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

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