From d5760603472a1a4f07acdda1ef44f8115a8bc269 Mon Sep 17 00:00:00 2001
From: Saketh1499
Date: Tue, 27 Jul 2021 10:13:41 +0530
Subject: Certificate generation

---
 pdf/fpdf/makefont/ttfparser.php | 723 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 723 insertions(+)
 create mode 100755 pdf/fpdf/makefont/ttfparser.php

(limited to 'pdf/fpdf/makefont/ttfparser.php')

diff --git a/pdf/fpdf/makefont/ttfparser.php b/pdf/fpdf/makefont/ttfparser.php
new file mode 100755
index 0000000..e6ba321
--- /dev/null
+++ b/pdf/fpdf/makefont/ttfparser.php
@@ -0,0 +1,723 @@
+<?php
+/*******************************************************************************
+* Class to parse and subset TrueType fonts                                     *
+*                                                                              *
+* Version: 1.1                                                                 *
+* Date:    2015-11-29                                                          *
+* Author:  Olivier PLATHEY                                                     *
+*******************************************************************************/
+
+class TTFParser
+{
+	protected $f;
+	protected $tables;
+	protected $numberOfHMetrics;
+	protected $numGlyphs;
+	protected $glyphNames;
+	protected $indexToLocFormat;
+	protected $subsettedChars;
+	protected $subsettedGlyphs;
+	public $chars;
+	public $glyphs;
+	public $unitsPerEm;
+	public $xMin, $yMin, $xMax, $yMax;
+	public $postScriptName;
+	public $embeddable;
+	public $bold;
+	public $typoAscender;
+	public $typoDescender;
+	public $capHeight;
+	public $italicAngle;
+	public $underlinePosition;
+	public $underlineThickness;
+	public $isFixedPitch;
+
+	function __construct($file)
+	{
+		$this->f = fopen($file, 'rb');
+		if(!$this->f)
+			$this->Error('Can\'t open file: '.$file);
+	}
+
+	function __destruct()
+	{
+		if(is_resource($this->f))
+			fclose($this->f);
+	}
+
+	function Parse()
+	{
+		$this->ParseOffsetTable();
+		$this->ParseHead();
+		$this->ParseHhea();
+		$this->ParseMaxp();
+		$this->ParseHmtx();
+		$this->ParseLoca();
+		$this->ParseGlyf();
+		$this->ParseCmap();
+		$this->ParseName();
+		$this->ParseOS2();
+		$this->ParsePost();
+	}
+
+	function ParseOffsetTable()
+	{
+		$version = $this->Read(4);
+		if($version=='OTTO')
+			$this->Error('OpenType fonts based on PostScript outlines are not supported');
+		if($version!="\x00\x01\x00\x00")
+			$this->Error('Unrecognized file format');
+		$numTables = $this->ReadUShort();
+		$this->Skip(3*2); // searchRange, entrySelector, rangeShift
+		$this->tables = array();
+		for($i=0;$i<$numTables;$i++)
+		{
+			$tag = $this->Read(4);
+			$checkSum = $this->Read(4);
+			$offset = $this->ReadULong();
+			$length = $this->ReadULong(4);
+			$this->tables[$tag] = array('offset'=>$offset, 'length'=>$length, 'checkSum'=>$checkSum);
+		}
+	}	
+
+	function ParseHead()
+	{
+		$this->Seek('head');
+		$this->Skip(3*4); // version, fontRevision, checkSumAdjustment
+		$magicNumber = $this->ReadULong();
+		if($magicNumber!=0x5F0F3CF5)
+			$this->Error('Incorrect magic number');
+		$this->Skip(2); // flags
+		$this->unitsPerEm = $this->ReadUShort();
+		$this->Skip(2*8); // created, modified
+		$this->xMin = $this->ReadShort();
+		$this->yMin = $this->ReadShort();
+		$this->xMax = $this->ReadShort();
+		$this->yMax = $this->ReadShort();
+		$this->Skip(3*2); // macStyle, lowestRecPPEM, fontDirectionHint
+		$this->indexToLocFormat = $this->ReadShort();
+	}
+
+	function ParseHhea()
+	{
+		$this->Seek('hhea');
+		$this->Skip(4+15*2);
+		$this->numberOfHMetrics = $this->ReadUShort();
+	}
+
+	function ParseMaxp()
+	{
+		$this->Seek('maxp');
+		$this->Skip(4);
+		$this->numGlyphs = $this->ReadUShort();
+	}
+
+	function ParseHmtx()
+	{
+		$this->Seek('hmtx');
+		$this->glyphs = array();
+		for($i=0;$i<$this->numberOfHMetrics;$i++)
+		{
+			$advanceWidth = $this->ReadUShort();
+			$lsb = $this->ReadShort();
+			$this->glyphs[$i] = array('w'=>$advanceWidth, 'lsb'=>$lsb);
+		}
+		for($i=$this->numberOfHMetrics;$i<$this->numGlyphs;$i++)
+		{
+			$lsb = $this->ReadShort();
+			$this->glyphs[$i] = array('w'=>$advanceWidth, 'lsb'=>$lsb);
+		}
+	}
+
+	function ParseLoca()
+	{
+		$this->Seek('loca');
+		$offsets = array();
+		if($this->indexToLocFormat==0)
+		{
+			// Short format
+			for($i=0;$i<=$this->numGlyphs;$i++)
+				$offsets[] = 2*$this->ReadUShort();
+		}
+		else
+		{
+			// Long format
+			for($i=0;$i<=$this->numGlyphs;$i++)
+				$offsets[] = $this->ReadULong();
+		}
+		for($i=0;$i<$this->numGlyphs;$i++)
+		{
+			$this->glyphs[$i]['offset'] = $offsets[$i];
+			$this->glyphs[$i]['length'] = $offsets[$i+1] - $offsets[$i];
+		}
+	}
+
+	function ParseGlyf()
+	{
+		$tableOffset = $this->tables['glyf']['offset'];
+		foreach($this->glyphs as &$glyph)
+		{
+			if($glyph['length']>0)
+			{
+				fseek($this->f, $tableOffset+$glyph['offset'], SEEK_SET);
+				if($this->ReadShort()<0)
+				{
+					// Composite glyph
+					$this->Skip(4*2); // xMin, yMin, xMax, yMax
+					$offset = 5*2;
+					$a = array();
+					do
+					{
+						$flags = $this->ReadUShort();
+						$index = $this->ReadUShort();
+						$a[$offset+2] = $index;
+						if($flags & 1) // ARG_1_AND_2_ARE_WORDS
+							$skip = 2*2;
+						else
+							$skip = 2;
+						if($flags & 8) // WE_HAVE_A_SCALE
+							$skip += 2;
+						elseif($flags & 64) // WE_HAVE_AN_X_AND_Y_SCALE
+							$skip += 2*2;
+						elseif($flags & 128) // WE_HAVE_A_TWO_BY_TWO
+							$skip += 4*2;
+						$this->Skip($skip);
+						$offset += 2*2 + $skip;
+					}
+					while($flags & 32); // MORE_COMPONENTS
+					$glyph['components'] = $a;
+				}
+			}
+		}
+	}
+
+	function ParseCmap()
+	{
+		$this->Seek('cmap');
+		$this->Skip(2); // version
+		$numTables = $this->ReadUShort();
+		$offset31 = 0;
+		for($i=0;$i<$numTables;$i++)
+		{
+			$platformID = $this->ReadUShort();
+			$encodingID = $this->ReadUShort();
+			$offset = $this->ReadULong();
+			if($platformID==3 && $encodingID==1)
+				$offset31 = $offset;
+		}
+		if($offset31==0)
+			$this->Error('No Unicode encoding found');
+
+		$startCount = array();
+		$endCount = array();
+		$idDelta = array();
+		$idRangeOffset = array();
+		$this->chars = array();
+		fseek($this->f, $this->tables['cmap']['offset']+$offset31, SEEK_SET);
+		$format = $this->ReadUShort();
+		if($format!=4)
+			$this->Error('Unexpected subtable format: '.$format);
+		$this->Skip(2*2); // length, language
+		$segCount = $this->ReadUShort()/2;
+		$this->Skip(3*2); // searchRange, entrySelector, rangeShift
+		for($i=0;$i<$segCount;$i++)
+			$endCount[$i] = $this->ReadUShort();
+		$this->Skip(2); // reservedPad
+		for($i=0;$i<$segCount;$i++)
+			$startCount[$i] = $this->ReadUShort();
+		for($i=0;$i<$segCount;$i++)
+			$idDelta[$i] = $this->ReadShort();
+		$offset = ftell($this->f);
+		for($i=0;$i<$segCount;$i++)
+			$idRangeOffset[$i] = $this->ReadUShort();
+
+		for($i=0;$i<$segCount;$i++)
+		{
+			$c1 = $startCount[$i];
+			$c2 = $endCount[$i];
+			$d = $idDelta[$i];
+			$ro = $idRangeOffset[$i];
+			if($ro>0)
+				fseek($this->f, $offset+2*$i+$ro, SEEK_SET);
+			for($c=$c1;$c<=$c2;$c++)
+			{
+				if($c==0xFFFF)
+					break;
+				if($ro>0)
+				{
+					$gid = $this->ReadUShort();
+					if($gid>0)
+						$gid += $d;
+				}
+				else
+					$gid = $c+$d;
+				if($gid>=65536)
+					$gid -= 65536;
+				if($gid>0)
+					$this->chars[$c] = $gid;
+			}
+		}
+	}
+
+	function ParseName()
+	{
+		$this->Seek('name');
+		$tableOffset = $this->tables['name']['offset'];
+		$this->postScriptName = '';
+		$this->Skip(2); // format
+		$count = $this->ReadUShort();
+		$stringOffset = $this->ReadUShort();
+		for($i=0;$i<$count;$i++)
+		{
+			$this->Skip(3*2); // platformID, encodingID, languageID
+			$nameID = $this->ReadUShort();
+			$length = $this->ReadUShort();
+			$offset = $this->ReadUShort();
+			if($nameID==6)
+			{
+				// PostScript name
+				fseek($this->f, $tableOffset+$stringOffset+$offset, SEEK_SET);
+				$s = $this->Read($length);
+				$s = str_replace(chr(0), '', $s);
+				$s = preg_replace('|[ \[\](){}<>/%]|', '', $s);
+				$this->postScriptName = $s;
+				break;
+			}
+		}
+		if($this->postScriptName=='')
+			$this->Error('PostScript name not found');
+	}
+
+	function ParseOS2()
+	{
+		$this->Seek('OS/2');
+		$version = $this->ReadUShort();
+		$this->Skip(3*2); // xAvgCharWidth, usWeightClass, usWidthClass
+		$fsType = $this->ReadUShort();
+		$this->embeddable = ($fsType!=2) && ($fsType & 0x200)==0;
+		$this->Skip(11*2+10+4*4+4);
+		$fsSelection = $this->ReadUShort();
+		$this->bold = ($fsSelection & 32)!=0;
+		$this->Skip(2*2); // usFirstCharIndex, usLastCharIndex
+		$this->typoAscender = $this->ReadShort();
+		$this->typoDescender = $this->ReadShort();
+		if($version>=2)
+		{
+			$this->Skip(3*2+2*4+2);
+			$this->capHeight = $this->ReadShort();
+		}
+		else
+			$this->capHeight = 0;
+	}
+
+	function ParsePost()
+	{
+		$this->Seek('post');
+		$version = $this->ReadULong();
+		$this->italicAngle = $this->ReadShort();
+		$this->Skip(2); // Skip decimal part
+		$this->underlinePosition = $this->ReadShort();
+		$this->underlineThickness = $this->ReadShort();
+		$this->isFixedPitch = ($this->ReadULong()!=0);
+		if($version==0x20000)
+		{
+			// Extract glyph names
+			$this->Skip(4*4); // min/max usage
+			$this->Skip(2); // numberOfGlyphs
+			$glyphNameIndex = array();
+			$names = array();
+			$numNames = 0;
+			for($i=0;$i<$this->numGlyphs;$i++)
+			{
+				$index = $this->ReadUShort();
+				$glyphNameIndex[] = $index;
+				if($index>=258 && $index-257>$numNames)
+					$numNames = $index-257;
+			}
+			for($i=0;$i<$numNames;$i++)
+			{
+				$len = ord($this->Read(1));
+				$names[] = $this->Read($len);
+			}
+			foreach($glyphNameIndex as $i=>$index)
+			{
+				if($index>=258)
+					$this->glyphs[$i]['name'] = $names[$index-258];
+				else
+					$this->glyphs[$i]['name'] = $index;
+			}
+			$this->glyphNames = true;
+		}
+		else
+			$this->glyphNames = false;
+	}
+
+	function Subset($chars)
+	{
+/*		$chars = array_keys($this->chars);
+		$this->subsettedChars = $chars;
+		$this->subsettedGlyphs = array();
+		for($i=0;$i<$this->numGlyphs;$i++)
+		{
+			$this->subsettedGlyphs[] = $i;
+			$this->glyphs[$i]['ssid'] = $i;
+		}*/
+
+		$this->AddGlyph(0);
+		$this->subsettedChars = array();
+		foreach($chars as $char)
+		{
+			if(isset($this->chars[$char]))
+			{
+				$this->subsettedChars[] = $char;
+				$this->AddGlyph($this->chars[$char]);
+			}
+		}
+	}
+
+	function AddGlyph($id)
+	{
+		if(!isset($this->glyphs[$id]['ssid']))
+		{
+			$this->glyphs[$id]['ssid'] = count($this->subsettedGlyphs);
+			$this->subsettedGlyphs[] = $id;
+			if(isset($this->glyphs[$id]['components']))
+			{
+				foreach($this->glyphs[$id]['components'] as $cid)
+					$this->AddGlyph($cid);
+			}
+		}
+	}
+
+	function Build()
+	{
+		$this->BuildCmap();
+		$this->BuildHhea();
+		$this->BuildHmtx();
+		$this->BuildLoca();
+		$this->BuildGlyf();
+		$this->BuildMaxp();
+		$this->BuildPost();
+		return $this->BuildFont();
+	}
+
+	function BuildCmap()
+	{
+		if(!isset($this->subsettedChars))
+			return;
+
+		// Divide charset in contiguous segments
+		$chars = $this->subsettedChars;
+		sort($chars);
+		$segments = array();
+		$segment = array($chars[0], $chars[0]);
+		for($i=1;$i<count($chars);$i++)
+		{
+			if($chars[$i]>$segment[1]+1)
+			{
+				$segments[] = $segment;
+				$segment = array($chars[$i], $chars[$i]);
+			}
+			else
+				$segment[1]++;
+		}
+		$segments[] = $segment;
+		$segments[] = array(0xFFFF, 0xFFFF);
+		$segCount = count($segments);
+
+		// Build a Format 4 subtable
+		$startCount = array();
+		$endCount = array();
+		$idDelta = array();
+		$idRangeOffset = array();
+		$glyphIdArray = '';
+		for($i=0;$i<$segCount;$i++)
+		{
+			list($start, $end) = $segments[$i];
+			$startCount[] = $start;
+			$endCount[] = $end;
+			if($start!=$end)
+			{
+				// Segment with multiple chars
+				$idDelta[] = 0;
+				$idRangeOffset[] = strlen($glyphIdArray) + ($segCount-$i)*2;
+				for($c=$start;$c<=$end;$c++)
+				{
+					$ssid = $this->glyphs[$this->chars[$c]]['ssid'];
+					$glyphIdArray .= pack('n', $ssid);
+				}
+			}
+			else
+			{
+				// Segment with a single char
+				if($start<0xFFFF)
+					$ssid = $this->glyphs[$this->chars[$start]]['ssid'];
+				else
+					$ssid = 0;
+				$idDelta[] = $ssid - $start;
+				$idRangeOffset[] = 0;
+			}
+		}
+		$entrySelector = 0;
+		$n = $segCount;
+		while($n!=1)
+		{
+			$n = $n>>1;
+			$entrySelector++;
+		}
+		$searchRange = (1<<$entrySelector)*2;
+		$rangeShift = 2*$segCount - $searchRange;
+		$cmap = pack('nnnn', 2*$segCount, $searchRange, $entrySelector, $rangeShift);
+		foreach($endCount as $val)
+			$cmap .= pack('n', $val);
+		$cmap .= pack('n', 0); // reservedPad
+		foreach($startCount as $val)
+			$cmap .= pack('n', $val);
+		foreach($idDelta as $val)
+			$cmap .= pack('n', $val);
+		foreach($idRangeOffset as $val)
+			$cmap .= pack('n', $val);
+		$cmap .= $glyphIdArray;
+
+		$data = pack('nn', 0, 1); // version, numTables
+		$data .= pack('nnN', 3, 1, 12); // platformID, encodingID, offset
+		$data .= pack('nnn', 4, 6+strlen($cmap), 0); // format, length, language
+		$data .= $cmap;
+		$this->SetTable('cmap', $data);
+	}
+
+	function BuildHhea()
+	{
+		$this->LoadTable('hhea');
+		$numberOfHMetrics = count($this->subsettedGlyphs);
+		$data = substr_replace($this->tables['hhea']['data'], pack('n',$numberOfHMetrics), 4+15*2, 2);
+		$this->SetTable('hhea', $data);
+	}
+
+	function BuildHmtx()
+	{
+		$data = '';
+		foreach($this->subsettedGlyphs as $id)
+		{
+			$glyph = $this->glyphs[$id];
+			$data .= pack('nn', $glyph['w'], $glyph['lsb']);
+		}
+		$this->SetTable('hmtx', $data);
+	}
+
+	function BuildLoca()
+	{
+		$data = '';
+		$offset = 0;
+		foreach($this->subsettedGlyphs as $id)
+		{
+			if($this->indexToLocFormat==0)
+				$data .= pack('n', $offset/2);
+			else
+				$data .= pack('N', $offset);
+			$offset += $this->glyphs[$id]['length'];
+		}
+		if($this->indexToLocFormat==0)
+			$data .= pack('n', $offset/2);
+		else
+			$data .= pack('N', $offset);
+		$this->SetTable('loca', $data);
+	}
+
+	function BuildGlyf()
+	{
+		$tableOffset = $this->tables['glyf']['offset'];
+		$data = '';
+		foreach($this->subsettedGlyphs as $id)
+		{
+			$glyph = $this->glyphs[$id];
+			fseek($this->f, $tableOffset+$glyph['offset'], SEEK_SET);
+			$glyph_data = $this->Read($glyph['length']);
+			if(isset($glyph['components']))
+			{
+				// Composite glyph
+				foreach($glyph['components'] as $offset=>$cid)
+				{
+					$ssid = $this->glyphs[$cid]['ssid'];
+					$glyph_data = substr_replace($glyph_data, pack('n',$ssid), $offset, 2);
+				}
+			}
+			$data .= $glyph_data;
+		}
+		$this->SetTable('glyf', $data);
+	}
+
+	function BuildMaxp()
+	{
+		$this->LoadTable('maxp');
+		$numGlyphs = count($this->subsettedGlyphs);
+		$data = substr_replace($this->tables['maxp']['data'], pack('n',$numGlyphs), 4, 2);
+		$this->SetTable('maxp', $data);
+	}
+
+	function BuildPost()
+	{
+		$this->Seek('post');
+		if($this->glyphNames)
+		{
+			// Version 2.0
+			$numberOfGlyphs = count($this->subsettedGlyphs);
+			$numNames = 0;
+			$names = '';
+			$data = $this->Read(2*4+2*2+5*4);
+			$data .= pack('n', $numberOfGlyphs);
+			foreach($this->subsettedGlyphs as $id)
+			{
+				$name = $this->glyphs[$id]['name'];
+				if(is_string($name))
+				{
+					$data .= pack('n', 258+$numNames);
+					$names .= chr(strlen($name)).$name;
+					$numNames++;
+				}
+				else
+					$data .= pack('n', $name);
+			}
+			$data .= $names;
+		}
+		else
+		{
+			// Version 3.0
+			$this->Skip(4);
+			$data = "\x00\x03\x00\x00";
+			$data .= $this->Read(4+2*2+5*4);
+		}
+		$this->SetTable('post', $data);
+	}
+
+	function BuildFont()
+	{
+		$tags = array();
+		foreach(array('cmap', 'cvt ', 'fpgm', 'glyf', 'head', 'hhea', 'hmtx', 'loca', 'maxp', 'name', 'post', 'prep') as $tag)
+		{
+			if(isset($this->tables[$tag]))
+				$tags[] = $tag;
+		}
+		$numTables = count($tags);
+		$offset = 12 + 16*$numTables;
+		foreach($tags as $tag)
+		{
+			if(!isset($this->tables[$tag]['data']))
+				$this->LoadTable($tag);
+			$this->tables[$tag]['offset'] = $offset;
+			$offset += strlen($this->tables[$tag]['data']);
+		}
+//		$this->tables['head']['data'] = substr_replace($this->tables['head']['data'], "\x00\x00\x00\x00", 8, 4);
+
+		// Build offset table
+		$entrySelector = 0;
+		$n = $numTables;
+		while($n!=1)
+		{
+			$n = $n>>1;
+			$entrySelector++;
+		}
+		$searchRange = 16*(1<<$entrySelector);
+		$rangeShift = 16*$numTables - $searchRange;
+		$offsetTable = pack('nnnnnn', 1, 0, $numTables, $searchRange, $entrySelector, $rangeShift);
+		foreach($tags as $tag)
+		{
+			$table = $this->tables[$tag];
+			$offsetTable .= $tag.$table['checkSum'].pack('NN', $table['offset'], $table['length']);
+		}
+
+		// Compute checkSumAdjustment (0xB1B0AFBA - font checkSum)
+		$s = $this->CheckSum($offsetTable);
+		foreach($tags as $tag)
+			$s .= $this->tables[$tag]['checkSum'];
+		$a = unpack('n2', $this->CheckSum($s));
+		$high = 0xB1B0 + ($a[1]^0xFFFF);
+		$low = 0xAFBA + ($a[2]^0xFFFF) + 1;
+		$checkSumAdjustment = pack('nn', $high+($low>>16), $low);
+		$this->tables['head']['data'] = substr_replace($this->tables['head']['data'], $checkSumAdjustment, 8, 4);
+
+		$font = $offsetTable;
+		foreach($tags as $tag)
+			$font .= $this->tables[$tag]['data'];
+
+		return $font;
+	}
+
+	function LoadTable($tag)
+	{
+		$this->Seek($tag);
+		$length = $this->tables[$tag]['length'];
+		$n = $length % 4;
+		if($n>0)
+			$length += 4 - $n;
+		$this->tables[$tag]['data'] = $this->Read($length);
+	}
+
+	function SetTable($tag, $data)
+	{
+		$length = strlen($data);
+		$n = $length % 4;
+		if($n>0)
+			$data = str_pad($data, $length+4-$n, "\x00");
+		$this->tables[$tag]['data'] = $data;
+		$this->tables[$tag]['length'] = $length;
+		$this->tables[$tag]['checkSum'] = $this->CheckSum($data);
+	}
+
+	function Seek($tag)
+	{
+		if(!isset($this->tables[$tag]))
+			$this->Error('Table not found: '.$tag);
+		fseek($this->f, $this->tables[$tag]['offset'], SEEK_SET);
+	}
+
+	function Skip($n)
+	{
+		fseek($this->f, $n, SEEK_CUR);
+	}
+
+	function Read($n)
+	{
+		return $n>0 ? fread($this->f, $n) : '';
+	}
+
+	function ReadUShort()
+	{
+		$a = unpack('nn', fread($this->f,2));
+		return $a['n'];
+	}
+
+	function ReadShort()
+	{
+		$a = unpack('nn', fread($this->f,2));
+		$v = $a['n'];
+		if($v>=0x8000)
+			$v -= 65536;
+		return $v;
+	}
+
+	function ReadULong()
+	{
+		$a = unpack('NN', fread($this->f,4));
+		return $a['N'];
+	}
+
+	function CheckSum($s)
+	{
+		$n = strlen($s);
+		$high = 0;
+		$low = 0;
+		for($i=0;$i<$n;$i+=4)
+		{
+			$high += (ord($s[$i])<<8) + ord($s[$i+1]);
+			$low += (ord($s[$i+2])<<8) + ord($s[$i+3]);
+		}
+		return pack('nn', $high+($low>>16), $low);
+	}
+
+	function Error($msg)
+	{
+		throw new Exception($msg);
+	}
+}
+?>
-- 
cgit