DirectoryEntry.php
119 lines
| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * @package php-font-lib |
| 5 | * @link https://github.com/PhenX/php-font-lib |
| 6 | * @author Fabien Ménager <fabien.menager@gmail.com> |
| 7 | * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License |
| 8 | */ |
| 9 | namespace IAWP\FontLib\Table; |
| 10 | |
| 11 | use IAWP\FontLib\TrueType\File; |
| 12 | use IAWP\FontLib\Font; |
| 13 | use IAWP\FontLib\BinaryStream; |
| 14 | /** |
| 15 | * Generic Font table directory entry. |
| 16 | * |
| 17 | * @package php-font-lib |
| 18 | */ |
| 19 | class DirectoryEntry extends BinaryStream |
| 20 | { |
| 21 | /** |
| 22 | * @var File |
| 23 | */ |
| 24 | protected $font; |
| 25 | /** |
| 26 | * @var Table |
| 27 | */ |
| 28 | protected $font_table; |
| 29 | public $entryLength = 4; |
| 30 | public $tag; |
| 31 | public $checksum; |
| 32 | public $offset; |
| 33 | public $length; |
| 34 | protected $origF; |
| 35 | /** |
| 36 | * @param string $data |
| 37 | * |
| 38 | * @return int |
| 39 | */ |
| 40 | static function computeChecksum($data) |
| 41 | { |
| 42 | $len = \mb_strlen($data, '8bit'); |
| 43 | $mod = $len % 4; |
| 44 | if ($mod) { |
| 45 | $data = \str_pad($data, $len + (4 - $mod), "\x00"); |
| 46 | } |
| 47 | $len = \mb_strlen($data, '8bit'); |
| 48 | $hi = 0x0; |
| 49 | $lo = 0x0; |
| 50 | for ($i = 0; $i < $len; $i += 4) { |
| 51 | $hi += (\ord($data[$i]) << 8) + \ord($data[$i + 1]); |
| 52 | $lo += (\ord($data[$i + 2]) << 8) + \ord($data[$i + 3]); |
| 53 | $hi += $lo >> 16; |
| 54 | $lo = $lo & 0xffff; |
| 55 | $hi = $hi & 0xffff; |
| 56 | } |
| 57 | return ($hi << 8) + $lo; |
| 58 | } |
| 59 | function __construct(File $font) |
| 60 | { |
| 61 | $this->font = $font; |
| 62 | $this->f = $font->f; |
| 63 | } |
| 64 | function parse() |
| 65 | { |
| 66 | $this->tag = $this->font->read(4); |
| 67 | } |
| 68 | function open($filename, $mode = self::modeRead) |
| 69 | { |
| 70 | // void |
| 71 | } |
| 72 | function setTable(Table $font_table) |
| 73 | { |
| 74 | $this->font_table = $font_table; |
| 75 | } |
| 76 | function encode($entry_offset) |
| 77 | { |
| 78 | Font::d("\n==== {$this->tag} ===="); |
| 79 | //Font::d("Entry offset = $entry_offset"); |
| 80 | $data = $this->font_table; |
| 81 | $font = $this->font; |
| 82 | $table_offset = $font->pos(); |
| 83 | $this->offset = $table_offset; |
| 84 | $table_length = $data->encode(); |
| 85 | $font->seek($table_offset); |
| 86 | $table_data = $font->read($table_length); |
| 87 | $font->seek($entry_offset); |
| 88 | $font->write($this->tag, 4); |
| 89 | $font->writeUInt32(self::computeChecksum($table_data)); |
| 90 | $font->writeUInt32($table_offset); |
| 91 | $font->writeUInt32($table_length); |
| 92 | Font::d("Bytes written = {$table_length}"); |
| 93 | $font->seek($table_offset + $table_length); |
| 94 | } |
| 95 | /** |
| 96 | * @return File |
| 97 | */ |
| 98 | function getFont() |
| 99 | { |
| 100 | return $this->font; |
| 101 | } |
| 102 | function startRead() |
| 103 | { |
| 104 | $this->font->seek($this->offset); |
| 105 | } |
| 106 | function endRead() |
| 107 | { |
| 108 | // |
| 109 | } |
| 110 | function startWrite() |
| 111 | { |
| 112 | $this->font->seek($this->offset); |
| 113 | } |
| 114 | function endWrite() |
| 115 | { |
| 116 | // |
| 117 | } |
| 118 | } |
| 119 |