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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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* The LXZ header of a CHM file. |
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*/ |
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class LZXC extends Header |
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{ |
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/** |
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* The header version. |
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* |
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* @var int |
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*/ |
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protected $version; |
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/** |
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* The LZX reset interval. |
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* |
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* @var int |
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*/ |
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protected $resetInterval; |
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/** |
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* The window size in 32KB blocks. |
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* |
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* @var int |
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*/ |
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protected $windowSize; |
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/** |
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* The cache size. |
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* |
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* @var int |
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*/ |
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protected $cacheSize; |
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/** |
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* Initializes the instance. |
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* |
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* @param Reader $reader The reader that provides the data. |
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* |
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* @throws 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 $reader) |
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{ |
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$size = $reader->readUInt32(); |
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if ($size < 6) { |
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throw new Exception('The LZXC entry is too small'); |
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} |
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parent::__construct($reader); |
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if ($this->headerSignature !== 'LZXC') { |
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throw UnexpectedHeaderException::create('LZXC', $this->headerSignature); |
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} |
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$this->version = $reader->readUInt32(); |
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if ($this->version !== 2) { |
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throw new Exception("Unsupported LZXC header version: {$this->version}"); |
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} |
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$this->resetInterval = $reader->readUInt32(); |
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$this->windowSize = $reader->readUInt32(); |
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$this->cacheSize = $reader->readUInt32(); |
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} |
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/** |
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* Get the header version. |
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* |
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* @return int |
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*/ |
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public function getVersion() |
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{ |
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return $this->version; |
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} |
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/** |
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* Get the LZX reset interval. |
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* |
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* @return int |
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*/ |
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public function getResetInterval() |
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{ |
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return $this->resetInterval; |
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} |
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/** |
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* Get the window size in 32KB blocks. |
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* |
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* @return int |
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*/ |
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public function getWindowSize() |
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{ |
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return $this->windowSize; |
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} |
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/** |
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* Get the cache size. |
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* |
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* @return int |
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*/ |
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public function getCacheSize() |
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{ |
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return $this->cacheSize; |
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} |
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} |
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mlocati /
chm-lib
