| <?php |
| /** |
| * File containing the abstract ezcArchiveFileType class. |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| * @package Archive |
| * @version //autogentag// |
| * @license http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0 |
| * @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 //autogentag// |
| * @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"; |
| } |
| } |
| ?> |