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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; |
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use GravityMedia\Metadata\ID3v2\Flag\ExtendedHeaderFlag; |
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use GravityMedia\Metadata\ID3v2\Restriction; |
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use GravityMedia\Metadata\ID3v2\Version; |
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/** |
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* ID3v2 extended header reader class. |
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* |
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* @package GravityMedia\Metadata\ID3v2\Reader |
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*/ |
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class ExtendedHeaderReader extends AbstractReader |
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{ |
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/** |
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* @var int |
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*/ |
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private $padding; |
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/** |
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* @var int |
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*/ |
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private $crc32; |
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/** |
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* @var int[] |
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*/ |
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private $restrictions; |
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/** |
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* Read ID3v2 extended header size. |
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* |
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* @return int |
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*/ |
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protected function readSize() |
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{ |
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$this->getStream()->seek($this->getOffset()); |
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$value = $this->getStream()->readUInt32(); |
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if (Version::VERSION_23 === $this->getVersion()) { |
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return $value; |
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} |
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return $this->getSynchsafeIntegerFilter()->decode($value); |
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} |
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/** |
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* Read ID3v2 extended header flags. |
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* |
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* @return bool[] |
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*/ |
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public function readFlags() |
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{ |
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if (Version::VERSION_23 === $this->getVersion()) { |
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$this->getStream()->seek($this->getOffset() + 4); |
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$flags = $this->getStream()->readUInt16(); |
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return [ |
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ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT => (bool)($flags & 0x8000) |
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]; |
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} |
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$this->getStream()->seek($this->getOffset() + 5); |
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$flags = $this->getStream()->readUInt8(); |
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return [ |
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ExtendedHeaderFlag::FLAG_TAG_IS_AN_UPDATE => (bool)($flags & 0x40), |
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ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT => (bool)($flags & 0x20), |
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ExtendedHeaderFlag::FLAG_TAG_RESTRICTIONS => (bool)($flags & 0x10) |
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]; |
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} |
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/** |
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* Read ID3v2 extended header padding. |
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* |
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* @return int |
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*/ |
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protected function readPadding() |
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{ |
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if (Version::VERSION_24 === $this->getVersion()) { |
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return 0; |
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} |
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$this->getStream()->seek($this->getOffset() + 6); |
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return $this->getStream()->readUInt32(); |
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} |
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/** |
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* Get ID3v2 extended header padding. |
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* |
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* @return int |
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*/ |
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public function getPadding() |
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{ |
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if (null === $this->padding) { |
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$this->padding = $this->readPadding(); |
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} |
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return $this->padding; |
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} |
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/** |
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* Read ID3v2 extended header CRC-32 data. |
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* |
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* @return int |
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*/ |
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protected function readCrc32() |
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{ |
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if (!$this->isFlagEnabled(ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT)) { |
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return 0; |
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} |
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View Code Duplication |
if (Version::VERSION_23 === $this->getVersion()) { |
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$this->getStream()->seek($this->getOffset() + 10); |
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return $this->getStream()->readUInt32(); |
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} |
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$offset = 7; |
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if ($this->isFlagEnabled(ExtendedHeaderFlag::FLAG_TAG_IS_AN_UPDATE)) { |
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$offset += 1; |
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} |
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$this->getStream()->seek($this->getOffset() + $offset); |
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return $this->getStream()->readUInt8() * 0x10000000 + |
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$this->getSynchsafeIntegerFilter()->decode($this->getStream()->readUInt32()); |
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} |
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/** |
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* Get ID3v2 extended header CRC-32 data. |
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* |
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* @return int |
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*/ |
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public function getCrc32() |
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{ |
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if (null === $this->crc32) { |
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$this->crc32 = $this->readCrc32(); |
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} |
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return $this->crc32; |
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} |
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/** |
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* Read ID3v2 extended header restrictions. |
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* |
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* @return int[] |
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*/ |
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protected function readRestrictions() |
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{ |
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if (!$this->isFlagEnabled(ExtendedHeaderFlag::FLAG_TAG_RESTRICTIONS)) { |
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return []; |
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} |
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$offset = 6; |
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if ($this->isFlagEnabled(ExtendedHeaderFlag::FLAG_TAG_IS_AN_UPDATE)) { |
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$offset += 1; |
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} |
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if ($this->isFlagEnabled(ExtendedHeaderFlag::FLAG_CRC_DATA_PRESENT)) { |
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$offset += 6; |
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} |
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$this->getStream()->seek($this->getOffset() + $offset); |
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$restrictions = $this->getStream()->readUInt8(); |
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return [ |
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Restriction::RESTRICTION_TAG_SIZE => ($restrictions & 0xc0) >> 6, |
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Restriction::RESTRICTION_TEXT_ENCODING => ($restrictions & 0x20) >> 5, |
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Restriction::RESTRICTION_TEXT_FIELDS_SIZE => ($restrictions & 0x18) >> 3, |
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Restriction::RESTRICTION_IMAGE_ENCODING => ($restrictions & 0x04) >> 2, |
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Restriction::RESTRICTION_IMAGE_SIZE => ($restrictions & 0x03) >> 0 |
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]; |
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} |
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/** |
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* Get ID3v2 extended header restrictions. |
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* |
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* @return int[] |
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*/ |
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public function getRestrictions() |
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{ |
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if (null === $this->restrictions) { |
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$this->restrictions = $this->readRestrictions(); |
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} |
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return $this->restrictions; |
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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.