290 lines
7.1 KiB
PHP
Executable File
290 lines
7.1 KiB
PHP
Executable File
<?php
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/*******************************************************************************
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* Utility to parse TTF font files *
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* *
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* Version: 1.0 *
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* Date: 2011-06-18 *
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* Author: Olivier PLATHEY *
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*******************************************************************************/
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class TTFParser
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{
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var $f;
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var $tables;
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var $unitsPerEm;
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var $xMin, $yMin, $xMax, $yMax;
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var $numberOfHMetrics;
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var $numGlyphs;
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var $widths;
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var $chars;
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var $postScriptName;
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var $Embeddable;
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var $Bold;
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var $typoAscender;
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var $typoDescender;
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var $capHeight;
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var $italicAngle;
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var $underlinePosition;
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var $underlineThickness;
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var $isFixedPitch;
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function Parse($file)
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{
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$this->f = fopen($file, 'rb');
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if(!$this->f)
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$this->Error('Can\'t open file: '.$file);
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$version = $this->Read(4);
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if($version=='OTTO')
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$this->Error('OpenType fonts based on PostScript outlines are not supported');
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if($version!="\x00\x01\x00\x00")
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$this->Error('Unrecognized file format');
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$numTables = $this->ReadUShort();
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$this->Skip(3*2); // searchRange, entrySelector, rangeShift
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$this->tables = array();
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for($i=0;$i<$numTables;$i++)
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{
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$tag = $this->Read(4);
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$this->Skip(4); // checkSum
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$offset = $this->ReadULong();
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$this->Skip(4); // length
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$this->tables[$tag] = $offset;
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}
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$this->ParseHead();
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$this->ParseHhea();
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$this->ParseMaxp();
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$this->ParseHmtx();
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$this->ParseCmap();
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$this->ParseName();
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$this->ParseOS2();
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$this->ParsePost();
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fclose($this->f);
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}
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function ParseHead()
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{
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$this->Seek('head');
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$this->Skip(3*4); // version, fontRevision, checkSumAdjustment
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$magicNumber = $this->ReadULong();
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if($magicNumber!=0x5F0F3CF5)
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$this->Error('Incorrect magic number');
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$this->Skip(2); // flags
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$this->unitsPerEm = $this->ReadUShort();
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$this->Skip(2*8); // created, modified
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$this->xMin = $this->ReadShort();
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$this->yMin = $this->ReadShort();
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$this->xMax = $this->ReadShort();
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$this->yMax = $this->ReadShort();
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}
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function ParseHhea()
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{
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$this->Seek('hhea');
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$this->Skip(4+15*2);
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$this->numberOfHMetrics = $this->ReadUShort();
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}
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function ParseMaxp()
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{
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$this->Seek('maxp');
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$this->Skip(4);
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$this->numGlyphs = $this->ReadUShort();
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}
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function ParseHmtx()
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{
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$this->Seek('hmtx');
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$this->widths = array();
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for($i=0;$i<$this->numberOfHMetrics;$i++)
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{
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$advanceWidth = $this->ReadUShort();
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$this->Skip(2); // lsb
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$this->widths[$i] = $advanceWidth;
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}
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if($this->numberOfHMetrics<$this->numGlyphs)
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{
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$lastWidth = $this->widths[$this->numberOfHMetrics-1];
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$this->widths = array_pad($this->widths, $this->numGlyphs, $lastWidth);
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}
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}
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function ParseCmap()
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{
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$this->Seek('cmap');
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$this->Skip(2); // version
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$numTables = $this->ReadUShort();
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$offset31 = 0;
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for($i=0;$i<$numTables;$i++)
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{
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$platformID = $this->ReadUShort();
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$encodingID = $this->ReadUShort();
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$offset = $this->ReadULong();
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if($platformID==3 && $encodingID==1)
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$offset31 = $offset;
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}
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if($offset31==0)
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$this->Error('No Unicode encoding found');
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$startCount = array();
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$endCount = array();
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$idDelta = array();
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$idRangeOffset = array();
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$this->chars = array();
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fseek($this->f, $this->tables['cmap']+$offset31, SEEK_SET);
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$format = $this->ReadUShort();
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if($format!=4)
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$this->Error('Unexpected subtable format: '.$format);
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$this->Skip(2*2); // length, language
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$segCount = $this->ReadUShort()/2;
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$this->Skip(3*2); // searchRange, entrySelector, rangeShift
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for($i=0;$i<$segCount;$i++)
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$endCount[$i] = $this->ReadUShort();
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$this->Skip(2); // reservedPad
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for($i=0;$i<$segCount;$i++)
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$startCount[$i] = $this->ReadUShort();
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for($i=0;$i<$segCount;$i++)
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$idDelta[$i] = $this->ReadShort();
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$offset = ftell($this->f);
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for($i=0;$i<$segCount;$i++)
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$idRangeOffset[$i] = $this->ReadUShort();
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for($i=0;$i<$segCount;$i++)
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{
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$c1 = $startCount[$i];
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$c2 = $endCount[$i];
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$d = $idDelta[$i];
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$ro = $idRangeOffset[$i];
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if($ro>0)
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fseek($this->f, $offset+2*$i+$ro, SEEK_SET);
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for($c=$c1;$c<=$c2;$c++)
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{
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if($c==0xFFFF)
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break;
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if($ro>0)
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{
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$gid = $this->ReadUShort();
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if($gid>0)
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$gid += $d;
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}
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else
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$gid = $c+$d;
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if($gid>=65536)
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$gid -= 65536;
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if($gid>0)
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$this->chars[$c] = $gid;
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}
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}
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}
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function ParseName()
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{
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$this->Seek('name');
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$tableOffset = ftell($this->f);
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$this->postScriptName = '';
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$this->Skip(2); // format
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$count = $this->ReadUShort();
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$stringOffset = $this->ReadUShort();
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for($i=0;$i<$count;$i++)
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{
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$this->Skip(3*2); // platformID, encodingID, languageID
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$nameID = $this->ReadUShort();
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$length = $this->ReadUShort();
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$offset = $this->ReadUShort();
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if($nameID==6)
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{
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// PostScript name
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fseek($this->f, $tableOffset+$stringOffset+$offset, SEEK_SET);
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$s = $this->Read($length);
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$s = str_replace(chr(0), '', $s);
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$s = preg_replace('|[ \[\](){}<>/%]|', '', $s);
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$this->postScriptName = $s;
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break;
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}
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}
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if($this->postScriptName=='')
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$this->Error('PostScript name not found');
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}
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function ParseOS2()
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{
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$this->Seek('OS/2');
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$version = $this->ReadUShort();
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$this->Skip(3*2); // xAvgCharWidth, usWeightClass, usWidthClass
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$fsType = $this->ReadUShort();
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$this->Embeddable = ($fsType!=2) && ($fsType & 0x200)==0;
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$this->Skip(11*2+10+4*4+4);
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$fsSelection = $this->ReadUShort();
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$this->Bold = ($fsSelection & 32)!=0;
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$this->Skip(2*2); // usFirstCharIndex, usLastCharIndex
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$this->typoAscender = $this->ReadShort();
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$this->typoDescender = $this->ReadShort();
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if($version>=2)
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{
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$this->Skip(3*2+2*4+2);
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$this->capHeight = $this->ReadShort();
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}
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else
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$this->capHeight = 0;
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}
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function ParsePost()
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{
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$this->Seek('post');
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$this->Skip(4); // version
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$this->italicAngle = $this->ReadShort();
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$this->Skip(2); // Skip decimal part
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$this->underlinePosition = $this->ReadShort();
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$this->underlineThickness = $this->ReadShort();
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$this->isFixedPitch = ($this->ReadULong()!=0);
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}
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function Error($msg)
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{
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if(PHP_SAPI=='cli')
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die("Error: $msg\n");
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else
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die("<b>Error</b>: $msg");
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}
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function Seek($tag)
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{
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if(!isset($this->tables[$tag]))
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$this->Error('Table not found: '.$tag);
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fseek($this->f, $this->tables[$tag], SEEK_SET);
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}
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function Skip($n)
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{
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fseek($this->f, $n, SEEK_CUR);
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}
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function Read($n)
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{
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return fread($this->f, $n);
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}
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function ReadUShort()
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{
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$a = unpack('nn', fread($this->f,2));
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return $a['n'];
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}
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function ReadShort()
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{
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$a = unpack('nn', fread($this->f,2));
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$v = $a['n'];
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if($v>=0x8000)
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$v -= 65536;
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return $v;
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}
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function ReadULong()
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{
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$a = unpack('NN', fread($this->f,4));
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return $a['N'];
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}
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}
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?>
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