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<?php
/**
* @package php-font-lib
* @link https://github.com/dompdf/php-font-lib
* @author Fabien Ménager <fabien.menager@gmail.com>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
*/
namespace FontLib\Table;
use FontLib\TrueType\File;
use FontLib\Font;
use FontLib\BinaryStream;
/**
* Generic Font table directory entry.
*
* @package php-font-lib
*/
class DirectoryEntry extends BinaryStream {
/**
* @var File
*/
protected $font;
/**
* @var Table
*/
protected $font_table;
public $entryLength = 4;
public $tag;
public $checksum;
public $offset;
public $length;
protected $origF;
/**
* @param string $data
*
* @return int
*/
static function computeChecksum($data) {
$len = mb_strlen($data, '8bit');
$mod = $len % 4;
if ($mod) {
$data = str_pad($data, $len + (4 - $mod), "\0");
}
$table = unpack("N*", $data);
return array_sum($table);
}
function __construct(File $font) {
$this->font = $font;
$this->f = $font->f;
}
function parse() {
$this->tag = $this->font->read(4);
}
function open($filename, $mode = self::modeRead) {
// void
}
function setTable(Table $font_table) {
$this->font_table = $font_table;
}
function encode($entry_offset) {
Font::d("\n==== $this->tag ====");
//Font::d("Entry offset = $entry_offset");
$data = $this->font_table;
$font = $this->font;
$table_offset = $font->pos();
$this->offset = $table_offset;
$table_length = $data->encode();
$font->seek($table_offset + $table_length);
$pad = 0;
$mod = $table_length % 4;
if ($mod != 0) {
$pad = 4 - $mod;
$font->write(str_pad("", $pad, "\0"), $pad);
}
$font->seek($table_offset);
$table_data = $font->read($table_length);
$font->seek($entry_offset);
$font->write($this->tag, 4);
$font->writeUInt32(self::computeChecksum($table_data));
$font->writeUInt32($table_offset);
$font->writeUInt32($table_length);
Font::d("Bytes written = $table_length");
$font->seek($table_offset + $table_length + $pad);
}
/**
* @return File
*/
function getFont() {
return $this->font;
}
function startRead() {
$this->font->seek($this->offset);
}
function endRead() {
//
}
function startWrite() {
$this->font->seek($this->offset);
}
function endWrite() {
//
}
}
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