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| 1 | <?php |
| 2 | /** |
| 3 | * 7z stream wrapper |
| 4 | * |
| 5 | * Copyright © 2005 Brooke Vibber <bvibber@wikimedia.org> |
| 6 | * https://www.mediawiki.org/ |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License along |
| 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
| 21 | * http://www.gnu.org/copyleft/gpl.html |
| 22 | * |
| 23 | * @file |
| 24 | * @ingroup Maintenance |
| 25 | */ |
| 26 | |
| 27 | use MediaWiki\Shell\Shell; |
| 28 | |
| 29 | /** |
| 30 | * Stream wrapper around 7za filter program. |
| 31 | * Required since we can't pass an open file resource to XMLReader->open() |
| 32 | * which is used for the text prefetch. |
| 33 | * |
| 34 | * @ingroup Maintenance |
| 35 | */ |
| 36 | class SevenZipStream { |
| 37 | /** @var resource|false */ |
| 38 | protected $stream; |
| 39 | |
| 40 | /** @var resource|null Must exists on stream wrapper class */ |
| 41 | public $context; |
| 42 | |
| 43 | public static function register() { |
| 44 | static $done = false; |
| 45 | if ( !$done ) { |
| 46 | $done = true; |
| 47 | stream_wrapper_register( 'mediawiki.compress.7z', self::class ); |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | private function stripPath( $path ) { |
| 52 | $prefix = 'mediawiki.compress.7z://'; |
| 53 | |
| 54 | return substr( $path, strlen( $prefix ) ); |
| 55 | } |
| 56 | |
| 57 | public function stream_open( $path, $mode, $options, &$opened_path ) { |
| 58 | if ( $mode[0] == 'r' ) { |
| 59 | $options = 'e -bd -so'; |
| 60 | } elseif ( $mode[0] == 'w' ) { |
| 61 | $options = 'a -bd -si'; |
| 62 | } else { |
| 63 | return false; |
| 64 | } |
| 65 | $arg = Shell::escape( $this->stripPath( $path ) ); |
| 66 | $command = "7za $options $arg"; |
| 67 | if ( !wfIsWindows() ) { |
| 68 | // Suppress the stupid messages on stderr |
| 69 | $command .= ' 2>/dev/null'; |
| 70 | } |
| 71 | // popen() doesn't like two-letter modes |
| 72 | $this->stream = popen( $command, $mode[0] ); |
| 73 | return ( $this->stream !== false ); |
| 74 | } |
| 75 | |
| 76 | public function url_stat( $path, $flags ) { |
| 77 | return stat( $this->stripPath( $path ) ); |
| 78 | } |
| 79 | |
| 80 | public function stream_close() { |
| 81 | return fclose( $this->stream ); |
| 82 | } |
| 83 | |
| 84 | public function stream_flush() { |
| 85 | return fflush( $this->stream ); |
| 86 | } |
| 87 | |
| 88 | public function stream_read( $count ) { |
| 89 | return fread( $this->stream, $count ); |
| 90 | } |
| 91 | |
| 92 | public function stream_write( $data ) { |
| 93 | return fwrite( $this->stream, $data ); |
| 94 | } |
| 95 | |
| 96 | public function stream_tell() { |
| 97 | return ftell( $this->stream ); |
| 98 | } |
| 99 | |
| 100 | public function stream_eof() { |
| 101 | return feof( $this->stream ); |
| 102 | } |
| 103 | |
| 104 | public function stream_seek( $offset, $whence ) { |
| 105 | return fseek( $this->stream, $offset, $whence ); |
| 106 | } |
| 107 | } |