library/adodb/session/adodb-compress-gzip.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('gzcompress')) {
  16         trigger_error('gzip functions are not available', E_USER_ERROR);
  17         return 0;
  18 }
  19
  20 /*
  21 */
  22 class ADODB_Compress_Gzip {
  23         /**
  24          */
  25         var $_level = null;
  26
  27         /**
  28          */
  29         var $_min_length = 1;
  30
  31         /**
  32          */
  33         function getLevel() {
  34                 return $this->_level;
  35         }
  36
  37         /**
  38          */
  39         function setLevel($level) {
  40                 assert('$level >= 0');
  41                 assert('$level <= 9');
  42                 $this->_level = (int) $level;
  43         }
  44
  45         /**
  46          */
  47         function getMinLength() {
  48                 return $this->_min_length;
  49         }
  50
  51         /**
  52          */
  53         function setMinLength($min_length) {
  54                 assert('$min_length >= 0');
  55                 $this->_min_length = (int) $min_length;
  56         }
  57
  58         /**
  59          */
  60         function ADODB_Compress_Gzip($level = null, $min_length = null) {
  61                 if (!is_null($level)) {
  62                         $this->setLevel($level);
  63                 }
  64
  65                 if (!is_null($min_length)) {
  66                         $this->setMinLength($min_length);
  67                 }
  68         }
  69
  70         /**
  71          */
  72         function write($data, $key) {
  73                 if (strlen($data) < $this->_min_length) {
  74                         return $data;
  75                 }
  76
  77                 if (!is_null($this->_level)) {
  78                         return gzcompress($data, $this->_level);
  79                 } else {
  80                         return gzcompress($data);
  81                 }
  82         }
  83
  84         /**
  85          */
  86         function read($data, $key) {
  87                 return $data ? gzuncompress($data) : $data;
  88         }
  89
  90 }
  91
  92 return 1;
  93
  94 ?>