source: branches/version-2_5-dev/data/module/MDB2/LOB.php @ 20119

Revision 20119, 8.1 KB checked in by nanasess, 12 years ago (diff)

module 以下は svn:keywords を除外

  • Property svn:eol-style set to LF
  • Property svn:mime-type set to text/x-httpd-php; charset=UTF-8
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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?>
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