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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\ID3v2\Reader\Frame; |
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use GravityMedia\Metadata\ID3v2\Encoding; |
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use GravityMedia\Metadata\ID3v2\StreamContainer; |
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use GravityMedia\Stream\Stream; |
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/** |
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* ID3v2 text frame reader class. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Metadata\Frame |
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*/ |
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class TextFrameReader extends StreamContainer |
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{ |
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/** |
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* String representations of encodings. |
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* |
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* @var string[] |
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*/ |
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protected static $encodings = [ |
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Encoding::ISO_8859_1 => 'ISO-8859-1', |
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Encoding::UTF_8 => 'UTF-8', |
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Encoding::UTF_16 => 'UTF-16', |
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Encoding::UTF_16BE => 'UTF-16BE', |
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Encoding::UTF_16LE => 'UTF-16LE' |
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]; |
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/** |
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* @var int |
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*/ |
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private $textOffset; |
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/** |
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* @var int |
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*/ |
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private $encoding; |
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/** |
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* @var string[] |
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*/ |
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private $texts; |
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/** |
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* Create ID3v2 text frame reader object. |
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* |
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* @param Stream $stream |
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* @param int $textOffset |
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*/ |
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public function __construct(Stream $stream, $textOffset = 1) |
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{ |
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parent::__construct($stream); |
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$this->textOffset = $textOffset; |
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} |
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/** |
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* Read encoding. |
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* |
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* @return int |
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*/ |
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protected function readEncoding() |
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{ |
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$this->getStream()->seek($this->getOffset()); |
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return $this->getStream()->readUInt8(); |
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} |
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/** |
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* Get encoding. |
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* |
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* @return int |
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*/ |
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public function getEncoding() |
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{ |
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if (null === $this->encoding) { |
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$this->encoding = $this->readEncoding(); |
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} |
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return $this->encoding; |
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} |
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/** |
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* Read texts. |
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* |
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* @return string |
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*/ |
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protected function readTexts() |
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{ |
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$this->getStream()->seek($this->getOffset() + $this->textOffset); |
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$text = $this->getStream()->read($this->getStream()->getSize() - $this->textOffset); |
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$encoding = $this->getEncoding(); |
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if (isset(static::$encodings[$encoding])) { |
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$text = iconv(static::$encodings[$encoding], static::$encodings[Encoding::UTF_8], $text); |
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} |
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return explode("\x00", $text); |
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} |
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/** |
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* Get text. |
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* |
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* @param int $index |
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* |
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* @return null|string |
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*/ |
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public function getText($index = 0) |
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{ |
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if (null === $this->texts) { |
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$this->texts = $this->readTexts(); |
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} |
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if (!isset($this->texts[$index])) { |
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return null; |
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} |
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return $this->texts[$index]; |
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} |
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} |
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GravityMedia /
Metadata
