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<?php
/**
* File containing the abstract ezcArchiveFileType 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
*/
/**
* This class provides methods to detect various archive or compression types.
*
* The archive formats that can be detected are:
* - tar ( v7, ustar, pax, gnu )
* - zip
*
* The compression types that can be detected are:
* - gzip
* - bzip2
*
* @package Archive
* @version 1.4.1
* @access private
*/
class ezcArchiveFileType
{
/**
* Returns the archive type of the given file.
*
* @param string $fileName Absolute or relative path to the file.
*
* @return int Possible values are: {@link ezcArchive::ZIP},
* {@link ezcArchive::TAR}, {@link ezcArchive::TAR_V7}, {@link ezcArchive::TAR_USTAR},
* {@link ezcArchive::TAR_PAX}, {@link ezcArchive::TAR_GNU}.
*/
public static function detect( $fileName )
{
$fp = fopen( $fileName, "r" );
if ( $fp === false )
{
return false;
}
$data = fread( $fp, 512 );
fclose( $fp );
if ( self::isGzip( $data ) )
{
return ezcArchive::GZIP;
}
if ( self::isBzip2( $data ) )
{
return ezcArchive::BZIP2;
}
if ( self::isZip( $data ) )
{
return ezcArchive::ZIP;
}
// Order is important.
if ( self::isPaxTar( $data ) )
{
return ezcArchive::TAR_PAX;
}
if ( self::isV7Tar( $data ) )
{
return ezcArchive::TAR_V7;
}
if ( self::isUstarTar( $data ) )
{
return ezcArchive::TAR_USTAR;
}
if ( self::isGnuTar( $data ) )
{
return ezcArchive::TAR_GNU;
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a Bzip2 archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isBzip2( $data )
{
if ( ord( $data[0] ) == 0x42 && ord( $data[1] ) == 0x5a )
{
return true;
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a Gzip archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isGzip( $data )
{
$h = unpack( "Cid1/Cid2", $data[0] . $data[1] );
if ( $h["id1"] == 0x1f && $h["id2"] == 0x8b )
{
return true;
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a Zip archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isZip( $data )
{
if ( $data[0] . $data[1] == pack( "v", 0x4b50 ) )
{
return true;
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a V7 tar archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isV7Tar( $data )
{
if ( strcmp( substr( $data, 257, 5 ), "\0\0\0\0\0" ) == 0 && strcmp( substr( $data, 263, 2 ), "\0\0" ) == 0 )
{
if ( self::tarContainsFileName( $data ) )
{
return true;
}
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a USTar archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isUstarTar( $data )
{
if ( strcmp( substr( $data, 257, 5 ), "ustar" ) == 0 && strcmp( substr( $data, 263, 2 ), "00" ) == 0 )
{
if ( self::tarContainsFileName( $data ) )
{
return true;
}
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a PAX tar archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isPaxTar( $data )
{
if ( strcmp( substr( $data, 257, 5 ), "ustar" ) == 0 && strcmp( substr( $data, 263, 2 ), "00" ) == 0 )
{
$type = substr( $data, 156, 1 );
if ( $type == "x" || $type == "g" )
{
if ( self::tarContainsFileName( $data ) )
{
return true;
}
}
}
return false;
}
/**
* Checks if the provided $data matches the known signature of a GNU tar archive.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function isGnuTar( $data )
{
if ( strcmp( substr( $data, 257, 5 ), "ustar" ) == 0 && strcmp( substr( $data, 263, 2 ), " \0" ) == 0 )
{
if ( self::tarContainsFileName( $data ) )
{
return true;
}
}
return false;
}
/**
* Checks if the provided $data contains a file name.
*
* The $data string parameter must contain the first block of data from a file. It will be
* matched against the known signature for this archive type.
*
* @param string $data
* @return bool
*/
public static function tarContainsFileName( $data )
{
return $data[0] != "\0";
}
}
?>