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

   1 <?php
   2
   3 // $CVSHeader$
   4
   5 /*
   6 V4.01 23 Oct 2003  (c) 2000-2004 John Lim (jlim@natsoft.com.my). All rights reserved.
   7          Contributed by Ross Smith (adodb@netebb.com).
   8   Released under both BSD license and Lesser GPL library license.
   9   Whenever there is any discrepancy between the two licenses,
  10   the BSD license will take precedence.
  11           Set tabs to 4 for best viewing.
  12
  13 */
  14
  15 if (!function_exists('bzcompress')) {
  16         trigger_error('bzip2 functions are not available', E_USER_ERROR);
  17         return 0;
  18 }
  19
  20 /*
  21 */
  22 class ADODB_Compress_Bzip2 {
  23         /**
  24          */
  25         var $_block_size = null;
  26
  27         /**
  28          */
  29         var $_work_level = null;
  30
  31         /**
  32          */
  33         var $_min_length = 1;
  34
  35         /**
  36          */
  37         function getBlockSize() {
  38                 return $this->_block_size;
  39         }
  40
  41         /**
  42          */
  43         function setBlockSize($block_size) {
  44                 assert('$block_size >= 1');
  45                 assert('$block_size <= 9');
  46                 $this->_block_size = (int) $block_size;
  47         }
  48
  49         /**
  50          */
  51         function getWorkLevel() {
  52                 return $this->_work_level;
  53         }
  54
  55         /**
  56          */
  57         function setWorkLevel($work_level) {
  58                 assert('$work_level >= 0');
  59                 assert('$work_level <= 250');
  60                 $this->_work_level = (int) $work_level;
  61         }
  62
  63         /**
  64          */
  65         function getMinLength() {
  66                 return $this->_min_length;
  67         }
  68
  69         /**
  70          */
  71         function setMinLength($min_length) {
  72                 assert('$min_length >= 0');
  73                 $this->_min_length = (int) $min_length;
  74         }
  75
  76         /**
  77          */
  78         function ADODB_Compress_Bzip2($block_size = null, $work_level = null, $min_length = null) {
  79                 if (!is_null($block_size)) {
  80                         $this->setBlockSize($block_size);
  81                 }
  82
  83                 if (!is_null($work_level)) {
  84                         $this->setWorkLevel($work_level);
  85                 }
  86
  87                 if (!is_null($min_length)) {
  88                         $this->setMinLength($min_length);
  89                 }
  90         }
  91
  92         /**
  93          */
  94         function write($data, $key) {
  95                 if (strlen($data) < $this->_min_length) {
  96                         return $data;
  97                 }
  98
  99                 if (!is_null($this->_block_size)) {
 100                         if (!is_null($this->_work_level)) {
 101                                 return bzcompress($data, $this->_block_size, $this->_work_level);
 102                         } else {
 103                                 return bzcompress($data, $this->_block_size);
 104                         }
 105                 }
 106
 107                 return bzcompress($data);
 108         }
 109
 110         /**
 111          */
 112         function read($data, $key) {
 113                 return $data ? bzdecompress($data) : $data;
 114         }
 115
 116 }
 117
 118 return 1;
 119
 120 ?>