Verzeichnisstruktur phpBB-3.2.0
- Veröffentlicht
- 06.01.2017
So funktioniert es
|
|
Auf das letzte Element klicken. Dies geht jeweils ein Schritt zurück |
Auf das Icon klicken, dies öffnet das Verzeichnis. Nochmal klicken schließt das Verzeichnis. |
|
|
(Beispiel Datei-Icons)
|
Auf das Icon klicken um den Quellcode anzuzeigen |
TypeTif.php
001 <?php
002
003 /**
004 * fast-image-size image type tif
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 class TypeTif extends TypeBase
015 {
016 /** @var int TIF header size. The header might be larger but the dimensions
017 * should be in the first 512 bytes */
018 const TIF_HEADER_SIZE = 512;
019
020 /** @var int TIF tag for image height */
021 const TIF_TAG_IMAGE_HEIGHT = 257;
022
023 /** @var int TIF tag for image width */
024 const TIF_TAG_IMAGE_WIDTH = 256;
025
026 /** @var int TIF tag type for short */
027 const TIF_TAG_TYPE_SHORT = 3;
028
029 /** @var int TIF IFD entry size */
030 const TIF_IFD_ENTRY_SIZE = 12;
031
032 /** @var string TIF signature of intel type */
033 const TIF_SIGNATURE_INTEL = 'II';
034
035 /** @var string TIF signature of motorola type */
036 const TIF_SIGNATURE_MOTOROLA = 'MM';
037
038 /** @var array Size info array */
039 protected $size;
040
041 /** @var string Bit type of long field */
042 protected $typeLong;
043
044 /** @var string Bit type of short field */
045 protected $typeShort;
046
047 /**
048 * {@inheritdoc}
049 */
050 public function getSize($filename)
051 {
052 // Do not force length of header
053 $data = $this->fastImageSize->getImage($filename, 0, self::TIF_HEADER_SIZE, false);
054
055 $this->size = array();
056
057 $signature = substr($data, 0, self::SHORT_SIZE);
058
059 if (!in_array($signature, array(self::TIF_SIGNATURE_INTEL, self::TIF_SIGNATURE_MOTOROLA)))
060 {
061 return;
062 }
063
064 // Set byte type
065 $this->setByteType($signature);
066
067 // Get offset of IFD
068 list(, $offset) = unpack($this->typeLong, substr($data, self::LONG_SIZE, self::LONG_SIZE));
069
070 // Get size of IFD
071 list(, $sizeIfd) = unpack($this->typeShort, substr($data, $offset, self::SHORT_SIZE));
072
073 // Skip 2 bytes that define the IFD size
074 $offset += self::SHORT_SIZE;
075
076 // Filter through IFD
077 for ($i = 0; $i < $sizeIfd; $i++)
078 {
079 // Get IFD tag
080 $type = unpack($this->typeShort, substr($data, $offset, self::SHORT_SIZE));
081
082 // Get field type of tag
083 $fieldType = unpack($this->typeShort . 'type', substr($data, $offset + self::SHORT_SIZE, self::SHORT_SIZE));
084
085 // Get IFD entry
086 $ifdValue = substr($data, $offset + 2 * self::LONG_SIZE, self::LONG_SIZE);
087
088 // Set size of field
089 $this->setSizeInfo($type[1], $fieldType['type'], $ifdValue);
090
091 $offset += self::TIF_IFD_ENTRY_SIZE;
092 }
093
094 $this->fastImageSize->setSize($this->size);
095 }
096
097 /**
098 * Set byte type based on signature in header
099 *
100 * @param string $signature Header signature
101 */
102 protected function setByteType($signature)
103 {
104 if ($signature === self::TIF_SIGNATURE_INTEL)
105 {
106 $this->typeLong = 'V';
107 $this->typeShort = 'v';
108 $this->size['type'] = IMAGETYPE_TIFF_II;
109 }
110 else
111 {
112 $this->typeLong = 'N';
113 $this->typeShort = 'n';
114 $this->size['type'] = IMAGETYPE_TIFF_MM;
115 }
116 }
117
118 /**
119 * Set size info
120 *
121 * @param int $dimensionType Type of dimension. Either width or height
122 * @param int $fieldLength Length of field. Either short or long
123 * @param string $ifdValue String value of IFD field
124 */
125 protected function setSizeInfo($dimensionType, $fieldLength, $ifdValue)
126 {
127 // Set size of field
128 $fieldSize = $fieldLength === self::TIF_TAG_TYPE_SHORT ? $this->typeShort : $this->typeLong;
129
130 // Get actual dimensions from IFD
131 if ($dimensionType === self::TIF_TAG_IMAGE_HEIGHT)
132 {
133 $this->size = array_merge($this->size, unpack($fieldSize . 'height', $ifdValue));
134 }
135 else if ($dimensionType === self::TIF_TAG_IMAGE_WIDTH)
136 {
137 $this->size = array_merge($this->size, unpack($fieldSize . 'width', $ifdValue));
138 }
139 }
140 }
141