source-class-Com.Tecnick.Pdf.Image.Import.Jpeg

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 1: <?php
 2: /**
 3:  * Jpeg.php
 4:  *
 5:  * @since       2011-05-23
 6:  * @category    Library
 7:  * @package     PdfImage
 8:  * @author      Nicola Asuni <info@tecnick.com>
 9:  * @copyright   2011-2015 Nicola Asuni - Tecnick.com LTD
10:  * @license     http://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE.TXT)
11:  * @link        https://github.com/tecnickcom/tc-lib-pdf-image
12:  *
13:  * This file is part of tc-lib-pdf-image software library.
14:  */
15: 
16: namespace Com\Tecnick\Pdf\Image\Import;
17: 
18: use \Com\Tecnick\File\File;
19: use \Com\Tecnick\File\Byte;
20: use \Com\Tecnick\Pdf\Image\Exception as ImageException;
21: 
22: /**
23:  * Com\Tecnick\Pdf\Image\Import\Jpeg
24:  *
25:  * @since       2011-05-23
26:  * @category    Library
27:  * @package     PdfImage
28:  * @author      Nicola Asuni <info@tecnick.com>
29:  * @copyright   2011-2016 Nicola Asuni - Tecnick.com LTD
30:  * @license     http://www.gnu.org/copyleft/lesser.html GNU-LGPL v3 (see LICENSE.TXT)
31:  * @link        https://github.com/tecnickcom/tc-lib-pdf-image
32:  */
33: class Jpeg
34: {
35:     /**
36:      * Extract data from a JPEG image
37:      *
38:      * @param string $data Image raw data
39:      *
40:      * @return array Image raw data array
41:      */
42:     public function getData($data)
43:     {
44:         $data['filter'] = 'DCTDecode';
45:         $data['data'] = $data['raw'];
46:         $byte = new Byte($data['raw']);
47:         // extract embedded ICC profile (if any)
48:         $icc = array();
49:         $offset = 0;
50:         while (($pos = strpos($data['raw'], 'ICC_PROFILE'."\0", $offset)) !== false) {
51:             // get ICC sequence length
52:             $length = ($byte->getUShort($pos - 2) - 16);
53:             // marker sequence number
54:             $msn = max(1, ord($data['raw'][($pos + 12)]));
55:             // number of markers (total of APP2 used)
56:             //$nom = max(1, ord($data['raw'][($pos + 13)]));
57:             // get sequence segment
58:             $icc[($msn - 1)] = substr($data['raw'], ($pos + 14), $length);
59:             // move forward to next sequence
60:             $offset = ($pos + 14 + $length);
61:         }
62:         // order and compact ICC segments
63:         if (count($icc) > 0) {
64:             ksort($icc);
65:             $icc = implode('', $icc);
66:             if (substr($icc, 36, 4) == 'acsp') {
67:                 // valid ICC profile
68:                 $data['icc'] = $icc;
69:             }
70:         }
71:         return $data;
72:     }
73: }
74: 
 

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