<?php
/*************************
  Coppermine Photo Gallery
  ************************
  Copyright (c) 2003-2010 Coppermine Dev Team
  v1.0 originally 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 version 3
  as published by the Free Software Foundation.
  
  ********************************************
  Coppermine version: 1.5.3
  $HeadURL: https://coppermine.svn.sourceforge.net/svnroot/coppermine/trunk/cpg1.5.x/include/sql_parse.php $
  $Revision: 6985 $
  $LastChangedBy: gaugau $
  $Date: 2010-01-02 11:38:29 +0100 (Sa, 02. Jan 2010) $
**********************************************/

/**
 * sql_parse.php
 *                               -------------------
 *      begin                : Thu May 31, 2001
 *      copyright            : (C) 2001 The phpBB Group
 *      email                : support@phpbb.com
 *
 *      $Id: sql_parse.php 6985 2010-01-02 10:38:29Z gaugau $
 */

/**
 * This program is free software; you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License version 3
 *    as published by the Free Software Foundation.
 *    
 */

/**
 * 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[$i]) > 0)) {
            if (isset($lines[$i][0]) && $lines[$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;
}

?>
