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<?php
/**
* File containing the ezcArchiveUstarTar class.
*
* @package Archive
* @version 1.4.1
* @copyright Copyright (C) 2005-2010 eZ Systems AS. All rights reserved.
* @license http://ez.no/licenses/new_bsd New BSD License
*/
/**
* The ezcArchiveUstarTar class implements the Tar ustar archive format.
*
* ezcArchiveUstarTar is a subclass from {@link ezcArchive} that provides the common interface,
* and {@link ezcArchiveV7Tar} that provides the basic Tar implementation.
*
* ezcArchiveUstarTar reads on creation only the first {@link ezcArchiveEntry entry} from the archive.
* When needed next entries are read.
*
* The Ustar Tar algorithm is an extension of V7 Tar. Ustar has the following extended features:
* - Filenames up to 255 characters.
* - Stores the owner and group by ID and Name.
* - Can archive: regular files, symbolic links, hard links, fifo's, and devices.
*
* @package Archive
* @version 1.4.1
*/
class ezcArchiveUstarTar extends ezcArchiveV7Tar implements Iterator
{
/**
* Initializes the Tar and tries to read the first entry from the archive.
*
* At initialization it sets the blockFactor to $blockFactor. Each tar archive
* has always $blockFactor of blocks ( 0, $blockFactor, 2 * $blockFactor, etc ).
*
* The Tar archive works with blocks, so therefore the first parameter expects
* the archive as a blockFile.
*
* @param ezcArchiveBlockFile $blockFile
* @param int $blockFactor
*/
public function __construct( ezcArchiveBlockFile $blockFile, $blockFactor = 20 )
{
parent::__construct( $blockFile, $blockFactor );
}
/**
* Returns the value which specifies a TAR_USTAR algorithm.
*
* @return int
*/
public function getAlgorithm()
{
return self::TAR_USTAR;
}
/**
* Returns true because the TAR_USTAR algorithm can write.
*
* @see isWritable()
*
* @return bool
*/
public function algorithmCanWrite()
{
return true;
}
/**
* Creates the a new ustar tar header for this class.
*
* This method expects an {@link ezcArchiveBlockFile} that points to the header that should be
* read (and created). If null is given as block file, an empty header will be created.
*
* @param string|null $file
* @return ezcArchiveUstarHeader
*/
protected function createTarHeader( $file = null)
{
return new ezcArchiveUstarHeader( $file );
}
}
?>
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