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sfnt.class.php
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sfnt.class.php
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<?php
/*
* sfnt.class.php - a php class for parsing sfnt and opentype fonts
*
* Copyright 2011 Olivier Berten <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
# Based on the OpenType file format specification http://www.microsoft.com/typography/otspec/otff.htm
class sfnt {
function __construct($fontfile) {
// Opening the file
if (file_exists($fontfile)) {
$this->fh = fopen($fontfile, 'rb');
} else {
die("Cannot open file $fontfile");
}
// Reading the Offset Table
fseek($this->fh, 0);
$sfntVersion = $this->read_Fixed();
if(in_array($sfntVersion, array('1.0','2.0','true','OTTO','typ1',chr(0xA5).'kbd',chr(0xA5).'lst'))) {
$numTables = $this->read_USHORT();
$searchRange = $this->read_USHORT();
$entrySelector = $this->read_USHORT();
$rangeShift = $this->read_USHORT();
// Reading the Table Directory
$this->TableDirectory[0] = array();
for($i = 0; $i < $numTables; $i++) {
$this->TableDirectory[0][$this->read_Tag()] = array('checkSum' => $this->read_ULONG(), 'offset' => $this->read_ULONG(), 'length' => $this->read_ULONG());
}
$this->sfntVersion = array($sfntVersion,);
} elseif($sfntVersion == 'ttcf') {
$ttcVersion = $this->read_Fixed();
$numFonts = $this->read_ULONG();
for($i = 0; $i < $numFonts; $i++) {
$OffsetTable[] = $this->read_ULONG();
}
if($ttcVersion == '2.0') {
$ulDsigTag = $this->read_ULONG();
$ulDsigLength = $this->read_ULONG();
$ulDsigOffset = $this->read_ULONG();
}
$this->TableDirectory = array();
$i = 0;
foreach($OffsetTable as $o) {
fseek($this->fh, $o);
$sfntVersion = $this->read_Fixed();
$numTables = $this->read_USHORT();
$searchRange = $this->read_USHORT();
$entrySelector = $this->read_USHORT();
$rangeShift = $this->read_USHORT();
// Reading the Table Directory
for($j = 0; $j < $numTables; $j++) {
$this->TableDirectory[$i][$this->read_Tag()] = array('checkSum' => $this->read_ULONG(), 'offset' => $this->read_ULONG(), 'length' => $this->read_ULONG());
}
$this->sfntVersion[$i] = $sfntVersion;
$i++;
}
} else {
die("The file $fontfile does not seem to be a sfnt font.");
}
# print_r($this->TableDirectory);
}
function __destruct() {
if(isset($this->fh)) {
fclose($this->fh);
}
}
function unichr($dec) {
if ($dec < 128) {
$utf = chr($dec);
} else if ($dec < 2048) {
$utf = chr(192 + (($dec - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
} else {
$utf = chr(224 + (($dec - ($dec % 4096)) / 4096));
$utf .= chr(128 + ((($dec % 4096) - ($dec % 64)) / 64));
$utf .= chr(128 + ($dec % 64));
}
return $utf;
}
function read_BYTE($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_BYTE();
}
return $list;
} else {
$data = unpack('C', fread($this->fh, 1));
return $data[1];
}
}
function read_CHAR($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_CHAR();
}
return $list;
} else {
$data = unpack('c', fread($this->fh, 1));
return $data[1];
}
}
function read_USHORT($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_USHORT();
}
return $list;
} else {
$data = unpack('n', fread($this->fh, 2));
return $data[1];
}
}
function read_SHORT($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_SHORT();
}
return $list;
} else {
$data = unpack('n', fread($this->fh, 2));
# There's no big-endian signed short in php's unpack function
if($data[1] >= pow(2, 15)) {
return $data[1] - pow(2, 16);
} else {
return $data[1];
}
}
}
function read_UINT24() {
# return hexdec($this->read_HEX(3));
return $this->read_HEX(3);
}
function read_ULONG($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_ULONG();
}
return $list;
} else {
$data = unpack('N', fread($this->fh, 4));
return $data[1];
}
}
function read_LONG() {
$data = unpack('N', fread($this->fh, 4));
# There's no big-endian signed long in php's unpack function
if($data[1] > 0x7FFFFFFF) {
return $data[1] - 0xFFFFFFFF;
} else {
return $data[1];
}
}
function read_LONGDATETIME() {
# There's no 64-bit integer in php's unpack function
# $data = unpack('H16', fread($this->fh, 8));
# return hexdec($data[1]);
$data = unpack('H8/H8', fread($this->fh, 8)); # No font was created after 2038 ;-)
if(hexdec($data[1]) >= 2082840000) {
# OpenType/TrueType/MacOS tells dates from January 1, 1904 while POSIX/php tells from January 1, 1970
return hexdec($data[1])-2082844800;
} else {
# but some fonts have the date encoded in POSIX time though and I guess no truetype font was ever created before 1970...
return hexdec($data[1]);
}
}
function read_Fixed() {
$data = fread($this->fh, 4);
$f = unpack('nMajor/H4Minor', $data);
$Major = $f['Major'];
$Minor = hexdec($f['Minor'][0]);
if(in_array($Major, array(29810, 20308, 29817, 29812, 42347, 42348))) {
return $data;
} else {
if($Major > 0x7FFF) { # for $maxp['italicAngle']
return ($Major - 0xFFFF).'.'.$Minor;
} else {
return $Major.'.'.$Minor;
}
}
}
function read_Tag() {
return fread($this->fh, 4);
}
function read_GlyphID($nb = false) {
return $this->read_USHORT($nb);
}
function read_Offset($nb = false) {
return $this->read_USHORT($nb);
}
function read_uint16($nb = false) {
return $this->read_USHORT($nb);
}
function read_int16($nb = false) {
return $this->read_SHORT($nb);
}
function read_FWord($nb = false) {
return $this->read_SHORT($nb);
}
function read_PascalString($nb = false) {
if(is_int($nb)) {
$list = array();
for($i = 0; $i < $nb; $i++) {
$list[] = $this->read_PascalString();
}
return $list;
} else {
$length = $this->read_BYTE();
if ($length > 0) {
return fread($this->fh, $length);
} else {
return '';
}
}
}
function read_HEX($bytes = 1) {
$data = unpack('H'.($bytes*2), fread($this->fh, $bytes));
return $data[1];
}
function read_Flag($bytes = 1) {
#return hexdec($this->read_HEX($bytes));
return str_split(strrev(str_pad(decbin(hexdec($this->read_HEX($bytes))),$bytes*8,'0',STR_PAD_LEFT)));
}
function read_StateHeader() {
$stHeader['stateSize'] = $this->read_USHORT();
$stHeader['classTable'] = $this->read_USHORT();
$stHeader['stateArray'] = $this->read_USHORT();
$stHeader['entryTable'] = $this->read_USHORT();
return($stHeader);
}
function read_StateHeaderExtended() {
$stHeaderX['nClasses'] = $this->read_ULONG();
$stHeaderX['classTableOffset'] = $this->read_ULONG();
$stHeaderX['stateArrayOffset'] = $this->read_ULONG();
$stHeaderX['entryTableOffset'] = $this->read_ULONG();
return($stHeaderX);
}
function read_StateTableX($stHeaderX) {
}
function read_AATLookupTable() {
$lookupTable['format'] = $format = $this->read_USHORT();
switch($format) {
case 0: # Simple array format
$fsHeader = "TODO (Simple array format)";
break;
case 2: # Segment single format
$fsHeader = "TODO (Segment single format)";
break;
case 4: # Segment array format
$fsHeader = "TODO (Segment array format)";
break;
case 6: # Single table format
$fsHeader = "TODO (Simple array format)";
break;
case 8: # Trimmed array format
$fsHeader['firstGlyph'] = $this->read_USHORT();
$fsHeader['glyphCount'] = $this->read_USHORT();
for($i = 0; $i < $fsHeader['glyphCount']; $i++) {
$fsHeader['valueArray'][] = $this->read_USHORT();
}
}
$lookupTable['fsHeader'] = $fsHeader;
return $lookupTable;
}
function list_tables($ttc_font = 0) {
return array_keys($this->TableDirectory[$ttc_font]);
}
function table($tag, $ttc_font = 0) {
if(!isset($this->TableDirectory[$ttc_font][$tag]) || $this->TableDirectory[$ttc_font][$tag]['length'] == 0) return false;
switch(trim($tag)) {
case 'name':
return $this->table_name($ttc_font);
case 'cmap':
return $this->table_cmap($ttc_font);
case 'GSUB':
return $this->table_gposgsub($tag, $ttc_font);
case 'GPOS':
return $this->table_gposgsub($tag, $ttc_font);
case 'GDEF':
return $this->table_gdef($ttc_font);
case 'head':
return $this->table_head($ttc_font);
case 'maxp':
return $this->table_maxp($ttc_font);
case 'post':
return $this->table_post($ttc_font);
case 'OS/2':
return $this->table_os2($ttc_font);
case 'kern':
return $this->table_kern($ttc_font);
case 'feat':
return $this->table_feat($ttc_font);
case 'mort':
return $this->table_mort($ttc_font);
case 'morx':
return $this->table_morx($ttc_font);
default:
return 'TODO';
}
}
function table_name($ttc_font = 0) {
# from http://www.microsoft.com/typography/otspec/name.htm
fseek($this->fh, $this->TableDirectory[$ttc_font]['name']['offset']);
$format = $this->read_USHORT();
$count = $this->read_USHORT();
$stringOffset = $this->read_USHORT();
$nameRecords = array();
for($i = 0; $i < $count; $i++) {
$nameRecords[$i] = array('platformID' => $this->read_USHORT(), 'encodingID' => $this->read_USHORT(), 'languageID' => $this->read_USHORT(), 'nameID' => $this->read_USHORT(), 'length' => $this->read_USHORT(), 'offset' => $this->read_USHORT());
}
$langTagRecords = array();
if($format == 1) {
$langTagCount = $this->read_USHORT();
for($i = 0; $i < $langTagCount; $i++) {
$langTagRecords[$i] = array('length' => $this->read_USHORT(), 'offset' => $this->read_USHORT());
}
}
for($i = 0; $i < count($langTagRecords); $i++) {
fseek($this->fh, $this->TableDirectory[$ttc_font]['name']['offset']+$stringOffset+$langTagRecords[$i]['offset']);
$data = fread($this->fh, $langTagRecords[$i]['length']);
$langTagRecords[$i] = iconv('UTF-16BE','UTF-8',$data);
}
for($i = 0; $i < count($nameRecords); $i++) {
fseek($this->fh, $this->TableDirectory[$ttc_font]['name']['offset']+$stringOffset+$nameRecords[$i]['offset']);
if($nameRecords[$i]['length'] > 0) {
$nameRecords[$i]['data'] = fread($this->fh, $nameRecords[$i]['length']);
} else {
$nameRecords[$i]['data'] = '';
}
unset($nameRecords[$i]['offset']);
unset($nameRecords[$i]['length']);
}
return array('format' => $format, 'names' => $nameRecords, 'langTags' => $langTagRecords);
}
function table_cmap($ttc_font = 0) {
# from http://www.microsoft.com/typography/otspec/cmap.htm
fseek($this->fh, $this->TableDirectory[$ttc_font]['cmap']['offset']);
$version = $this->read_USHORT();
if($version != 0) return array();
$numTables = $this->read_USHORT();
$encodingRecords = array();
for($i = 0; $i < $numTables; $i++) {
$encodingRecords[$i] = array('platformID' => $this->read_USHORT(), 'encodingID' => $this->read_USHORT(), 'offset' => $this->read_ULONG());
}
for($i = 0; $i < count($encodingRecords); $i++) {
$subTableOffset = $this->TableDirectory[$ttc_font]['cmap']['offset']+$encodingRecords[$i]['offset'];
fseek($this->fh, $subTableOffset);
$format = $this->read_USHORT();
switch($format) {
case 0: # Format 0: Byte encoding table
$encodingRecords[$i]['format'] = $format;
$length = $this->read_USHORT();
$encodingRecords[$i]['language'] = $this->read_USHORT();
$encodingRecords[$i]['cmap'] = array_filter($this->read_BYTE(256));
unset($encodingRecords[$i]['offset']);
break;
case 2: # Format 2: High-byte mapping through table
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format;
$length = $this->read_USHORT();
$encodingRecords[$i]['language'] = $this->read_USHORT();
$subHeaderKeys = $this->read_USHORT(256);
$subHeaders = array();
foreach($subHeaderKeys as $key) {
if($key > 0) {
$firstCode = $this->read_USHORT();
$entryCount = $this->read_USHORT();
$idDelta = $this->read_SHORT();
$idRangeOffset = $this->read_USHORT();
$pos = ftell($this->fh);
fseek($this->fh, $pos - 2 + $idRangeOffset);
$subHeaders[$key/8] = array('firstCode' => $firstCode, 'idDelta' => $idDelta, 'glyphIndexArray' => $this->read_USHORT($entryCount));
fseek($this->fh, $pos);
}
}
$firstCode = $this->read_USHORT();
$entryCount = $this->read_USHORT();
$idDelta = $this->read_SHORT();
$idRangeOffset = $this->read_USHORT();
$subHeaders[0] = array('firstCode' => $firstCode, 'idDelta' => $idDelta, 'glyphIndexArray' => $this->read_USHORT($entryCount));
unset($encodingRecords[$i]['offset']);
$encodingRecords[$i]['subHeaderKeys'] = $subHeaderKeys;
$encodingRecords[$i]['subHeaders'] = $subHeaders;
$encodingRecords[$i]['cmap'] = "TODO";
break;
case 4: # Format 4: Segment mapping to delta values
$encodingRecords[$i]['format'] = $format;
$length = $this->read_USHORT();
$encodingRecords[$i]['language'] = $this->read_USHORT();
$segCountX2 = $this->read_USHORT();
$segCount = $segCountX2 / 2;
$searchRange = $this->read_USHORT();
$entrySelector = $this->read_USHORT();
$rangeShift = $this->read_USHORT();
$endCount = $this->read_USHORT($segCount);
$reservedPad = $this->read_USHORT();
$startCount = $this->read_USHORT($segCount);
$idDelta = $this->read_SHORT($segCount);
$idRangeOffset = $this->read_USHORT($segCount);
$leftover = $length - 16 - $segCount*8;
$glyphIdArray = $this->read_USHORT($leftover/2);
$cmap = array();
for($j = 0; $j < $segCount; $j++) {
for($c = $startCount[$j]; $c <= $endCount[$j]; $c++) {
if($c != 0xFFFF) {
if($idRangeOffset[$j] == 0) {
$cmap[$c] = (($c + $idDelta[$j]) % 65536);
} else {
$o = ($idRangeOffset[$j]/2 + ($c - $startCount[$j])) - ($segCount - $j);
$cmap[$c] = $glyphIdArray[$o];
}
}
}
}
$encodingRecords[$i]['cmap'] = array_filter($cmap);
unset($encodingRecords[$i]['offset']);
break;
case 6: # Format 6: Trimmed table mapping
$encodingRecords[$i]['format'] = $format;
$length = $this->read_USHORT();
$encodingRecords[$i]['language'] = $this->read_USHORT();
$firstCode = $this->read_USHORT();
$entryCount = $this->read_USHORT();
$glyphIdArray = $this->read_USHORT($entryCount);
$cmap = array();
for($j = 0; $j < $entryCount; $j++) {
$cmap[$j + $firstCode] = $glyphIdArray[$j];
}
$encodingRecords[$i]['cmap'] = array_filter($cmap);
unset($encodingRecords[$i]['offset']);
break;
case 8: # Format 8: mixed 16-bit and 32-bit coverage
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format.'.'.$this->read_USHORT();
$length = $this->read_ULONG();
$encodingRecords[$i]['language'] = $this->read_ULONG();
$encodingRecords[$i]['cmap'] = "TODO";
unset($encodingRecords[$i]['offset']);
break;
case 10: # Format 10: Trimmed array
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format.'.'.$this->read_USHORT();
$length = $this->read_ULONG();
$encodingRecords[$i]['language'] = $this->read_ULONG();
$encodingRecords[$i]['cmap'] = "TODO";
unset($encodingRecords[$i]['offset']);
break;
case 12: # Format 12: Segmented coverage
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format.'.'.$this->read_USHORT();
$length = $this->read_ULONG();
$encodingRecords[$i]['language'] = $this->read_ULONG();
$encodingRecords[$i]['cmap'] = "TODO";
unset($encodingRecords[$i]['offset']);
break;
case 13: # Format 13: Many-to-one range mappings
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format.'.'.$this->read_USHORT();
$length = $this->read_ULONG();
$encodingRecords[$i]['language'] = $this->read_ULONG();
$encodingRecords[$i]['cmap'] = "TODO";
unset($encodingRecords[$i]['offset']);
break;
case 14: # Format 14: Unicode Variation Sequences
# TO BE COMPLETED
$encodingRecords[$i]['format'] = $format;
$length = $this->read_ULONG();
$numVarSelectorRecords = $this->read_ULONG();
$vsr = array();
for($j = 0; $j < $numVarSelectorRecords; $j++) {
$vsr[$j] = array();
$vsr[$j]['varSelector'] = $this->read_UINT24();
$vsr[$j]['defaultUVSOffset'] = $this->read_ULONG();
$vsr[$j]['nonDefaultUVSOffset'] = $this->read_ULONG();
}
$varSelectorRecords = array();
foreach($vsr as $v) {
$duvs = array();
if($v['defaultUVSOffset'] > 0) {
fseek($this->fh, $subTableOffset + $v['defaultUVSOffset']);
$numUnicodeValueRanges = $this->read_ULONG();
for($j = 0; $j < $numUnicodeValueRanges; $j++) {
$duvs[$j]['startUnicodeValue'] = $this->read_UINT24();
$duvs[$j]['additionalCount'] = $this->read_BYTE();
}
}
$nduvs = array();
if($v['nonDefaultUVSOffset'] > 0) {
fseek($this->fh, $subTableOffset + $v['nonDefaultUVSOffset']);
$numUVSMappings = $this->read_ULONG();
for($j = 0; $j < $numUVSMappings; $j++) {
$nduvs[$j]['unicodeValue'] = $this->read_UINT24();
$nduvs[$j]['glyphID'] = $this->read_USHORT();
}
}
$varSelectorRecords[] = array('varSelector' => $v['varSelector'], 'defaultUVS' => $duvs, 'nonDefaultUVS' => $nduvs);
}
$encodingRecords[$i]['varSelectorRecords'] = $varSelectorRecords;
$encodingRecords[$i]['cmap'] = "TODO";
unset($encodingRecords[$i]['offset']);
break;
}
}
return $encodingRecords;
}
function table_gdef($ttc_font = 0) {
# from http://www.microsoft.com/typography/otspec/GDEF.htm
fseek($this->fh, $this->TableDirectory[$ttc_font]['GDEF']['offset']);
$GDEF = array();
$GDEF['Version'] = $this->read_USHORT().'.'.$this->read_USHORT();
$GlyphClassDefOffset = $this->read_Offset();
$AttachListOffset = $this->read_Offset();
$LigCaretListOffset = $this->read_Offset();
$MarkAttachClassDefOffset = $this->read_Offset();
if($GDEF['Version'] == "1.2") {
$MarkGlyphSetsDefOffset = $this->read_Offset();
}
if($GlyphClassDefOffset > 0) {
$GDEF['GlyphClassDef'] = $this->read_Classes($this->TableDirectory[$ttc_font]['GDEF']['offset']+$GlyphClassDefOffset);
}
if($AttachListOffset > 0) {
$AttachListOffset = $this->TableDirectory[$ttc_font]['GDEF']['offset']+$AttachListOffset;
fseek($this->fh, $AttachListOffset);
$CoverageOffset = $this->read_Offset();
$GlyphCount = $this->read_uint16();
$AttachPointOffsets = $this->read_Offset($GlyphCount);
$Coverage = $this->read_Coverage($AttachListOffset+$CoverageOffset);
$AttachPoints = array();
for($i = 0; $i < $GlyphCount; $i++) {
fseek($this->fh, $AttachListOffset+$AttachPointOffsets[$i]);
$PointCount = $this->read_uint16();
$AttachPoints[$Coverage[$i]] = $this->read_uint16($PointCount);
}
$GDEF['AttachList'] = $AttachPoints;
}
if($LigCaretListOffset > 0) {
$LigCaretListOffset = $this->TableDirectory[$ttc_font]['GDEF']['offset']+$LigCaretListOffset;
fseek($this->fh, $LigCaretListOffset);
$CoverageOffset = $this->read_Offset();
$LigGlyphCount = $this->read_uint16();
$LigGlyphOffsets = $this->read_Offset($LigGlyphCount);
$Coverage = $this->read_Coverage($LigCaretListOffset+$CoverageOffset);
$LigCarets = array();
for($i = 0; $i < $LigGlyphCount; $i++) {
fseek($this->fh, $LigCaretListOffset+$LigGlyphOffsets[$i]);
$CaretCount = $this->read_uint16();
$CaretValueOffsets = $this->read_Offset($CaretCount);
$CaretValues = array();
foreach($CaretValueOffsets as $CaretValueOffset) {
fseek($this->fh, $LigCaretListOffset+$LigGlyphOffsets[$i]+$CaretValueOffset);
$CaretValueFormat = $this->read_uint16();
switch($CaretValueFormat) {
case 1: # Design units only
$CaretValues[] = array('Format' => $CaretValueFormat, 'Coordinate' => $this->read_int16());
break;
case 2: # Contour point
$CaretValues[] = array('Format' => $CaretValueFormat, 'ContourPoint' => $this->read_uint16());
break;
case 3: # Design units plus Device table
$fpos = ftell($this->fh);
$CaretValues[] = array('Format' => $CaretValueFormat, 'Coordinate' => $this->read_int16(), 'DeviceTable' => $this->read_DeviceTable($this->read_Offset()));
fseek($this->fh, $fpos+4);
break;
}
}
$LigCarets[$Coverage[$i]] = $CaretValues;
}
$GDEF['LigCaretList'] = $LigCarets;
}
if($MarkAttachClassDefOffset > 0) {
$GDEF['MarkAttachClassDef'] = $this->read_Classes($this->TableDirectory[$ttc_font]['GDEF']['offset']+$MarkAttachClassDefOffset);
}
if(isset($MarkGlyphSetsDefOffset) && $MarkGlyphSetsDefOffset > 0) {
$MarkGlyphSetsDefOffset = $this->TableDirectory[$ttc_font]['GDEF']['offset']+$MarkGlyphSetsDefOffset;
fseek($this->fh, $MarkGlyphSetsDefOffset);
$MarkSetCount = $this->read_uint16();
$MarkSetOffsets = $this->read_ULONG($MarkSetCount);
$MarkSets = array();
foreach($MarkSetOffsets as $MarkSetOffset) {
$MarkSets = $this->read_Coverage($MarkGlyphSetsDefOffset+$MarkSetOffset);
}
$GDEF['MarkGlyphSetsDef'] = $MarkSets;
}
return $GDEF;
}
function read_DeviceTable($offset) {
}
function table_gposgsub($tag, $ttc_font = 0) {
# from http://www.microsoft.com/typography/otspec/GPOS.htm
# from http://www.microsoft.com/typography/otspec/GSUB.htm
fseek($this->fh, $this->TableDirectory[$ttc_font][$tag]['offset']);
$version = $this->read_Fixed();
$ScriptListOffset = $this->TableDirectory[$ttc_font][$tag]['offset']+$this->read_Offset();
$FeatureListOffset = $this->TableDirectory[$ttc_font][$tag]['offset']+$this->read_Offset();
$LookupListOffset = $this->TableDirectory[$ttc_font][$tag]['offset']+$this->read_Offset();
# Script List
$ScriptList = array();
fseek($this->fh, $ScriptListOffset);
$ScriptCount = $this->read_uint16();
$ScriptRecords = array();
for($i = 0; $i < $ScriptCount; $i++) {
$ScriptRecords[$this->read_Tag()] = $this->read_Offset(); # To be checked: can a script code appear more than once?
}
$ScriptTable = array();
foreach($ScriptRecords as $ScriptTag => $ScriptOffset) {
$ScriptList[$ScriptTag] = array();
fseek($this->fh, $ScriptListOffset+$ScriptOffset);
$DefaultLangSysOffset = $this->read_Offset();
$LangSysCount = $this->read_uint16();
$LangSysRecordOffsets = array();
for($i = 0; $i < $LangSysCount; $i++) {
$LangSysRecordOffsets[$this->read_Tag()] = $this->read_Offset();
}
$LangSysTable = array();
if($DefaultLangSysOffset > 0) {
fseek($this->fh, $ScriptListOffset+$ScriptOffset+$DefaultLangSysOffset);
$LookupOrder = $this->read_Offset();
$ReqFeatureIndex = $this->read_uint16();
$FeatureCount = $this->read_uint16();
$ScriptList[$ScriptTag]['dflt'] = array('ReqFeatureIndex' => $ReqFeatureIndex, 'FeatureIndices' => $this->read_uint16($FeatureCount));
}
foreach($LangSysRecordOffsets as $LangSysTag => $LangSysOffset) {
fseek($this->fh, $ScriptListOffset+$ScriptOffset+$LangSysOffset);
$LookupOrder = $this->read_Offset();
$ReqFeatureIndex = $this->read_uint16();
$FeatureCount = $this->read_uint16();
$ScriptList[$ScriptTag][$LangSysTag] = array('ReqFeatureIndex' => $ReqFeatureIndex, 'FeatureIndices' => $this->read_uint16($FeatureCount));
}
}
# Feature List
$FeatureList = array();
fseek($this->fh, $FeatureListOffset);
$FeatureCount = $this->read_uint16();
$FeatureRecords = array();
for($i = 0; $i < $FeatureCount; $i++) {
$FeatureRecords[] = array($this->read_Tag(),$this->read_Offset());
}
foreach($FeatureRecords as $frec) {
fseek($this->fh, $FeatureListOffset+$frec[1]);
$FeatureParams = $this->read_Offset();
$LookupCount = $this->read_uint16();
$FeatureList[] = array('FeatureTag' => $frec[0], 'LookupListIndices' => $this->read_uint16($LookupCount));
}
# Lookup List
$LookupList = array();
fseek($this->fh, $LookupListOffset);
$LookupCount = $this->read_uint16();
$LookupTableOffsets = $this->read_uint16($LookupCount);
foreach($LookupTableOffsets as $LookupTableOffset) {
fseek($this->fh, $LookupListOffset+$LookupTableOffset);
$LookupType = $this->read_uint16();
$LookupFlag = $this->read_uint16();
$SubTableCount = $this->read_uint16();
$SubTableOffsets = $this->read_uint16($SubTableCount);
$MarkFilteringSet = $this->read_uint16();
$SubTables = array();
foreach($SubTableOffsets as $SubTableOffset) {
$Subtable = $this->read_OTLookupTable($tag,$LookupType,$LookupListOffset+$LookupTableOffset+$SubTableOffset);
if(isset($Subtable['ExtensionLookupType'])) {
$ExtensionLookupType = $Subtable['ExtensionLookupType'];
unset($Subtable['ExtensionLookupType']);
}
$SubTables[] = $Subtable;
}
if(isset($ExtensionLookupType)) {
$LookupType = $ExtensionLookupType;
}
$LookupList[] = array('LookupType' => $LookupType, 'LookupFlag' => $LookupFlag, 'MarkFilteringSet' => $MarkFilteringSet, 'SubTables' => $SubTables);
}
return array('Version' => $version, 'ScriptList' => $ScriptList, 'FeatureList' => $FeatureList, 'LookupList' => $LookupList);
}
function read_OTLookupTable($tag, $type, $offset) {
fseek($this->fh, $offset);
switch($tag) {
case 'GSUB':
$SubstFormat = $this->read_uint16();
switch($type) {
case 1: # Single
$CoverageOffset = $this->read_Offset();
if($SubstFormat == 1) {
$DeltaGlyphID = $this->read_uint16();
} else {
$GlyphCount = $this->read_uint16();
$Substitute = $this->read_GlyphID($GlyphCount);
}
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$Subst = array();
if($SubstFormat == 1) {
foreach($Coverage as $cv) {
$Subst[$cv] = $cv+$DeltaGlyphID;
}
} else {
for($i = 0; $i < $GlyphCount; $i++) {
$Subst[$Coverage[$i]] = $Substitute[$i];
}
}
return $Subst;
case 2: # Multiple
$CoverageOffset = $this->read_Offset();
$SequenceCount = $this->read_uint16();
$SequenceOffsets = $this->read_Offset($SequenceCount);
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$Sequences = array();
foreach($SequenceOffsets as $SequenceOffset) {
fseek($this->fh, $offset+$SequenceOffset);
$GlyphCount = $this->read_uint16();
$Sequences[] = $this->read_GlyphID($GlyphCount);
}
$Subst = array();
for($i = 0; $i < $SequenceCount; $i++) {
$Subst[$Coverage[$i]] = $Sequences[$i];
}
return $Subst;
case 3: # Alternate
$CoverageOffset = $this->read_Offset();
$AlternateSetCount = $this->read_uint16();
$AlternateSetOffsets = $this->read_Offset($AlternateSetCount);
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$AlternateSets = array();
for($i = 0; $i < $AlternateSetCount; $i++) {
fseek($this->fh, $offset+$AlternateSetOffsets[$i]);
$GlyphCount = $this->read_uint16();
$AlternateSets[$Coverage[$i]] = $this->read_GlyphID($GlyphCount);
}
return $AlternateSets;
case 4: # Ligature
$CoverageOffset = $this->read_Offset();
$LigSetCount = $this->read_uint16();
$LigSetOffsets = $this->read_Offset($LigSetCount);
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$LigatureSets = array();
for($i = 0; $i < $LigSetCount; $i++) {
fseek($this->fh, $offset+$LigSetOffsets[$i]);
$LigatureCount = $this->read_uint16();
$LigatureOffsets = $this->read_Offset($LigatureCount);
$LigSets = array();
foreach($LigatureOffsets as $LigatureOffset) {
fseek($this->fh, $offset+$LigSetOffsets[$i]+$LigatureOffset);
$LigGlyph = $this->read_GlyphID();
$CompCount = $this->read_uint16();
$Components = $this->read_GlyphID($CompCount-1);
$LigSets[] = array('LigGlyph' => $LigGlyph,'Components' => $Components);
}
$LigatureSets[$Coverage[$i]] = $LigSets;
}
return $LigatureSets;
case 5: # Context
break;
case 6: # Chaining Context
if($SubstFormat == 1) {
$CoverageOffset = $this->read_Offset();
$ChainSubRuleSetCount = $this->read_uint16();
$ChainSubRuleSetOffsets = $this->read_Offset($ChainSubRuleSetCount);
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$ChainSubRuleSets = array();
foreach($ChainSubRuleSetOffsets as $ChainSubRuleSetOffset) {
fseek($this->fh, $offset+$ChainSubRuleSetOffset);
$ChainSubRuleCount = $this->read_uint16();
$ChainSubRuleOffsets = $this->read_Offset($ChainSubRuleCount);
$ChainSubRules = array();
foreach($ChainSubRuleOffsets as $ChainSubRuleOffset) {
fseek($this->fh, $offset+$ChainSubRuleSetOffset+$ChainSubRuleOffset);
$BacktrackGlyphCount = $this->read_uint16();
$Backtrack = $this->read_GlyphID($BacktrackGlyphCount);
$InputGlyphCount = $this->read_uint16();
$Input = $this->read_GlyphID($InputGlyphCount-1);
$LookaheadGlyphCount = $this->read_uint16();
$LookAhead = $this->read_GlyphID($LookaheadGlyphCount);
$SubstCount = $this->read_uint16();
$SubstLookupRecords = array();
for($i = 0; $i < $SubstCount; $i++) {
$SubstLookupRecords = array('SequenceIndex' => $this->read_uint16(), 'LookupListIndex' => $this->read_uint16());
}
$ChainSubRules[] = array('Backtrack' => $Backtrack, 'Input' => $Input, 'LookAhead' => $LookAhead, 'SubstLookupRecords' => $SubstLookupRecords);
}
$ChainSubRuleSets[] = $ChainSubRules;
}
return array('SubstFormat' => $SubstFormat, 'Coverage' => $Coverage, 'ChainSubRuleSets' => $ChainSubRuleSets);
} elseif($SubstFormat == 2) {
$CoverageOffset = $this->read_Offset();
$BacktrackClassDefOffset = $this->read_Offset();
$InputClassDefOffset = $this->read_Offset();
$LookaheadClassDefOffset = $this->read_Offset();
$ChainSubClassSetCnt = $this->read_uint16();
$ChainSubClassSetOffsets = $this->read_Offset($ChainSubClassSetCnt);
$Coverage = $this->read_Coverage($offset+$CoverageOffset);
$BacktrackClassDef = $BacktrackClassDefOffset ? $this->read_Classes($offset+$BacktrackClassDefOffset) : array();
$InputClassDef = $this->read_Classes($offset+$InputClassDefOffset);
$LookaheadClassDef = $LookaheadClassDefOffset ? $this->read_Classes($offset+$LookaheadClassDefOffset) : array();
$ChainSubClassSet = array();
$c = 0;
foreach($ChainSubClassSetOffsets as $ChainSubClassSetOffset) {
if($ChainSubClassSetOffset > 0) {
fseek($this->fh, $offset+$ChainSubClassSetOffset);
$ChainSubClassRuleCnt = $this->read_uint16();
$ChainSubClassRuleOffsets = $this->read_Offset($ChainSubClassRuleCnt);
$ChainSubClassRules = array();
foreach($ChainSubClassRuleOffsets as $ChainSubClassRuleOffset) {
fseek($this->fh, $offset+$ChainSubClassSetOffset+$ChainSubClassRuleOffset);
$BacktrackGlyphCount = $this->read_uint16();
$Backtrack = $this->read_GlyphID($BacktrackGlyphCount);
$InputGlyphCount = $this->read_uint16();
$Input = $this->read_GlyphID($InputGlyphCount-1);
$LookaheadGlyphCount = $this->read_uint16();
$LookAhead = $this->read_GlyphID($LookaheadGlyphCount);
$SubstCount = $this->read_uint16();
$SubstLookupRecords = array();
for($i = 0; $i < $SubstCount; $i++) {
$SubstLookupRecords = array('SequenceIndex' => $this->read_uint16(), 'LookupListIndex' => $this->read_uint16());
}
$ChainSubClassRules[] = array('Backtrack' => $Backtrack, 'Input' => $Input, 'LookAhead' => $LookAhead, 'SubstLookupRecords' => $SubstLookupRecords);
}
$ChainSubClassSet[$c] = $ChainSubClassRules;
}
$c++;
}
return array('SubstFormat' => $SubstFormat, 'Coverage' => $Coverage, 'BacktrackClassDef' => $BacktrackClassDef, 'InputClassDef' => $InputClassDef, 'LookaheadClassDef' => $LookaheadClassDef, 'ChainSubClassSet' => $ChainSubClassSet);
} elseif($SubstFormat == 3) {
$BacktrackGlyphCount = $this->read_uint16();
$BacktrackCoverageOffsets = $this->read_Offset($BacktrackGlyphCount);
$InputGlyphCount = $this->read_uint16();
$InputCoverageOffsets = $this->read_Offset($InputGlyphCount);
$LookaheadGlyphCount = $this->read_uint16();
$LookAheadCoverageOffsets = $this->read_Offset($LookaheadGlyphCount);
$SubstCount = $this->read_uint16();
$SubstLookupRecords = array();
for($i = 0; $i < $SubstCount; $i++) {
$SubstLookupRecords[] = array('SequenceIndex' => $this->read_uint16(), 'LookupListIndex' => $this->read_uint16());
}
$Backtrack = array();
foreach($BacktrackCoverageOffsets as $BacktrackCoverageOffset) {
$Backtrack[] = $this->read_Coverage($offset+$BacktrackCoverageOffset);
}
$Input = array();
foreach($InputCoverageOffsets as $InputCoverageOffset) {
$Input[] = $this->read_Coverage($offset+$InputCoverageOffset);
}
$LookAhead = array();
foreach($LookAheadCoverageOffsets as $LookAheadCoverageOffset) {
$LookAhead[] = $this->read_Coverage($offset+$LookAheadCoverageOffset);
}
return array('SubstFormat' => $SubstFormat, 'Backtrack' => $Backtrack, 'Input' => $Input, 'LookAhead' => $LookAhead, 'SubstLookupRecords' => $SubstLookupRecords);
}
break;
case 7: # Extension Substitution
$ExtensionLookupType = $this->read_USHORT();
$ExtensionOffset = $this->read_ULONG();
$Extension = $this->read_OTLookupTable($tag, $ExtensionLookupType, $offset+$ExtensionOffset);
$Extension['ExtensionLookupType'] = $ExtensionLookupType;
return $Extension;
case 8: # Reverse chaining context single
break;
}
return array('SubstFormat' => $SubstFormat);
case 'GPOS':
$PosFormat = $this->read_uint16();
switch($type) {
case 1: # Single adjustment
break;
case 2: # Pair adjustment
break;
case 3: # Cursive attachment
break;
case 4: # MarkToBase attachment
$MarkCoverageOffset = $this->read_Offset();
$BaseCoverageOffset = $this->read_Offset();
$ClassCount = $this->read_uint16();
$MarkArrayOffset = $this->read_Offset();
$BaseArrayOffset = $this->read_Offset();
$MarkCoverage = $this->read_Coverage($offset+$MarkCoverageOffset);
$BaseCoverage = $this->read_Coverage($offset+$BaseCoverageOffset);
//$MarkArray = $this->read_MarkArray($offset+$MarkArrayOffset);
$BaseArray = array();
fseek($this->fh, $offset+$BaseArrayOffset);
$BaseCount = $this->read_uint16();
$BaseRecordOffsets = array();
for($i = 0; $i < $BaseCount; $i++) {
$BaseRecordOffsets[] = $this->read_Offset($ClassCount);
}
break;
case 5: # MarkToLigature attachment
break;
case 6: # MarkToMark attachment
break;
case 7: # Context positioning
break;
case 8: # Chained Context positioning
break;
case 9: # Extension positioning
$ExtensionLookupType = $this->read_USHORT();
$ExtensionOffset = $this->read_ULONG();
$Extension = $this->read_OTLookupTable($tag, $ExtensionLookupType, $offset+$ExtensionOffset);
$Extension['LookupType'] = $ExtensionLookupType;
return $Extension;
}
return array('PosFormat' => $PosFormat);
}
return 'TODO';
}
function read_Coverage($offset) {
fseek($this->fh, $offset);
$CoverageFormat = $this->read_uint16();
$Coverage = array();
switch($CoverageFormat) {
case 1:
$GlyphCount = $this->read_uint16();
for($i = 0; $i < $GlyphCount; $i++) {
$Coverage[] = $this->read_GlyphID();
}
break;
case 2:
$RangeCount = $this->read_uint16();
for($i = 0; $i < $RangeCount; $i++) {
$Start = $this->read_GlyphID();
$End = $this->read_GlyphID();
$StartCoverageIndex = $this->read_uint16();
for($j = $Start; $j <= $End; $j++) {
$Coverage[] = $j;
}
}
break;
}
return $Coverage;
}
function read_Classes($offset) {
fseek($this->fh, $offset);
$ClassFormat = $this->read_uint16();
$Classes = array();
switch($ClassFormat) {
case 1:
$StartGlyph = $this->read_GlyphID();
$GlyphCount = $this->read_uint16();
$Coverage = array();
for($i = 0; $i < $GlyphCount; $i++) {
$Classes[$StartGlyph+$i] = $this->read_GlyphID();
}
break;
case 2:
$RangeCount = $this->read_uint16();
for($i = 0; $i < $RangeCount; $i++) {