includes/HistoryBlob.php

   1 <?php
   2 /**
   3  *
   4  */
   5
   6 /**
   7  * Pure virtual parent
   8  */
   9 class HistoryBlob
  10 {
  11         function setMeta() {}
  12         function getMeta() {}
  13         function addItem() {}
  14         function getItem() {}
  15 }
  16
  17 /**
  18  * The real object
  19  */
  20 class ConcatenatedGzipHistoryBlob
  21 {
  22         /* private */ var $mVersion = 0, $mCompressed = false, $mItems = array();
  23
  24         function HistoryBlob() {
  25                 if ( !function_exists( 'gzdeflate' ) ) {
  26                         die( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
  27                 }
  28         }
  29
  30         function setMeta( $metaData ) {
  31                 $this->uncompress();
  32                 $this->mItems['meta'] = $metaData;
  33         }
  34
  35         function getMeta() {
  36                 $this->uncompress();
  37                 return $this->mItems['meta'];
  38         }
  39
  40         function addItem( $text ) {
  41                 $this->uncompress();
  42                 $this->mItems[md5($text)] = $text;
  43         }
  44
  45         function getItem( $hash ) {
  46                 $this->compress();
  47                 return $this->mItems[$hash];
  48         }
  49
  50         function compress() {
  51                 if ( !$this->mCompressed  ) {
  52                         $this->mItems = gzdeflate( serialize( $this->mItems ) );
  53                         $this->mCompressed = true;
  54                 }
  55         }
  56
  57         function uncompress() {
  58                 if ( $this->mCompressed ) {
  59                         $this->mItems = unserialize( gzinflate( $this->mItems ) );
  60                 }
  61         }
  62
  63         function __sleep() {
  64                 compress();
  65         }
  66
  67         function __wakeup() {
  68                 uncompress();
  69         }
  70 }
  71 ?>