<?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.lyrics3.php                                      //

// module for analyzing Lyrics3 tags                           //

// dependencies: module.tag.apetag.php (optional)              //

//                                                            ///

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

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

	exit;

}

class getid3_lyrics3 extends getid3_handler

{

	/**

	 * @return bool

	 */

	public function Analyze() {

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

		// http://www.volweb.cz/str/tags.htm

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

			$this->warning('Unable to check for Lyrics3 because file is larger than '.round(PHP_INT_MAX / 1073741824).'GB');

			return false;

		}

		$this->fseek((0 - 128 - 9 - 6), SEEK_END);          // end - ID3v1 - "LYRICSEND" - [Lyrics3size]

		$lyrics3_id3v1 = $this->fread(128 + 9 + 6);

		$lyrics3lsz    = (int) substr($lyrics3_id3v1, 0, 6); // Lyrics3size

		$lyrics3end    = substr($lyrics3_id3v1,  6,   9); // LYRICSEND or LYRICS200

		$id3v1tag      = substr($lyrics3_id3v1, 15, 128); // ID3v1

		if ($lyrics3end == 'LYRICSEND') {

			// Lyrics3v1, ID3v1, no APE

			$lyrics3size    = 5100;

			$lyrics3offset  = $info['filesize'] - 128 - $lyrics3size;

			$lyrics3version = 1;

		} elseif ($lyrics3end == 'LYRICS200') {

			// Lyrics3v2, ID3v1, no APE

			// LSZ = lyrics + 'LYRICSBEGIN'; add 6-byte size field; add 'LYRICS200'

			$lyrics3size    = $lyrics3lsz + 6 + strlen('LYRICS200');

			$lyrics3offset  = $info['filesize'] - 128 - $lyrics3size;

			$lyrics3version = 2;

		} elseif (substr(strrev($lyrics3_id3v1), 0, 9) == strrev('LYRICSEND')) {

			// Lyrics3v1, no ID3v1, no APE

			$lyrics3size    = 5100;

			$lyrics3offset  = $info['filesize'] - $lyrics3size;

			$lyrics3version = 1;

			$lyrics3offset  = $info['filesize'] - $lyrics3size;

		} elseif (substr(strrev($lyrics3_id3v1), 0, 9) == strrev('LYRICS200')) {

			// Lyrics3v2, no ID3v1, no APE

			$lyrics3size    = (int) strrev(substr(strrev($lyrics3_id3v1), 9, 6)) + 6 + strlen('LYRICS200'); // LSZ = lyrics + 'LYRICSBEGIN'; add 6-byte size field; add 'LYRICS200'

			$lyrics3offset  = $info['filesize'] - $lyrics3size;

			$lyrics3version = 2;

		} else {

			if (isset($info['ape']['tag_offset_start']) && ($info['ape']['tag_offset_start'] > 15)) {

				$this->fseek($info['ape']['tag_offset_start'] - 15);

				$lyrics3lsz = $this->fread(6);

				$lyrics3end = $this->fread(9);

				if ($lyrics3end == 'LYRICSEND') {

					// Lyrics3v1, APE, maybe ID3v1

					$lyrics3size    = 5100;

					$lyrics3offset  = $info['ape']['tag_offset_start'] - $lyrics3size;

					$info['avdataend'] = $lyrics3offset;

					$lyrics3version = 1;

					$this->warning('APE tag located after Lyrics3, will probably break Lyrics3 compatability');

				} elseif ($lyrics3end == 'LYRICS200') {

					// Lyrics3v2, APE, maybe ID3v1

					$lyrics3size    = $lyrics3lsz + 6 + strlen('LYRICS200'); // LSZ = lyrics + 'LYRICSBEGIN'; add 6-byte size field; add 'LYRICS200'

					$lyrics3offset  = $info['ape']['tag_offset_start'] - $lyrics3size;

					$lyrics3version = 2;

					$this->warning('APE tag located after Lyrics3, will probably break Lyrics3 compatability');

				}

			}

		}

		if (isset($lyrics3offset) && isset($lyrics3version) && isset($lyrics3size)) {

			$info['avdataend'] = $lyrics3offset;

			$this->getLyrics3Data($lyrics3offset, $lyrics3version, $lyrics3size);

			if (!isset($info['ape'])) {

				if (isset($info['lyrics3']['tag_offset_start'])) {

					$GETID3_ERRORARRAY = &$info['warning'];

					getid3_lib::IncludeDependency(GETID3_INCLUDEPATH.'module.tag.apetag.php', __FILE__, true);

					$getid3_temp = new getID3();

					$getid3_temp->openfile($this->getid3->filename, $this->getid3->info['filesize'], $this->getid3->fp);

					$getid3_apetag = new getid3_apetag($getid3_temp);

					$getid3_apetag->overrideendoffset = $info['lyrics3']['tag_offset_start'];

					$getid3_apetag->Analyze();

					if (!empty($getid3_temp->info['ape'])) {

						$info['ape'] = $getid3_temp->info['ape'];

					}

					if (!empty($getid3_temp->info['replay_gain'])) {

						$info['replay_gain'] = $getid3_temp->info['replay_gain'];

					}

					unset($getid3_temp, $getid3_apetag);

				} else {

					$this->warning('Lyrics3 and APE tags appear to have become entangled (most likely due to updating the APE tags with a non-Lyrics3-aware tagger)');

				}

			}

		}

		return true;

	}

	/**

	 * @param int $endoffset

	 * @param int $version

	 * @param int $length

	 *

	 * @return bool

	 */

	public function getLyrics3Data($endoffset, $version, $length) {

		// http://www.volweb.cz/str/tags.htm

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

		if (!getid3_lib::intValueSupported($endoffset)) {

			$this->warning('Unable to check for Lyrics3 because file is larger than '.round(PHP_INT_MAX / 1073741824).'GB');

			return false;

		}

		$this->fseek($endoffset);

		if ($length <= 0) {

			return false;

		}

		$rawdata = $this->fread($length);

		$ParsedLyrics3 = array();

		$ParsedLyrics3['raw']['lyrics3version'] = $version;

		$ParsedLyrics3['raw']['lyrics3tagsize'] = $length;

		$ParsedLyrics3['tag_offset_start']      = $endoffset;

		$ParsedLyrics3['tag_offset_end']        = $endoffset + $length - 1;

		if (substr($rawdata, 0, 11) != 'LYRICSBEGIN') {

			if (strpos($rawdata, 'LYRICSBEGIN') !== false) {

				$this->warning('"LYRICSBEGIN" expected at '.$endoffset.' but actually found at '.($endoffset + strpos($rawdata, 'LYRICSBEGIN')).' - this is invalid for Lyrics3 v'.$version);

				$info['avdataend'] = $endoffset + strpos($rawdata, 'LYRICSBEGIN');

				$rawdata = substr($rawdata, strpos($rawdata, 'LYRICSBEGIN'));

				$length = strlen($rawdata);

				$ParsedLyrics3['tag_offset_start'] = $info['avdataend'];

				$ParsedLyrics3['raw']['lyrics3tagsize'] = $length;

			} else {

				$this->error('"LYRICSBEGIN" expected at '.$endoffset.' but found "'.substr($rawdata, 0, 11).'" instead');

				return false;

			}

		}

		switch ($version) {

			case 1:

				if (substr($rawdata, strlen($rawdata) - 9, 9) == 'LYRICSEND') {

					$ParsedLyrics3['raw']['LYR'] = trim(substr($rawdata, 11, strlen($rawdata) - 11 - 9));

					$this->Lyrics3LyricsTimestampParse($ParsedLyrics3);

				} else {

					$this->error('"LYRICSEND" expected at '.($this->ftell() - 11 + $length - 9).' but found "'.substr($rawdata, strlen($rawdata) - 9, 9).'" instead');

					return false;

				}

				break;

			case 2:

				if (substr($rawdata, strlen($rawdata) - 9, 9) == 'LYRICS200') {

					$ParsedLyrics3['raw']['unparsed'] = substr($rawdata, 11, strlen($rawdata) - 11 - 9 - 6); // LYRICSBEGIN + LYRICS200 + LSZ

					$rawdata = $ParsedLyrics3['raw']['unparsed'];

					while (strlen($rawdata) > 0) {

						$fieldname = substr($rawdata, 0, 3);

						$fieldsize = (int) substr($rawdata, 3, 5);

						$ParsedLyrics3['raw'][$fieldname] = substr($rawdata, 8, $fieldsize);

						$rawdata = substr($rawdata, 3 + 5 + $fieldsize);

					}

					if (isset($ParsedLyrics3['raw']['IND'])) {

						$i = 0;

						$flagnames = array('lyrics', 'timestamps', 'inhibitrandom');

						foreach ($flagnames as $flagname) {

							if (strlen($ParsedLyrics3['raw']['IND']) > $i++) {

								$ParsedLyrics3['flags'][$flagname] = $this->IntString2Bool(substr($ParsedLyrics3['raw']['IND'], $i, 1 - 1));

							}

						}

					}

					$fieldnametranslation = array('ETT'=>'title', 'EAR'=>'artist', 'EAL'=>'album', 'INF'=>'comment', 'AUT'=>'author');

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

						if (isset($ParsedLyrics3['raw'][$key])) {

							$ParsedLyrics3['comments'][$value][] = trim($ParsedLyrics3['raw'][$key]);

						}

					}

					if (isset($ParsedLyrics3['raw']['IMG'])) {

						$imagestrings = explode("\r\n", $ParsedLyrics3['raw']['IMG']);

						foreach ($imagestrings as $key => $imagestring) {

							if (strpos($imagestring, '||') !== false) {

								$imagearray = explode('||', $imagestring);

								$ParsedLyrics3['images'][$key]['filename']     =                                (isset($imagearray[0]) ? $imagearray[0] : '');

								$ParsedLyrics3['images'][$key]['description']  =                                (isset($imagearray[1]) ? $imagearray[1] : '');

								$ParsedLyrics3['images'][$key]['timestamp']    = $this->Lyrics3Timestamp2Seconds(isset($imagearray[2]) ? $imagearray[2] : '');

							}

						}

					}

					if (isset($ParsedLyrics3['raw']['LYR'])) {

						$this->Lyrics3LyricsTimestampParse($ParsedLyrics3);

					}

				} else {

					$this->error('"LYRICS200" expected at '.($this->ftell() - 11 + $length - 9).' but found "'.substr($rawdata, strlen($rawdata) - 9, 9).'" instead');

					return false;

				}

				break;

			default:

				$this->error('Cannot process Lyrics3 version '.$version.' (only v1 and v2)');

				return false;

		}

		if (isset($info['id3v1']['tag_offset_start']) && ($info['id3v1']['tag_offset_start'] <= $ParsedLyrics3['tag_offset_end'])) {

			$this->warning('ID3v1 tag information ignored since it appears to be a false synch in Lyrics3 tag data');

			unset($info['id3v1']);

			foreach ($info['warning'] as $key => $value) {

				if ($value == 'Some ID3v1 fields do not use NULL characters for padding') {

					unset($info['warning'][$key]);

					sort($info['warning']);

					break;

				}

			}

		}

		$info['lyrics3'] = $ParsedLyrics3;

		return true;

	}

	/**

	 * @param string $rawtimestamp

	 *

	 * @return int|false

	 */

	public function Lyrics3Timestamp2Seconds($rawtimestamp) {

		if (preg_match('#^\\[([0-9]{2}):([0-9]{2})\\]$#', $rawtimestamp, $regs)) {

			return (int) (($regs[1] * 60) + $regs[2]);

		}

		return false;

	}

	/**

	 * @param array $Lyrics3data

	 *

	 * @return bool

	 */

	public function Lyrics3LyricsTimestampParse(&$Lyrics3data) {

		$lyricsarray = explode("\r\n", $Lyrics3data['raw']['LYR']);

		$notimestamplyricsarray = array();

		foreach ($lyricsarray as $key => $lyricline) {

			$regs = array();

			unset($thislinetimestamps);

			while (preg_match('#^(\\[[0-9]{2}:[0-9]{2}\\])#', $lyricline, $regs)) {

				$thislinetimestamps[] = $this->Lyrics3Timestamp2Seconds($regs[0]);

				$lyricline = str_replace($regs[0], '', $lyricline);

			}

			$notimestamplyricsarray[$key] = $lyricline;

			if (isset($thislinetimestamps) && is_array($thislinetimestamps)) {

				sort($thislinetimestamps);

				foreach ($thislinetimestamps as $timestampkey => $timestamp) {

					if (isset($Lyrics3data['synchedlyrics'][$timestamp])) {

						// timestamps only have a 1-second resolution, it's possible that multiple lines

						// could have the same timestamp, if so, append

						$Lyrics3data['synchedlyrics'][$timestamp] .= "\r\n".$lyricline;

					} else {

						$Lyrics3data['synchedlyrics'][$timestamp] = $lyricline;

					}

				}

			}

		}

		$Lyrics3data['unsynchedlyrics'] = implode("\r\n", $notimestamplyricsarray);

		if (isset($Lyrics3data['synchedlyrics']) && is_array($Lyrics3data['synchedlyrics'])) {

			ksort($Lyrics3data['synchedlyrics']);

		}

		return true;

	}

	/**

	 * @param string $char

	 *

	 * @return bool|null

	 */

	public function IntString2Bool($char) {

		if ($char == '1') {

			return true;

		} elseif ($char == '0') {

			return false;

		}

		return null;

	}

}