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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"; } } ?>