/**
* Initializes the instance.
*
* @param Reader $reader The reader that provides the data.
*
* @throws Exception Throws an Exception in case of errors.
*/
public function __construct(Reader $reader)
{
$this->reader = $reader;
$reader->setPosition(0);
$this->itsf = new Header\ITSF($reader);
if ($this->itsf->getSectionOffset() >= 0 && $this->itsf->getSectionLength() >= 16) {
$reader->setPosition($this->itsf->getSectionOffset());
/* Unknown (510) */
$reader->readUInt32();
/* Unknown (0) */
$reader->readUInt32();
$totalLength = $reader->readUInt64();
if ($totalLength !== $reader->getLength()) {
throw new Exception("Invalid CHM size: expected length {$totalLength}, current length {$reader->getLength()}");
}
}
$reader->setPosition($this->itsf->getDirectoryOffset());
$this->itsp = new Header\ITSP($reader);
$expectedDirectoryLength = $this->itsf->getDirectoryLength();
$calculatedDirectoryLength = $this->itsp->getHeaderLength() + $this->itsp->getNumberOfDirectoryChunks() * $this->itsp->getDirectoryChunkSize();
if ($expectedDirectoryLength !== $calculatedDirectoryLength) {
throw new Exception("Unexpected directory list size (expected: {$expectedDirectoryLength}, calculated: {$calculatedDirectoryLength})");
}
$this->sections = array();
$this->sections[0] = new Section\UncompressedSection($this);
$this->entries = $this->retrieveEntryList();
$this->retrieveSectionList();
$this->toc = null;
$this->index = null;
}
/**
* Initializes the instance.
*
* @param Reader $reader The reader that provides the data.
*
* @throws UnexpectedHeaderException Throws an UnexpectedHeaderException if the header signature is not valid.
* @throws Exception Throws an Exception in case of errors.
*/
public function __construct(Reader $reader)
{
$size = $reader->readUInt32();
if ($size < 6) {
throw new Exception('The LZXC entry is too small');
}
parent::__construct($reader);
if ($this->headerSignature !== 'LZXC') {
throw UnexpectedHeaderException::create('LZXC', $this->headerSignature);
}
$this->version = $reader->readUInt32();
if ($this->version !== 2) {
throw new Exception("Unsupported LZXC header version: {$this->version}");
}
$this->resetInterval = $reader->readUInt32();
$this->windowSize = $reader->readUInt32();
$this->cacheSize = $reader->readUInt32();
}