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<?php |
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namespace CHMLib\Header; |
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use Exception; |
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use CHMLib\Reader\Reader; |
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use CHMLib\Exception\UnexpectedHeaderException; |
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/** |
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* A PMGL (directory listing) header of a CHM file. |
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*/ |
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class PMGL extends Header |
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{ |
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/** |
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* The length of the free space and/or the QuickRef area at the end of the directory chunk. |
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* |
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* @var int |
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*/ |
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protected $freeSpace; |
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/** |
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* The chunk number of the previous listing chunk when reading directory in sequence (-1 if this is the first listing chunk). |
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* |
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* @var int |
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*/ |
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protected $previousChunk; |
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/** |
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* The chunk number of the next listing chunk when reading directory in sequence (-1 if this is the last listing chunk). |
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* |
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* @var int |
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*/ |
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protected $nextChunk; |
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/** |
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* Initializes the instance. |
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* |
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* @param \CHMLib\Reader\Reader $reader The reader that provides the data. |
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* |
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* @throws \CHMLib\Exception\UnexpectedHeaderException Throws an UnexpectedHeaderException if the header signature is not valid. |
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* @throws \Exception Throws an Exception in case of errors. |
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*/ |
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public function __construct(Reader $reader) |
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{ |
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parent::__construct($reader); |
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if ($this->headerSignature !== 'PMGL') { |
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throw UnexpectedHeaderException::create('PMGL', $this->headerSignature); |
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} |
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$this->freeSpace = $reader->readUInt32(); |
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/* Unknown (0) */ $reader->readUInt32(); |
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$this->previousChunk = $reader->readInt32(); |
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$this->nextChunk = $reader->readInt32(); |
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} |
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/** |
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* Get the length of the free space and/or the QuickRef area at the end of the directory chunk. |
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* |
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* @return int |
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*/ |
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public function getFreeSpace() |
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{ |
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return $this->freeSpace; |
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} |
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/** |
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* Get the chunk number of the previous listing chunk when reading directory in sequence (-1 if this is the first listing chunk). |
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* |
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* @return int |
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*/ |
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public function getPreviousChunk() |
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{ |
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return $this->previousChunk; |
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} |
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/** |
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* Get the chunk number of the next listing chunk when reading directory in sequence (-1 if this is the last listing chunk). |
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* |
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* @return int |
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*/ |
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public function getNextChunk() |
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{ |
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return $this->nextChunk; |
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} |
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} |
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mlocati /
chm-lib
