maintenance/7zip.inc

   1 <?php
   2 /**
   3  * 7z stream wrapper
   4  *
   5  * @file
   6  * @ingroup Maintenance
   7  */
   8
   9 /**
  10  * Stream wrapper around 7za filter program.
  11  * Required since we can't pass an open file resource to XMLReader->open()
  12  * which is used for the text prefetch.
  13  *
  14  * @ingroup Maintenance
  15  */
  16 class SevenZipStream {
  17         var $stream;
  18
  19         private function stripPath( $path ) {
  20                 $prefix = 'mediawiki.compress.7z://';
  21                 return substr( $path, strlen( $prefix ) );
  22         }
  23
  24         function stream_open( $path, $mode, $options, &$opened_path ) {
  25                 if ( $mode[0] == 'r' ) {
  26                         $options = 'e -bd -so';
  27                 } elseif ( $mode[0] == 'w' ) {
  28                         $options = 'a -bd -si';
  29                 } else {
  30                         return false;
  31                 }
  32                 $arg = wfEscapeShellArg( $this->stripPath( $path ) );
  33                 $command = "7za $options $arg";
  34                 if ( !wfIsWindows() ) {
  35                         // Suppress the stupid messages on stderr
  36                         $command .= ' 2>/dev/null';
  37                 }
  38                 $this->stream = popen( $command, $mode );
  39                 return ( $this->stream !== false );
  40         }
  41
  42         function url_stat( $path, $flags ) {
  43                 return stat( $this->stripPath( $path ) );
  44         }
  45
  46         // This is all so lame; there should be a default class we can extend
  47
  48         function stream_close() {
  49                 return fclose( $this->stream );
  50         }
  51
  52         function stream_flush() {
  53                 return fflush( $this->stream );
  54         }
  55
  56         function stream_read( $count ) {
  57                 return fread( $this->stream, $count );
  58         }
  59
  60         function stream_write( $data ) {
  61                 return fwrite( $this->stream, $data );
  62         }
  63
  64         function stream_tell() {
  65                 return ftell( $this->stream );
  66         }
  67
  68         function stream_eof() {
  69                 return feof( $this->stream );
  70         }
  71
  72         function stream_seek( $offset, $whence ) {
  73                 return fseek( $this->stream, $offset, $whence );
  74         }
  75 }
  76 stream_wrapper_register( 'mediawiki.compress.7z', 'SevenZipStream' );