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source: extensions/AMetaData/JpegMetaData/Readers/AppMarkerSegmentReader.class.php @ 4686

Last change on this file since 4686 was 4686, checked in by grum, 15 years ago
[Plugin:AMetaData] prepare the directory for a future plugin
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1	<?php
2	/*
3	* --:: JPEG MetaDatas ::-------------------------------------------------------
4	*
5	* Author : Grum
6	* email : grum at piwigo.org
7	* website : http://photos.grum.fr
8	*
9	* << May the Little SpaceFrog be with you ! >>
10	*
11	* +-----------------------------------------------------------------------+
12	* \| JpegMetaData - a PHP based Jpeg Metadata manager \|
13	* +-----------------------------------------------------------------------+
14	* \| Copyright(C) 2010 Grum - http://www.grum.fr \|
15	* +-----------------------------------------------------------------------+
16	* \| This program is free software; you can redistribute it and/or modify \|
17	* \| it under the terms of the GNU General Public License as published by \|
18	* \| the Free Software Foundation \|
19	* \| \|
20	* \| This program is distributed in the hope that it will be useful, but \|
21	* \| WITHOUT ANY WARRANTY; without even the implied warranty of \|
22	* \| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU \|
23	* \| General Public License for more details. \|
24	* \| \|
25	* \| You should have received a copy of the GNU General Public License \|
26	* \| along with this program; if not, write to the Free Software \|
27	* \| Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, \|
28	* \| USA. \|
29	* +-----------------------------------------------------------------------+
30	*
31	*
32	* -----------------------------------------------------------------------------
33	*
34	* The AppMarkerSegmentReader is a class for reading the segment of a Jpeg file
35	*
36	* -----------------------------------------------------------------------------
37	*
38	* .. Notes ..
39	*
40	* The class can recognize many kind of segments, but the content is not
41	* analyzed for all of them.
42	*
43	* If you want to implement new functionnality to read segment, you must start
44	* here.
45	*
46	* Datas are exploited only for the segments :
47	* - APP1 : for Exif IFDs & Xmp datas
48	* - APP13 : for 8BIM Iptc blocks
49	* - COM : comments block
50	*
51	*
52	* This class provides theses public functions :
53	* - (static) read
54	* - (static) isValidMarkerHeader
55	* - (static) markerName
56	* - getHeader
57	* - getOffset
58	* - getLength
59	* - getSubType
60	* - dataLoaded
61	* - getData
62	*
63	* Read the code for help
64	*
65	* -----------------------------------------------------------------------------
66	*
67	*/
68
69	require_once(JPEG_METADATA_DIR."Common/ConvertData.class.php");
70	require_once(JPEG_METADATA_DIR."Common/Data.class.php");
71
72	require_once(JPEG_METADATA_DIR."Readers/TiffReader.class.php");
73	require_once(JPEG_METADATA_DIR."Readers/XmpReader.class.php");
74	require_once(JPEG_METADATA_DIR."Readers/IptcReader.class.php");
75
76	class AppMarkerSegmentReader
77	{
78	const SEGMENT_HEAD = 0xFF;
79	const SEGMENT_APP0 = 0xE0;
80	const SEGMENT_APP1 = 0xE1;
81	const SEGMENT_APP2 = 0xE2;
82	const SEGMENT_APP3 = 0xE3;
83	const SEGMENT_APP4 = 0xE4;
84	const SEGMENT_APP5 = 0xE5;
85	const SEGMENT_APP6 = 0xE6;
86	const SEGMENT_APP7 = 0xE7;
87	const SEGMENT_APP8 = 0xE8;
88	const SEGMENT_APP9 = 0xE9;
89	const SEGMENT_APP10 = 0xEA;
90	const SEGMENT_APP11 = 0xEB;
91	const SEGMENT_APP12 = 0xEC;
92	const SEGMENT_APP13 = 0xED;
93	const SEGMENT_APP14 = 0xEE;
94	const SEGMENT_APP15 = 0xEF;
95
96	const SEGMENT_SOF0 = 0xC0; // Start Of Frame - Baseline DCT (huffman)
97	const SEGMENT_SOF1 = 0xC1; // Start Of Frame - Extended sequential DCT (huffman)
98	const SEGMENT_SOF2 = 0xC2; // Start Of Frame - Progressive DCT (huffman)
99	const SEGMENT_SOF3 = 0xC3; // Start Of Frame - Spatial (Lossless) DCT (Huffman)
100	const SEGMENT_SOF5 = 0xC5; // Start Of Frame - Differential sequential DCT (Huffman)
101	const SEGMENT_SOF6 = 0xC6; // Start Of Frame - Progressive sequential DCT (Huffman)
102	const SEGMENT_SOF7 = 0xC7; // Start Of Frame - Differential spatial DCT (Huffman)
103	const SEGMENT_SOF9 = 0xC9; // Start Of Frame - Extended sequential DCT (arithmetic)
104	const SEGMENT_SOFA = 0xCA; // Start Of Frame - Progressive DCT (arithmetic)
105	const SEGMENT_SOFB = 0xCB; // Start Of Frame - Spatial (lossless) DCT (arithmetic)
106	const SEGMENT_SOFD = 0xCD; // Start Of Frame - Differential sequential DCT (arithmetic)
107	const SEGMENT_SOFE = 0xCE; // Start Of Frame - Differential progressive DCT (arithmetic)
108	const SEGMENT_SOFF = 0xCF; // Start Of Frame - Differential lossless (arithmetic)
109
110	const SEGMENT_DQT = 0xDB; // Define Quantization Table
111	const SEGMENT_DHT = 0xC4; // Define Huffman Tables
112	const SEGMENT_JPG = 0xC8; // Reserved for JPEG extensions
113	const SEGMENT_DAC = 0xCC; // Arithmetic Conditionning info
114	const SEGMENT_SOS = 0xDA; // Start Of Scan
115	const SEGMENT_DRI = 0xDD; // Define Restart Interval
116	const SEGMENT_COM = 0xFE; // Comment
117
118
119
120	const UNKNOWN = "?";
121
122	/*
123	* APP0 SubTypes
124	*/
125	const APP0_JFIF = "JFIF";
126	const APP0_JFXX = "JFXX";
127	const APP0_CIFF = "CIFF";
128	const APP0_AVI1 = "AVI1";
129
130	/*
131	* APP1 SubTypes
132	*/
133	const APP1_EXIF = "EXIF";
134	const APP1_XMP = "XMP";
135	const APP1_EXTENDEDXMP = "ExtendedXMP";
136
137	/*
138	* APP2 SubTypes
139	*/
140	const APP2_ICCPROFILE = "ICC Profile";
141	const APP2_FPXR = "FlashPix";
142	const APP2_MPF = "MPF";
143	const APP2_SAMSUNGLP = "Samsung large preview";
144
145	/*
146	* APP3 SubTypes
147	*/
148	const APP3_META = "Meta";
149	const APP3_STIM = "Stim";
150
151	/*
152	* APP4 SubTypes
153	*/
154	const APP4_SCALADO = "Scalado";
155
156	/*
157	* APP5 SubTypes
158	*/
159	const APP5_RMETA = "Ricoh Meta";
160
161	/*
162	* APP6 SubTypes
163	*/
164	const APP6_EPPIM = "EPPIM";
165	const APP6_NITF = "NITF";
166
167	/*
168	* APP8 SubTypes
169	*/
170	const APP8_SPIFF = "SPIFF";
171
172	/*
173	* APP10 SubTypes
174	*/
175	const APP10_COMMENT = "Comment";
176
177	/*
178	* APP12 SubTypes
179	*/
180	const APP12_PICTUREINFO = "PictureInfo";
181	const APP12_DUCKY = "Ducky";
182
183	/*
184	* APP13 SubTypes
185	*/
186	const APP13_PHOTOSHOP = "Photoshop";
187	const APP13_ADOBECM = "Adobe CM";
188
189	/*
190	* APP14 SubTypes
191	*/
192	const APP14_ADOBE = "Adobe";
193
194	/*
195	* APP15 SubTypes
196	*/
197	const APP15_GRAPHICCONVERTER = "GraphicConverter";
198
199	/*
200	* Other SubTypes
201	*/
202	const SOF0 = "Start Of Frame - Baseline DCT (huffman)";
203	const SOF1 = "Start Of Frame - Extended sequential DCT (huffman)";
204	const SOF2 = "Start Of Frame - Progressive DCT (huffman)";
205	const SOF3 = "Start Of Frame - Spatial (Lossless) DCT (Huffman)";
206	const SOF5 = "Start Of Frame - Differential sequential DCT (Huffman)";
207	const SOF6 = "Start Of Frame - Progressive sequential DCT (Huffman)";
208	const SOF7 = "Start Of Frame - Differential spatial DCT (Huffman)";
209	const SOF9 = "Start Of Frame - Extended sequential DCT (arithmetic)";
210	const SOFA = "Start Of Frame - Progressive DCT (arithmetic)";
211	const SOFB = "Start Of Frame - Spatial (lossless) DCT (arithmetic)";
212	const SOFD = "Start Of Frame - Differential sequential DCT (arithmetic)";
213	const SOFE = "Start Of Frame - Differential progressive DCT (arithmetic)";
214	const SOFF = "Start Of Frame - Differential lossless (arithmetic)";
215	const DHT = "Define Huffman Tables";
216	const JPG = "Reserved for JPEG extensions";
217	const DAC = "Arithmetic Conditionning info";
218	const SOS = "Start Of Scan";
219	const DRI = "Define Restart Interval";
220	const COM = "Comment";
221	const DQT = "Define Quantization Table";
222
223
224
225	private $header = 0xFF;
226	private $offset = 0;
227	private $length = 0;
228	private $subType = "";
229	private $data = NULL;
230	private $dataLoaded = false;
231	private $workData = NULL;
232
233
234	/**
235	* try to read a marker at the designed offset
236	*
237	* @param handler $fileHandler : a handler on an opened and valid file
238	*
239	* @param ULong $offset : where start reading the segment in the file
240	*
241	* @return false if there is no marker at this offset, otherwise returns an
242	* instance of a new AppMarkerSegmentReader object
243	*/
244	static public function read($fileHandler, $offset)
245	{
246	/* if end of file, return false */
247	if(feof($fileHandler)) return(false);
248
249	fseek($fileHandler, $offset);
250	$header=ConvertData::toUByte(fread($fileHandler, 1));
251
252	/*
253	* each segment header start with 0xFF
254	*
255	* if the reader byte equals 0xFF, read the next byte.
256	* the next byte must equals one of the defined segment headers (between
257	* the first and last valid segments)
258	*
259	* if the segment is valid, the next 2 bytes determine the size of the
260	* segment, excluding the header, but including the segment size
261	*
262	*/
263	if($header==self::SEGMENT_HEAD)
264	{
265	$header=ConvertData::toUByte(fread($fileHandler, 1));
266	if(self::isValidMarkerHeader($header))
267	{
268	$length=ConvertData::toUShort(fread($fileHandler, 2), BYTE_ORDER_BIG_ENDIAN);
269	/*
270	* inside a segment, length include the 2 byte designed for the length
271	* size, so to read the associated data, needs to read length-2bytes
272	*
273	* the length exclude the 2bytes needed for the header identifier
274	*
275	*/
276	$datas=fread($fileHandler, $length-2);
277
278	switch($header)
279	{
280	case self::SEGMENT_APP0:
281	if(preg_match('/^JFIF\x00/',$datas)>0)
282	{
283	$subType=self::APP0_JFIF;
284	}
285	elseif(preg_match('/^JFXX\x00\x10/',$datas)>0)
286	{
287	$subType=self::APP0_JFXX;
288	}
289	elseif(preg_match('/^(II\|MM).{4}HEAPJPGM/s',$datas)>0)
290	{
291	$subType=self::APP0_CIFF;
292	}
293	elseif(preg_match('/^AVI1/s',$datas)>0)
294	{
295	$subType=self::APP0_AVI1;
296	}
297	else
298	{
299	$subType=self::UNKNOWN;
300	}
301	break;
302	case self::SEGMENT_APP1:
303	if(preg_match('/^Exif\x00\x00/',$datas)>0)
304	{
305	$subType=self::APP1_EXIF;
306	$datas = substr($datas, 6);
307	}
308	elseif(preg_match('/^http:\/\/ns.adobe.com\/xmp\/extension\/\x00/',$datas)>0)
309	{
310	$subType=self::APP1_EXTENDEDXMP;
311	}
312	elseif(preg_match('/^(http:\/\/\|<exif:)/',$datas)>0)
313	{
314	$subType=self::APP1_XMP;
315	}
316	else
317	{
318	$subType=self::UNKNOWN;
319	}
320	break;
321	case self::SEGMENT_APP2:
322	if(preg_match('/^ICC_PROFILE\x00/',$datas)>0)
323	{
324	$subType=self::APP2_ICCPROFILE;
325	}
326	elseif(preg_match('/^FPXR\x00/',$datas)>0)
327	{
328	$subType=self::APP2_FPXR;
329	}
330	elseif(preg_match('/^MPF\x00/',$datas)>0)
331	{
332	$subType=self::APP2_MPF;
333	}
334	elseif(preg_match('/^\xff\xd8\xff\xdb/',$datas)>0)
335	{
336	$subType=self::APP2_SAMSUNGLP;
337	}
338	else
339	{
340	$subType=self::UNKNOWN;
341	}
342	break;
343	case self::SEGMENT_APP3:
344	if(preg_match('/^(Meta\|META\|Exif)\x00\x00/',$datas)>0)
345	{
346	$subType=self::APP3_META;
347	}
348	elseif(preg_match('/^Stim\x00/',$datas)>0)
349	{
350	$subType=self::APP3_STIM;
351	}
352	else
353	{
354	$subType=self::UNKNOWN;
355	}
356	break;
357	case self::SEGMENT_APP4:
358	if(preg_match('/^SCALADO\x00/',$datas)>0)
359	{
360	$subType=self::APP4_SCALADO;
361	}
362	else
363	{
364	$subType=self::UNKNOWN;
365	}
366	break;
367	case self::SEGMENT_APP5:
368	if(preg_match('/^RMETA\x00/',$datas)>0)
369	{
370	$subType=self::APP5_RMETA;
371	}
372	else
373	{
374	$subType=self::UNKNOWN;
375	}
376	break;
377	case self::SEGMENT_APP6:
378	if(preg_match('/^EPPIM\x00/',$datas)>0)
379	{
380	$subType=self::APP6_EPPIM;
381	}
382	elseif(preg_match('/^NTIF\x00/',$datas)>0)
383	{
384	$subType=self::APP6_NTIF;
385	}
386	else
387	{
388	$subType=self::UNKNOWN;
389	}
390	break;
391	case self::SEGMENT_APP7:
392	$subType=self::UNKNOWN;
393	break;
394	case self::SEGMENT_APP8:
395	if(preg_match('/^SPIFF\x00/',$datas)>0)
396	{
397	$subType=self::APP8_SPIFF;
398	}
399	else
400	{
401	$subType=self::UNKNOWN;
402	}
403	break;
404	case self::SEGMENT_APP9:
405	$subType=self::UNKNOWN;
406	break;
407	case self::SEGMENT_APP10:
408	if(preg_match('/^UNICODE\x00/',$datas)>0)
409	{
410	$subType=self::APP10_COMMENT;
411	}
412	else
413	{
414	$subType=self::UNKNOWN;
415	}
416	break;
417	case self::SEGMENT_APP11:
418	$subType=self::UNKNOWN;
419	break;
420	case self::SEGMENT_APP12:
421	if(preg_match('/^(\[picture info\]\|Type=)/',$datas)>0)
422	{
423	$subType=self::APP12_PICTUREINFO;
424	}
425	elseif(preg_match('/^Ducky/',$datas)>0)
426	{
427	$subType=self::APP12_DUCKY;
428	}
429	else
430	{
431	$subType=self::UNKNOWN;
432	}
433	break;
434	case self::SEGMENT_APP13:
435	if(preg_match('/^(Photoshop 3.0\0\|Adobe_Photoshop2.5)/',$datas)>0)
436	{
437	$subType=self::APP13_PHOTOSHOP;
438	}
439	elseif(preg_match('/^Adobe_CM/',$datas)>0)
440	{
441	$subType=self::APP13_ADOBECM;
442	}
443	else
444	{
445	$subType=self::UNKNOWN;
446	}
447	break;
448	case self::SEGMENT_APP14:
449	if(preg_match('/^Adobe/',$datas)>0)
450	{
451	$subType=self::APP14_ADOBE;
452	}
453	else
454	{
455	$subType=self::UNKNOWN;
456	}
457	break;
458	case self::SEGMENT_APP15:
459	if(preg_match('/^Q\s*(\d+)/',$datas)>0)
460	{
461	$subType=self::APP15_GRAPHICCONVERTER;
462	}
463	else
464	{
465	$subType=self::UNKNOWN;
466	}
467	break;
468	case self::SEGMENT_DQT:
469	$subType=self::DQT;
470	break;
471	case self::SEGMENT_SOF0:
472	$subType=self::SOF0;
473	break;
474	case self::SEGMENT_SOF1:
475	$subType=self::SOF1;
476	break;
477	case self::SEGMENT_SOF2:
478	$subType=self::SOF2;
479	break;
480	case self::SEGMENT_SOF3:
481	$subType=self::SOF3;
482	break;
483	case self::SEGMENT_SOF5:
484	$subType=self::SOF5;
485	break;
486	case self::SEGMENT_SOF6:
487	$subType=self::SOF6;
488	break;
489	case self::SEGMENT_SOF7:
490	$subType=self::SOF7;
491	break;
492	case self::SEGMENT_SOF9:
493	$subType=self::SOF9;
494	break;
495	case self::SEGMENT_SOFA:
496	$subType=self::SOFA;
497	break;
498	case self::SEGMENT_SOFB:
499	$subType=self::SOFB;
500	break;
501	case self::SEGMENT_SOFD:
502	$subType=self::SOFD;
503	break;
504	case self::SEGMENT_SOFE:
505	$subType=self::SOFE;
506	break;
507	case self::SEGMENT_SOFF:
508	$subType=self::SOFF;
509	break;
510	case self::SEGMENT_DHT:
511	$subType=self::DHT;
512	break;
513	case self::SEGMENT_JPG:
514	$subType=self::JPG;
515	break;
516	case self::SEGMENT_DAC:
517	$subType=self::DAC;
518	break;
519	case self::SEGMENT_SOS:
520	$subType=self::SOS;
521	break;
522	case self::SEGMENT_DRI:
523	$subType=self::DRI;
524	break;
525	case self::SEGMENT_COM:
526	$subType=self::COM;
527	break;
528	default:
529	/* in other case, return an new object Marker */
530	$subType=self::UNKNOWN;
531	}
532	return(new AppMarkerSegmentReader($header, $offset, $length+2, $subType, $datas));
533	}
534	}
535
536	return(false);
537	}
538
539	/**
540	* returns true if the given segment marker is a known segment
541	*
542	* @param UByte $value : the identifier of the segment
543	* @return Boolean
544	*/
545	static function isValidMarkerHeader($value)
546	{
547	if($value==self::SEGMENT_HEAD or
548	$value==self::SEGMENT_APP0 or
549	$value==self::SEGMENT_APP1 or
550	$value==self::SEGMENT_APP2 or
551	$value==self::SEGMENT_APP3 or
552	$value==self::SEGMENT_APP4 or
553	$value==self::SEGMENT_APP5 or
554	$value==self::SEGMENT_APP6 or
555	$value==self::SEGMENT_APP7 or
556	$value==self::SEGMENT_APP8 or
557	$value==self::SEGMENT_APP9 or
558	$value==self::SEGMENT_APP10 or
559	$value==self::SEGMENT_APP11 or
560	$value==self::SEGMENT_APP12 or
561	$value==self::SEGMENT_APP13 or
562	$value==self::SEGMENT_APP14 or
563	$value==self::SEGMENT_APP15 or
564	$value==self::SEGMENT_SOF0 or
565	$value==self::SEGMENT_SOF1 or
566	$value==self::SEGMENT_SOF2 or
567	$value==self::SEGMENT_SOF3 or
568	$value==self::SEGMENT_SOF5 or
569	$value==self::SEGMENT_SOF6 or
570	$value==self::SEGMENT_SOF7 or
571	$value==self::SEGMENT_SOF9 or
572	$value==self::SEGMENT_SOFA or
573	$value==self::SEGMENT_SOFB or
574	$value==self::SEGMENT_SOFD or
575	$value==self::SEGMENT_SOFE or
576	$value==self::SEGMENT_SOFF or
577	$value==self::SEGMENT_DHT or
578	$value==self::SEGMENT_JPG or
579	$value==self::SEGMENT_DAC or
580	$value==self::SEGMENT_SOS or
581	$value==self::SEGMENT_DRI or
582	$value==self::SEGMENT_COM or
583	$value==self::SEGMENT_DQT)
584	{
585	return(true);
586	}
587	return(false);
588	}
589
590	/**
591	* returns the name of the given segment
592	*
593	* @param UByte $value : the identifier of the segment
594	*
595	* @return String
596	*/
597	static function markerName($value)
598	{
599	switch($value)
600	{
601	case self::SEGMENT_APP0:
602	return("APP0");
603	case self::SEGMENT_APP1:
604	return("APP1");
605	case self::SEGMENT_APP2:
606	return("APP2");
607	case self::SEGMENT_APP3:
608	return("APP3");
609	case self::SEGMENT_APP4:
610	return("APP4");
611	case self::SEGMENT_APP5:
612	return("APP5");
613	case self::SEGMENT_APP6:
614	return("APP6");
615	case self::SEGMENT_APP7:
616	return("APP7");
617	case self::SEGMENT_APP8:
618	return("APP8");
619	case self::SEGMENT_APP9:
620	return("APP9");
621	case self::SEGMENT_APP10:
622	return("APP10");
623	case self::SEGMENT_APP11:
624	return("APP11");
625	case self::SEGMENT_APP12:
626	return("APP12");
627	case self::SEGMENT_APP13:
628	return("APP13");
629	case self::SEGMENT_APP14:
630	return("APP14");
631	case self::SEGMENT_APP15:
632	return("APP15");
633	case self::SEGMENT_DQT:
634	return("DQT");
635	case self::SEGMENT_SOF0:
636	return("SOF0");
637	case self::SEGMENT_SOF1:
638	return("SOF1");
639	case self::SEGMENT_SOF2:
640	return("SOF2");
641	case self::SEGMENT_SOF3:
642	return("SOF3");
643	case self::SEGMENT_SOF5:
644	return("SOF5");
645	case self::SEGMENT_SOF6:
646	return("SOF6");
647	case self::SEGMENT_SOF7:
648	return("SOF7");
649	case self::SEGMENT_SOF9:
650	return("SOF9");
651	case self::SEGMENT_SOFA:
652	return("SOFA");
653	case self::SEGMENT_SOFB:
654	return("SOFB");
655	case self::SEGMENT_SOFD:
656	return("SOFD");
657	case self::SEGMENT_SOFE:
658	return("SOFE");
659	case self::SEGMENT_SOFF:
660	return("SOFF");
661	case self::SEGMENT_DHT:
662	return("DHT");
663	case self::SEGMENT_JPG:
664	return("JPG");
665	case self::SEGMENT_DAC:
666	return("DAC");
667	case self::SEGMENT_SOS:
668	return("SOS");
669	case self::SEGMENT_DRI:
670	return("DRI");
671	case self::SEGMENT_COM:
672	return("COM");
673	default:
674	return(sprintf("%02x", $value));
675	}
676	}
677
678
679	/**
680	*
681	*
682	* @param UByte $header : the identifier of the segment
683	*
684	* @param ULong $offset : offset of the segment in the jpeg file
685	*
686	* @param UShort $length : size of the segment, including the header and
687	* including the segment size (4bytes)
688	*
689	* @param String $subType : the subtype of the segment (for example an APP1
690	* segment can have EXIF or XMP datas)
691	*
692	* @param String $data : the raw data of the segment, excluding the
693	* segment size and header
694	*
695	*/
696	function __construct($header, $offset, $length, $subType, $data)
697	{
698	$this->header = $header;
699	$this->offset = $offset;
700	$this->length = $length;
701	$this->subType = $subType;
702	$this->workData = new Data($data);
703
704	$this->readData();
705
706	$this->workData->clear();
707	}
708
709	function __destruct()
710	{
711	unset($this->workData);
712	unset($this->data);
713	}
714
715	/**
716	* returns the identifiant of the segment (see the consts SEGMENT_xxxxxx for
717	* to know the list)
718	*
719	* @return UByte
720	*/
721	public function getHeader()
722	{
723	return($this->header);
724	}
725
726
727	/**
728	* returns the offset of the segment in the jpeg file
729	*
730	* @return ULong
731	*/
732	public function getOffset()
733	{
734	return($this->offset);
735	}
736
737	/**
738	* returns the length of the segment, including the segment header and the
739	* segment size (4 bytes)
740	*
741	* @return UShort
742	*/
743	public function getLength()
744	{
745	return($this->length);
746	}
747
748	/**
749	* returns the subtype of the segment
750	*
751	* @return String
752	*/
753	public function getSubType()
754	{
755	return($this->subType);
756	}
757
758	/**
759	* returns true if the segment data has been loaded
760	*
761	* @return Boolean
762	*/
763	public function dataLoaded()
764	{
765	return($this->dataLoaded);
766	}
767
768	/**
769	* returns the data of the segment.
770	*
771	* @return depends on the segment subtype
772	*/
773	public function getData()
774	{
775	return($this->data);
776	}
777
778
779	/**
780	* read the segment datas
781	*/
782	private function readData()
783	{
784	switch($this->header)
785	{
786	case self::SEGMENT_APP0:
787	/* not implemented */
788	break;
789	case self::SEGMENT_APP1:
790	$this->readSegmentAPP1();
791	break;
792	case self::SEGMENT_APP2:
793	/* not implemented */
794	break;
795	case self::SEGMENT_APP3:
796	/* not implemented */
797	break;
798	case self::SEGMENT_APP4:
799	/* not implemented */
800	break;
801	case self::SEGMENT_APP5:
802	/* not implemented */
803	break;
804	case self::SEGMENT_APP6:
805	/* not implemented */
806	break;
807	case self::SEGMENT_APP7:
808	/* not implemented */
809	break;
810	case self::SEGMENT_APP8:
811	/* not implemented */
812	break;
813	case self::SEGMENT_APP9:
814	/* not implemented */
815	break;
816	case self::SEGMENT_APP10:
817	/* not implemented */
818	break;
819	case self::SEGMENT_APP11:
820	/* not implemented */
821	break;
822	case self::SEGMENT_APP12:
823	/* not implemented */
824	break;
825	case self::SEGMENT_APP13:
826	$this->readSegmentAPP13();
827	break;
828	case self::SEGMENT_APP14:
829	/* not implemented */
830	break;
831	case self::SEGMENT_APP15:
832	/* not implemented */
833	break;
834	case self::SEGMENT_COM:
835	$this->readSegmentCOM();
836	break;
837	default:
838	break;
839	}
840	}
841
842	/**
843	* read the content of an "APP1" segment
844	*/
845	private function readSegmentAPP1()
846	{
847	switch($this->subType)
848	{
849	case self::APP1_EXIF:
850	$this->data = new TiffReader($this->workData, $this->offset+10);
851	$this->dataLoaded=true;
852	break;
853	case self::APP1_XMP:
854	$this->data = new XmpReader($this->workData->readASCII());
855	$this->dataLoaded=true;
856	break;
857	case self::APP1_EXTENDED:
858	$this->data = $this->workData->readASCII();
859	$this->dataLoaded=true;
860	break;
861	default:
862	break;
863	}
864	}
865
866	/**
867	* read the content of an "APP13" segment
868	*/
869	private function readSegmentAPP13()
870	{
871	switch($this->subType)
872	{
873	case self::APP13_PHOTOSHOP:
874	$this->data = new IptcReader($this->workData->readASCII());
875	$this->dataLoaded=true;
876	break;
877	case self::APP13_ADOBECM:
878	break;
879	default:
880	break;
881	}
882	}
883
884	/**
885	* read the content of an "COM" segment
886	*/
887	private function readSegmentCOM()
888	{
889	$this->data = $this->workData->readASCII();
890	$this->dataLoaded=true;
891	}
892
893	public function toString()
894	{
895	$returned="Header: 0xff".sprintf("%02x", $this->header)." (".self::markerName($this->header).")".
896	" ; offset: 0x".sprintf("%08x", $this->offset).
897	" ; length: 0x".sprintf("%04x", $this->length).
898	" ; subType: ".$this->subType;
899	return($returned);
900	}
901
902
903	}
904
905
906	?>

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