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<?php

/*************************

  Coppermine Photo Gallery

  ************************

  Copyright (c) 2003-2005 Coppermine Dev Team

  v1.1 originaly written by Gregory DEMAR

  This program is free software; you can redistribute it and/or modify

  it under the terms of the GNU General Public License as published by

  the Free Software Foundation; either version 2 of the License, or

  (at your option) any later version.

  ********************************************

  Coppermine version: 1.3.3

  $Source: /cvsroot/coppermine/stable/include/sql_parse.php,v $

  $Revision: 1.6 $

  $Author: gaugau $

  $Date: 2005/04/19 03:17:11 $

**********************************************/

/**

 * sql_parse.php

 *                               -------------------

 *      begin                : Thu May 31, 2001

 *      copyright            : (C) 2001 The phpBB Group

 *      email                : support@phpbb.com

 *

 *      $Id: sql_parse.php,v 1.6 2005/04/19 03:17:11 gaugau Exp $

 */

/**

 * This program is free software; you can redistribute it and/or modify

 *    it under the terms of the GNU General Public License as published by

 *    the Free Software Foundation; either version 2 of the License, or

 *    (at your option) any later version.

 */

/**

 * These functions are mainly for use in the db_utilities under the admin

 *         however in order to make these functions available elsewhere, specifically

 *         in the installation phase of phpBB I have seperated out a couple of

 *         functions into this file.  JLH

 *

 * \**************************************************************************

 */

// remove_comments will strip the sql comment lines out of an uploaded sql file

// specifically for mssql and postgres type files in the install....

function remove_comments(&$output)

{

    $lines = explode("\n", $output);

    $output = "";

    // try to keep mem. use down

    $linecount = count($lines);

    $in_comment = false;

    for($i = 0; $i < $linecount; $i++) {

        if (preg_match("/^\/\*/", preg_quote($lines[$i]))) {

            $in_comment = true;

        }

        if (!$in_comment) {

            $output .= $lines[$i] . "\n";

        }

        if (preg_match("/\*\/$/", preg_quote($lines[$i]))) {

            $in_comment = false;

        }

    }

    unset($lines);

    return $output;

}

// remove_remarks will strip the sql comment lines out of an uploaded sql file

function remove_remarks($sql)

{

    $lines = explode("\n", $sql);

    // try to keep mem. use down

    $sql = "";

    $linecount = count($lines);

    $output = "";

    for ($i = 0; $i < $linecount; $i++) {

        if (($i != ($linecount - 1)) || (strlen($lines[$i]) > 0)) {

            if ($lines[$i][0] != "#") {

                $output .= $lines[$i] . "\n";

            } else {

                $output .= "\n";

            }

            // Trading a bit of speed for lower mem. use here.

            $lines[$i] = "";

        }

    }

    return $output;

}

// split_sql_file will split an uploaded sql file into single sql statements.

// Note: expects trim() to have already been run on $sql.

function split_sql_file($sql, $delimiter)

{

    // Split up our string into "possible" SQL statements.

    $tokens = explode($delimiter, $sql);

    // try to save mem.

    $sql = "";

    $output = array();

    // we don't actually care about the matches preg gives us.

    $matches = array();

    // this is faster than calling count($oktens) every time thru the loop.

    $token_count = count($tokens);

    for ($i = 0; $i < $token_count; $i++) {

        // Don't wanna add an empty string as the last thing in the array.

        if (($i != ($token_count - 1)) || (strlen($tokens[$i] > 0))) {

            // This is the total number of single quotes in the token.

            $total_quotes = preg_match_all("/'/", $tokens[$i], $matches);

            // Counts single quotes that are preceded by an odd number of backslashes,

            // which means they're escaped quotes.

            $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$i], $matches);

            $unescaped_quotes = $total_quotes - $escaped_quotes;

            // If the number of unescaped quotes is even, then the delimiter did NOT occur inside a string literal.

            if (($unescaped_quotes % 2) == 0) {

                // It's a complete sql statement.

                $output[] = $tokens[$i];

                // save memory.

                $tokens[$i] = "";

            } else {

                // incomplete sql statement. keep adding tokens until we have a complete one.

                // $temp will hold what we have so far.

                $temp = $tokens[$i] . $delimiter;

                // save memory..

                $tokens[$i] = "";

                // Do we have a complete statement yet?

                $complete_stmt = false;

                for ($j = $i + 1; (!$complete_stmt && ($j < $token_count)); $j++) {

                    // This is the total number of single quotes in the token.

                    $total_quotes = preg_match_all("/'/", $tokens[$j], $matches);

                    // Counts single quotes that are preceded by an odd number of backslashes,

                    // which means they're escaped quotes.

                    $escaped_quotes = preg_match_all("/(?<!\\\\)(\\\\\\\\)*\\\\'/", $tokens[$j], $matches);

                    $unescaped_quotes = $total_quotes - $escaped_quotes;

                    if (($unescaped_quotes % 2) == 1) {

                        // odd number of unescaped quotes. In combination with the previous incomplete

                        // statement(s), we now have a complete statement. (2 odds always make an even)

                        $output[] = $temp . $tokens[$j];

                        // save memory.

                        $tokens[$j] = "";

                        $temp = "";

                        // exit the loop.

                        $complete_stmt = true;

                        // make sure the outer loop continues at the right point.

                        $i = $j;

                    } else {

                        // even number of unescaped quotes. We still don't have a complete statement.

                        // (1 odd and 1 even always make an odd)

                        $temp .= $tokens[$j] . $delimiter;

                        // save memory.

                        $tokens[$j] = "";

                    }

                } // for..

            } // else

        }

    }

    return $output;

}

?>