nguyenhanhdk / 3DHOUSINGCAD

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dompdf/lib/php-font-lib/src/FontLib/Table/DirectoryEntry.php 2.69 KB
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670b6d6f8   tuan   2016/09/22 - Copy... 
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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("
  ==== $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()
      {
          //
      }
  }