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/gespac/config/PEAR/MDB2/LOB.php

http://gespac.googlecode.com/
PHP | 264 lines | 95 code | 24 blank | 145 comment | 15 complexity | bd83458d9b7a044cb44956244a584849 MD5 | raw file
  1<?php
  2// +----------------------------------------------------------------------+
  3// | PHP version 5                                                        |
  4// +----------------------------------------------------------------------+
  5// | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox,                 |
  6// | Stig. S. Bakken, Lukas Smith                                         |
  7// | All rights reserved.                                                 |
  8// +----------------------------------------------------------------------+
  9// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB  |
 10// | API as well as database abstraction for PHP applications.            |
 11// | This LICENSE is in the BSD license style.                            |
 12// |                                                                      |
 13// | Redistribution and use in source and binary forms, with or without   |
 14// | modification, are permitted provided that the following conditions   |
 15// | are met:                                                             |
 16// |                                                                      |
 17// | Redistributions of source code must retain the above copyright       |
 18// | notice, this list of conditions and the following disclaimer.        |
 19// |                                                                      |
 20// | Redistributions in binary form must reproduce the above copyright    |
 21// | notice, this list of conditions and the following disclaimer in the  |
 22// | documentation and/or other materials provided with the distribution. |
 23// |                                                                      |
 24// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken,    |
 25// | Lukas Smith nor the names of his contributors may be used to endorse |
 26// | or promote products derived from this software without specific prior|
 27// | written permission.                                                  |
 28// |                                                                      |
 29// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  |
 30// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT    |
 31// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    |
 32// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE      |
 33// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          |
 34// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
 35// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
 36// |  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED  |
 37// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT          |
 38// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
 39// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          |
 40// | POSSIBILITY OF SUCH DAMAGE.                                          |
 41// +----------------------------------------------------------------------+
 42// | Author: Lukas Smith <smith@pooteeweet.org>                           |
 43// +----------------------------------------------------------------------+
 44//
 45// $Id: LOB.php,v 1.34 2006/10/25 11:52:21 lsmith Exp $
 46
 47/**
 48 * @package  MDB2
 49 * @category Database
 50 * @author   Lukas Smith <smith@pooteeweet.org>
 51 */
 52
 53require_once 'MDB2.php';
 54
 55/**
 56 * MDB2_LOB: user land stream wrapper implementation for LOB support
 57 *
 58 * @package MDB2
 59 * @category Database
 60 * @author Lukas Smith <smith@pooteeweet.org>
 61 */
 62class MDB2_LOB
 63{
 64    /**
 65     * contains the key to the global MDB2 instance array of the associated
 66     * MDB2 instance
 67     *
 68     * @var integer
 69     * @access protected
 70     */
 71    var $db_index;
 72
 73    /**
 74     * contains the key to the global MDB2_LOB instance array of the associated
 75     * MDB2_LOB instance
 76     *
 77     * @var integer
 78     * @access protected
 79     */
 80    var $lob_index;
 81
 82    // {{{ stream_open()
 83
 84    /**
 85     * open stream
 86     *
 87     * @param string specifies the URL that was passed to fopen()
 88     * @param string the mode used to open the file
 89     * @param int holds additional flags set by the streams API
 90     * @param string not used
 91     *
 92     * @return bool
 93     * @access public
 94     */
 95    function stream_open($path, $mode, $options, &$opened_path)
 96    {
 97        if (!preg_match('/^rb?\+?$/', $mode)) {
 98            return false;
 99        }
100        $url = parse_url($path);
101        if (empty($url['host'])) {
102            return false;
103        }
104        $this->db_index = (int)$url['host'];
105        if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
106            return false;
107        }
108        $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
109        $this->lob_index = (int)$url['user'];
110        if (!isset($db->datatype->lobs[$this->lob_index])) {
111            return false;
112        }
113        return true;
114    }
115    // }}}
116
117    // {{{ stream_read()
118
119    /**
120     * read stream
121     *
122     * @param int number of bytes to read
123     *
124     * @return string
125     * @access public
126     */
127    function stream_read($count)
128    {
129        if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
130            $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
131            $db->datatype->_retrieveLOB($db->datatype->lobs[$this->lob_index]);
132
133            $data = $db->datatype->_readLOB($db->datatype->lobs[$this->lob_index], $count);
134            $length = strlen($data);
135            if ($length == 0) {
136                $db->datatype->lobs[$this->lob_index]['endOfLOB'] = true;
137            }
138            $db->datatype->lobs[$this->lob_index]['position'] += $length;
139            return $data;
140        }
141    }
142    // }}}
143
144    // {{{ stream_write()
145
146    /**
147     * write stream, note implemented
148     *
149     * @param string data
150     *
151     * @return int
152     * @access public
153     */
154    function stream_write($data)
155    {
156        return 0;
157    }
158    // }}}
159
160    // {{{ stream_tell()
161
162    /**
163     * return the current position
164     *
165     * @return int current position
166     * @access public
167     */
168    function stream_tell()
169    {
170        if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
171            $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
172            return $db->datatype->lobs[$this->lob_index]['position'];
173        }
174    }
175    // }}}
176
177    // {{{ stream_eof()
178
179    /**
180     * Check if stream reaches EOF
181     *
182     * @return bool
183     * @access public
184     */
185    function stream_eof()
186    {
187        if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
188            return true;
189        }
190
191        $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
192        $result = $db->datatype->_endOfLOB($db->datatype->lobs[$this->lob_index]);
193        if (version_compare(phpversion(), "5.0", ">=")
194            && version_compare(phpversion(), "5.1", "<")
195        ) {
196            return !$result;
197        }
198        return $result;
199    }
200    // }}}
201
202    // {{{ stream_seek()
203
204    /**
205     * Seek stream, not implemented
206     *
207     * @param int offset
208     * @param int whence
209     *
210     * @return bool
211     * @access public
212     */
213    function stream_seek($offset, $whence)
214    {
215        return false;
216    }
217    // }}}
218
219    // {{{ stream_stat()
220
221    /**
222     * return information about stream
223     *
224     * @access public
225     */
226    function stream_stat()
227    {
228        if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
229            $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
230            return array(
231              'db_index' => $this->db_index,
232              'lob_index' => $this->lob_index,
233            );
234        }
235    }
236    // }}}
237
238    // {{{ stream_close()
239
240    /**
241     * close stream
242     *
243     * @access public
244     */
245    function stream_close()
246    {
247        if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
248            $db =& $GLOBALS['_MDB2_databases'][$this->db_index];
249            if (isset($db->datatype->lobs[$this->lob_index])) {
250                $db->datatype->_destroyLOB($db->datatype->lobs[$this->lob_index]);
251                unset($db->datatype->lobs[$this->lob_index]);
252            }
253        }
254    }
255    // }}}
256}
257
258// register streams wrapper
259if (!stream_wrapper_register("MDB2LOB", "MDB2_LOB")) {
260    MDB2::raiseError();
261    return false;
262}
263
264?>