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<?php |
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/** |
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* This file is part of the Metadata project. |
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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; |
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use GravityMedia\Metadata\ID3v2\StreamContainer; |
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/** |
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* ID3v2 picture frame reader class. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Reader |
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*/ |
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class PictureFrameReader extends StreamContainer |
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{ |
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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 $mimeType; |
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/** |
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* @var int |
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*/ |
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private $type; |
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/** |
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* @var string |
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*/ |
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private $description; |
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/** |
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* @var string |
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*/ |
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private $data; |
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/** |
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* Read encoding. |
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* |
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* @return int |
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*/ |
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protected function readEncoding() |
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{ |
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$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 $this->encoding; |
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} |
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/** |
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* Read mime type. |
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* |
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* @return string |
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*/ |
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protected function readMimeType() |
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{ |
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$this->getStream()->seek($this->getOffset() + 1); |
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$mimeType = ''; |
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while (!$this->getStream()->eof()) { |
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$char = $this->getStream()->read(1); |
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if ("\x00" === $char) { |
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break; |
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} |
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$mimeType .= $char; |
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} |
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return $mimeType; |
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} |
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/** |
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* Get mime type. |
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* |
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* @return string |
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*/ |
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public function getMimeType() |
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{ |
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if (null === $this->mimeType) { |
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$this->mimeType = $this->readMimeType(); |
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} |
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return $this->mimeType; |
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} |
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/** |
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* Get type. |
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* |
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* @return int |
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*/ |
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protected function readType() |
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{ |
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$offset = strlen($this->getMimeType()) + 2; |
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$this->getStream()->seek($this->getOffset() + $offset); |
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return $this->getStream()->readUInt8(); |
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} |
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/** |
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* Get type. |
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* |
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* @return int |
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*/ |
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public function getType() |
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{ |
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if (null === $this->type) { |
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$this->type = $this->readType(); |
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} |
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return $this->type; |
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} |
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/** |
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* Read description. |
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* |
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* @return string |
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*/ |
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protected function readDescription() |
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{ |
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$offset = strlen($this->getMimeType()) + 3; |
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$this->getStream()->seek($this->getOffset() + $offset); |
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$description = ''; |
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while (!$this->getStream()->eof()) { |
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$char = $this->getStream()->read(1); |
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if ("\x00" === $char) { |
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break; |
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} |
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$description .= $char; |
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} |
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return $description; |
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} |
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/** |
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* Get description. |
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* |
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* @return string |
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*/ |
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public function getDescription() |
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{ |
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if (null === $this->description) { |
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$this->description = $this->readDescription(); |
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} |
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return $this->description; |
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} |
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/** |
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* Read data. |
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* |
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* @return string |
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*/ |
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protected function readData() |
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{ |
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$offset = strlen($this->getMimeType()) + strlen($this->getDescription()) + 4; |
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$length = $this->getStream()->getSize() - $offset; |
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if ($length < 1) { |
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return ''; |
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} |
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$this->getStream()->seek($this->getOffset() + $offset); |
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return $this->getStream()->read($length); |
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} |
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/** |
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* Get data. |
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* |
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* @return string |
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*/ |
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public function getData() |
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{ |
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if (null === $this->data) { |
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$this->data = $this->readData(); |
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} |
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return $this->data; |
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} |
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} |
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GravityMedia /
Metadata
