1 | <?php |
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2 | // +----------------------------------------------------------------------+ |
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3 | // | PHP version 5 | |
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4 | // +----------------------------------------------------------------------+ |
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5 | // | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, | |
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6 | // | Stig. S. Bakken, Lukas Smith | |
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7 | // | All rights reserved. | |
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8 | // +----------------------------------------------------------------------+ |
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9 | // | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB | |
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10 | // | API as well as database abstraction for PHP applications. | |
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11 | // | This LICENSE is in the BSD license style. | |
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12 | // | | |
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13 | // | Redistribution and use in source and binary forms, with or without | |
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14 | // | modification, are permitted provided that the following conditions | |
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15 | // | are met: | |
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16 | // | | |
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17 | // | Redistributions of source code must retain the above copyright | |
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18 | // | notice, this list of conditions and the following disclaimer. | |
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19 | // | | |
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20 | // | Redistributions in binary form must reproduce the above copyright | |
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21 | // | notice, this list of conditions and the following disclaimer in the | |
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22 | // | documentation and/or other materials provided with the distribution. | |
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23 | // | | |
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24 | // | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, | |
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25 | // | Lukas Smith nor the names of his contributors may be used to endorse | |
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26 | // | or promote products derived from this software without specific prior| |
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27 | // | written permission. | |
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28 | // | | |
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29 | // | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
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30 | // | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
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31 | // | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
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32 | // | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
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33 | // | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | |
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34 | // | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | |
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35 | // | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS| |
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36 | // | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | |
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37 | // | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
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38 | // | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY| |
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39 | // | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
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40 | // | POSSIBILITY OF SUCH DAMAGE. | |
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41 | // +----------------------------------------------------------------------+ |
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42 | // | Author: Lukas Smith <smith@pooteeweet.org> | |
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43 | // +----------------------------------------------------------------------+ |
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44 | // |
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45 | // $Id$ |
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46 | |
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47 | /** |
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48 | * @package MDB2 |
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49 | * @category Database |
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50 | * @author Lukas Smith <smith@pooteeweet.org> |
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51 | */ |
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52 | |
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53 | require_once 'MDB2.php'; |
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54 | |
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55 | /** |
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56 | * MDB2_LOB: user land stream wrapper implementation for LOB support |
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57 | * |
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58 | * @package MDB2 |
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59 | * @category Database |
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60 | * @author Lukas Smith <smith@pooteeweet.org> |
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61 | */ |
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62 | class MDB2_LOB |
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63 | { |
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64 | /** |
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65 | * contains the key to the global MDB2 instance array of the associated |
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66 | * MDB2 instance |
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67 | * |
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68 | * @var integer |
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69 | * @access protected |
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70 | */ |
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71 | var $db_index; |
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72 | |
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73 | /** |
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74 | * contains the key to the global MDB2_LOB instance array of the associated |
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75 | * MDB2_LOB instance |
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76 | * |
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77 | * @var integer |
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78 | * @access protected |
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79 | */ |
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80 | var $lob_index; |
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81 | |
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82 | // {{{ stream_open() |
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83 | |
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84 | /** |
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85 | * open stream |
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86 | * |
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87 | * @param string specifies the URL that was passed to fopen() |
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88 | * @param string the mode used to open the file |
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89 | * @param int holds additional flags set by the streams API |
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90 | * @param string not used |
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91 | * |
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92 | * @return bool |
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93 | * @access public |
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94 | */ |
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95 | function stream_open($path, $mode, $options, &$opened_path) |
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96 | { |
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97 | if (!preg_match('/^rb?\+?$/', $mode)) { |
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98 | return false; |
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99 | } |
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100 | $url = parse_url($path); |
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101 | if (empty($url['host'])) { |
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102 | return false; |
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103 | } |
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104 | $this->db_index = (int)$url['host']; |
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105 | if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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106 | return false; |
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107 | } |
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108 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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109 | $this->lob_index = (int)$url['user']; |
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110 | if (!isset($db->datatype->lobs[$this->lob_index])) { |
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111 | return false; |
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112 | } |
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113 | return true; |
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114 | } |
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115 | // }}} |
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116 | |
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117 | // {{{ stream_read() |
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118 | |
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119 | /** |
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120 | * read stream |
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121 | * |
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122 | * @param int number of bytes to read |
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123 | * |
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124 | * @return string |
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125 | * @access public |
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126 | */ |
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127 | function stream_read($count) |
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128 | { |
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129 | if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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130 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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131 | $db->datatype->_retrieveLOB($db->datatype->lobs[$this->lob_index]); |
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132 | |
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133 | $data = $db->datatype->_readLOB($db->datatype->lobs[$this->lob_index], $count); |
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134 | $length = strlen($data); |
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135 | if ($length == 0) { |
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136 | $db->datatype->lobs[$this->lob_index]['endOfLOB'] = true; |
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137 | } |
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138 | $db->datatype->lobs[$this->lob_index]['position'] += $length; |
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139 | return $data; |
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140 | } |
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141 | } |
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142 | // }}} |
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143 | |
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144 | // {{{ stream_write() |
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145 | |
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146 | /** |
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147 | * write stream, note implemented |
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148 | * |
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149 | * @param string data |
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150 | * |
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151 | * @return int |
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152 | * @access public |
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153 | */ |
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154 | function stream_write($data) |
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155 | { |
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156 | return 0; |
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157 | } |
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158 | // }}} |
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159 | |
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160 | // {{{ stream_tell() |
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161 | |
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162 | /** |
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163 | * return the current position |
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164 | * |
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165 | * @return int current position |
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166 | * @access public |
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167 | */ |
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168 | function stream_tell() |
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169 | { |
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170 | if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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171 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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172 | return $db->datatype->lobs[$this->lob_index]['position']; |
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173 | } |
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174 | } |
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175 | // }}} |
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176 | |
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177 | // {{{ stream_eof() |
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178 | |
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179 | /** |
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180 | * Check if stream reaches EOF |
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181 | * |
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182 | * @return bool |
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183 | * @access public |
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184 | */ |
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185 | function stream_eof() |
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186 | { |
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187 | if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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188 | return true; |
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189 | } |
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190 | |
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191 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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192 | $result = $db->datatype->_endOfLOB($db->datatype->lobs[$this->lob_index]); |
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193 | if (version_compare(phpversion(), "5.0", ">=") |
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194 | && version_compare(phpversion(), "5.1", "<") |
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195 | ) { |
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196 | return !$result; |
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197 | } |
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198 | return $result; |
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199 | } |
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200 | // }}} |
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201 | |
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202 | // {{{ stream_seek() |
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203 | |
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204 | /** |
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205 | * Seek stream, not implemented |
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206 | * |
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207 | * @param int offset |
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208 | * @param int whence |
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209 | * |
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210 | * @return bool |
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211 | * @access public |
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212 | */ |
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213 | function stream_seek($offset, $whence) |
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214 | { |
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215 | return false; |
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216 | } |
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217 | // }}} |
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218 | |
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219 | // {{{ stream_stat() |
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220 | |
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221 | /** |
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222 | * return information about stream |
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223 | * |
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224 | * @access public |
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225 | */ |
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226 | function stream_stat() |
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227 | { |
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228 | if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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229 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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230 | return array( |
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231 | 'db_index' => $this->db_index, |
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232 | 'lob_index' => $this->lob_index, |
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233 | ); |
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234 | } |
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235 | } |
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236 | // }}} |
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237 | |
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238 | // {{{ stream_close() |
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239 | |
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240 | /** |
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241 | * close stream |
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242 | * |
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243 | * @access public |
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244 | */ |
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245 | function stream_close() |
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246 | { |
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247 | if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) { |
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248 | $db =& $GLOBALS['_MDB2_databases'][$this->db_index]; |
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249 | if (isset($db->datatype->lobs[$this->lob_index])) { |
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250 | $db->datatype->_destroyLOB($db->datatype->lobs[$this->lob_index]); |
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251 | unset($db->datatype->lobs[$this->lob_index]); |
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252 | } |
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253 | } |
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254 | } |
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255 | // }}} |
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256 | } |
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257 | |
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258 | // register streams wrapper |
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259 | if (!stream_wrapper_register("MDB2LOB", "MDB2_LOB")) { |
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260 | MDB2::raiseError(); |
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261 | return false; |
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262 | } |
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263 | |
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264 | ?> |
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