[2] | 1 | <?php |
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| 2 | |
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| 3 | /* |
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[34] | 4 | V4.94 23 Jan 2007 (c) 2000-2007 John Lim (jlim#natsoft.com.my). All rights reserved. |
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[2] | 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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