<?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.tag.id3v1.php                                        //

// module for analyzing ID3v1 tags                             //

// dependencies: NONE                                          //

//                                                            ///

/////////////////////////////////////////////////////////////////

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

	exit;

}

class getid3_id3v1 extends getid3_handler

{

	/**

	 * @return bool

	 */

	public function Analyze() {

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

		if (!getid3_lib::intValueSupported($info['filesize'])) {

			$this->warning('Unable to check for ID3v1 because file is larger than '.round(PHP_INT_MAX / 1073741824).'GB');

			return false;

		}

		if($info['filesize'] < 256) {

			$this->fseek(-128, SEEK_END);

			$preid3v1 = '';

			$id3v1tag = $this->fread(128);

		} else {

			$this->fseek(-256, SEEK_END);

			$preid3v1 = $this->fread(128);

			$id3v1tag = $this->fread(128);

		}

		if (substr($id3v1tag, 0, 3) == 'TAG') {

			$info['avdataend'] = $info['filesize'] - 128;

			$ParsedID3v1            = array();

			$ParsedID3v1['title']   = $this->cutfield(substr($id3v1tag,   3, 30));

			$ParsedID3v1['artist']  = $this->cutfield(substr($id3v1tag,  33, 30));

			$ParsedID3v1['album']   = $this->cutfield(substr($id3v1tag,  63, 30));

			$ParsedID3v1['year']    = $this->cutfield(substr($id3v1tag,  93,  4));

			$ParsedID3v1['comment'] =                 substr($id3v1tag,  97, 30);  // can't remove nulls yet, track detection depends on them

			$ParsedID3v1['genreid'] =             ord(substr($id3v1tag, 127,  1));

			// If second-last byte of comment field is null and last byte of comment field is non-null

			// then this is ID3v1.1 and the comment field is 28 bytes long and the 30th byte is the track number

			if (($id3v1tag[125] === "\x00") && ($id3v1tag[126] !== "\x00")) {

				$ParsedID3v1['track_number'] = ord(substr($ParsedID3v1['comment'], 29,  1));

				$ParsedID3v1['comment']      =     substr($ParsedID3v1['comment'],  0, 28);

			}

			$ParsedID3v1['comment'] = $this->cutfield($ParsedID3v1['comment']);

			$ParsedID3v1['genre'] = $this->LookupGenreName($ParsedID3v1['genreid']);

			if (!empty($ParsedID3v1['genre'])) {

				unset($ParsedID3v1['genreid']);

			}

			if (empty($ParsedID3v1['genre']) || ($ParsedID3v1['genre'] == 'Unknown')) {

				unset($ParsedID3v1['genre']);

			}

			foreach ($ParsedID3v1 as $key => $value) {

				$ParsedID3v1['comments'][$key][0] = $value;

			}

			$ID3v1encoding = $this->getid3->encoding_id3v1;

			if ($this->getid3->encoding_id3v1_autodetect) {

				// ID3v1 encoding detection hack START

				// ID3v1 is defined as always using ISO-8859-1 encoding, but it is not uncommon to find files tagged with ID3v1 using Windows-1251 or other character sets

				// Since ID3v1 has no concept of character sets there is no certain way to know we have the correct non-ISO-8859-1 character set, but we can guess

				foreach ($ParsedID3v1['comments'] as $tag_key => $valuearray) {

					foreach ($valuearray as $key => $value) {

						if (preg_match('#^[\\x00-\\x40\\x80-\\xFF]+$#', $value) && !ctype_digit((string) $value)) { // check for strings with only characters above chr(128) and punctuation/numbers, but not just numeric strings (e.g. track numbers or years)

							foreach (array('Windows-1251', 'KOI8-R') as $id3v1_bad_encoding) {

								if (function_exists('mb_convert_encoding') && @mb_convert_encoding($value, $id3v1_bad_encoding, $id3v1_bad_encoding) === $value) {

									$ID3v1encoding = $id3v1_bad_encoding;

									$this->warning('ID3v1 detected as '.$id3v1_bad_encoding.' text encoding in '.$tag_key);

									break 3;

								} elseif (function_exists('iconv') && @iconv($id3v1_bad_encoding, $id3v1_bad_encoding, $value) === $value) {

									$ID3v1encoding = $id3v1_bad_encoding;

									$this->warning('ID3v1 detected as '.$id3v1_bad_encoding.' text encoding in '.$tag_key);

									break 3;

								}

							}

						}

					}

				}

				// ID3v1 encoding detection hack END

			}

			// ID3v1 data is supposed to be padded with NULL characters, but some taggers pad with spaces

			$GoodFormatID3v1tag = $this->GenerateID3v1Tag(

											$ParsedID3v1['title'],

											$ParsedID3v1['artist'],

											$ParsedID3v1['album'],

											$ParsedID3v1['year'],

											(isset($ParsedID3v1['genre']) ? $this->LookupGenreID($ParsedID3v1['genre']) : false),

											$ParsedID3v1['comment'],

											(!empty($ParsedID3v1['track_number']) ? $ParsedID3v1['track_number'] : ''));

			$ParsedID3v1['padding_valid'] = true;

			if ($id3v1tag !== $GoodFormatID3v1tag) {

				$ParsedID3v1['padding_valid'] = false;

				$this->warning('Some ID3v1 fields do not use NULL characters for padding');

			}

			$ParsedID3v1['tag_offset_end']   = $info['filesize'];

			$ParsedID3v1['tag_offset_start'] = $ParsedID3v1['tag_offset_end'] - 128;

			$info['id3v1'] = $ParsedID3v1;

			$info['id3v1']['encoding'] = $ID3v1encoding;

		}

		if (substr($preid3v1, 0, 3) == 'TAG') {

			// The way iTunes handles tags is, well, brain-damaged.

			// It completely ignores v1 if ID3v2 is present.

			// This goes as far as adding a new v1 tag *even if there already is one*

			// A suspected double-ID3v1 tag has been detected, but it could be that

			// the "TAG" identifier is a legitimate part of an APE or Lyrics3 tag

			if (substr($preid3v1, 96, 8) == 'APETAGEX') {

				// an APE tag footer was found before the last ID3v1, assume false "TAG" synch

			} elseif (substr($preid3v1, 119, 6) == 'LYRICS') {

				// a Lyrics3 tag footer was found before the last ID3v1, assume false "TAG" synch

			} else {

				// APE and Lyrics3 footers not found - assume double ID3v1

				$this->warning('Duplicate ID3v1 tag detected - this has been known to happen with iTunes');

				$info['avdataend'] -= 128;

			}

		}

		return true;

	}

	/**

	 * @param string $str

	 *

	 * @return string

	 */

	public static function cutfield($str) {

		return trim(substr($str, 0, strcspn($str, "\x00")));

	}

	/**

	 * @param bool $allowSCMPXextended

	 *

	 * @return string[]

	 */

	public static function ArrayOfGenres($allowSCMPXextended=false) {

		static $GenreLookup = array(

			0    => 'Blues',

			1    => 'Classic Rock',

			2    => 'Country',

			3    => 'Dance',

			4    => 'Disco',

			5    => 'Funk',

			6    => 'Grunge',

			7    => 'Hip-Hop',

			8    => 'Jazz',

			9    => 'Metal',

			10   => 'New Age',

			11   => 'Oldies',

			12   => 'Other',

			13   => 'Pop',

			14   => 'R&B',

			15   => 'Rap',

			16   => 'Reggae',

			17   => 'Rock',

			18   => 'Techno',

			19   => 'Industrial',

			20   => 'Alternative',

			21   => 'Ska',

			22   => 'Death Metal',

			23   => 'Pranks',

			24   => 'Soundtrack',

			25   => 'Euro-Techno',

			26   => 'Ambient',

			27   => 'Trip-Hop',

			28   => 'Vocal',

			29   => 'Jazz+Funk',

			30   => 'Fusion',

			31   => 'Trance',

			32   => 'Classical',

			33   => 'Instrumental',

			34   => 'Acid',

			35   => 'House',

			36   => 'Game',

			37   => 'Sound Clip',

			38   => 'Gospel',

			39   => 'Noise',

			40   => 'Alt. Rock',

			41   => 'Bass',

			42   => 'Soul',

			43   => 'Punk',

			44   => 'Space',

			45   => 'Meditative',

			46   => 'Instrumental Pop',

			47   => 'Instrumental Rock',

			48   => 'Ethnic',

			49   => 'Gothic',

			50   => 'Darkwave',

			51   => 'Techno-Industrial',

			52   => 'Electronic',

			53   => 'Pop-Folk',

			54   => 'Eurodance',

			55   => 'Dream',

			56   => 'Southern Rock',

			57   => 'Comedy',

			58   => 'Cult',

			59   => 'Gangsta Rap',

			60   => 'Top 40',

			61   => 'Christian Rap',

			62   => 'Pop/Funk',

			63   => 'Jungle',

			64   => 'Native American',

			65   => 'Cabaret',

			66   => 'New Wave',

			67   => 'Psychedelic',

			68   => 'Rave',

			69   => 'Showtunes',

			70   => 'Trailer',

			71   => 'Lo-Fi',

			72   => 'Tribal',

			73   => 'Acid Punk',

			74   => 'Acid Jazz',

			75   => 'Polka',

			76   => 'Retro',

			77   => 'Musical',

			78   => 'Rock & Roll',

			79   => 'Hard Rock',

			80   => 'Folk',

			81   => 'Folk/Rock',

			82   => 'National Folk',

			83   => 'Swing',

			84   => 'Fast-Fusion',

			85   => 'Bebob',

			86   => 'Latin',

			87   => 'Revival',

			88   => 'Celtic',

			89   => 'Bluegrass',

			90   => 'Avantgarde',

			91   => 'Gothic Rock',

			92   => 'Progressive Rock',

			93   => 'Psychedelic Rock',

			94   => 'Symphonic Rock',

			95   => 'Slow Rock',

			96   => 'Big Band',

			97   => 'Chorus',

			98   => 'Easy Listening',

			99   => 'Acoustic',

			100  => 'Humour',

			101  => 'Speech',

			102  => 'Chanson',

			103  => 'Opera',

			104  => 'Chamber Music',

			105  => 'Sonata',

			106  => 'Symphony',

			107  => 'Booty Bass',

			108  => 'Primus',

			109  => 'Porn Groove',

			110  => 'Satire',

			111  => 'Slow Jam',

			112  => 'Club',

			113  => 'Tango',

			114  => 'Samba',

			115  => 'Folklore',

			116  => 'Ballad',

			117  => 'Power Ballad',

			118  => 'Rhythmic Soul',

			119  => 'Freestyle',

			120  => 'Duet',

			121  => 'Punk Rock',

			122  => 'Drum Solo',

			123  => 'A Cappella',

			124  => 'Euro-House',

			125  => 'Dance Hall',

			126  => 'Goa',

			127  => 'Drum & Bass',

			128  => 'Club-House',

			129  => 'Hardcore',

			130  => 'Terror',

			131  => 'Indie',

			132  => 'BritPop',

			133  => 'Negerpunk',

			134  => 'Polsk Punk',

			135  => 'Beat',

			136  => 'Christian Gangsta Rap',

			137  => 'Heavy Metal',

			138  => 'Black Metal',

			139  => 'Crossover',

			140  => 'Contemporary Christian',

			141  => 'Christian Rock',

			142  => 'Merengue',

			143  => 'Salsa',

			144  => 'Thrash Metal',

			145  => 'Anime',

			146  => 'JPop',

			147  => 'Synthpop',

			148 => 'Abstract',

			149 => 'Art Rock',

			150 => 'Baroque',

			151 => 'Bhangra',

			152 => 'Big Beat',

			153 => 'Breakbeat',

			154 => 'Chillout',

			155 => 'Downtempo',

			156 => 'Dub',

			157 => 'EBM',

			158 => 'Eclectic',

			159 => 'Electro',

			160 => 'Electroclash',

			161 => 'Emo',

			162 => 'Experimental',

			163 => 'Garage',

			164 => 'Global',

			165 => 'IDM',

			166 => 'Illbient',

			167 => 'Industro-Goth',

			168 => 'Jam Band',

			169 => 'Krautrock',

			170 => 'Leftfield',

			171 => 'Lounge',

			172 => 'Math Rock',

			173 => 'New Romantic',

			174 => 'Nu-Breakz',

			175 => 'Post-Punk',

			176 => 'Post-Rock',

			177 => 'Psytrance',

			178 => 'Shoegaze',

			179 => 'Space Rock',

			180 => 'Trop Rock',

			181 => 'World Music',

			182 => 'Neoclassical',

			183 => 'Audiobook',

			184 => 'Audio Theatre',

			185 => 'Neue Deutsche Welle',

			186 => 'Podcast',

			187 => 'Indie-Rock',

			188 => 'G-Funk',

			189 => 'Dubstep',

			190 => 'Garage Rock',

			191 => 'Psybient',

			255  => 'Unknown',

			'CR' => 'Cover',

			'RX' => 'Remix'

		);

		static $GenreLookupSCMPX = array();

		if ($allowSCMPXextended && empty($GenreLookupSCMPX)) {

			$GenreLookupSCMPX = $GenreLookup;

			// http://www.geocities.co.jp/SiliconValley-Oakland/3664/alittle.html#GenreExtended

			// Extended ID3v1 genres invented by SCMPX

			// Note that 255 "Japanese Anime" conflicts with standard "Unknown"

			$GenreLookupSCMPX[240] = 'Sacred';

			$GenreLookupSCMPX[241] = 'Northern Europe';

			$GenreLookupSCMPX[242] = 'Irish & Scottish';

			$GenreLookupSCMPX[243] = 'Scotland';

			$GenreLookupSCMPX[244] = 'Ethnic Europe';

			$GenreLookupSCMPX[245] = 'Enka';

			$GenreLookupSCMPX[246] = 'Children\'s Song';

			$GenreLookupSCMPX[247] = 'Japanese Sky';

			$GenreLookupSCMPX[248] = 'Japanese Heavy Rock';

			$GenreLookupSCMPX[249] = 'Japanese Doom Rock';

			$GenreLookupSCMPX[250] = 'Japanese J-POP';

			$GenreLookupSCMPX[251] = 'Japanese Seiyu';

			$GenreLookupSCMPX[252] = 'Japanese Ambient Techno';

			$GenreLookupSCMPX[253] = 'Japanese Moemoe';

			$GenreLookupSCMPX[254] = 'Japanese Tokusatsu';

			//$GenreLookupSCMPX[255] = 'Japanese Anime';

		}

		return ($allowSCMPXextended ? $GenreLookupSCMPX : $GenreLookup);

	}

	/**

	 * @param string $genreid

	 * @param bool   $allowSCMPXextended

	 *

	 * @return string|false

	 */

	public static function LookupGenreName($genreid, $allowSCMPXextended=true) {

		switch ($genreid) {

			case 'RX':

			case 'CR':

				break;

			default:

				if (!is_numeric($genreid)) {

					return false;

				}