library/adodb/session/adodb-compress-bzip2.php

   1 <?php
   2
   3 /*
   4 V5.14 8 Sept 2011  (c) 2000-2011 John Lim (jlim#natsoft.com). All rights reserved.
   5          Contributed by Ross Smith (adodb@netebb.com).
   6   Released under both BSD license and Lesser GPL library license.
   7   Whenever there is any discrepancy between the two licenses,
   8   the BSD license will take precedence.
   9           Set tabs to 4 for best viewing.
  10
  11 */
  12
  13 if (!function_exists('bzcompress')) {
  14         trigger_error('bzip2 functions are not available', E_USER_ERROR);
  15         return 0;
  16 }
  17
  18 /*
  19 */
  20 class ADODB_Compress_Bzip2 {
  21         /**
  22          */
  23         var $_block_size = null;
  24
  25         /**
  26          */
  27         var $_work_level = null;
  28
  29         /**
  30          */
  31         var $_min_length = 1;
  32
  33         /**
  34          */
  35         function getBlockSize() {
  36                 return $this->_block_size;
  37         }
  38
  39         /**
  40          */
  41         function setBlockSize($block_size) {
  42                 assert('$block_size >= 1');
  43                 assert('$block_size <= 9');
  44                 $this->_block_size = (int) $block_size;
  45         }
  46
  47         /**
  48          */
  49         function getWorkLevel() {
  50                 return $this->_work_level;
  51         }
  52
  53         /**
  54          */
  55         function setWorkLevel($work_level) {
  56                 assert('$work_level >= 0');
  57                 assert('$work_level <= 250');
  58                 $this->_work_level = (int) $work_level;
  59         }
  60
  61         /**
  62          */
  63         function getMinLength() {
  64                 return $this->_min_length;
  65         }
  66
  67         /**
  68          */
  69         function setMinLength($min_length) {
  70                 assert('$min_length >= 0');
  71                 $this->_min_length = (int) $min_length;
  72         }
  73
  74         /**
  75          */
  76         function ADODB_Compress_Bzip2($block_size = null, $work_level = null, $min_length = null) {
  77                 if (!is_null($block_size)) {
  78                         $this->setBlockSize($block_size);
  79                 }
  80
  81                 if (!is_null($work_level)) {
  82                         $this->setWorkLevel($work_level);
  83                 }
  84
  85                 if (!is_null($min_length)) {
  86                         $this->setMinLength($min_length);
  87                 }
  88         }
  89
  90         /**
  91          */
  92         function write($data, $key) {
  93                 if (strlen($data) < $this->_min_length) {
  94                         return $data;
  95                 }
  96
  97                 if (!is_null($this->_block_size)) {
  98                         if (!is_null($this->_work_level)) {
  99                                 return bzcompress($data, $this->_block_size, $this->_work_level);
 100                         } else {
 101                                 return bzcompress($data, $this->_block_size);
 102                         }
 103                 }
 104
 105                 return bzcompress($data);
 106         }
 107
 108         /**
 109          */
 110         function read($data, $key) {
 111                 return $data ? bzdecompress($data) : $data;
 112         }
 113
 114 }
 115
 116 return 1;
 117
 118 ?>