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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 */
/** * Generic Font table directory entry. * * @package php-font-lib */ class Font_Table_Directory_Entry extends Font_Binary_Stream { /** * @var Font_TrueType */ protected $font; /** * @var Font_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(Font_TrueType $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(Font_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 Font_TrueType */ 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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