup[$i]['Type'] = $type;
                                }
                        }

//print_r($Lookup); exit;
                        //=====================================================================================
                        // Process (1) Whole LookupList
                        for ($i = 0; $i < $LookupCount; $i++) {
                                for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                        $this->seek($Lookup[$i]['Subtable'][$c]['Offset']);
                                        $SubstFormat = $this->read_ushort();
                                        $Lookup[$i]['Subtable'][$c]['Format'] = $SubstFormat;

                                        /*
                                          Lookup['Type'] Enumeration table for glyph substitution
                                          Value Type    Description
                                          1     Single  Replace one glyph with one glyph
                                          2     Multiple        Replace one glyph with more than one glyph
                                          3     Alternate       Replace one glyph with one of many glyphs
                                          4     Ligature        Replace multiple glyphs with one glyph
                                          5     Context Replace one or more glyphs in context
                                          6     Chaining Context        Replace one or more glyphs in chained context
                                          7     Extension Substitution  Extension mechanism for other substitutions (i.e. this excludes the Extension type substitution itself)
                                          8     Reverse chaining context single         Applied in reverse order, replace single glyph in chaining context
                                         */

                                        // LookupType 1: Single Substitution Subtable
                                        if ($Lookup[$i]['Type'] == 1) {
                                                $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                if ($SubstFormat == 1) { // Calculated output glyph indices
                                                        $Lookup[$i]['Subtable'][$c]['DeltaGlyphID'] = $this->read_short();
                                                } else if ($SubstFormat == 2) { // Specified output glyph indices
                                                        $GlyphCount = $this->read_ushort();
                                                        for ($g = 0; $g < $GlyphCount; $g++) {
                                                                $Lookup[$i]['Subtable'][$c]['Glyphs'][] = $this->read_ushort();
                                                        }
                                                }
                                        } // LookupType 2: Multiple Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 2) {
                                                $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                $Lookup[$i]['Subtable'][$c]['SequenceCount'] = $SequenceCount = $this->read_short();
                                                for ($s = 0; $s < $SequenceCount; $s++) {
                                                        $Lookup[$i]['Subtable'][$c]['Sequences'][$s]['Offset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_short();
                                                }
                                                for ($s = 0; $s < $SequenceCount; $s++) {
                                                        // Sequence Tables
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['Sequences'][$s]['Offset']);
                                                        $Lookup[$i]['Subtable'][$c]['Sequences'][$s]['GlyphCount'] = $this->read_short();
                                                        for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['Sequences'][$s]['GlyphCount']; $g++) {
                                                                $Lookup[$i]['Subtable'][$c]['Sequences'][$s]['SubstituteGlyphID'][] = $this->read_ushort();
                                                        }
                                                }
                                        } // LookupType 3: Alternate Forms
                                        else if ($Lookup[$i]['Type'] == 3) {
                                                $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                $Lookup[$i]['Subtable'][$c]['AlternateSetCount'] = $AlternateSetCount = $this->read_short();
                                                for ($s = 0; $s < $AlternateSetCount; $s++) {
                                                        $Lookup[$i]['Subtable'][$c]['AlternateSets'][$s]['Offset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_short();
                                                }

                                                for ($s = 0; $s < $AlternateSetCount; $s++) {
                                                        // AlternateSet Tables
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['AlternateSets'][$s]['Offset']);
                                                        $Lookup[$i]['Subtable'][$c]['AlternateSets'][$s]['GlyphCount'] = $this->read_short();
                                                        for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['AlternateSets'][$s]['GlyphCount']; $g++) {
                                                                $Lookup[$i]['Subtable'][$c]['AlternateSets'][$s]['SubstituteGlyphID'][] = $this->read_ushort();
                                                        }
                                                }
                                        } // LookupType 4: Ligature Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 4) {
                                                $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                $Lookup[$i]['Subtable'][$c]['LigSetCount'] = $LigSetCount = $this->read_short();
                                                for ($s = 0; $s < $LigSetCount; $s++) {
                                                        $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Offset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_short();
                                                }
                                                for ($s = 0; $s < $LigSetCount; $s++) {
                                                        // LigatureSet Tables
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Offset']);
                                                        $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigCount'] = $this->read_short();
                                                        for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigCount']; $g++) {
                                                                $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigatureOffset'][$g] = $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Offset'] + $this->read_ushort();
                                                        }
                                                }
                                                for ($s = 0; $s < $LigSetCount; $s++) {
                                                        for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigCount']; $g++) {
                                                                // Ligature tables
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigatureOffset'][$g]);
                                                                $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['LigGlyph'] = $this->read_ushort();
                                                                $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['CompCount'] = $this->read_ushort();
                                                                for ($l = 1; $l < $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['CompCount']; $l++) {
                                                                        $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['GlyphID'][$l] = $this->read_ushort();
                                                                }
                                                        }
                                                }
                                        } // LookupType 5: Contextual Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 5) {
                                                // Format 1: Context Substitution
                                                if ($SubstFormat == 1) {
                                                        $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['SubRuleSetCount'] = $SubRuleSetCount = $this->read_short();
                                                        for ($s = 0; $s < $SubRuleSetCount; $s++) {
                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['Offset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_short();
                                                        }
                                                        for ($s = 0; $s < $SubRuleSetCount; $s++) {
                                                                // SubRuleSet Tables
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['Offset']);
                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleCount'] = $this->read_short();
                                                                for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleCount']; $g++) {
                                                                        $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleOffset'][$g] = $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['Offset'] + $this->read_ushort();
                                                                }
                                                        }
                                                        for ($s = 0; $s < $SubRuleSetCount; $s++) {
                                                                // SubRule Tables
                                                                for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleCount']; $g++) {
                                                                        // Ligature tables
                                                                        $this->seek($Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleOffset'][$g]);

                                                                        $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['GlyphCount'] = $this->read_ushort();
                                                                        $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['SubstCount'] = $this->read_ushort();
                                                                        // "Input"::[GlyphCount - 1]::Array of input GlyphIDs-start with second glyph
                                                                        for ($l = 1; $l < $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['GlyphCount']; $l++) {
                                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['Input'][$l] = $this->read_ushort();
                                                                        }
                                                                        // "SubstLookupRecord"::[SubstCount]::Array of SubstLookupRecords-in design order
                                                                        for ($l = 0; $l < $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['SubstCount']; $l++) {
                                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['SubstLookupRecord'][$l]['SequenceIndex'] = $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$g]['SubstLookupRecord'][$l]['LookupListIndex'] = $this->read_ushort();
                                                                        }
                                                                }
                                                        }
                                                } // Format 2: Class-based Context Glyph Substitution
                                                else if ($SubstFormat == 2) {
                                                        $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['ClassDefOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['SubClassSetCnt'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['SubClassSetCnt']; $b++) {
                                                                $offset = $this->read_ushort();
                                                                if ($offset == 0x0000) {
                                                                        $Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][] = 0;
                                                                } else {
                                                                        $Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $offset;
                                                                }
                                                        }
                                                } else {
                                                        throw new \Mpdf\MpdfException("GPOS Lookup Type " . $Lookup[$i]['Type'] . ", Format " . $SubstFormat . " not supported (ttfontsuni.php).");
                                                }
                                        } // LookupType 6: Chaining Contextual Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 6) {
                                                // Format 1: Simple Chaining Context Glyph Substitution  p255
                                                if ($SubstFormat == 1) {
                                                        $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetCount'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetCount']; $b++) {
                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetOffset'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        }
                                                } // Format 2: Class-based Chaining Context Glyph Substitution  p257
                                                else if ($SubstFormat == 2) {
                                                        $Lookup[$i]['Subtable'][$c]['CoverageTableOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['BacktrackClassDefOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['InputClassDefOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['LookaheadClassDefOffset'] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        $Lookup[$i]['Subtable'][$c]['ChainSubClassSetCnt'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['ChainSubClassSetCnt']; $b++) {
                                                                $offset = $this->read_ushort();
                                                                if ($offset == 0x0000) {
                                                                        $Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][] = $offset;
                                                                } else {
                                                                        $Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $offset;
                                                                }
                                                        }
                                                } // Format 3: Coverage-based Chaining Context Glyph Substitution  p259
                                                else if ($SubstFormat == 3) {
                                                        $Lookup[$i]['Subtable'][$c]['BacktrackGlyphCount'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['BacktrackGlyphCount']; $b++) {
                                                                $Lookup[$i]['Subtable'][$c]['CoverageBacktrack'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        }
                                                        $Lookup[$i]['Subtable'][$c]['InputGlyphCount'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['InputGlyphCount']; $b++) {
                                                                $Lookup[$i]['Subtable'][$c]['CoverageInput'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        }
                                                        $Lookup[$i]['Subtable'][$c]['LookaheadGlyphCount'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['LookaheadGlyphCount']; $b++) {
                                                                $Lookup[$i]['Subtable'][$c]['CoverageLookahead'][] = $Lookup[$i]['Subtable'][$c]['Offset'] + $this->read_ushort();
                                                        }
                                                        $Lookup[$i]['Subtable'][$c]['SubstCount'] = $this->read_ushort();
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['SubstCount']; $b++) {
                                                                $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['SequenceIndex'] = $this->read_ushort();
                                                                $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['LookupListIndex'] = $this->read_ushort();
                                                                /*
                                                                  Substitution Lookup Record
                                                                  All contextual substitution subtables specify the substitution data in a Substitution Lookup Record (SubstLookupRecord). Each record contains a SequenceIndex, which indicates the position where the substitution will occur in the glyph sequence. In addition, a LookupListIndex identifies the lookup to be applied at the glyph position specified by the SequenceIndex.
                                                                 */
                                                        }
                                                }
                                        } else {
                                                throw new \Mpdf\MpdfException("Lookup Type " . $Lookup[$i]['Type'] . " not supported.");
                                        }
                                }
                        }
//print_r($Lookup); exit;
                        //=====================================================================================
                        // Process (2) Whole LookupList
                        // Get Coverage tables and prepare preg_replace
                        for ($i = 0; $i < $LookupCount; $i++) {
                                for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                        $SubstFormat = $Lookup[$i]['Subtable'][$c]['Format'];

                                        // LookupType 1: Single Substitution Subtable 1 => 1
                                        if ($Lookup[$i]['Type'] == 1) {
                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                $glyphs = $this->_getCoverage(false);
                                                for ($g = 0; $g < count($glyphs); $g++) {
                                                        $replace = [];
                                                        $substitute = [];
                                                        $replace[] = unicode_hex($this->glyphToChar[$glyphs[$g]][0]);
                                                        // Flag = Ignore
                                                        if ($this->_checkGSUBignore($Lookup[$i]['Flag'], $replace[0], $Lookup[$i]['MarkFilteringSet'])) {
                                                                continue;
                                                        }
                                                        if (isset($Lookup[$i]['Subtable'][$c]['DeltaGlyphID'])) { // Format 1
                                                                $substitute[] = unicode_hex($this->glyphToChar[($glyphs[$g] + $Lookup[$i]['Subtable'][$c]['DeltaGlyphID'])][0]);
                                                        } else { // Format 2
                                                                $substitute[] = unicode_hex($this->glyphToChar[($Lookup[$i]['Subtable'][$c]['Glyphs'][$g])][0]);
                                                        }
                                                        $Lookup[$i]['Subtable'][$c]['subs'][] = ['Replace' => $replace, 'substitute' => $substitute];
                                                }
                                        } // LookupType 2: Multiple Substitution Subtable 1 => n
                                        else if ($Lookup[$i]['Type'] == 2) {
                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                $glyphs = $this->_getCoverage();
                                                for ($g = 0; $g < count($glyphs); $g++) {
                                                        $replace = [];
                                                        $substitute = [];
                                                        $replace[] = $glyphs[$g];
                                                        // Flag = Ignore
                                                        if ($this->_checkGSUBignore($Lookup[$i]['Flag'], $replace[0], $Lookup[$i]['MarkFilteringSet'])) {
                                                                continue;
                                                        }
                                                        if (!isset($Lookup[$i]['Subtable'][$c]['Sequences'][$g]['SubstituteGlyphID']) || count($Lookup[$i]['Subtable'][$c]['Sequences'][$g]['SubstituteGlyphID']) == 0) {
                                                                continue;
                                                        } // Illegal for GlyphCount to be 0; either error in font, or something has gone wrong - lets carry on for now!
                                                        foreach ($Lookup[$i]['Subtable'][$c]['Sequences'][$g]['SubstituteGlyphID'] as $sub) {
                                                                $substitute[] = unicode_hex($this->glyphToChar[$sub][0]);
                                                        }
                                                        $Lookup[$i]['Subtable'][$c]['subs'][] = ['Replace' => $replace, 'substitute' => $substitute];
                                                }
                                        } // LookupType 3: Alternate Forms 1 => 1 (only first alternate form is used)
                                        else if ($Lookup[$i]['Type'] == 3) {
                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                $glyphs = $this->_getCoverage();
                                                for ($g = 0; $g < count($glyphs); $g++) {
                                                        $replace = [];
                                                        $substitute = [];
                                                        $replace[] = $glyphs[$g];
                                                        // Flag = Ignore
                                                        if ($this->_checkGSUBignore($Lookup[$i]['Flag'], $replace[0], $Lookup[$i]['MarkFilteringSet'])) {
                                                                continue;
                                                        }
                                                        $gid = $Lookup[$i]['Subtable'][$c]['AlternateSets'][$g]['SubstituteGlyphID'][0];
                                                        if (!isset($this->glyphToChar[$gid][0])) {
                                                                continue;
                                                        }
                                                        $substitute[] = unicode_hex($this->glyphToChar[$gid][0]);
                                                        $Lookup[$i]['Subtable'][$c]['subs'][] = ['Replace' => $replace, 'substitute' => $substitute];
                                                }
                                        } // LookupType 4: Ligature Substitution Subtable n => 1
                                        else if ($Lookup[$i]['Type'] == 4) {
                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                $glyphs = $this->_getCoverage();
                                                $LigSetCount = $Lookup[$i]['Subtable'][$c]['LigSetCount'];
                                                for ($s = 0; $s < $LigSetCount; $s++) {
                                                        for ($g = 0; $g < $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['LigCount']; $g++) {
                                                                $replace = [];
                                                                $substitute = [];
                                                                $replace[] = $glyphs[$s];
                                                                // Flag = Ignore
                                                                if ($this->_checkGSUBignore($Lookup[$i]['Flag'], $replace[0], $Lookup[$i]['MarkFilteringSet'])) {
                                                                        continue;
                                                                }
                                                                for ($l = 1; $l < $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['CompCount']; $l++) {
                                                                        $gid = $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['GlyphID'][$l];
                                                                        $rpl = unicode_hex($this->glyphToChar[$gid][0]);
                                                                        // Flag = Ignore
                                                                        if ($this->_checkGSUBignore($Lookup[$i]['Flag'], $rpl, $Lookup[$i]['MarkFilteringSet'])) {
                                                                                continue 2;
                                                                        }
                                                                        $replace[] = $rpl;
                                                                }
                                                                $gid = $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['LigGlyph'];
                                                                if (!isset($this->glyphToChar[$gid][0])) {
                                                                        continue;
                                                                }
                                                                $substitute[] = unicode_hex($this->glyphToChar[$gid][0]);
                                                                $Lookup[$i]['Subtable'][$c]['subs'][] = ['Replace' => $replace, 'substitute' => $substitute, 'CompCount' => $Lookup[$i]['Subtable'][$c]['LigSet'][$s]['Ligature'][$g]['CompCount']];
                                                        }
                                                }
                                        } // LookupType 5: Contextual Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 5) {
                                                // Format 1: Context Substitution
                                                if ($SubstFormat == 1) {
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['CoverageGlyphs'] = $CoverageGlyphs = $this->_getCoverage();

                                                        for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['SubRuleSetCount']; $s++) {
                                                                $SubRuleSet = $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s];
                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['FirstGlyph'] = $CoverageGlyphs[$s];
                                                                for ($r = 0; $r < $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRuleCount']; $r++) {
                                                                        $GlyphCount = $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$r]['GlyphCount'];
                                                                        for ($g = 1; $g < $GlyphCount; $g++) {
                                                                                $glyphID = $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$r]['Input'][$g];
                                                                                $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'][$r]['InputGlyphs'][$g] = unicode_hex($this->glyphToChar[$glyphID][0]);
                                                                        }
                                                                }
                                                        }
                                                } // Format 2: Class-based Context Glyph Substitution
                                                else if ($SubstFormat == 2) {
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['CoverageGlyphs'] = $CoverageGlyphs = $this->_getCoverage();

                                                        $InputClasses = $this->_getClasses($Lookup[$i]['Subtable'][$c]['ClassDefOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['InputClasses'] = $InputClasses;
                                                        for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['SubClassSetCnt']; $s++) {
                                                                if ($Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][$s] > 0) {
                                                                        $this->seek($Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][$s]);
                                                                        $Lookup[$i]['Subtable'][$c]['SubClassSet'][$s]['SubClassRuleCnt'] = $SubClassRuleCnt = $this->read_ushort();
                                                                        $SubClassRule = [];
                                                                        for ($b = 0; $b < $SubClassRuleCnt; $b++) {
                                                                                $SubClassRule[$b] = $Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][$s] + $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['SubClassSet'][$s]['SubClassRule'][$b] = $SubClassRule[$b];
                                                                        }
                                                                }
                                                        }

                                                        for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['SubClassSetCnt']; $s++) {
                                                                if ($Lookup[$i]['Subtable'][$c]['SubClassSetOffset'][$s] > 0) {
                                                                        $SubClassRuleCnt = $Lookup[$i]['Subtable'][$c]['SubClassSet'][$s]['SubClassRuleCnt'];
                                                                        for ($b = 0; $b < $SubClassRuleCnt; $b++) {
                                                                                $this->seek($Lookup[$i]['Subtable'][$c]['SubClassSet'][$s]['SubClassRule'][$b]);
                                                                                $Rule = [];
                                                                                $Rule['InputGlyphCount'] = $this->read_ushort();
                                                                                $Rule['SubstCount'] = $this->read_ushort();
                                                                                for ($r = 1; $r < $Rule['InputGlyphCount']; $r++) {
                                                                                        $Rule['Input'][$r] = $this->read_ushort();
                                                                                }
                                                                                for ($r = 0; $r < $Rule['SubstCount']; $r++) {
                                                                                        $Rule['SequenceIndex'][$r] = $this->read_ushort();
                                                                                        $Rule['LookupListIndex'][$r] = $this->read_ushort();
                                                                                }

                                                                                $Lookup[$i]['Subtable'][$c]['SubClassSet'][$s]['SubClassRule'][$b] = $Rule;
                                                                        }
                                                                }
                                                        }
                                                } // Format 3: Coverage-based Context Glyph Substitution
                                                else if ($SubstFormat == 3) {
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['InputGlyphCount']; $b++) {
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageInput'][$b]);
                                                                $glyphs = $this->_getCoverage();
                                                                $Lookup[$i]['Subtable'][$c]['CoverageInputGlyphs'][] = implode("|", $glyphs);
                                                        }
                                                        throw new \Mpdf\MpdfException("Lookup Type 5, SubstFormat 3 not tested. Please report this with the name of font used - " . $this->fontkey);
                                                }
                                        } // LookupType 6: Chaining Contextual Substitution Subtable
                                        else if ($Lookup[$i]['Type'] == 6) {
                                                // Format 1: Simple Chaining Context Glyph Substitution  p255
                                                if ($SubstFormat == 1) {
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['CoverageGlyphs'] = $CoverageGlyphs = $this->_getCoverage();

                                                        $ChainSubRuleSetCnt = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetCount'];

                                                        for ($s = 0; $s < $ChainSubRuleSetCnt; $s++) {
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['ChainSubRuleSetOffset'][$s]);
                                                                $ChainSubRuleCnt = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRuleCount'] = $this->read_ushort();
                                                                for ($r = 0; $r < $ChainSubRuleCnt; $r++) {
                                                                        $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRuleOffset'][$r] = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetOffset'][$s] + $this->read_ushort();
                                                                }
                                                        }
                                                        for ($s = 0; $s < $ChainSubRuleSetCnt; $s++) {
                                                                $ChainSubRuleCnt = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRuleCount'];
                                                                for ($r = 0; $r < $ChainSubRuleCnt; $r++) {
                                                                        // ChainSubRule
                                                                        $this->seek($Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRuleOffset'][$r]);

                                                                        $BacktrackGlyphCount = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['BacktrackGlyphCount'] = $this->read_ushort();
                                                                        for ($g = 0; $g < $BacktrackGlyphCount; $g++) {
                                                                                $glyphID = $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['BacktrackGlyphs'][$g] = unicode_hex($this->glyphToChar[$glyphID][0]);
                                                                        }

                                                                        $InputGlyphCount = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['InputGlyphCount'] = $this->read_ushort();
                                                                        for ($g = 1; $g < $InputGlyphCount; $g++) {
                                                                                $glyphID = $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['InputGlyphs'][$g] = unicode_hex($this->glyphToChar[$glyphID][0]);
                                                                        }

                                                                        $LookaheadGlyphCount = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['LookaheadGlyphCount'] = $this->read_ushort();
                                                                        for ($g = 0; $g < $LookaheadGlyphCount; $g++) {
                                                                                $glyphID = $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['LookaheadGlyphs'][$g] = unicode_hex($this->glyphToChar[$glyphID][0]);
                                                                        }

                                                                        $SubstCount = $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['SubstCount'] = $this->read_ushort();
                                                                        for ($lu = 0; $lu < $SubstCount; $lu++) {
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['SequenceIndex'][$lu] = $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'][$r]['LookupListIndex'][$lu] = $this->read_ushort();
                                                                        }
                                                                }
                                                        }
                                                } // Format 2: Class-based Chaining Context Glyph Substitution  p257
                                                else if ($SubstFormat == 2) {
                                                        $this->seek($Lookup[$i]['Subtable'][$c]['CoverageTableOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['CoverageGlyphs'] = $CoverageGlyphs = $this->_getCoverage();

                                                        $BacktrackClasses = $this->_getClasses($Lookup[$i]['Subtable'][$c]['BacktrackClassDefOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['BacktrackClasses'] = $BacktrackClasses;

                                                        $InputClasses = $this->_getClasses($Lookup[$i]['Subtable'][$c]['InputClassDefOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['InputClasses'] = $InputClasses;

                                                        $LookaheadClasses = $this->_getClasses($Lookup[$i]['Subtable'][$c]['LookaheadClassDefOffset']);
                                                        $Lookup[$i]['Subtable'][$c]['LookaheadClasses'] = $LookaheadClasses;

                                                        for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['ChainSubClassSetCnt']; $s++) {
                                                                if ($Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][$s] > 0) {
                                                                        $this->seek($Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][$s]);
                                                                        $Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRuleCnt'] = $ChainSubClassRuleCnt = $this->read_ushort();
                                                                        $ChainSubClassRule = [];
                                                                        for ($b = 0; $b < $ChainSubClassRuleCnt; $b++) {
                                                                                $ChainSubClassRule[$b] = $Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][$s] + $this->read_ushort();
                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRule'][$b] = $ChainSubClassRule[$b];
                                                                        }
                                                                }
                                                        }

                                                        for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['ChainSubClassSetCnt']; $s++) {
                                                                if (isset($Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRuleCnt'])) {
                                                                        $ChainSubClassRuleCnt = $Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRuleCnt'];
                                                                } else {
                                                                        $ChainSubClassRuleCnt = 0;
                                                                }
                                                                for ($b = 0; $b < $ChainSubClassRuleCnt; $b++) {
                                                                        if ($Lookup[$i]['Subtable'][$c]['ChainSubClassSetOffset'][$s] > 0) {
                                                                                $this->seek($Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRule'][$b]);
                                                                                $Rule = [];
                                                                                $Rule['BacktrackGlyphCount'] = $this->read_ushort();
                                                                                for ($r = 0; $r < $Rule['BacktrackGlyphCount']; $r++) {
                                                                                        $Rule['Backtrack'][$r] = $this->read_ushort();
                                                                                }
                                                                                $Rule['InputGlyphCount'] = $this->read_ushort();
                                                                                for ($r = 1; $r < $Rule['InputGlyphCount']; $r++) {
                                                                                        $Rule['Input'][$r] = $this->read_ushort();
                                                                                }
                                                                                $Rule['LookaheadGlyphCount'] = $this->read_ushort();
                                                                                for ($r = 0; $r < $Rule['LookaheadGlyphCount']; $r++) {
                                                                                        $Rule['Lookahead'][$r] = $this->read_ushort();
                                                                                }
                                                                                $Rule['SubstCount'] = $this->read_ushort();
                                                                                for ($r = 0; $r < $Rule['SubstCount']; $r++) {
                                                                                        $Rule['SequenceIndex'][$r] = $this->read_ushort();
                                                                                        $Rule['LookupListIndex'][$r] = $this->read_ushort();
                                                                                }

                                                                                $Lookup[$i]['Subtable'][$c]['ChainSubClassSet'][$s]['ChainSubClassRule'][$b] = $Rule;
                                                                        }
                                                                }
                                                        }
                                                } // Format 3: Coverage-based Chaining Context Glyph Substitution  p259
                                                else if ($SubstFormat == 3) {
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['BacktrackGlyphCount']; $b++) {
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageBacktrack'][$b]);
                                                                $glyphs = $this->_getCoverage();
                                                                $Lookup[$i]['Subtable'][$c]['CoverageBacktrackGlyphs'][] = implode("|", $glyphs);
                                                        }
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['InputGlyphCount']; $b++) {
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageInput'][$b]);
                                                                $glyphs = $this->_getCoverage();
                                                                $Lookup[$i]['Subtable'][$c]['CoverageInputGlyphs'][] = implode("|", $glyphs);
                                                                // Don't use above value as these are ordered numerically not as need to process
                                                        }
                                                        for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['LookaheadGlyphCount']; $b++) {
                                                                $this->seek($Lookup[$i]['Subtable'][$c]['CoverageLookahead'][$b]);
                                                                $glyphs = $this->_getCoverage();
                                                                $Lookup[$i]['Subtable'][$c]['CoverageLookaheadGlyphs'][] = implode("|", $glyphs);
                                                        }
                                                }
                                        }
                                }
                        }

                        //=====================================================================================
                        //=====================================================================================
                        //=====================================================================================
                        //=====================================================================================

                        $GSUBScriptLang = [];
                        $rtlpua = []; // All glyphs added to PUA [for magic_reverse]
                        foreach ($gsub as $st => $scripts) {
                                foreach ($scripts as $t => $langsys) {
                                        $lul = []; // array of LookupListIndexes
                                        $tags = []; // corresponding array of feature tags e.g. 'ccmp'
//print_r($langsys ); exit;
                                        foreach ($langsys as $tag => $ft) {
                                                foreach ($ft as $ll) {
                                                        $lul[$ll] = $tag;
                                                }
                                        }
                                        ksort($lul); // Order the Lookups in the order they are in the GUSB table, regardless of Feature order
                                        $volt = $this->_getGSUBarray($Lookup, $lul, $st);
//print_r($lul); exit;
                                        //=====================================================================================
                                        //=====================================================================================
                                        // Interrogate $volt
                                        // isol, fin, medi, init(arab syrc) into $rtlSUB for use in ArabJoin
                                        // but also identify all RTL chars in PUA for magic_reverse (arab syrc hebr thaa nko  samr)
                                        // identify reph, matras, vatu, half forms etc for Indic for final re-ordering
                                        //=====================================================================================
                                        //=====================================================================================
                                        $rtl = [];
                                        $rtlSUB = "array()";
                                        $finals = '';
                                        if (strpos('arab syrc hebr thaa nko  samr', $st) !== false) { // all RTL scripts [any/all languages] ? Mandaic
//print_r($volt); exit;
                                                foreach ($volt as $v) {
                                                        // isol fina fin2 fin3 medi med2 for Syriac
                                                        // ISOLATED FORM :: FINAL :: INITIAL :: MEDIAL :: MED2 :: FIN2 :: FIN3
                                                        if (strpos('isol fina init medi fin2 fin3 med2', $v['tag']) !== false) {
                                                                $key = $v['match'];
                                                                $key = preg_replace('/[\(\)]*/', '', $key);
                                                                $sub = $v['replace'];
                                                                if ($v['tag'] == 'isol') {
                                                                        $kk = 0;
                                                                } else if ($v['tag'] == 'fina') {
                                                                        $kk = 1;
                                                                } else if ($v['tag'] == 'init') {
                                                                        $kk = 2;
                                                                } else if ($v['tag'] == 'medi') {
                                                                        $kk = 3;
                                                                } else if ($v['tag'] == 'med2') {
                                                                        $kk = 4;
                                                                } else if ($v['tag'] == 'fin2') {
                                                                        $kk = 5;
                                                                } else if ($v['tag'] == 'fin3') {
                                                                        $kk = 6;
                                                                }
                                                                $rtl[$key][$kk] = $sub;
                                                                if (isset($v['prel']) && count($v['prel'])) {
                                                                        $rtl[$key]['prel'][$kk] = $v['prel'];
                                                                }
                                                                if (isset($v['postl']) && count($v['postl'])) {
                                                                        $rtl[$key]['postl'][$kk] = $v['postl'];
                                                                }
                                                                if (isset($v['ignore']) && $v['ignore']) {
                                                                        $rtl[$key]['ignore'][$kk] = $v['ignore'];
                                                                }
                                                                $rtlpua[] = $sub;
                                                        } // Add any other glyphs which are in PUA
                                                        else {
                                                                if (isset($v['context']) && $v['context']) {
                                                                        foreach ($v['rules'] as $vs) {
                                                                                for ($i = 0; $i < count($vs['match']); $i++) {
                                                                                        if (isset($vs['replace'][$i]) && preg_match('/^0[A-F0-9]{4}$/', $vs['match'][$i])) {
                                                                                                if (preg_match('/^0[EF][A-F0-9]{3}$/', $vs['replace'][$i])) {
                                                                                                        $rtlpua[] = $vs['replace'][$i];
                                                                                                }
                                                                                        }
                                                                                }
                                                                        }
                                                                } else {
                                                                        preg_match_all('/\((0[A-F0-9]{4})\)/', $v['match'], $m);
                                                                        for ($i = 0; $i < count($m[0]); $i++) {
                                                                                $sb = explode(' ', $v['replace']);
                                                                                foreach ($sb as $sbg) {
                                                                                        if (preg_match('/(0[EF][A-F0-9]{3})/', $sbg, $mr)) {
                                                                                                $rtlpua[] = $mr[1];
                                                                                        }
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
//print_r($rtl); exit;
                                                // For kashida, need to determine all final forms except ones already identified by kashida
                                                // priority rules (see otl.php)
                                                foreach ($rtl as $base => $variants) {
                                                        if (isset($variants[1])) { // i.e. final form
                                                                if (strpos('0FE8E 0FE94 0FEA2 0FEAA 0FEAE 0FEC2 0FEDA 0FEDE 0FB93 0FECA 0FED2 0FED6 0FEEE 0FEF0 0FEF2', $variants[1]) === false) { // not already included
                                                                        // This version does not exclude RA (0631) FEAE; Ya (064A)  FEF2; Alef Maqsurah (0649) FEF0 which
                                                                        // are selected in priority if connected to a medial Bah
                                                                        //if (strpos('0FE8E 0FE94 0FEA2 0FEAA 0FEC2 0FEDA 0FEDE 0FB93 0FECA 0FED2 0FED6 0FEEE', $variants[1])===false) {        // not already included
                                                                        $finals .= $variants[1] . ' ';
                                                                }
                                                        }
                                                }
//echo $finals ; exit;
//print_r($rtlpua); exit;
                                                ksort($rtl);
                                                $a = var_export($rtl, true);
                                                $a = preg_replace('/\\\\\\\\/', "\\", $a);
                                                $a = preg_replace('/\'/', '"', $a);
                                                $a = preg_replace('/\r/', '', $a);
                                                $a = preg_replace('/> \n/', '>', $a);
                                                $a = preg_replace('/\n  \)/', ')', $a);
                                                $a = preg_replace('/\n    /', ' ', $a);
                                                $a = preg_replace('/\[IGNORE(\d+)\]/', '".$ignore[\\1]."', $a);
                                                $rtlSUB = preg_replace('/[ ]+/', ' ', $a);
                                        }
                                        //=====================================================================================
                                        // INDIC - Dynamic properties
                                        //=====================================================================================
                                        $rphf = [];
                                        $half = [];
                                        $pref = [];
                                        $blwf = [];
                                        $pstf = [];
                                        if (strpos('dev2 bng2 gur2 gjr2 ory2 tml2 tel2 knd2 mlm2 deva beng guru gujr orya taml telu knda mlym', $st) !== false) { // all INDIC scripts [any/all languages]
                                                if (strpos('deva beng guru gujr orya taml telu knda mlym', $st) !== false) {
                                                        $is_old_spec = true;
                                                } else {
                                                        $is_old_spec = false;
                                                }

                                                // First get 'locl' substitutions (reversed!)
                                                $loclsubs = [];
                                                foreach ($volt as $v) {
                                                        if (strpos('locl', $v['tag']) !== false) {
                                                                $key = $v['match'];
                                                                $key = preg_replace('/[\(\)]*/', '', $key);
                                                                $sub = $v['replace'];
                                                                if ($key && strlen(trim($key)) == 5 && $sub) {
                                                                        $loclsubs[$sub] = $key;
                                                                }
                                                        }
                                                }
//if (count($loclsubs)) { print_r($loclsubs); exit; }

                                                foreach ($volt as $v) {
                                                        // <rphf> <half> <pref> <blwf> <pstf>
                                                        // defines consonant types:
                                                        //     Reph <rphf>
                                                        //     Half forms <half>
                                                        //     Pre-base-reordering forms of Ra/Rra <pref>
                                                        //     Below-base forms <blwf>
                                                        //     Post-base forms <pstf>
                                                        // applied together with <locl> feature to input sequences consisting of two characters
                                                        // This is done for each consonant
                                                        // for <rphf> and <half>, features are applied to Consonant + Halant combinations
                                                        // for <pref>, <blwf> and <pstf>, features are applied to Halant + Consonant combinations
                                                        // Old version eg 'deva' <pref>, <blwf> and <pstf>, features are applied to Consonant + Halant
                                                        // Some malformed fonts still do Consonant + Halant for these - so match both??
                                                        // If these two glyphs form a ligature, with no additional glyphs in context
                                                        // this means the consonant has the corresponding form
                                                        // Currently set to cope with both
                                                        // See also classes/otl.php

                                                        if (strpos('rphf half pref blwf pstf', $v['tag']) !== false) {
                                                                if (isset($v['context']) && $v['context'] && $v['nBacktrack'] == 0 && $v['nLookahead'] == 0) {
                                                                        foreach ($v['rules'] as $vs) {
                                                                                if (count($vs['match']) == 2 && count($vs['replace']) == 1) {
                                                                                        $sub = $vs['replace'][0];
                                                                                        // If Halant Cons   <pref>, <blwf> and <pstf> in New version only
                                                                                        if (strpos('0094D 009CD 00A4D 00ACD 00B4D 00BCD 00C4D 00CCD 00D4D', $vs['match'][0]) !== false && strpos('pref blwf pstf', $v['tag']) !== false && !$is_old_spec) {
                                                                                                $key = $vs['match'][1];
                                                                                                $tag = $v['tag'];
                                                                                                if (isset($loclsubs[$key])) {
                                                                                                        ${$tag[$loclsubs[$key]]} = $sub;
                                                                                                }
                                                                                                $tmp = &$$tag;
                                                                                                $tmp[hexdec($key)] = hexdec($sub);
                                                                                        } // If Cons Halant    <rphf> and <half> always
                                                                                        // and <pref>, <blwf> and <pstf> in Old version
                                                                                        else if (strpos('0094D 009CD 00A4D 00ACD 00B4D 00BCD 00C4D 00CCD 00D4D', $vs['match'][1]) !== false && (strpos('rphf half', $v['tag']) !== false || (strpos('pref blwf pstf', $v['tag']) !== false && ($is_old_spec || _OTL_OLD_SPEC_COMPAT_2)))) {
                                                                                                $key = $vs['match'][0];
                                                                                                $tag = $v['tag'];
                                                                                                if (isset($loclsubs[$key])) {
                                                                                                        ${$tag[$loclsubs[$key]]} = $sub;
                                                                                                }
                                                                                                $tmp = &$$tag;
                                                                                                $tmp[hexdec($key)] = hexdec($sub);
                                                                                        }
                                                                                }
                                                                        }
                                                                } else if (!isset($v['context'])) {
                                                                        $key = $v['match'];
                                                                        $key = preg_replace('/[\(\)]*/', '', $key);
                                                                        $sub = $v['replace'];
                                                                        if ($key && strlen(trim($key)) == 11 && $sub) {
                                                                                // If Cons Halant    <rphf> and <half> always
                                                                                // and <pref>, <blwf> and <pstf> in Old version
                                                                                // If Halant Cons   <pref>, <blwf> and <pstf> in New version only
                                                                                if (strpos('0094D 009CD 00A4D 00ACD 00B4D 00BCD 00C4D 00CCD 00D4D', substr($key, 0, 5)) !== false && strpos('pref blwf pstf', $v['tag']) !== false && !$is_old_spec) {
                                                                                        $key = substr($key, 6, 5);
                                                                                        $tag = $v['tag'];
                                                                                        if (isset($loclsubs[$key])) {
                                                                                                ${$tag[$loclsubs[$key]]} = $sub;
                                                                                        }
                                                                                        $tmp = &$$tag;
                                                                                        $tmp[hexdec($key)] = hexdec($sub);
                                                                                } else if (strpos('0094D 009CD 00A4D 00ACD 00B4D 00BCD 00C4D 00CCD 00D4D', substr($key, 6, 5)) !== false && (strpos('rphf half', $v['tag']) !== false || (strpos('pref blwf pstf', $v['tag']) !== false && ($is_old_spec || _OTL_OLD_SPEC_COMPAT_2)))) {
                                                                                        $key = substr($key, 0, 5);
                                                                                        $tag = $v['tag'];
                                                                                        if (isset($loclsubs[$key])) {
                                                                                                ${$tag[$loclsubs[$key]]} = $sub;
                                                                                        }
                                                                                        $tmp = &$$tag;
                                                                                        $tmp[hexdec($key)] = hexdec($sub);
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
                                                /*
                                                  print_r($rphf );
                                                  print_r($half );
                                                  print_r($pref );
                                                  print_r($blwf );
                                                  print_r($pstf ); exit;
                                                 */
                                        }
//print_r($rtlpua); exit;
                                        //=====================================================================================
                                        //=====================================================================================
                                        //=====================================================================================
                                        //=====================================================================================
                                        if (count($rtl) || count($rphf) || count($half) || count($pref) || count($blwf) || count($pstf) || $finals) {
                                                // SAVE LOOKUPS TO FILE fontname.GSUB.scripttag.langtag.php

                                                $s = '<?php

$rtlSUB = ' . $rtlSUB . ';
$finals = \'' . $finals . '\';
$rphf = ' . var_export($rphf, true) . ';
$half = ' . var_export($half, true) . ';
$pref = ' . var_export($pref, true) . ';
$blwf = ' . var_export($blwf, true) . ';
$pstf = ' . var_export($pstf, true) . ';

 ' . "\n" . '?>';

                                                $this->fontCache->write($this->fontkey . '.GSUB.' . $st . '.' . $t . '.php', $s);
                                        }
                                        //=====================================================================================
                                        if (!isset($GSUBScriptLang[$st])) {
                                                $GSUBScriptLang[$st] = '';
                                        }
                                        $GSUBScriptLang[$st] .= $t . ' ';
                                        //=====================================================================================
                                }
                        }
                        //print_r($rtlpua); exit;
                        // All RTL glyphs from font added to (or already in) PUA [reqd for magic_reverse]
                        $rtlPUAstr = "";
                        if (count($rtlpua)) {
                                $rtlpua = array_unique($rtlpua);
                                sort($rtlpua);
                                $n = count($rtlpua);
                                for ($i = 0; $i < $n; $i++) {
                                        if (hexdec($rtlpua[$i]) < hexdec('E000') || hexdec($rtlpua[$i]) > hexdec('F8FF')) {
                                                unset($rtlpua[$i]);
                                        }
                                }
                                sort($rtlpua, SORT_STRING);

                                $rangeid = -1;
                                $range = [];
                                $prevgid = -2;
                                // for each character
                                foreach ($rtlpua as $gidhex) {
                                        $gid = hexdec($gidhex);
                                        if ($gid == ($prevgid + 1)) {
                                                $range[$rangeid]['end'] = $gidhex;
                                                $range[$rangeid]['count']++;
                                        } else {
                                                // new range
                                                $rangeid++;
                                                $range[$rangeid] = [];
                                                $range[$rangeid]['start'] = $gidhex;
                                                $range[$rangeid]['end'] = $gidhex;
                                                $range[$rangeid]['count'] = 1;
                                        }
                                        $prevgid = $gid;
                                }
                                foreach ($range as $rg) {
                                        if ($rg['count'] == 1) {
                                                $rtlPUAstr .= "\x{" . $rg['start'] . "}";
                                        } else if ($rg['count'] == 2) {
                                                $rtlPUAstr .= "\x{" . $rg['start'] . "}\x{" . $rg['end'] . "}";
                                        } else {
                                                $rtlPUAstr .= "\x{" . $rg['start'] . "}-\x{" . $rg['end'] . "}";
                                        }
                                }
                        }

                        //print_r($rtlPUAstr ); exit;
                        //=====================================================================================
                        //=====================================================================================
                        //=====================================================================================
                        //=====================================================================================
                        //print_r($rtlpua); exit;
                        //print_r($GSUBScriptLang); exit;
                }

//print_r($Lookup); exit;

                return [$GSUBScriptLang, $gsub, $GSLookup, $rtlPUAstr]; // , $rtlPUAarr Not needed
        }

        /////////////////////////////////////////////////////////////////////////////////////////
        // GSUB functions
        function _getGSUBarray(&$Lookup, &$lul, $scripttag)
        {
                // Process (3) LookupList for specific Script-LangSys
                // Generate preg_replace
                $volt = [];
                $reph = '';
                $matraE = '';
                $vatu = '';
                foreach ($lul as $i => $tag) {
                        for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                $SubstFormat = $Lookup[$i]['Subtable'][$c]['Format'];

                                // LookupType 1: Single Substitution Subtable
                                if ($Lookup[$i]['Type'] == 1) {
                                        for ($s = 0; $s < count($Lookup[$i]['Subtable'][$c]['subs']); $s++) {
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['subs'][$s]['Replace'];
                                                $substitute = $Lookup[$i]['Subtable'][$c]['subs'][$s]['substitute'][0];
                                                // Ignore has already been applied earlier on
                                                $repl = $this->_makeGSUBinputMatch($inputGlyphs, "()");
                                                $subs = $this->_makeGSUBinputReplacement(1, $substitute, "()", 0, 1, 0);
                                                $volt[] = ['match' => $repl, 'replace' => $subs, 'tag' => $tag, 'key' => $inputGlyphs[0], 'type' => 1];
                                        }
                                } // LookupType 2: Multiple Substitution Subtable
                                else if ($Lookup[$i]['Type'] == 2) {
                                        for ($s = 0; $s < count($Lookup[$i]['Subtable'][$c]['subs']); $s++) {
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['subs'][$s]['Replace'];
                                                $substitute = implode(" ", $Lookup[$i]['Subtable'][$c]['subs'][$s]['substitute']);
                                                // Ignore has already been applied earlier on
                                                $repl = $this->_makeGSUBinputMatch($inputGlyphs, "()");
                                                $subs = $this->_makeGSUBinputReplacement(1, $substitute, "()", 0, 1, 0);
                                                $volt[] = ['match' => $repl, 'replace' => $subs, 'tag' => $tag, 'key' => $inputGlyphs[0], 'type' => 2];
                                        }
                                } // LookupType 3: Alternate Forms
                                else if ($Lookup[$i]['Type'] == 3) {
                                        for ($s = 0; $s < count($Lookup[$i]['Subtable'][$c]['subs']); $s++) {
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['subs'][$s]['Replace'];
                                                $substitute = $Lookup[$i]['Subtable'][$c]['subs'][$s]['substitute'][0];
                                                // Ignore has already been applied earlier on
                                                $repl = $this->_makeGSUBinputMatch($inputGlyphs, "()");
                                                $subs = $this->_makeGSUBinputReplacement(1, $substitute, "()", 0, 1, 0);
                                                $volt[] = ['match' => $repl, 'replace' => $subs, 'tag' => $tag, 'key' => $inputGlyphs[0], 'type' => 3];
                                        }
                                } // LookupType 4: Ligature Substitution Subtable
                                else if ($Lookup[$i]['Type'] == 4) {
                                        for ($s = 0; $s < count($Lookup[$i]['Subtable'][$c]['subs']); $s++) {
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['subs'][$s]['Replace'];
                                                $substitute = $Lookup[$i]['Subtable'][$c]['subs'][$s]['substitute'][0];
                                                // Ignore has already been applied earlier on
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                $repl = $this->_makeGSUBinputMatch($inputGlyphs, $ignore);
                                                $subs = $this->_makeGSUBinputReplacement(count($inputGlyphs), $substitute, $ignore, 0, count($inputGlyphs), 0);
                                                $volt[] = ['match' => $repl, 'replace' => $subs, 'tag' => $tag, 'key' => $inputGlyphs[0], 'type' => 4, 'CompCount' => $Lookup[$i]['Subtable'][$c]['subs'][$s]['CompCount'], 'Lig' => $substitute];
                                        }
                                } // LookupType 5: Chaining Contextual Substitution Subtable
                                else if ($Lookup[$i]['Type'] == 5) {
                                        // Format 1: Context Substitution
                                        if ($SubstFormat == 1) {
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['SubRuleSetCount']; $s++) {
                                                        // SubRuleSet
                                                        $subRule = [];
                                                        foreach ($Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['SubRule'] as $rule) {
                                                                // SubRule
                                                                $inputGlyphs = [];
                                                                if ($rule['GlyphCount'] > 1) {
                                                                        $inputGlyphs = $rule['InputGlyphs'];
                                                                }
                                                                $inputGlyphs[0] = $Lookup[$i]['Subtable'][$c]['SubRuleSet'][$s]['FirstGlyph'];
                                                                ksort($inputGlyphs);
                                                                $nInput = count($inputGlyphs);

                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => '', 'match' => $contextInputMatch, 'nBacktrack' => 0, 'nInput' => $nInput, 'nLookahead' => 0, 'rules' => [],];

                                                                for ($b = 0; $b < $rule['SubstCount']; $b++) {
                                                                        $lup = $rule['SubstLookupRecord'][$b]['LookupListIndex'];
                                                                        $seqIndex = $rule['SubstLookupRecord'][$b]['SequenceIndex'];

                                                                        // $Lookup[$lup] = secondary Lookup
                                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                                if (count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                                $mLen = count($lookupGlyphs);

                                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                                // then apply the substitution
                                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                                        continue;
                                                                                                }
                                                                                                $REPL = implode(" ", $luss['substitute']);
                                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                                } else {
                                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                                }
                                                                                        }
                                                                                }
                                                                        }
                                                                }

                                                                if (count($subRule['rules'])) {
                                                                        $volt[] = $subRule;
                                                                }
                                                        }
                                                }
                                        } // Format 2: Class-based Context Glyph Substitution
                                        else if ($SubstFormat == 2) {
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                foreach ($Lookup[$i]['Subtable'][$c]['SubClassSet'] as $inputClass => $cscs) {
                                                        for ($cscrule = 0; $cscrule < $cscs['SubClassRuleCnt']; $cscrule++) {
                                                                $rule = $cscs['SubClassRule'][$cscrule];

                                                                $inputGlyphs = [];

                                                                $inputGlyphs[0] = $Lookup[$i]['Subtable'][$c]['InputClasses'][$inputClass];
                                                                if ($rule['InputGlyphCount'] > 1) {
                                                                        //  NB starts at 1
                                                                        for ($gcl = 1; $gcl < $rule['InputGlyphCount']; $gcl++) {
                                                                                $classindex = $rule['Input'][$gcl];
                                                                                if (isset($Lookup[$i]['Subtable'][$c]['InputClasses'][$classindex])) {
                                                                                        $inputGlyphs[$gcl] = $Lookup[$i]['Subtable'][$c]['InputClasses'][$classindex];
                                                                                } // if class[0] = all glyphs excluding those specified in all other classes
                                                                                // set to blank '' for now
                                                                                else {
                                                                                        $inputGlyphs[$gcl] = '';
                                                                                }
                                                                        }
                                                                }

                                                                $nInput = $rule['InputGlyphCount'];

                                                                $nIsubs = (2 * $nInput) - 1;

                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => '', 'match' => $contextInputMatch, 'nBacktrack' => 0, 'nInput' => $nInput, 'nLookahead' => 0, 'rules' => [],];

                                                                for ($b = 0; $b < $rule['SubstCount']; $b++) {
                                                                        $lup = $rule['LookupListIndex'][$b];
                                                                        $seqIndex = $rule['SequenceIndex'][$b];

                                                                        // $Lookup[$lup] = secondary Lookup
                                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                                if (isset($Lookup[$lup]['Subtable'][$lus]['subs']) && count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                                $mLen = count($lookupGlyphs);

                                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                                // then apply the substitution
                                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                                        continue;
                                                                                                }

                                                                                                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                                                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex);
                                                                                                $REPL = implode(" ", $luss['substitute']);
                                                                                                // Returns e.g. "REPL\${6}\${8}" or "\${1}\${2} \${3} REPL\${4}\${6}\${8} \${9}"

                                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                                } else {
                                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                                }
                                                                                        }
                                                                                }
                                                                        }
                                                                }
                                                                if (count($subRule['rules'])) {
                                                                        $volt[] = $subRule;
                                                                }
                                                        }
                                                }
                                        } // Format 3: Coverage-based Context Glyph Substitution  p259
                                        else if ($SubstFormat == 3) {
                                                // IgnoreMarks flag set on main Lookup table
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageInputGlyphs'];
                                                $CoverageInputGlyphs = implode('|', $inputGlyphs);
                                                $nInput = $Lookup[$i]['Subtable'][$c]['InputGlyphCount'];

                                                if ($Lookup[$i]['Subtable'][$c]['BacktrackGlyphCount']) {
                                                        $backtrackGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageBacktrackGlyphs'];
                                                } else {
                                                        $backtrackGlyphs = [];
                                                }
                                                // Returns e.g. ¦(FEEB|FEEC)(ignore) ¦(FD12|FD13)(ignore) ¦
                                                $backtrackMatch = $this->_makeGSUBbacktrackMatch($backtrackGlyphs, $ignore);

                                                if ($Lookup[$i]['Subtable'][$c]['LookaheadGlyphCount']) {
                                                        $lookaheadGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageLookaheadGlyphs'];
                                                } else {
                                                        $lookaheadGlyphs = [];
                                                }
                                                // Returns e.g. ¦(ignore) (FD12|FD13)¦(ignore) (FEEB|FEEC)¦
                                                $lookaheadMatch = $this->_makeGSUBlookaheadMatch($lookaheadGlyphs, $ignore);

                                                $nBsubs = 2 * count($backtrackGlyphs);
                                                $nIsubs = (2 * $nInput) - 1;
                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => $backtrackMatch, 'match' => ($contextInputMatch . $lookaheadMatch), 'nBacktrack' => count($backtrackGlyphs), 'nInput' => $nInput, 'nLookahead' => count($lookaheadGlyphs), 'rules' => [],];

                                                for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['SubstCount']; $b++) {
                                                        $lup = $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['LookupListIndex'];
                                                        $seqIndex = $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['SequenceIndex'];
                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                if (count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                $mLen = count($lookupGlyphs);

                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                // then apply the substitution
                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                        continue;
                                                                                }

                                                                                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex);
                                                                                $REPL = implode(" ", $luss['substitute']);

                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                } else {
                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
                                                if (count($subRule['rules'])) {
                                                        $volt[] = $subRule;
                                                }
                                        }

//print_r($Lookup[$i]);
//print_r($volt[(count($volt)-1)]); exit;
                                } // LookupType 6: ing Contextual Substitution Subtable
                                else if ($Lookup[$i]['Type'] == 6) {
                                        // Format 1: Simple Chaining Context Glyph Substitution  p255
                                        if ($SubstFormat == 1) {
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                for ($s = 0; $s < $Lookup[$i]['Subtable'][$c]['ChainSubRuleSetCount']; $s++) {
                                                        // ChainSubRuleSet
                                                        $subRule = [];
                                                        $firstInputGlyph = $Lookup[$i]['Subtable'][$c]['CoverageGlyphs'][$s]; // First input gyyph
                                                        foreach ($Lookup[$i]['Subtable'][$c]['ChainSubRuleSet'][$s]['ChainSubRule'] as $rule) {
                                                                // ChainSubRule
                                                                $inputGlyphs = [];
                                                                if ($rule['InputGlyphCount'] > 1) {
                                                                        $inputGlyphs = $rule['InputGlyphs'];
                                                                }
                                                                $inputGlyphs[0] = $firstInputGlyph;
                                                                ksort($inputGlyphs);
                                                                $nInput = count($inputGlyphs);

                                                                if ($rule['BacktrackGlyphCount']) {
                                                                        $backtrackGlyphs = $rule['BacktrackGlyphs'];
                                                                } else {
                                                                        $backtrackGlyphs = [];
                                                                }
                                                                $backtrackMatch = $this->_makeGSUBbacktrackMatch($backtrackGlyphs, $ignore);

                                                                if ($rule['LookaheadGlyphCount']) {
                                                                        $lookaheadGlyphs = $rule['LookaheadGlyphs'];
                                                                } else {
                                                                        $lookaheadGlyphs = [];
                                                                }

                                                                $lookaheadMatch = $this->_makeGSUBlookaheadMatch($lookaheadGlyphs, $ignore);

                                                                $nBsubs = 2 * count($backtrackGlyphs);
                                                                $nIsubs = (2 * $nInput) - 1;

                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => $backtrackMatch, 'match' => ($contextInputMatch . $lookaheadMatch), 'nBacktrack' => count($backtrackGlyphs), 'nInput' => $nInput, 'nLookahead' => count($lookaheadGlyphs), 'rules' => [],];

                                                                for ($b = 0; $b < $rule['SubstCount']; $b++) {
                                                                        $lup = $rule['LookupListIndex'][$b];
                                                                        $seqIndex = $rule['SequenceIndex'][$b];

                                                                        // $Lookup[$lup] = secondary Lookup
                                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                                if (count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                                $mLen = count($lookupGlyphs);

                                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                                // then apply the substitution
                                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                                        continue;
                                                                                                }

                                                                                                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                                                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex);

                                                                                                $REPL = implode(" ", $luss['substitute']);

                                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                                } else {
                                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                                }
                                                                                        }
                                                                                }
                                                                        }
                                                                }

                                                                if (count($subRule['rules'])) {
                                                                        $volt[] = $subRule;
                                                                }
                                                        }
                                                }
                                        } // Format 2: Class-based Chaining Context Glyph Substitution  p257
                                        else if ($SubstFormat == 2) {
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                foreach ($Lookup[$i]['Subtable'][$c]['ChainSubClassSet'] as $inputClass => $cscs) {
                                                        for ($cscrule = 0; $cscrule < $cscs['ChainSubClassRuleCnt']; $cscrule++) {
                                                                $rule = $cscs['ChainSubClassRule'][$cscrule];

                                                                // These contain classes of glyphs as strings
                                                                // $Lookup[$i]['Subtable'][$c]['InputClasses'][(class)] e.g. 02E6|02E7|02E8
                                                                // $Lookup[$i]['Subtable'][$c]['LookaheadClasses'][(class)]
                                                                // $Lookup[$i]['Subtable'][$c]['BacktrackClasses'][(class)]
                                                                // These contain arrays of classIndexes
                                                                // [Backtrack] [Lookahead] and [Input] (Input is from the second position only)

                                                                $inputGlyphs = [];

                                                                if (isset($Lookup[$i]['Subtable'][$c]['InputClasses'][$inputClass])) {
                                                                        $inputGlyphs[0] = $Lookup[$i]['Subtable'][$c]['InputClasses'][$inputClass];
                                                                } else {
                                                                        $inputGlyphs[0] = '';
                                                                }
                                                                if ($rule['InputGlyphCount'] > 1) {
                                                                        //  NB starts at 1
                                                                        for ($gcl = 1; $gcl < $rule['InputGlyphCount']; $gcl++) {
                                                                                $classindex = $rule['Input'][$gcl];
                                                                                if (isset($Lookup[$i]['Subtable'][$c]['InputClasses'][$classindex])) {
                                                                                        $inputGlyphs[$gcl] = $Lookup[$i]['Subtable'][$c]['InputClasses'][$classindex];
                                                                                } // if class[0] = all glyphs excluding those specified in all other classes
                                                                                // set to blank '' for now
                                                                                else {
                                                                                        $inputGlyphs[$gcl] = '';
                                                                                }
                                                                        }
                                                                }

                                                                $nInput = $rule['InputGlyphCount'];

                                                                if ($rule['BacktrackGlyphCount']) {
                                                                        for ($gcl = 0; $gcl < $rule['BacktrackGlyphCount']; $gcl++) {
                                                                                $classindex = $rule['Backtrack'][$gcl];
                                                                                if (isset($Lookup[$i]['Subtable'][$c]['BacktrackClasses'][$classindex])) {
                                                                                        $backtrackGlyphs[$gcl] = $Lookup[$i]['Subtable'][$c]['BacktrackClasses'][$classindex];
                                                                                } // if class[0] = all glyphs excluding those specified in all other classes
                                                                                // set to blank '' for now
                                                                                else {
                                                                                        $backtrackGlyphs[$gcl] = '';
                                                                                }
                                                                        }
                                                                } else {
                                                                        $backtrackGlyphs = [];
                                                                }
                                                                // Returns e.g. ¦(FEEB|FEEC)(ignore) ¦(FD12|FD13)(ignore) ¦
                                                                $backtrackMatch = $this->_makeGSUBbacktrackMatch($backtrackGlyphs, $ignore);

                                                                if ($rule['LookaheadGlyphCount']) {
                                                                        for ($gcl = 0; $gcl < $rule['LookaheadGlyphCount']; $gcl++) {
                                                                                $classindex = $rule['Lookahead'][$gcl];
                                                                                if (isset($Lookup[$i]['Subtable'][$c]['LookaheadClasses'][$classindex])) {
                                                                                        $lookaheadGlyphs[$gcl] = $Lookup[$i]['Subtable'][$c]['LookaheadClasses'][$classindex];
                                                                                } // if class[0] = all glyphs excluding those specified in all other classes
                                                                                // set to blank '' for now
                                                                                else {
                                                                                        $lookaheadGlyphs[$gcl] = '';
                                                                                }
                                                                        }
                                                                } else {
                                                                        $lookaheadGlyphs = [];
                                                                }
                                                                // Returns e.g. ¦(ignore) (FD12|FD13)¦(ignore) (FEEB|FEEC)¦
                                                                $lookaheadMatch = $this->_makeGSUBlookaheadMatch($lookaheadGlyphs, $ignore);

                                                                $nBsubs = 2 * count($backtrackGlyphs);
                                                                $nIsubs = (2 * $nInput) - 1;

                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => $backtrackMatch, 'match' => ($contextInputMatch . $lookaheadMatch), 'nBacktrack' => count($backtrackGlyphs), 'nInput' => $nInput, 'nLookahead' => count($lookaheadGlyphs), 'rules' => [],];

                                                                for ($b = 0; $b < $rule['SubstCount']; $b++) {
                                                                        $lup = $rule['LookupListIndex'][$b];
                                                                        $seqIndex = $rule['SequenceIndex'][$b];

                                                                        // $Lookup[$lup] = secondary Lookup
                                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                                if (count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                                $mLen = count($lookupGlyphs);

                                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                                // then apply the substitution
                                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                                        continue;
                                                                                                }

                                                                                                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                                                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex);
                                                                                                $REPL = implode(" ", $luss['substitute']);
                                                                                                // Returns e.g. "REPL\${6}\${8}" or "\${1}\${2} \${3} REPL\${4}\${6}\${8} \${9}"

                                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                                } else {
                                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                                }
                                                                                        }
                                                                                }
                                                                        }
                                                                }
                                                                if (count($subRule['rules'])) {
                                                                        $volt[] = $subRule;
                                                                }
                                                        }
                                                }

//print_r($Lookup[$i]['Subtable'][$c]); exit;
                                        } // Format 3: Coverage-based Chaining Context Glyph Substitution  p259
                                        else if ($SubstFormat == 3) {
                                                // IgnoreMarks flag set on main Lookup table
                                                $ignore = $this->_getGSUBignoreString($Lookup[$i]['Flag'], $Lookup[$i]['MarkFilteringSet']);
                                                $inputGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageInputGlyphs'];
                                                $CoverageInputGlyphs = implode('|', $inputGlyphs);
                                                $nInput = $Lookup[$i]['Subtable'][$c]['InputGlyphCount'];

                                                if ($Lookup[$i]['Subtable'][$c]['BacktrackGlyphCount']) {
                                                        $backtrackGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageBacktrackGlyphs'];
                                                } else {
                                                        $backtrackGlyphs = [];
                                                }
                                                // Returns e.g. ¦(FEEB|FEEC)(ignore) ¦(FD12|FD13)(ignore) ¦
                                                $backtrackMatch = $this->_makeGSUBbacktrackMatch($backtrackGlyphs, $ignore);

                                                if ($Lookup[$i]['Subtable'][$c]['LookaheadGlyphCount']) {
                                                        $lookaheadGlyphs = $Lookup[$i]['Subtable'][$c]['CoverageLookaheadGlyphs'];
                                                } else {
                                                        $lookaheadGlyphs = [];
                                                }
                                                // Returns e.g. ¦(ignore) (FD12|FD13)¦(ignore) (FEEB|FEEC)¦
                                                $lookaheadMatch = $this->_makeGSUBlookaheadMatch($lookaheadGlyphs, $ignore);

                                                $nBsubs = 2 * count($backtrackGlyphs);
                                                $nIsubs = (2 * $nInput) - 1;
                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, [], 0);
                                                $subRule = ['context' => 1, 'tag' => $tag, 'matchback' => $backtrackMatch, 'match' => ($contextInputMatch . $lookaheadMatch), 'nBacktrack' => count($backtrackGlyphs), 'nInput' => $nInput, 'nLookahead' => count($lookaheadGlyphs), 'rules' => [],];

                                                for ($b = 0; $b < $Lookup[$i]['Subtable'][$c]['SubstCount']; $b++) {
                                                        $lup = $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['LookupListIndex'];
                                                        $seqIndex = $Lookup[$i]['Subtable'][$c]['SubstLookupRecord'][$b]['SequenceIndex'];
                                                        for ($lus = 0; $lus < $Lookup[$lup]['SubtableCount']; $lus++) {
                                                                if (count($Lookup[$lup]['Subtable'][$lus]['subs'])) {
                                                                        foreach ($Lookup[$lup]['Subtable'][$lus]['subs'] as $luss) {
                                                                                $lookupGlyphs = $luss['Replace'];
                                                                                $mLen = count($lookupGlyphs);

                                                                                // Only apply if the (first) 'Replace' glyph from the
                                                                                // Lookup list is in the [inputGlyphs] at ['SequenceIndex']
                                                                                // then apply the substitution
                                                                                if (strpos($inputGlyphs[$seqIndex], $lookupGlyphs[0]) === false) {
                                                                                        continue;
                                                                                }

                                                                                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                                                                                $contextInputMatch = $this->_makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex);
                                                                                $REPL = implode(" ", $luss['substitute']);

                                                                                if (strpos("isol fina fin2 fin3 medi med2 init ", $tag) !== false && $scripttag == 'arab') {
                                                                                        $volt[] = ['match' => $lookupGlyphs[0], 'replace' => $REPL, 'tag' => $tag, 'prel' => $backtrackGlyphs, 'postl' => $lookaheadGlyphs, 'ignore' => $ignore];
                                                                                } else {
                                                                                        $subRule['rules'][] = ['type' => $Lookup[$lup]['Type'], 'match' => $lookupGlyphs, 'replace' => $luss['substitute'], 'seqIndex' => $seqIndex, 'key' => $lookupGlyphs[0],];
                                                                                }
                                                                        }
                                                                }
                                                        }
                                                }
                                                if (count($subRule['rules'])) {
                                                        $volt[] = $subRule;
                                                }
                                        }
                                }
                        }
                }

//print_r($Lookup); exit;
                return $volt;
        }

        //=====================================================================================
        //=====================================================================================
        // mPDF 5.7.1
        function _checkGSUBignore($flag, $glyph, $MarkFilteringSet)
        {
                $ignore = false;
                // Flag & 0x0008 = Ignore Marks - (unless already done with MarkAttachmentType)
                if ((($flag & 0x0008) == 0x0008 && ($flag & 0xFF00) == 0) && strpos($this->GlyphClassMarks, $glyph)) {
                        $ignore = true;
                }
                if ((($flag & 0x0004) == 0x0004) && strpos($this->GlyphClassLigatures, $glyph)) {
                        $ignore = true;
                }
                if ((($flag & 0x0002) == 0x0002) && strpos($this->GlyphClassBases, $glyph)) {
                        $ignore = true;
                }
                // Flag & 0xFF?? = MarkAttachmentType
                if ($flag & 0xFF00) {
                        // "a lookup must ignore any mark glyphs that are not in the specified mark attachment class"
                        // $this->MarkAttachmentType is already adjusted for this i.e. contains all Marks except those in the MarkAttachmentClassDef table
                        if (strpos($this->MarkAttachmentType[($flag >> 8)], $glyph)) {
                                $ignore = true;
                        }
                }
                // Flag & 0x0010 = UseMarkFilteringSet
                if (($flag & 0x0010) && strpos($this->MarkGlyphSets[$MarkFilteringSet], $glyph)) {
                        $ignore = true;
                }

                return $ignore;
        }

        function _getGSUBignoreString($flag, $MarkFilteringSet)
        {
                // If ignoreFlag set, combine all ignore glyphs into -> "((?:(?: FBA1| FBA2| FBA3))*)"
                // else "()"
                // for Input - set on secondary Lookup table if in Context, and set Backtrack and Lookahead on Context Lookup
                $str = "";
                $ignoreflag = 0;

                // Flag & 0xFF?? = MarkAttachmentType
                if ($flag & 0xFF00) {
                        // "a lookup must ignore any mark glyphs that are not in the specified mark attachment class"
                        // $this->MarkAttachmentType is already adjusted for this i.e. contains all Marks except those in the MarkAttachmentClassDef table
                        $MarkAttachmentType = $flag >> 8;
                        $ignoreflag = $flag;
                        $str = $this->MarkAttachmentType[$MarkAttachmentType];
                }

                // Flag & 0x0010 = UseMarkFilteringSet
                if ($flag & 0x0010) {
                        throw new \Mpdf\MpdfException("This font " . $this->fontkey . " contains MarkGlyphSets - Not tested yet");
                        $str = $this->MarkGlyphSets[$MarkFilteringSet];
                }

                // If Ignore Marks set, supercedes any above
                // Flag & 0x0008 = Ignore Marks - (unless already done with MarkAttachmentType)
                if (($flag & 0x0008) == 0x0008 && ($flag & 0xFF00) == 0) {
                        $ignoreflag = 8;
                        $str = $this->GlyphClassMarks;
                }

                // Flag & 0x0004 = Ignore Ligatures
                if (($flag & 0x0004) == 0x0004) {
                        $ignoreflag += 4;
                        if ($str) {
                                $str .= "|";
                        }
                        $str .= $this->GlyphClassLigatures;
                }
                // Flag & 0x0002 = Ignore BaseGlyphs
                if (($flag & 0x0002) == 0x0002) {
                        $ignoreflag += 2;
                        if ($str) {
                                $str .= "|";
                        }
                        $str .= $this->GlyphClassBases;
                }
                if ($str) {
                        // This originally returned e.g. ((?:(?:[IGNORE8]))*) when NOT specific to a Lookup e.g. rtlSub in
                        // arabictypesetting.GSUB.arab.DFLT.php
                        // This would save repeatedly saving long text strings if used multiple times
                        // When writing e.g. arabictypesetting.GSUB.arab.DFLT.php to file, included as $ignore[8]
                        // Would need to also write the $ignore array to that file
                        //              // If UseMarkFilteringSet (specific to the Lookup) return the string
                        //              if (($flag & 0x0010) && ($flag & 0x0008) != 0x0008) {
                        //                      return "((?:(?:" . $str . "))*)";
                        //              }
                        //              else { return "((?:(?:" . "[IGNORE".$ignoreflag."]" . "))*)"; }
                        //              // e.g. ((?:(?: 0031| 0032| 0033| 0034| 0045))*)
                        // But never finished coding it to add the $ignore array to the file, and it doesn't seem to occur often enough to be worth
                        // writing. So just output it as a string:
                        return "((?:(?:" . $str . "))*)";
                } else {
                        return "()";
                }
        }

        // GSUB Patterns

        /*
          BACKTRACK                        INPUT                   LOOKAHEAD
          ==================================  ==================  ==================================
          (FEEB|FEEC)(ign) ¦(FD12|FD13)(ign) ¦(0612)¦(ign) (0613)¦(ign) (FD12|FD13)¦(ign) (FEEB|FEEC)
          ----------------  ----------------  -----  ------------  ---------------   ---------------
          Backtrack 1       Backtrack 2     Input 1   Input 2       Lookahead 1      Lookahead 2
          --------   ---    ---------  ---    ----   ---   ----   ---   ---------   ---    -------
          \${1}  \${2}     \${3}   \${4}                      \${5+}  \${6+}    \${7+}  \${8+}

          nBacktrack = 2               nInput = 2                 nLookahead = 2

          nBsubs = 2xnBack          nIsubs = (nBsubs+)    nLsubs = (nBsubs+nIsubs+) 2xnLookahead
          "\${1}\${2} "                 (nInput*2)-1               "\${5+} \${6+}"
          "REPL"

          ¦\${1}\${2} ¦\${3}\${4} ¦REPL¦\${5+} \${6+}¦\${7+} \${8+}¦


          INPUT nInput = 5
          ============================================================
          ¦(0612)¦(ign) (0613)¦(ign) (0614)¦(ign) (0615)¦(ign) (0615)¦
          \${1}  \${2}  \${3}  \${4} \${5} \${6}  \${7} \${8}  \${9} (All backreference numbers are + nBsubs)
          -----  ------------ ------------ ------------ ------------
          Input 1   Input 2      Input 3      Input 4      Input 5

          A======  SequenceIndex=1 ; Lookup match nGlyphs=1
          B===================  SequenceIndex=1 ; Lookup match nGlyphs=2
          C===============================  SequenceIndex=1 ; Lookup match nGlyphs=3
          D=======================  SequenceIndex=2 ; Lookup match nGlyphs=2
          E=====================================  SequenceIndex=2 ; Lookup match nGlyphs=3
          F======================  SequenceIndex=4 ; Lookup match nGlyphs=2

          All backreference numbers are + nBsubs
          A - "REPL\${2} \${3}\${4} \${5}\${6} \${7}\${8} \${9}"
          B - "REPL\${2}\${4} \${5}\${6} \${7}\${8} \${9}"
          C - "REPL\${2}\${4}\${6} \${7}\${8} \${9}"
          D - "\${1} REPL\${2}\${4}\${6} \${7}\${8} \${9}"
          E - "\${1} REPL\${2}\${4}\${6}\${8} \${9}"
          F - "\${1}\${2} \${3}\${4} \${5} REPL\${6}\${8}"
         */

        function _makeGSUBcontextInputMatch($inputGlyphs, $ignore, $lookupGlyphs, $seqIndex)
        {
                // $ignore = "((?:(?: FBA1| FBA2| FBA3))*)" or "()"
                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                // $inputGlyphs = array of glyphs(glyphstrings) making up Input sequence in Context
                // $lookupGlyphs = array of glyphs (single Glyphs) making up Lookup Input sequence
                $mLen = count($lookupGlyphs); // nGlyphs in the secondary Lookup match
                $nInput = count($inputGlyphs); // nGlyphs in the Primary Input sequence
                $str = "";
                for ($i = 0; $i < $nInput; $i++) {
                        if ($i > 0) {
                                $str .= $ignore . " ";
                        }
                        if ($i >= $seqIndex && $i < ($seqIndex + $mLen)) {
                                $str .= "(" . $lookupGlyphs[($i - $seqIndex)] . ")";
                        } else {
                                $str .= "(" . $inputGlyphs[($i)] . ")";
                        }
                }

                return $str;
        }

        function _makeGSUBinputMatch($inputGlyphs, $ignore)
        {
                // $ignore = "((?:(?: FBA1| FBA2| FBA3))*)" or "()"
                // Returns e.g. ¦(0612)¦(ignore) (0613)¦(ignore) (0614)¦
                // $inputGlyphs = array of glyphs(glyphstrings) making up Input sequence in Context
                // $lookupGlyphs = array of glyphs making up Lookup Input sequence - if applicable
                $str = "";
                for ($i = 1; $i <= count($inputGlyphs); $i++) {
                        if ($i > 1) {
                                $str .= $ignore . " ";
                        }
                        $str .= "(" . $inputGlyphs[($i - 1)] . ")";
                }

                return $str;
        }

        function _makeGSUBbacktrackMatch($backtrackGlyphs, $ignore)
        {
                // $ignore = "((?:(?: FBA1| FBA2| FBA3))*)" or "()"
                // Returns e.g. ¦(FEEB|FEEC)(ignore) ¦(FD12|FD13)(ignore) ¦
                // $backtrackGlyphs = array of glyphstrings making up Backtrack sequence
                // 3  2  1  0
                // each item being e.g. E0AD|E0AF|F1FD
                $str = "";
                for ($i = (count($backtrackGlyphs) - 1); $i >= 0; $i--) {
                        $str .= "(" . $backtrackGlyphs[$i] . ")" . $ignore . " ";
                }

                return $str;
        }

        function _makeGSUBlookaheadMatch($lookaheadGlyphs, $ignore)
        {
                // $ignore = "((?:(?: FBA1| FBA2| FBA3))*)" or "()"
                // Returns e.g. ¦(ignore) (FD12|FD13)¦(ignore) (FEEB|FEEC)¦
                // $lookaheadGlyphs = array of glyphstrings making up Lookahead sequence
                // 0  1  2  3
                // each item being e.g. E0AD|E0AF|F1FD
                $str = "";
                for ($i = 0; $i < count($lookaheadGlyphs); $i++) {
                        $str .= $ignore . " (" . $lookaheadGlyphs[$i] . ")";
                }

                return $str;
        }

        function _makeGSUBinputReplacement($nInput, $REPL, $ignore, $nBsubs, $mLen, $seqIndex)
        {
                // Returns e.g. "REPL\${6}\${8}" or "\${1}\${2} \${3} REPL\${4}\${6}\${8} \${9}"
                // $nInput      nGlyphs in the Primary Input sequence
                // $REPL        replacement glyphs from secondary lookup
                // $ignore = "((?:(?: FBA1| FBA2| FBA3))*)" or "()"
                // $nBsubs      Number of Backtrack substitutions (= 2x Number of Backtrack glyphs)
                // $mLen        nGlyphs in the secondary Lookup match - if no secondary lookup, should=$nInput
                // $seqIndex    Sequence Index to apply the secondary match
                if ($ignore == "()") {
                        $ign = false;
                } else {
                        $ign = true;
                }
                $str = "";
                if ($nInput == 1) {
                        $str = $REPL;
                } else if ($nInput > 1) {
                        if ($mLen == $nInput) { // whole string replaced
                                $str = $REPL;
                                if ($ign) {
                                        // for every nInput over 1, add another replacement backreference, to move IGNORES after replacement
                                        for ($x = 2; $x <= $nInput; $x++) {
                                                $str .= '\\' . ($nBsubs + (2 * ($x - 1)));
                                        }
                                }
                        } else { // if only part of string replaced:
                                for ($x = 1; $x < ($seqIndex + 1); $x++) {
                                        if ($x == 1) {
                                                $str .= '\\' . ($nBsubs + 1);
                                        } else {
                                                if ($ign) {
                                                        $str .= '\\' . ($nBsubs + (2 * ($x - 1)));
                                                }
                                                $str .= ' \\' . ($nBsubs + 1 + (2 * ($x - 1)));
                                        }
                                }
                                if ($seqIndex > 0) {
                                        $str .= " ";
                                }
                                $str .= $REPL;
                                if ($ign) {
                                        for ($x = (max(($seqIndex + 1), 2)); $x < ($seqIndex + 1 + $mLen); $x++) { //  move IGNORES after replacement
                                                $str .= '\\' . ($nBsubs + (2 * ($x - 1)));
                                        }
                                }
                                for ($x = ($seqIndex + 1 + $mLen); $x <= $nInput; $x++) {
                                        if ($ign) {
                                                $str .= '\\' . ($nBsubs + (2 * ($x - 1)));
                                        }
                                        $str .= ' \\' . ($nBsubs + 1 + (2 * ($x - 1)));
                                }
                        }
                }

                return $str;
        }

        //////////////////////////////////////////////////////////////////////////////////
        function _getCoverage($convert2hex = true, $mode = 1)
        {
                $g = [];
                $ctr = 0;
                $CoverageFormat = $this->read_ushort();
                if ($CoverageFormat == 1) {
                        $CoverageGlyphCount = $this->read_ushort();
                        for ($gid = 0; $gid < $CoverageGlyphCount; $gid++) {
                                $glyphID = $this->read_ushort();
                                $uni = $this->glyphToChar[$glyphID][0];
                                if ($convert2hex) {
                                        $g[] = unicode_hex($uni);
                                } else if ($mode == 2) {
                                        $g[$uni] = $ctr;
                                        $ctr++;
                                } else {
                                        $g[] = $glyphID;
                                }
                        }
                }
                if ($CoverageFormat == 2) {
                        $RangeCount = $this->read_ushort();
                        for ($r = 0; $r < $RangeCount; $r++) {
                                $start = $this->read_ushort();
                                $end = $this->read_ushort();
                                $StartCoverageIndex = $this->read_ushort(); // n/a
                                for ($glyphID = $start; $glyphID <= $end; $glyphID++) {
                                        $uni = $this->glyphToChar[$glyphID][0];
                                        if ($convert2hex) {
                                                $g[] = unicode_hex($uni);
                                        } else if ($mode == 2) {
                                                $uni = $g[$uni] = $ctr;
                                                $ctr++;
                                        } else {
                                                $g[] = $glyphID;
                                        }
                                }
                        }
                }

                return $g;
        }

        //////////////////////////////////////////////////////////////////////////////////
        function _getClasses($offset)
        {
                $this->seek($offset);
                $ClassFormat = $this->read_ushort();
                $GlyphByClass = [];
                if ($ClassFormat == 1) {
                        $StartGlyph = $this->read_ushort();
                        $GlyphCount = $this->read_ushort();
                        for ($i = 0; $i < $GlyphCount; $i++) {
                                $startGlyphID = $StartGlyph + $i;
                                $endGlyphID = $StartGlyph + $i;
                                $class = $this->read_ushort();
                                for ($g = $startGlyphID; $g <= $endGlyphID; $g++) {
                                        if (isset($this->glyphToChar[$g][0])) {
                                                $GlyphByClass[$class][] = unicode_hex($this->glyphToChar[$g][0]);
                                        }
                                }
                        }
                } else if ($ClassFormat == 2) {
                        $tableCount = $this->read_ushort();
                        for ($i = 0; $i < $tableCount; $i++) {
                                $startGlyphID = $this->read_ushort();
                                $endGlyphID = $this->read_ushort();
                                $class = $this->read_ushort();
                                for ($g = $startGlyphID; $g <= $endGlyphID; $g++) {
                                        if ($this->glyphToChar[$g][0]) {
                                                $GlyphByClass[$class][] = unicode_hex($this->glyphToChar[$g][0]);
                                        }
                                }
                        }
                }
                $gbc = [];
                foreach ($GlyphByClass as $class => $garr) {
                        $gbc[$class] = implode('|', $garr);
                }

                return $gbc;
        }

        //////////////////////////////////////////////////////////////////////////////////
        //////////////////////////////////////////////////////////////////////////////////
        //////////////////////////////////////////////////////////////////////////////////
        //////////////////////////////////////////////////////////////////////////////////
        //////////////////////////////////////////////////////////////////////////////////
        function _getGPOStables()
        {
                ///////////////////////////////////
                // GPOS - Glyph Positioning
                ///////////////////////////////////
                if (isset($this->tables["GPOS"])) {
                        $ffeats = [];
                        $gpos_offset = $this->seek_table("GPOS");
                        $this->skip(4);
                        $ScriptList_offset = $gpos_offset + $this->read_ushort();
                        $FeatureList_offset = $gpos_offset + $this->read_ushort();
                        $LookupList_offset = $gpos_offset + $this->read_ushort();

                        // ScriptList
                        $this->seek($ScriptList_offset);
                        $ScriptCount = $this->read_ushort();
                        for ($i = 0; $i < $ScriptCount; $i++) {
                                $ScriptTag = $this->read_tag(); // = "beng", "deva" etc.
                                $ScriptTableOffset = $this->read_ushort();
                                $ffeats[$ScriptTag] = $ScriptList_offset + $ScriptTableOffset;
                        }

                        // Script Table
                        foreach ($ffeats as $t => $o) {
                                $ls = [];
                                $this->seek($o);
                                $DefLangSys_offset = $this->read_ushort();
                                if ($DefLangSys_offset > 0) {
                                        $ls['DFLT'] = $DefLangSys_offset + $o;
                                }
                                $LangSysCount = $this->read_ushort();
                                for ($i = 0; $i < $LangSysCount; $i++) {
                                        $LangTag = $this->read_tag(); // =
                                        $LangTableOffset = $this->read_ushort();
                                        $ls[$LangTag] = $o + $LangTableOffset;
                                }
                                $ffeats[$t] = $ls;
                        }

                        // Get FeatureIndexList
                        // LangSys Table - from first listed langsys
                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $o) {
                                        $FeatureIndex = [];
                                        $langsystable_offset = $o;
                                        $this->seek($langsystable_offset);
                                        $LookUpOrder = $this->read_ushort(); //==NULL
                                        $ReqFeatureIndex = $this->read_ushort();
                                        if ($ReqFeatureIndex != 0xFFFF) {
                                                $FeatureIndex[] = $ReqFeatureIndex;
                                        }
                                        $FeatureCount = $this->read_ushort();
                                        for ($i = 0; $i < $FeatureCount; $i++) {
                                                $FeatureIndex[] = $this->read_ushort(); // = index of feature
                                        }
                                        $ffeats[$st][$t] = $FeatureIndex;
                                }
                        }
//print_r($ffeats); exit;
                        // Feauture List => LookupListIndex es
                        $this->seek($FeatureList_offset);
                        $FeatureCount = $this->read_ushort();
                        $Feature = [];
                        for ($i = 0; $i < $FeatureCount; $i++) {
                                $tag = $this->read_tag();
                                if ($tag == 'kern') {
                                        $this->haskernGPOS = true;
                                }
                                $Feature[$i] = ['tag' => $tag];
                                $Feature[$i]['offset'] = $FeatureList_offset + $this->read_ushort();
                        }
                        for ($i = 0; $i < $FeatureCount; $i++) {
                                $this->seek($Feature[$i]['offset']);
                                $this->read_ushort(); // null
                                $Feature[$i]['LookupCount'] = $Lookupcount = $this->read_ushort();
                                $Feature[$i]['LookupListIndex'] = [];
                                for ($c = 0; $c < $Lookupcount; $c++) {
                                        $Feature[$i]['LookupListIndex'][] = $this->read_ushort();
                                }
                        }

                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $o) {
                                        $FeatureIndex = $ffeats[$st][$t];
                                        foreach ($FeatureIndex as $k => $fi) {
                                                $ffeats[$st][$t][$k] = $Feature[$fi];
                                        }
                                }
                        }
//print_r($ffeats); exit;
                        //=====================================================================================
                        $gpos = [];
                        $GPOSScriptLang = [];
                        foreach ($ffeats as $st => $scripts) {
                                foreach ($scripts as $t => $langsys) {
                                        $lg = [];
                                        foreach ($langsys as $ft) {
                                                $lg[$ft['LookupListIndex'][0]] = $ft;
                                        }
                                        // list of Lookups in order they need to be run i.e. order listed in Lookup table
                                        ksort($lg);
                                        foreach ($lg as $ft) {
                                                $gpos[$st][$t][$ft['tag']] = $ft['LookupListIndex'];
                                        }
                                        if (!isset($GPOSScriptLang[$st])) {
                                                $GPOSScriptLang[$st] = '';
                                        }
                                        $GPOSScriptLang[$st] .= $t . ' ';
                                }
                        }

                        //=====================================================================================
                        // Get metadata and offsets for whole Lookup List table
                        $this->seek($LookupList_offset);
                        $LookupCount = $this->read_ushort();
                        $Lookup = [];
                        $Offsets = [];
                        $SubtableCount = [];
                        for ($i = 0; $i < $LookupCount; $i++) {
                                $Offsets[$i] = $LookupList_offset + $this->read_ushort();
                        }
                        for ($i = 0; $i < $LookupCount; $i++) {
                                $this->seek($Offsets[$i]);
                                $Lookup[$i]['Type'] = $this->read_ushort();
                                $Lookup[$i]['Flag'] = $flag = $this->read_ushort();
                                $Lookup[$i]['SubtableCount'] = $SubtableCount[$i] = $this->read_ushort();
                                for ($c = 0; $c < $SubtableCount[$i]; $c++) {
                                        $Lookup[$i]['Subtables'][$c] = $Offsets[$i] + $this->read_ushort();
                                }
                                // MarkFilteringSet = Index (base 0) into GDEF mark glyph sets structure
                                if (($flag & 0x0010) == 0x0010) {
                                        $Lookup[$i]['MarkFilteringSet'] = $this->read_ushort();
                                } else {
                                        $Lookup[$i]['MarkFilteringSet'] = '';
                                }

                                // Lookup Type 9: Extension
                                if ($Lookup[$i]['Type'] == 9) {
                                        // Overwrites new offset (32-bit) for each subtable, and a new lookup Type
                                        for ($c = 0; $c < $SubtableCount[$i]; $c++) {
                                                $this->seek($Lookup[$i]['Subtables'][$c]);
                                                $ExtensionPosFormat = $this->read_ushort();
                                                $type = $this->read_ushort();
                                                $Lookup[$i]['Subtables'][$c] = $Lookup[$i]['Subtables'][$c] + $this->read_ulong();
                                        }
                                        $Lookup[$i]['Type'] = $type;
                                }
                        }

                        //=====================================================================================
                        // Process Whole LookupList - Get LuCoverage = Lookup coverage just for first glyph
                        $this->LuCoverage = [];
                        for ($i = 0; $i < $LookupCount; $i++) {
                                for ($c = 0; $c < $Lookup[$i]['SubtableCount']; $c++) {
                                        $this->seek($Lookup[$i]['Subtables'][$c]);
                                        $PosFormat = $this->read_ushort();

                                        if ($Lookup[$i]['Type'] == 7 && $PosFormat == 3) {
                                                $this->skip(4);
                                        } else if ($Lookup[$i]['Type'] == 8 && $PosFormat == 3) {
                                                $BacktrackGlyphCount = $this->read_ushort();
                                                $this->skip(2 * $BacktrackGlyphCount + 2);
                                        }
                                        // NB Coverage only looks at glyphs for position 1 (i.e. 7.3 and 8.3)   // NEEDS TO READ ALL ********************
                                        // NB For e.g. Type 4, this may be the Coverage for the Mark
                                        $Coverage = $Lookup[$i]['Subtables'][$c] + $this->read_ushort();
                                        $this->seek($Coverage);
                                        $glyphs = $this->_getCoverage(false, 2);
                                        $this->LuCoverage[$i][$c] = $glyphs;
                                }
                        }

                        //=====================================================================================
//print_r($GPOSScriptLang); exit;
//print_r($gpos); exit;
//print_r($Lookup); exit;

                        $s = '<?php
$LuCoverage = ' . var_export($this->LuCoverage, true) . ';
?>';

                        $this->fontCache->write($this->fontkey . '.GPOSdata.php', $s);

                        return [$GPOSScriptLang, $gpos, $Lookup];
                } // end if GPOS
        }

        //////////////////////////////////////////////////////////////////////////////////
        //=====================================================================================
        //=====================================================================================
        //=====================================================================================
        //=====================================================================================
        //=====================================================================================
        //=====================================================================================

        function makeSubset($file, &$subset, $TTCfontID = 0, $debug = false, $useOTL = false)
        {
        // mPDF 5.7.1
                $this->useOTL = $useOTL; // mPDF 5.7.1
                $this->filename = $file;
                $this->fh = fopen($file, 'rb');

                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('Can\'t open file ' . $file);
                }

                $this->_pos = 0;
                $this->charWidths = '';
                $this->glyphPos = [];
                $this->charToGlyph = [];
                $this->tables = [];
                $this->otables = [];
                $this->ascent = 0;
                $this->descent = 0;
                $this->strikeoutSize = 0;
                $this->strikeoutPosition = 0;
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->skip(4);
                $this->maxUni = 0;
                if ($TTCfontID > 0) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                        $this->numTTCFonts = $this->read_ulong();
                        for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                                $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                        }
                        $this->seek($this->TTCFonts[$TTCfontID]['offset']);
                        $this->version = $version = $this->read_ulong(); // TTFont version again now
                }
                $this->readTableDirectory($debug);

                ///////////////////////////////////
                // head - Font header table
                ///////////////////////////////////
                $this->seek_table("head");
                $this->skip(50);
                $indexToLocFormat = $this->read_ushort();
                $glyphDataFormat = $this->read_ushort();

                ///////////////////////////////////
                // hhea - Horizontal header table
                ///////////////////////////////////
                $this->seek_table("hhea");
                $this->skip(32);
                $metricDataFormat = $this->read_ushort();
                $orignHmetrics = $numberOfHMetrics = $this->read_ushort();

                ///////////////////////////////////
                // maxp - Maximum profile table
                ///////////////////////////////////
                $this->seek_table("maxp");
                $this->skip(4);
                $numGlyphs = $this->read_ushort();

                ///////////////////////////////////
                // cmap - Character to glyph index mapping table
                ///////////////////////////////////
                $cmap_offset = $this->seek_table("cmap");
                $this->skip(2);
                $cmapTableCount = $this->read_ushort();
                $unicode_cmap_offset = 0;
                for ($i = 0; $i < $cmapTableCount; $i++) {
                        $platformID = $this->read_ushort();
                        $encodingID = $this->read_ushort();
                        $offset = $this->read_ulong();
                        $save_pos = $this->_pos;
                        if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 4) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                        break;
                                }
                        }
                        $this->seek($save_pos);
                }

                if (!$unicode_cmap_offset) {
                        throw new \Mpdf\MpdfException('Font (' . $this->filename . ') does not have Unicode cmap (platform 3, encoding 1, format 4, or platform 0 [any encoding] format 4)');
                }

                $glyphToChar = [];
                $charToGlyph = [];
                $this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph);

                ///////////////////////////////////
                // mPDF 5.7.1
                // Map Unmapped glyphs - from $numGlyphs
                if ($useOTL) {
                        $bctr = 0xE000;
                        for ($gid = 1; $gid < $numGlyphs; $gid++) {
                                if (!isset($glyphToChar[$gid])) {
                                        while (isset($charToGlyph[$bctr])) {
                                                $bctr++;
                                        } // Avoid overwriting a glyph already mapped in PUA
                                        if ($bctr > 0xF8FF) {
                                                throw new \Mpdf\MpdfException($file . " : WARNING - Font cannot map all included glyphs into Private Use Area U+E000 - U+F8FF; cannot use useOTL on this font");
                                        }
                                        $glyphToChar[$gid][] = $bctr;
                                        $charToGlyph[$bctr] = $gid;
                                        $bctr++;
                                }
                        }
                }
                ///////////////////////////////////

                $this->charToGlyph = $charToGlyph;
                $this->glyphToChar = $glyphToChar;

                ///////////////////////////////////
                // hmtx - Horizontal metrics table
                ///////////////////////////////////
                $scale = 1; // not used
                $this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);

                ///////////////////////////////////
                // loca - Index to location
                ///////////////////////////////////
                $this->getLOCA($indexToLocFormat, $numGlyphs);

                $subsetglyphs = [0 => 0, 1 => 1, 2 => 2];
                $subsetCharToGlyph = [];
                foreach ($subset as $code) {
                        if (isset($this->charToGlyph[$code])) {
                                $subsetglyphs[$this->charToGlyph[$code]] = $code; // Old Glyph ID => Unicode
                                $subsetCharToGlyph[$code] = $this->charToGlyph[$code]; // Unicode to old GlyphID
                        }
                        $this->maxUni = max($this->maxUni, $code);
                }

                list($start, $dummy) = $this->get_table_pos('glyf');

                $glyphSet = [];
                ksort($subsetglyphs);
                $n = 0;
                $fsLastCharIndex = 0; // maximum Unicode index (character code) in this font, according to the cmap subtable for platform ID 3 and platform- specific encoding ID 0 or 1.
                foreach ($subsetglyphs as $originalGlyphIdx => $uni) {
                        $fsLastCharIndex = max($fsLastCharIndex, $uni);
                        $glyphSet[$originalGlyphIdx] = $n; // old glyphID to new glyphID
                        $n++;
                }

                ksort($subsetCharToGlyph);
                foreach ($subsetCharToGlyph as $uni => $originalGlyphIdx) {
                        $codeToGlyph[$uni] = $glyphSet[$originalGlyphIdx];
                }
                $this->codeToGlyph = $codeToGlyph;

                ksort($subsetglyphs);
                foreach ($subsetglyphs as $originalGlyphIdx => $uni) {
                        $this->getGlyphs($originalGlyphIdx, $start, $glyphSet, $subsetglyphs);
                }

                $numGlyphs = $numberOfHMetrics = count($subsetglyphs);

                ///////////////////////////////////
                // name - table copied from the original
                ///////////////////////////////////
                // MS spec says that "Platform and encoding ID's in the name table should be consistent with those in the cmap table.
                // If they are not, the font will not load in Windows"
                // Doesn't seem to be a problem?
                ///////////////////////////////////
                $this->add('name', $this->get_table('name'));

                ///////////////////////////////////
                //tables copied from the original
                ///////////////////////////////////
                $tags = ['cvt ', 'fpgm', 'prep', 'gasp'];
                foreach ($tags as $tag) {
                        if (isset($this->tables[$tag])) {
                                $this->add($tag, $this->get_table($tag));
                        }
                }

                ///////////////////////////////////
                // post - PostScript
                ///////////////////////////////////
                if (isset($this->tables['post'])) {
                        $opost = $this->get_table('post');
                        $post = "\x00\x03\x00\x00" . substr($opost, 4, 12) . "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
                        $this->add('post', $post);
                }

                ///////////////////////////////////
                // Sort CID2GID map into segments of contiguous codes
                ///////////////////////////////////
                ksort($codeToGlyph);
                unset($codeToGlyph[0]);
                //unset($codeToGlyph[65535]);
                $rangeid = 0;
                $range = [];
                $prevcid = -2;
                $prevglidx = -1;
                // for each character
                foreach ($codeToGlyph as $cid => $glidx) {
                        if ($cid == ($prevcid + 1) && $glidx == ($prevglidx + 1)) {
                                $range[$rangeid][] = $glidx;
                        } else {
                                // new range
                                $rangeid = $cid;
                                $range[$rangeid] = [];
                                $range[$rangeid][] = $glidx;
                        }
                        $prevcid = $cid;
                        $prevglidx = $glidx;
                }

                ///////////////////////////////////
                // CMap table
                ///////////////////////////////////
                // cmap - Character to glyph mapping
                $segCount = count($range) + 1; // + 1 Last segment has missing character 0xFFFF
                $searchRange = 1;
                $entrySelector = 0;
                while ($searchRange * 2 <= $segCount) {
                        $searchRange = $searchRange * 2;
                        $entrySelector = $entrySelector + 1;
                }
                $searchRange = $searchRange * 2;
                $rangeShift = $segCount * 2 - $searchRange;
                $length = 16 + (8 * $segCount) + ($numGlyphs + 1);
                $cmap = [0, 3, // Index : version, number of encoding subtables
                        0, 0, // Encoding Subtable : platform (UNI=0), encoding 0
                        0, 28, // Encoding Subtable : offset (hi,lo)
                        0, 3, // Encoding Subtable : platform (UNI=0), encoding 3
                        0, 28, // Encoding Subtable : offset (hi,lo)
                        3, 1, // Encoding Subtable : platform (MS=3), encoding 1
                        0, 28, // Encoding Subtable : offset (hi,lo)
                        4, $length, 0, // Format 4 Mapping subtable: format, length, language
                        $segCount * 2,
                        $searchRange,
                        $entrySelector,
                        $rangeShift];

                // endCode(s)
                foreach ($range as $start => $subrange) {
                        $endCode = $start + (count($subrange) - 1);
                        $cmap[] = $endCode; // endCode(s)
                }
                $cmap[] = 0xFFFF; // endCode of last Segment
                $cmap[] = 0; // reservedPad
                // startCode(s)
                foreach ($range as $start => $subrange) {
                        $cmap[] = $start; // startCode(s)
                }
                $cmap[] = 0xFFFF; // startCode of last Segment
                // idDelta(s)
                foreach ($range as $start => $subrange) {
                        $idDelta = -($start - $subrange[0]);
                        $n += count($subrange);
                        $cmap[] = $idDelta; // idDelta(s)
                }
                $cmap[] = 1; // idDelta of last Segment
                // idRangeOffset(s)
                foreach ($range as $subrange) {
                        $cmap[] = 0; // idRangeOffset[segCount]         Offset in bytes to glyph indexArray, or 0
                }
                $cmap[] = 0; // idRangeOffset of last Segment
                foreach ($range as $subrange) {
                        foreach ($subrange as $glidx) {
                                $cmap[] = $glidx;
                        }
                }
                $cmap[] = 0; // Mapping for last character
                $cmapstr = '';
                foreach ($cmap as $cm) {
                        $cmapstr .= pack("n", $cm);
                }
                $this->add('cmap', $cmapstr);

                ///////////////////////////////////
                // glyf - Glyph data
                ///////////////////////////////////
                list($glyfOffset, $glyfLength) = $this->get_table_pos('glyf');
                if ($glyfLength < $this->maxStrLenRead) {
                        $glyphData = $this->get_table('glyf');
                }

                $offsets = [];
                $glyf = '';
                $pos = 0;
                $hmtxstr = '';
                $xMinT = 0;
                $yMinT = 0;
                $xMaxT = 0;
                $yMaxT = 0;
                $advanceWidthMax = 0;
                $minLeftSideBearing = 0;
                $minRightSideBearing = 0;
                $xMaxExtent = 0;
                $maxPoints = 0; // points in non-compound glyph
                $maxContours = 0; // contours in non-compound glyph
                $maxComponentPoints = 0; // points in compound glyph
                $maxComponentContours = 0; // contours in compound glyph
                $maxComponentElements = 0; // number of glyphs referenced at top level
                $maxComponentDepth = 0; // levels of recursion, set to 0 if font has only simple glyphs
                $this->glyphdata = [];

                foreach ($subsetglyphs as $originalGlyphIdx => $uni) {
                        // hmtx - Horizontal Metrics
                        $hm = $this->getHMetric($orignHmetrics, $originalGlyphIdx);
                        $hmtxstr .= $hm;

                        $offsets[] = $pos;
                        $glyphPos = $this->glyphPos[$originalGlyphIdx];
                        $glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
                        if ($glyfLength < $this->maxStrLenRead) {
                                $data = substr($glyphData, $glyphPos, $glyphLen);
                        } else {
                                if ($glyphLen > 0) {
                                        $data = $this->get_chunk($glyfOffset + $glyphPos, $glyphLen);
                                } else {
                                        $data = '';
                                }
                        }

                        if ($glyphLen > 0) {
                                if (_RECALC_PROFILE) {
                                        $xMin = $this->unpack_short(substr($data, 2, 2));
                                        $yMin = $this->unpack_short(substr($data, 4, 2));
                                        $xMax = $this->unpack_short(substr($data, 6, 2));
                                        $yMax = $this->unpack_short(substr($data, 8, 2));
                                        $xMinT = min($xMinT, $xMin);
                                        $yMinT = min($yMinT, $yMin);
                                        $xMaxT = max($xMaxT, $xMax);
                                        $yMaxT = max($yMaxT, $yMax);
                                        $aw = $this->unpack_short(substr($hm, 0, 2));
                                        $lsb = $this->unpack_short(substr($hm, 2, 2));
                                        $advanceWidthMax = max($advanceWidthMax, $aw);
                                        $minLeftSideBearing = min($minLeftSideBearing, $lsb);
                                        $minRightSideBearing = min($minRightSideBearing, ($aw - $lsb - ($xMax - $xMin)));
                                        $xMaxExtent = max($xMaxExtent, ($lsb + ($xMax - $xMin)));
                                }
                                $up = unpack("n", substr($data, 0, 2));
                        }
                        if ($glyphLen > 2 && ($up[1] & (1 << 15))) { // If number of contours <= -1 i.e. composiste glyph
                                $pos_in_glyph = 10;
                                $flags = GlyphOperator::MORE;
                                $nComponentElements = 0;
                                while ($flags & GlyphOperator::MORE) {
                                        $nComponentElements += 1; // number of glyphs referenced at top level
                                        $up = unpack("n", substr($data, $pos_in_glyph, 2));
                                        $flags = $up[1];
                                        $up = unpack("n", substr($data, $pos_in_glyph + 2, 2));
                                        $glyphIdx = $up[1];
                                        $this->glyphdata[$originalGlyphIdx]['compGlyphs'][] = $glyphIdx;
                                        $data = $this->_set_ushort($data, $pos_in_glyph + 2, $glyphSet[$glyphIdx]);
                                        $pos_in_glyph += 4;
                                        if ($flags & GlyphOperator::WORDS) {
                                                $pos_in_glyph += 4;
                                        } else {
                                                $pos_in_glyph += 2;
                                        }
                                        if ($flags & GlyphOperator::SCALE) {
                                                $pos_in_glyph += 2;
                                        } else if ($flags & GlyphOperator::XYSCALE) {
                                                $pos_in_glyph += 4;
                                        } else if ($flags & GlyphOperator::TWOBYTWO) {
                                                $pos_in_glyph += 8;
                                        }
                                }
                                $maxComponentElements = max($maxComponentElements, $nComponentElements);
                        } // Simple Glyph
                        else if (_RECALC_PROFILE && $glyphLen > 2 && $up[1] < (1 << 15) && $up[1] > 0) {  // Number of contours > 0 simple glyph
                                $nContours = $up[1];
                                $this->glyphdata[$originalGlyphIdx]['nContours'] = $nContours;
                                $maxContours = max($maxContours, $nContours);

                                // Count number of points in simple glyph
                                $pos_in_glyph = 10 + ($nContours * 2) - 2; // Last endContourPoint
                                $up = unpack("n", substr($data, $pos_in_glyph, 2));
                                $points = $up[1] + 1;
                                $this->glyphdata[$originalGlyphIdx]['nPoints'] = $points;
                                $maxPoints = max($maxPoints, $points);
                        }

                        $glyf .= $data;
                        $pos += $glyphLen;
                        if ($pos % 4 != 0) {
                                $padding = 4 - ($pos % 4);
                                $glyf .= str_repeat("\0", $padding);
                                $pos += $padding;
                        }
                }

                if (_RECALC_PROFILE) {
                        foreach ($this->glyphdata as $originalGlyphIdx => $val) {
                                $maxdepth = $depth = -1;
                                $points = 0;
                                $contours = 0;
                                $this->getGlyphData($originalGlyphIdx, $maxdepth, $depth, $points, $contours);
                                $maxComponentDepth = max($maxComponentDepth, $maxdepth);
                                $maxComponentPoints = max($maxComponentPoints, $points);
                                $maxComponentContours = max($maxComponentContours, $contours);
                        }
                }

                $offsets[] = $pos;
                $this->add('glyf', $glyf);

                ///////////////////////////////////
                // hmtx - Horizontal Metrics
                ///////////////////////////////////
                $this->add('hmtx', $hmtxstr);

                ///////////////////////////////////
                // loca - Index to location
                ///////////////////////////////////
                $locastr = '';
                if ((($pos + 1) >> 1) > 0xFFFF) {
                        $indexToLocFormat = 1;        // long format
                        foreach ($offsets as $offset) {
                                $locastr .= pack("N", $offset);
                        }
                } else {
                        $indexToLocFormat = 0;        // short format
                        foreach ($offsets as $offset) {
                                $locastr .= pack("n", ($offset / 2));
                        }
                }
                $this->add('loca', $locastr);

                ///////////////////////////////////
                // head - Font header
                ///////////////////////////////////
                $head = $this->get_table('head');
                $head = $this->_set_ushort($head, 50, $indexToLocFormat);
                if (_RECALC_PROFILE) {
                        $head = $this->_set_short($head, 36, $xMinT); // for all glyph bounding boxes
                        $head = $this->_set_short($head, 38, $yMinT); // for all glyph bounding boxes
                        $head = $this->_set_short($head, 40, $xMaxT); // for all glyph bounding boxes
                        $head = $this->_set_short($head, 42, $yMaxT); // for all glyph bounding boxes
                        $head[17] = chr($head[17] & ~(1 << 4)); // Unset Bit 4 (as hdmx/LTSH tables not included)
                }
                $this->add('head', $head);

                ///////////////////////////////////
                // hhea - Horizontal Header
                ///////////////////////////////////
                $hhea = $this->get_table('hhea');
                $hhea = $this->_set_ushort($hhea, 34, $numberOfHMetrics);
                if (_RECALC_PROFILE) {
                        $hhea = $this->_set_ushort($hhea, 10, $advanceWidthMax);
                        $hhea = $this->_set_short($hhea, 12, $minLeftSideBearing);
                        $hhea = $this->_set_short($hhea, 14, $minRightSideBearing);
                        $hhea = $this->_set_short($hhea, 16, $xMaxExtent);
                }
                $this->add('hhea', $hhea);

                ///////////////////////////////////
                // maxp - Maximum Profile
                ///////////////////////////////////
                $maxp = $this->get_table('maxp');
                $maxp = $this->_set_ushort($maxp, 4, $numGlyphs);
                if (_RECALC_PROFILE) {
                        $maxp = $this->_set_ushort($maxp, 6, $maxPoints); // points in non-compound glyph
                        $maxp = $this->_set_ushort($maxp, 8, $maxContours); // contours in non-compound glyph
                        $maxp = $this->_set_ushort($maxp, 10, $maxComponentPoints); // points in compound glyph
                        $maxp = $this->_set_ushort($maxp, 12, $maxComponentContours); // contours in compound glyph
                        $maxp = $this->_set_ushort($maxp, 28, $maxComponentElements); // number of glyphs referenced at top level
                        $maxp = $this->_set_ushort($maxp, 30, $maxComponentDepth); // levels of recursion, set to 0 if font has only simple glyphs
                }
                $this->add('maxp', $maxp);

                ///////////////////////////////////
                // OS/2 - OS/2
                ///////////////////////////////////
                if (isset($this->tables['OS/2'])) {
                        $os2_offset = $this->seek_table("OS/2");
                        if (_RECALC_PROFILE) {
                                $fsSelection = $this->get_ushort($os2_offset + 62);
                                $fsSelection = ($fsSelection & ~(1 << 6)); // 2-byte bit field containing information concerning the nature of the font patterns
                                // bit#0 = Italic; bit#5=Bold
                                // Match name table's font subfamily string
                                // Clear bit#6 used for 'Regular' and optional
                        }

                        // NB Currently this method never subsets characters above BMP
                        // Could set nonBMP bit according to $this->maxUni
                        $nonBMP = $this->get_ushort($os2_offset + 46);
                        $nonBMP = ($nonBMP & ~(1 << 9)); // Unset Bit 57 (indicates non-BMP) - for interactive forms

                        $os2 = $this->get_table('OS/2');
                        if (_RECALC_PROFILE) {
                                $os2 = $this->_set_ushort($os2, 62, $fsSelection);
                                $os2 = $this->_set_ushort($os2, 66, $fsLastCharIndex);
                                $os2 = $this->_set_ushort($os2, 42, 0x0000); // ulCharRange (ulUnicodeRange) bits 24-31 | 16-23
                                $os2 = $this->_set_ushort($os2, 44, 0x0000); // ulCharRange (Unicode ranges) bits  8-15 |  0-7
                                $os2 = $this->_set_ushort($os2, 46, $nonBMP); // ulCharRange (Unicode ranges) bits 56-63 | 48-55
                                $os2 = $this->_set_ushort($os2, 48, 0x0000); // ulCharRange (Unicode ranges) bits 40-47 | 32-39
                                $os2 = $this->_set_ushort($os2, 50, 0x0000); // ulCharRange (Unicode ranges) bits  88-95 | 80-87
                                $os2 = $this->_set_ushort($os2, 52, 0x0000); // ulCharRange (Unicode ranges) bits  72-79 | 64-71
                                $os2 = $this->_set_ushort($os2, 54, 0x0000); // ulCharRange (Unicode ranges) bits  120-127 | 112-119
                                $os2 = $this->_set_ushort($os2, 56, 0x0000); // ulCharRange (Unicode ranges) bits  104-111 | 96-103
                        }
                        $os2 = $this->_set_ushort($os2, 46, $nonBMP); // Unset Bit 57 (indicates non-BMP) - for interactive forms

                        $this->add('OS/2', $os2);
                }

                fclose($this->fh);
                // Put the TTF file together
                $stm = '';
                $this->endTTFile($stm);

                //file_put_contents('testfont.ttf', $stm); exit;
                return $stm;
        }

        //================================================================================
        // Also does SMP
        function makeSubsetSIP($file, &$subset, $TTCfontID = 0, $debug = false, $useOTL = 0)
        {
        // mPDF 5.7.1
                $this->fh = fopen($file, 'rb');

                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('Can\'t open file ' . $file);
                }

                $this->filename = $file;
                $this->_pos = 0;
                $this->useOTL = $useOTL; // mPDF 5.7.1
                $this->charWidths = '';
                $this->glyphPos = [];
                $this->charToGlyph = [];
                $this->tables = [];
                $this->otables = [];
                $this->ascent = 0;
                $this->descent = 0;
                $this->strikeoutSize = 0;
                $this->strikeoutPosition = 0;
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->skip(4);
                if ($TTCfontID > 0) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                        $this->numTTCFonts = $this->read_ulong();
                        for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                                $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                        }
                        $this->seek($this->TTCFonts[$TTCfontID]['offset']);
                        $this->version = $version = $this->read_ulong(); // TTFont version again now
                }
                $this->readTableDirectory($debug);

                ///////////////////////////////////
                // head - Font header table
                ///////////////////////////////////
                $this->seek_table("head");
                $this->skip(50);
                $indexToLocFormat = $this->read_ushort();
                $glyphDataFormat = $this->read_ushort();

                ///////////////////////////////////
                // hhea - Horizontal header table
                ///////////////////////////////////
                $this->seek_table("hhea");
                $this->skip(32);
                $metricDataFormat = $this->read_ushort();
                $orignHmetrics = $numberOfHMetrics = $this->read_ushort();

                ///////////////////////////////////
                // maxp - Maximum profile table
                ///////////////////////////////////
                $this->seek_table("maxp");
                $this->skip(4);
                $numGlyphs = $this->read_ushort();

                ///////////////////////////////////
                // cmap - Character to glyph index mapping table
                ///////////////////////////////////

                $cmap_offset = $this->seek_table("cmap");
                $this->skip(2);
                $cmapTableCount = $this->read_ushort();
                $unicode_cmap_offset = 0;
                for ($i = 0; $i < $cmapTableCount; $i++) {
                        $platformID = $this->read_ushort();
                        $encodingID = $this->read_ushort();
                        $offset = $this->read_ulong();
                        $save_pos = $this->_pos;
                        if (($platformID == 3 && $encodingID == 10) || $platformID == 0) { // Microsoft, Unicode Format 12 table HKCS
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 12) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                        break;
                                }
                        }
                        // mPDF 5.7.1
                        if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
                                $format = $this->get_ushort($cmap_offset + $offset);
                                if ($format == 4) {
                                        $unicode_cmap_offset = $cmap_offset + $offset;
                                }
                        }
                        $this->seek($save_pos);
                }

                if (!$unicode_cmap_offset) {
                        throw new \Mpdf\MpdfException('Font does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 0, any encoding, format 4)');
                }

                // Format 12 CMAP does characters above Unicode BMP i.e. some HKCS characters U+20000 and above
                if ($format == 12) {
                        $this->maxUniChar = 0;
                        $this->seek($unicode_cmap_offset + 4);
                        $length = $this->read_ulong();
                        $limit = $unicode_cmap_offset + $length;
                        $this->skip(4);

                        $nGroups = $this->read_ulong();

                        $glyphToChar = [];
                        $charToGlyph = [];
                        for ($i = 0; $i < $nGroups; $i++) {
                                $startCharCode = $this->read_ulong();
                                $endCharCode = $this->read_ulong();
                                $startGlyphCode = $this->read_ulong();
                                $offset = 0;
                                for ($unichar = $startCharCode; $unichar <= $endCharCode; $unichar++) {
                                        $glyph = $startGlyphCode + $offset;
                                        $offset++;
                                        // ZZZ98
                                        if ($unichar < 0x30000) {
                                                $charToGlyph[$unichar] = $glyph;
                                                $this->maxUniChar = max($unichar, $this->maxUniChar);
                                                $glyphToChar[$glyph][] = $unichar;
                                        }
                                }
                        }
                } // mPDF 5.7.1
                else {
                        $glyphToChar = [];
                        $charToGlyph = [];
                        $this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph);
                }

                ///////////////////////////////////
                // mPDF 5.7.1
                // Map Unmapped glyphs - from $numGlyphs
                if ($useOTL) {
                        $bctr = 0xE000;
                        for ($gid = 1; $gid < $numGlyphs; $gid++) {
                                if (!isset($glyphToChar[$gid])) {
                                        while (isset($charToGlyph[$bctr])) {
                                                $bctr++;
                                        } // Avoid overwriting a glyph already mapped in PUA
                                        // ZZZ98
                                        if ($bctr > 0xF8FF && $bctr < 0x2CEB0) {
                                                $bctr = 0x2CEB0;
                                                while (isset($charToGlyph[$bctr])) {
                                                        $bctr++;
                                                }
                                        }
                                        $glyphToChar[$gid][] = $bctr;
                                        $charToGlyph[$bctr] = $gid;
                                        $this->maxUniChar = max($bctr, $this->maxUniChar);
                                        $bctr++;
                                }
                        }
                }
                ///////////////////////////////////
                ///////////////////////////////////
                // hmtx - Horizontal metrics table
                ///////////////////////////////////
                $scale = 1; // not used here
                $this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);

                ///////////////////////////////////
                // loca - Index to location
                ///////////////////////////////////
                $this->getLOCA($indexToLocFormat, $numGlyphs);

                ///////////////////////////////////////////////////////////////////

                $glyphMap = [0 => 0];
                $glyphSet = [0 => 0];
                $codeToGlyph = [];
                // Set a substitute if ASCII characters do not have glyphs
                if (isset($charToGlyph[0x3F])) {
                        $subs = $charToGlyph[0x3F];
                } // Question mark
                else {
                        $subs = $charToGlyph[32];
                }
                foreach ($subset as $code) {
                        if (isset($charToGlyph[$code])) {
                                $originalGlyphIdx = $charToGlyph[$code];
                        } else if ($code < 128) {
                                $originalGlyphIdx = $subs;
                        } else {
                                $originalGlyphIdx = 0;
                        }
                        if (!isset($glyphSet[$originalGlyphIdx])) {
                                $glyphSet[$originalGlyphIdx] = count($glyphMap);
                                $glyphMap[] = $originalGlyphIdx;
                        }
                        $codeToGlyph[$code] = $glyphSet[$originalGlyphIdx];
                }

                list($start, $dummy) = $this->get_table_pos('glyf');

                $n = 0;
                while ($n < count($glyphMap)) {
                        $originalGlyphIdx = $glyphMap[$n];
                        $glyphPos = $this->glyphPos[$originalGlyphIdx];
                        $glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
                        $n += 1;
                        if (!$glyphLen) {
                                continue;
                        }
                        $this->seek($start + $glyphPos);
                        $numberOfContours = $this->read_short();
                        if ($numberOfContours < 0) {
                                $this->skip(8);
                                $flags = GlyphOperator::MORE;
                                while ($flags & GlyphOperator::MORE) {
                                        $flags = $this->read_ushort();
                                        $glyphIdx = $this->read_ushort();
                                        if (!isset($glyphSet[$glyphIdx])) {
                                                $glyphSet[$glyphIdx] = count($glyphMap);
                                                $glyphMap[] = $glyphIdx;
                                        }
                                        if ($flags & GlyphOperator::WORDS) {
                                                $this->skip(4);
                                        } else {
                                                $this->skip(2);
                                        }
                                        if ($flags & GlyphOperator::SCALE) {
                                                $this->skip(2);
                                        } else if ($flags & GlyphOperator::XYSCALE) {
                                                $this->skip(4);
                                        } else if ($flags & GlyphOperator::TWOBYTWO) {
                                                $this->skip(8);
                                        }
                                }
                        }
                }

                $numGlyphs = $n = count($glyphMap);
                $numberOfHMetrics = $n;

                ///////////////////////////////////
                // name
                ///////////////////////////////////
                // MS spec says that "Platform and encoding ID's in the name table should be consistent with those in the cmap table.
                // If they are not, the font will not load in Windows"
                // Doesn't seem to be a problem?
                ///////////////////////////////////
                // Needs to have a name entry in 3,0 (e.g. symbol) - original font will be 3,1 (i.e. Unicode)
                $name = $this->get_table('name');
                $name_offset = $this->seek_table("name");
                $format = $this->read_ushort();
                $numRecords = $this->read_ushort();
                $string_data_offset = $name_offset + $this->read_ushort();
                for ($i = 0; $i < $numRecords; $i++) {
                        $platformId = $this->read_ushort();
                        $encodingId = $this->read_ushort();
                        if ($platformId == 3 && $encodingId == 1) {
                                $pos = 6 + ($i * 12) + 2;
                                $name = $this->_set_ushort($name, $pos, 0x00); // Change encoding to 3,0 rather than 3,1
                        }
                        $this->skip(8);
                }
                $this->add('name', $name);

                ///////////////////////////////////
                // OS/2
                ///////////////////////////////////
                if (isset($this->tables['OS/2'])) {
                        $os2 = $this->get_table('OS/2');
                        $os2 = $this->_set_ushort($os2, 42, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 44, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 46, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 48, 0x00); // ulCharRange (Unicode ranges)

                        $os2 = $this->_set_ushort($os2, 50, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 52, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 54, 0x00); // ulCharRange (Unicode ranges)
                        $os2 = $this->_set_ushort($os2, 56, 0x00); // ulCharRange (Unicode ranges)
                        // Set Symbol character only in ulCodePageRange
                        $os2 = $this->_set_ushort($os2, 78, 0x8000); // ulCodePageRange = Bit #31 Symbol ****  78 = Bit 16-31
                        $os2 = $this->_set_ushort($os2, 80, 0x0000); // ulCodePageRange = Bit #31 Symbol ****  80 = Bit 0-15
                        $os2 = $this->_set_ushort($os2, 82, 0x0000); // ulCodePageRange = Bit #32- Symbol **** 82 = Bits 48-63
                        $os2 = $this->_set_ushort($os2, 84, 0x0000); // ulCodePageRange = Bit #32- Symbol **** 84 = Bits 32-47

                        $os2 = $this->_set_ushort($os2, 64, 0x01); // FirstCharIndex
                        $os2 = $this->_set_ushort($os2, 66, count($subset)); // LastCharIndex
                        // Set PANOSE first bit to 5 for Symbol
                        $os2 = $this->splice($os2, 32, chr(5) . chr(0) . chr(1) . chr(0) . chr(1) . chr(0) . chr(0) . chr(0) . chr(0) . chr(0));
                        $this->add('OS/2', $os2);
                }

                ///////////////////////////////////
                //tables copied from the original
                ///////////////////////////////////
                $tags = ['cvt ', 'fpgm', 'prep', 'gasp'];
                foreach ($tags as $tag) {  // 1.02
                        if (isset($this->tables[$tag])) {
                                $this->add($tag, $this->get_table($tag));
                        }
                }

                ///////////////////////////////////
                // post - PostScript
                ///////////////////////////////////
                if (isset($this->tables['post'])) {
                        $opost = $this->get_table('post');
                        $post = "\x00\x03\x00\x00" . substr($opost, 4, 12) . "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00";
                }
                $this->add('post', $post);

                ///////////////////////////////////
                // hhea - Horizontal Header
                ///////////////////////////////////
                $hhea = $this->get_table('hhea');
                $hhea = $this->_set_ushort($hhea, 34, $numberOfHMetrics);
                $this->add('hhea', $hhea);

                ///////////////////////////////////
                // maxp - Maximum Profile
                ///////////////////////////////////
                $maxp = $this->get_table('maxp');
                $maxp = $this->_set_ushort($maxp, 4, $numGlyphs);
                $this->add('maxp', $maxp);

                ///////////////////////////////////
                // CMap table Formats [1,0,]6 and [3,0,]4
                ///////////////////////////////////
                ///////////////////////////////////
                // Sort CID2GID map into segments of contiguous codes
                ///////////////////////////////////
                $rangeid = 0;
                $range = [];
                $prevcid = -2;
                $prevglidx = -1;
                // for each character
                foreach ($subset as $cid => $code) {
                        $glidx = $codeToGlyph[$code];
                        if ($cid == ($prevcid + 1) && $glidx == ($prevglidx + 1)) {
                                $range[$rangeid][] = $glidx;
                        } else {
                                // new range
                                $rangeid = $cid;
                                $range[$rangeid] = [];
                                $range[$rangeid][] = $glidx;
                        }
                        $prevcid = $cid;
                        $prevglidx = $glidx;
                }
                // cmap - Character to glyph mapping
                $segCount = count($range) + 1; // + 1 Last segment has missing character 0xFFFF
                $searchRange = 1;
                $entrySelector = 0;
                while ($searchRange * 2 <= $segCount) {
                        $searchRange = $searchRange * 2;
                        $entrySelector = $entrySelector + 1;
                }
                $searchRange = $searchRange * 2;
                $rangeShift = $segCount * 2 - $searchRange;
                $length = 16 + (8 * $segCount) + ($numGlyphs + 1);
                $cmap = [
                        4, $length, 0, // Format 4 Mapping subtable: format, length, language
                        $segCount * 2,
                        $searchRange,
                        $entrySelector,
                        $rangeShift];

                // endCode(s)
                foreach ($range as $start => $subrange) {
                        $endCode = $start + (count($subrange) - 1);
                        $cmap[] = $endCode; // endCode(s)
                }
                $cmap[] = 0xFFFF; // endCode of last Segment
                $cmap[] = 0; // reservedPad
                // startCode(s)
                foreach ($range as $start => $subrange) {
                        $cmap[] = $start; // startCode(s)
                }
                $cmap[] = 0xFFFF; // startCode of last Segment
                // idDelta(s)
                foreach ($range as $start => $subrange) {
                        $idDelta = -($start - $subrange[0]);
                        $n += count($subrange);
                        $cmap[] = $idDelta; // idDelta(s)
                }
                $cmap[] = 1; // idDelta of last Segment
                // idRangeOffset(s)
                foreach ($range as $subrange) {
                        $cmap[] = 0; // idRangeOffset[segCount]         Offset in bytes to glyph indexArray, or 0
                }
                $cmap[] = 0; // idRangeOffset of last Segment
                foreach ($range as $subrange) {
                        foreach ($subrange as $glidx) {
                                $cmap[] = $glidx;
                        }
                }
                $cmap[] = 0; // Mapping for last character
                $cmapstr4 = '';
                foreach ($cmap as $cm) {
                        $cmapstr4 .= pack("n", $cm);
                }

                ///////////////////////////////////
                // cmap - Character to glyph mapping
                ///////////////////////////////////
                $entryCount = count($subset);
                $length = 10 + $entryCount * 2;

                $off = 20 + $length;
                $hoff = $off >> 16;
                $loff = $off & 0xFFFF;

                $cmap = [0, 2, // Index : version, number of subtables
                        1, 0, // Subtable : platform, encoding
                        0, 20, // offset (hi,lo)
                        3, 0, // Subtable : platform, encoding  // See note above for 'name'
                        $hoff, $loff, // offset (hi,lo)
                        6, $length, // Format 6 Mapping table: format, length
                        0, 1, // language, First char code
                        $entryCount,
                ];
                $cmapstr = '';
                foreach ($subset as $code) {
                        $cmap[] = $codeToGlyph[$code];
                }
                foreach ($cmap as $cm) {
                        $cmapstr .= pack("n", $cm);
                }
                $cmapstr .= $cmapstr4;
                $this->add('cmap', $cmapstr);

                ///////////////////////////////////
                // hmtx - Horizontal Metrics
                ///////////////////////////////////
                $hmtxstr = '';
                for ($n = 0; $n < $numGlyphs; $n++) {
                        $originalGlyphIdx = $glyphMap[$n];
                        $hm = $this->getHMetric($orignHmetrics, $originalGlyphIdx);
                        $hmtxstr .= $hm;
                }
                $this->add('hmtx', $hmtxstr);

                ///////////////////////////////////
                // glyf - Glyph data
                ///////////////////////////////////
                list($glyfOffset, $glyfLength) = $this->get_table_pos('glyf');
                if ($glyfLength < $this->maxStrLenRead) {
                        $glyphData = $this->get_table('glyf');
                }

                $offsets = [];
                $glyf = '';
                $pos = 0;
                for ($n = 0; $n < $numGlyphs; $n++) {
                        $offsets[] = $pos;
                        $originalGlyphIdx = $glyphMap[$n];
                        $glyphPos = $this->glyphPos[$originalGlyphIdx];
                        $glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
                        if ($glyfLength < $this->maxStrLenRead) {
                                $data = substr($glyphData, $glyphPos, $glyphLen);
                        } else {
                                if ($glyphLen > 0) {
                                        $data = $this->get_chunk($glyfOffset + $glyphPos, $glyphLen);
                                } else {
                                        $data = '';
                                }
                        }
                        if ($glyphLen > 0) {
                                $up = unpack("n", substr($data, 0, 2));
                        }
                        if ($glyphLen > 2 && ($up[1] & (1 << 15))) {
                                $pos_in_glyph = 10;
                                $flags = GlyphOperator::MORE;
                                while ($flags & GlyphOperator::MORE) {
                                        $up = unpack("n", substr($data, $pos_in_glyph, 2));
                                        $flags = $up[1];
                                        $up = unpack("n", substr($data, $pos_in_glyph + 2, 2));
                                        $glyphIdx = $up[1];
                                        $data = $this->_set_ushort($data, $pos_in_glyph + 2, $glyphSet[$glyphIdx]);
                                        $pos_in_glyph += 4;
                                        if ($flags & GlyphOperator::WORDS) {
                                                $pos_in_glyph += 4;
                                        } else {
                                                $pos_in_glyph += 2;
                                        }
                                        if ($flags & GlyphOperator::SCALE) {
                                                $pos_in_glyph += 2;
                                        } else if ($flags & GlyphOperator::XYSCALE) {
                                                $pos_in_glyph += 4;
                                        } else if ($flags & GlyphOperator::TWOBYTWO) {
                                                $pos_in_glyph += 8;
                                        }
                                }
                        }
                        $glyf .= $data;
                        $pos += $glyphLen;
                        if ($pos % 4 != 0) {
                                $padding = 4 - ($pos % 4);
                                $glyf .= str_repeat("\0", $padding);
                                $pos += $padding;
                        }
                }
                $offsets[] = $pos;
                $this->add('glyf', $glyf);

                ///////////////////////////////////
                // loca - Index to location
                ///////////////////////////////////
                $locastr = '';
                if ((($pos + 1) >> 1) > 0xFFFF) {
                        $indexToLocFormat = 1;        // long format
                        foreach ($offsets as $offset) {
                                $locastr .= pack("N", $offset);
                        }
                } else {
                        $indexToLocFormat = 0;        // short format
                        foreach ($offsets as $offset) {
                                $locastr .= pack("n", ($offset / 2));
                        }
                }
                $this->add('loca', $locastr);

                ///////////////////////////////////
                // head - Font header
                ///////////////////////////////////
                $head = $this->get_table('head');
                $head = $this->_set_ushort($head, 50, $indexToLocFormat);
                $this->add('head', $head);

                fclose($this->fh);

                // Put the TTF file together
                $stm = '';
                $this->endTTFile($stm);

                //file_put_contents('testfont.ttf', $stm); exit;
                return $stm;
        }

        //////////////////////////////////////////////////////////////////////////////////
        // Recursively get composite glyph data
        function getGlyphData($originalGlyphIdx, &$maxdepth, &$depth, &$points, &$contours)
        {
                $depth++;
                $maxdepth = max($maxdepth, $depth);
                if (count($this->glyphdata[$originalGlyphIdx]['compGlyphs'])) {
                        foreach ($this->glyphdata[$originalGlyphIdx]['compGlyphs'] as $glyphIdx) {
                                $this->getGlyphData($glyphIdx, $maxdepth, $depth, $points, $contours);
                        }
                } else if (($this->glyphdata[$originalGlyphIdx]['nContours'] > 0) && $depth > 0) { // simple
                        $contours += $this->glyphdata[$originalGlyphIdx]['nContours'];
                        $points += $this->glyphdata[$originalGlyphIdx]['nPoints'];
                }
                $depth--;
        }

        //////////////////////////////////////////////////////////////////////////////////
        // Recursively get composite glyphs
        function getGlyphs($originalGlyphIdx, &$start, &$glyphSet, &$subsetglyphs)
        {
                $glyphPos = $this->glyphPos[$originalGlyphIdx];
                $glyphLen = $this->glyphPos[$originalGlyphIdx + 1] - $glyphPos;
                if (!$glyphLen) {
                        return;
                }
                $this->seek($start + $glyphPos);
                $numberOfContours = $this->read_short();
                if ($numberOfContours < 0) {
                        $this->skip(8);
                        $flags = GlyphOperator::MORE;
                        while ($flags & GlyphOperator::MORE) {
                                $flags = $this->read_ushort();
                                $glyphIdx = $this->read_ushort();
                                if (!isset($glyphSet[$glyphIdx])) {
                                        $glyphSet[$glyphIdx] = count($subsetglyphs); // old glyphID to new glyphID
                                        $subsetglyphs[$glyphIdx] = true;
                                }
                                $savepos = ftell($this->fh);
                                $this->getGlyphs($glyphIdx, $start, $glyphSet, $subsetglyphs);
                                $this->seek($savepos);
                                if ($flags & GlyphOperator::WORDS) {
                                        $this->skip(4);
                                } else {
                                        $this->skip(2);
                                }
                                if ($flags & GlyphOperator::SCALE) {
                                        $this->skip(2);
                                } else if ($flags & GlyphOperator::XYSCALE) {
                                        $this->skip(4);
                                } else if ($flags & GlyphOperator::TWOBYTWO) {
                                        $this->skip(8);
                                }
                        }
                }
        }

        //////////////////////////////////////////////////////////////////////////////////

        function getHMTX($numberOfHMetrics, $numGlyphs, &$glyphToChar, $scale)
        {
                $start = $this->seek_table("hmtx");
                $aw = 0;
                $this->charWidths = str_pad('', 256 * 256 * 2, "\x00");
                if ($this->maxUniChar > 65536) {
                        $this->charWidths .= str_pad('', 256 * 256 * 2, "\x00");
                } // Plane 1 SMP
                if ($this->maxUniChar > 131072) {
                        $this->charWidths .= str_pad('', 256 * 256 * 2, "\x00");
                } // Plane 2 SMP
                $nCharWidths = 0;
                if (($numberOfHMetrics * 4) < $this->maxStrLenRead) {
                        $data = $this->get_chunk($start, ($numberOfHMetrics * 4));
                        $arr = unpack("n*", $data);
                } else {
                        $this->seek($start);
                }
                for ($glyph = 0; $glyph < $numberOfHMetrics; $glyph++) {
                        if (($numberOfHMetrics * 4) < $this->maxStrLenRead) {
                                $aw = $arr[($glyph * 2) + 1];
                        } else {
                                $aw = $this->read_ushort();
                                $lsb = $this->read_ushort();
                        }
                        if (isset($glyphToChar[$glyph]) || $glyph == 0) {
                                if ($aw >= (1 << 15)) {
                                        $aw = 0;
                                } // 1.03 Some (arabic) fonts have -ve values for width
                                // although should be unsigned value - comes out as e.g. 65108 (intended -50)
                                if ($glyph == 0) {
                                        $this->defaultWidth = $scale * $aw;
                                        continue;
                                }
                                foreach ($glyphToChar[$glyph] as $char) {
                                        if ($char != 0 && $char != 65535) {
                                                $w = intval(round($scale * $aw));
                                                if ($w == 0) {
                                                        $w = 65535;
                                                }
                                                if ($char < 196608) {
                                                        $this->charWidths[$char * 2] = chr($w >> 8);
                                                        $this->charWidths[$char * 2 + 1] = chr($w & 0xFF);
                                                        $nCharWidths++;
                                                }
                                        }
                                }
                        }
                }

                $data = $this->get_chunk(($start + $numberOfHMetrics * 4), ($numGlyphs * 2));
                $arr = unpack("n*", $data);
                $diff = $numGlyphs - $numberOfHMetrics;
                $w = intval(round($scale * $aw));
                if ($w == 0) {
                        $w = 65535;
                }
                for ($pos = 0; $pos < $diff; $pos++) {
                        $glyph = $pos + $numberOfHMetrics;
                        if (isset($glyphToChar[$glyph])) {
                                foreach ($glyphToChar[$glyph] as $char) {
                                        if ($char != 0 && $char != 65535) {
                                                if ($char < 196608) {
                                                        $this->charWidths[$char * 2] = chr($w >> 8);
                                                        $this->charWidths[$char * 2 + 1] = chr($w & 0xFF);
                                                        $nCharWidths++;
                                                }
                                        }
                                }
                        }
                }
                // NB 65535 is a set width of 0
                // First bytes define number of chars in font
                $this->charWidths[0] = chr($nCharWidths >> 8);
                $this->charWidths[1] = chr($nCharWidths & 0xFF);
        }

        function getHMetric($numberOfHMetrics, $gid)
        {
                $start = $this->seek_table("hmtx");
                if ($gid < $numberOfHMetrics) {
                        $this->seek($start + ($gid * 4));
                        $hm = fread($this->fh, 4);
                } else {
                        $this->seek($start + (($numberOfHMetrics - 1) * 4));
                        $hm = fread($this->fh, 2);
                        $this->seek($start + ($numberOfHMetrics * 2) + ($gid * 2));
                        $hm .= fread($this->fh, 2);
                }

                return $hm;
        }

        function getLOCA($indexToLocFormat, $numGlyphs)
        {
                $start = $this->seek_table('loca');
                $this->glyphPos = [];
                if ($indexToLocFormat == 0) {
                        $data = $this->get_chunk($start, ($numGlyphs * 2) + 2);
                        $arr = unpack("n*", $data);
                        for ($n = 0; $n <= $numGlyphs; $n++) {
                                $this->glyphPos[] = ($arr[$n + 1] * 2);
                        }
                } else if ($indexToLocFormat == 1) {
                        $data = $this->get_chunk($start, ($numGlyphs * 4) + 4);
                        $arr = unpack("N*", $data);
                        for ($n = 0; $n <= $numGlyphs; $n++) {
                                $this->glyphPos[] = ($arr[$n + 1]);
                        }
                } else {
                        throw new \Mpdf\MpdfException('Unknown location table format ' . $indexToLocFormat);
                }
        }

        // CMAP Format 4
        function getCMAP4($unicode_cmap_offset, &$glyphToChar, &$charToGlyph)
        {
                $this->maxUniChar = 0;
                $this->seek($unicode_cmap_offset + 2);
                $length = $this->read_ushort();
                $limit = $unicode_cmap_offset + $length;
                $this->skip(2);

                $segCount = $this->read_ushort() / 2;
                $this->skip(6);
                $endCount = [];
                for ($i = 0; $i < $segCount; $i++) {
                        $endCount[] = $this->read_ushort();
                }
                $this->skip(2);
                $startCount = [];
                for ($i = 0; $i < $segCount; $i++) {
                        $startCount[] = $this->read_ushort();
                }
                $idDelta = [];
                for ($i = 0; $i < $segCount; $i++) {
                        $idDelta[] = $this->read_short();
                }  // ???? was unsigned short
                $idRangeOffset_start = $this->_pos;
                $idRangeOffset = [];
                for ($i = 0; $i < $segCount; $i++) {
                        $idRangeOffset[] = $this->read_ushort();
                }

                for ($n = 0; $n < $segCount; $n++) {
                        $endpoint = ($endCount[$n] + 1);
                        for ($unichar = $startCount[$n]; $unichar < $endpoint; $unichar++) {
                                if ($idRangeOffset[$n] == 0) {
                                        $glyph = ($unichar + $idDelta[$n]) & 0xFFFF;
                                } else {
                                        $offset = ($unichar - $startCount[$n]) * 2 + $idRangeOffset[$n];
                                        $offset = $idRangeOffset_start + 2 * $n + $offset;
                                        if ($offset >= $limit) {
                                                $glyph = 0;
                                        } else {
                                                $glyph = $this->get_ushort($offset);
                                                if ($glyph != 0) {
                                                        $glyph = ($glyph + $idDelta[$n]) & 0xFFFF;
                                                }
                                        }
                                }
                                $charToGlyph[$unichar] = $glyph;
                                if ($unichar < 196608) {
                                        $this->maxUniChar = max($unichar, $this->maxUniChar);
                                }
                                $glyphToChar[$glyph][] = $unichar;
                        }
                }
        }

        // Put the TTF file together
        function endTTFile(&$stm)
        {
                $stm = '';
                $numTables = count($this->otables);
                $searchRange = 1;
                $entrySelector = 0;
                while ($searchRange * 2 <= $numTables) {
                        $searchRange = $searchRange * 2;
                        $entrySelector = $entrySelector + 1;
                }
                $searchRange = $searchRange * 16;
                $rangeShift = $numTables * 16 - $searchRange;

                // Header
                if (_TTF_MAC_HEADER) {
                        $stm .= (pack("Nnnnn", 0x74727565, $numTables, $searchRange, $entrySelector, $rangeShift)); // Mac
                } else {
                        $stm .= (pack("Nnnnn", 0x00010000, $numTables, $searchRange, $entrySelector, $rangeShift)); // Windows
                }

                // Table directory
                $tables = $this->otables;
                ksort($tables);
                $offset = 12 + $numTables * 16;
                foreach ($tables as $tag => $data) {
                        if ($tag == 'head') {
                                $head_start = $offset;
                        }
                        $stm .= $tag;
                        $checksum = $this->calcChecksum($data);
                        $stm .= pack("nn", $checksum[0], $checksum[1]);
                        $stm .= pack("NN", $offset, strlen($data));
                        $paddedLength = (strlen($data) + 3) & ~3;
                        $offset = $offset + $paddedLength;
                }

                // Table data
                foreach ($tables as $tag => $data) {
                        $data .= "\0\0\0";
                        $stm .= substr($data, 0, (strlen($data) & ~3));
                }

                $checksum = $this->calcChecksum($stm);
                $checksum = $this->sub32([0xB1B0, 0xAFBA], $checksum);
                $chk = pack("nn", $checksum[0], $checksum[1]);
                $stm = $this->splice($stm, ($head_start + 8), $chk);

                return $stm;
        }

        function repackageTTF($file, $TTCfontID = 0, $debug = false, $useOTL = false)
        {
        // mPDF 5.7.1
                // (Does not called for subsets)
                $this->useOTL = $useOTL; // mPDF 5.7.1
                $this->filename = $file;
                $this->fh = fopen($file, 'rb');

                if (!$this->fh) {
                        throw new \Mpdf\MpdfException('Can\'t open file ' . $file);
                }

                $this->_pos = 0;
                $this->charWidths = '';
                $this->glyphPos = [];
                $this->charToGlyph = [];
                $this->tables = [];
                $this->otables = [];
                $this->ascent = 0;
                $this->descent = 0;
                $this->strikeoutSize = 0;
                $this->strikeoutPosition = 0;
                $this->numTTCFonts = 0;
                $this->TTCFonts = [];
                $this->skip(4);
                $this->maxUni = 0;
                if ($TTCfontID > 0) {
                        $this->version = $version = $this->read_ulong(); // TTC Header version now
                        if (!in_array($version, [0x00010000, 0x00020000])) {
                                throw new \Mpdf\MpdfException("ERROR - Error parsing TrueType Collection: version=" . $version . " - " . $file);
                        }
                        $this->numTTCFonts = $this->read_ulong();
                        for ($i = 1; $i <= $this->numTTCFonts; $i++) {
                                $this->TTCFonts[$i]['offset'] = $this->read_ulong();
                        }
                        $this->seek($this->TTCFonts[$TTCfontID]['offset']);
                        $this->version = $version = $this->read_ulong(); // TTFont version again now
                }
                $this->readTableDirectory($debug);
                $tags = ['OS/2', 'glyf', 'head', 'hhea', 'hmtx', 'loca', 'maxp', 'name', 'post', 'cvt ', 'fpgm', 'gasp', 'prep'];

                foreach ($tags as $tag) {
                        if (isset($this->tables[$tag])) {
                                $this->add($tag, $this->get_table($tag));
                        }
                }

                // mPDF 5.7.1
                if ($useOTL) {
                        ///////////////////////////////////
                        // maxp - Maximum profile table
                        ///////////////////////////////////
                        $this->seek_table("maxp");
                        $this->skip(4);
                        $numGlyphs = $this->read_ushort();

                        ///////////////////////////////////
                        // cmap - Character to glyph index mapping table
                        ///////////////////////////////////
                        $cmap_offset = $this->seek_table("cmap");
                        $this->skip(2);
                        $cmapTableCount = $this->read_ushort();
                        $unicode_cmap_offset = 0;
                        for ($i = 0; $i < $cmapTableCount; $i++) {
                                $platformID = $this->read_ushort();
                                $encodingID = $this->read_ushort();
                                $offset = $this->read_ulong();
                                $save_pos = $this->_pos;
                                if (($platformID == 3 && $encodingID == 1) || $platformID == 0) { // Microsoft, Unicode
                                        $format = $this->get_ushort($cmap_offset + $offset);
                                        if ($format == 4) {
                                                $unicode_cmap_offset = $cmap_offset + $offset;
                                                break;
                                        }
                                }
                                $this->seek($save_pos);
                        }

                        if (!$unicode_cmap_offset) {
                                throw new \Mpdf\MpdfException('Font (' . $this->filename . ') does not have cmap for Unicode (platform 3, encoding 1, format 4, or platform 0, any encoding, format 4)');
                        }

                        $glyphToChar = [];
                        $charToGlyph = [];
                        $this->getCMAP4($unicode_cmap_offset, $glyphToChar, $charToGlyph);

                        ///////////////////////////////////
                        // Map Unmapped glyphs - from $numGlyphs
                        $bctr = 0xE000;
                        for ($gid = 1; $gid < $numGlyphs; $gid++) {
                                if (!isset($glyphToChar[$gid])) {
                                        while (isset($charToGlyph[$bctr])) {
                                                $bctr++;
                                        } // Avoid overwriting a glyph already mapped in PUA (6,400)
                                        if ($bctr > 0xF8FF) {
                                                throw new \Mpdf\MpdfException("Problem. Trying to repackage TF file; not enough space for unmapped glyphs");
                                        }
                                        $glyphToChar[$gid][] = $bctr;
                                        $charToGlyph[$bctr] = $gid;
                                        $bctr++;
                                }
                        }
                        ///////////////////////////////////
                        ///////////////////////////////////
                        // Sort CID2GID map into segments of contiguous codes
                        ///////////////////////////////////
                        unset($charToGlyph[65535]);
                        unset($charToGlyph[0]);
                        ksort($charToGlyph);
                        $rangeid = 0;
                        $range = [];
                        $prevcid = -2;
                        $prevglidx = -1;
                        // for each character
                        foreach ($charToGlyph as $cid => $glidx) {
                                if ($cid == ($prevcid + 1) && $glidx == ($prevglidx + 1)) {
                                        $range[$rangeid][] = $glidx;
                                } else {
                                        // new range
                                        $rangeid = $cid;
                                        $range[$rangeid] = [];
                                        $range[$rangeid][] = $glidx;
                                }
                                $prevcid = $cid;
                                $prevglidx = $glidx;
                        }

                        ///////////////////////////////////
                        // CMap table
                        ///////////////////////////////////
                        // cmap - Character to glyph mapping
                        $segCount = count($range) + 1; // + 1 Last segment has missing character 0xFFFF
                        $searchRange = 1;
                        $entrySelector = 0;
                        while ($searchRange * 2 <= $segCount) {
                                $searchRange = $searchRange * 2;
                                $entrySelector = $entrySelector + 1;
                        }
                        $searchRange = $searchRange * 2;
                        $rangeShift = $segCount * 2 - $searchRange;
                        $length = 16 + (8 * $segCount) + ($numGlyphs + 1);
                        $cmap = [0, 3, // Index : version, number of encoding subtables
                                0, 0, // Encoding Subtable : platform (UNI=0), encoding 0
                                0, 28, // Encoding Subtable : offset (hi,lo)
                                0, 3, // Encoding Subtable : platform (UNI=0), encoding 3
                                0, 28, // Encoding Subtable : offset (hi,lo)
                                3, 1, // Encoding Subtable : platform (MS=3), encoding 1
                                0, 28, // Encoding Subtable : offset (hi,lo)
                                4, $length, 0, // Format 4 Mapping subtable: format, length, language
                                $segCount * 2,
                                $searchRange,
                                $entrySelector,
                                $rangeShift];

                        // endCode(s)
                        foreach ($range as $start => $subrange) {
                                $endCode = $start + (count($subrange) - 1);
                                $cmap[] = $endCode; // endCode(s)
                        }
                        $cmap[] = 0xFFFF; // endCode of last Segment
                        $cmap[] = 0; // reservedPad
                        // startCode(s)
                        foreach ($range as $start => $subrange) {
                                $cmap[] = $start; // startCode(s)
                        }
                        $cmap[] = 0xFFFF; // startCode of last Segment
                        // idDelta(s)
                        foreach ($range as $start => $subrange) {
                                $idDelta = -($start - $subrange[0]);
                                //$n += count($subrange);       // ?? Line not required
                                $cmap[] = $idDelta; // idDelta(s)
                        }
                        $cmap[] = 1; // idDelta of last Segment
                        // idRangeOffset(s)
                        foreach ($range as $subrange) {
                                $cmap[] = 0; // idRangeOffset[segCount]         Offset in bytes to glyph indexArray, or 0
                        }
                        $cmap[] = 0; // idRangeOffset of last Segment
                        foreach ($range as $subrange) {
                                foreach ($subrange as $glidx) {
                                        $cmap[] = $glidx;
                                }
                        }
                        $cmap[] = 0; // Mapping for last character
                        $cmapstr = '';
                        foreach ($cmap as $cm) {
                                $cmapstr .= pack("n", $cm);
                        }
                        $this->add('cmap', $cmapstr);
                } else {
                        $this->add('cmap', $this->get_table('cmap'));
                }

                fclose($this->fh);
                $stm = '';
                $this->endTTFile($stm);

                return $stm;
        }
}