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   1  <?php
   2  /**
   3   * 7z stream wrapper
   4   *
   5   * Copyright © 2005 Brion Vibber <[email protected]>
   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  /**
  28   * Stream wrapper around 7za filter program.
  29   * Required since we can't pass an open file resource to XMLReader->open()
  30   * which is used for the text prefetch.
  31   *
  32   * @ingroup Maintenance
  33   */
  34  class SevenZipStream {
  35      protected $stream;
  36  
  37  	private function stripPath( $path ) {
  38          $prefix = 'mediawiki.compress.7z://';
  39  
  40          return substr( $path, strlen( $prefix ) );
  41      }
  42  
  43  	function stream_open( $path, $mode, $options, &$opened_path ) {
  44          if ( $mode[0] == 'r' ) {
  45              $options = 'e -bd -so';
  46          } elseif ( $mode[0] == 'w' ) {
  47              $options = 'a -bd -si';
  48          } else {
  49              return false;
  50          }
  51          $arg = wfEscapeShellArg( $this->stripPath( $path ) );
  52          $command = "7za $options $arg";
  53          if ( !wfIsWindows() ) {
  54              // Suppress the stupid messages on stderr
  55              $command .= ' 2>/dev/null';
  56          }
  57          $this->stream = popen( $command, $mode[0] ); // popen() doesn't like two-letter modes
  58          return ( $this->stream !== false );
  59      }
  60  
  61  	function url_stat( $path, $flags ) {
  62          return stat( $this->stripPath( $path ) );
  63      }
  64  
  65      // This is all so lame; there should be a default class we can extend
  66  
  67  	function stream_close() {
  68          return fclose( $this->stream );
  69      }
  70  
  71  	function stream_flush() {
  72          return fflush( $this->stream );
  73      }
  74  
  75  	function stream_read( $count ) {
  76          return fread( $this->stream, $count );
  77      }
  78  
  79  	function stream_write( $data ) {
  80          return fwrite( $this->stream, $data );
  81      }
  82  
  83  	function stream_tell() {
  84          return ftell( $this->stream );
  85      }
  86  
  87  	function stream_eof() {
  88          return feof( $this->stream );
  89      }
  90  
  91  	function stream_seek( $offset, $whence ) {
  92          return fseek( $this->stream, $offset, $whence );
  93      }
  94  }
  95  
  96  stream_wrapper_register( 'mediawiki.compress.7z', 'SevenZipStream' );