| 1 | <?php |
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| 2 | /* |
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| 3 | * --:: JPEG MetaDatas ::------------------------------------------------------- |
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| 4 | * |
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| 5 | * Author : Grum |
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| 6 | * email : grum at piwigo.org |
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| 7 | * website : http://photos.grum.fr |
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| 8 | * |
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| 9 | * << May the Little SpaceFrog be with you ! >> |
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| 10 | * |
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| 11 | * ----------------------------------------------------------------------------- |
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| 12 | * |
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| 13 | * |
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| 14 | * ----------------------------------------------------------------------------- |
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| 15 | * |
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| 16 | * ----------------------------------------------------------------------------- |
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| 17 | */ |
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| 18 | |
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| 19 | require_once(JPEG_METADATA_DIR."Common/ConvertData.class.php"); |
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| 20 | require_once(JPEG_METADATA_DIR."Common/Data.class.php"); |
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| 21 | require_once(JPEG_METADATA_DIR."Readers/SegmentReader.class.php"); |
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| 22 | require_once(JPEG_METADATA_DIR."Readers/IfdReader.class.php"); |
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| 23 | |
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| 24 | class TiffReader extends SegmentReader |
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| 25 | { |
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| 26 | private $IFDs = Array(); |
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| 27 | private $offsetData = 0; |
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| 28 | private $byteOrder = BYTE_ORDER_LITTLE_ENDIAN; |
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| 29 | private $firstIFDOffset = 0; |
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| 30 | |
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| 31 | function __construct(Data $data, $offsetData=0) |
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| 32 | { |
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| 33 | parent::__construct($data); |
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| 34 | |
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| 35 | $this->offsetData = $offsetData; |
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| 36 | $header=$this->data->readASCII(2); |
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| 37 | |
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| 38 | /* |
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| 39 | * TIFF Header begins wih "II" or "MM" (indicate the byte order) |
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| 40 | * next value is an USHORT, must equals 0x2a |
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| 41 | * |
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| 42 | * all data have to be read with the byte order defined in header |
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| 43 | */ |
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| 44 | if($header=="II" or $header="MM") |
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| 45 | { |
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| 46 | $this->byteOrder=$header; |
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| 47 | $this->data->setByteOrder($this->byteOrder); |
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| 48 | |
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| 49 | $header=$this->data->readUShort(); |
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| 50 | if($header==0x2a) |
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| 51 | { |
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| 52 | $this->isValid=true; |
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| 53 | $this->firstIFDOffset=$this->data->readULong(); |
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| 54 | $this->readData(); |
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| 55 | } |
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| 56 | } |
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| 57 | } |
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| 58 | |
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| 59 | function __destruct() |
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| 60 | { |
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| 61 | unset($this->IFDs); |
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| 62 | } |
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| 63 | |
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| 64 | private function readData() |
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| 65 | { |
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| 66 | $nextIFD = $this->firstIFDOffset; |
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| 67 | while($nextIFD!=0) |
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| 68 | { |
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| 69 | $this->data->seek($nextIFD); |
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| 70 | $IFD = new IfdReader($this->data->readASCII(), $nextIFD, $this->byteOrder); |
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| 71 | $this->IFDs[]=$IFD; |
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| 72 | $nextIFD = $IFD->getNextIFDOffset(); |
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| 73 | } |
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| 74 | } |
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| 75 | |
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| 76 | public function getNbIFDs() |
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| 77 | { |
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| 78 | return(count($this->IFDs)); |
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| 79 | } |
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| 80 | |
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| 81 | public function getIFDs() |
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| 82 | { |
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| 83 | return($this->IFDs); |
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| 84 | } |
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| 85 | |
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| 86 | public function getIFD($num) |
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| 87 | { |
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| 88 | if($num>=0 and $num<count($this->IFDs)) |
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| 89 | return($this->IFDs[$num]); |
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| 90 | else |
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| 91 | return(null); |
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| 92 | } |
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| 93 | |
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| 94 | |
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| 95 | public function toString() |
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| 96 | { |
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| 97 | $returned="TIFF block offset: ".sprintf("%08x", $this->offsetData). |
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| 98 | " ; byteOrder: ".$this->byteOrder. |
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| 99 | " ; isValid: ".($this->isValid?"Y":"N"). |
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| 100 | " ; isLoaded: ".($this->isValid?"Y":"N"). |
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| 101 | " ; IFDs: ".count($this->IFDs). |
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| 102 | " ; first IFD Offset: ".sprintf("0x%04x", $this->firstIFDOffset); |
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| 103 | return($returned); |
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| 104 | } |
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| 105 | |
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| 106 | } |
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| 107 | |
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| 108 | |
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| 109 | ?> |
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