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<?php
/**
* File contains the ezcArchiveGnuHeader 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
* @access private
*/
/**
* The ezcArchiveGnuHeader class represents the Tar Gnu header.
*
* ezcArchiveGnuHeader can read the header from an ezcArchiveBlockFile or ezcArchiveEntry.
*
* The values from the headers are directly accessible via the class properties, and allows
* reading and writing to specific header values.
*
* The entire header can be appended to an ezcArchiveBlockFile again or written to an ezcArchiveFileStructure.
* Information may get lost, though.
*
* The header is the {@link ezcArchiveUstarHeader} with the extension that the type can be set to "L" or "K".
* Respectively, long filename and long link. If the type is set to either "L" or "K", the next block contains the
* filename or link. The block thereafter repeats the original header but the type is then set to a digit.
* (No long filename or link).
*
* @package Archive
* @version 1.4.1
* @access private
*/
class ezcArchiveGnuHeader extends ezcArchiveUstarHeader
{
/**
* Creates and initializes a new header.
*
* If the ezcArchiveBlockFile $file is null then the header will be empty.
* When an ezcArchiveBlockFile is given, the block position should point to the header block.
* This header block will be read from the file and initialized in this class.
*
* @param ezcArchiveBlockFile $file
*/
public function __construct( ezcArchiveBlockFile $file = null )
{
if ( !is_null( $file ) )
{
// FIXME Assumed a while.. check the gnu tar source file.
// FIXME Check long links, really large files, etc.
$extensions = array();
do
{
parent::__construct( $file );
switch ( $this->type )
{
case "L":
$extensions["fileName"] = $this->readExtension( $file );
break;
case "K":
$extensions["linkName"] = $this->readExtension( $file );
break;
}
} while ( $this->type < '0' || $this->type > '9' );
parent::__construct( $file );
foreach ( $extensions as $key => $value )
{
switch ( $key )
{
case "fileName":
$this->fileName = $extensions["fileName"];
$this->filePrefix = "";
break;
case "linkName":
$this->linkName = $extensions["linkName"];
break;
}
}
}
}
/**
* Reads an extended set of data from the Block file and returns it as a string.
*
* Some filenames or link names do not fit in the Ustar header, and are therefor placed in a new block.
* This method read the block(s) and returns the data as a string.
*
* @param ezcArchiveBlockFile $file
* @return string
*/
protected function readExtension( ezcArchiveBlockFile $file )
{
$completeBlocks = ( int ) ( $this->fileSize / self::BLOCK_SIZE );
$rest = ( $this->fileSize % self::BLOCK_SIZE );
$data = "";
for ( $i = 0; $i < $completeBlocks; $i++ )
{
$data .= $file->next();
}
$data .= substr( $file->next(), 0, $rest );
$file->next();
return $data;
}
}
?>