module.tag.id3v2.php

一个用PHP编写的

					$thisfile_id3v2['padding']['start']  = $framedataoffset;
					$thisfile_id3v2['padding']['length'] = strlen($framedata);
					$thisfile_id3v2['padding']['valid']  = true;
					for ($i = 0; $i < $thisfile_id3v2['padding']['length']; $i++) {
						if ($framedata{$i} != "\x00") {
							$thisfile_id3v2['padding']['valid'] = false;
							$thisfile_id3v2['padding']['errorpos'] = $thisfile_id3v2['padding']['start'] + $i;
							$ThisFileInfo['warning'][] = 'Invalid ID3v2 padding found at offset '.$thisfile_id3v2['padding']['errorpos'].' (the remaining '.($thisfile_id3v2['padding']['length'] - $i).' bytes are considered invalid)';
							break;
						}
					}
					break; // skip rest of ID3v2 header
				}

				if ($frame_name == 'COM ') {
					$ThisFileInfo['warning'][] = 'error parsing "'.$frame_name.'" ('.$framedataoffset.' bytes into the ID3v2.'.$id3v2_majorversion.' tag). (ERROR: IsValidID3v2FrameName("'.str_replace("\x00", ' ', $frame_name).'", '.$id3v2_majorversion.'))). [Note: this particular error has been known to happen with tags edited by iTunes (versions "X v2.0.3", "v3.0.1" are known-guilty, probably others too)]';
					$frame_name = 'COMM';
				}
				if (($frame_size <= strlen($framedata)) && ($this->IsValidID3v2FrameName($frame_name, $id3v2_majorversion))) {

					unset($parsedFrame);
					$parsedFrame['frame_name']      = $frame_name;
					$parsedFrame['frame_flags_raw'] = $frame_flags;
					$parsedFrame['data']            = substr($framedata, 0, $frame_size);
					$parsedFrame['datalength']      = getid3_lib::CastAsInt($frame_size);
					$parsedFrame['dataoffset']      = $framedataoffset;

					$this->ParseID3v2Frame($parsedFrame, $ThisFileInfo);
					$thisfile_id3v2[$frame_name][] = $parsedFrame;

					$framedata = substr($framedata, $frame_size);

				} else { // invalid frame length or FrameID

					if ($frame_size <= strlen($framedata)) {

						if ($this->IsValidID3v2FrameName(substr($framedata, $frame_size, 4), $id3v2_majorversion)) {

							// next frame is valid, just skip the current frame
							$framedata = substr($framedata, $frame_size);
							$ThisFileInfo['warning'][] = 'Next ID3v2 frame is valid, skipping current frame.';

						} else {

							// next frame is invalid too, abort processing
							//unset($framedata);
							$framedata = null;
							$ThisFileInfo['error'][] = 'Next ID3v2 frame is also invalid, aborting processing.';

						}

					} elseif ($frame_size == strlen($framedata)) {

						// this is the last frame, just skip
						$ThisFileInfo['warning'][] = 'This was the last ID3v2 frame.';

					} else {

						// next frame is invalid too, abort processing
						//unset($framedata);
						$framedata = null;
						$ThisFileInfo['warning'][] = 'Invalid ID3v2 frame size, aborting.';

					}
					if (!$this->IsValidID3v2FrameName($frame_name, $id3v2_majorversion)) {

						switch ($frame_name) {
							case "\x00\x00".'MP':
							case "\x00".'MP3':
							case ' MP3':
							case 'MP3e':
							case "\x00".'MP':
							case ' MP':
							case 'MP3':
								$ThisFileInfo['warning'][] = 'error parsing "'.$frame_name.'" ('.$framedataoffset.' bytes into the ID3v2.'.$id3v2_majorversion.' tag). (ERROR: !IsValidID3v2FrameName("'.str_replace("\x00", ' ', $frame_name).'", '.$id3v2_majorversion.'))). [Note: this particular error has been known to happen with tags edited by "MP3ext (www.mutschler.de/mp3ext/)"]';
								break;

							default:
								$ThisFileInfo['warning'][] = 'error parsing "'.$frame_name.'" ('.$framedataoffset.' bytes into the ID3v2.'.$id3v2_majorversion.' tag). (ERROR: !IsValidID3v2FrameName("'.str_replace("\x00", ' ', $frame_name).'", '.$id3v2_majorversion.'))).';
								break;
						}

					} elseif ($frame_size > strlen($framedata)){

						$ThisFileInfo['error'][] = 'error parsing "'.$frame_name.'" ('.$framedataoffset.' bytes into the ID3v2.'.$id3v2_majorversion.' tag). (ERROR: $frame_size ('.$frame_size.') > strlen($framedata) ('.strlen($framedata).')).';

					} else {

						$ThisFileInfo['error'][] = 'error parsing "'.$frame_name.'" ('.$framedataoffset.' bytes into the ID3v2.'.$id3v2_majorversion.' tag).';

					}

				}
				$framedataoffset += ($frame_size + $this->ID3v2HeaderLength($id3v2_majorversion));

			}

		}


	//    Footer

	//    The footer is a copy of the header, but with a different identifier.
	//        ID3v2 identifier           "3DI"
	//        ID3v2 version              $04 00
	//        ID3v2 flags                %abcd0000
	//        ID3v2 size             4 * %0xxxxxxx

		if (isset($thisfile_id3v2_flags['isfooter']) && $thisfile_id3v2_flags['isfooter']) {
			$footer = fread($fd, 10);
			if (substr($footer, 0, 3) == '3DI') {
				$thisfile_id3v2['footer'] = true;
				$thisfile_id3v2['majorversion_footer'] = ord($footer{3});
				$thisfile_id3v2['minorversion_footer'] = ord($footer{4});
			}
			if ($thisfile_id3v2['majorversion_footer'] <= 4) {
				$id3_flags = ord(substr($footer{5}));
				$thisfile_id3v2_flags['unsynch_footer']  = (bool) ($id3_flags & 0x80);
				$thisfile_id3v2_flags['extfoot_footer']  = (bool) ($id3_flags & 0x40);
				$thisfile_id3v2_flags['experim_footer']  = (bool) ($id3_flags & 0x20);
				$thisfile_id3v2_flags['isfooter_footer'] = (bool) ($id3_flags & 0x10);

				$thisfile_id3v2['footerlength'] = getid3_lib::BigEndian2Int(substr($footer, 6, 4), 1);
			}
		} // end footer

		if (isset($thisfile_id3v2['comments']['genre'])) {
			foreach ($thisfile_id3v2['comments']['genre'] as $key => $value) {
				unset($thisfile_id3v2['comments']['genre'][$key]);
				$thisfile_id3v2['comments'] = getid3_lib::array_merge_noclobber($thisfile_id3v2['comments'], $this->ParseID3v2GenreString($value));
			}
		}

		if (isset($thisfile_id3v2['comments']['track'])) {
			foreach ($thisfile_id3v2['comments']['track'] as $key => $value) {
				if (strstr($value, '/')) {
					list($thisfile_id3v2['comments']['tracknum'][$key], $thisfile_id3v2['comments']['totaltracks'][$key]) = explode('/', $thisfile_id3v2['comments']['track'][$key]);
				}
			}
		}

		if (!isset($thisfile_id3v2['comments']['year']) && ereg('^([0-9]{4})', trim(@$thisfile_id3v2['comments']['recording_time'][0]), $matches)) {
			$thisfile_id3v2['comments']['year'] = array($matches[1]);
		}


		// Set avdataoffset
		$ThisFileInfo['avdataoffset'] = $thisfile_id3v2['headerlength'];
		if (isset($thisfile_id3v2['footer'])) {
			$ThisFileInfo['avdataoffset'] += 10;
		}

		return true;
	}


	function ParseID3v2GenreString($genrestring) {
		// Parse genres into arrays of genreName and genreID
		// ID3v2.2.x, ID3v2.3.x: '(21)' or '(4)Eurodisco' or '(51)(39)' or '(55)((I think...)'
		// ID3v2.4.x: '21' $00 'Eurodisco' $00

		$genrestring = trim($genrestring);
		$returnarray = array();
		if (strpos($genrestring, "\x00") !== false) {
			$unprocessed = trim($genrestring); // trailing nulls will cause an infinite loop.
			$genrestring = '';
			while (strpos($unprocessed, "\x00") !== false) {
				// convert null-seperated v2.4-format into v2.3 ()-seperated format
				$endpos = strpos($unprocessed, "\x00");
				$genrestring .= '('.substr($unprocessed, 0, $endpos).')';
				$unprocessed = substr($unprocessed, $endpos + 1);
			}
			unset($unprocessed);
		}
		if (getid3_id3v1::LookupGenreID($genrestring)) {

			$returnarray['genre'][] = $genrestring;

		} else {

			while (strpos($genrestring, '(') !== false) {

				$startpos = strpos($genrestring, '(');
				$endpos   = strpos($genrestring, ')');
				if (substr($genrestring, $startpos + 1, 1) == '(') {
					$genrestring = substr($genrestring, 0, $startpos).substr($genrestring, $startpos + 1);
					$endpos--;
				}
				$element     = substr($genrestring, $startpos + 1, $endpos - ($startpos + 1));
				$genrestring = substr($genrestring, 0, $startpos).substr($genrestring, $endpos + 1);
				if (getid3_id3v1::LookupGenreName($element)) { // $element is a valid genre id/abbreviation

					if (empty($returnarray['genre']) || !in_array(getid3_id3v1::LookupGenreName($element), $returnarray['genre'])) { // avoid duplicate entires
						$returnarray['genre'][] = getid3_id3v1::LookupGenreName($element);
					}

				} else {

					if (empty($returnarray['genre']) || !in_array($element, $returnarray['genre'])) { // avoid duplicate entires
						$returnarray['genre'][] = $element;
					}

				}
			}
		}
		if ($genrestring) {
			if (empty($returnarray['genre']) || !in_array($genrestring, $returnarray['genre'])) { // avoid duplicate entires
				$returnarray['genre'][]   = $genrestring;
			}
		}

		return $returnarray;
	}


	function ParseID3v2Frame(&$parsedFrame, &$ThisFileInfo) {

		// shortcuts
		$id3v2_majorversion = $ThisFileInfo['id3v2']['majorversion'];

		$parsedFrame['framenamelong']  = $this->FrameNameLongLookup($parsedFrame['frame_name']);
		if (empty($parsedFrame['framenamelong'])) {
			unset($parsedFrame['framenamelong']);
		}
		$parsedFrame['framenameshort'] = $this->FrameNameShortLookup($parsedFrame['frame_name']);
		if (empty($parsedFrame['framenameshort'])) {
			unset($parsedFrame['framenameshort']);
		}

		if ($id3v2_majorversion >= 3) { // frame flags are not part of the ID3v2.2 standard
			if ($id3v2_majorversion == 3) {
				//    Frame Header Flags
				//    %abc00000 %ijk00000
				$parsedFrame['flags']['TagAlterPreservation']  = (bool) ($parsedFrame['frame_flags_raw'] & 0x8000); // a - Tag alter preservation
				$parsedFrame['flags']['FileAlterPreservation'] = (bool) ($parsedFrame['frame_flags_raw'] & 0x4000); // b - File alter preservation
				$parsedFrame['flags']['ReadOnly']              = (bool) ($parsedFrame['frame_flags_raw'] & 0x2000); // c - Read only
				$parsedFrame['flags']['compression']           = (bool) ($parsedFrame['frame_flags_raw'] & 0x0080); // i - Compression
				$parsedFrame['flags']['Encryption']            = (bool) ($parsedFrame['frame_flags_raw'] & 0x0040); // j - Encryption
				$parsedFrame['flags']['GroupingIdentity']      = (bool) ($parsedFrame['frame_flags_raw'] & 0x0020); // k - Grouping identity

			} elseif ($id3v2_majorversion == 4) {
				//    Frame Header Flags
				//    %0abc0000 %0h00kmnp
				$parsedFrame['flags']['TagAlterPreservation']  = (bool) ($parsedFrame['frame_flags_raw'] & 0x4000); // a - Tag alter preservation
				$parsedFrame['flags']['FileAlterPreservation'] = (bool) ($parsedFrame['frame_flags_raw'] & 0x2000); // b - File alter preservation
				$parsedFrame['flags']['ReadOnly']              = (bool) ($parsedFrame['frame_flags_raw'] & 0x1000); // c - Read only
				$parsedFrame['flags']['GroupingIdentity']      = (bool) ($parsedFrame['frame_flags_raw'] & 0x0040); // h - Grouping identity
				$parsedFrame['flags']['compression']           = (bool) ($parsedFrame['frame_flags_raw'] & 0x0008); // k - Compression
				$parsedFrame['flags']['Encryption']            = (bool) ($parsedFrame['frame_flags_raw'] & 0x0004); // m - Encryption