Verzeichnisstruktur phpBB-3.3.15
- Veröffentlicht
- 28.08.2024
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TypeWebp.php
001 <?php
002
003 /**
004 * fast-image-size image type webp
005 * @package fast-image-size
006 * @copyright (c) Marc Alexander <admin@m-a-styles.de>
007 *
008 * For the full copyright and license information, please view the LICENSE
009 * file that was distributed with this source code.
010 */
011
012 namespace FastImageSize\Type;
013
014 use \FastImageSize\FastImageSize;
015
016 class TypeWebp extends TypeBase
017 {
018 /** @var string RIFF header */
019 const WEBP_RIFF_HEADER = "RIFF";
020
021 /** @var string Webp header */
022 const WEBP_HEADER = "WEBP";
023
024 /** @var string VP8 chunk header */
025 const VP8_HEADER = "VP8";
026
027 /** @var string Simple(lossy) webp format */
028 const WEBP_FORMAT_SIMPLE = ' ';
029
030 /** @var string Lossless webp format */
031 const WEBP_FORMAT_LOSSLESS = 'L';
032
033 /** @var string Extended webp format */
034 const WEBP_FORMAT_EXTENDED = 'X';
035
036 /** @var int WEBP header size needed for retrieving image size */
037 const WEBP_HEADER_SIZE = 30;
038
039 /** @var array Size info array */
040 protected $size;
041
042 /**
043 * Constructor for webp image type. Adds missing constant if necessary.
044 *
045 * @param FastImageSize $fastImageSize
046 */
047 public function __construct(FastImageSize $fastImageSize)
048 {
049 parent::__construct($fastImageSize);
050
051 if (!defined('IMAGETYPE_WEBP'))
052 {
053 define('IMAGETYPE_WEBP', 18);
054 }
055 }
056
057 /**
058 * {@inheritdoc}
059 */
060 public function getSize($filename)
061 {
062 // Do not force length of header
063 $data = $this->fastImageSize->getImage($filename, 0, self::WEBP_HEADER_SIZE);
064
065 $this->size = array();
066
067 $webpFormat = substr($data, 15, 1);
068
069 if (!$this->hasWebpHeader($data) || !$this->isValidFormat($webpFormat))
070 {
071 return;
072 }
073
074 $data = substr($data, 16, 14);
075
076 $this->getWebpSize($data, $webpFormat);
077
078 $this->fastImageSize->setSize($this->size);
079 $this->fastImageSize->setImageType(IMAGETYPE_WEBP);
080 }
081
082 /**
083 * Check if $data has valid WebP header
084 *
085 * @param string $data Image data
086 *
087 * @return bool True if $data has valid WebP header, false if not
088 */
089 protected function hasWebpHeader($data)
090 {
091 $riffSignature = substr($data, 0, self::LONG_SIZE);
092 $webpSignature = substr($data, 8, self::LONG_SIZE);
093 $vp8Signature = substr($data, 12, self::SHORT_SIZE + 1);
094
095 return !empty($data) && $riffSignature === self::WEBP_RIFF_HEADER &&
096 $webpSignature === self::WEBP_HEADER && $vp8Signature === self::VP8_HEADER;
097 }
098
099 /**
100 * Check if $format is a valid WebP format
101 *
102 * @param string $format Format string
103 * @return bool True if format is valid WebP format, false if not
104 */
105 protected function isValidFormat($format)
106 {
107 return in_array($format, array(self::WEBP_FORMAT_SIMPLE, self::WEBP_FORMAT_LOSSLESS, self::WEBP_FORMAT_EXTENDED));
108 }
109
110 /**
111 * Get webp size info depending on format type and set size array values
112 *
113 * @param string $data Data string
114 * @param string $format Format string
115 */
116 protected function getWebpSize($data, $format)
117 {
118 switch ($format)
119 {
120 case self::WEBP_FORMAT_SIMPLE:
121 $this->size = unpack('vwidth/vheight', substr($data, 10, 4));
122 break;
123
124 case self::WEBP_FORMAT_LOSSLESS:
125 // Lossless uses 14-bit values so we'll have to use bitwise shifting
126 $this->size = array(
127 'width' => ord($data[5]) + ((ord($data[6]) & 0x3F) << 8) + 1,
128 'height' => (ord($data[6]) >> 6) + (ord($data[7]) << 2) + ((ord($data[8]) & 0xF) << 10) + 1,
129 );
130 break;
131
132 case self::WEBP_FORMAT_EXTENDED:
133 // Extended uses 24-bit values cause 14-bit for lossless wasn't weird enough
134 $this->size = array(
135 'width' => ord($data[8]) + (ord($data[9]) << 8) + (ord($data[10]) << 16) + 1,
136 'height' => ord($data[11]) + (ord($data[12]) << 8) + (ord($data[13]) << 16) + 1,
137 );
138 break;
139 }
140 }
141 }
142