<?php





/*******************************************************************************

* 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.              *

*                                                                              *

* Version:  1.05                                                               *

* Date:     2018-03-19                                                         *

* Author:   Ian Back <ianb@bpm1.com>                                           *

* License:  LGPL                                                               *

* Copyright (c) Ian Back, 2010                                                 *

* This header must be retained in any redistribution or                        *

* modification of the file.                                                    *

*                                                                              *

*******************************************************************************/



// 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(!)

define("_TTF_MAC_HEADER", false);





// TrueType Font Glyph operators

define("GF_WORDS",(1 << 0));

define("GF_SCALE",(1 << 3));

define("GF_MORE",(1 << 5));

define("GF_XYSCALE",(1 << 6));

define("GF_TWOBYTWO",(1 << 7));







class TTFontFile
{

var $maxUniChar;
var $codeToGlyph;
var $glyphdata;

var $maxUni;

var $_pos;

var $numTables;

var $searchRange;

var $entrySelector;

var $rangeShift;

var $tables;

var $otables;

var $filename;

var $fh;

var $hmetrics;

var $glyphPos;

var $charToGlyph;

var $ascent;

var $descent;

var $name;

var $familyName;

var $styleName;

var $fullName;

var $uniqueFontID;

var $unitsPerEm;

var $bbox;

var $capHeight;

var $stemV;

var $italicAngle;

var $flags;

var $underlinePosition;

var $underlineThickness;

var $charWidths;

var $defaultWidth;

var $maxStrLenRead;

	public $TTCFonts;
	public $version;
	public $sFamilyClass;
	public $sFamilySubClass;
	public $restrictedUse;



	function __construct() {

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

	}





	function getMetrics($file) {

		$this->filename = $file;

		$this->fh = fopen($file,'rb') or die('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->TTCFonts = [];

		$this->version = $version = $this->read_ulong();

		if ($version==0x4F54544F) 

			die("Postscript outlines are not supported");

		if ($version==0x74746366) 

			die("ERROR - TrueType Fonts Collections not supported");

		if (!in_array($version, array(0x00010000,0x74727565)))

			die("Not a TrueType font: version=".$version);

		$this->readTableDirectory();

		$this->extractInfo();

		fclose($this->fh);

	}





	function readTableDirectory() {

	    $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();

                $record['checksum'] = array($this->read_ushort(),$this->read_ushort());

                $record['offset'] = $this->read_ulong();

                $record['length'] = $this->read_ulong();

                $this->tables[$record['tag']] = $record;

		}

	}





	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 array($reshi, $reslo);

	}



	function calcChecksum($data)  {

		if (strlen($data) % 4) { $data .= str_repeat("\0",(4-(strlen($data) % 4))); }

		$hi=0x0000;

		$lo=0x0000;

		for($i=0;$i<strlen($data);$i+=4) {

			$hi += (ord($data[$i])<<8) + ord($data[$i+1]);

			$lo += (ord($data[$i+2])<<8) + ord($data[$i+3]);

			$hi += $lo >> 16;

			$lo = $lo & 0xFFFF;

			$hi = $hi & 0xFFFF;

		}

		return array($hi, $lo);

	}



	function get_table_pos($tag) {

		$offset = $this->tables[$tag]['offset'];

		$length = $this->tables[$tag]['length'];

		return array($offset, $length);

	}



	function seek($pos) {

		$this->_pos = $pos;

		fseek($this->fh,$this->_pos);

	}



	function skip($delta) {

		$this->_pos = $this->_pos + $delta;

		fseek($this->fh,$this->_pos);

	}



	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 ($length == 0) { die('Truetype font ('.$this->filename.'): error reading table: '.$tag); }

		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 extractInfo() {

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

		// name - Naming table

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

			$this->sFamilyClass = 0;

			$this->sFamilySubClass = 0;



			$name_offset = $this->seek_table("name");

			$format = $this->read_ushort();

			if ($format != 0)

				die("Unknown name table format ".$format);

			$numRecords = $this->read_ushort();

			$string_data_offset = $name_offset + $this->read_ushort();

			$names = array(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)

						die("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)

				die("Could not find PostScript font name");

			$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 ($names[6]) { $this->fullName = $names[6]; }



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

		// head - Font header table

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

		$this->seek_table("head");

		$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();

		$this->bbox = array(($xMin*$scale), ($yMin*$scale), ($xMax*$scale), ($yMax*$scale));

		$this->skip(3*2);

		$indexToLocFormat = $this->read_ushort();

		$glyphDataFormat = $this->read_ushort();

		if ($glyphDataFormat != 0)

			die('Unknown glyph data format '.$glyphDataFormat);



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

		// hhea metrics table

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

		// ttf2t1 seems to use this value rather than the one in OS/2 - so put in for compatibility

		if (isset($this->tables["hhea"])) {

			$this->seek_table("hhea");

			$this->skip(4);

			$hheaAscender = $this->read_short();

			$hheaDescender = $this->read_short();

			$this->ascent = ($hheaAscender *$scale);

			$this->descent = ($hheaDescender *$scale);

		}



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

		// OS/2 - OS/2 and Windows metrics table

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

		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) {

				die('ERROR - Font file '.$this->filename.' cannot be embedded due to copyright restrictions.');

				$this->restrictedUse = true;

			}

			$this->skip(20);

			$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->skip(26);

			$sTypoAscender = $this->read_short();

			$sTypoDescender = $this->read_short();

			if (!$this->ascent) $this->ascent = ($sTypoAscender*$scale);

			if (!$this->descent) $this->descent = ($sTypoDescender*$scale);

			if ($version > 1) {

				$this->skip(16);

				$sCapHeight = $this->read_short();

				$this->capHeight = ($sCapHeight*$scale);

			}

			else {

				$this->capHeight = $this->ascent;

			}

		}

		else {

			$usWeightClass = 500;

			if (!$this->ascent) $this->ascent = ($yMax*$scale);

			if (!$this->descent) $this->descent = ($yMin*$scale);

			$this->capHeight = $this->ascent;

		}

		$this->stemV = 50 + intval(pow(($usWeightClass / 65.0),2));



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

		// post - PostScript table

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

		$this->seek_table("post");

		$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");

		$this->skip(32); 

		$metricDataFormat = $this->read_ushort();

		if ($metricDataFormat != 0)

			die('Unknown horizontal metric data format '.$metricDataFormat);

		$numberOfHMetrics = $this->read_ushort();

		if ($numberOfHMetrics == 0) 

			die('Number of horizontal metrics is 0');



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

		// 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) {

					if (!$unicode_cmap_offset) $unicode_cmap_offset = $cmap_offset + $offset;

					break;

				}

			}

			$this->seek($save_pos );

		}

		if (!$unicode_cmap_offset)

			die('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 );



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

		// hmtx - Horizontal metrics table

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

		$this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);



	}





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

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





	function makeSubset($file, &$subset) {

		$this->filename = $file;

		$this->fh = fopen($file ,'rb') or die('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->skip(4);

		$this->maxUni = 0;

		$this->readTableDirectory();





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

		// 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)

			die('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 );



		$this->charToGlyph = $charToGlyph;



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

		// hmtx - Horizontal metrics table

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

		$scale = 1;	// not used

		$this->getHMTX($numberOfHMetrics, $numGlyphs, $glyphToChar, $scale);



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

		// loca - Index to location

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

		$this->getLOCA($indexToLocFormat, $numGlyphs);



		$subsetglyphs = array(0=>0); 

		$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 );



		//tables copied from the original

		$tags = array ('name');

		foreach($tags AS $tag) { $this->add($tag, $this->get_table($tag)); }

		$tags = array ('cvt ', 'fpgm', 'prep', 'gasp');

		foreach($tags AS $tag) {

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

		}



		// post - PostScript

		$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 - Character to glyph mapping - Format 4 (MS / )

		$segCount = count($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 = array(0, 1,		// Index : version, number of encoding subtables

			3, 1,				// Encoding Subtable : platform (MS=3), encoding (Unicode)

			0, 12,			// 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) {

				$up = unpack("n", substr($data,0,2));

			}



			if ($glyphLen > 2 && ($up[1] & (1 << 15)) ) {	// If number of contours <= -1 i.e. composite glyph

				$pos_in_glyph = 10;

				$flags = GF_MORE;

				$nComponentElements = 0;

				while ($flags & GF_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 & GF_WORDS) { $pos_in_glyph += 4; }

					else { $pos_in_glyph += 2; }

					if ($flags & GF_SCALE) { $pos_in_glyph += 2; }

					else if ($flags & GF_XYSCALE) { $pos_in_glyph += 4; }

					else if ($flags & GF_TWOBYTWO) { $pos_in_glyph += 8; }

				}

				$maxComponentElements = max($maxComponentElements, $nComponentElements);

			}



			$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);



		// 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);

		$this->add('head', $head);





		// 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);





		// OS/2 - OS/2

		$os2 = $this->get_table('OS/2');

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



		fclose($this->fh);



		// Put the TTF file together

		$stm = '';

		$this->endTTFile($stm);

		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 = GF_MORE;

			while ($flags & GF_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 & GF_WORDS)

					$this->skip(4);

				else

					$this->skip(2);

				if ($flags & GF_SCALE)

					$this->skip(2);

				else if ($flags & GF_XYSCALE)

					$this->skip(4);

				else if ($flags & GF_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");

		$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;

		for( $pos=0; $pos<$diff; $pos++) {

			$glyph = $pos + $numberOfHMetrics;

			if (isset($glyphToChar[$glyph])) {

				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++;

						}

					}

				}

			}

		}

		// 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 

			die('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(array(0xB1B0,0xAFBA), $checksum);

		$chk = pack("nn", $checksum[0],$checksum[1]);

		$stm = $this->splice($stm,($head_start + 8),$chk);

		return $stm ;

	}









}





?>