265 lines
8.1 KiB
PHP
265 lines
8.1 KiB
PHP
<?php
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// +----------------------------------------------------------------------+
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// | PHP version 5 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1998-2006 Manuel Lemos, Tomas V.V.Cox, |
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// | Stig. S. Bakken, Lukas Smith |
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// | All rights reserved. |
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// +----------------------------------------------------------------------+
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// | MDB2 is a merge of PEAR DB and Metabases that provides a unified DB |
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// | API as well as database abstraction for PHP applications. |
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// | This LICENSE is in the BSD license style. |
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// | |
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// | Redistribution and use in source and binary forms, with or without |
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// | modification, are permitted provided that the following conditions |
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// | are met: |
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// | |
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// | Redistributions of source code must retain the above copyright |
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// | notice, this list of conditions and the following disclaimer. |
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// | |
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// | Redistributions in binary form must reproduce the above copyright |
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// | notice, this list of conditions and the following disclaimer in the |
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// | documentation and/or other materials provided with the distribution. |
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// | |
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// | Neither the name of Manuel Lemos, Tomas V.V.Cox, Stig. S. Bakken, |
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// | Lukas Smith nor the names of his contributors may be used to endorse |
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// | or promote products derived from this software without specific prior|
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// | written permission. |
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// | |
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// | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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// | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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// | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
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// | FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
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// | REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
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// | INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, |
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// | BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS|
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// | OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
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// | AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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// | LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY|
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// | WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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// | POSSIBILITY OF SUCH DAMAGE. |
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// +----------------------------------------------------------------------+
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// | Author: Lukas Smith <smith@pooteeweet.org> |
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// +----------------------------------------------------------------------+
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//
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// $Id: LOB.php,v 1.34 2006/10/25 11:52:21 lsmith Exp $
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/**
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* @package MDB2
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* @category Database
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* @author Lukas Smith <smith@pooteeweet.org>
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*/
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require_once('MDB2.php');
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/**
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* MDB2_LOB: user land stream wrapper implementation for LOB support
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*
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* @package MDB2
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* @category Database
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* @author Lukas Smith <smith@pooteeweet.org>
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*/
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class MDB2_LOB
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{
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/**
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* contains the key to the global MDB2 instance array of the associated
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* MDB2 instance
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*
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* @var integer
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* @access protected
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*/
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var $db_index;
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/**
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* contains the key to the global MDB2_LOB instance array of the associated
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* MDB2_LOB instance
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*
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* @var integer
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* @access protected
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*/
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var $lob_index;
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// {{{ stream_open()
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/**
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* open stream
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*
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* @param string specifies the URL that was passed to fopen()
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* @param string the mode used to open the file
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* @param int holds additional flags set by the streams API
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* @param string not used
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*
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* @return bool
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* @access public
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*/
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function stream_open($path, $mode, $options, &$opened_path)
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{
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if (!preg_match('/^rb?\+?$/', $mode)) {
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return false;
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}
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$url = parse_url($path);
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if (empty($url['host'])) {
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return false;
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}
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$this->db_index = (int)$url['host'];
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if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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return false;
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}
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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$this->lob_index = (int)$url['user'];
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if (!isset($db->datatype->lobs[$this->lob_index])) {
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return false;
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}
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return true;
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}
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// }}}
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// {{{ stream_read()
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/**
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* read stream
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*
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* @param int number of bytes to read
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*
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* @return string
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* @access public
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*/
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function stream_read($count)
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{
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if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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$db->datatype->_retrieveLOB($db->datatype->lobs[$this->lob_index]);
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$data = $db->datatype->_readLOB($db->datatype->lobs[$this->lob_index], $count);
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$length = strlen($data);
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if ($length == 0) {
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$db->datatype->lobs[$this->lob_index]['endOfLOB'] = true;
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}
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$db->datatype->lobs[$this->lob_index]['position'] += $length;
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return $data;
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}
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}
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// }}}
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// {{{ stream_write()
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/**
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* write stream, note implemented
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*
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* @param string data
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*
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* @return int
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* @access public
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*/
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function stream_write($data)
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{
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return 0;
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}
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// }}}
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// {{{ stream_tell()
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/**
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* return the current position
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*
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* @return int current position
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* @access public
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*/
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function stream_tell()
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{
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if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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return $db->datatype->lobs[$this->lob_index]['position'];
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}
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}
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// }}}
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// {{{ stream_eof()
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/**
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* Check if stream reaches EOF
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*
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* @return bool
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* @access public
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*/
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function stream_eof()
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{
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if (!isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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return true;
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}
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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$result = $db->datatype->_endOfLOB($db->datatype->lobs[$this->lob_index]);
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if (version_compare(phpversion(), "5.0", ">=")
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&& version_compare(phpversion(), "5.1", "<")
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) {
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return !$result;
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}
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return $result;
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}
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// }}}
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// {{{ stream_seek()
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/**
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* Seek stream, not implemented
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*
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* @param int offset
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* @param int whence
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*
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* @return bool
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* @access public
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*/
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function stream_seek($offset, $whence)
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{
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return false;
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}
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// }}}
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// {{{ stream_stat()
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/**
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* return information about stream
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*
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* @access public
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*/
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function stream_stat()
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{
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if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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return array(
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'db_index' => $this->db_index,
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'lob_index' => $this->lob_index,
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);
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}
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}
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// }}}
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// {{{ stream_close()
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/**
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* close stream
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*
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* @access public
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*/
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function stream_close()
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{
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if (isset($GLOBALS['_MDB2_databases'][$this->db_index])) {
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$db =& $GLOBALS['_MDB2_databases'][$this->db_index];
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if (isset($db->datatype->lobs[$this->lob_index])) {
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$db->datatype->_destroyLOB($db->datatype->lobs[$this->lob_index]);
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unset($db->datatype->lobs[$this->lob_index]);
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}
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}
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}
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// }}}
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}
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// register streams wrapper
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if (!stream_wrapper_register("MDB2LOB", "MDB2_LOB")) {
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MDB2::raiseError();
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return false;
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}
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?>
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