Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
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TypePsd.php
01 <?php
02
03 /**
04 * fast-image-size image type psd
05 * @package fast-image-size
06 * @copyright (c) Marc Alexander <admin@m-a-styles.de>
07 *
08 * For the full copyright and license information, please view the LICENSE
09 * file that was distributed with this source code.
10 */
11
12 namespace FastImageSize\Type;
13
14 class TypePsd extends TypeBase
15 {
16 /** @var string PSD signature */
17 const PSD_SIGNATURE = "8BPS";
18
19 /** @var int PSD header size */
20 const PSD_HEADER_SIZE = 22;
21
22 /** @var int PSD dimensions info offset */
23 const PSD_DIMENSIONS_OFFSET = 14;
24
25 /**
26 * {@inheritdoc}
27 */
28 public function getSize($filename)
29 {
30 $data = $this->fastImageSize->getImage($filename, 0, self::PSD_HEADER_SIZE);
31
32 if ($data === false)
33 {
34 return;
35 }
36
37 // Offset for version info is length of header but version is only a
38 // 16-bit unsigned value
39 $version = unpack('n', substr($data, self::LONG_SIZE, 2));
40
41 // Check if supplied file is a PSD file
42 if (!$this->validPsd($data, $version))
43 {
44 return;
45 }
46
47 $size = unpack('Nheight/Nwidth', substr($data, self::PSD_DIMENSIONS_OFFSET, 2 * self::LONG_SIZE));
48
49 $this->fastImageSize->setSize($size);
50 $this->fastImageSize->setImageType(IMAGETYPE_PSD);
51 }
52
53 /**
54 * Return whether file is a valid PSD file
55 *
56 * @param string $data Image data string
57 * @param array $version Version array
58 *
59 * @return bool True if image is a valid PSD file, false if not
60 */
61 protected function validPsd($data, $version)
62 {
63 return substr($data, 0, self::LONG_SIZE) === self::PSD_SIGNATURE && $version[1] === 1;
64 }
65 }
66