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<?php |
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namespace CHMLib; |
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use Exception; |
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/** |
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* Represent an entry (file/directory) contained in a CHM file. |
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*/ |
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class Entry |
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{ |
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/** |
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* Entry type: directory. |
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* |
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* @var int |
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*/ |
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const TYPE_DIRECTORY = 0x1; |
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/** |
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* Entry type: normal file. |
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* |
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* @var int |
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*/ |
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const TYPE_FILE = 0x2; |
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/** |
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* Entry type: special file. |
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* |
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* @var int |
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*/ |
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const TYPE_SPECIAL_FILE = 0x4; |
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/** |
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* Entry type: meta data. |
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* |
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* @var int |
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*/ |
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const TYPE_METADATA = 0x8; |
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/** |
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* The parent CHM file. |
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* |
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* @var CHM |
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*/ |
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protected $chm; |
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/** |
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* The path of this entry. |
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* |
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* @var string |
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*/ |
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protected $path; |
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/** |
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* The index of the content section that contains the data of this entry. |
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* |
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* @var int |
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*/ |
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protected $contentSectionIndex; |
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/** |
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* The offset of the entry data from the beginning of the content section this entry is in, after the section has been decompressed (if appropriate). |
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* |
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* @var int |
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*/ |
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protected $offset; |
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/** |
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* The length of the entry data after decompression (if appropriate). |
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* |
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* @var int |
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*/ |
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protected $length; |
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/** |
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* The type of this entry (one of the static::TYPE_... constants). |
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* |
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* @var int |
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*/ |
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protected $type; |
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/** |
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* Initializes the instance. |
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* |
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* @param CHM $chm The parent CHM file. |
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*/ |
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public function __construct(CHM $chm) |
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{ |
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$reader = $chm->getReader(); |
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$this->chm = $chm; |
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$stringLength = $reader->readCompressedUInt32(); |
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$this->path = $reader->readString($stringLength); |
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$this->contentSectionIndex = $reader->readCompressedUInt32(); |
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$this->offset = $reader->readCompressedUInt32(); |
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$this->length = $reader->readCompressedUInt32(); |
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$pathLength = strlen($this->path); |
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if (substr($this->path, -1) === '/') { |
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$this->type = static::TYPE_DIRECTORY; |
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} elseif ($this->path[0] === '/') { |
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if ($pathLength > 1 && ($this->path[1] === '#' || $this->path[1] === '$')) { |
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$this->type = static::TYPE_SPECIAL_FILE; |
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} else { |
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$this->type = static::TYPE_FILE; |
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} |
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} else { |
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$this->type = static::TYPE_METADATA; |
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} |
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} |
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/** |
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* Get the path of this entry. |
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* |
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* @return string |
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*/ |
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public function getPath() |
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{ |
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return $this->path; |
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} |
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/** |
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* Get the index of the content section that contains the data of this entry. |
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* |
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* @return int |
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*/ |
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public function getContentSectionIndex() |
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{ |
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return $this->contentSectionIndex; |
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} |
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/** |
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* Get the offset from the beginning of the content section this entry is in, after the section has been decompressed (if appropriate). |
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* |
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* @return int |
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*/ |
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public function getOffset() |
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{ |
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return $this->offset; |
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} |
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/** |
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* Get the length of the entry data after decompression (if appropriate). |
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* |
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* @return int |
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*/ |
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public function getLength() |
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{ |
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return $this->length; |
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} |
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/** |
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* Is this a directory entry? |
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* |
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* @return bool |
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*/ |
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public function isDirectory() |
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{ |
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return (bool) ($this->type === static::TYPE_DIRECTORY); |
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} |
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/** |
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* Is this a normal file entry? |
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* |
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* @return bool |
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*/ |
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public function isFile() |
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{ |
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return (bool) ($this->type === static::TYPE_FILE); |
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} |
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/** |
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* Is this a special file entry? |
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* |
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* @return bool |
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*/ |
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public function isSpecialFile() |
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{ |
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return (bool) ($this->type === static::TYPE_SPECIAL_FILE); |
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} |
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/** |
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* Is this a meta-data entry? |
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* |
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* @return bool |
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*/ |
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public function isMetaData() |
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{ |
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return (bool) ($this->type === static::TYPE_METADATA); |
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} |
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/** |
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* Get the type of this entry (one of the static::TYPE_... constants). |
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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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return $this->type; |
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} |
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/** |
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* Get the contents of this entry. |
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* |
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* @return string |
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* |
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* @throws Exception Throws an Exception in case of errors. |
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*/ |
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public function getContents() |
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{ |
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$section = $this->chm->getSectionByIndex($this->contentSectionIndex); |
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if ($section === null) { |
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throw new Exception("The CHM file does not contain a data section with index {$this->contentSectionIndex}"); |
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} |
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return $section->getContents($this->offset, $this->length); |
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} |
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} |
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