xref: /dokuwiki/inc/JpegMeta.php (revision 85c59bdbad852d23519e5f77c0e2d7f7ec60121f) 
1<?php
2/**
3 * JPEG metadata reader/writer
4 *
5 * @license    BSD <http://www.opensource.org/licenses/bsd-license.php>
6 * @link       http://github.com/sd/jpeg-php
7 * @author     Sebastian Delmont <sdelmont@zonageek.com>
8 * @author     Andreas Gohr <andi@splitbrain.org>
9 * @author     Hakan Sandell <hakan.sandell@mydata.se>
10 * @todo       Add support for Maker Notes, Extend for GIF and PNG metadata
11 */
12
13// Original copyright notice:
14//
15// Copyright (c) 2003 Sebastian Delmont <sdelmont@zonageek.com>
16// All rights reserved.
17//
18// Redistribution and use in source and binary forms, with or without
19// modification, are permitted provided that the following conditions
20// are met:
21// 1. Redistributions of source code must retain the above copyright
22//    notice, this list of conditions and the following disclaimer.
23// 2. Redistributions in binary form must reproduce the above copyright
24//    notice, this list of conditions and the following disclaimer in the
25//    documentation and/or other materials provided with the distribution.
26// 3. Neither the name of the author nor the names of its contributors
27//    may be used to endorse or promote products derived from this software
28//    without specific prior written permission.
29//
30// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
31// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
32// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
33// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
34// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
35// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
36// TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
37// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
38// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
39// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
40// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
41
42class JpegMeta {
43    var $_fileName;
44    var $_fp = null;
45    var $_fpout = null;
46    var $_type = 'unknown';
47
48    var $_markers;
49    var $_info;
50
51
52    /**
53     * Constructor
54     *
55     * @author Sebastian Delmont <sdelmont@zonageek.com>
56     */
57    function JpegMeta($fileName) {
58
59        $this->_fileName = $fileName;
60
61        $this->_fp = null;
62        $this->_type = 'unknown';
63
64        unset($this->_info);
65        unset($this->_markers);
66    }
67
68    /**
69     * Returns all gathered info as multidim array
70     *
71     * @author Sebastian Delmont <sdelmont@zonageek.com>
72     */
73    function & getRawInfo() {
74        $this->_parseAll();
75
76        if ($this->_markers == null) {
77            return false;
78        }
79
80        return $this->_info;
81    }
82
83    /**
84     * Returns basic image info
85     *
86     * @author Sebastian Delmont <sdelmont@zonageek.com>
87     */
88    function & getBasicInfo() {
89        $this->_parseAll();
90
91        $info = array();
92
93        if ($this->_markers == null) {
94            return false;
95        }
96
97        $info['Name'] = $this->_info['file']['Name'];
98        if (isset($this->_info['file']['Url'])) {
99            $info['Url'] = $this->_info['file']['Url'];
100            $info['NiceSize'] = "???KB";
101        } else {
102            $info['Size'] = $this->_info['file']['Size'];
103            $info['NiceSize'] = $this->_info['file']['NiceSize'];
104        }
105
106        if (@isset($this->_info['sof']['Format'])) {
107            $info['Format'] = $this->_info['sof']['Format'] . " JPEG";
108        } else {
109            $info['Format'] = $this->_info['sof']['Format'] . " JPEG";
110        }
111
112        if (@isset($this->_info['sof']['ColorChannels'])) {
113            $info['ColorMode'] = ($this->_info['sof']['ColorChannels'] > 1) ? "Color" : "B&W";
114        }
115
116        $info['Width'] = $this->getWidth();
117        $info['Height'] = $this->getHeight();
118        $info['DimStr'] = $this->getDimStr();
119
120        $dates = $this->getDates();
121
122        $info['DateTime'] = $dates['EarliestTime'];
123        $info['DateTimeStr'] = $dates['EarliestTimeStr'];
124
125        $info['HasThumbnail'] = $this->hasThumbnail();
126
127        return $info;
128    }
129
130
131    /**
132     * Convinience function to access nearly all available Data
133     * through one function
134     *
135     * @author Andreas Gohr <andi@splitbrain.org>
136     *
137     * @param array|string $fields field name or array with field names
138     * @return bool|string
139     */
140    function getField($fields) {
141        if(!is_array($fields)) $fields = array($fields);
142        $info = false;
143        foreach($fields as $field){
144            if(strtolower(substr($field,0,5)) == 'iptc.'){
145                $info = $this->getIPTCField(substr($field,5));
146            }elseif(strtolower(substr($field,0,5)) == 'exif.'){
147                $info = $this->getExifField(substr($field,5));
148            }elseif(strtolower(substr($field,0,4)) == 'xmp.'){
149                $info = $this->getXmpField(substr($field,4));
150            }elseif(strtolower(substr($field,0,5)) == 'file.'){
151                $info = $this->getFileField(substr($field,5));
152            }elseif(strtolower(substr($field,0,5)) == 'date.'){
153                $info = $this->getDateField(substr($field,5));
154            }elseif(strtolower($field) == 'simple.camera'){
155                $info = $this->getCamera();
156            }elseif(strtolower($field) == 'simple.raw'){
157                return $this->getRawInfo();
158            }elseif(strtolower($field) == 'simple.title'){
159                $info = $this->getTitle();
160            }elseif(strtolower($field) == 'simple.shutterspeed'){
161                $info = $this->getShutterSpeed();
162            }else{
163                $info = $this->getExifField($field);
164            }
165            if($info != false) break;
166        }
167
168        if($info === false)  $info = '';
169        if(is_array($info)){
170            if(isset($info['val'])){
171                $info = $info['val'];
172            }else{
173                $info = join(', ',$info);
174            }
175        }
176        return trim($info);
177    }
178
179    /**
180     * Convinience function to set nearly all available Data
181     * through one function
182     *
183     * @author Andreas Gohr <andi@splitbrain.org>
184     *
185     * @param string $field field name
186     * @param string $value
187     * @return bool success or fail
188     */
189    function setField($field, $value) {
190        if(strtolower(substr($field,0,5)) == 'iptc.'){
191            return $this->setIPTCField(substr($field,5),$value);
192        }elseif(strtolower(substr($field,0,5)) == 'exif.'){
193            return $this->setExifField(substr($field,5),$value);
194        }else{
195            return $this->setExifField($field,$value);
196        }
197    }
198
199    /**
200     * Convinience function to delete nearly all available Data
201     * through one function
202     *
203     * @author Andreas Gohr <andi@splitbrain.org>
204     *
205     * @param string $field field name
206     * @return bool
207     */
208    function deleteField($field) {
209        if(strtolower(substr($field,0,5)) == 'iptc.'){
210            return $this->deleteIPTCField(substr($field,5));
211        }elseif(strtolower(substr($field,0,5)) == 'exif.'){
212            return $this->deleteExifField(substr($field,5));
213        }else{
214            return $this->deleteExifField($field);
215        }
216    }
217
218    /**
219     * Return a date field
220     *
221     * @author Andreas Gohr <andi@splitbrain.org>
222     *
223     * @param string $field
224     * @return false|string
225     */
226    function getDateField($field) {
227        if (!isset($this->_info['dates'])) {
228            $this->_info['dates'] = $this->getDates();
229        }
230
231        if (isset($this->_info['dates'][$field])) {
232            return $this->_info['dates'][$field];
233        }
234
235        return false;
236    }
237
238    /**
239     * Return a file info field
240     *
241     * @author Andreas Gohr <andi@splitbrain.org>
242     *
243     * @param string $field field name
244     * @return false|string
245     */
246    function getFileField($field) {
247        if (!isset($this->_info['file'])) {
248            $this->_parseFileInfo();
249        }
250
251        if (isset($this->_info['file'][$field])) {
252            return $this->_info['file'][$field];
253        }
254
255        return false;
256    }
257
258    /**
259     * Return the camera info (Maker and Model)
260     *
261     * @author Andreas Gohr <andi@splitbrain.org>
262     * @todo   handle makernotes
263     *
264     * @return false|string
265     */
266    function getCamera(){
267        $make  = $this->getField(array('Exif.Make','Exif.TIFFMake'));
268        $model = $this->getField(array('Exif.Model','Exif.TIFFModel'));
269        $cam = trim("$make $model");
270        if(empty($cam)) return false;
271        return $cam;
272    }
273
274    /**
275     * Return shutter speed as a ratio
276     *
277     * @author Joe Lapp <joe.lapp@pobox.com>
278     *
279     * @return string
280     */
281    function getShutterSpeed() {
282        if (!isset($this->_info['exif'])) {
283            $this->_parseMarkerExif();
284        }
285        if(!isset($this->_info['exif']['ExposureTime'])){
286            return '';
287        }
288
289        $field = $this->_info['exif']['ExposureTime'];
290        if($field['den'] == 1) return $field['num'];
291        return $field['num'].'/'.$field['den'];
292    }
293
294    /**
295     * Return an EXIF field
296     *
297     * @author Sebastian Delmont <sdelmont@zonageek.com>
298     *
299     * @param string $field field name
300     * @return false|string
301     */
302    function getExifField($field) {
303        if (!isset($this->_info['exif'])) {
304            $this->_parseMarkerExif();
305        }
306
307        if ($this->_markers == null) {
308            return false;
309        }
310
311        if (isset($this->_info['exif'][$field])) {
312            return $this->_info['exif'][$field];
313        }
314
315        return false;
316    }
317
318    /**
319     * Return an XMP field
320     *
321     * @author Hakan Sandell <hakan.sandell@mydata.se>
322     *
323     * @param string $field field name
324     * @return false|string
325     */
326    function getXmpField($field) {
327        if (!isset($this->_info['xmp'])) {
328            $this->_parseMarkerXmp();
329        }
330
331        if ($this->_markers == null) {
332            return false;
333        }
334
335        if (isset($this->_info['xmp'][$field])) {
336            return $this->_info['xmp'][$field];
337        }
338
339        return false;
340    }
341
342    /**
343     * Return an Adobe Field
344     *
345     * @author Sebastian Delmont <sdelmont@zonageek.com>
346     *
347     * @param string $field field name
348     * @return false|string
349     */
350    function getAdobeField($field) {
351        if (!isset($this->_info['adobe'])) {
352            $this->_parseMarkerAdobe();
353        }
354
355        if ($this->_markers == null) {
356            return false;
357        }
358
359        if (isset($this->_info['adobe'][$field])) {
360            return $this->_info['adobe'][$field];
361        }
362
363        return false;
364    }
365
366    /**
367     * Return an IPTC field
368     *
369     * @author Sebastian Delmont <sdelmont@zonageek.com>
370     *
371     * @param string $field field name
372     * @return false|string
373     */
374    function getIPTCField($field) {
375        if (!isset($this->_info['iptc'])) {
376            $this->_parseMarkerAdobe();
377        }
378
379        if ($this->_markers == null) {
380            return false;
381        }
382
383        if (isset($this->_info['iptc'][$field])) {
384            return $this->_info['iptc'][$field];
385        }
386
387        return false;
388    }
389
390    /**
391     * Set an EXIF field
392     *
393     * @author Sebastian Delmont <sdelmont@zonageek.com>
394     * @author Joe Lapp <joe.lapp@pobox.com>
395     *
396     * @param string $field field name
397     * @param string $value
398     * @return bool
399     */
400    function setExifField($field, $value) {
401        if (!isset($this->_info['exif'])) {
402            $this->_parseMarkerExif();
403        }
404
405        if ($this->_markers == null) {
406            return false;
407        }
408
409        if ($this->_info['exif'] == false) {
410            $this->_info['exif'] = array();
411        }
412
413        // make sure datetimes are in correct format
414        if(strlen($field) >= 8 && strtolower(substr($field, 0, 8)) == 'datetime') {
415            if(strlen($value) < 8 || $value{4} != ':' || $value{7} != ':') {
416                $value = date('Y:m:d H:i:s', strtotime($value));
417            }
418        }
419
420        $this->_info['exif'][$field] = $value;
421
422        return true;
423    }
424
425    /**
426     * Set an Adobe Field
427     *
428     * @author Sebastian Delmont <sdelmont@zonageek.com>
429     *
430     * @param string $field field name
431     * @param string $value
432     * @return bool
433     */
434    function setAdobeField($field, $value) {
435        if (!isset($this->_info['adobe'])) {
436            $this->_parseMarkerAdobe();
437        }
438
439        if ($this->_markers == null) {
440            return false;
441        }
442
443        if ($this->_info['adobe'] == false) {
444            $this->_info['adobe'] = array();
445        }
446
447        $this->_info['adobe'][$field] = $value;
448
449        return true;
450    }
451
452    /**
453     * Calculates the multiplier needed to resize the image to the given
454     * dimensions
455     *
456     * @author Andreas Gohr <andi@splitbrain.org>
457     *
458     * @param int $maxwidth
459     * @param int $maxheight
460     * @return float|int
461     */
462    function getResizeRatio($maxwidth,$maxheight=0){
463        if(!$maxheight) $maxheight = $maxwidth;
464
465        $w = $this->getField('File.Width');
466        $h = $this->getField('File.Height');
467
468        $ratio = 1;
469        if($w >= $h){
470            if($w >= $maxwidth){
471                $ratio = $maxwidth/$w;
472            }elseif($h > $maxheight){
473                $ratio = $maxheight/$h;
474            }
475        }else{
476            if($h >= $maxheight){
477                $ratio = $maxheight/$h;
478            }elseif($w > $maxwidth){
479                $ratio = $maxwidth/$w;
480            }
481        }
482        return $ratio;
483    }
484
485
486    /**
487     * Set an IPTC field
488     *
489     * @author Sebastian Delmont <sdelmont@zonageek.com>
490     *
491     * @param string $field field name
492     * @param string $value
493     * @return bool
494     */
495    function setIPTCField($field, $value) {
496        if (!isset($this->_info['iptc'])) {
497            $this->_parseMarkerAdobe();
498        }
499
500        if ($this->_markers == null) {
501            return false;
502        }
503
504        if ($this->_info['iptc'] == false) {
505            $this->_info['iptc'] = array();
506        }
507
508        $this->_info['iptc'][$field] = $value;
509
510        return true;
511    }
512
513    /**
514     * Delete an EXIF field
515     *
516     * @author Sebastian Delmont <sdelmont@zonageek.com>
517     *
518     * @param string $field field name
519     * @return bool
520     */
521    function deleteExifField($field) {
522        if (!isset($this->_info['exif'])) {
523            $this->_parseMarkerAdobe();
524        }
525
526        if ($this->_markers == null) {
527            return false;
528        }
529
530        if ($this->_info['exif'] != false) {
531            unset($this->_info['exif'][$field]);
532        }
533
534        return true;
535    }
536
537    /**
538     * Delete an Adobe field
539     *
540     * @author Sebastian Delmont <sdelmont@zonageek.com>
541     *
542     * @param string $field field name
543     * @return bool
544     */
545    function deleteAdobeField($field) {
546        if (!isset($this->_info['adobe'])) {
547            $this->_parseMarkerAdobe();
548        }
549
550        if ($this->_markers == null) {
551            return false;
552        }
553
554        if ($this->_info['adobe'] != false) {
555            unset($this->_info['adobe'][$field]);
556        }
557
558        return true;
559    }
560
561    /**
562     * Delete an IPTC field
563     *
564     * @author Sebastian Delmont <sdelmont@zonageek.com>
565     *
566     * @param string $field field name
567     * @return bool
568     */
569    function deleteIPTCField($field) {
570        if (!isset($this->_info['iptc'])) {
571            $this->_parseMarkerAdobe();
572        }
573
574        if ($this->_markers == null) {
575            return false;
576        }
577
578        if ($this->_info['iptc'] != false) {
579            unset($this->_info['iptc'][$field]);
580        }
581
582        return true;
583    }
584
585    /**
586     * Get the image's title, tries various fields
587     *
588     * @param int $max maximum number chars (keeps words)
589     * @return false|string
590     *
591     * @author Andreas Gohr <andi@splitbrain.org>
592     */
593    function getTitle($max=80){
594        // try various fields
595        $cap = $this->getField(array('Iptc.Headline',
596                    'Iptc.Caption',
597                    'Xmp.dc:title',
598                    'Exif.UserComment',
599                    'Exif.TIFFUserComment',
600                    'Exif.TIFFImageDescription',
601                    'File.Name'));
602        if (empty($cap)) return false;
603
604        if(!$max) return $cap;
605        // Shorten to 80 chars (keeping words)
606        $new = preg_replace('/\n.+$/','',wordwrap($cap, $max));
607        if($new != $cap) $new .= '...';
608
609        return $new;
610    }
611
612    /**
613     * Gather various date fields
614     *
615     * @author Sebastian Delmont <sdelmont@zonageek.com>
616     *
617     * @return array|bool
618     */
619    function getDates() {
620        $this->_parseAll();
621        if ($this->_markers == null) {
622            if (@isset($this->_info['file']['UnixTime'])) {
623                $dates = array();
624                $dates['FileModified'] = $this->_info['file']['UnixTime'];
625                $dates['Time'] = $this->_info['file']['UnixTime'];
626                $dates['TimeSource'] = 'FileModified';
627                $dates['TimeStr'] = date("Y-m-d H:i:s", $this->_info['file']['UnixTime']);
628                $dates['EarliestTime'] = $this->_info['file']['UnixTime'];
629                $dates['EarliestTimeSource'] = 'FileModified';
630                $dates['EarliestTimeStr'] = date("Y-m-d H:i:s", $this->_info['file']['UnixTime']);
631                $dates['LatestTime'] = $this->_info['file']['UnixTime'];
632                $dates['LatestTimeSource'] = 'FileModified';
633                $dates['LatestTimeStr'] = date("Y-m-d H:i:s", $this->_info['file']['UnixTime']);
634                return $dates;
635            }
636            return false;
637        }
638
639        $dates = array();
640
641        $latestTime = 0;
642        $latestTimeSource = "";
643        $earliestTime = time();
644        $earliestTimeSource = "";
645
646        if (@isset($this->_info['exif']['DateTime'])) {
647            $dates['ExifDateTime'] = $this->_info['exif']['DateTime'];
648
649            $aux = $this->_info['exif']['DateTime'];
650            $aux{4} = "-";
651            $aux{7} = "-";
652            $t = strtotime($aux);
653
654            if ($t && $t > $latestTime) {
655                $latestTime = $t;
656                $latestTimeSource = "ExifDateTime";
657            }
658
659            if ($t && $t < $earliestTime) {
660                $earliestTime = $t;
661                $earliestTimeSource = "ExifDateTime";
662            }
663        }
664
665        if (@isset($this->_info['exif']['DateTimeOriginal'])) {
666            $dates['ExifDateTimeOriginal'] = $this->_info['exif']['DateTime'];
667
668            $aux = $this->_info['exif']['DateTimeOriginal'];
669            $aux{4} = "-";
670            $aux{7} = "-";
671            $t = strtotime($aux);
672
673            if ($t && $t > $latestTime) {
674                $latestTime = $t;
675                $latestTimeSource = "ExifDateTimeOriginal";
676            }
677
678            if ($t && $t < $earliestTime) {
679                $earliestTime = $t;
680                $earliestTimeSource = "ExifDateTimeOriginal";
681            }
682        }
683
684        if (@isset($this->_info['exif']['DateTimeDigitized'])) {
685            $dates['ExifDateTimeDigitized'] = $this->_info['exif']['DateTime'];
686
687            $aux = $this->_info['exif']['DateTimeDigitized'];
688            $aux{4} = "-";
689            $aux{7} = "-";
690            $t = strtotime($aux);
691
692            if ($t && $t > $latestTime) {
693                $latestTime = $t;
694                $latestTimeSource = "ExifDateTimeDigitized";
695            }
696
697            if ($t && $t < $earliestTime) {
698                $earliestTime = $t;
699                $earliestTimeSource = "ExifDateTimeDigitized";
700            }
701        }
702
703        if (@isset($this->_info['iptc']['DateCreated'])) {
704            $dates['IPTCDateCreated'] = $this->_info['iptc']['DateCreated'];
705
706            $aux = $this->_info['iptc']['DateCreated'];
707            $aux = substr($aux, 0, 4) . "-" . substr($aux, 4, 2) . "-" . substr($aux, 6, 2);
708            $t = strtotime($aux);
709
710            if ($t && $t > $latestTime) {
711                $latestTime = $t;
712                $latestTimeSource = "IPTCDateCreated";
713            }
714
715            if ($t && $t < $earliestTime) {
716                $earliestTime = $t;
717                $earliestTimeSource = "IPTCDateCreated";
718            }
719        }
720
721        if (@isset($this->_info['file']['UnixTime'])) {
722            $dates['FileModified'] = $this->_info['file']['UnixTime'];
723
724            $t = $this->_info['file']['UnixTime'];
725
726            if ($t && $t > $latestTime) {
727                $latestTime = $t;
728                $latestTimeSource = "FileModified";
729            }
730
731            if ($t && $t < $earliestTime) {
732                $earliestTime = $t;
733                $earliestTimeSource = "FileModified";
734            }
735        }
736
737        $dates['Time'] = $earliestTime;
738        $dates['TimeSource'] = $earliestTimeSource;
739        $dates['TimeStr'] = date("Y-m-d H:i:s", $earliestTime);
740        $dates['EarliestTime'] = $earliestTime;
741        $dates['EarliestTimeSource'] = $earliestTimeSource;
742        $dates['EarliestTimeStr'] = date("Y-m-d H:i:s", $earliestTime);
743        $dates['LatestTime'] = $latestTime;
744        $dates['LatestTimeSource'] = $latestTimeSource;
745        $dates['LatestTimeStr'] = date("Y-m-d H:i:s", $latestTime);
746
747        return $dates;
748    }
749
750    /**
751     * Get the image width, tries various fields
752     *
753     * @author Sebastian Delmont <sdelmont@zonageek.com>
754     *
755     * @return false|string
756     */
757    function getWidth() {
758        if (!isset($this->_info['sof'])) {
759            $this->_parseMarkerSOF();
760        }
761
762        if ($this->_markers == null) {
763            return false;
764        }
765
766        if (isset($this->_info['sof']['ImageWidth'])) {
767            return $this->_info['sof']['ImageWidth'];
768        }
769
770        if (!isset($this->_info['exif'])) {
771            $this->_parseMarkerExif();
772        }
773
774        if (isset($this->_info['exif']['PixelXDimension'])) {
775            return $this->_info['exif']['PixelXDimension'];
776        }
777
778        return false;
779    }
780
781    /**
782     * Get the image height, tries various fields
783     *
784     * @author Sebastian Delmont <sdelmont@zonageek.com>
785     *
786     * @return false|string
787     */
788    function getHeight() {
789        if (!isset($this->_info['sof'])) {
790            $this->_parseMarkerSOF();
791        }
792
793        if ($this->_markers == null) {
794            return false;
795        }
796
797        if (isset($this->_info['sof']['ImageHeight'])) {
798            return $this->_info['sof']['ImageHeight'];
799        }
800
801        if (!isset($this->_info['exif'])) {
802            $this->_parseMarkerExif();
803        }
804
805        if (isset($this->_info['exif']['PixelYDimension'])) {
806            return $this->_info['exif']['PixelYDimension'];
807        }
808
809        return false;
810    }
811
812    /**
813     * Get an dimension string for use in img tag
814     *
815     * @author Sebastian Delmont <sdelmont@zonageek.com>
816     *
817     * @return false|string
818     */
819    function getDimStr() {
820        if ($this->_markers == null) {
821            return false;
822        }
823
824        $w = $this->getWidth();
825        $h = $this->getHeight();
826
827        return "width='" . $w . "' height='" . $h . "'";
828    }
829
830    /**
831     * Checks for an embedded thumbnail
832     *
833     * @author Sebastian Delmont <sdelmont@zonageek.com>
834     *
835     * @param string $which possible values: 'any', 'exif' or 'adobe'
836     * @return false|string
837     */
838    function hasThumbnail($which = 'any') {
839        if (($which == 'any') || ($which == 'exif')) {
840            if (!isset($this->_info['exif'])) {
841                $this->_parseMarkerExif();
842            }
843
844            if ($this->_markers == null) {
845                return false;
846            }
847
848            if (isset($this->_info['exif']) && is_array($this->_info['exif'])) {
849                if (isset($this->_info['exif']['JFIFThumbnail'])) {
850                    return 'exif';
851                }
852            }
853        }
854
855        if ($which == 'adobe') {
856            if (!isset($this->_info['adobe'])) {
857                $this->_parseMarkerAdobe();
858            }
859
860            if ($this->_markers == null) {
861                return false;
862            }
863
864            if (isset($this->_info['adobe']) && is_array($this->_info['adobe'])) {
865                if (isset($this->_info['adobe']['ThumbnailData'])) {
866                    return 'exif';
867                }
868            }
869        }
870
871        return false;
872    }
873
874    /**
875     * Send embedded thumbnail to browser
876     *
877     * @author Sebastian Delmont <sdelmont@zonageek.com>
878     *
879     * @param string $which possible values: 'any', 'exif' or 'adobe'
880     * @return bool
881     */
882    function sendThumbnail($which = 'any') {
883        $data = null;
884
885        if (($which == 'any') || ($which == 'exif')) {
886            if (!isset($this->_info['exif'])) {
887                $this->_parseMarkerExif();
888            }
889
890            if ($this->_markers == null) {
891                return false;
892            }
893
894            if (isset($this->_info['exif']) && is_array($this->_info['exif'])) {
895                if (isset($this->_info['exif']['JFIFThumbnail'])) {
896                    $data =& $this->_info['exif']['JFIFThumbnail'];
897                }
898            }
899        }
900
901        if (($which == 'adobe') || ($data == null)){
902            if (!isset($this->_info['adobe'])) {
903                $this->_parseMarkerAdobe();
904            }
905
906            if ($this->_markers == null) {
907                return false;
908            }
909
910            if (isset($this->_info['adobe']) && is_array($this->_info['adobe'])) {
911                if (isset($this->_info['adobe']['ThumbnailData'])) {
912                    $data =& $this->_info['adobe']['ThumbnailData'];
913                }
914            }
915        }
916
917        if ($data != null) {
918            header("Content-type: image/jpeg");
919            echo $data;
920            return true;
921        }
922
923        return false;
924    }
925
926    /**
927     * Save changed Metadata
928     *
929     * @author Sebastian Delmont <sdelmont@zonageek.com>
930     * @author Andreas Gohr <andi@splitbrain.org>
931     *
932     * @param string $fileName file name or empty string for a random name
933     * @return bool
934     */
935    function save($fileName = "") {
936        if ($fileName == "") {
937            $tmpName = tempnam(dirname($this->_fileName),'_metatemp_');
938            $this->_writeJPEG($tmpName);
939            if (@file_exists($tmpName)) {
940                return io_rename($tmpName, $this->_fileName);
941            }
942        } else {
943            return $this->_writeJPEG($fileName);
944        }
945        return false;
946    }
947
948    /*************************************************************/
949    /* PRIVATE FUNCTIONS (Internal Use Only!)                    */
950    /*************************************************************/
951
952    /*************************************************************/
953    function _dispose($fileName = "") {
954        $this->_fileName = $fileName;
955
956        $this->_fp = null;
957        $this->_type = 'unknown';
958
959        unset($this->_markers);
960        unset($this->_info);
961    }
962
963    /*************************************************************/
964    function _readJPEG() {
965        unset($this->_markers);
966        //unset($this->_info);
967        $this->_markers = array();
968        //$this->_info = array();
969
970        $this->_fp = @fopen($this->_fileName, 'rb');
971        if ($this->_fp) {
972            if (file_exists($this->_fileName)) {
973                $this->_type = 'file';
974            }
975            else {
976                $this->_type = 'url';
977            }
978        } else {
979            $this->_fp = null;
980            return false;  // ERROR: Can't open file
981        }
982
983        // Check for the JPEG signature
984        $c1 = ord(fgetc($this->_fp));
985        $c2 = ord(fgetc($this->_fp));
986
987        if ($c1 != 0xFF || $c2 != 0xD8) {   // (0xFF + SOI)
988            $this->_markers = null;
989            return false;  // ERROR: File is not a JPEG
990        }
991
992        $count = 0;
993
994        $done = false;
995        $ok = true;
996
997        while (!$done) {
998            $capture = false;
999
1000            // First, skip any non 0xFF bytes
1001            $discarded = 0;
1002            $c = ord(fgetc($this->_fp));
1003            while (!feof($this->_fp) && ($c != 0xFF)) {
1004                $discarded++;
1005                $c = ord(fgetc($this->_fp));
1006            }
1007            // Then skip all 0xFF until the marker byte
1008            do {
1009                $marker = ord(fgetc($this->_fp));
1010            } while (!feof($this->_fp) && ($marker == 0xFF));
1011
1012            if (feof($this->_fp)) {
1013                return false; // ERROR: Unexpected EOF
1014            }
1015            if ($discarded != 0) {
1016                return false; // ERROR: Extraneous data
1017            }
1018
1019            $length = ord(fgetc($this->_fp)) * 256 + ord(fgetc($this->_fp));
1020            if (feof($this->_fp)) {
1021                return false; // ERROR: Unexpected EOF
1022            }
1023            if ($length < 2) {
1024                return false; // ERROR: Extraneous data
1025            }
1026            $length = $length - 2; // The length we got counts itself
1027
1028            switch ($marker) {
1029                case 0xC0:    // SOF0
1030                case 0xC1:    // SOF1
1031                case 0xC2:    // SOF2
1032                case 0xC9:    // SOF9
1033                case 0xE0:    // APP0: JFIF data
1034                case 0xE1:    // APP1: EXIF or XMP data
1035                case 0xED:    // APP13: IPTC / Photoshop data
1036                    $capture = true;
1037                    break;
1038                case 0xDA:    // SOS: Start of scan... the image itself and the last block on the file
1039                    $capture = false;
1040                    $length = -1;  // This field has no length... it includes all data until EOF
1041                    $done = true;
1042                    break;
1043                default:
1044                    $capture = true;//false;
1045                    break;
1046            }
1047
1048            $this->_markers[$count] = array();
1049            $this->_markers[$count]['marker'] = $marker;
1050            $this->_markers[$count]['length'] = $length;
1051
1052            if ($capture) {
1053                if ($length)
1054                    $this->_markers[$count]['data'] = fread($this->_fp, $length);
1055                else
1056                    $this->_markers[$count]['data'] = "";
1057            }
1058            elseif (!$done) {
1059                $result = @fseek($this->_fp, $length, SEEK_CUR);
1060                // fseek doesn't seem to like HTTP 'files', but fgetc has no problem
1061                if (!($result === 0)) {
1062                    for ($i = 0; $i < $length; $i++) {
1063                        fgetc($this->_fp);
1064                    }
1065                }
1066            }
1067            $count++;
1068        }
1069
1070        if ($this->_fp) {
1071            fclose($this->_fp);
1072            $this->_fp = null;
1073        }
1074
1075        return $ok;
1076    }
1077
1078    /*************************************************************/
1079    function _parseAll() {
1080        if (!isset($this->_info['file'])) {
1081            $this->_parseFileInfo();
1082        }
1083        if (!isset($this->_markers)) {
1084            $this->_readJPEG();
1085        }
1086
1087        if ($this->_markers == null) {
1088            return false;
1089        }
1090
1091        if (!isset($this->_info['jfif'])) {
1092            $this->_parseMarkerJFIF();
1093        }
1094        if (!isset($this->_info['jpeg'])) {
1095            $this->_parseMarkerSOF();
1096        }
1097        if (!isset($this->_info['exif'])) {
1098            $this->_parseMarkerExif();
1099        }
1100        if (!isset($this->_info['xmp'])) {
1101            $this->_parseMarkerXmp();
1102        }
1103        if (!isset($this->_info['adobe'])) {
1104            $this->_parseMarkerAdobe();
1105        }
1106    }
1107
1108    /*************************************************************/
1109    function _writeJPEG($outputName) {
1110        $this->_parseAll();
1111
1112        $wroteEXIF = false;
1113        $wroteAdobe = false;
1114
1115        $this->_fp = @fopen($this->_fileName, 'r');
1116        if ($this->_fp) {
1117            if (file_exists($this->_fileName)) {
1118                $this->_type = 'file';
1119            }
1120            else {
1121                $this->_type = 'url';
1122            }
1123        } else {
1124            $this->_fp = null;
1125            return false;  // ERROR: Can't open file
1126        }
1127
1128        $this->_fpout = fopen($outputName, 'wb');
1129        if (!$this->_fpout) {
1130            $this->_fpout = null;
1131            fclose($this->_fp);
1132            $this->_fp = null;
1133            return false;  // ERROR: Can't open output file
1134        }
1135
1136        // Check for the JPEG signature
1137        $c1 = ord(fgetc($this->_fp));
1138        $c2 = ord(fgetc($this->_fp));
1139
1140        if ($c1 != 0xFF || $c2 != 0xD8) {   // (0xFF + SOI)
1141            return false;  // ERROR: File is not a JPEG
1142        }
1143
1144        fputs($this->_fpout, chr(0xFF), 1);
1145        fputs($this->_fpout, chr(0xD8), 1); // (0xFF + SOI)
1146
1147        $count = 0;
1148
1149        $done = false;
1150        $ok = true;
1151
1152        while (!$done) {
1153            // First, skip any non 0xFF bytes
1154            $discarded = 0;
1155            $c = ord(fgetc($this->_fp));
1156            while (!feof($this->_fp) && ($c != 0xFF)) {
1157                $discarded++;
1158                $c = ord(fgetc($this->_fp));
1159            }
1160            // Then skip all 0xFF until the marker byte
1161            do {
1162                $marker = ord(fgetc($this->_fp));
1163            } while (!feof($this->_fp) && ($marker == 0xFF));
1164
1165            if (feof($this->_fp)) {
1166                $ok = false;
1167                break; // ERROR: Unexpected EOF
1168            }
1169            if ($discarded != 0) {
1170                $ok = false;
1171                break; // ERROR: Extraneous data
1172            }
1173
1174            $length = ord(fgetc($this->_fp)) * 256 + ord(fgetc($this->_fp));
1175            if (feof($this->_fp)) {
1176                $ok = false;
1177                break; // ERROR: Unexpected EOF
1178            }
1179            if ($length < 2) {
1180                $ok = false;
1181                break; // ERROR: Extraneous data
1182            }
1183            $length = $length - 2; // The length we got counts itself
1184
1185            unset($data);
1186            if ($marker == 0xE1) { // APP1: EXIF data
1187                $data =& $this->_createMarkerEXIF();
1188                $wroteEXIF = true;
1189            }
1190            elseif ($marker == 0xED) { // APP13: IPTC / Photoshop data
1191                $data =& $this->_createMarkerAdobe();
1192                $wroteAdobe = true;
1193            }
1194            elseif ($marker == 0xDA) { // SOS: Start of scan... the image itself and the last block on the file
1195                $done = true;
1196            }
1197
1198            if (!$wroteEXIF && (($marker < 0xE0) || ($marker > 0xEF))) {
1199                if (isset($this->_info['exif']) && is_array($this->_info['exif'])) {
1200                    $exif =& $this->_createMarkerEXIF();
1201                    $this->_writeJPEGMarker(0xE1, strlen($exif), $exif, 0);
1202                    unset($exif);
1203                }
1204                $wroteEXIF = true;
1205            }
1206
1207            if (!$wroteAdobe && (($marker < 0xE0) || ($marker > 0xEF))) {
1208                if ((isset($this->_info['adobe']) && is_array($this->_info['adobe']))
1209                        || (isset($this->_info['iptc']) && is_array($this->_info['iptc']))) {
1210                    $adobe =& $this->_createMarkerAdobe();
1211                    $this->_writeJPEGMarker(0xED, strlen($adobe), $adobe, 0);
1212                    unset($adobe);
1213                }
1214                $wroteAdobe = true;
1215            }
1216
1217            $origLength = $length;
1218            if (isset($data)) {
1219                $length = strlen($data);
1220            }
1221
1222            if ($marker != -1) {
1223                $this->_writeJPEGMarker($marker, $length, $data, $origLength);
1224            }
1225        }
1226
1227        if ($this->_fp) {
1228            fclose($this->_fp);
1229            $this->_fp = null;
1230        }
1231
1232        if ($this->_fpout) {
1233            fclose($this->_fpout);
1234            $this->_fpout = null;
1235        }
1236
1237        return $ok;
1238    }
1239
1240    /*************************************************************/
1241    function _writeJPEGMarker($marker, $length, &$data, $origLength) {
1242        if ($length <= 0) {
1243            return false;
1244        }
1245
1246        fputs($this->_fpout, chr(0xFF), 1);
1247        fputs($this->_fpout, chr($marker), 1);
1248        fputs($this->_fpout, chr((($length + 2) & 0x0000FF00) >> 8), 1);
1249        fputs($this->_fpout, chr((($length + 2) & 0x000000FF) >> 0), 1);
1250
1251        if (isset($data)) {
1252            // Copy the generated data
1253            fputs($this->_fpout, $data, $length);
1254
1255            if ($origLength > 0) {   // Skip the original data
1256                $result = @fseek($this->_fp, $origLength, SEEK_CUR);
1257                // fseek doesn't seem to like HTTP 'files', but fgetc has no problem
1258                if ($result != 0) {
1259                    for ($i = 0; $i < $origLength; $i++) {
1260                        fgetc($this->_fp);
1261                    }
1262                }
1263            }
1264        } else {
1265            if ($marker == 0xDA) {  // Copy until EOF
1266                while (!feof($this->_fp)) {
1267                    $data = fread($this->_fp, 1024 * 16);
1268                    fputs($this->_fpout, $data, strlen($data));
1269                }
1270            } else { // Copy only $length bytes
1271                $data = @fread($this->_fp, $length);
1272                fputs($this->_fpout, $data, $length);
1273            }
1274        }
1275
1276        return true;
1277    }
1278
1279    /**
1280     * Gets basic info from the file - should work with non-JPEGs
1281     *
1282     * @author  Sebastian Delmont <sdelmont@zonageek.com>
1283     * @author  Andreas Gohr <andi@splitbrain.org>
1284     */
1285    function _parseFileInfo() {
1286        if (file_exists($this->_fileName) && is_file($this->_fileName)) {
1287            $this->_info['file'] = array();
1288            $this->_info['file']['Name'] = utf8_decodeFN(utf8_basename($this->_fileName));
1289            $this->_info['file']['Path'] = fullpath($this->_fileName);
1290            $this->_info['file']['Size'] = filesize($this->_fileName);
1291            if ($this->_info['file']['Size'] < 1024) {
1292                $this->_info['file']['NiceSize'] = $this->_info['file']['Size'] . 'B';
1293            } elseif ($this->_info['file']['Size'] < (1024 * 1024)) {
1294                $this->_info['file']['NiceSize'] = round($this->_info['file']['Size'] / 1024) . 'KB';
1295            } elseif ($this->_info['file']['Size'] < (1024 * 1024 * 1024)) {
1296                $this->_info['file']['NiceSize'] = round($this->_info['file']['Size'] / (1024*1024)) . 'MB';
1297            } else {
1298                $this->_info['file']['NiceSize'] = $this->_info['file']['Size'] . 'B';
1299            }
1300            $this->_info['file']['UnixTime'] = filemtime($this->_fileName);
1301
1302            // get image size directly from file
1303            $size = getimagesize($this->_fileName);
1304            $this->_info['file']['Width']  = $size[0];
1305            $this->_info['file']['Height'] = $size[1];
1306            // set mime types and formats
1307            // http://www.php.net/manual/en/function.getimagesize.php
1308            // http://www.php.net/manual/en/function.image-type-to-mime-type.php
1309            switch ($size[2]){
1310                case 1:
1311                    $this->_info['file']['Mime']   = 'image/gif';
1312                    $this->_info['file']['Format'] = 'GIF';
1313                    break;
1314                case 2:
1315                    $this->_info['file']['Mime']   = 'image/jpeg';
1316                    $this->_info['file']['Format'] = 'JPEG';
1317                    break;
1318                case 3:
1319                    $this->_info['file']['Mime']   = 'image/png';
1320                    $this->_info['file']['Format'] = 'PNG';
1321                    break;
1322                case 4:
1323                    $this->_info['file']['Mime']   = 'application/x-shockwave-flash';
1324                    $this->_info['file']['Format'] = 'SWF';
1325                    break;
1326                case 5:
1327                    $this->_info['file']['Mime']   = 'image/psd';
1328                    $this->_info['file']['Format'] = 'PSD';
1329                    break;
1330                case 6:
1331                    $this->_info['file']['Mime']   = 'image/bmp';
1332                    $this->_info['file']['Format'] = 'BMP';
1333                    break;
1334                case 7:
1335                    $this->_info['file']['Mime']   = 'image/tiff';
1336                    $this->_info['file']['Format'] = 'TIFF (Intel)';
1337                    break;
1338                case 8:
1339                    $this->_info['file']['Mime']   = 'image/tiff';
1340                    $this->_info['file']['Format'] = 'TIFF (Motorola)';
1341                    break;
1342                case 9:
1343                    $this->_info['file']['Mime']   = 'application/octet-stream';
1344                    $this->_info['file']['Format'] = 'JPC';
1345                    break;
1346                case 10:
1347                    $this->_info['file']['Mime']   = 'image/jp2';
1348                    $this->_info['file']['Format'] = 'JP2';
1349                    break;
1350                case 11:
1351                    $this->_info['file']['Mime']   = 'application/octet-stream';
1352                    $this->_info['file']['Format'] = 'JPX';
1353                    break;
1354                case 12:
1355                    $this->_info['file']['Mime']   = 'application/octet-stream';
1356                    $this->_info['file']['Format'] = 'JB2';
1357                    break;
1358                case 13:
1359                    $this->_info['file']['Mime']   = 'application/x-shockwave-flash';
1360                    $this->_info['file']['Format'] = 'SWC';
1361                    break;
1362                case 14:
1363                    $this->_info['file']['Mime']   = 'image/iff';
1364                    $this->_info['file']['Format'] = 'IFF';
1365                    break;
1366                case 15:
1367                    $this->_info['file']['Mime']   = 'image/vnd.wap.wbmp';
1368                    $this->_info['file']['Format'] = 'WBMP';
1369                    break;
1370                case 16:
1371                    $this->_info['file']['Mime']   = 'image/xbm';
1372                    $this->_info['file']['Format'] = 'XBM';
1373                    break;
1374                default:
1375                    $this->_info['file']['Mime']   = 'image/unknown';
1376            }
1377        } else {
1378            $this->_info['file'] = array();
1379            $this->_info['file']['Name'] = utf8_basename($this->_fileName);
1380            $this->_info['file']['Url'] = $this->_fileName;
1381        }
1382
1383        return true;
1384    }
1385
1386    /*************************************************************/
1387    function _parseMarkerJFIF() {
1388        if (!isset($this->_markers)) {
1389            $this->_readJPEG();
1390        }
1391
1392        if ($this->_markers == null) {
1393            return false;
1394        }
1395
1396        $data = null;
1397        $count = count($this->_markers);
1398        for ($i = 0; $i < $count; $i++) {
1399            if ($this->_markers[$i]['marker'] == 0xE0) {
1400                $signature = $this->_getFixedString($this->_markers[$i]['data'], 0, 4);
1401                if ($signature == 'JFIF') {
1402                    $data =& $this->_markers[$i]['data'];
1403                    break;
1404                }
1405            }
1406        }
1407
1408        if ($data == null) {
1409            $this->_info['jfif'] = false;
1410            return false;
1411        }
1412
1413        $this->_info['jfif'] = array();
1414
1415        $vmaj = $this->_getByte($data, 5);
1416        $vmin = $this->_getByte($data, 6);
1417
1418        $this->_info['jfif']['Version'] = sprintf('%d.%02d', $vmaj, $vmin);
1419
1420        $units = $this->_getByte($data, 7);
1421        switch ($units) {
1422            case 0:
1423                $this->_info['jfif']['Units'] = 'pixels';
1424                break;
1425            case 1:
1426                $this->_info['jfif']['Units'] = 'dpi';
1427                break;
1428            case 2:
1429                $this->_info['jfif']['Units'] = 'dpcm';
1430                break;
1431            default:
1432                $this->_info['jfif']['Units'] = 'unknown';
1433                break;
1434        }
1435
1436        $xdens = $this->_getShort($data, 8);
1437        $ydens = $this->_getShort($data, 10);
1438
1439        $this->_info['jfif']['XDensity'] = $xdens;
1440        $this->_info['jfif']['YDensity'] = $ydens;
1441
1442        $thumbx = $this->_getByte($data, 12);
1443        $thumby = $this->_getByte($data, 13);
1444
1445        $this->_info['jfif']['ThumbnailWidth'] = $thumbx;
1446        $this->_info['jfif']['ThumbnailHeight'] = $thumby;
1447
1448        return true;
1449    }
1450
1451    /*************************************************************/
1452    function _parseMarkerSOF() {
1453        if (!isset($this->_markers)) {
1454            $this->_readJPEG();
1455        }
1456
1457        if ($this->_markers == null) {
1458            return false;
1459        }
1460
1461        $data = null;
1462        $count = count($this->_markers);
1463        for ($i = 0; $i < $count; $i++) {
1464            switch ($this->_markers[$i]['marker']) {
1465                case 0xC0: // SOF0
1466                case 0xC1: // SOF1
1467                case 0xC2: // SOF2
1468                case 0xC9: // SOF9
1469                    $data =& $this->_markers[$i]['data'];
1470                    $marker = $this->_markers[$i]['marker'];
1471                    break;
1472            }
1473        }
1474
1475        if ($data == null) {
1476            $this->_info['sof'] = false;
1477            return false;
1478        }
1479
1480        $pos = 0;
1481        $this->_info['sof'] = array();
1482
1483        switch ($marker) {
1484            case 0xC0: // SOF0
1485                $format = 'Baseline';
1486                break;
1487            case 0xC1: // SOF1
1488                $format = 'Progessive';
1489                break;
1490            case 0xC2: // SOF2
1491                $format = 'Non-baseline';
1492                break;
1493            case 0xC9: // SOF9
1494                $format = 'Arithmetic';
1495                break;
1496            default:
1497                return false;
1498        }
1499
1500        $this->_info['sof']['Format']          = $format;
1501        $this->_info['sof']['SamplePrecision'] = $this->_getByte($data, $pos + 0);
1502        $this->_info['sof']['ImageHeight']     = $this->_getShort($data, $pos + 1);
1503        $this->_info['sof']['ImageWidth']      = $this->_getShort($data, $pos + 3);
1504        $this->_info['sof']['ColorChannels']   = $this->_getByte($data, $pos + 5);
1505
1506        return true;
1507    }
1508
1509    /**
1510     * Parses the XMP data
1511     *
1512     * @author  Hakan Sandell <hakan.sandell@mydata.se>
1513     */
1514    function _parseMarkerXmp() {
1515        if (!isset($this->_markers)) {
1516            $this->_readJPEG();
1517        }
1518
1519        if ($this->_markers == null) {
1520            return false;
1521        }
1522
1523        $data = null;
1524        $count = count($this->_markers);
1525        for ($i = 0; $i < $count; $i++) {
1526            if ($this->_markers[$i]['marker'] == 0xE1) {
1527                $signature = $this->_getFixedString($this->_markers[$i]['data'], 0, 29);
1528                if ($signature == "http://ns.adobe.com/xap/1.0/\0") {
1529                    $data = substr($this->_markers[$i]['data'], 29);
1530                    break;
1531                }
1532            }
1533        }
1534
1535        if ($data == null) {
1536            $this->_info['xmp'] = false;
1537            return false;
1538        }
1539
1540        $parser = xml_parser_create();
1541        xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
1542        xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1);
1543        $result = xml_parse_into_struct($parser, $data, $values, $tags);
1544        xml_parser_free($parser);
1545
1546        if ($result == 0) {
1547            $this->_info['xmp'] = false;
1548            return false;
1549        }
1550
1551        $this->_info['xmp'] = array();
1552        $count = count($values);
1553        for ($i = 0; $i < $count; $i++) {
1554            if ($values[$i]['tag'] == 'rdf:Description' && $values[$i]['type'] == 'open') {
1555
1556                while ((++$i < $count) && ($values[$i]['tag'] != 'rdf:Description')) {
1557                    $this->_parseXmpNode($values, $i, $this->_info['xmp'][$values[$i]['tag']], $count);
1558                }
1559            }
1560        }
1561        return true;
1562    }
1563
1564    /**
1565     * Parses XMP nodes by recursion
1566     *
1567     * @author  Hakan Sandell <hakan.sandell@mydata.se>
1568     */
1569    function _parseXmpNode($values, &$i, &$meta, $count) {
1570        if ($values[$i]['type'] == 'close') return;
1571
1572        if ($values[$i]['type'] == 'complete') {
1573            // Simple Type property
1574            $meta = $values[$i]['value'];
1575            return;
1576        }
1577
1578        $i++;
1579        if ($i >= $count) return;
1580
1581        if ($values[$i]['tag'] == 'rdf:Bag' || $values[$i]['tag'] == 'rdf:Seq') {
1582            // Array property
1583            $meta = array();
1584            while ($values[++$i]['tag'] == 'rdf:li') {
1585                $this->_parseXmpNode($values, $i, $meta[], $count);
1586            }
1587            $i++; // skip closing Bag/Seq tag
1588
1589        } elseif ($values[$i]['tag'] == 'rdf:Alt') {
1590            // Language Alternative property, only the first (default) value is used
1591            if ($values[$i]['type'] == 'open') {
1592                $i++;
1593                $this->_parseXmpNode($values, $i, $meta, $count);
1594                while ((++$i < $count) && ($values[$i]['tag'] != 'rdf:Alt'));
1595                $i++; // skip closing Alt tag
1596            }
1597
1598        } else {
1599            // Structure property
1600            $meta = array();
1601            $startTag = $values[$i-1]['tag'];
1602            do {
1603                $this->_parseXmpNode($values, $i, $meta[$values[$i]['tag']], $count);
1604            } while ((++$i < $count) && ($values[$i]['tag'] != $startTag));
1605        }
1606    }
1607
1608    /*************************************************************/
1609    function _parseMarkerExif() {
1610        if (!isset($this->_markers)) {
1611            $this->_readJPEG();
1612        }
1613
1614        if ($this->_markers == null) {
1615            return false;
1616        }
1617
1618        $data = null;
1619        $count = count($this->_markers);
1620        for ($i = 0; $i < $count; $i++) {
1621            if ($this->_markers[$i]['marker'] == 0xE1) {
1622                $signature = $this->_getFixedString($this->_markers[$i]['data'], 0, 6);
1623                if ($signature == "Exif\0\0") {
1624                    $data =& $this->_markers[$i]['data'];
1625                    break;
1626                }
1627            }
1628        }
1629
1630        if ($data == null) {
1631            $this->_info['exif'] = false;
1632            return false;
1633        }
1634        $pos = 6;
1635        $this->_info['exif'] = array();
1636
1637        // We don't increment $pos after this because Exif uses offsets relative to this point
1638
1639        $byteAlign = $this->_getShort($data, $pos + 0);
1640
1641        if ($byteAlign == 0x4949) { // "II"
1642            $isBigEndian = false;
1643        } elseif ($byteAlign == 0x4D4D) { // "MM"
1644            $isBigEndian = true;
1645        } else {
1646            return false; // Unexpected data
1647        }
1648
1649        $alignCheck = $this->_getShort($data, $pos + 2, $isBigEndian);
1650        if ($alignCheck != 0x002A) // That's the expected value
1651            return false; // Unexpected data
1652
1653        if ($isBigEndian) {
1654            $this->_info['exif']['ByteAlign'] = "Big Endian";
1655        } else {
1656            $this->_info['exif']['ByteAlign'] = "Little Endian";
1657        }
1658
1659        $offsetIFD0 = $this->_getLong($data, $pos + 4, $isBigEndian);
1660        if ($offsetIFD0 < 8)
1661            return false; // Unexpected data
1662
1663        $offsetIFD1 = $this->_readIFD($data, $pos, $offsetIFD0, $isBigEndian, 'ifd0');
1664        if ($offsetIFD1 != 0)
1665            $this->_readIFD($data, $pos, $offsetIFD1, $isBigEndian, 'ifd1');
1666
1667        return true;
1668    }
1669
1670    /*************************************************************/
1671    function _readIFD($data, $base, $offset, $isBigEndian, $mode) {
1672        $EXIFTags = $this->_exifTagNames($mode);
1673
1674        $numEntries = $this->_getShort($data, $base + $offset, $isBigEndian);
1675        $offset += 2;
1676
1677        $exifTIFFOffset = 0;
1678        $exifTIFFLength = 0;
1679        $exifThumbnailOffset = 0;
1680        $exifThumbnailLength = 0;
1681
1682        for ($i = 0; $i < $numEntries; $i++) {
1683            $tag = $this->_getShort($data, $base + $offset, $isBigEndian);
1684            $offset += 2;
1685            $type = $this->_getShort($data, $base + $offset, $isBigEndian);
1686            $offset += 2;
1687            $count = $this->_getLong($data, $base + $offset, $isBigEndian);
1688            $offset += 4;
1689
1690            if (($type < 1) || ($type > 12))
1691                return false; // Unexpected Type
1692
1693            $typeLengths = array( -1, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8 );
1694
1695            $dataLength = $typeLengths[$type] * $count;
1696            if ($dataLength > 4) {
1697                $dataOffset = $this->_getLong($data, $base + $offset, $isBigEndian);
1698                $rawValue = $this->_getFixedString($data, $base + $dataOffset, $dataLength);
1699            } else {
1700                $rawValue = $this->_getFixedString($data, $base + $offset, $dataLength);
1701            }
1702            $offset += 4;
1703
1704            switch ($type) {
1705                case 1:    // UBYTE
1706                    if ($count == 1) {
1707                        $value = $this->_getByte($rawValue, 0);
1708                    } else {
1709                        $value = array();
1710                        for ($j = 0; $j < $count; $j++)
1711                            $value[$j] = $this->_getByte($rawValue, $j);
1712                    }
1713                    break;
1714                case 2:    // ASCII
1715                    $value = $rawValue;
1716                    break;
1717                case 3:    // USHORT
1718                    if ($count == 1) {
1719                        $value = $this->_getShort($rawValue, 0, $isBigEndian);
1720                    } else {
1721                        $value = array();
1722                        for ($j = 0; $j < $count; $j++)
1723                            $value[$j] = $this->_getShort($rawValue, $j * 2, $isBigEndian);
1724                    }
1725                    break;
1726                case 4:    // ULONG
1727                    if ($count == 1) {
1728                        $value = $this->_getLong($rawValue, 0, $isBigEndian);
1729                    } else {
1730                        $value = array();
1731                        for ($j = 0; $j < $count; $j++)
1732                            $value[$j] = $this->_getLong($rawValue, $j * 4, $isBigEndian);
1733                    }
1734                    break;
1735                case 5:    // URATIONAL
1736                    if ($count == 1) {
1737                        $a = $this->_getLong($rawValue, 0, $isBigEndian);
1738                        $b = $this->_getLong($rawValue, 4, $isBigEndian);
1739                        $value = array();
1740                        $value['val'] = 0;
1741                        $value['num'] = $a;
1742                        $value['den'] = $b;
1743                        if (($a != 0) && ($b != 0)) {
1744                            $value['val'] = $a / $b;
1745                        }
1746                    } else {
1747                        $value = array();
1748                        for ($j = 0; $j < $count; $j++) {
1749                            $a = $this->_getLong($rawValue, $j * 8, $isBigEndian);
1750                            $b = $this->_getLong($rawValue, ($j * 8) + 4, $isBigEndian);
1751                            $value = array();
1752                            $value[$j]['val'] = 0;
1753                            $value[$j]['num'] = $a;
1754                            $value[$j]['den'] = $b;
1755                            if (($a != 0) && ($b != 0))
1756                                $value[$j]['val'] = $a / $b;
1757                        }
1758                    }
1759                    break;
1760                case 6:    // SBYTE
1761                    if ($count == 1) {
1762                        $value = $this->_getByte($rawValue, 0);
1763                    } else {
1764                        $value = array();
1765                        for ($j = 0; $j < $count; $j++)
1766                            $value[$j] = $this->_getByte($rawValue, $j);
1767                    }
1768                    break;
1769                case 7:    // UNDEFINED
1770                    $value = $rawValue;
1771                    break;
1772                case 8:    // SSHORT
1773                    if ($count == 1) {
1774                        $value = $this->_getShort($rawValue, 0, $isBigEndian);
1775                    } else {
1776                        $value = array();
1777                        for ($j = 0; $j < $count; $j++)
1778                            $value[$j] = $this->_getShort($rawValue, $j * 2, $isBigEndian);
1779                    }
1780                    break;
1781                case 9:    // SLONG
1782                    if ($count == 1) {
1783                        $value = $this->_getLong($rawValue, 0, $isBigEndian);
1784                    } else {
1785                        $value = array();
1786                        for ($j = 0; $j < $count; $j++)
1787                            $value[$j] = $this->_getLong($rawValue, $j * 4, $isBigEndian);
1788                    }
1789                    break;
1790                case 10:   // SRATIONAL
1791                    if ($count == 1) {
1792                        $a = $this->_getLong($rawValue, 0, $isBigEndian);
1793                        $b = $this->_getLong($rawValue, 4, $isBigEndian);
1794                        $value = array();
1795                        $value['val'] = 0;
1796                        $value['num'] = $a;
1797                        $value['den'] = $b;
1798                        if (($a != 0) && ($b != 0))
1799                            $value['val'] = $a / $b;
1800                    } else {
1801                        $value = array();
1802                        for ($j = 0; $j < $count; $j++) {
1803                            $a = $this->_getLong($rawValue, $j * 8, $isBigEndian);
1804                            $b = $this->_getLong($rawValue, ($j * 8) + 4, $isBigEndian);
1805                            $value = array();
1806                            $value[$j]['val'] = 0;
1807                            $value[$j]['num'] = $a;
1808                            $value[$j]['den'] = $b;
1809                            if (($a != 0) && ($b != 0))
1810                                $value[$j]['val'] = $a / $b;
1811                        }
1812                    }
1813                    break;
1814                case 11:   // FLOAT
1815                    $value = $rawValue;
1816                    break;
1817
1818                case 12:   // DFLOAT
1819                    $value = $rawValue;
1820                    break;
1821                default:
1822                    return false; // Unexpected Type
1823            }
1824
1825            $tagName = '';
1826            if (($mode == 'ifd0') && ($tag == 0x8769)) {  // ExifIFDOffset
1827                $this->_readIFD($data, $base, $value, $isBigEndian, 'exif');
1828            } elseif (($mode == 'ifd0') && ($tag == 0x8825)) {  // GPSIFDOffset
1829                $this->_readIFD($data, $base, $value, $isBigEndian, 'gps');
1830            } elseif (($mode == 'ifd1') && ($tag == 0x0111)) {  // TIFFStripOffsets
1831                $exifTIFFOffset = $value;
1832            } elseif (($mode == 'ifd1') && ($tag == 0x0117)) {  // TIFFStripByteCounts
1833                $exifTIFFLength = $value;
1834            } elseif (($mode == 'ifd1') && ($tag == 0x0201)) {  // TIFFJFIFOffset
1835                $exifThumbnailOffset = $value;
1836            } elseif (($mode == 'ifd1') && ($tag == 0x0202)) {  // TIFFJFIFLength
1837                $exifThumbnailLength = $value;
1838            } elseif (($mode == 'exif') && ($tag == 0xA005)) {  // InteropIFDOffset
1839                $this->_readIFD($data, $base, $value, $isBigEndian, 'interop');
1840            }
1841            // elseif (($mode == 'exif') && ($tag == 0x927C)) {  // MakerNote
1842            // }
1843            else {
1844                if (isset($EXIFTags[$tag])) {
1845                    $tagName = $EXIFTags[$tag];
1846                    if (isset($this->_info['exif'][$tagName])) {
1847                        if (!is_array($this->_info['exif'][$tagName])) {
1848                            $aux = array();
1849                            $aux[0] = $this->_info['exif'][$tagName];
1850                            $this->_info['exif'][$tagName] = $aux;
1851                        }
1852
1853                        $this->_info['exif'][$tagName][count($this->_info['exif'][$tagName])] = $value;
1854                    } else {
1855                        $this->_info['exif'][$tagName] = $value;
1856                    }
1857                }
1858                /*
1859                 else {
1860                    echo sprintf("<h1>Unknown tag %02x (t: %d l: %d) %s in %s</h1>", $tag, $type, $count, $mode, $this->_fileName);
1861                    // Unknown Tags will be ignored!!!
1862                    // That's because the tag might be a pointer (like the Exif tag)
1863                    // and saving it without saving the data it points to might
1864                    // create an invalid file.
1865                }
1866                */
1867            }
1868        }
1869
1870        if (($exifThumbnailOffset > 0) && ($exifThumbnailLength > 0)) {
1871            $this->_info['exif']['JFIFThumbnail'] = $this->_getFixedString($data, $base + $exifThumbnailOffset, $exifThumbnailLength);
1872        }
1873
1874        if (($exifTIFFOffset > 0) && ($exifTIFFLength > 0)) {
1875            $this->_info['exif']['TIFFStrips'] = $this->_getFixedString($data, $base + $exifTIFFOffset, $exifTIFFLength);
1876        }
1877
1878        $nextOffset = $this->_getLong($data, $base + $offset, $isBigEndian);
1879        return $nextOffset;
1880    }
1881
1882    /*************************************************************/
1883    function & _createMarkerExif() {
1884        $data = null;
1885        $count = count($this->_markers);
1886        for ($i = 0; $i < $count; $i++) {
1887            if ($this->_markers[$i]['marker'] == 0xE1) {
1888                $signature = $this->_getFixedString($this->_markers[$i]['data'], 0, 6);
1889                if ($signature == "Exif\0\0") {
1890                    $data =& $this->_markers[$i]['data'];
1891                    break;
1892                }
1893            }
1894        }
1895
1896        if (!isset($this->_info['exif'])) {
1897            return false;
1898        }
1899
1900        $data = "Exif\0\0";
1901        $pos = 6;
1902        $offsetBase = 6;
1903
1904        if (isset($this->_info['exif']['ByteAlign']) && ($this->_info['exif']['ByteAlign'] == "Big Endian")) {
1905            $isBigEndian = true;
1906            $aux = "MM";
1907            $pos = $this->_putString($data, $pos, $aux);
1908        } else {
1909            $isBigEndian = false;
1910            $aux = "II";
1911            $pos = $this->_putString($data, $pos, $aux);
1912        }
1913        $pos = $this->_putShort($data, $pos, 0x002A, $isBigEndian);
1914        $pos = $this->_putLong($data, $pos, 0x00000008, $isBigEndian); // IFD0 Offset is always 8
1915
1916        $ifd0 =& $this->_getIFDEntries($isBigEndian, 'ifd0');
1917        $ifd1 =& $this->_getIFDEntries($isBigEndian, 'ifd1');
1918
1919        $pos = $this->_writeIFD($data, $pos, $offsetBase, $ifd0, $isBigEndian, true);
1920        $pos = $this->_writeIFD($data, $pos, $offsetBase, $ifd1, $isBigEndian, false);
1921
1922        return $data;
1923    }
1924
1925    /*************************************************************/
1926    function _writeIFD(&$data, $pos, $offsetBase, &$entries, $isBigEndian, $hasNext) {
1927        $tiffData = null;
1928        $tiffDataOffsetPos = -1;
1929
1930        $entryCount = count($entries);
1931
1932        $dataPos = $pos + 2 + ($entryCount * 12) + 4;
1933        $pos = $this->_putShort($data, $pos, $entryCount, $isBigEndian);
1934
1935        for ($i = 0; $i < $entryCount; $i++) {
1936            $tag = $entries[$i]['tag'];
1937            $type = $entries[$i]['type'];
1938
1939            if ($type == -99) { // SubIFD
1940                $pos = $this->_putShort($data, $pos, $tag, $isBigEndian);
1941                $pos = $this->_putShort($data, $pos, 0x04, $isBigEndian); // LONG
1942                $pos = $this->_putLong($data, $pos, 0x01, $isBigEndian); // Count = 1
1943                $pos = $this->_putLong($data, $pos, $dataPos - $offsetBase, $isBigEndian);
1944
1945                $dataPos = $this->_writeIFD($data, $dataPos, $offsetBase, $entries[$i]['value'], $isBigEndian, false);
1946            } elseif ($type == -98) { // TIFF Data
1947                $pos = $this->_putShort($data, $pos, $tag, $isBigEndian);
1948                $pos = $this->_putShort($data, $pos, 0x04, $isBigEndian); // LONG
1949                $pos = $this->_putLong($data, $pos, 0x01, $isBigEndian); // Count = 1
1950                $tiffDataOffsetPos = $pos;
1951                $pos = $this->_putLong($data, $pos, 0x00, $isBigEndian); // For Now
1952                $tiffData =& $entries[$i]['value'] ;
1953            } else { // Regular Entry
1954                $pos = $this->_putShort($data, $pos, $tag, $isBigEndian);
1955                $pos = $this->_putShort($data, $pos, $type, $isBigEndian);
1956                $pos = $this->_putLong($data, $pos, $entries[$i]['count'], $isBigEndian);
1957                if (strlen($entries[$i]['value']) > 4) {
1958                    $pos = $this->_putLong($data, $pos, $dataPos - $offsetBase, $isBigEndian);
1959                    $dataPos = $this->_putString($data, $dataPos, $entries[$i]['value']);
1960                } else {
1961                    $val = str_pad($entries[$i]['value'], 4, "\0");
1962                    $pos = $this->_putString($data, $pos, $val);
1963                }
1964            }
1965        }
1966
1967        if ($tiffData != null) {
1968            $this->_putLong($data, $tiffDataOffsetPos, $dataPos - $offsetBase, $isBigEndian);
1969            $dataPos = $this->_putString($data, $dataPos, $tiffData);
1970        }
1971
1972        if ($hasNext) {
1973            $pos = $this->_putLong($data, $pos, $dataPos - $offsetBase, $isBigEndian);
1974        } else {
1975            $pos = $this->_putLong($data, $pos, 0, $isBigEndian);
1976        }
1977
1978        return $dataPos;
1979    }
1980
1981    /*************************************************************/
1982    function & _getIFDEntries($isBigEndian, $mode) {
1983        $EXIFNames = $this->_exifTagNames($mode);
1984        $EXIFTags = $this->_exifNameTags($mode);
1985        $EXIFTypeInfo = $this->_exifTagTypes($mode);
1986
1987        $ifdEntries = array();
1988        $entryCount = 0;
1989
1990        reset($EXIFNames);
1991        while (list($tag, $name) = each($EXIFNames)) {
1992            $type = $EXIFTypeInfo[$tag][0];
1993            $count = $EXIFTypeInfo[$tag][1];
1994            $value = null;
1995
1996            if (($mode == 'ifd0') && ($tag == 0x8769)) {  // ExifIFDOffset
1997                if (isset($this->_info['exif']['EXIFVersion'])) {
1998                    $value =& $this->_getIFDEntries($isBigEndian, "exif");
1999                    $type = -99;
2000                }
2001                else {
2002                    $value = null;
2003                }
2004            } elseif (($mode == 'ifd0') && ($tag == 0x8825)) {  // GPSIFDOffset
2005                if (isset($this->_info['exif']['GPSVersionID'])) {
2006                    $value =& $this->_getIFDEntries($isBigEndian, "gps");
2007                    $type = -99;
2008                } else {
2009                    $value = null;
2010                }
2011            } elseif (($mode == 'ifd1') && ($tag == 0x0111)) {  // TIFFStripOffsets
2012                if (isset($this->_info['exif']['TIFFStrips'])) {
2013                    $value =& $this->_info['exif']['TIFFStrips'];
2014                    $type = -98;
2015                } else {
2016                    $value = null;
2017                }
2018            } elseif (($mode == 'ifd1') && ($tag == 0x0117)) {  // TIFFStripByteCounts
2019                if (isset($this->_info['exif']['TIFFStrips'])) {
2020                    $value = strlen($this->_info['exif']['TIFFStrips']);
2021                } else {
2022                    $value = null;
2023                }
2024            } elseif (($mode == 'ifd1') && ($tag == 0x0201)) {  // TIFFJFIFOffset
2025                if (isset($this->_info['exif']['JFIFThumbnail'])) {
2026                    $value =& $this->_info['exif']['JFIFThumbnail'];
2027                    $type = -98;
2028                } else {
2029                    $value = null;
2030                }
2031            } elseif (($mode == 'ifd1') && ($tag == 0x0202)) {  // TIFFJFIFLength
2032                if (isset($this->_info['exif']['JFIFThumbnail'])) {
2033                    $value = strlen($this->_info['exif']['JFIFThumbnail']);
2034                } else {
2035                    $value = null;
2036                }
2037            } elseif (($mode == 'exif') && ($tag == 0xA005)) {  // InteropIFDOffset
2038                if (isset($this->_info['exif']['InteroperabilityIndex'])) {
2039                    $value =& $this->_getIFDEntries($isBigEndian, "interop");
2040                    $type = -99;
2041                } else {
2042                    $value = null;
2043                }
2044            } elseif (isset($this->_info['exif'][$name])) {
2045                $origValue =& $this->_info['exif'][$name];
2046
2047                // This makes it easier to process variable size elements
2048                if (!is_array($origValue) || isset($origValue['val'])) {
2049                    unset($origValue); // Break the reference
2050                    $origValue = array($this->_info['exif'][$name]);
2051                }
2052                $origCount = count($origValue);
2053
2054                if ($origCount == 0 ) {
2055                    $type = -1;  // To ignore this field
2056                }
2057
2058                $value = " ";
2059
2060                switch ($type) {
2061                    case 1:    // UBYTE
2062                        if ($count == 0) {
2063                            $count = $origCount;
2064                        }
2065
2066                        $j = 0;
2067                        while (($j < $count) && ($j < $origCount)) {
2068
2069                            $this->_putByte($value, $j, $origValue[$j]);
2070                            $j++;
2071                        }
2072
2073                        while ($j < $count) {
2074                            $this->_putByte($value, $j, 0);
2075                            $j++;
2076                        }
2077                        break;
2078                    case 2:    // ASCII
2079                        $v = strval($origValue[0]);
2080                        if (($count != 0) && (strlen($v) > $count)) {
2081                            $v = substr($v, 0, $count);
2082                        }
2083                        elseif (($count > 0) && (strlen($v) < $count)) {
2084                            $v = str_pad($v, $count, "\0");
2085                        }
2086
2087                        $count = strlen($v);
2088
2089                        $this->_putString($value, 0, $v);
2090                        break;
2091                    case 3:    // USHORT
2092                        if ($count == 0) {
2093                            $count = $origCount;
2094                        }
2095
2096                        $j = 0;
2097                        while (($j < $count) && ($j < $origCount)) {
2098                            $this->_putShort($value, $j * 2, $origValue[$j], $isBigEndian);
2099                            $j++;
2100                        }
2101
2102                        while ($j < $count) {
2103                            $this->_putShort($value, $j * 2, 0, $isBigEndian);
2104                            $j++;
2105                        }
2106                        break;
2107                    case 4:    // ULONG
2108                        if ($count == 0) {
2109                            $count = $origCount;
2110                        }
2111
2112                        $j = 0;
2113                        while (($j < $count) && ($j < $origCount)) {
2114                            $this->_putLong($value, $j * 4, $origValue[$j], $isBigEndian);
2115                            $j++;
2116                        }
2117
2118                        while ($j < $count) {
2119                            $this->_putLong($value, $j * 4, 0, $isBigEndian);
2120                            $j++;
2121                        }
2122                        break;
2123                    case 5:    // URATIONAL
2124                        if ($count == 0) {
2125                            $count = $origCount;
2126                        }
2127
2128                        $j = 0;
2129                        while (($j < $count) && ($j < $origCount)) {
2130                            $v = $origValue[$j];
2131                            if (is_array($v)) {
2132                                $a = $v['num'];
2133                                $b = $v['den'];
2134                            }
2135                            else {
2136                                $a = 0;
2137                                $b = 0;
2138                                // TODO: Allow other types and convert them
2139                            }
2140                            $this->_putLong($value, $j * 8, $a, $isBigEndian);
2141                            $this->_putLong($value, ($j * 8) + 4, $b, $isBigEndian);
2142                            $j++;
2143                        }
2144
2145                        while ($j < $count) {
2146                            $this->_putLong($value, $j * 8, 0, $isBigEndian);
2147                            $this->_putLong($value, ($j * 8) + 4, 0, $isBigEndian);
2148                            $j++;
2149                        }
2150                        break;
2151                    case 6:    // SBYTE
2152                        if ($count == 0) {
2153                            $count = $origCount;
2154                        }
2155
2156                        $j = 0;
2157                        while (($j < $count) && ($j < $origCount)) {
2158                            $this->_putByte($value, $j, $origValue[$j]);
2159                            $j++;
2160                        }
2161
2162                        while ($j < $count) {
2163                            $this->_putByte($value, $j, 0);
2164                            $j++;
2165                        }
2166                        break;
2167                    case 7:    // UNDEFINED
2168                        $v = strval($origValue[0]);
2169                        if (($count != 0) && (strlen($v) > $count)) {
2170                            $v = substr($v, 0, $count);
2171                        }
2172                        elseif (($count > 0) && (strlen($v) < $count)) {
2173                            $v = str_pad($v, $count, "\0");
2174                        }
2175
2176                        $count = strlen($v);
2177
2178                        $this->_putString($value, 0, $v);
2179                        break;
2180                    case 8:    // SSHORT
2181                        if ($count == 0) {
2182                            $count = $origCount;
2183                        }
2184
2185                        $j = 0;
2186                        while (($j < $count) && ($j < $origCount)) {
2187                            $this->_putShort($value, $j * 2, $origValue[$j], $isBigEndian);
2188                            $j++;
2189                        }
2190
2191                        while ($j < $count) {
2192                            $this->_putShort($value, $j * 2, 0, $isBigEndian);
2193                            $j++;
2194                        }
2195                        break;
2196                    case 9:    // SLONG
2197                        if ($count == 0) {
2198                            $count = $origCount;
2199                        }
2200
2201                        $j = 0;
2202                        while (($j < $count) && ($j < $origCount)) {
2203                            $this->_putLong($value, $j * 4, $origValue[$j], $isBigEndian);
2204                            $j++;
2205                        }
2206
2207                        while ($j < $count) {
2208                            $this->_putLong($value, $j * 4, 0, $isBigEndian);
2209                            $j++;
2210                        }
2211                        break;
2212                    case 10:   // SRATIONAL
2213                        if ($count == 0) {
2214                            $count = $origCount;
2215                        }
2216
2217                        $j = 0;
2218                        while (($j < $count) && ($j < $origCount)) {
2219                            $v = $origValue[$j];
2220                            if (is_array($v)) {
2221                                $a = $v['num'];
2222                                $b = $v['den'];
2223                            }
2224                            else {
2225                                $a = 0;
2226                                $b = 0;
2227                                // TODO: Allow other types and convert them
2228                            }
2229
2230                            $this->_putLong($value, $j * 8, $a, $isBigEndian);
2231                            $this->_putLong($value, ($j * 8) + 4, $b, $isBigEndian);
2232                            $j++;
2233                        }
2234
2235                        while ($j < $count) {
2236                            $this->_putLong($value, $j * 8, 0, $isBigEndian);
2237                            $this->_putLong($value, ($j * 8) + 4, 0, $isBigEndian);
2238                            $j++;
2239                        }
2240                        break;
2241                    case 11:   // FLOAT
2242                        if ($count == 0) {
2243                            $count = $origCount;
2244                        }
2245
2246                        $j = 0;
2247                        while (($j < $count) && ($j < $origCount)) {
2248                            $v = strval($origValue[$j]);
2249                            if (strlen($v) > 4) {
2250                                $v = substr($v, 0, 4);
2251                            }
2252                            elseif (strlen($v) < 4) {
2253                                $v = str_pad($v, 4, "\0");
2254                            }
2255                            $this->_putString($value, $j * 4, $v);
2256                            $j++;
2257                        }
2258
2259                        while ($j < $count) {
2260                            $v = "\0\0\0\0";
2261                            $this->_putString($value, $j * 4, $v);
2262                            $j++;
2263                        }
2264                        break;
2265                    case 12:   // DFLOAT
2266                        if ($count == 0) {
2267                            $count = $origCount;
2268                        }
2269
2270                        $j = 0;
2271                        while (($j < $count) && ($j < $origCount)) {
2272                            $v = strval($origValue[$j]);
2273                            if (strlen($v) > 8) {
2274                                $v = substr($v, 0, 8);
2275                            }
2276                            elseif (strlen($v) < 8) {
2277                                $v = str_pad($v, 8, "\0");
2278                            }
2279                            $this->_putString($value, $j * 8, $v);
2280                            $j++;
2281                        }
2282
2283                        while ($j < $count) {
2284                            $v = "\0\0\0\0\0\0\0\0";
2285                            $this->_putString($value, $j * 8, $v);
2286                            $j++;
2287                        }
2288                        break;
2289                    default:
2290                        $value = null;
2291                        break;
2292                }
2293            }
2294
2295            if ($value != null) {
2296                $ifdEntries[$entryCount] = array();
2297                $ifdEntries[$entryCount]['tag'] = $tag;
2298                $ifdEntries[$entryCount]['type'] = $type;
2299                $ifdEntries[$entryCount]['count'] = $count;
2300                $ifdEntries[$entryCount]['value'] = $value;
2301
2302                $entryCount++;
2303            }
2304        }
2305
2306        return $ifdEntries;
2307    }
2308
2309    /*************************************************************/
2310    function _parseMarkerAdobe() {
2311        if (!isset($this->_markers)) {
2312            $this->_readJPEG();
2313        }
2314
2315        if ($this->_markers == null) {
2316            return false;
2317        }
2318
2319        $data = null;
2320        $count = count($this->_markers);
2321        for ($i = 0; $i < $count; $i++) {
2322            if ($this->_markers[$i]['marker'] == 0xED) {
2323                $signature = $this->_getFixedString($this->_markers[$i]['data'], 0, 14);
2324                if ($signature == "Photoshop 3.0\0") {
2325                    $data =& $this->_markers[$i]['data'];
2326                    break;
2327                }
2328            }
2329        }
2330
2331        if ($data == null) {
2332            $this->_info['adobe'] = false;
2333            $this->_info['iptc'] = false;
2334            return false;
2335        }
2336        $pos = 14;
2337        $this->_info['adobe'] = array();
2338        $this->_info['adobe']['raw'] = array();
2339        $this->_info['iptc'] = array();
2340
2341        $datasize = strlen($data);
2342
2343        while ($pos < $datasize) {
2344            $signature = $this->_getFixedString($data, $pos, 4);
2345            if ($signature != '8BIM')
2346                return false;
2347            $pos += 4;
2348
2349            $type = $this->_getShort($data, $pos);
2350            $pos += 2;
2351
2352            $strlen = $this->_getByte($data, $pos);
2353            $pos += 1;
2354            $header = '';
2355            for ($i = 0; $i < $strlen; $i++) {
2356                $header .= $data{$pos + $i};
2357            }
2358            $pos += $strlen + 1 - ($strlen % 2);  // The string is padded to even length, counting the length byte itself
2359
2360            $length = $this->_getLong($data, $pos);
2361            $pos += 4;
2362
2363            $basePos = $pos;
2364
2365            switch ($type) {
2366                case 0x0404: // Caption (IPTC Data)
2367                    $pos = $this->_readIPTC($data, $pos);
2368                    if ($pos == false)
2369                        return false;
2370                    break;
2371                case 0x040A: // CopyrightFlag
2372                    $this->_info['adobe']['CopyrightFlag'] = $this->_getByte($data, $pos);
2373                    $pos += $length;
2374                    break;
2375                case 0x040B: // ImageURL
2376                    $this->_info['adobe']['ImageURL'] = $this->_getFixedString($data, $pos, $length);
2377                    $pos += $length;
2378                    break;
2379                case 0x040C: // Thumbnail
2380                    $aux = $this->_getLong($data, $pos);
2381                    $pos += 4;
2382                    if ($aux == 1) {
2383                        $this->_info['adobe']['ThumbnailWidth'] = $this->_getLong($data, $pos);
2384                        $pos += 4;
2385                        $this->_info['adobe']['ThumbnailHeight'] = $this->_getLong($data, $pos);
2386                        $pos += 4;
2387
2388                        $pos += 16; // Skip some data
2389
2390                        $this->_info['adobe']['ThumbnailData'] = $this->_getFixedString($data, $pos, $length - 28);
2391                        $pos += $length - 28;
2392                    }
2393                    break;
2394                default:
2395                    break;
2396            }
2397
2398            // We save all blocks, even those we recognized
2399            $label = sprintf('8BIM_0x%04x', $type);
2400            $this->_info['adobe']['raw'][$label] = array();
2401            $this->_info['adobe']['raw'][$label]['type'] = $type;
2402            $this->_info['adobe']['raw'][$label]['header'] = $header;
2403            $this->_info['adobe']['raw'][$label]['data'] =& $this->_getFixedString($data, $basePos, $length);
2404
2405            $pos = $basePos + $length + ($length % 2); // Even padding
2406        }
2407
2408    }
2409
2410    /*************************************************************/
2411    function _readIPTC(&$data, $pos = 0) {
2412        $totalLength = strlen($data);
2413
2414        $IPTCTags = $this->_iptcTagNames();
2415
2416        while ($pos < ($totalLength - 5)) {
2417            $signature = $this->_getShort($data, $pos);
2418            if ($signature != 0x1C02)
2419                return $pos;
2420            $pos += 2;
2421
2422            $type = $this->_getByte($data, $pos);
2423            $pos += 1;
2424            $length = $this->_getShort($data, $pos);
2425            $pos += 2;
2426
2427            $basePos = $pos;
2428            $label = '';
2429
2430            if (isset($IPTCTags[$type])) {
2431                $label = $IPTCTags[$type];
2432            } else {
2433                $label = sprintf('IPTC_0x%02x', $type);
2434            }
2435
2436            if ($label != '') {
2437                if (isset($this->_info['iptc'][$label])) {
2438                    if (!is_array($this->_info['iptc'][$label])) {
2439                        $aux = array();
2440                        $aux[0] = $this->_info['iptc'][$label];
2441                        $this->_info['iptc'][$label] = $aux;
2442                    }
2443                    $this->_info['iptc'][$label][ count($this->_info['iptc'][$label]) ] = $this->_getFixedString($data, $pos, $length);
2444                } else {
2445                    $this->_info['iptc'][$label] = $this->_getFixedString($data, $pos, $length);
2446                }
2447            }
2448
2449            $pos = $basePos + $length; // No padding
2450        }
2451        return $pos;
2452    }
2453
2454    /*************************************************************/
2455    function & _createMarkerAdobe() {
2456        if (isset($this->_info['iptc'])) {
2457            if (!isset($this->_info['adobe'])) {
2458                $this->_info['adobe'] = array();
2459            }
2460            if (!isset($this->_info['adobe']['raw'])) {
2461                $this->_info['adobe']['raw'] = array();
2462            }
2463            if (!isset($this->_info['adobe']['raw']['8BIM_0x0404'])) {
2464                $this->_info['adobe']['raw']['8BIM_0x0404'] = array();
2465            }
2466            $this->_info['adobe']['raw']['8BIM_0x0404']['type'] = 0x0404;
2467            $this->_info['adobe']['raw']['8BIM_0x0404']['header'] = "Caption";
2468            $this->_info['adobe']['raw']['8BIM_0x0404']['data'] =& $this->_writeIPTC();
2469        }
2470
2471        if (isset($this->_info['adobe']['raw']) && (count($this->_info['adobe']['raw']) > 0)) {
2472            $data = "Photoshop 3.0\0";
2473            $pos = 14;
2474
2475            reset($this->_info['adobe']['raw']);
2476            while (list($key) = each($this->_info['adobe']['raw'])) {
2477                $pos = $this->_write8BIM(
2478                        $data,
2479                        $pos,
2480                        $this->_info['adobe']['raw'][$key]['type'],
2481                        $this->_info['adobe']['raw'][$key]['header'],
2482                        $this->_info['adobe']['raw'][$key]['data'] );
2483            }
2484        }
2485
2486        return $data;
2487    }
2488
2489    /*************************************************************/
2490    function _write8BIM(&$data, $pos, $type, $header, &$value) {
2491        $signature = "8BIM";
2492
2493        $pos = $this->_putString($data, $pos, $signature);
2494        $pos = $this->_putShort($data, $pos, $type);
2495
2496        $len = strlen($header);
2497
2498        $pos = $this->_putByte($data, $pos, $len);
2499        $pos = $this->_putString($data, $pos, $header);
2500        if (($len % 2) == 0) {  // Even padding, including the length byte
2501            $pos = $this->_putByte($data, $pos, 0);
2502        }
2503
2504        $len = strlen($value);
2505        $pos = $this->_putLong($data, $pos, $len);
2506        $pos = $this->_putString($data, $pos, $value);
2507        if (($len % 2) != 0) {  // Even padding
2508            $pos = $this->_putByte($data, $pos, 0);
2509        }
2510        return $pos;
2511    }
2512
2513    /*************************************************************/
2514    function & _writeIPTC() {
2515        $data = " ";
2516        $pos = 0;
2517
2518        $IPTCNames =& $this->_iptcNameTags();
2519
2520        reset($this->_info['iptc']);
2521
2522        while (list($label) = each($this->_info['iptc'])) {
2523            $value =& $this->_info['iptc'][$label];
2524            $type = -1;
2525
2526            if (isset($IPTCNames[$label])) {
2527                $type = $IPTCNames[$label];
2528            }
2529            elseif (substr($label, 0, 7) == "IPTC_0x") {
2530                $type = hexdec(substr($label, 7, 2));
2531            }
2532
2533            if ($type != -1) {
2534                if (is_array($value)) {
2535                    $vcnt = count($value);
2536                    for ($i = 0; $i < $vcnt; $i++) {
2537                        $pos = $this->_writeIPTCEntry($data, $pos, $type, $value[$i]);
2538                    }
2539                }
2540                else {
2541                    $pos = $this->_writeIPTCEntry($data, $pos, $type, $value);
2542                }
2543            }
2544        }
2545
2546        return $data;
2547    }
2548
2549    /*************************************************************/
2550    function _writeIPTCEntry(&$data, $pos, $type, &$value) {
2551        $pos = $this->_putShort($data, $pos, 0x1C02);
2552        $pos = $this->_putByte($data, $pos, $type);
2553        $pos = $this->_putShort($data, $pos, strlen($value));
2554        $pos = $this->_putString($data, $pos, $value);
2555
2556        return $pos;
2557    }
2558
2559    /*************************************************************/
2560    function _exifTagNames($mode) {
2561        $tags = array();
2562
2563        if ($mode == 'ifd0') {
2564            $tags[0x010E] = 'ImageDescription';
2565            $tags[0x010F] = 'Make';
2566            $tags[0x0110] = 'Model';
2567            $tags[0x0112] = 'Orientation';
2568            $tags[0x011A] = 'XResolution';
2569            $tags[0x011B] = 'YResolution';
2570            $tags[0x0128] = 'ResolutionUnit';
2571            $tags[0x0131] = 'Software';
2572            $tags[0x0132] = 'DateTime';
2573            $tags[0x013B] = 'Artist';
2574            $tags[0x013E] = 'WhitePoint';
2575            $tags[0x013F] = 'PrimaryChromaticities';
2576            $tags[0x0211] = 'YCbCrCoefficients';
2577            $tags[0x0212] = 'YCbCrSubSampling';
2578            $tags[0x0213] = 'YCbCrPositioning';
2579            $tags[0x0214] = 'ReferenceBlackWhite';
2580            $tags[0x8298] = 'Copyright';
2581            $tags[0x8769] = 'ExifIFDOffset';
2582            $tags[0x8825] = 'GPSIFDOffset';
2583        }
2584        if ($mode == 'ifd1') {
2585            $tags[0x00FE] = 'TIFFNewSubfileType';
2586            $tags[0x00FF] = 'TIFFSubfileType';
2587            $tags[0x0100] = 'TIFFImageWidth';
2588            $tags[0x0101] = 'TIFFImageHeight';
2589            $tags[0x0102] = 'TIFFBitsPerSample';
2590            $tags[0x0103] = 'TIFFCompression';
2591            $tags[0x0106] = 'TIFFPhotometricInterpretation';
2592            $tags[0x0107] = 'TIFFThreshholding';
2593            $tags[0x0108] = 'TIFFCellWidth';
2594            $tags[0x0109] = 'TIFFCellLength';
2595            $tags[0x010A] = 'TIFFFillOrder';
2596            $tags[0x010E] = 'TIFFImageDescription';
2597            $tags[0x010F] = 'TIFFMake';
2598            $tags[0x0110] = 'TIFFModel';
2599            $tags[0x0111] = 'TIFFStripOffsets';
2600            $tags[0x0112] = 'TIFFOrientation';
2601            $tags[0x0115] = 'TIFFSamplesPerPixel';
2602            $tags[0x0116] = 'TIFFRowsPerStrip';
2603            $tags[0x0117] = 'TIFFStripByteCounts';
2604            $tags[0x0118] = 'TIFFMinSampleValue';
2605            $tags[0x0119] = 'TIFFMaxSampleValue';
2606            $tags[0x011A] = 'TIFFXResolution';
2607            $tags[0x011B] = 'TIFFYResolution';
2608            $tags[0x011C] = 'TIFFPlanarConfiguration';
2609            $tags[0x0122] = 'TIFFGrayResponseUnit';
2610            $tags[0x0123] = 'TIFFGrayResponseCurve';
2611            $tags[0x0128] = 'TIFFResolutionUnit';
2612            $tags[0x0131] = 'TIFFSoftware';
2613            $tags[0x0132] = 'TIFFDateTime';
2614            $tags[0x013B] = 'TIFFArtist';
2615            $tags[0x013C] = 'TIFFHostComputer';
2616            $tags[0x0140] = 'TIFFColorMap';
2617            $tags[0x0152] = 'TIFFExtraSamples';
2618            $tags[0x0201] = 'TIFFJFIFOffset';
2619            $tags[0x0202] = 'TIFFJFIFLength';
2620            $tags[0x0211] = 'TIFFYCbCrCoefficients';
2621            $tags[0x0212] = 'TIFFYCbCrSubSampling';
2622            $tags[0x0213] = 'TIFFYCbCrPositioning';
2623            $tags[0x0214] = 'TIFFReferenceBlackWhite';
2624            $tags[0x8298] = 'TIFFCopyright';
2625            $tags[0x9286] = 'TIFFUserComment';
2626        } elseif ($mode == 'exif') {
2627            $tags[0x829A] = 'ExposureTime';
2628            $tags[0x829D] = 'FNumber';
2629            $tags[0x8822] = 'ExposureProgram';
2630            $tags[0x8824] = 'SpectralSensitivity';
2631            $tags[0x8827] = 'ISOSpeedRatings';
2632            $tags[0x8828] = 'OECF';
2633            $tags[0x9000] = 'EXIFVersion';
2634            $tags[0x9003] = 'DatetimeOriginal';
2635            $tags[0x9004] = 'DatetimeDigitized';
2636            $tags[0x9101] = 'ComponentsConfiguration';
2637            $tags[0x9102] = 'CompressedBitsPerPixel';
2638            $tags[0x9201] = 'ShutterSpeedValue';
2639            $tags[0x9202] = 'ApertureValue';
2640            $tags[0x9203] = 'BrightnessValue';
2641            $tags[0x9204] = 'ExposureBiasValue';
2642            $tags[0x9205] = 'MaxApertureValue';
2643            $tags[0x9206] = 'SubjectDistance';
2644            $tags[0x9207] = 'MeteringMode';
2645            $tags[0x9208] = 'LightSource';
2646            $tags[0x9209] = 'Flash';
2647            $tags[0x920A] = 'FocalLength';
2648            $tags[0x927C] = 'MakerNote';
2649            $tags[0x9286] = 'UserComment';
2650            $tags[0x9290] = 'SubSecTime';
2651            $tags[0x9291] = 'SubSecTimeOriginal';
2652            $tags[0x9292] = 'SubSecTimeDigitized';
2653            $tags[0xA000] = 'FlashPixVersion';
2654            $tags[0xA001] = 'ColorSpace';
2655            $tags[0xA002] = 'PixelXDimension';
2656            $tags[0xA003] = 'PixelYDimension';
2657            $tags[0xA004] = 'RelatedSoundFile';
2658            $tags[0xA005] = 'InteropIFDOffset';
2659            $tags[0xA20B] = 'FlashEnergy';
2660            $tags[0xA20C] = 'SpatialFrequencyResponse';
2661            $tags[0xA20E] = 'FocalPlaneXResolution';
2662            $tags[0xA20F] = 'FocalPlaneYResolution';
2663            $tags[0xA210] = 'FocalPlaneResolutionUnit';
2664            $tags[0xA214] = 'SubjectLocation';
2665            $tags[0xA215] = 'ExposureIndex';
2666            $tags[0xA217] = 'SensingMethod';
2667            $tags[0xA300] = 'FileSource';
2668            $tags[0xA301] = 'SceneType';
2669            $tags[0xA302] = 'CFAPattern';
2670        } elseif ($mode == 'interop') {
2671            $tags[0x0001] = 'InteroperabilityIndex';
2672            $tags[0x0002] = 'InteroperabilityVersion';
2673            $tags[0x1000] = 'RelatedImageFileFormat';
2674            $tags[0x1001] = 'RelatedImageWidth';
2675            $tags[0x1002] = 'RelatedImageLength';
2676        } elseif ($mode == 'gps') {
2677            $tags[0x0000] = 'GPSVersionID';
2678            $tags[0x0001] = 'GPSLatitudeRef';
2679            $tags[0x0002] = 'GPSLatitude';
2680            $tags[0x0003] = 'GPSLongitudeRef';
2681            $tags[0x0004] = 'GPSLongitude';
2682            $tags[0x0005] = 'GPSAltitudeRef';
2683            $tags[0x0006] = 'GPSAltitude';
2684            $tags[0x0007] = 'GPSTimeStamp';
2685            $tags[0x0008] = 'GPSSatellites';
2686            $tags[0x0009] = 'GPSStatus';
2687            $tags[0x000A] = 'GPSMeasureMode';
2688            $tags[0x000B] = 'GPSDOP';
2689            $tags[0x000C] = 'GPSSpeedRef';
2690            $tags[0x000D] = 'GPSSpeed';
2691            $tags[0x000E] = 'GPSTrackRef';
2692            $tags[0x000F] = 'GPSTrack';
2693            $tags[0x0010] = 'GPSImgDirectionRef';
2694            $tags[0x0011] = 'GPSImgDirection';
2695            $tags[0x0012] = 'GPSMapDatum';
2696            $tags[0x0013] = 'GPSDestLatitudeRef';
2697            $tags[0x0014] = 'GPSDestLatitude';
2698            $tags[0x0015] = 'GPSDestLongitudeRef';
2699            $tags[0x0016] = 'GPSDestLongitude';
2700            $tags[0x0017] = 'GPSDestBearingRef';
2701            $tags[0x0018] = 'GPSDestBearing';
2702            $tags[0x0019] = 'GPSDestDistanceRef';
2703            $tags[0x001A] = 'GPSDestDistance';
2704        }
2705
2706        return $tags;
2707    }
2708
2709    /*************************************************************/
2710    function _exifTagTypes($mode) {
2711        $tags = array();
2712
2713        if ($mode == 'ifd0') {
2714            $tags[0x010E] = array(2, 0); // ImageDescription -> ASCII, Any
2715            $tags[0x010F] = array(2, 0); // Make -> ASCII, Any
2716            $tags[0x0110] = array(2, 0); // Model -> ASCII, Any
2717            $tags[0x0112] = array(3, 1); // Orientation -> SHORT, 1
2718            $tags[0x011A] = array(5, 1); // XResolution -> RATIONAL, 1
2719            $tags[0x011B] = array(5, 1); // YResolution -> RATIONAL, 1
2720            $tags[0x0128] = array(3, 1); // ResolutionUnit -> SHORT
2721            $tags[0x0131] = array(2, 0); // Software -> ASCII, Any
2722            $tags[0x0132] = array(2, 20); // DateTime -> ASCII, 20
2723            $tags[0x013B] = array(2, 0); // Artist -> ASCII, Any
2724            $tags[0x013E] = array(5, 2); // WhitePoint -> RATIONAL, 2
2725            $tags[0x013F] = array(5, 6); // PrimaryChromaticities -> RATIONAL, 6
2726            $tags[0x0211] = array(5, 3); // YCbCrCoefficients -> RATIONAL, 3
2727            $tags[0x0212] = array(3, 2); // YCbCrSubSampling -> SHORT, 2
2728            $tags[0x0213] = array(3, 1); // YCbCrPositioning -> SHORT, 1
2729            $tags[0x0214] = array(5, 6); // ReferenceBlackWhite -> RATIONAL, 6
2730            $tags[0x8298] = array(2, 0); // Copyright -> ASCII, Any
2731            $tags[0x8769] = array(4, 1); // ExifIFDOffset -> LONG, 1
2732            $tags[0x8825] = array(4, 1); // GPSIFDOffset -> LONG, 1
2733        }
2734        if ($mode == 'ifd1') {
2735            $tags[0x00FE] = array(4, 1); // TIFFNewSubfileType -> LONG, 1
2736            $tags[0x00FF] = array(3, 1); // TIFFSubfileType -> SHORT, 1
2737            $tags[0x0100] = array(4, 1); // TIFFImageWidth -> LONG (or SHORT), 1
2738            $tags[0x0101] = array(4, 1); // TIFFImageHeight -> LONG (or SHORT), 1
2739            $tags[0x0102] = array(3, 3); // TIFFBitsPerSample -> SHORT, 3
2740            $tags[0x0103] = array(3, 1); // TIFFCompression -> SHORT, 1
2741            $tags[0x0106] = array(3, 1); // TIFFPhotometricInterpretation -> SHORT, 1
2742            $tags[0x0107] = array(3, 1); // TIFFThreshholding -> SHORT, 1
2743            $tags[0x0108] = array(3, 1); // TIFFCellWidth -> SHORT, 1
2744            $tags[0x0109] = array(3, 1); // TIFFCellLength -> SHORT, 1
2745            $tags[0x010A] = array(3, 1); // TIFFFillOrder -> SHORT, 1
2746            $tags[0x010E] = array(2, 0); // TIFFImageDescription -> ASCII, Any
2747            $tags[0x010F] = array(2, 0); // TIFFMake -> ASCII, Any
2748            $tags[0x0110] = array(2, 0); // TIFFModel -> ASCII, Any
2749            $tags[0x0111] = array(4, 0); // TIFFStripOffsets -> LONG (or SHORT), Any (one per strip)
2750            $tags[0x0112] = array(3, 1); // TIFFOrientation -> SHORT, 1
2751            $tags[0x0115] = array(3, 1); // TIFFSamplesPerPixel -> SHORT, 1
2752            $tags[0x0116] = array(4, 1); // TIFFRowsPerStrip -> LONG (or SHORT), 1
2753            $tags[0x0117] = array(4, 0); // TIFFStripByteCounts -> LONG (or SHORT), Any (one per strip)
2754            $tags[0x0118] = array(3, 0); // TIFFMinSampleValue -> SHORT, Any (SamplesPerPixel)
2755            $tags[0x0119] = array(3, 0); // TIFFMaxSampleValue -> SHORT, Any (SamplesPerPixel)
2756            $tags[0x011A] = array(5, 1); // TIFFXResolution -> RATIONAL, 1
2757            $tags[0x011B] = array(5, 1); // TIFFYResolution -> RATIONAL, 1
2758            $tags[0x011C] = array(3, 1); // TIFFPlanarConfiguration -> SHORT, 1
2759            $tags[0x0122] = array(3, 1); // TIFFGrayResponseUnit -> SHORT, 1
2760            $tags[0x0123] = array(3, 0); // TIFFGrayResponseCurve -> SHORT, Any (2^BitsPerSample)
2761            $tags[0x0128] = array(3, 1); // TIFFResolutionUnit -> SHORT, 1
2762            $tags[0x0131] = array(2, 0); // TIFFSoftware -> ASCII, Any
2763            $tags[0x0132] = array(2, 20); // TIFFDateTime -> ASCII, 20
2764            $tags[0x013B] = array(2, 0); // TIFFArtist -> ASCII, Any
2765            $tags[0x013C] = array(2, 0); // TIFFHostComputer -> ASCII, Any
2766            $tags[0x0140] = array(3, 0); // TIFFColorMap -> SHORT, Any (3 * 2^BitsPerSample)
2767            $tags[0x0152] = array(3, 0); // TIFFExtraSamples -> SHORT, Any (SamplesPerPixel - 3)
2768            $tags[0x0201] = array(4, 1); // TIFFJFIFOffset -> LONG, 1
2769            $tags[0x0202] = array(4, 1); // TIFFJFIFLength -> LONG, 1
2770            $tags[0x0211] = array(5, 3); // TIFFYCbCrCoefficients -> RATIONAL, 3
2771            $tags[0x0212] = array(3, 2); // TIFFYCbCrSubSampling -> SHORT, 2
2772            $tags[0x0213] = array(3, 1); // TIFFYCbCrPositioning -> SHORT, 1
2773            $tags[0x0214] = array(5, 6); // TIFFReferenceBlackWhite -> RATIONAL, 6
2774            $tags[0x8298] = array(2, 0); // TIFFCopyright -> ASCII, Any
2775            $tags[0x9286] = array(2, 0); // TIFFUserComment -> ASCII, Any
2776        } elseif ($mode == 'exif') {
2777            $tags[0x829A] = array(5, 1); // ExposureTime -> RATIONAL, 1
2778            $tags[0x829D] = array(5, 1); // FNumber -> RATIONAL, 1
2779            $tags[0x8822] = array(3, 1); // ExposureProgram -> SHORT, 1
2780            $tags[0x8824] = array(2, 0); // SpectralSensitivity -> ASCII, Any
2781            $tags[0x8827] = array(3, 0); // ISOSpeedRatings -> SHORT, Any
2782            $tags[0x8828] = array(7, 0); // OECF -> UNDEFINED, Any
2783            $tags[0x9000] = array(7, 4); // EXIFVersion -> UNDEFINED, 4
2784            $tags[0x9003] = array(2, 20); // DatetimeOriginal -> ASCII, 20
2785            $tags[0x9004] = array(2, 20); // DatetimeDigitized -> ASCII, 20
2786            $tags[0x9101] = array(7, 4); // ComponentsConfiguration -> UNDEFINED, 4
2787            $tags[0x9102] = array(5, 1); // CompressedBitsPerPixel -> RATIONAL, 1
2788            $tags[0x9201] = array(10, 1); // ShutterSpeedValue -> SRATIONAL, 1
2789            $tags[0x9202] = array(5, 1); // ApertureValue -> RATIONAL, 1
2790            $tags[0x9203] = array(10, 1); // BrightnessValue -> SRATIONAL, 1
2791            $tags[0x9204] = array(10, 1); // ExposureBiasValue -> SRATIONAL, 1
2792            $tags[0x9205] = array(5, 1); // MaxApertureValue -> RATIONAL, 1
2793            $tags[0x9206] = array(5, 1); // SubjectDistance -> RATIONAL, 1
2794            $tags[0x9207] = array(3, 1); // MeteringMode -> SHORT, 1
2795            $tags[0x9208] = array(3, 1); // LightSource -> SHORT, 1
2796            $tags[0x9209] = array(3, 1); // Flash -> SHORT, 1
2797            $tags[0x920A] = array(5, 1); // FocalLength -> RATIONAL, 1
2798            $tags[0x927C] = array(7, 0); // MakerNote -> UNDEFINED, Any
2799            $tags[0x9286] = array(7, 0); // UserComment -> UNDEFINED, Any
2800            $tags[0x9290] = array(2, 0); // SubSecTime -> ASCII, Any
2801            $tags[0x9291] = array(2, 0); // SubSecTimeOriginal -> ASCII, Any
2802            $tags[0x9292] = array(2, 0); // SubSecTimeDigitized -> ASCII, Any
2803            $tags[0xA000] = array(7, 4); // FlashPixVersion -> UNDEFINED, 4
2804            $tags[0xA001] = array(3, 1); // ColorSpace -> SHORT, 1
2805            $tags[0xA002] = array(4, 1); // PixelXDimension -> LONG (or SHORT), 1
2806            $tags[0xA003] = array(4, 1); // PixelYDimension -> LONG (or SHORT), 1
2807            $tags[0xA004] = array(2, 13); // RelatedSoundFile -> ASCII, 13
2808            $tags[0xA005] = array(4, 1); // InteropIFDOffset -> LONG, 1
2809            $tags[0xA20B] = array(5, 1); // FlashEnergy -> RATIONAL, 1
2810            $tags[0xA20C] = array(7, 0); // SpatialFrequencyResponse -> UNDEFINED, Any
2811            $tags[0xA20E] = array(5, 1); // FocalPlaneXResolution -> RATIONAL, 1
2812            $tags[0xA20F] = array(5, 1); // FocalPlaneYResolution -> RATIONAL, 1
2813            $tags[0xA210] = array(3, 1); // FocalPlaneResolutionUnit -> SHORT, 1
2814            $tags[0xA214] = array(3, 2); // SubjectLocation -> SHORT, 2
2815            $tags[0xA215] = array(5, 1); // ExposureIndex -> RATIONAL, 1
2816            $tags[0xA217] = array(3, 1); // SensingMethod -> SHORT, 1
2817            $tags[0xA300] = array(7, 1); // FileSource -> UNDEFINED, 1
2818            $tags[0xA301] = array(7, 1); // SceneType -> UNDEFINED, 1
2819            $tags[0xA302] = array(7, 0); // CFAPattern -> UNDEFINED, Any
2820        } elseif ($mode == 'interop') {
2821            $tags[0x0001] = array(2, 0); // InteroperabilityIndex -> ASCII, Any
2822            $tags[0x0002] = array(7, 4); // InteroperabilityVersion -> UNKNOWN, 4
2823            $tags[0x1000] = array(2, 0); // RelatedImageFileFormat -> ASCII, Any
2824            $tags[0x1001] = array(4, 1); // RelatedImageWidth -> LONG (or SHORT), 1
2825            $tags[0x1002] = array(4, 1); // RelatedImageLength -> LONG (or SHORT), 1
2826        } elseif ($mode == 'gps') {
2827            $tags[0x0000] = array(1, 4); // GPSVersionID -> BYTE, 4
2828            $tags[0x0001] = array(2, 2); // GPSLatitudeRef -> ASCII, 2
2829            $tags[0x0002] = array(5, 3); // GPSLatitude -> RATIONAL, 3
2830            $tags[0x0003] = array(2, 2); // GPSLongitudeRef -> ASCII, 2
2831            $tags[0x0004] = array(5, 3); // GPSLongitude -> RATIONAL, 3
2832            $tags[0x0005] = array(2, 2); // GPSAltitudeRef -> ASCII, 2
2833            $tags[0x0006] = array(5, 1); // GPSAltitude -> RATIONAL, 1
2834            $tags[0x0007] = array(5, 3); // GPSTimeStamp -> RATIONAL, 3
2835            $tags[0x0008] = array(2, 0); // GPSSatellites -> ASCII, Any
2836            $tags[0x0009] = array(2, 2); // GPSStatus -> ASCII, 2
2837            $tags[0x000A] = array(2, 2); // GPSMeasureMode -> ASCII, 2
2838            $tags[0x000B] = array(5, 1); // GPSDOP -> RATIONAL, 1
2839            $tags[0x000C] = array(2, 2); // GPSSpeedRef -> ASCII, 2
2840            $tags[0x000D] = array(5, 1); // GPSSpeed -> RATIONAL, 1
2841            $tags[0x000E] = array(2, 2); // GPSTrackRef -> ASCII, 2
2842            $tags[0x000F] = array(5, 1); // GPSTrack -> RATIONAL, 1
2843            $tags[0x0010] = array(2, 2); // GPSImgDirectionRef -> ASCII, 2
2844            $tags[0x0011] = array(5, 1); // GPSImgDirection -> RATIONAL, 1
2845            $tags[0x0012] = array(2, 0); // GPSMapDatum -> ASCII, Any
2846            $tags[0x0013] = array(2, 2); // GPSDestLatitudeRef -> ASCII, 2
2847            $tags[0x0014] = array(5, 3); // GPSDestLatitude -> RATIONAL, 3
2848            $tags[0x0015] = array(2, 2); // GPSDestLongitudeRef -> ASCII, 2
2849            $tags[0x0016] = array(5, 3); // GPSDestLongitude -> RATIONAL, 3
2850            $tags[0x0017] = array(2, 2); // GPSDestBearingRef -> ASCII, 2
2851            $tags[0x0018] = array(5, 1); // GPSDestBearing -> RATIONAL, 1
2852            $tags[0x0019] = array(2, 2); // GPSDestDistanceRef -> ASCII, 2
2853            $tags[0x001A] = array(5, 1); // GPSDestDistance -> RATIONAL, 1
2854        }
2855
2856        return $tags;
2857    }
2858
2859    /*************************************************************/
2860    function _exifNameTags($mode) {
2861        $tags = $this->_exifTagNames($mode);
2862        return $this->_names2Tags($tags);
2863    }
2864
2865    /*************************************************************/
2866    function _iptcTagNames() {
2867        $tags = array();
2868        $tags[0x14] = 'SuplementalCategories';
2869        $tags[0x19] = 'Keywords';
2870        $tags[0x78] = 'Caption';
2871        $tags[0x7A] = 'CaptionWriter';
2872        $tags[0x69] = 'Headline';
2873        $tags[0x28] = 'SpecialInstructions';
2874        $tags[0x0F] = 'Category';
2875        $tags[0x50] = 'Byline';
2876        $tags[0x55] = 'BylineTitle';
2877        $tags[0x6E] = 'Credit';
2878        $tags[0x73] = 'Source';
2879        $tags[0x74] = 'CopyrightNotice';
2880        $tags[0x05] = 'ObjectName';
2881        $tags[0x5A] = 'City';
2882        $tags[0x5C] = 'Sublocation';
2883        $tags[0x5F] = 'ProvinceState';
2884        $tags[0x65] = 'CountryName';
2885        $tags[0x67] = 'OriginalTransmissionReference';
2886        $tags[0x37] = 'DateCreated';
2887        $tags[0x0A] = 'CopyrightFlag';
2888
2889        return $tags;
2890    }
2891
2892    /*************************************************************/
2893    function & _iptcNameTags() {
2894        $tags = $this->_iptcTagNames();
2895        return $this->_names2Tags($tags);
2896    }
2897
2898    /*************************************************************/
2899    function _names2Tags($tags2Names) {
2900        $names2Tags = array();
2901        reset($tags2Names);
2902        while (list($tag, $name) = each($tags2Names)) {
2903            $names2Tags[$name] = $tag;
2904        }
2905
2906        return $names2Tags;
2907    }
2908
2909    /*************************************************************/
2910    function _getByte(&$data, $pos) {
2911        return ord($data{$pos});
2912    }
2913
2914    /*************************************************************/
2915    function _putByte(&$data, $pos, $val) {
2916        $val = intval($val);
2917
2918        $data{$pos} = chr($val);
2919
2920        return $pos + 1;
2921    }
2922
2923    /*************************************************************/
2924    function _getShort(&$data, $pos, $bigEndian = true) {
2925        if ($bigEndian) {
2926            return (ord($data{$pos}) << 8)
2927                + ord($data{$pos + 1});
2928        } else {
2929            return ord($data{$pos})
2930                + (ord($data{$pos + 1}) << 8);
2931        }
2932    }
2933
2934    /*************************************************************/
2935    function _putShort(&$data, $pos = 0, $val = 0, $bigEndian = true) {
2936        $val = intval($val);
2937
2938        if ($bigEndian) {
2939            $data{$pos + 0} = chr(($val & 0x0000FF00) >> 8);
2940            $data{$pos + 1} = chr(($val & 0x000000FF) >> 0);
2941        } else {
2942            $data{$pos + 0} = chr(($val & 0x00FF) >> 0);
2943            $data{$pos + 1} = chr(($val & 0xFF00) >> 8);
2944        }
2945
2946        return $pos + 2;
2947    }
2948
2949    /*************************************************************/
2950    function _getLong(&$data, $pos, $bigEndian = true) {
2951        if ($bigEndian) {
2952            return (ord($data{$pos}) << 24)
2953                + (ord($data{$pos + 1}) << 16)
2954                + (ord($data{$pos + 2}) << 8)
2955                + ord($data{$pos + 3});
2956        } else {
2957            return ord($data{$pos})
2958                + (ord($data{$pos + 1}) << 8)
2959                + (ord($data{$pos + 2}) << 16)
2960                + (ord($data{$pos + 3}) << 24);
2961        }
2962    }
2963
2964    /*************************************************************/
2965    function _putLong(&$data, $pos, $val, $bigEndian = true) {
2966        $val = intval($val);
2967
2968        if ($bigEndian) {
2969            $data{$pos + 0} = chr(($val & 0xFF000000) >> 24);
2970            $data{$pos + 1} = chr(($val & 0x00FF0000) >> 16);
2971            $data{$pos + 2} = chr(($val & 0x0000FF00) >> 8);
2972            $data{$pos + 3} = chr(($val & 0x000000FF) >> 0);
2973        } else {
2974            $data{$pos + 0} = chr(($val & 0x000000FF) >> 0);
2975            $data{$pos + 1} = chr(($val & 0x0000FF00) >> 8);
2976            $data{$pos + 2} = chr(($val & 0x00FF0000) >> 16);
2977            $data{$pos + 3} = chr(($val & 0xFF000000) >> 24);
2978        }
2979
2980        return $pos + 4;
2981    }
2982
2983    /*************************************************************/
2984    function & _getNullString(&$data, $pos) {
2985        $str = '';
2986        $max = strlen($data);
2987
2988        while ($pos < $max) {
2989            if (ord($data{$pos}) == 0) {
2990                return $str;
2991            } else {
2992                $str .= $data{$pos};
2993            }
2994            $pos++;
2995        }
2996
2997        return $str;
2998    }
2999
3000    /*************************************************************/
3001    function & _getFixedString(&$data, $pos, $length = -1) {
3002        if ($length == -1) {
3003            $length = strlen($data) - $pos;
3004        }
3005
3006        $rv = substr($data, $pos, $length);
3007        return $rv;
3008    }
3009
3010    /*************************************************************/
3011    function _putString(&$data, $pos, &$str) {
3012        $len = strlen($str);
3013        for ($i = 0; $i < $len; $i++) {
3014            $data{$pos + $i} = $str{$i};
3015        }
3016
3017        return $pos + $len;
3018    }
3019
3020    /*************************************************************/
3021    function _hexDump(&$data, $start = 0, $length = -1) {
3022        if (($length == -1) || (($length + $start) > strlen($data))) {
3023            $end = strlen($data);
3024        } else {
3025            $end = $start + $length;
3026        }
3027
3028        $ascii = '';
3029        $count = 0;
3030
3031        echo "<tt>\n";
3032
3033        while ($start < $end) {
3034            if (($count % 16) == 0) {
3035                echo sprintf('%04d', $count) . ': ';
3036            }
3037
3038            $c = ord($data{$start});
3039            $count++;
3040            $start++;
3041
3042            $aux = dechex($c);
3043            if (strlen($aux) == 1)
3044                echo '0';
3045            echo $aux . ' ';
3046
3047            if ($c == 60)
3048                $ascii .= '&lt;';
3049            elseif ($c == 62)
3050                $ascii .= '&gt;';
3051            elseif ($c == 32)
3052                $ascii .= '&#160;';
3053            elseif ($c > 32)
3054                $ascii .= chr($c);
3055            else
3056                $ascii .= '.';
3057
3058            if (($count % 4) == 0) {
3059                echo ' - ';
3060            }
3061
3062            if (($count % 16) == 0) {
3063                echo ': ' . $ascii . "<br>\n";
3064                $ascii = '';
3065            }
3066        }
3067
3068        if ($ascii != '') {
3069            while (($count % 16) != 0) {
3070                echo '-- ';
3071                $count++;
3072                if (($count % 4) == 0) {
3073                    echo ' - ';
3074                }
3075            }
3076            echo ': ' . $ascii . "<br>\n";
3077        }
3078
3079        echo "</tt>\n";
3080    }
3081
3082    /*****************************************************************/
3083}
3084
3085/* vim: set expandtab tabstop=4 shiftwidth=4: */
3086