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