DirectoryEntry.php
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<?php
/**
* @package php-font-lib
* @link https://github.com/PhenX/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 $origF;
static function computeChecksum($data)
{
$len = strlen($data);
$mod = $len % 4;
if ($mod) {
$data = str_pad($data, $len + (4 - $mod), "\0");
}
$len = strlen($data);
$hi = 0x0000;
$lo = 0x0000;
for ($i = 0; $i < $len; $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 = $hi & 0xFFFF;
}
return ($hi << 8) + $lo;
}
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_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);
}
/**
* @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()
{
//
}
}