1 | <?php |
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2 | |
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3 | /* |
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4 | V4.94 23 Jan 2007 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved. |
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5 | Contributed by Ross Smith (adodb@netebb.com). |
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6 | Released under both BSD license and Lesser GPL library license. |
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7 | Whenever there is any discrepancy between the two licenses, |
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8 | the BSD license will take precedence. |
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9 | Set tabs to 4 for best viewing. |
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10 | |
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11 | */ |
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12 | |
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13 | if (!function_exists('bzcompress')) { |
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14 | trigger_error('bzip2 functions are not available', E_USER_ERROR); |
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15 | return 0; |
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16 | } |
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17 | |
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18 | /* |
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19 | */ |
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20 | class ADODB_Compress_Bzip2 { |
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21 | /** |
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22 | */ |
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23 | var $_block_size = null; |
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24 | |
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25 | /** |
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26 | */ |
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27 | var $_work_level = null; |
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28 | |
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29 | /** |
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30 | */ |
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31 | var $_min_length = 1; |
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32 | |
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33 | /** |
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34 | */ |
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35 | function getBlockSize() { |
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36 | return $this->_block_size; |
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37 | } |
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38 | |
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39 | /** |
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40 | */ |
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41 | function setBlockSize($block_size) { |
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42 | assert('$block_size >= 1'); |
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43 | assert('$block_size <= 9'); |
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44 | $this->_block_size = (int) $block_size; |
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45 | } |
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46 | |
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47 | /** |
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48 | */ |
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49 | function getWorkLevel() { |
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50 | return $this->_work_level; |
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51 | } |
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52 | |
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53 | /** |
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54 | */ |
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55 | function setWorkLevel($work_level) { |
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56 | assert('$work_level >= 0'); |
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57 | assert('$work_level <= 250'); |
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58 | $this->_work_level = (int) $work_level; |
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59 | } |
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60 | |
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61 | /** |
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62 | */ |
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63 | function getMinLength() { |
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64 | return $this->_min_length; |
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65 | } |
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66 | |
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67 | /** |
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68 | */ |
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69 | function setMinLength($min_length) { |
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70 | assert('$min_length >= 0'); |
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71 | $this->_min_length = (int) $min_length; |
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72 | } |
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73 | |
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74 | /** |
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75 | */ |
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76 | function ADODB_Compress_Bzip2($block_size = null, $work_level = null, $min_length = null) { |
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77 | if (!is_null($block_size)) { |
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78 | $this->setBlockSize($block_size); |
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79 | } |
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80 | |
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81 | if (!is_null($work_level)) { |
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82 | $this->setWorkLevel($work_level); |
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83 | } |
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84 | |
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85 | if (!is_null($min_length)) { |
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86 | $this->setMinLength($min_length); |
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87 | } |
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88 | } |
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89 | |
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90 | /** |
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91 | */ |
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92 | function write($data, $key) { |
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93 | if (strlen($data) < $this->_min_length) { |
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94 | return $data; |
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95 | } |
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96 | |
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97 | if (!is_null($this->_block_size)) { |
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98 | if (!is_null($this->_work_level)) { |
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99 | return bzcompress($data, $this->_block_size, $this->_work_level); |
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100 | } else { |
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101 | return bzcompress($data, $this->_block_size); |
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102 | } |
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103 | } |
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104 | |
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105 | return bzcompress($data); |
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106 | } |
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107 | |
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108 | /** |
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109 | */ |
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110 | function read($data, $key) { |
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111 | return $data ? bzdecompress($data) : $data; |
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112 | } |
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113 | |
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114 | } |
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115 | |
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116 | return 1; |
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117 | |
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118 | ?> |
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