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<?php |
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/** |
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* This file is part of the Metadata package. |
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* |
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* @author Daniel Schröder <[email protected]> |
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*/ |
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namespace GravityMedia\Metadata\ID3v1; |
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use GravityMedia\Stream\Stream; |
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/** |
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* ID3v1 metadata class. |
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* |
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* @package GravityMedia\Metadata\ID3v1 |
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*/ |
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class Metadata |
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{ |
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/** |
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* @var Stream |
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*/ |
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protected $stream; |
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/** |
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* @var Filter |
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*/ |
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protected $filter; |
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/** |
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* Create ID3v1 metadata object. |
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* |
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* @param Stream $stream |
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*/ |
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public function __construct(Stream $stream) |
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{ |
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$this->stream = $stream; |
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$this->filter = new Filter(); |
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} |
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/** |
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* Returns whether ID3v1 metadata exists. |
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* |
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* @return bool |
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*/ |
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View Code Duplication |
public function exists() |
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{ |
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if ($this->stream->getSize() < 128) { |
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return false; |
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} |
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$this->stream->seek(-128, SEEK_END); |
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return 'TAG' === $this->stream->read(3); |
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} |
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/** |
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* Strip ID3v1 metadata. |
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* |
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* @return $this |
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*/ |
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public function strip() |
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{ |
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if (!$this->exists()) { |
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return $this; |
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} |
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$this->stream->seek(0); |
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$this->stream->truncate($this->stream->getSize() - 128); |
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return $this; |
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} |
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/** |
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* Read ID3v1 tag version. |
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* |
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* @return int |
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*/ |
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protected function readVersion() |
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{ |
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$this->stream->seek(-3, SEEK_END); |
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if ("\x00" === $this->stream->read(1) && "\x00" !== $this->stream->read(1)) { |
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return Version::VERSION_11; |
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} |
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return Version::VERSION_10; |
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} |
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/** |
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* Read ID3v1 tag. |
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* |
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* @return null|Tag |
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*/ |
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public function read() |
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{ |
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if (!$this->exists()) { |
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return null; |
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} |
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$version = $this->readVersion(); |
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$tag = new Tag($version); |
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$this->stream->seek(-125, SEEK_END); |
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$tag->setTitle($this->filter->decode($this->stream->read(30))); |
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$tag->setArtist($this->filter->decode($this->stream->read(30))); |
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$tag->setAlbum($this->filter->decode($this->stream->read(30))); |
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$tag->setYear($this->filter->decode($this->stream->read(4))); |
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if (Version::VERSION_11 === $version) { |
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$tag->setComment($this->filter->decode($this->stream->read(28))); |
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$this->stream->seek(1, SEEK_CUR); |
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$tag->setTrack($this->stream->readUInt8()); |
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} else { |
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$tag->setComment($this->filter->decode($this->stream->read(30))); |
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} |
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$genre = $this->stream->readUInt8(); |
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if (in_array($genre, Genre::values())) { |
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$tag->setGenre($genre); |
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} |
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return $tag; |
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} |
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/** |
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* Write ID3v1 tag. |
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* |
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* @param Tag $tag The tag to write. |
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* |
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* @return $this |
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*/ |
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public function write(Tag $tag) |
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{ |
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$offset = 0; |
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if ($this->exists()) { |
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$offset = -128; |
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} |
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$this->stream->seek($offset, SEEK_END); |
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$data = 'TAG'; |
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$data .= $this->filter->encode($tag->getTitle(), 30); |
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$data .= $this->filter->encode($tag->getArtist(), 30); |
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$data .= $this->filter->encode($tag->getAlbum(), 30); |
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$data .= $this->filter->encode($tag->getYear(), 4); |
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if (Version::VERSION_11 === $tag->getVersion()) { |
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$data .= $this->filter->encode($tag->getComment(), 28); |
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$data .= "\x00"; |
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$data .= $this->stream->writeUInt8($tag->getTrack()); |
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} else { |
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$data .= $this->filter->encode($tag->getComment(), 30); |
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} |
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$data .= $this->stream->writeUInt8($tag->getGenre()); |
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$this->stream->write($data); |
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return $this; |
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} |
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} |
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GravityMedia /
Metadata
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.