maintenance/7zip.inc

   1 <?php
   2 /**
   3  * Stream wrapper around 7za filter program.
   4  * Required since we can't pass an open file resource to XMLReader->open()
   5  * which is used for the text prefetch.
   6  *
   7  * @ingroup Maintenance
   8  */
   9 class SevenZipStream {
  10         var $stream;
  11
  12         private function stripPath( $path ) {
  13                 $prefix = 'mediawiki.compress.7z://';
  14                 return substr( $path, strlen( $prefix ) );
  15         }
  16
  17         function stream_open( $path, $mode, $options, &$opened_path ) {
  18                 if( $mode[0] == 'r' ) {
  19                         $options = 'e -bd -so';
  20                 } elseif( $mode[0] == 'w' ) {
  21                         $options = 'a -bd -si';
  22                 } else {
  23                         return false;
  24                 }
  25                 $arg = wfEscapeShellArg( $this->stripPath( $path ) );
  26                 $command = "7za $options $arg";
  27                 if( !wfIsWindows() ) {
  28                         // Suppress the stupid messages on stderr
  29                         $command .= ' 2>/dev/null';
  30                 }
  31                 $this->stream = popen( $command, $mode );
  32                 return ($this->stream !== false);
  33         }
  34
  35         function url_stat( $path, $flags ) {
  36                 return stat( $this->stripPath( $path ) );
  37         }
  38
  39         // This is all so lame; there should be a default class we can extend
  40
  41         function stream_close() {
  42                 return fclose( $this->stream );
  43         }
  44
  45         function stream_flush() {
  46                 return fflush( $this->stream );
  47         }
  48
  49         function stream_read( $count ) {
  50                 return fread( $this->stream, $count );
  51         }
  52
  53         function stream_write( $data ) {
  54                 return fwrite( $this->stream, $data );
  55         }
  56
  57         function stream_tell() {
  58                 return ftell( $this->stream );
  59         }
  60
  61         function stream_eof() {
  62                 return feof( $this->stream );
  63         }
  64
  65         function stream_seek( $offset, $whence ) {
  66                 return fseek( $this->stream, $offset, $whence );
  67         }
  68 }
  69 stream_wrapper_register( 'mediawiki.compress.7z', 'SevenZipStream' );